JP2016147701A - Bag formed of receiving part with fluid filled therein and its manufacturing method as well as bag with fluid filled in receiving part and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag that can improve take-out properties of fluid and is superior in filling suitability.SOLUTION: An upper edge of a bag partially contains at least a folded-back portion formed by folding back a laminated film constituting at least a portion of a surface film and at least a portion of a back film. Also, a take-out opening part passing when the fluid made to flow along the folded-back portion of the upper edge is extracted outside is formed in the surface film and the back film. Also, the opening part for penetrating through the surface film is at least partially formed in a position inside more than a seal part for defining a receiving part in at least the surface film of the bag. Also, a closure film is attached in the inner surface of the surface film so as to be overlapped partially at least in the opening part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bag in which a container filled with a fluid is formed and a method for manufacturing the same. Moreover, this invention relates to the bag with which the accommodating part was filled with the fluid, and its manufacturing method.

  A bag made of a flexible packaging material is used as a bag for containing a fluid having fluidity such as liquid or powder, or a fluid containing a solid such as confectionery. A bag for containing a fluid generally forms a seal portion such as a side edge seal portion or a lower edge seal portion by heat-welding a front film and a back film each having an inner surface made of a thermoplastic resin layer. Can be obtained. At this time, normally, the front film and the back film are not thermally welded at the upper part of the bag, thereby forming an opening at the upper part of the bag. Next, the fluid is filled into the bag through the opening. Thereafter, the front film and the back film are again heat-welded to each other at the upper portion of the bag, thereby forming an upper edge seal portion at the upper portion of the bag, thereby sealing the bag. In this way, a bag filled with the fluid is obtained.

  Patent Document 1 discloses an example of this type of bag. In the bag disclosed in Patent Document 1, a side edge seal portion and a lower edge seal portion are formed by thermally welding a front surface film and a back surface film, thereby defining an accommodating portion filled with a fluid. The In this bag, an outlet portion is formed at an upper corner portion of the bag. The outlet portion is a portion that is provided for adjusting the flow of the fluid when the fluid is taken out of the bag, and has a narrower width than the accommodating portion. In Patent Document 1, the flow path of the fluid in the outlet portion is formed between a pair of seal portions extending along the direction of fluid extraction. Further, in Patent Document 1, the outlet for taking out the fluid to the outside is to break a part of the outlet part extending along the extraction direction along the planned opening portion extending in a direction substantially perpendicular to the extraction direction. Formed by.

  Such an outlet portion is generally formed integrally with the housing portion from the same flexible packaging material as the front film and the back film. When taking out the fluid, the gap between the front film and the back film is widened by the pressure from the fluid, so that the fluid passage in the outlet is secured. Further, the presence of the fluid in the outlet portion increases the rigidity of the outlet portion when the fluid is taken out. Therefore, at the time of taking out, it is important to form the take-out port so that the space between the front film and the back film is widened by the pressure from the fluid and the widened state is maintained. For example, in Patent Document 1, an embossed portion extending in the direction of taking out the fluid is provided on the surface film and the back film constituting the take-out portion, thereby increasing the rigidity of each film. The state in which the interval of is wide is maintained stably. This prevents the outlet from closing when the fluid is taken out.

Japanese Patent No. 4875611

  However, in Patent Document 1, as described above, the flow path of the fluid in the outlet is formed between a pair of seal portions that extend along the direction in which the fluid is extracted. This means that the surface film and the back film are in close contact with both sides of the flow path of the fluid in the outlet, and therefore the space between the surface film and the back film in the flow path is sufficiently widened. Means that it is still not easy. That is, the flow path of the fluid in the outlet portion cannot be secured sufficiently large, and the amount of the fluid located in the outlet portion is small when the fluid is taken out, so that the rigidity of the outlet portion is sufficiently It means that it is difficult to secure. Therefore, there is room for improvement in the extractability.

  Moreover, in the bag of patent document 1, in order to close an opening part, after filling the inside of a bag through the opening part of the upper part of a bag, the upper part of a bag is heat-welded and an upper edge seal part is attached. Form. By the way, when taking out the fluid filled in the container, as one of the flow paths of the fluid, first move from the container to the top of the bag and then along the upper edge of the bag toward the outlet It is possible to consider a flow path that moves and then takes out from the outlet of the outlet. On the other hand, when the upper edge of the bag is constituted by the upper edge seal portion, that is, when the surface film and the back film are in close contact with each other at the upper edge of the bag, the surface film and the back surface in the region inside the upper edge seal portion It is thought that the distance between the film is narrowed. This means that the flow path of the fluid from the upper part of the bag to the outlet is reduced, and the amount of the fluid that can be stored in the upper part of the bag is reduced. That is, it means that the flow rate of the fluid flowing into the outlet portion cannot be secured sufficiently high, and therefore the rigidity of the outlet portion is not sufficiently secured. Therefore, there is a possibility of adversely affecting the removal of the fluid from the outlet portion.

  Further, when the outlet portion and the upper edge seal portion are formed in the upper portion of the bag as in the bag of Patent Document 1, the length of the outlet portion is sufficiently increased, thereby providing a fluid rectifying function. If sufficient securing is desired, the size of the upper edge seal portion is reduced accordingly. This means that the size of the opening used when filling the accommodating portion with the fluid is reduced, and as a result, the efficiency of the fluid filling operation is reduced.

  The present invention has been made in consideration of such problems, and an object of the present invention is to provide a bag that can improve the fluid take-out property and is excellent in filling suitability.

  1st this invention is a bag in which the accommodating part with which a fluid is filled was formed, Comprising: At least a surface film and a back film are provided, The outer edge of the said bag is the lower edge facing the upper edge and the said upper edge And a pair of side edges extending between the upper edge and the lower edge, wherein the upper edge constitutes at least a part of the surface film and at least a part of the back film. A folded portion formed by folding the film is at least partially included, and the surface film and the back film pass when the fluid flowing along the folded portion of the upper edge is taken out to the outside. An outlet portion is formed, and the storage portion is formed between the inner surface of the front film and the inner surface of the back film by thermal welding along the lower edge and the pair of side edges of the bag. The opening portion penetrating the surface film is defined at least on the surface film of the surface film and the back film than the seal portion defining the accommodating portion. At least partially formed at an inner position, the bag further comprising a closing member attached to the inner surface of the surface film so as to at least partially overlap the opening; A first layer facing the surface film and a second surface located on the opposite side of the first surface, wherein the first layer constituting the first surface of the closing member is at least partially The bag is made of a material that can be thermally welded to the inner surface of the surface film.

  According to the first aspect of the present invention, in the bag in which the accommodating portion filled with the fluid is formed, the second layer constituting the second surface of the closing member constitutes the first layer of the closing member. You may be comprised with the material which has higher melting | fusing point than the material to do. Alternatively, the second surface of the closing member may be provided with an inhibitor that inhibits thermal welding from occurring with the inner surface of the back film.

  2nd this invention is a bag in which the accommodating part with which a fluid is filled was formed, Comprising: At least a surface film and a back film are provided, The outer edge of the said bag is the lower edge facing the upper edge and the said upper edge And a pair of side edges extending between the upper edge and the lower edge, wherein the upper edge constitutes at least a part of the surface film and at least a part of the back film. A folded portion formed by folding the film is at least partially included, and the surface film and the back film pass when the fluid flowing along the folded portion of the upper edge is taken out to the outside. An outlet portion is formed, and the surface film includes at least a first portion and a second portion adjacent to each other with an opening penetrating the surface film interposed therebetween. The second portion has a contact state in which the inner surface of the first portion and the inner surface of the second portion are in partial contact, and a gap is formed between the inner surface of the first portion and the inner surface of the second portion. It is the bag comprised so that it can take the open state made.

  In the bag according to the present invention in which the accommodating portion filled with the fluid is formed, the folded portion of the upper edge may be formed in an arc shape.

  According to the present invention, in the bag in which the accommodating portion filled with the fluid is formed, the distance from the lower edge to the upper edge is from one side edge of the pair of side edges to the other side edge. Accordingly, the outlet portion may be formed on the one side edge side of the pair of side edges of the front film and the back film.

  According to the present invention, in the bag in which the accommodating portion filled with the fluid is formed, the opening portion is formed with a scheduled opening portion that becomes an outlet when being opened, along the folded portion. The fluidized fluid may be removed from the outlet.

  According to the present invention, in the bag in which the accommodating portion filled with the fluid is formed, the opening is formed in the surface film so as to reach from one side edge of the pair of side edges to the other side edge. The upper edge may extend substantially parallel to the opening.

  The present invention is a method of manufacturing a bag in which a container filled with a fluid is formed, wherein the container is formed on the inner surface of the surface film by thermal welding along a lower edge and a pair of side edges of the bag. The bag manufacturing method is defined inside a seal portion formed between the inner surface of the back film and the step of preparing a laminated film including a thermoplastic resin layer constituting the inner surface and a base material layer; The folded film is folded to form a folded portion, and at least a part of the surface film and at least a part of the back film formed integrally with at least a part of the surface film via the folded portion And a step of attaching a closing member to the inner surface of the surface film, and a step of forming the seal portion to define the housing portion, before the seal portion is formed. Of the surface film and the back film, at least the surface film is formed with an opening that penetrates the surface film, and the closing member of the surface film is at least partially overlapped with the opening. The closing member is attached to the inner surface, and the closing member includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface, and the closing member includes the first surface. The 1st layer which comprises 1 surface is the manufacturing method of a bag currently comprised by the material which can be heat-welded at the said inner surface of the said surface film at least partially.

  The present invention is a bag in which a container is filled with a fluid, and includes at least a front film and a back film, and an outer edge of the bag includes an upper edge, a lower edge facing the upper edge, and the upper edge. And a pair of side edges extending between the lower edge, and the upper edge is formed by folding back a laminated film constituting at least a part of the surface film and at least a part of the back film. The surface film and the back film are formed with an outlet portion through which the fluid flowing along the folded portion of the upper edge is taken out to the outside. The accommodating portion is a seal portion formed between the inner surface of the surface film and the inner surface of the back film by heat welding along the lower edge and the pair of side edges of the bag. Each of the surface film and the back film includes a base material layer, and a thermoplastic resin layer provided on the base material layer and constituting the inner surface of the surface film, Of the film and the back film, at least the surface film has an opening formed at a position inside the seal portion that defines the housing portion, and at least the base material in the opening. The bag is further divided, and the bag further comprises a closing member attached to the inner surface of the surface film so as to at least partially overlap the opening, the closing member facing the surface film A first surface and a second surface located on the opposite side of the first surface, and a heat melt is provided between the first surface of the closing member and the inner surface of the surface film. The opening is formed at least partially by the seal between the first surface of the closing member and the inner surface of the surface film, or of the closing member. A bag surrounded by a combination of the seal portion between the first surface and the inner surface of the surface film and the seal portion between the inner surface of the surface film and the inner surface of the back film.

  The present invention is a method of manufacturing a bag in which a container is filled with a fluid, the step of preparing the bag according to the first invention described above, and the fluid in the container through the opening. A filling step for filling, and a closing step for forming a seal portion by at least partially heat-sealing the first surface of the closing member and the inner surface of the surface film, the closing step comprising: An opening is formed by a seal portion formed by heat welding between the first surface of the closing member and the inner surface of the surface film, or the first surface and the surface of the closing member. By a combination of a seal portion formed by heat welding between the inner surface of the film and a seal portion formed by heat welding between the inner surface of the front film and the inner surface of the back film. , So as to be enclosed is carried out, a method of manufacturing a bag.

  The present invention is a method for manufacturing a bag in which a container is filled with a fluid, and a preparation step of preparing a bag in which an opening is formed, and the container is filled with a fluid through the opening. A filling step and a closing step for closing the opening, wherein the accommodating portion is formed between the inner surface of the front film and the inner surface of the back film by heat welding along the lower edge and a pair of side edges of the bag. The preparatory step is a step of preparing a laminated film including a thermoplastic resin layer constituting an inner surface and a base material layer, and a folded portion by folding the laminated film. A folding step of obtaining at least a part of the surface film and at least a part of the back film integrally formed with at least a part of the surface film via the folding part, Surface fi Attaching a closing member to the inner surface of the film, and forming the seal portion to define the housing portion, and at least of the front film and the back film formed with the seal portion The surface film is formed with an opening that penetrates the surface film, and the closing member is attached to the inner surface of the surface film so as to at least partially overlap the opening, and the closure The member for use includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface, and the first layer constituting the first surface of the closing member is: At least partially, it is comprised by the material which can be heat-welded to the said inner surface of the said surface film, The said closing part is the said 1st surface of the said member for closure, and the said surface fill. A seal formed by thermally welding the inner surface of the sealing member, or a seal formed by thermally welding the first surface of the closing member and the inner surface of the surface film. The bag manufacturing method is carried out so as to be surrounded by a combination of a seal portion formed by heat-welding between the inner surface and the inner surface of the front film and the inner surface of the back film.

  The present invention is a method of manufacturing a bag in which a container filled with a fluid is formed, wherein the container is formed on the inner surface of the surface film by thermal welding along a lower edge and a pair of side edges of the bag. The bag manufacturing method is defined inside a seal portion formed between the inner surface of the back film and the step of preparing a laminated film including a thermoplastic resin layer constituting the inner surface and a base material layer; The folded film is folded to form a folded portion, and at least a part of the surface film and at least a part of the back film formed integrally with at least a part of the surface film via the folded portion And a step of forming the seal portion to define the accommodating portion, and the surface film is adjacent to the first portion adjacent to the opening that penetrates the surface film. Yo At least a second portion, wherein the first portion and the second portion are in a contact state in which the inner surface of the first portion and the inner surface of the second portion are in partial contact, and the inner surface of the first portion It is a bag comprised so that it can take the opening state in which a clearance gap is formed between the inner surfaces of the said 2nd part.

  The present invention is a bag in which a container is filled with a fluid, and includes at least a front film and a back film, and an outer edge of the bag includes an upper edge, a lower edge facing the upper edge, and the upper edge. And a pair of side edges extending between the lower edge, and the upper edge is formed by folding back a laminated film constituting at least a part of the surface film and at least a part of the back film. The surface film and the back film are formed with an outlet portion through which the fluid flowing along the folded portion of the upper edge is taken out to the outside. The front film and the back film each include a base material layer, and a thermoplastic resin layer provided on the base material layer and constituting the inner surface of the front film. The surface film includes at least a first portion and a second portion that are adjacent to each other with an opening interposed therebetween, and at least the base material layer is divided in the opening, and the inner surface of the first portion and the second portion Between the inner surfaces of the parts, there is a bag in which a sealing part for closing is formed by heat welding.

  The present invention is a method of manufacturing a bag in which a container is filled with a fluid, the step of preparing the bag according to the second invention described above, and the fluid in the container through the opening. A bag manufacturing method comprising: a filling step of filling, and a closing step of thermally welding the inner surface of the first portion and the inner surface of the second portion of the surface film to form a sealing portion for closing. is there.

  The present invention is a method for manufacturing a bag in which a container is filled with a fluid, and a preparation step of preparing a bag in which an opening is formed, and the container is filled with a fluid through the opening. A filling step and a closing step for closing the opening, wherein the accommodating portion is formed between the inner surface of the front film and the inner surface of the back film by heat welding along the lower edge and a pair of side edges of the bag. The preparatory step is a step of preparing a laminated film including a thermoplastic resin layer constituting an inner surface and a base material layer, and a folded portion by folding the laminated film. A folding step of obtaining at least a part of the surface film and at least a part of the back film integrally formed with at least a part of the surface film via the folding part, Seal part And forming the accommodating portion, and the surface film includes at least a first portion and a second portion adjacent to each other with an opening penetrating the surface film, and in the closing step A bag manufacturing method in which a sealing part for closing is formed by heat-welding the inner surface of the first part and the inner surface of the second part of the surface film.

