JP2014080226A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag which has a reinforced joint portion of a vertical seal and folding part seal and copes with heavy objects.SOLUTION: The packaging bag comprises:a pair of outer peripheral sheet parts 2a,2b; and a folded sheet part 4 folded into between the outer peripheral sheet parts 2a and 2b. And a vertical seals 5 formed by fusion of facing side edge parts of the outer peripheral sheet parts 2a and 2b and a pair of folding part seals 6, 6 formed by fusion of facing side edge parts of the outer peripheral sheet parts and the folded sheet part are included in a bag body 8 included in the packaging bag.And a vertical reinforcement seal part 13 formed by fusion of facing surfaces of the outer peripheral sheet parts inside the vertical seals 5 and a reinforcement seal 12 formed by reinforcement seal parts 14,14 formed by fusion of facing surface of the facing outer peripheral sheet parts of the folding part seals and the folded sheet part are formed extending over the vertical seal 5 and the folding part seals 6,6.

Description

  The present invention relates to a packaging bag used mainly for transporting precision parts such as electrodes for lithium ion batteries.

  Conventionally, when transporting precision parts such as electrodes for lithium-ion batteries from a manufacturing plant, rolls around which many precision parts are wound are wrapped in a synthetic resin film packaging bag to prevent deterioration of the precision parts due to moisture. I am doing so.

  This type of packaging bag includes a pair of outer peripheral sheet portions arranged in an overlapping manner, and a folded sheet portion folded between both outer peripheral sheet portions in a state of being folded through a fold. By forming a vertical seal formed by fusing the side edges facing each other and a folded part seal formed by fusing the side edges facing each other between the outer peripheral sheet part and the folded sheet part, It is known that when used, it is folded to form a sheet, and when used, a body having a rectangular bottom is formed, and a roll or the like around which an electronic component is wound can be accommodated in the body.

  In this packaging bag, both outer peripheral sheet portions are spread away from each other, the folded sheet portion is expanded, and both sides of the folded sheet portion rise in a triangular shape, and the triangular raised portion together with the outer peripheral sheet portion The outer periphery of the trunk is configured (see, for example, Patent Document 1).

JP 2001-278339 A

  However, in the conventional technology as described above, when a heavy object such as a roll around which an electronic component is wound is accommodated in the body portion and a load is applied to the bottom surface portion, the load is applied to the vertical seal via the triangular rising portion. Since the stress is transmitted in the direction of peeling each seal to the joint portion with the folding portion seal, there is a possibility that a part of the vertical seal or the folding portion seal is peeled off and a hole is formed in the joint portion.

  In view of such a conventional problem, the present invention has been made for the purpose of providing a packaging bag that can reinforce a joint portion between a vertical seal and a fold-in seal and can handle heavy objects.

  The feature of the invention according to claim 1 for solving the conventional problems as described above and achieving the intended purpose is that a pair of outer peripheral sheet portions in an overlapping arrangement and a state of being folded through a crease. A vertical seal comprising a folded sheet portion folded between the two outer peripheral sheet portions, the side edge portions of the outer peripheral sheet portions facing each other, and the outer peripheral sheet portion continuous with the vertical seal. And a pair of folding part seals formed by fusing the side edge parts facing each other between the folding sheet part and the folding sheet part. A longitudinal reinforcing seal portion formed by fusing the opposed surface portions of the sheet portion; an outer peripheral sheet portion opposed to each other inside the folded portion seal; and a folded reinforced seal portion formed by fusing between the opposed surface portions of the folded sheet portion; Kara The reinforced seal is formed across the vertical seal and the fold-in seal.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the reinforcing seal is formed based on a stress analysis by a finite element method.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the reinforcing seal has a shape in which an edge of the vertical reinforcing seal portion is inclined inward continuously from an inner edge of the vertical seal. And the edge portion of the folding reinforcing seal portion is formed in a shape that is inclined inward continuously from the inner edge of the folding portion seal.