  In the first and second aspects of the present invention, the upper edge of the bag is at least partially a folded portion formed by folding a laminated film constituting at least a part of the front film and at least a part of the back film. Is included. For this reason, the space | interval of a surface film and a back film can be maintained widely compared with the case where the upper edge of a bag is formed of the seal part. Further, the front film and the back film are formed with an outlet portion through which the fluid that has flowed along the folded portion of the upper edge is taken out. Therefore, according to this invention, the flow path of the fluid in the upper edge of a bag can be ensured widely. For this reason, when the bag is tilted, the fluid that has reached the upper edge of the bag from the accommodating portion can be smoothly guided toward the outlet portion. In addition, by increasing the length of the upper edge of the bag constituted by the folded portion, a sufficient amount of fluid can be stored along the upper edge of the bag. For this reason, the extractability of a fluid can be improved.

  In the first aspect of the present invention, at least a surface film of the bag has an opening penetrating the surface film at least partially at a position inside a seal portion that defines the housing portion. For this reason, a fluid can be filled in the accommodating part of a bag via the opening part formed in the surface film. A closing film is attached to the inner surface of the surface film so as to at least partially overlap the opening. For this reason, after filling the accommodating part of a bag with a fluid, the opening part formed in the surface film can be closed by heat-welding the closing film to the inner surface of the surface film. Therefore, even when the upper edge of the bag includes a folded portion, it is possible to ensure a wide opening width during filling. By these things, the bag which is provided with the high pick_out | removing property of a fluid and is excellent in the filling property of a fluid can be provided.

  Moreover, in 2nd this invention, the surface film contains the 1st part and 2nd part which adjoin through the opening part which penetrates a surface film. Further, the first part and the second part of the surface film are in a contact state in which the inner surface of the first part and the inner surface of the second part are in partial contact, and the inner surface of the first part and the inner surface of the second part. It is comprised so that the opening state in which a clearance gap is formed can be taken. For this reason, a fluid can be filled in the accommodating part of a bag via the opening part formed in the surface film. Moreover, after filling the accommodating part of a bag with a fluid, an opening part can be closed by heat-welding the inner surface of the 1st part of a surface film, and the inner surface of a 2nd part. By these things, the bag which is provided with the high pick_out | removing property of a fluid and is excellent in the filling property of a fluid can be provided.

FIG. 1 is a perspective view showing a bag according to an embodiment of the first invention. FIG. 2A is a front view of the bag shown in FIG. 1. FIG. 2B is a cross-sectional view showing the bag shown in FIG. 2A viewed along the line IIB-IIB. FIG. 3 is an exploded view of members constituting the bag shown in FIG. 1. FIG. 4 is a cross-sectional view illustrating an example of a layer configuration of a surface film, a back film, and a bottom film. FIG. 5 is a cross-sectional view showing an example of a layer structure of the closing film. FIG. 6 is a cross-sectional view showing the bag shown in FIG. 2A when viewed along the line VI-VI. FIG. 7 is a cross-sectional view showing the bag shown in FIG. 2A as viewed along the line VII-VII. FIG. 8 is a perspective view showing a process of preparing a long laminated film, a bottom film, and a closing film for manufacturing a bag. FIG. 9A is a perspective view illustrating a folding step of folding a long laminated film to form a folded portion to obtain a long surface film and a back film. FIG. 9B is a cross-sectional view showing a case where each film shown in FIG. 9A is cut along a direction orthogonal to the film conveyance direction. FIG. 10 is a cross-sectional view showing a process of attaching a long closing film to a long surface film. FIG. 11 is a cross-sectional view illustrating a process of obtaining a long first portion and a second portion by dividing a long surface film. FIG. 12 is a plan view showing a process of forming a housing portion by thermally welding a long surface film and a back film. FIG. 13 is a plan view showing a process of cutting the long films heat-welded with each other along the shape of the outer edge of the bag. FIG. 14 is a cross-sectional view showing the closing film attached to the surface film so as to overlap the opening. FIG. 15A is a diagram illustrating a filling process in which a container is filled with a fluid through an opening. FIG. 15B is a diagram showing a closing step of closing the opening using a closing film. FIG. 16 is a cross-sectional view showing a bag having an opening in a state of being closed by a closing film. FIG. 17 is a cross-sectional view showing a modified example of a bag provided with an opening in a state of being closed by a closing film. FIG. 18A is a cross-sectional view showing a modified example of a bag having an opening in a state before being closed by a closing film. FIG. 18B is a cross-sectional view showing a state where the opening of the bag shown in FIG. 18A is closed with a closing film. FIG. 19A is a cross-sectional view showing a modification of a bag having an opening in a state before being closed by a closing film. FIG. 19B is a cross-sectional view showing a state where the opening of the bag shown in FIG. 19A is closed with a closing film. FIG. 20 is a front view showing a modification of the opening formed in the surface film of the bag. FIG. 21 is a front view showing a modification of the opening formed in the surface film of the bag. FIG. 22 is a front view showing a modification of the opening formed in the surface film of the bag. FIG. 23 is a front view showing a modification of the opening formed in the surface film of the bag. FIG. 24 is a front view showing a modification of the closing film attached to the inner surface of the surface film of the bag. 25A is an enlarged view of a portion surrounded by a frame XXV in FIG. FIG. 25B is a diagram showing a state in which the opening of the bag shown in FIG. 25A is closed with a closing film. FIG. 26A is a front view showing a modification of the closing film attached to the inner surface of the surface film of the bag. FIG. 26B is a diagram showing a state where the opening of the bag shown in FIG. 26A is closed with a closing film. FIG. 27A is a front view showing a modification of the closing film attached to the inner surface of the surface film of the bag. FIG. 27B is a diagram showing a state in which the opening of the bag shown in FIG. 27A is closed with a closing film. FIG. 28A is a front view showing a modification of the opening formed in the surface film of the bag. FIG. 28B is a diagram showing a state where the opening of the bag shown in FIG. 28A is closed with a closing film. FIG. 29A is a front view showing a modified example of the opening formed on the surface film of the bag and the closing film. FIG. 29B is a diagram showing a state in which the opening of the bag shown in FIG. 29A is closed with a closing film. FIG. 30A is a front view showing a modified example of the opening formed on the surface film of the bag and the closing film. FIG. 30B is a diagram showing an example of a state where the opening of the bag shown in FIG. 30A is closed with a closing film. FIG. 30C is a diagram showing another example of a state where the opening of the bag shown in FIG. 30A is closed with a closing film. FIG. 31 is a perspective view showing an example in which the front film, the back film, and the bottom film are obtained from a single laminated film. FIG. 32 is a perspective view showing an example in which the front film, the back film, and the bottom film are obtained from a single laminated film. FIG. 33 is a perspective view showing a step of preparing a long laminated film, a bottom film and a closing film in the first modification of the bag manufacturing method. FIG. 34 is a cross-sectional view showing a folding step in which a long laminated film is folded to form a folded portion to obtain a long surface film and a back film in the first modification of the bag manufacturing method. FIG. 35 is a cross-sectional view showing a step of attaching a long closure film to a long surface film in the first modification of the bag manufacturing method. FIG. 36 is a cross-sectional view showing a step of obtaining a long first portion and a second portion by dividing a long surface film in a first modification of the bag manufacturing method. FIG. 37 is a plan view showing a plurality of bags assigned to each long film in the first modification of the bag manufacturing method. FIG. 38 is a cross-sectional view showing a folding step in which a long laminated film is folded to form a folded portion to obtain a long surface film and a back film in a second modification of the bag manufacturing method. FIG. 39 is a cross-sectional view showing a process of attaching a long closing film to a long surface film in a second modification of the bag manufacturing method. FIG. 40 is a cross-sectional view showing a step of obtaining a long first portion and a second portion by dividing a long surface film in a second modification of the bag manufacturing method. FIG. 41 is a plan view showing a plurality of bags assigned to each long film in a second modification of the bag manufacturing method. FIG. 42 is a cross-sectional view showing a folding step in which a long laminated film is folded to form a folded portion to obtain a long surface film and a back film in a third modification of the bag manufacturing method. FIG. 43 is a cross-sectional view showing a step of attaching a long closing film to a long surface film in a third modification of the bag manufacturing method. FIG. 44 is a cross-sectional view showing a step of obtaining a long first portion and a second portion by dividing a long surface film in a third modification of the bag manufacturing method. FIG. 45 is a plan view showing a plurality of bags allocated to each long film in a third modification of the bag manufacturing method. FIG. 46 is a front view showing a bag according to an embodiment of the second invention. 47A is a cross-sectional view showing a case where the bag shown in FIG. 46 is viewed along the line XXXXVIIA-XXXXVIIA. 47B is a cross-sectional view showing the bag shown in FIG. 46 as viewed along the line XXXXVIIB-XXXXVIIB. FIG. 48 is a cross-sectional view showing a folding step in which a long laminated film is folded to form a pair of folded portions to obtain a long surface film and a back film in the bag manufacturing method shown in FIG. 46. 49 is a cross-sectional view showing a step of obtaining a long bottom film by pushing one of the pair of folded portions inward in the bag manufacturing method shown in FIG. 46. FIG. FIG. 50 is a manufacturing method of the bag shown in FIG. 46, in which the temporary seal portion between the inner surface of the first portion and the second portion of the surface film is removed, and the inner surface of the first portion and the second portion of the second portion are removed. Sectional drawing which shows the process of forming an opening part between inner surfaces. FIG. 51 is a diagram showing a filling process for filling the container with the fluid through the opening of the bag shown in FIG. 46. FIG. 52 is a cross-sectional view showing the bag in a state in which a closing seal portion is formed between the inner surface of the first portion and the inner surface of the second portion. FIG. 53 is a front view showing the bag in a state where a closing seal portion is formed between the inner surface of the first portion and the inner surface of the second portion. FIG. 54 is an exploded view showing a modified example of members constituting the bag. FIG. 55 is a diagram showing an example of a cross section of a bag made of each member shown in FIG. 54. 56 is a view showing an example of a cross section of a bag made of each member shown in FIG. 54. FIG. FIG. 57 is a front view showing a bag having an opening extending in parallel with the lower edge. FIG. 58 is a front view showing a bag having an opening extending in parallel with the lower edge and an upper edge.

First Embodiment Hereinafter, a first embodiment of the present invention (hereinafter, also referred to as a first embodiment) will be described with reference to FIGS. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, vertical and horizontal dimensional ratios, and the like may be appropriately changed and exaggerated from those of the actual product.

Bag FIG. 1 is a perspective view showing the whole bag 1 according to the first embodiment, and FIG. 2A is a front view showing the whole bag 1 according to the first embodiment. In FIG. 1 and FIG. 2A, the bag 1 of the state before filling with a fluid is shown.

  In the first embodiment, an example in which the bag 1 is of a self-supporting type will be described. For example, in the lower part of the bag 1 shown in FIG. 1, a predetermined space called a gusset M is provided between a surface film 11 and a back film 12 described later. That is, the bag 1 is a so-called bottom gusset bag in which a gusset is formed on the lower edge 23 thereof. In this specification, the terms “lower part”, “lower edge”, “upper part”, “upper edge”, “side part”, “side edge”, and the terms “vertical direction” and “horizontal direction” The position and direction of the bag 1 and its constituent elements are represented with reference to the state where the bag 1 is self-supporting. 2A shows a front view of the bag 1 in a state where the lower film 13 inserted between the front film 11 and the rear film 12 is folded to form the gusset M. FIG.

  The bag 1 includes at least a front film 11 and a back film 12. A seal portion is formed between the inner surface of the front film 11 and the inner surface of the back film 12 by thermal welding along a part of the outer edge of the bag 1. In the first embodiment, the outer edge of the bag 1 is defined by the outer edge of the front film 11 and the outer edge of the back film 12. Therefore, in the first embodiment, the outer edge of the bag 1 coincides with the outer edge of the front film 11 and the outer edge of the back film 12. In the following description, the outer edge of the bag 1 may be referred to as the outer edge of the front film 11 or the outer edge of the back film 12. Moreover, in 1st Embodiment, the surface film 11 means the film located in the surface side of the bag 1 among the laminated | multilayer films which comprise the bag 1. As shown in FIG. Similarly, the back film 12 means a film located on the back side of the bag 1 among the laminated films constituting the bag 1. As described above, the terms “surface film” and “back film” are defined based on the position of the bag 1, and are defined according to the form of a member such as a laminated film constituting the surface film or the back film. Is not to be done.

  As shown in FIGS. 1 and 2A, the outer edge of the bag 1 includes an upper edge 21, a lower edge 23 that faces the upper edge 21, and a pair of side edges 22 that extend between the upper edge 21 and the lower edge 23. , Including. The above-described seal portion includes a lower edge seal portion 23 a formed along the lower edge 23 and a pair of side edge seal portions 22 a formed along the pair of side edges 22. The accommodating part S in which the fluid is accommodated is defined inside the seal parts 22a and 23a. As will be described in detail later, in the first embodiment, the upper edge 21 is constituted by a folded portion 10c formed by folding a laminated film.

  In addition, as long as it can prevent that the accommodating part S communicates with the exterior of the bag 1 through the outer edge of the surface film 11 and the outer edge of the back surface film 12, the width | variety and specific pattern shape of a seal | sticker part are especially limited. I can't. For example, the width of the seal portion may change depending on the position. The direction in which the seal portion extends and the direction in which the outer edge of the front film 11 and the outer edge of the back film 12 extend may be at least partially non-parallel. For example, as shown in FIGS. 1 and 2A, a notch 37 may be formed in the side edge seal portion 22a in order to form an outlet 50 described later.

  Moreover, the seal part which demarcates the accommodating part S filled with the fluid may be a seal part formed by thermally welding the inner surface of the surface film 11 and the inner surface of the back film 12, or the surface The sealing part which couple | bonds the surface film 11 and the back surface film 12 by heat-welding the other film inserted between the film 11 and the back surface film 12 to the surface film 11 or the back surface film 12 may be sufficient. That is, the “seal part formed between the inner surface of the front film 11 and the inner surface of the back film 12” means only the seal part formed by heat welding the inner surface of the front film 11 and the inner surface of the back film 12. In addition, it is a concept including a seal portion formed by thermally welding the film inserted between the inner surface of the front film 11 and the inner surface of the back film 12 and the front film 11 and the back film 12.

  As shown in FIG. 1 and FIG. 2A, the fluid stored in the storage portion S is outside the bag 1 at the position where the upper edge 21 and the one side edge 22 of the front film 11 and the back film 12 intersect. An outlet 50 is formed through which the outlet 50 is taken out. The take-out port 50 is a portion that is provided to adjust the flow of the fluid when the fluid is taken out of the bag 1. The opening portion 50 is formed with a scheduled opening portion 35 that is an opening for taking out the fluid when opened, and the width w of the opening portion 35 is a pair of side edge seal portions 22 a of the bag 1. The interval between is smaller. In the following description, the side edge 22 of the pair of side edges 22 where the outlet 50 is formed is referred to as one side edge 22 and is the side edge 22 that faces the one side edge 22. May be referred to as the other side edge 22. Similarly, the side edge seal portion 22a formed on one side edge 22 is referred to as one side edge seal portion 22a, and the side edge seal portion 22a formed on the other side edge 22 is referred to as the other side edge seal portion 22a. The side edge seal portion 22a may be referred to.

  As long as the width w of the scheduled opening portion 35 of the outlet 50 is smaller than the interval between the pair of side edge seal portions 22a, the specific shape of the outlet 50 is not particularly limited. For example, as shown in FIGS. 1 and 2A, a cutout 37 for adjusting the shape and width w of the outlet 50 may be formed in the side edge seal portion 22a of one side edge 22. For example, the notch 37 is configured such that the distance between the upper edge 21 and the one side edge seal portion 22a becomes narrower toward the position where the upper edge 21 and the one side edge 22 intersect. A region including one side edge seal portion 22a in contact with the cutout 37 configured in this manner and a portion of the upper edge 21 formed of the folded portion 10c that faces the one side edge seal portion 22a is an outlet. It functions as the unit 50. In the following description, a direction along the upper edge 21 to a position where the upper edge 21 and one side edge 22 intersect is also referred to as a fluid take-out direction. Moreover, in the following description, the part which comprises the outlet part 50 among the one side edge seal parts 22a is also called the outlet seal part 36.

  The unscheduled opening portion 35 of the outlet 50 extends from the outlet seal 36 toward the upper edge 21 so as to intersect with the fluid extraction direction. By breaking the bag 1 along the planned opening portion 35, an outlet for taking out the fluid is formed in the outlet 50. From the take-out port, for example, when the bag 1 is tilted, the bag 1 flows along the folded portion 10c of the upper edge 21 to reach the take-out port portion 50, and passes through a flow path having a width w defined by the take-out port portion 50. By doing so, the rectified fluid can be taken out.

  The unscheduled opening part 35 may be provided with easy-opening means for easily opening the unscheduled opening part 35. For example, as an easy-opening means, a half-cut line formed by laser processing or a cutter may be provided. Further, a stretched film may be included in the front film 11 or the back film 12 so that the stretched direction of the stretched film and the breaking direction of the bag 1 are matched. The bag 1 may be subjected to printing or the like for indicating the position to be opened to the user of the bag 1. Moreover, the notch 38 used as the starting point at the time of breaking the bag 1 may be formed in the part which overlaps with the scheduled opening part 35 among the outlet seal parts 36. FIG. Although not shown in the figure, a cut or scar group may be formed in the front film 11 and / or the back film 12 constituting the outlet seal portion 36 instead of or in addition to the notch 38. The scar group may include, for example, a plurality of through holes formed so as to penetrate the front film 11 and / or the back film 12. Alternatively, it may include a plurality of holes formed in the outer surfaces 11y and 12y of the front film 11 and / or the back film 12 so as not to penetrate the front film 11 and / or the back film 12. For example, the holes of the scar group may penetrate only the base material layer 52 described later of the front film 11 and / or the back film 12 and may not penetrate the thermoplastic resin layer 51.

  The fluid filled in the bag 1 is not particularly limited as long as it can pass through the outlet 50 and the opening 15 described later. For example, examples of the fluid filled in the bag 1 include fluids such as liquids such as liquid detergents and shampoos, powders and granules. These fluids may be taken out from the bag 1 via the outlet 50 and injected into the bottle. That is, the bag 1 may be a refill bag for refilling a fluid into a bottle having higher rigidity than the bag 1.

  Preferably, the distance from the lower edge 23 to the upper edge 21 is at least partially reduced from one side edge 22 to the other side edge 22 of the pair of side edges 22. For example, the distance H2 from the lower edge 23 to the upper edge 21 at the position of the other side edge 22 is smaller than the distance H1 from the lower edge 23 to the upper edge 21 at the position of the one side edge 22. As a result, as will be described later, the fluid can be guided more smoothly from the accommodating portion S toward the outlet 50, and thus the fluid take-out property can be improved.

  Next, components of the bag 1 will be described. FIG. 3 is an exploded view of members constituting the bag 1. As shown in FIG. 3, in the first embodiment, the bag 1 includes a front film 11, a rear film 12, a lower film 13 inserted between the front film 11 and the rear film 12, and the front film 11. It is comprised by the film 40 for closure attached to an inner surface. Among these, the surface film 11 includes a first portion 11 a located on the upper side of the bag 1 and a second portion 11 b located on the lower side of the bag 1. In 1st Embodiment, the opening part 15 mentioned later is formed by comprising the surface film 11 combining the 1st part 11a and the 2nd part 11b which were mutually isolate | separated.

  In the first embodiment, the upper edge 21 of the bag 1 is a folded portion formed by folding a single laminated film constituting at least a part of the front film 11 and at least a part of the back film 12. At least partially. In the example shown in FIG. 3, the upper edge 21 of the bag 1 is constituted by a folded portion 10 c formed by folding a single laminated film 10 constituting the first portion 11 a of the front film 11 and the back film 12. Has been. Further, as shown in FIGS. 1 and 2A, the above-described take-out port portion 50 is arranged so that the fluid flowing along the folded portion 10c of the upper edge 21 passes through the take-out port portion 50 when taken out to the outside. ing. Advantages of configuring the upper edge 21 and the outlet 50 will be described later.

  In FIG. 3, an example in which the entire upper edge 21 is configured by the folded portion 10 c is shown. However, the present invention is not limited to this, and a portion of the upper edge 21 that reaches the outlet 50 described later is included. What is necessary is just to be comprised by the folding | returning part 10c at least.

  As shown in FIG. 3, the lower surface film 13 is folded between the front film 11 and the rear film 12 in a state where the folded portion 13 c is folded back so as to protrude toward the inner side (accommodating portion S side) of the bag 1. Inserted. By forming the lower part of the bag 1 using the folded back film 13 in this way, the above-described gusset M can be formed in the lower part of the bag 1.

  In FIG. 3, reference numerals 10x, 11x, 12x, and 13x represent inner surfaces of the laminated film 10, the front film 11, the back film 12, and the bottom film 13, respectively. Reference numerals 10y, 11y, 12y, and 13y represent outer surfaces of the laminated film 10, the front film 11, the back film 12, and the bottom film 13, respectively. In the present specification, the “inner surface” is a surface facing the accommodating portion S filled with the fluid, and the “outer surface” is a surface located on the opposite side of the inner surface. Further, the closing film 40 includes a first surface 40x facing the surface film 11 and a second surface 40y located on the opposite side of the first surface 40x.

  Next, with reference to FIG. 2A and FIG. 2B, the structure of the bag 1 comprised by using the above-mentioned film 11, 12, 13, 40 is demonstrated in detail. FIG. 2B is a cross-sectional view showing the bag 1 shown in FIG. 2A as viewed along the line IIB-IIB.

(Aperture)
In the first embodiment, at least the surface film 11 of the surface film 11 and the back film 12 has an opening 15 penetrating the surface film 11 on the inner side of the seal portions 22a and 23a that define the accommodating portion S. At least partially. In addition, in the bag 1 in the state before the container S is filled with the fluid, the “opening 15” is formed by all layers such as a thermoplastic resin layer 51 and a base material layer 52, which will be described later, constituting the surface film 11. It is defined as the part that is divided. On the other hand, in the bag 1 in a state in which the sealing portion is formed so as to close the opening 15 after the accommodating portion S is filled with the fluid, the “opening 15” is the layer constituting the surface film 11. , Is defined as a portion where at least the base material layer 52 is divided.

  In FIG. 2A and FIG. 2B, the edge part of the 1st part 11a which faces the opening part 15 is represented by code | symbol 11ae, and the edge part of the 2nd part 11b which faces the opening part 15 is represented by code | symbol 11be. As long as the layers constituting the surface film 11 are separated from each other, the positional relationship between the end portion 11ae and the end portion 11be is not particularly limited. For example, as shown in FIG. 2B, the end portion 11ae and the end portion 11be may be in contact with each other. Further, as will be described later, the end portion 11ae and the end portion 11be may be separated from each other.

  As will be described later, the opening 15 is a portion through which the fluid passes when the accommodating portion S is filled with the fluid. The dimension of the opening 15 inside the seal portions 22a and 23a is preferably set wider so that the fluid can be efficiently filled. For example, as shown in FIG. 2A, the opening 15 may extend from one side edge seal portion 22a to the other side edge seal portion 22a. Note that the opening 15 may reach not only the inside of the seal portions 22a and 23a but also the inside of the seal portions 22a and 23a. FIG. 2A shows an example in which the opening 15 extends from one side edge 22 of the bag 1 to the other side edge 22.

  In addition, the direction in which the opening 15 extends is not particularly limited as long as the accommodation part S can be filled with the fluid via the opening 15. For example, the opening 15 may extend from the upper edge 21 toward the lower edge seal portion 23a. Also in this case, by providing the closing film 40 so as to overlap the opening 15, the fluid filling step and the closing step after the filling step can be easily performed. In the first embodiment, an example in which the upper edge 21 and the opening 15 extend substantially in parallel with each other will be described in consideration of the manufacturing efficiency of the bag 1. Note that “substantially parallel” means, for example, a straight line connecting the end of the opening 15 on the side edge 22 side and the end of the opening 15 on the other side edge 22 side, and the folded portion of the upper edge 21. It means that the angle formed by 10c is in the range of −5 to +5 degrees.

  Although not shown, the opening 15 may be formed not only on the front film 11 but also on the back film 12. For example, when the accommodating part S is divided into the 1st accommodating part by the side of the surface film 11 and the 2nd accommodating part by the side of the back film 12 in the inside of the bag 1, it is the opening part 15 in the surface film 11 and the back film 12, respectively. By forming the first and second accommodating portions, the fluid can be filled through the opening 15.

  Note that the front film 11 and the back film 12 are not particularly distinguished by the printed display applied. Therefore, the statement “at least the opening 15 is formed in the front film 11” does not limit that the opening 15 is formed in any one of the front film 11 and the back film 12. . In other words, the opening 15 described above may be formed in any of a pair of front and back films constituting the bag 1.

(Closing film)
The closing film 40 is a member provided to close the opening 15 after filling the accommodating part S with the fluid using the opening 15. The closing film 40 is attached to the inner surface 11 x of the surface film 11 so as to at least partially overlap the opening 15. 2A and 2B show an example in which the closing film 40 attached to the inner surface 11x of the surface film 11 is configured to overlap the entire area of the opening 15. In FIG. 2A and FIG. 2B, reference numeral 41 denotes a mounting seal portion formed by thermally welding the closing film 40 to the inner surface 11 x of the first portion 11 a of the surface film 11. The mounting seal portion 41 is formed so as to extend from one side edge seal portion 22a to the other side edge seal portion 22a. 2A shows an example in which the closing film 40 extends from one side edge 22 of the bag 1 to the other side edge 22. FIG.

  In addition, as long as the closing film 40 can be fixed to the inner surface 11x of the surface film 11 in the bag 1 in a state before the container S is filled with the fluid, the closing film 40 is fixed to the inner surface 11x of the surface film 11. The method of attaching to is not limited to heat welding. Moreover, as long as the closing film 40 can at least partially overlap the opening 15 after the accommodating portion S is filled with the fluid, the bag 1 in the state before the accommodating portion S is filled with the fluid. It is not always necessary that the closing film 40 overlaps the opening 15. For example, in the bag 1 in a state before the container S is filled with the fluid, the closing film 40 is folded, so that the closing film 40 does not have to overlap the opening 15. In this case, when the opening 15 is closed after the accommodating part S is filled with the fluid, the closed film 40 is overlapped with the opening 15 by spreading the folded closing film 40.

(Seal part)
Next, the side edge seal portion 22a, the lower edge seal portion 23a, and the mounting seal portion 41 will be described in detail. The side edge seal portion 22a is a seal portion formed by heat-welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12. On the other hand, the lower edge seal portion 23a is formed by thermally welding the inner surface 11x of the front film 11 and the inner surface 13x of the lower film 13, and by thermally welding the inner surface 12x of the back film 12 and the inner surface 13x of the lower film 13. It is the made seal part. The mounting seal portion 41 is a seal portion formed by thermally welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40.

  In this specification, for convenience of explanation, a seal portion obtained by heat-welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12, such as the side edge seal portion 22a, is referred to as a first type seal. Sometimes referred to as part R1. Further, a seal portion obtained by heat-welding the inner surface 11x of the surface film 11 or the inner surface 12x of the back film 12 and the inner surface 13x of the lower film 13 such as the lower edge seal portion 23a is a second type seal portion. Sometimes referred to as R2. Further, a seal portion obtained by heat-welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40, such as the mounting seal portion 41, is referred to as a third type seal portion R3. There is also. Moreover, as shown in FIG. 9 to be described later, a seal portion obtained by thermally welding the inner surface 12x of the back film 12 and the second surface 40y of the closing film 40 is referred to as a fourth type seal portion R4. There is also. Moreover, different hatching may be given with respect to a different kind of seal part.

  2A, when the closing film 40 extends from one side edge 22 of the bag 1 to the other side edge 22, the pair of side edges 22 has an inner surface 11x and a back film. There will be a portion where the inner surface 12x of 12 does not directly contact. In such a portion, as shown in FIG. 2A, a third type seal portion R3 is formed by thermally welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40, which will be described later. As shown in FIG. 14, the fourth type seal portion R4 is formed by heat-welding the inner surface 12x of the back film 12 and the second surface 40y of the closing film 40, whereby the inner surface 11x of the surface film 11 and The space between the inner surface 12x of the back film 12 may be sealed. In this case, the side edge seal part 22a is not only the first type seal part R1 formed by thermally welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12, but also the third type seal part R3 or The fourth type seal portion R4 is also included.

  Further, in the same manner as in the case where the closing film 40 is inserted between the front film 11 and the rear film 12, the lower film 13 is inserted between the front film 11 and the rear film 12. In addition, the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 do not come into direct contact. Considering this point, as shown in FIG. 2A, a notch 13 d may be formed in a portion of the lower film 13 along the side edge 22. In this case, the first type seal portion R1 can be formed by partially thermally welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 through the notch 13d. In FIG. 2, two notches 13d are formed along the direction in which the side edge 22 extends on the side edge (one side edge) 22 side of the pair of side edges 22 where the outlet 50 is formed. Is formed, and one notch 13d is formed on the other side edge 22 side.

  Next, a cross-sectional structure of the upper edge 21 including the folded portion 10c will be described. First, the cross-sectional structure of the upper edge 21 at a position away from the outlet 50 in the upper edge 21 will be described. FIG. 6 shows a cross section taken along line VI-VI in FIG. 2A. As shown in FIG. 6, the folded portion 10c of the upper edge 21 has an arcuate cross-sectional shape that is curved with a radius of curvature r1.

  Next, the cross-sectional structure of the portion of the upper edge 21 where the outlet 50 is formed will be described. FIG. 7 shows a cross-sectional shape of the opening scheduled portion 35, which is a cross-section along the line VII-VII in FIG. 2A. As shown in FIG. 7, in the planned opening portion 35, the inner surface 11x of the first portion 11a of the front film 11 and the inner surface 12x of the back film 12 are thermally welded to form a substantially elliptical cross-sectional shape as a whole. Has been. The folded portion 10c of the upper edge 21 has an arcuate cross-sectional shape.

(the film)
Next, an example of the layer configuration of the front film 11, the back film 12, the bottom film 13, and the closing film 40 will be described. First, referring to FIG. 4, the layer configuration of the laminated film 10, the front film 11, the back film 12, and the bottom film 13 will be described. As shown in FIG. 4, the laminated film 10, the front film 11, the back film 12, and the bottom film 13 include a base material layer 52 and a thermoplastic resin layer 51 provided on the base material layer 52. . In the example shown in FIG. 4, the base material layer 52 constitutes the outer surfaces 10 y, 11 y, 12 y, and 13 y of the films 10, 11, 12, and 13, and the thermoplastic resin layer 51 is the films 10, 11. , 12 and 13 constitute inner surfaces 10x, 11x, 12x and 13x. The base material layer 52 may be printed with characters, numbers, symbols, figures, patterns, etc. for indicating product information.