  According to a fourth aspect of the present invention, in addition to the structure of the first, second, or third aspect, the folding sheet portion is a fusion made of a fusible material disposed on the side facing the outer peripheral sheet portion. The present invention has a multilayer structure including a layer and a hard-to-fuse layer made of a material that is difficult to fuse and is disposed on the side where they are overlapped with each other.

  According to a fifth aspect of the present invention, in addition to the configuration of the first to third or fourth aspects, the bag base body is obliquely cut out on both sides of a portion where the outer peripheral sheet portion and the folded sheet portion overlap each other. It is to be formed into a shape.

  According to a sixth aspect of the present invention, in addition to the structure of the first to fourth or fifth aspects, the bag base has an opening at an end opposite to the folded sheet portion of the outer peripheral sheet portions. And a hermetically sealed chuck in an arrangement across the opening.

  According to a seventh aspect of the present invention, in addition to the configuration of the sixth aspect, the sealed structural chuck is a pair of tape-like synthetic resins that are fixed to the opposing surfaces in the opening of the bag base. A female seal comprising a pair of female ridges having a base part and having a hook-and-mouth part projecting inwardly at the tip part and projecting integrally on the surface of one of the base parts And a pair of hook-shaped cross-sections that are integrally provided on the surface of the other base part, have a claw part protruding outward at the tip part, and inserted between the female ridges. And a male sealing body composed of a male ridge, and is integrally projected at an intermediate position between the female ridges of the one base part, and both male ridges of the other base part. A sealing protrusion that is press-fitted in between, and by inserting the male sealing body into the female sealing body, the claws between the two are engaged with each other. The sealing ridges with is that made so as to be press-fitted between the back of the Okagi ridges.

  As described above, the packaging bag according to the present invention includes a pair of outer peripheral sheet portions arranged in an overlapping manner, and a folded sheet portion folded between the two outer peripheral sheet portions in a state of being folded through a fold, The vertical seal formed by fusing the opposite side edge portions of the outer peripheral sheet portions and the opposite side edge portions of the outer peripheral sheet portion and the folded sheet portion continuous with the vertical seal are fused. In the packaging bag having a bag base formed by forming a pair of folded-in part seals, a longitudinal reinforcing seal part formed by fusing the opposing surface parts of the two outer peripheral sheet parts facing each other inside the vertical seal; A reinforced seal composed of an outer peripheral sheet portion facing each other inside the fold portion seal and a fold reinforcing seal portion formed by fusing between the opposing surface portions of the fold sheet portion is a vertical seal and the fold portion sheet. As a result, the fusion area is expanded compared to the case of only the vertical seal and the fold-in part seal against the stress acting in the direction of peeling the seal, thereby strengthening the vertical reinforced seal part and both folds. The seal portion resists stress acting in the direction in which the vertical seal and the folded portion seal are peeled off, prevents the vertical seal and the folded portion seal from being peeled off, and maintains the sealed state.

  In the present invention, the reinforced seal is formed based on stress analysis by a finite element method, so that the reinforced seal can be formed in an optimal shape.

  Furthermore, in the present invention, the reinforcing seal is formed in a shape in which the edge of the vertical reinforcing seal portion is inclined inward continuously from the inner edge of the vertical seal, and the edge of the folding reinforcing seal portion is folded. This prevents the stress from concentrating on the joint between the reinforced seal and each seal when the packaging bag is unfolded. it can.

  Further, in the present invention, the folding sheet portion includes a fusion layer made of a fusible material disposed on a side facing the outer peripheral sheet portion, and a material that is difficult to fuse disposed on a side where they are overlapped with each other. By having a multi-layered structure comprising a hardly fusible layer made of the above, it is possible to make the packaging bag suitably expandable without being fused between the two folded reinforcing seal portions.

  Furthermore, in the present invention, the bag base is formed into a shape in which both sides of the portion where the outer peripheral sheet portion and the folded sheet portion overlap are obliquely cut out, thereby expanding the bag base. At this time, both sides of the folded sheet portion can be formed in a triangular shape.