As a material constituting the base material layer 52, for example, polyethylene terephthalate or nylon can be used. The base material layer 52 can ensure high printability on the outer surfaces 10y, 11y, 12y, and 13y. The base material layer 52 has high heat resistance during heat welding.
As a material constituting the thermoplastic resin layer 51, for example, polyethylene or polypropylene can be used.
The thickness of the films 10, 11, 12, 13 is in the range of 20 to 250 μm, for example.

  Although not shown, the films 10, 11, 12, and 13 may further include an intermediate layer disposed between the base material layer 52 and the thermoplastic resin layer 51. As the intermediate layer, an appropriate one can be selected according to required performance such as water vapor and other gas barrier properties, light shielding properties, various mechanical strengths, and the like. For example, a metal layer, a vapor deposition layer of metal or metal oxide, or the like can be provided as the intermediate layer. In addition, a resin layer having a gas barrier property such as an ethylene-vinyl alcohol copolymer (EVOH), a polyvinylidene chloride resin (PVDC), or an aromatic polyamide such as nylon MXD6 may be provided as an intermediate layer. By providing such an intermediate layer, oxygen and water vapor can be prevented from entering the bag 1. A stretched nylon film may be provided as the intermediate layer. In this case, the puncture resistance of the bag 1 can be improved.

  Next, the layer configuration of the closing film 40 will be described with reference to FIG. As shown in FIG. 5, the closing film 40 includes a first layer 56 constituting the first surface 40 x of the closing film 40 and a second layer 57 constituting the second surface 40 y of the closing film 40. Contains.

The first layer 56 is a layer that is thermally welded to the thermoplastic resin layer 51 of the surface film 11 to form the mounting seal portion 41 described above and a closing seal portion 42 described later. Therefore, the first layer 56 of the closing film 40 is at least partially made of a material that can be thermally welded to the inner surface 11 x of the surface film 11. On the other hand, when the first layer 56 of the closing film 40 is thermally welded to the thermoplastic resin layer 51 of the surface film 11 in order to close the opening 15, the second layer 57 is also melted together with the first layer 56. Then, it is conceivable that the second layer 57 of the closing film 40 is thermally welded to the inner surface 12x of the back film 12 in the region of the accommodating portion S. Considering this point, the second layer 57 constituting the second surface 40y of the closing film 40 may be made of a material having a higher melting point than the material constituting the first layer 56 of the closing film 40. Good. For example, the combinations shown in Examples 1 to 3 in Table 1 below can be adopted as a combination of the material constituting the first layer 56 and the material constituting the second layer 57.

  In addition, in order to prevent the second layer 57 of the closing film 40 from being thermally welded to the inner surface 12x of the back film 12 in the region of the accommodating portion S, the second layer 57 of the closing film 40 is not illustrated. The second surface 40y of the closing film 40 and the back film 12 are formed on a part of the surface 40y located in the housing part S and a part of the inner surface 12x of the back film 12 overlapping the closing film 40 in the housing part S. An inhibitor that inhibits thermal welding from occurring between the inner surface 12x and the inner surface 12x may be provided. As the inhibitor, for example, an ink (for example, DIC Corporation, Polycoat P-91, solid content of 10%) containing silicone resin and cellulose resin as main components and ethyl acetate as a solvent can be used.

In addition, in FIG. 5, although the 1st surface 40x of the film 40 for closure was shown with the 1st layer 56 covering the whole region, it is not restricted to this. Of the first surface 40x of the closing film 40, the portion to be thermally welded to the inner surface 11x of the surface film 11 only needs to be constituted by at least the first layer 56, and the other portions of the first surface 40x are not shown. However, it may be configured by the second layer 57 and other layers.
5 shows an example in which the second surface 40y of the closing film 40 is configured by the second layer 57 over the entire area, the present invention is not limited to this. Of the second surface 40y of the closing film 40, the portion facing the part of the first surface 40x thermally welded to the inner surface 11x of the surface film 11 only needs to be constituted by at least the second layer 57, and the second Other portions of the surface 40y may be configured by the first layer 56 and other layers, although not shown.

  Similarly to the case of the front film 11, the back film 12, and the bottom film 13, an intermediate layer may be disposed between the first layer 56 and the second layer 57 of the closing film 40. The thickness of the closing film 40 is, for example, in the range of 20 to 250 μm. Examples of the intermediate layer include aromatic polyamides such as ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC), and nylon MXD6 as in the case of the surface film 11, the back film 12, and the bottom film 13. For example, a resin layer having a high gas barrier property can be used.

  In addition, it cannot be overemphasized that the layer structure of the surface film 11, the back surface film 12, the lower surface film 13, and the film 40 for closure is not limited to what was mentioned above.

(Bag manufacturing method)
Next, a method for manufacturing the bag 1 according to the first embodiment will be described.

[Production process of laminated film (first process)]
First, an example of the process of producing the raw film of the laminated film 10 for the front film 11 and the back film 12 will be described. First, a raw material of one base material layer 52 is prepared. Here, the original fabric means a wound roll film. Next, printing display may be performed on one surface of the film of the long base layer 52 unwound from one original fabric. For example, the printing display for the surface film 11 is repeatedly performed on one side of the film of the long base layer 52, and on the other side of the film of the long base layer 52 The printing display for the back film 12 may be repeated. Next, using a dry lamination method or a melt extrusion lamination method, the thermoplastic resin layer 51 is laminated on the film of the long base material layer 52 to produce the long laminated film 10. In this way, an original fabric of the laminated film 10 for the front film 11 and the back film 12 is obtained. In addition, you may make it give a printing display to the laminated | multilayer film 10, without giving in the state of the film of a base material layer.

  Hereinafter, the method of manufacturing the bag 1 using the raw fabric of the laminated film 10 obtained as described above will be described.

[Film preparation process (second process)]
First, the raw material of the above-mentioned laminated film 10 is prepared. In addition, in the manufacturing apparatus in which the original film of the laminated film 10 is prepared, the original film of the bottom film 13 and the original film of the closing film 40 may be prepared. Next, as shown in FIG. 8, the laminated film 10 is unwound from the original fabric. Moreover, as shown in FIG. 8, the elongate lower surface film 13 and the closing film 40 are prepared so that it may overlap with the elongate laminated film 10 unwound from the original fabric. In FIG. 8, the conveyance direction of each long film unwound from the original fabric is represented by the symbol T.

  As shown in FIG. 8, a plurality of through holes 13 e may be formed in the lower film 13. The through hole 13e is to be a notch 13d of the bag 1 later.

[Folding step (third step)]
Next, as shown in FIG. 9A, a folding step is performed in which the long laminated film 10 is folded to form a folded portion 10c. Further, the long bottom film 13 is folded to form a folded portion 13c. By folding the long laminated film 10, the surface film 11 of the bag 1 will be formed later, and the surface film 11 is integrally formed with the long surface film 11 and the folded portion 10 c. Moreover, the elongate back film 12 can be obtained. 9B is a cross-sectional view showing a case where each film shown in FIG. 9A is cut along a direction perpendicular to the film transport direction T. FIG. The lower film 13 is folded back so that the corresponding pair of through holes 13e overlap each other.

[Mounting process (4th process)]
Next, the attachment process which attaches the film 40 for closure to the inner surface 11x of the surface film 11 is implemented. First, the surface film 11 and the closing film 40 are arranged so that the long surface film 11 overlaps the long closing film 40. Thereafter, as shown in FIG. 10, the first seal surface 40 x of the closing film 40 is partially thermally welded to the inner surface 11 x of the surface film 11, thereby forming the mounting seal portion 41. Preferably, the heating temperature of the surface film 11 and the closing film 40 when forming the mounting seal portion 41 is such that the material constituting the thermoplastic resin layer 51 of the surface film 11 and the first layer 56 of the closing film 40 are the same. It is controlled to be higher than the melting point of the constituent material, but lower than the melting point of the material constituting the second layer 57 of the closing film 40. Thereby, it is possible to prevent the second layer 57 of the closing film 40 from being melted during the thermal welding.

  In addition, as long as the film 40 for closure can be attached to the inner surface 11x of the surface film 11, the width | variety and specific pattern shape of the seal part 41 for attachment are not restricted especially. For example, the mounting seal portion 41 may include a plurality of intermittently disposed seal portions. Further, the width of the mounting seal portion 41 may vary depending on the position. Further, the direction in which the mounting seal portion 41 extends and the direction in which the closing film 40 and the opening 15 extend may be at least partially non-parallel.

[Lower edge seal forming step (fifth step)]
Further, as shown in FIG. 10, a lower edge seal portion forming step of forming the lower edge seal portion 23 a by thermally welding the inner surface 13 x of the lower film 13 to the inner surface 11 x of the surface film 11 and the inner surface 12 x of the back film 12. carry out. The lower edge seal portion forming step may be performed simultaneously with the above-described attachment step of attaching the closing film 40 to the surface film 11.

[Opening Step (Sixth Step)]
Next, using a cutter blade or the like provided so as to extend along the conveyance direction T of the long surface film 11, the long surface film 11 is transferred to the two while continuously conveying the surface film 11. By cutting into parts, the first part 11a and the second part 11b having a long shape are obtained, and an opening 15 is formed between the end part 11ae of the first part 11a and the end part 11be of the second part 11b. An opening forming step is performed. As shown in FIG. 11, the opening forming step is performed such that the mounting seal portion 41 described above is located on the first portion 11 a side and the closing film 40 at least partially overlaps the opening 15. .

As a cutter blade for cutting the long surface film 11, one cutter blade may be used, or arranged at a predetermined interval in a direction orthogonal to the conveying direction of the long surface film 11. Two cutter blades may be used. When cutting the surface film 11 using one cutter blade, as shown in FIG. 2B described above, the end portion 11ae of the first portion 11a and the end portion 11be of the second portion 11b are in contact with each other or very close to each other. Will come to do. On the other hand, when the surface film 11 is cut using two cutter blades, a predetermined interval is present between the end portion 11ae of the first portion 11a and the end portion 11be of the second portion 11b.
In addition, the long surface film 11 is cut into two parts using a cutter blade provided so as to extend along the conveying direction of the long surface film 11, and the first part 11a and the second part 11b are cut. When obtained, the opening 15 extends in parallel with the folded portion 10c of the upper edge 21 from the one side edge seal portion 22a to the other side edge seal portion 22a. Moreover, when obtaining the 1st part 11a and the 2nd part 11b in this way, since the opening part 15 can be formed continuously, conveying the elongate surface film 11, it is excellent in manufacture aptitude. Yes.

[Side Edge Seal Forming Step (Seventh Step)]
Next, at least partly between the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 by heat welding along the portions to be the side edges 22 of the front film 11 and the back film 12. The side edge seal portion forming step for forming the side edge seal portion 22a is performed. Thereby, the accommodating part S is defined inside the side edge seal part 22a and the lower edge seal part 23a. When the closing film 40 extends from one side edge 22 to the other side edge 22 of the bag 1, the inner surface 11x of the surface film 11 and the closing film are located at a position where the closing film 40 and the side edge seal portion 22a overlap. The third type seal portion R3 is formed by heat welding the first surface 40x of the film 40, and the fourth surface is formed by heat welding the inner surface 12x of the back film 12 and the second surface 40y of the closing film 40. The seed seal portion R4 may be formed. FIG. 12 is a plan view showing a case where each film in a state in which the side edge seal portion 22a is formed by heat-welding the long surface film 11 and the back film 12 is viewed from the surface film 11 side. .

[Division process (8th process)]
Next, as shown in FIG. 13, a cutting step is performed in which the long films 11, 12, 13, and 40 that are thermally welded to each other are cut along the shape of the outer edge of the bag 1. Thereby, the bag 1 in which the accommodating portion S is defined inside the side edge seal portion 22a and the lower edge seal portion 23a can be obtained. This dividing step is performed so that each of the through holes 13e formed in the lower film 13 is divided into two parts. Thereby, as shown in FIG. 13, a notch 13 d can be formed in each bag 1. Further, the first type seal portion R1 can be formed by partially thermally welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 through the notches 13d.

  As shown in FIG. 13, in the first embodiment, the folded portion 10 c formed by folding the long laminated film 10 constitutes the upper edge 21 of the bag 1. The opening 15 is formed by cutting the long surface film 11 using a cutter blade or the like provided so as to extend along the transport direction T. Therefore, as shown in FIG. 13, the opening 15 is formed in the surface film 11 so as to reach from one side edge 22 of the pair of side edges 22 of the bag 1 to the other side edge 22. Further, the upper edge 21 extends substantially parallel to the opening 15.

  As shown in FIG. 13, all of the upper edge 21 of the bag 1, the opening 15, and the closing film 40 extend in parallel to the conveying direction T of each long film. Therefore, according to the first embodiment, the upper edge 21 including the folded portion 10c, the opening 15 penetrating the surface film 11, and the closure attached to the inner surface 11x of the surface film 11 so as to overlap the opening 15 The bag 1 provided with the film 40 can be efficiently manufactured using each long film.

  By the way, in the first embodiment, the upper edge 21 is configured to be inclined at a predetermined angle with respect to the lower edge 23 as shown in FIG. 2A described above. For this reason, as shown in FIG. 13, in the dividing step of dividing each long film along the shape of the outer edge of the bag 1, each film along the direction inclined at a predetermined angle with respect to the transport direction T. The lower edge 23 of the bag 1 is obtained.

  In addition, the above-mentioned “film preparation step (second step)”, “folding step (third step)”, “attaching step (fourth step)”, “lower edge seal portion forming step (fifth step)”, “ The “opening portion forming step (sixth step)”, “side edge seal portion forming step (seventh step)” and “dividing step (eighth step)” may all be performed inline. That is, the 2nd process-the 8th process may be implemented continuously, without winding up each film on the way.

  Moreover, the order in which the above-described second to eighth steps are performed is not particularly limited. For example, the lower edge seal portion forming step (fifth step) and the side edge seal portion forming step (seventh step) may be performed after the attachment step (fourth step) or the opening portion forming step (sixth step). Good. Moreover, you may implement an attachment process (4th process) before a folding | turning process (3rd process).

  Further, as in the above-described opening forming step (sixth step), the first film 11a and the second film 11b are not obtained by dividing the surface film 11 integrally formed with the back film 12, but the first film 11a and the second film 11b. The two portions 11b may be prepared separately from the first portion 11a and the back film 12. For example, the original fabric from which the laminated film 10 for constituting the first portion 11a and the back film 12 is wound and the original fabric from which the second portion 11b is wound may be separately prepared.

  Further, as illustrated in FIG. 20 described later, when the opening 15 is formed so as not to overlap the pair of side edge seal portions 22a, the above-described opening forming step (sixth step) is a surface film. In place of the step of dividing 11, the surface film 11 may be slitted intermittently to form the opening 15 intermittently along the longitudinal direction of the long surface film 11. Good. “Intermittently” means that two adjacent openings 15 are not connected to each other. Note that the step of intermittently slitting the surface film 11 to form the openings 15 intermittently is preferably performed after the folding step of folding the laminated film 10 to form the folded portion 10c. This is because, when the folding process is performed after the slit processing, the accuracy of the folding position of the laminated film 10 may be lowered at the time of folding.

  Moreover, in the above-mentioned 2nd process-7th process, each film 11, 12, 13, 40 is heat-welded and cut | disconnected in the elongate state, and the parting process (8th process) is implemented after that. showed that. However, the present invention is not limited to this, and all or part of the second to seventh steps described above are performed in a state where each film 11, 12, 13, 40 is cut according to the size of the bag 1. Also good.

  Next, the cross-sectional structure of the portion including the closing film 40 in the side edge seal portion 22a of the bag 1 manufactured as described above will be described. FIG. 14 is a cross-sectional view showing an example of a side edge seal portion 22a formed in a portion where the closing film 40 is interposed between the front film 11 and the back film 12. As described above, when the closing film 40 extends from one side edge 22 to the other side edge 22 of the bag 1, as shown in FIG. 14, the inner surface 11 x of the front film 11 and the inner surface 12 x of the back film 12. There is a part that does not directly contact. Even in this case, as shown in FIG. 14, the third type seal portion R3 is formed by thermally welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40, and the rear film The fourth type seal portion R4 is formed by thermally welding the inner surface 12x of the twelve and the second surface 40y of the closing film 40, and thereby, between the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12. Can be sealed. In order to form the fourth type seal portion R4, it is necessary to perform the thermal welding at a temperature higher than the melting point of the material constituting the second surface 40y of the closing film 40. Or it is good also considering the material of the part corresponding to the side edge seal | sticker part 22a among the 2nd surfaces 40y of the film 40 for closure as the material same as the material which comprises the 1st surface 40x.

(Filling method of fluid)
Next, a method for manufacturing the bag 1 in which the bag 1 is filled with the fluid and the container S is filled with the fluid will be described.

  First, the filling process for filling the accommodating part S with the fluid through the opening 15 will be described. First, as shown in FIG. 15A, a bag 1 is prepared that is held so that the lower edge 23 is positioned below. At this time, although not shown, the bag 1 may be held by using a grip for holding the side edge seal portion 22a. Next, the fluid is filled into the accommodating portion S of the bag 1 from the nozzle of the filling device F through the opening 15. Here, as described above, the opening 15 extends from one side edge seal portion 22a to the other side edge seal portion 22a. For this reason, the width | variety of the opening in the case of filling can be ensured widely.

  Next, the first step 40x of the closing film 40 and the inner surface 11x of the surface film 11 are at least partially thermally welded to form a seal portion, thereby closing the opening 15 is performed. In FIG. 15B and FIG. 16, the closing seal portion formed as the third-type seal portion R3 by thermally welding the first surface 40x of the closing film 40 and the inner surface 11x of the surface film 11 is represented by reference numeral 42. Has been. FIG. 16 is a cross-sectional view showing the bag with the opening 15 closed by the closing film 40, and is a cross-sectional view showing the bag 1 shown in FIG. 15B when viewed along the XVI-XVI line.

  In the example shown in FIGS. 15B and 16, the closing seal portion 42 overlaps with the opening 15 and is formed so as to extend from one side edge seal portion 22 a to the other side edge seal portion 22 a. By forming such a sealing part 42 for closing, the opening part 15 of the bag 1 filled with the fluid can be closed and the bag 1 can be sealed.

  Preferably, in the closing step, the temperature of the thermal welding is higher than the melting point of the material constituting the thermoplastic resin layer 51 of the first portion 11a and the material constituting the first layer 56 of the closing film 40, but for closing. It is controlled so as to be lower than the melting point of the material constituting the second layer 57 of the film 40. Thereby, it is possible to prevent the second layer 57 of the closing film 40 from being melted at the time of heat welding, and thereby, the second surface 40y of the closing film 40 and the outer surface 12y of the back film 12 Can be prevented from being thermally welded.

  By the way, in the closing step, when the surface film 11 and the closing film 40 are thermally welded, the ends of the thermoplastic resin layer 51 and the second portion 11b that are exposed at the end portion 11ae of the first portion 11a of the surface film 11 are used. The thermoplastic resin layer 51 exposed to the part 11be is also thermally welded at the same time, and the end part 11ae and the end part 11be may be partially coupled. On the other hand, as long as the temperature of heat welding is lower than the melting point of the material constituting the base material layer 52 of the surface film 11, the base material layer 52 exposed at the end portion 11ae and the base exposed at the end portion 11be. The material layer 52 does not melt. Therefore, in the bag 1 in a state after the accommodating part S is filled with the fluid, the “opening 15” includes at least the base material layer 52 among the layers constituting the surface film 11 as described above. Can be defined as a part.

  In FIG. 16, an example is shown in which the closing seal portion 42 is formed so as to overlap the opening 15. However, as long as the closing process is performed so that the opening 15 is surrounded by the mounting seal portion 41 and the closing seal portion 42 between the first surface 40x of the closing film 40 and the inner surface 11x of the surface film 11. The specific shape and arrangement of the closing seal portion 42 are not particularly limited. For example, as shown in FIG. 17, a pair of closing seal portions 42 may be formed so as to face each other with the opening 15 interposed therebetween. In addition, when the space between the surface film 11 and the closing film 40 on the first portion 11a side is sealed in advance by the mounting seal portion 41 formed before the closing step, the closing seal portion 42 may be formed only between the second portion 11 b of the surface film 11 and the closing film 40. That is, as long as it is possible to prevent the accommodating portion S and the space outside the bag 1 from communicating with each other through the opening 15, various forms can be considered as the shape and arrangement of the closing seal portion 42.

  As described above, in the bag 1 according to the first embodiment, at least the surface film 11 has the opening 15 penetrating the surface film 11 at a position inside the seal portions 22a and 23a that define the accommodating portion S. At least partially formed. For this reason, the accommodation part S of the bag 1 can be filled with a fluid through the opening 15 formed in the surface film 11. A closing film 40 is attached to the inner surface 11x of the surface film 11 so as to at least partially overlap the opening 15. For this reason, after filling the accommodating part S of the bag 1 with the fluid, the opening 15 formed in the surface film 11 can be closed by thermally welding the closing film 40 to the inner surface 11x of the surface film 11. it can. Therefore, even when the outlet 50 is formed in the upper part of the bag 1, a wide opening width can be secured during filling. Thereby, the bag 1 which is excellent in fluid filling suitability and has the outlet 50 can be provided.

  Next, the operation when the fluid is taken out from the bag 1 manufactured as described above and filled with the fluid in the accommodating portion S using the outlet 50 will be described.

First, the flow path of the fluid in the case of a conventional bag will be described. In the conventional bag, the flow path of the fluid in the outlet portion is formed between a pair of seal portions obtained by thermally welding the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12.
In a bag made of a flexible packaging material, the flow path of the fluid at the outlet is secured by increasing the distance between the front film 11 and the back film 12 due to the pressure from the fluid. Further, the presence of the fluid in the outlet portion increases the rigidity of the outlet portion when the fluid is taken out. On the other hand, in the conventional bag, since the surface film 11 and the back film 12 are fixed to each other on both sides of the flow path of the fluid at the outlet, the front film 11 and the back film 12 It is difficult to spread the gap between the two. That is, it is not possible to ensure a sufficiently large flow path for the fluid at the outlet. This means that when the fluid is taken out, the amount of the fluid located in the outlet portion is small, and therefore it is difficult to ensure sufficient rigidity of the outlet portion. As a result, it is conceivable that the outlet portion is closed during the extraction of the fluid, or the outlet portion is bent during the extraction of the fluid.

  On the other hand, in the first embodiment, the outlet 50 is formed between the folded portion 10 c of the upper edge 21 and the outlet seal 36. The folded portion 10c is a portion formed by folding the laminated film 10. Therefore, the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 are not in close contact with each other in the folded portion 10c. For this reason, in the first embodiment, as shown in FIGS. 6 and 7, the folded portion 10c can be formed as a curved portion. For example, the curved portion may be arcuate as a whole or U-shaped. In either case, the folded portion 10c has an arc shape having a predetermined radius of curvature.

  Thus, in 1st Embodiment, compared with the case where an outlet part is formed between a pair of seal parts by including the folding | returning part 10c in the outlet part 50, in the upper edge 21 vicinity. The inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 are difficult to adhere. For this reason, in the taking-out part 50, the space | interval between the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 can be maintained widely. Accordingly, a sufficiently large flow path for the fluid in the outlet 50 can be secured, and therefore a large amount of fluid can be present in the outlet 50 when the fluid is taken out. . Thereby, the rigidity of the outlet 50 can be sufficiently secured, and this can prevent the outlet 50 from being blocked during the extraction of the fluid. Moreover, it can suppress that the taking-out part 50 bends in the middle of taking out a fluid.

  In the first embodiment, the upper edge 21 of the bag 1 is constituted by the folded portion 10 c of the laminated film 10, and the folded portion 10 c extends to the outlet 50. For this reason, compared with the case where the upper edge 21 of the bag 1 is formed of the seal portion, the distance between the front film 11 and the back film 12 in the vicinity of the upper edge 21 can be maintained wide. Thereby, the flow path of the fluid in the upper edge 21 of the bag 1 can be secured widely. For this reason, when the bag 1 is tilted, the fluid that has reached the upper edge 21 of the bag 1 from the storage portion S Smooth guidance toward the outlet 50 can be achieved. In addition, by increasing the length of the upper edge 21 of the bag 1 constituted by the folded portion 10 c of the laminated film 10, a sufficient amount of fluid can be stored along the upper edge 21 of the bag 1. . For this reason, the extractability of a fluid can be improved.

  In the bag 1 of the first embodiment, the distance from the lower edge 23 to the upper edge 21 is at least partially as it goes from one side edge 22 to the other side edge 22 of the pair of side edges 22. It is getting smaller. For example, the distance H2 from the lower edge 23 to the upper edge 21 at the position of the other side edge 22 is smaller than the distance H1 from the lower edge 23 to the upper edge 21 at the position of the one side edge 22. The outlet 50 is formed on the side edge 22 side. As a result, the upper edge 21 formed of the folded portion 10 c is inclined upward at a predetermined angle with respect to the lower edge 23 as it goes from the other side edge 22 to the one side edge 22. For this reason, compared with the case where the upper edge 21 extends in parallel to the lower edge 23, the fluid that reaches the upper edge 21 of the bag 1 from the storage portion S and flows toward the outlet 50 when the bag 1 is inclined. However, the degree of direction change performed near the upper edge 21 of the bag 1 can be reduced. Thereby, since a fluid can be guide | induced more smoothly toward the extraction port part 50, the extractability of a fluid can further be improved. Further, when the bottle to be refilled is in the upright posture, it becomes easy to insert the outlet 50 of the bag 1 into the mouth of the bottle. Furthermore, when returning the tilted bag 1 to the original posture, it is possible to prevent the liquid from dripping.

  In the above-described first embodiment, the example in which the folded portion 10c of the upper edge 21 is formed as a curved portion has been described. However, even if the folded portion 10c is formed as a bent portion, the inner surface 11x of the surface film 11 is compared with the case where the upper edge 21 of the bag 1 is constituted by a seal portion because of the elastic characteristics of the laminated film 10. And the inner surface 12x of the back film 12 are considered to be difficult to adhere to each other. Therefore, even if the folded portion 10c of the upper edge 21 is a bent portion, the fluid take-out property can be improved as compared with the conventional bag.

  Various modifications can be made to the above-described first embodiment. Hereinafter, modified examples will be described with reference to the drawings as necessary. In the following description and the drawings used in the following description, parts that can be configured in the same manner as in the first embodiment described above are the same as those used for the corresponding parts in the first embodiment described above. Reference numerals will be used, and redundant description will be omitted. In addition, when it is clear that the operational effects obtained in the above-described first embodiment can be obtained in the modified example, the description thereof may be omitted.

(Modification of opening)
Hereinafter, some modified examples of the opening 15 will be described with reference to FIGS. 18A to 23.

  In the first embodiment described above, in the opening portion 15, the end portion 11ae of the first portion 11a of the surface film 11 and the end portion 11be of the second portion 11b are in contact with each other or very close to each other. showed that. However, the present invention is not limited to this, and as shown in FIGS. 18A and 18B, in the opening portion 15, between the end portion 11 ae of the first portion 11 a and the end portion 11 be of the second portion 11 b of the surface film 11. There may be a predetermined interval. 18A is a cross-sectional view showing the bag 1 having the opening 15 in a state before being closed by the closing film 40, and FIG. 18B shows the opening 15 of the bag 1 shown in FIG. 18A. It is sectional drawing which shows the state closed by 40. FIG. The interval between the end portion 11ae of the first portion 11a and the end portion 11be of the second portion 11b in the state where the opening portion 15 is closed by the closing film 40 is not particularly limited, but is preferably in the range of 0 to 10 mm. And more preferably within the range of 1 to 7 mm.

  In addition, as shown in FIGS. 19A and 19B, in the opening portion 15, the end portion 11ae of the first portion 11a of the surface film 11 overlaps the second portion 11b, and the end portion 11be of the second portion 11b is the first portion. It may overlap the portion 11a. 19A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 19B shows the opening 15 of the bag 1 shown in FIG. 19A. It is sectional drawing which shows the state closed by 40. FIG. The width of the portion where the first portion 11a and the second portion 11b overlap is not particularly limited, but the end portion 11ae and the second portion of the first portion 11a in a state where the opening 15 is closed by the closing film 40. The width of the end portion 11be of 11b can be set within a range of 2 to 6 mm, for example.

  In the bag 1 shown to FIG. 19A, the fluid is filled into the accommodating part S of the bag 1 through the opening part 15 in the state which pulled away the 2nd part 11b from the 1st part 11a so that the opening part 15 may spread. . Preferably, as shown to FIG. 19A, the part which has a large area among the 1st part 11a and the 2nd part 11b, here the 2nd part 11b is located in the outer surface side of the bag 1 rather than the 1st part 11a. The first portion 11a and the second portion 11b are overlapped. After that, as shown in FIG. 19B, the second portion 11 b is pressed toward the closing film 40 so that the portion of the second portion 11 b of the surface film 11 that does not overlap the first portion 11 a contacts the closing film 40. By heating while heating, the inner surface 11x of the second portion 11b and the first surface 40x of the closing film 40 are thermally welded. Thereby, the sealing part 42 for closure for closing the opening part 15 can be formed.

  In the first embodiment described above, the example in which the opening 15 extends from one side edge seal portion 22a to the other side edge seal portion 22a has been described. However, the present invention is not limited to this, and as shown in FIG. 20, the opening 15 does not overlap the pair of side edge seal portions 22a, and the one side edge seal portion 22a and the other side edge seal portion. It may be formed in the surface film 11 between 22a. Even in this case, the fluid can be filled into the accommodating portion S of the bag 1 through the opening 15. Moreover, after filling the accommodating part S of the bag 1 with a fluid, the opening 15 formed in the surface film 11 can be closed by thermally welding the closing film 40 to the inner surface 11x of the surface film 11. . According to this modification, the opening 15 and the closing film 40 are not allowed to reach the side edge seal portion 22a, thereby improving the sealing performance of the bag 1 after the opening 15 is closed using the closing film 40. be able to.

  In the first embodiment described above, the example in which the opening 15 extends linearly between the one side edge seal portion 22a and the other side edge seal portion 22a has been described. However, the present invention is not limited to this, and the opening 15 may include a curved portion. In FIG. 21, an example in which the opening 15 includes a curved portion so as to protrude from the lower portion of the bag 1 toward the upper portion is shown. By curving the opening 15 in this manner, the opening 15 can be easily widened during the filling process, thereby further enhancing the fluid filling suitability. As shown in FIG. 22, the opening 15 has a curved portion projecting from the lower portion of the bag 1 toward the upper portion and a curved portion projecting from the upper portion of the bag 1 toward the lower portion. And may be present repeatedly.

  In the first embodiment described above, an example in which the opening 15 continuously extends between one side edge seal portion 22a and the other side edge seal portion 22a has been described. However, the present invention is not limited to this, and a plurality of intermittently extending openings 15 are formed in the surface film 11 as shown in FIG. 23 as long as sufficient filling ability can be ensured in the filling step. May be. In this case, a connecting portion 15 a exists between two adjacent openings 15. The connecting portion 15a is defined as a portion where the layers constituting the surface film 11 located between the two openings 15 are not divided.