  Further, in the present invention, the bag base has an opening at the end opposite to the folded sheet portion of the outer peripheral sheet portions, and a sealed structural chuck is provided so as to cross the opening. The inside can be sealed without using a sealer and can be reused.

  Furthermore, in the present invention, the sealed structural chuck includes a pair of base parts made of a synthetic resin in the form of a tape fixed to each facing surface in the opening of the bag base, and one of the base parts And a female sealing body comprising a pair of female hook protrusions having a hook-shaped claw portion protruding inwardly at the tip portion, and the surface of the other base portion And a male sealing body comprising a pair of male ridges having a hook-like cross section inserted between the female ridges. And a projecting protrusion that is integrally projected at an intermediate position between the female female protrusions of the one base part and is press-fitted between the male male protrusions of the other base part, By inserting the male sealing body into the female sealing body, the claws between the two are engaged with each other and the sealing protrusion is By becoming so as to be press-fitted between the back of the Kiyukagi ridges, it can exhibit high sealability.

It is a top view at the time of unused which shows an example of the packaging bag which concerns on this invention. It is sectional drawing which shows the state of the folding sheet | seat part in FIG. It is a perspective view which shows the use condition of the packaging bag which concerns on this invention. It is sectional drawing which shows the state of the synthetic resin film in FIG. FIG. 2 is an enlarged plan view showing a reinforced seal portion in FIG. 1. It is a perspective view for demonstrating the shape of a reinforcement seal same as the above, (a) is the shape of the state seen from the bag outer side, (b) is the shape of the state seen from the bag inner side. It is a perspective view which shows an example of the sealing structure type chuck | zipper in FIG. It is an expanded sectional view which shows the chuck | zipper part in FIG.

  Next, an embodiment of the packaging bag according to the present invention will be described based on the examples shown in FIGS. In addition, the code | symbol 1 is a packaging bag in the figure, and FIG. 1 is a top view which shows the folded state when the packaging bag 1 is unused.

  The packaging bag 1 is composed of a synthetic resin film, and a pair of outer peripheral sheet portions 2a and 2b arranged in a superposed manner, and a folded sheet folded between the outer peripheral sheet portions 2a and 2b in a state of being folded through a crease 3. A vertical seal 5 formed by fusing the side edges of the outer peripheral sheet portions 2a and 2b facing each other, and the sides of the outer peripheral sheet portions 2a and 2b and the folded sheet portion 4 facing each other. Folding part seals 6 and 6 formed by fusing the edges and bottom seals 7 and 7 formed by fusing the ends of the outer peripheral sheet parts 2a and 2b and the folding sheet part 4 facing each other are formed. When the bag base 8 is not used, it forms a sheet. When the bag base 8 is used, as shown in FIG. 3, both sides of the folded sheet portion 4 rise into triangular shapes 8a and 8a, and are rectangular. Body with bottom surface 8b There has been so formed.

  The bag base 8 is formed in a shape in which both side portions of the portion where the outer peripheral sheet portions 2a and 2b and the folded sheet portion 4 are overlapped are obliquely cut out, and the folded portion seals 6 and 6 are formed along the cut portions. Are formed in an oblique direction.

  The synthetic resin film constituting the bag base 8 is a single-layer or multi-layer synthetic resin film that can be fused, and an optimum material is appropriately selected according to the contents to be used. As shown in FIG. 4, the synthetic resin film has an outermost layer which is difficult to heat-bond 9 made of PET (polyethylene terephthalate), an intermediate layer 10 made of nylon or the like, and an innermost layer. A multilayer structure having three or more layers in which a heat-sealable fusion layer 11 made of a polyethylene film or the like is arranged is preferable.

  A pair of synthetic resin films having such a multilayer structure are overlapped with the fusion layer 11 side inward to form a pair of outer peripheral sheet portions 2a and 2b facing each other, and between the outer peripheral sheet portions 2a and 2b. Folding sheet part 4 which consists of a pair of fold parts 4a and 4b is formed by folding up one end part so that the fusion layer 11 side may become the outside via crease 3 and folding the synthetic resin film in that state. The

  As a result, the fusion layer 11 is disposed on each of the facing surface portions of the outer peripheral sheet portions 2a and 2b and the portions of the outer peripheral sheet portions 2a and 2b and the folding sheet portions 4a and 4b that are opposed to each other. Between the folding portions 4a and 4b of the sheet portion 4 facing each other, the hardly fusible layer 9 is arranged on each facing surface portion.