  The width of the connecting portion 15a is set so that the connecting portion 15a can be broken by pulling the first portion 11a or the second portion 11b toward the outer surface 11y side of the surface film 11 or the like. For this reason, at the time of a filling process, the connection part 15a is fractured | ruptured and each opening part 15 is connected, and the width | variety of the opening at the time of filling can be ensured widely. Further, due to the presence of the connecting portion 15a, the first portion 11a and the second portion 11b are deformed due to a frictional force or the like generated at the time of manufacturing or transporting the bag 1 before being filled with the fluid, thereby opening the bag. It can be suppressed that the shape of the portion 15 is distorted. That is, it is possible to improve the manufacturing suitability and transport suitability of the bag 1 before being filled with the fluid.

  In the example shown in FIGS. 20 to 23 described above, the bag 1 is shown before the container S is filled with the fluid.

(Modification of film for closure)
Hereinafter, some modified examples of the closing film 40 will be described with reference to FIGS. 24 to 27B.

  In the above-described first embodiment, an example in which the closing film 40 extends from one side edge 22 of the bag 1 to the other side edge 22 has been described. However, the present invention is not limited to this, and as shown in FIG. 24, the closing film 40 is configured to reach the pair of side edge seal portions 22 a but not to the pair of side edges 22. May be. Note that FIG. 24 shows the bag 1 in a state before the container S is filled with the fluid. FIG. 25A is an enlarged view of a portion surrounded by a frame XXV in FIG. FIG. 25B is a diagram showing a state in which the opening 15 of the bag 1 shown in FIG. 25A is closed by the closing film 40.

  When the closing film 40 is configured not to reach the pair of side edges 22, as shown in FIG. 25A, the side edges 22 of the side edge seal portions 22 a extending along the side edges 22 of the bag 1 are formed. The first type seal portion R1 can be formed in a portion overlapping the closing film 40 in the orthogonal direction. For this reason, the side edge seal portion 22a can include a first type seal portion R1 that continues from the upper edge 21 to the lower edge seal portion 23a, and thereby the bag 1 can be sealed more firmly. FIG. 25A shows an example in which the side edge seal portion 22a includes a third type seal portion R3 formed by thermally welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40. However, it is not limited to this. In the present modification, although not illustrated, the third type seal portion R3 may not be included in the side edge seal portion 22a.

  In addition, as shown in FIGS. 26A and 26B, the closing film 40 may be configured not to reach the side edge seal portion 22a. 26A is a cross-sectional view showing the bag 1 having the opening 15 in a state before being closed by the closing film 40, and FIG. 26B shows the opening 15 of the bag 1 shown in FIG. 26A. It is sectional drawing which shows the state closed by 40. FIG.

  In addition, as shown to FIG. 26A, when the part which the film 40 for closure and the opening part 15 have not overlapped in the position inside seal | sticker parts 22a and 23a which demarcated the accommodating part S exists, the opening part 15 and The opening 15 cannot be completely closed only by the mounting seal portion 41 or the closing seal portion 42 formed by heat welding between the closing film 40 and the film. In this case, as shown in FIG. 26B, the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 are thermally welded so as to sandwich or cover a portion of the opening 15 that does not overlap with the closing film 40. By forming the type 1 seal portion R1, the opening 15 can be closed. In the example shown in FIG. 26B, it can be said that the closing seal portion 42 includes the first type seal portion R1 in addition to the third type seal portion R3. Thus, the closing process of closing the opening 15 includes the third type seal portion R3 between the first surface 40x of the closing film 40 and the inner surface 11x of the surface film 11, and the inner surface 11x and the back surface of the surface film 11. The opening 15 may be surrounded by the combination of the first type seal portion R1 with the inner surface 12x of the film 12.

  As shown in FIGS. 27A and 27B, the closing film 40 may have a plurality of through holes 43 formed therein. 27A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 27B shows the opening 15 of the bag 1 shown in FIG. It is sectional drawing which shows the state closed by 40. FIG.

  In the example shown in FIGS. 27A and 27B, in the portion of the side edge seal portion 22a that overlaps with the through hole 43 of the closing film 40, the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 via the through hole 43. Can be partially heat-welded to form the first type seal portion R1. Thereby, the bag 1 can be sealed more firmly. In addition, the through-hole 43 may be formed not only in the part which overlaps the side edge seal part 22a among the films 40 for closure but in the position inside the seal parts 22a and 23a. Further, one through hole 43 may be formed.

(Variation regarding combination of closing film and opening)
Hereinafter, with reference to FIG. 28A-FIG. 30C, some modifications regarding the combination of the film 40 for closure and the opening part 15 are demonstrated. In each modification shown in FIGS. 28A to 30C, the opening 15 is configured not to reach the side edge seal portion 22 a and to have a predetermined opening width t in the direction along the side edge 22. Such an opening 15 can be formed, for example, by partially cutting out the surface film 11 using a predetermined mold.

  In the example shown in FIGS. 28A and 28B, the closing film 40 is configured to extend from one side edge 22 of the bag 1 to the other side edge 22. 28A is a cross-sectional view showing the bag 1 having the opening 15 in a state before being closed by the closing film 40, and FIG. 28B shows the opening 15 of the bag 1 shown in FIG. 28A. It is sectional drawing which shows the state closed by 40. FIG. In this modification, by forming the closing seal portion 42 so that the opening 15 is sandwiched between the mounting seal portion 41 and the closing seal portion 42, as shown in FIG. After filling S with the fluid, the opening 15 can be closed using the closing film 40. Note that both the mounting seal portion 41 and the closing seal portion 42 are formed so as to extend from one side edge seal portion 22a to the other side edge seal portion 22a.

  In the example shown in FIGS. 29A and 29B, the closing film 40 is configured to reach the pair of side edge seal portions 22 a but not to the pair of side edges 22. 29A is a cross-sectional view showing the bag 1 having the opening 15 in a state before being closed by the closing film 40, and FIG. 29B shows the opening 15 of the bag 1 shown in FIG. 29A. It is sectional drawing which shows the state closed by 40. FIG. Also in this modified example, the closing seal portion 42 is formed so that the opening 15 is sandwiched between the mounting seal portion 41 and the closing seal portion 42 as in the case shown in FIGS. 28A and 28B described above. (See FIG. 29B), the opening 15 can be closed using the closing film 40 after the container 1 of the bag 1 is filled with the fluid.

  In the example shown in FIGS. 30A and 30B, the closing film 40 is configured not to reach the side edge seal portion 22a. 30A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 30B shows the opening 15 of the bag 1 shown in FIG. 30A. It is sectional drawing which shows an example of the state closed by 40. FIG. FIG. 30C is a cross-sectional view showing another example of the state in which the opening 15 of the bag 1 shown in FIG. 30A is closed by the closing film 40.

  In the example shown in FIG. 30B, the closing seal portion 42 includes a third type seal portion R3 extending along the opening portion 15 so as to sandwich the opening portion 15 with the mounting seal portion 41, and the opening portion 15 A third-type seal portion R3 extending along the side edge 22 between the side edge seal portion 22a is included. As a result, as shown in FIG. 30B, the opening 15 is surrounded by the third type seal portion R3, and the opening 15 can be closed.

  On the other hand, in the example shown in FIG. 30C, the closing seal portion 42 includes a third type seal portion R3 extending along the opening portion 15 so as to sandwich the opening portion 15 with the mounting seal portion 41, and the opening portion. 1st seal part R1 extended along the side edge 22 between 15 and the side edge seal part 22a is included. Accordingly, as shown in FIG. 30C, the opening 15 is surrounded by the combination of the third type seal portion R3 and the first type seal portion R1, and the opening 15 can be closed.

(Modifications of members constituting the bag)
In the above-described first embodiment, the example in which the laminated film 10 and the lower film 13 constituting the front film 11 and the back film 12 are separate films is shown. However, it is not restricted to this, The laminated | multilayer film 10 and the lower surface film 13 may be comprised integrally. For example, as shown below, the front film 11, the back film 12, and the bottom film 13 may be configured by folding the laminated film 10.

  In this modification, first, as shown in FIG. 31, a laminated film 10 and a closing film 40 are prepared. As shown in FIG. 31, a plurality of through holes 13 e may be formed in the laminated film 10. The through hole 13e is to be a notch 13d of the bag 1 later.

  Next, a folding process for folding the laminated film 10 is performed so that two folded parts 10 c are formed on the laminated film 10. In the folding process, as shown in FIG. 32, an opening 15 is formed between one end 10 s and the other end 10 t of the laminated film 10 extending along the transport direction T, and the closing film 40 is at least in the opening 15. It is carried out so as to partially overlap. One of the two folded portions 10c is pushed inward. Thus, as shown in FIG. 32, the first film 11a and the second film 11b that face each other with the opening 15 sandwiched between the laminated film 10 and the surface film 11 through the folded-back film 10c. The configured back film 12 and the bottom film 13 configured integrally with the back film 12 and the second portion 11b can be obtained. Thereafter, an attaching step for attaching the closing film 40 to the first portion 11a, a lower edge seal portion forming step for forming the lower edge seal portion 23a, a side edge seal portion forming step for forming the side edge seal portion 22a, each film 11, The bag 1 can be obtained by carrying out a cutting step for cutting 12, 13, 40 along the shape of the outer edge of the bag 1.

  In the present modification, the order in which the steps are performed is not particularly limited. For example, the attaching process may be performed before the folding process.

(Modification of bag manufacturing method)
In the above-described first embodiment, an example in which a plurality of bags 1 are assigned to one row along the conveyance direction T of each long film has been described. However, the present invention is not limited to this, and a plurality of bags 1 may be assigned to a plurality of rows along the conveying direction T of each long film. Hereinafter, first to third modifications will be described in which a plurality of bags 1 are assigned to two rows along the conveyance direction T of each long film.

(First variation of bag manufacturing method)
First, as in the case of the first embodiment described above, a long laminated film 10 is produced (a laminated film production process (first process)). Next, as shown in FIG. 33, the elongate laminated film 10, the lower surface film 13, and the closing film 40 are prepared (a film preparation step (second step)). Here, as shown in FIG. 33, two long closing films 40 are prepared.

[Folding step (third step)]
Next, as shown in FIG. 34, a folding process is performed in which the long laminated film 10 is folded to form a folded portion 10c. Further, the long bottom film 13 is folded to form a folded portion 13c. Here, as shown in FIG. 34, two folded portions 10 c are formed on the laminated film 10, and two folded portions 13 c are formed on the lower film 13. Further, one end 10s and the other end 10t of the laminated film 10 extending along the transport direction T are close to each other, and one end 13s and the other end 13t of the bottom film 13 extending along the transport direction T are close to each other. Thus, the long surface film 11 and the long back film 12 integrally formed with the surface film 11 via the folded portion 10c are disposed between the surface film 11 and the back film 12. And two sets of film structures including the lower film 13 folded along the folded portion 13c can be obtained.

  Preferably, a gap between one end 10s and the other end 10t of the laminated film 10 and a gap between one end 13s and the other end 13t of the lower film 13 are in the normal direction of the front film 11 or the back film 12. It should be at least partially overlapping when viewed along.

  Next, as shown in FIG. 35, the attachment process (4th process) which each attaches the film 40 for closure to the inner surface 11x of the surface film 11 of each film structure is implemented. Further, as shown in FIG. 35, a lower edge seal portion forming step for forming the lower edge seal portion 23a by thermally welding the inner surface 13x of the lower film 13 to the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 ( (5th process) is implemented.

[Opening Step (Sixth Step)]
Next, using a cutter blade or the like provided so as to extend along the conveyance direction T of the long surface film 11, the surface film 11 of each film structure is transferred to the two while continuously conveying the surface film 11. An opening forming step is performed in which an elongated first portion 11a and a second portion 11b are obtained by cutting into portions, and an opening 15 is formed between the first portion 11a and the second portion 11b. . Here, as shown in FIG. 36, a portion of the surface film 11 of each film structure that overlaps the closing film 40 is at least partially cut, and an opening is formed between the first portion 11a and the second portion 11b. 15 is formed.

[Side Edge Seal Forming Step (Seventh Step)]
Next, along the portions to be the side edges 22 of the surface film 11 and the side edges 22 of the back film 12, at least partially between the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 by heat welding. A side edge seal portion forming step for forming the side edge seal portion 22a is performed. Thereby, the accommodating part S is defined inside the side edge seal part 22a and the lower edge seal part 23a.

[Division process (8th process)]
Then, the cutting process which cut | disconnects each elongate film 11,12,13,40 mutually heat-welded along the shape of the outer edge of the bag 1 is implemented. In the present modification, two folded portions 10 c are formed on the laminated film 10, and two folded portions 13 c are formed on the lower film 13. Further, as shown in FIG. 36, the closing film 40 is provided on both the first portion 11a that contacts one folded portion 10c of the two folded portions 10c and the first portion 11a that contacts the other folded portion 10c. It is attached. That is, there are two film structures for producing the bag 1 along the direction intersecting the film transport direction T. For this reason, as shown in FIG. 37, a plurality of bags 1 can be allocated to two rows along the conveying direction T of each long film. In the example shown in FIG. 37, the bag 1 includes a lower edge 23 of the bag 1 in one row and a lower edge 23 of the bag 1 in the other row, and one end 10 s of the laminated film 10. It is impositioned so as to face the gap between the other end 10t. In addition, the bag 1 has an outlet 50 of the bag 1 in one of the two rows facing the upstream side in the transport direction T, and an outlet 50 of the bag 1 in the other row is downstream in the transport direction T. It is impositioned to face the side.

(Second modification of bag manufacturing method)
In the above-described first modification shown in FIGS. 33 to 37, an example is shown in which the surface films 11 of the bags 1 assigned to the two rows are all located on the same side of the folded laminated film 10. . In this modification, an example in which the surface film 11 of the bag 1 assigned to two rows is located on a different side of the folded laminated film 10 will be described. In the following description, the description of the steps performed in the same manner as in the first modified example described above will be omitted as appropriate.

  First, the elongate laminated film 10 is produced (laminated film producing process (first process)). Next, the long laminated film 10, the lower film 13, and the closing film 40 are prepared (film preparation step (second step)). Next, as shown in FIG. 38, a folding step (third step) is performed in which the long laminated film 10 is folded to form the folded portion 10c. Then, as shown in FIG. 39, the attachment process (4th process) which each attaches the film 40 for closure to the inner surface 11x of the surface film 11 is implemented. Further, the lower edge seal portion forming step (fifth step) is performed in which the inner surface 13x of the lower film 13 is thermally welded to the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 to form the lower edge seal portion 23a. To do.

  In the attachment step (fourth step) of this modification, one closing film 40 is attached to one side of the folded laminated film 10 and another one is placed on the other side of the folded laminated film 10. A sheet of closing film 40 is attached. As a result, as shown in FIGS. 39 and 40, the surface film 11 and the back film 12 that are in contact with one of the two folded portions 10c, and the surface film 11 and the back film that are in contact with the other folded portion 10c. 12 are located on different sides.

  Next, as shown in FIG. 40, the surface film 11 is cut to form the first portion 11a and the second portion 11b, and an opening 15 is formed between the first portion 11a and the second portion 11b. A formation process (sixth process) is performed. Further, similarly to the case of the first modification, the side edge seal portion forming step (seventh step) and the dividing step (eighth step) are performed. As a result, as shown in FIG. 41, a plurality of bags 1 can be assigned to two rows along the transport direction T of each long film. In the example shown in FIG. 41, the bag 1 includes a lower edge 23 of the bag 1 in one row and a lower edge 23 of the bag 1 in the other row, and one end 10 s of the laminated film 10. It is impositioned so as to face the gap between the other end 10t. Further, the bag 1 is impositioned so that the take-out port portion 50 of the bag 1 in one row and the take-out port portion 50 of the bag 1 in the other row both face the upstream side in the transport direction T. ing.