  In this state, the side edges of the two outer peripheral sheet portions 2a and 2b that overlap each other and the peripheral edge portion of the portion where the outer peripheral sheet portions 2a and 2b overlap the folded portions 4a and 4b of the folding sheet portion are paired with a pair of heating elements that constitute the sealer. By sandwiching between the pressing bodies and heating in a state of being pressed by the heating pressing body from the outside of both outer sheet portions 2a, 2b, between the opposing surface portions of the outer peripheral sheet portions 2a, 2b facing each other and the outer peripheral sheet portions facing each other The opposing surface portions of 2a and 2b and the folded sheet portion 4 are fused to form the vertical seal 5, the folded portion seals 6 and 6, and the bottom seals 7 and 7, respectively.

  In addition, the joint portions of the vertical seal 5 and the folding seals 6 and 6 are formed such that the fusion layers 11 and 11 constituting each seal are melted together to be continuous with no gap.

  On the other hand, since the hardly-fusible layers 9 and 9 are arranged between the opposing surface portions of the fold portions 4a and 4b facing each other of the fold sheet portion 4, they are not fused, and between the fold portion seals 6 and 6, The bottom seals 7 and 7 are not fused and formed in shapes independent of each other.

  Further, a reinforcing seal 12 for reinforcing the joint portion between the vertical seal 5 and the folding seals 6 and 6 is formed on the bag base 8 based on a stress analysis by a finite element method. The optimum shape and area are set as appropriate in accordance with the assumed contents.

  As shown in FIGS. 5 and 6, the reinforcing seal 12 has a three-pronged shape extending over the vertical seal 5 and the folding portion seals 6 and 6, and the outer peripheral surface portions 2 a and 2 b and the outer surface portion of the folding sheet portion 4. Are formed in a shape that is narrowed toward the inside, and the longitudinal reinforcing seal portion 13 is formed by fusing the opposing surface portions of the outer peripheral sheet portions 2a, 2b facing each other inside the vertical seal 5, and each folding portion seal 6 , 6 and a pair of folding reinforcing seal portions 14, 14 formed by fusing the opposing surface portions of the folding sheet portions 4 with the outer peripheral sheet portions 2a, 2b facing each other and the folding sheets 4a, 4b. Yes.

  The vertical reinforcing seal portion 13 is formed integrally with the vertical seal 5, and has a shape inclined to the inward folding sheet portion 4 side so that the inner edge portion 13 a continues through a gentle arc shape from the inner edge of the vertical seal 5. That is, it is formed in a right-angled triangular shape in plan view with the inner side surface portion as the hypotenuse, and has a shape in which stress is not concentrated on the joint portion between the vertical seal 5 and the vertical reinforcing seal portion 13.

  Note that the angle α formed by the inner edge 13a of the vertical seal 5 and the inclined inner edge 13a of the vertical reinforcing seal portion 13 can exhibit sufficient strength against the stress acting in the direction in which the vertical reinforcing seal portion 13 peels off the seal. The shape and area can be ensured, and the shape is set so as not to obstruct the expansion of the outer peripheral sheet portions 2a and 2b, and preferably α = 150 to 170 degrees.

  On the other hand, each fold reinforcing seal part 14, 14 is formed integrally with each fold seal 6, 6, a part 14 a in which the inner edge is continuous with the oblique side part 13 a of the vertical reinforced seal part 13, and the fold seal 6, 6. A portion 14b that is continuously inclined inward via a gentle arc from the inner edge of 6 is formed in a continuous shape via a gentle arc.

  It should be noted that the inner edges 14b of the folding part seals 6 and 6 and the inner edge part 14b of the folding reinforcing seal parts 14 and 14 are formed in a continuous shape through a gentle arc shape so that the folding part seals 6 and 6 and the folding reinforcing seals are connected. The stress is not concentrated on the joint portion between the portions 14 and 14.

  The angle β formed by the inner edges 14b of the folding seals 6 and 6 and the inner edge 14b of the folding reinforcing seal 14 has a sufficient strength against the stress acting in the direction in which the folding reinforcing seals 14 and 14 peel off the sealing. A shape and an area that can be exhibited can be ensured, and the shape is set so as to be a shape that does not hinder the spread of the folded sheet portion 4, and preferably β = 80 to 100 degrees.

  The reinforced seal 12 is formed in the shape of the reinforced seal 12 from the outside of the outer sheet portions 2a and 2b in a state where the outer peripheral sheet portions 2a and 2b and the folded portions 4a and 4b of the folded sheet portion 4 are overlapped. It forms by heating in the state pressurized with the corresponding heat press body for reinforcement | strengthening seals.

Thus, by heating in a state of being pressurized by the reinforced seal heating pressing body, the outer peripheral sheets facing each other between the opposing surface portions of the outer peripheral sheet portions 2a and 2b facing each other inside the vertical seal 5 and inside the folding portion seal 7 are heated. The opposing surface portions of the portions 2a and 2b and the folded sheet portion 4 are fused in conformity with the shape of the reinforcing seal 12, and the joint portion between the vertical reinforcing seal portion 13 and the folded reinforcing seal portions 14 and 14 is connected to each seal portion 13. , 14 are fused together to be integrated with each other without gaps.
Further, at that time, since the hardly-fusible layers 9 and 9 are arranged between the opposing surface portions of the fold portions 4a and 4b facing each other of the fold sheet portion 4, the fold reinforcing seal portions 14 and 14 are not fused. 14 are formed in a shape independent from each other without being fused.

  The reinforcing seal heat pressing body is formed integrally with the heat pressing body for forming the vertical seal 5 and the folding portion seals 6 and 6, and the vertical seal 5, the folding portion seals 6 and 6 and the reinforcing seal 12 are simultaneously formed. You may make it form.

  In addition, the packaging bag 1 has an opening formed at the end of the bag base 8 opposite to the folding sheet portion 4, and a sealing structure type chuck 20 is provided so as to cross the opening.

  The sealed structural chuck 20 includes a pair of chuck portions 20a and 20b arranged in parallel with each other between a pair of tape-like base portions 21a and 21b.

  The two chuck portions 20a and 20b have the same structure, and as shown in FIGS. 7 and 8, the female sealing body 22 and the other base portion which are integrally projected on the surface of one base portion 21a. Sealing is performed by fitting a male sealing body 23 projecting integrally with 21b.

  The female sealing body 22 is provided with a pair of female ridge ridges 25 and 26 having a bowl-shaped cross section having a female ridge claw portion 24 projecting inwardly at a distal end portion thereof. Yes. The male sealing body 23 is integrally projected on the surface of the other base portion 21b, has a claw portion 27 protruding outward at the tip portion, and is provided inside each female ridge 25, 26. A pair of male rod ridges 28 and 29 having a bowl-shaped cross section are inserted.

  In addition, a sealing protrusion 30 that is press-fitted between the male protrusions 28 and 29 of the other base part 21a and 21b is integrally formed at an intermediate position between both female protrusions 25 and 26 of the one base part 21a. By inserting the male sealing body 23 into the female sealing body 22, both claws 24 and 27 are engaged with each other, and the sealing ridge 30 is formed by both male ridges. 28 and 29 are press-fitted between the back surfaces.

  The sealing ridge 30 includes a head having a shape in which both sides are bulged at a tip portion thereof, and both side surfaces of the head are brought into line contact with each other by pressing the back surfaces of both male ridges 28 and 29, Gas-liquid tightness is maintained.