(Third Modification of Bag Manufacturing Method)
In the first modified example shown in FIGS. 33 to 37, the lower edge 23 of the bag 1 in one row and the lower edge 23 of the bag 1 in the other row are in the transport direction T. The example in which the bags 1 are allocated so as not to overlap with each other when viewed along the line is shown. In this modified example, when the lower edge 23 of the bag 1 in one row and the lower edge 23 of the bag 1 in the other row are partially viewed from each other when viewed along the transport direction T, An example in which the bags 1 are allocated so as to overlap will be described. In the following description, the description of the steps performed in the same manner as in the first modified example described above will be omitted as appropriate.

  First, the elongate laminated film 10 is produced (laminated film producing process (first process)). Next, the long laminated film 10, the lower film 13, and the closing film 40 are prepared (film preparation step (second step)). In this modification, as shown in FIG. 42, an annular film having no cuts or edges along the transport direction T is prepared as the closing film 40.

  Next, as shown in FIG. 42, a folding step (third step) is performed in which the long laminated film 10 is folded to form the folded portion 10c. At this time, as shown in FIG. 42, the laminated film 10 is folded back so that an opening 15 is formed between one end 10 s and the other end 10 t of the long laminated film 10 extending along the transport direction T. Then, as shown in FIG. 43, the attachment process (4th process) which each attaches the film 40 for closure to the inner surface 11x of the surface film 11 is implemented. Further, the lower edge seal portion forming step (fifth step) is performed in which the inner surface 13x of the lower film 13 is thermally welded to the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 to form the lower edge seal portion 23a. To do.

  Next, as shown in FIG. 44, the first film 11a and the second film 11b are formed by cutting the surface film 11 of the film structure in which the opening 15 is not yet formed among the two sets of film structures. An opening forming process (sixth process) for forming the opening 15 between the first part 11a and the second part 11b is performed. Further, similarly to the case of the first modification, the side edge seal portion forming step (seventh step) and the dividing step (eighth step) are performed. As a result, as shown in FIG. 45, a plurality of bags 1 can be assigned to each of the two rows along the transport direction T of each long film. In the example shown in FIG. 45, the bag 1 is impositioned so that the lower edge 23 of the bag 1 in one row and the lower edge 23 of the bag 1 in the other row face each other. In addition, the bag 1 has an outlet 50 of the bag 1 in one of the two rows facing the upstream side in the transport direction T, and an outlet 50 of the bag 1 in the other row is downstream in the transport direction T. It is impositioned to face the side.

  In the present modification, the laminated film 10 is folded so that the one end 10 s and the other end 10 t of the laminated film 10 are not positioned between the two bags 1 allocated along the direction intersecting the film transport direction T. The laminated film 10 and the lower film 13 are arranged so that the opening 15 formed between the one end 10s and the other end 10t of the laminated film 10 and the lower film 13 do not overlap in a plan view. Moreover, as the lower surface film 13, an annular film having no cuts or edges is used. For this reason, as shown in FIG. 45, when the lower edge 23 of the bag 1 in one row and the lower edge 23 of the bag 1 in the other row are viewed along the transport direction T, The bags 1 can be assigned so as to partially overlap. Thereby, when producing the bag 1 using a long film, the amount of film that is wasted can be reduced.

(Modification of closing member)
In the above-described first embodiment, an example in which the closing film 40 is used as a closing member for closing the opening 15 has been described. However, the present invention is not limited to this, and a plastic molded body may be used as a closing member for closing the opening 15. The plastic molded body is obtained by molding and solidifying a synthetic resin. The method for forming the plastic molded body is not particularly limited, and a known method such as a sheet molding method, an injection molding method, an extrusion molding method, or a blow molding method is appropriately used.

  In the sheet molding method, first, a mold having a surface shape corresponding to the shape of the closing member is prepared. Next, a synthetic resin sheet that has been heated and softened is set in a mold. Thereafter, the sheet is brought into close contact with the mold using a vacuum force or a compressed air force, thereby imparting the shape of the mold to the sheet. In this way, a plastic molded body for constituting the closing member can be obtained.

  In the injection molding method, first, a mold having a surface shape corresponding to the shape of the closing member is prepared. Next, the mold is filled with a synthetic resin heated to a temperature at which it has fluidity. When the synthetic resin in contact with the mold is solidified, a plastic molded body along the surface shape of the mold can be obtained.

  In the extrusion molding method, first, a die called a die provided with holes corresponding to the cross-sectional shape of the closing member is prepared. Next, the synthetic resin is molded by extruding the synthetic resin heated to a temperature at which it has fluidity through a hole in the mold. Then, the plastic molding which has the same cross-sectional shape can be continuously obtained by cooling a synthetic resin. In the extrusion molding method, since the synthetic resin extruded from the mold is softened by heat, it can be considered that the synthetic resin is deformed before the synthetic resin is cooled and solidified. In order to suppress the occurrence of such deformation, the synthetic resin is preliminarily cooled while maintaining the shape of the synthetic resin between the mold and a cooling device for performing final cooling, for example, a water tank. A precooling step may be performed. For example, a so-called sizing die can be used to preliminarily cool the synthetic resin while suppressing the deformation of the synthetic resin. The sizing die is provided, for example, on the side surface of the water tank for performing final cooling.

Second Embodiment In the above-described first embodiment and each modification, by attaching a closing member such as the closing film 40 to the inner surface 11x of the surface film 11 so as to overlap the opening 15, The example which closes the opening part 15 was shown. However, the method of closing the opening 15 is not limited to this. Hereinafter, as the second embodiment of the present invention (hereinafter, also referred to as a second embodiment), the inner surface 11x of the first portion 11a and the inner surface 11x of the second portion 11b of the surface film 11 are thermally welded. An example of forming the closing seal portion 17 that closes the opening portion 15 formed between the first portion 11a and the second portion 11b will be described. In the following description, for parts that can be configured in the same manner as in the first embodiment described above, the same reference numerals as those used for the corresponding parts in the first embodiment described above are used. A duplicate description may be omitted.

  FIG. 46 is a front view showing the entire bag 1 according to the second embodiment. In FIG. 46, the bag 1 in a state before being filled with the fluid is shown. As in the case of the first embodiment described above, also in the second embodiment, the outer edge of the bag 1 is the upper edge 21, the lower edge 23 facing the upper edge 21, the upper edge 21 and the lower edge. A pair of side edges 22 extending between the edges 23. Further, the upper edge 21 is constituted by a folded portion 10 c formed by folding a portion of the laminated film that becomes the first portion 11 a of the surface film 11 with respect to the back film 12. And in the position where the upper edge 21 and one side edge 22 cross | intersect among the surface film 11 and the back film 12, the exit part which passes when the fluid accommodated in the accommodating part S is taken out of the bag 1 is taken out. 50 is formed. Further, the bag 1 includes a lower edge seal portion 23 a formed along the lower edge 23 and a pair of side edge seal portions 22 a formed along the pair of side edges 22. The accommodating part S in which the fluid is accommodated is defined inside the seal parts 22a and 23a.

  As shown in FIG. 46, also in the second embodiment, at least the surface film 11 out of the surface film 11 and the back film 12 has an opening 15 penetrating the surface film 11. 47A is a cross-sectional view showing a portion of the bag 1 shown in FIG. 46 where the upper edge 21 and the opening 15 are formed. 47B is a cross-sectional view showing a portion of the bag 1 shown in FIG. 46 where the upper edge 21, the outlet 50 and the side seal part 22a are formed, as shown in FIG. 47A. In the form, the bag 1 is configured such that the end portion 11ae of the first portion 11a of the surface film 11 and the end portion 11be of the second portion 11b are adjacent to each other with the opening 15 interposed therebetween. The first portion 11a and the second portion 11b are in a contact state where the inner surface 11x of the first portion 11a and the inner surface 11x of the second portion 11b are in partial contact, and the inner surface 11x and the second portion 11b of the first portion 11a. It is comprised so that the opening state in which a clearance gap is formed between the inner surface 11x of the part 11b can be taken.

  More specifically, in the second embodiment, the surface film 11 including the first portion 11a and the second portion 11b has a film length from the upper edge 21 to the end portion 11ae of the first portion 11a, The total of the film length from the end 11be of the second portion 11b to the lower edge 23 is configured to be longer than the shortest distance between the upper edge 21 and the lower edge 23. Therefore, as shown in FIG. 47A, the first portion 11a is bent or bent so that the end portion 11ae is located outside the bag 1, and similarly, the second portion is set such that the end portion 11be is located outside the bag 1. When 11b is curved or bent, a certain region (hereinafter also referred to as a first projecting region) including the end portion 11ae among the inner surface 11x of the first portion 11a of the surface film 11 and the inner surface 11x of the second portion 11b. Among these, a certain region including the end portion 11be (hereinafter also referred to as a second projecting region) comes to face each other. At this time, the inner surface 11x of the first projecting region of the first portion 11a and the inner surface 11x of the second projecting region of the second portion 11b are at least partially prevented from being thermally welded to each other. That is, an unsealed portion is present at least partially between the inner surface 11x of the first protruding region of the first portion 11a and the inner surface 11x of the second protruding region of the second portion 11b. For example, portions of the inner surface 11x of the first projecting region of the first portion 11a and the inner surface 11x of the second projecting region of the second portion 11b that do not overlap the pair of side edge seal portions 22a in plan view are defined as unsealed portions. . In this case, the inner surface 11x of the first protruding region of the first portion 11a is increased by increasing the distance between the inner surface 11x of the first protruding region of the first portion 11a and the inner surface 11x of the second protruding region of the second portion 11b. The accommodating portion S can be filled with a fluid using a gap between the inner surface 11x of the second projecting region of the second portion 11b. That is, the gap between the inner surface 11x of the first protruding area of the first portion 11a and the inner surface 11x of the second protruding area of the second portion 11b is used as the opening 15 for filling the accommodating portion S with the fluid. can do. Note that “the end 11 ae is located outside the bag 1” and “the end 11 be is located outside the bag 1” means that the inner surface 11 x of the surface film 11 faces the inner surface 12 x of the back film 12. It means that the end portion 11ae and the end portion 11be are located on the outer side (the side farther from the accommodating portion S) than the portion.

  As shown in FIG. 47B, in the first protrusion region of the first portion 11a and the second protrusion region of the second portion 11b, in the portion overlapping the pair of side edge seal portions 22a in plan view, the first portion 11a The inner surface 11x of the first projecting region and the inner surface 11x of the second projecting region of the second portion 11b may be thermally welded to form the first type seal portion R1.

(Bag manufacturing method)
Next, the manufacturing method of the bag 1 by 2nd Embodiment is demonstrated. First, as in the case of the first embodiment described above, a long laminated film 10 is produced (a laminated film production process (first process)). Next, the obtained long laminated film 10 is prepared (film preparation step (second step)).

[Folding step (third step)]
As shown next, the folding process which folds the elongate laminated film 10 and forms the folding | turning part 10c is implemented. FIG. 48 is a cross-sectional view showing a case where the long laminated film 10 is cut along a direction perpendicular to the direction perpendicular to the transport direction T of the laminated film 10. In this step, as shown in FIG. 48, the first inner plate 61 having a width larger than at least the length of the side edge 22 in the direction orthogonal to the transport direction T of the laminated film 10 is formed on the inner surface 10x of the laminated film 10. You may arrange | position upwards. Under this circumstance, as shown in FIG. 48, the long laminated film 10 is folded back along the end portion of the first inner plate 61 to form folded portions 10c at two locations. At this time, as shown in FIG. 48, the region including the one end 10s and the region including the other end 10t of the inner surface 10x of the laminated film 10 are overlapped over a certain range.

  As shown in FIG. 48, by the folding process, the laminated film 10 is placed on one side of the first inner plate 61, here, the upper surface film 11 and on the other side of the first inner plate 61, here, the lower side. It is divided into the back film 12 located. The surface film 11 includes a first portion 11a including one end 10s and a second portion 11b including the other end 10t. In order to partially align the first portion 11a of the surface film 11 with the surface of the first inner plate, the first portion 11a may be pushed in using the first outer plate 62 as shown in FIG.

[Temporary seal formation process (4th process)]
After the folding step, as shown in FIG. 48, the step of forming the temporary seal portion 16 by thermally welding the inner surface 11x of the first portion 11a and the inner surface 11x of the second portion 11b in the vicinity of the one end 10s and the other end 10t. May be implemented. As a result, the one end 10s and the other end 10t can be fixed to each other. For example, the temporary seal part 16 can be formed in the area | region of the front-end | tip vicinity of the 1st protrusion part of the 1st part 11a, and the 2nd protrusion part of the 2nd part 11b. Further, the temporary seal portion 16 may be formed so as to extend from one side edge 22 of the laminated film 10 to the other side edge 22.

[Lower edge seal forming step (fifth step)]
Thereafter, as shown in FIG. 49, the folded portion 10c between the second portion 11b and the back film 12 is pushed inward. As a result, it is possible to obtain the lower film 13 that is integrally formed with the second portion 11b and the back film 12 and in which the folded portion 13c is formed. As shown in FIG. 49, the inner surface 13x of the lower film 13 may be thermally welded to the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 to form the lower edge seal portion 23a.

[Opening Step (Sixth Step)]
Thereafter, as shown in FIG. 50, the vicinity of the one end 10s and the other end 10t of the laminated film 10 is cut so that the temporary seal portion 16 is removed, and thereby, between the first portion 11a and the second portion 11b. An opening 15 is formed in the substrate.

  Next, the side edge seal portion forming step (seventh step) and the dividing step (eighth step) are performed in the same manner as in the case of the first embodiment and the respective modifications. Thereby, the bag 1 provided with the opening part 15 formed in the unsealed part between the inner surface 11x of the 1st part 11a of the surface film 11, and the inner surface 11x of the 2nd part 11b shown in FIG. 46 can be obtained. .

(Filling method of fluid)
Next, a method for manufacturing the bag 1 in which the bag 1 is filled with the fluid and the container S is filled with the fluid will be described. First, the bag 1 manufactured as described above is prepared. Next, a filling step of filling the accommodating part S with the fluid through the opening 15 is performed. For example, as shown in FIG. 51, the bag 1 is placed on the back surface so that the gap between the inner surface 11x of the first portion 11a and the inner surface 11x of the second portion 11b of the surface film 11 is increased to realize the above-described opening state. The film 12 is bent along a portion located between the first portion 11a and the second portion 11b. Next, the fluid is filled into the accommodating portion S of the bag 1 from the nozzle of the filling device F through the opening 15. Also in the second embodiment, the opening 15 extends from one side edge seal portion 22a to the other side edge seal portion 22a. For this reason, the width | variety of the opening in the case of filling can be ensured widely.

  Next, a closing step is performed in which the inner surface 11x of the first portion 11a of the surface film 11 and the inner surface 11x of the second portion 11b are thermally welded to form the sealing portion 17 for closing. Specifically, after the above-described filling step, the folded bag 1 is returned to its original state, whereby the inner surface 11x of the surface film 11 and the inner surface 11x of the second portion 11b are in partial contact. Realize the state. Next, the inner surface 11x of the surface film 11 and the inner surface 11x of the second portion 11b are heat-welded and extend along the opening 15 as shown in FIG. 52, and include a first-type seal portion R1. A portion 17 is formed. FIG. 53 is a front view showing the bag 1 in a state where the accommodating part S is filled with a fluid and the opening 15 is closed. FIG. 53 shows an example in which the first type seal portion R1 is formed over the entire region of the first protruding region of the first portion 11a and the second protruding region of the second portion 11b. However, as long as the opening 15 can be closed and the bag 1 can be sealed, that is, as long as the closing seal portion 17 is formed from one side edge seal portion 22a to the other side edge seal portion 22a. In this case, the first type seal portion R1 may not be formed over the entire region of the first projecting region of the first portion 11a and the second projecting region of the second portion 11b.

  As described above, in the bag 1 according to the second embodiment, at least the surface film 11 has the openings 15 penetrating the surface film 11, and the inner surface 11 x of the first portion 11 a and the second portion 11 b of the surface film 11. It is formed between the inner surface 11x. For this reason, the accommodation part S of the bag 1 can be filled with a fluid through the opening 15 formed in the surface film 11. Moreover, after filling the accommodating part S of the bag 1 with the fluid, the inner surface 11x of the first part 11a and the inner surface 11x of the second part 11b of the surface film 11 are thermally welded to form the sealing part 17 for closing. Thus, the opening 15 formed in the surface film 11 can be closed. Therefore, even when the outlet 50 is formed in the upper part of the bag 1, a wide opening width can be secured during filling. Thereby, the bag 1 which is excellent in fluid filling suitability and has the outlet 50 can be provided.

  Also in the second embodiment, the outlet 50 is formed between the folded portion 10c of the upper edge 21 and the outlet seal 36 as in the case of the first embodiment described above. Yes. For this reason, a large amount of fluid can be present in the outlet portion 50 when the fluid is taken out. Thereby, the rigidity of the outlet 50 can be sufficiently secured, and this can prevent the outlet 50 from being blocked during the extraction of the fluid. Moreover, it can suppress that the taking-out part 50 bends in the middle of taking out a fluid.

(Modifications of members constituting the bag)
In the above-described first and second embodiments and their modifications, the single laminated film 10 folded along the folded portion 10 c is formed by the first portion 11 a of the front film 11 and the back film 12. The example which comprises the whole area was shown. However, as long as the upper edge 21 includes a folded portion 10c formed by folding the laminated film 10 constituting at least a part of the surface film 11 and at least a part of the back film 12, the front film 11 and the back surface The relationship between the film 12 and the laminated film 10 is not particularly limited. For example, as shown in FIG. 54, the back film 12 constituting the bag 1 includes a first portion 12a located on the upper side of the bag 1 and a second portion 12b located on the lower side of the bag 1. Also good. In this case, the upper edge 21 includes a folded portion 10 c formed by folding the laminated film 10 constituting the first portion 11 a of the front film 11 and the first portion 12 a of the back film 12.

  The method for connecting the first portion 12a and the second portion 12b of the back film 12 is not particularly limited, and various methods can be adopted. For example, as shown in FIG. 55, the outer surface 12y of the first portion 12a of the back film 12 and the inner surface 12x of the second portion 12b are heat-welded to form a connecting seal portion 18a, whereby the first portion 12a and the first portion 12a The two portions 12b may be connected. In this case, at least a portion of the first portion 12a of the back film 12 where the coupling seal portion 18a is formed may be constituted by a thermoplastic resin layer. Moreover, when the part in which the sealing part 18a for connection is formed among the 1st parts 12a of the back surface film 12 is comprised by the base material layer 52, heat welding is performed at temperature higher than melting | fusing point of the base material layer 52. You may implement.

  Moreover, as shown in FIG. 56, the first portion 12a and the second portion 12b of the back film 12 may be coupled using a coupling film 18b. As a method of fixing the connecting film 18b to the first portion 12a and the second portion 12b, for example, heat welding can be employed. 56 shows an example in which the connecting film 18b is fixed to the inner surface 12x of the first portion 12a and the inner surface 12x of the second portion 12b. However, the present invention is not limited to this, and although not shown, The film 18b may be fixed to the outer surface 12y of the first portion 12a and the outer surface 12y of the second portion 12b.

  Moreover, in the above-mentioned FIG. 55 and FIG. 56, the example in which the outer surface 12y of the 1st part 12a of the back film 12 and the inner surface 12x of the 2nd part 12b were partially connected was shown. However, the present invention is not limited to this, and although not shown, the inner surface 12x of the first portion 12a of the back film 12 and the outer surface 12y of the second portion 12b may be partially connected.

(Modification in the direction in which the upper edge and the opening extend)
In the above-described first and second embodiments and their modifications, the upper edge 21 and the opening 15 extend substantially parallel to each other, and the direction in which the upper edge 21 and the opening 15 extend is the lower edge 23. The example which inclined at a predetermined angle with respect to the direction which extends is shown. However, as long as the upper edge 21 includes the laminated film 103 and the opening 15 is formed in the surface film 11, the direction in which the upper edge 21 and the outlet 50 extend is not particularly limited.

  For example, as shown in FIG. 57, the folded portion 10 c of the upper edge 21 may be inclined at a predetermined angle with respect to the opening 15. In this case, the opening 15 and the lower edge 23 may extend substantially parallel to each other.

  As shown in FIG. 58, the folded portion 10c of the upper edge 21, the opening 15 and the lower edge 23 may extend substantially in parallel to each other.

(Modification of outlet)
In the above-described first and second embodiments and modifications thereof, an example in which the outlet 50 is formed on the side edge 22 side of the pair of side edges 22 is shown. However, the present invention is not limited to this, and the outlet 50 may be formed on both the side edge 22 side and the other side edge 22 side.

  In addition, although the some modification with respect to the 1st and 2nd embodiment mentioned above has been described, naturally, it is also possible to apply a combination of a plurality of modifications appropriately.

1 bag 10 laminated film 10c folded part 10s one end 10t other end 11 surface film 11a first part 11b second part 12 back film 13 bottom film 13c folded part 13d notch 13e through hole 13s one end 13t other end 15 opening 15a connecting part 15b Unsealed portion 16 Temporary seal portion 17 Closing seal portion 18a Linking seal portion 18b Linking film 21 Upper edge 22 Side edge 22a Side edge seal portion 23 Lower edge 23a Lower edge seal portion 35 Planned opening portion 36 Exit seal portion 37 Notch 38 Notch 40 Closing film 41 Mounting seal part 42 Closing seal part 43 Through-hole 50 Outlet part 51 Thermoplastic resin layer 52 Base material layer 53 Second thermoplastic resin layer 56 First layer 57 Second layer 61 First inner plate 62 First outer plate

Claims (15)

A bag formed with a container filled with fluid,
At least a front film and a back film,
The outer edge of the bag includes an upper edge, a lower edge facing the upper edge, and a pair of side edges extending between the upper edge and the lower edge,
The upper edge includes at least partially a folded portion formed by folding a laminated film constituting at least a part of the front film and at least a part of the back film,
The surface film and the back film are formed with an outlet portion through which the fluid flowing along the folded portion of the upper edge is taken out,
The accommodating portion is defined inside a seal portion formed between the inner surface of the surface film and the inner surface of the back film by heat welding along the lower edge and the pair of side edges of the bag,
Among the surface film and the back film, at least the surface film has an opening penetrating the surface film formed at least partially at a position inside the seal portion defining the housing portion. And
The bag further comprises a closing member attached to the inner surface of the surface film so as to at least partially overlap the opening.
The closing member includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface,
The bag, wherein the first layer constituting the first surface of the closing member is at least partially made of a material that can be thermally welded to the inner surface of the surface film. The second layer constituting the second surface of the closing member is made of a material having a higher melting point than the material constituting the first layer of the closing member, or
The bag according to claim 1, wherein an inhibitor is provided on the second surface of the closing member to prevent thermal welding from occurring between the inner surface of the back film. A bag formed with a container filled with fluid,
At least a front film and a back film,
The outer edge of the bag includes an upper edge, a lower edge facing the upper edge, and a pair of side edges extending between the upper edge and the lower edge,
The upper edge includes at least partially a folded portion formed by folding a laminated film constituting at least a part of the front film and at least a part of the back film,
The surface film and the back film are formed with an outlet portion through which the fluid flowing along the folded portion of the upper edge is taken out,
The surface film includes at least a first part and a second part adjacent to each other with an opening penetrating the surface film,
The first portion and the second portion are in a contact state in which the inner surface of the first portion and the inner surface of the second portion are in partial contact, and the inner surface of the first portion and the inner surface of the second portion The bag is configured so as to have an open state in which a gap is formed between the two.   The bag according to any one of claims 1 to 3, wherein the folded portion of the upper edge is formed in an arc shape. The distance from the lower edge to the upper edge is at least partially reduced from one side edge to the other side edge of the pair of side edges,
The bag according to any one of claims 1 to 4, wherein the outlet portion is formed on a side of the one side edge of the pair of side edges of the front film and the back film.   The opening portion is formed with a planned opening portion that becomes an outlet when opened, and the fluid that has flowed along the folded portion is taken out from the outlet. The bag according to any one of the above. The opening is formed in the surface film so as to reach from one side edge of the pair of side edges to the other side edge,
The bag according to any one of claims 1 to 6, wherein the upper edge extends substantially parallel to the opening. A method of manufacturing a bag in which a container filled with a fluid is formed,
The accommodating portion is defined inside a seal portion formed between the inner surface of the surface film and the inner surface of the back film by heat welding along the lower edge and a pair of side edges of the bag,
The manufacturing method of the bag is as follows:
Preparing a laminated film including a thermoplastic resin layer constituting an inner surface and a base material layer;
Folding the laminated film to form a folded portion, at least a portion of the surface film, and at least a portion of the back film integrally formed with at least a portion of the surface film via the folded portion Obtaining a folding step;
Attaching a closing member to the inner surface of the surface film;
Forming the seal portion to define the housing portion, and
Of the surface film and the back film on which the seal portion is formed, at least the surface film has an opening penetrating the surface film,
The closing member is attached to the inner surface of the surface film so as to at least partially overlap the opening;
The closing member includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface,
The bag manufacturing method, wherein the first layer constituting the first surface of the closing member is at least partially made of a material that can be thermally welded to the inner surface of the surface film. A bag filled with fluid in the container,
At least a front film and a back film,
The outer edge of the bag includes an upper edge, a lower edge facing the upper edge, and a pair of side edges extending between the upper edge and the lower edge,
The upper edge includes at least partially a folded portion formed by folding a laminated film constituting at least a part of the front film and at least a part of the back film,
The surface film and the back film are formed with an outlet portion through which the fluid flowing along the folded portion of the upper edge is taken out,
The accommodating portion is defined inside a seal portion formed between the inner surface of the surface film and the inner surface of the back film by heat welding along the lower edge and the pair of side edges of the bag,
Each of the surface film and the back film includes a base material layer, and a thermoplastic resin layer provided on the base material layer and constituting the inner surface of the surface film,
Of the surface film and the back film, at least the surface film has an opening formed at a position inside the seal portion that defines the housing portion,
In the opening, at least the base material layer is divided,
The bag further comprises a closing member attached to the inner surface of the surface film so as to at least partially overlap the opening.
The closing member includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface,
Between the first surface of the closing member and the inner surface of the surface film, a seal portion is formed at least partially by heat welding,
The opening is formed by the seal portion between the first surface of the closing member and the inner surface of the surface film, or between the first surface of the closing member and the inner surface of the surface film. The bag surrounded by the combination of the seal portion between the seal portion and the inner surface of the front film and the inner surface of the back film. A method for producing a bag in which a container is filled with a fluid,
Preparing the bag of claim 1;
A filling step of filling the container with a fluid through the opening;
A closing step of forming a seal portion by at least partially heat welding the first surface of the closing member and the inner surface of the surface film;
In the closing step, the opening is formed by a seal portion formed by heat welding between the first surface of the closing member and the inner surface of the surface film, or the opening of the closing member. A seal part formed by heat welding between the first surface and the inner surface of the surface film and formed by heat welding between the inner surface of the surface film and the inner surface of the back film. The manufacturing method of a bag implemented so that it may be enclosed by the combination of a seal part. A method for producing a bag in which a container is filled with a fluid,
A preparation step of preparing a bag in which an opening is formed;
A filling step of filling the container with a fluid through the opening;
A closing step of closing the opening,
The accommodating portion is defined inside a seal portion formed between the inner surface of the surface film and the inner surface of the back film by heat welding along the lower edge and a pair of side edges of the bag,
The preparation step includes
Preparing a laminated film including a thermoplastic resin layer constituting an inner surface and a base material layer;
Folding the laminated film to form a folded portion, at least a portion of the surface film, and at least a portion of the back film integrally formed with at least a portion of the surface film via the folded portion Obtaining a folding step;
Attaching a closing member to the inner surface of the surface film;
Forming the seal portion to define the housing portion, and
Of the surface film and the back film on which the seal portion is formed, at least the surface film has an opening penetrating the surface film,
The closing member is attached to the inner surface of the surface film so as to at least partially overlap the opening;
The closing member includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface,
The first layer constituting the first surface of the closing member is at least partially made of a material that can be thermally welded to the inner surface of the surface film,
In the closing step, the opening is formed by a seal portion formed by heat welding between the first surface of the closing member and the inner surface of the surface film, or the opening of the closing member. A seal part formed by heat welding between the first surface and the inner surface of the surface film and formed by heat welding between the inner surface of the surface film and the inner surface of the back film. The manufacturing method of a bag implemented so that it may be enclosed by the combination of a seal part. A method of manufacturing a bag in which a container filled with a fluid is formed,
The accommodating portion is defined inside a seal portion formed between the inner surface of the surface film and the inner surface of the back film by heat welding along the lower edge and a pair of side edges of the bag,
The manufacturing method of the bag is as follows:
Preparing a laminated film including a thermoplastic resin layer constituting an inner surface and a base material layer;
Folding the laminated film to form a folded portion, at least a portion of the surface film, and at least a portion of the back film integrally formed with at least a portion of the surface film via the folded portion Obtaining a folding step;
Forming the seal portion to define the housing portion, and
The surface film includes at least a first part and a second part adjacent to each other with an opening penetrating the surface film,
The first portion and the second portion are in a contact state in which the inner surface of the first portion and the inner surface of the second portion are in partial contact, and the inner surface of the first portion and the inner surface of the second portion The bag is configured so as to have an open state in which a gap is formed between the two. A bag filled with fluid in the container,
At least a front film and a back film,
The outer edge of the bag includes an upper edge, a lower edge facing the upper edge, and a pair of side edges extending between the upper edge and the lower edge,
The upper edge includes at least partially a folded portion formed by folding a laminated film constituting at least a part of the front film and at least a part of the back film,
The surface film and the back film are formed with an outlet portion through which the fluid flowing along the folded portion of the upper edge is taken out,
Each of the surface film and the back film includes a base material layer, and a thermoplastic resin layer provided on the base material layer and constituting an inner surface of the surface film,
The surface film includes at least a first portion and a second portion that are adjacent to each other with an opening interposed therebetween,
In the opening, at least the base material layer is divided,
A bag in which a sealing part for closing is formed by heat welding between the inner surface of the first part and the inner surface of the second part. A method for producing a bag in which a container is filled with a fluid,
Preparing the bag according to claim 3;
A filling step of filling the container with a fluid through the opening;
And a closing step in which the inner surface of the first portion of the surface film and the inner surface of the second portion are heat-welded to form a sealing portion for closing. A method for producing a bag in which a container is filled with a fluid,
A preparation step of preparing a bag in which an opening is formed;
A filling step of filling the container with a fluid through the opening;
A closing step of closing the opening,
The accommodating portion is defined inside a seal portion formed between the inner surface of the surface film and the inner surface of the back film by heat welding along the lower edge and a pair of side edges of the bag,
The preparation step includes
Preparing a laminated film including a thermoplastic resin layer constituting an inner surface and a base material layer;
Folding the laminated film to form a folded portion, at least a portion of the surface film, and at least a portion of the back film integrally formed with at least a portion of the surface film via the folded portion Obtaining a folding step;
Forming the seal portion to define the housing portion, and
The surface film includes at least a first part and a second part adjacent to each other with an opening penetrating the surface film,
In the closing step, a bag sealing method is formed in which a sealing part for closing is formed by thermally welding the inner surface of the first portion and the inner surface of the second portion of the surface film.

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