  Further, the cross-sectional shape of the base portion of one female ridge ridge 25 of the female sealing body 22 is formed into a taper shape that increases in thickness toward the base portion 21a side, and thereby the female ridge ridge 25 protrudes. The bending force with respect to the installed base 21a is easily transmitted to the female ridge 25, and therefore the female ridge 25 is easily separated from the male ridge 28 by bending the base 21a outward. It is possible to easily remove the claw portions 24 and 27 that are bent in the direction and are engaged with each other.

  On the other hand, the base portion of the other female ridge ridge 26 has a shape curved toward the one ridge ridge 25 side in the same manner as the inner surface as its outer surface reaches the base portion 21a. The base portion has an arc-shaped portion whose thickness is formed to be thicker than the thickness of the base portion 21a and whose cross-sectional shape is formed in an arc shape.

  For this reason, when a bending force in the opening direction acts on the base portion 21 a, the base portion 21 a bends at the position outside the root portion of the female ridge ridge 26, and the bending force is easily transmitted to the female ridge 26. Therefore, the claw portions 24 and 27 that are engaged with each other are not easily disengaged.

  Each of the chuck portions 20a and 20b having the above structure is integrally protruded with respect to the base portions 21a and 21b with the female ridge 26 facing the same inner side.

  When the packaging bag 1 configured in this manner is expanded from the sheet state shown in FIG. 1 so that both outer peripheral sheet portions 2a and 2b form a cylindrical shape as shown in FIG. 3, the folded sheet portion 4 is expanded accordingly. In addition, a rectangular bottom surface portion 8b is formed, both side portions of the folding sheet portion 4 are raised in a triangular shape, and the triangular rising portions 8a and 8a are part of the body portion together with the outer peripheral sheet portions 2a and 2b, That is, the outer peripheral surface portion of the bottom portion is formed.

  Further, when the rising portions 8a and 8a having a triangular shape are raised, the vertical seal 5 and the both folding portion seals 6 and 6 are arranged in a trifurcated manner on the peripheral surface portion of the body portion.

  In this state, when the contents are accommodated in the packaging bag 1 and a load acts on the bottom surface portion, the load is a joint portion between the vertical seal 5 and the folding portion seals 6 and 6 via the triangular rising portions 8a and 8a. The stress acts in the direction in which each seal is peeled off at the joint portion.

  At this time, since the reinforcing seal 12 is formed, the area of the fused portion of the joint portion is increased as compared with the case of only the vertical seal 5 and the folded-in portion seals 6 and 6, thereby the vertical reinforcing seal portion 13 and both The folding reinforcing seal portions 14 and 14 can counter the stress acting in the direction in which the vertical seal 5 and the folding portion seals 6 and 6 are peeled off, and the vertical seal 5 and the folding portion seals 6 and 6 are prevented from being peeled off and sealed. The state can be maintained.

  The shape of the reinforcing seal 12 is not limited to the shape as described above, and a vertical reinforcing seal portion formed by fusing the opposing surface portions of both outer peripheral sheet portions facing each other inside the vertical seal, and a folding portion. What is necessary is just to consist of the outer periphery sheet | seat part which mutually opposes inside a seal | sticker, and the folding reinforcement | strengthening seal | sticker part formed by fuse | melting between the opposing surface parts of a folding sheet part, and it was formed ranging over the vertical seal | sticker and the fold-in part seal | sticker.

  Further, in the above-described embodiment, the example in which the end portions of the pair of outer peripheral sheet portions 2a and 2b and the folded sheet portion 4 are integrated with the bottom seals 7 and 7 is described, but a single synthetic resin film is folded, The folded sheet portion 4 may be folded between the pair of outer peripheral sheet portions 2a and 2b facing each other by folding the folded end portion in a folded state.

  Further, the sealed structural chuck provided in the opening is not limited to the structure of the above-described embodiment, and may be formed of other structures.

  Furthermore, in the above-described embodiment, the example in which the folding sheet portion 4 is provided only at one end of the bag base 8 has been described. However, the folding sheet portions 4 are provided at both ends of the bag base to form a rectangular parallelepiped shape when used. A structure may be used as a liquid container or the like.

  In addition, the use of the packaging bag according to the present invention is not limited to the prevention of deterioration due to moisture during the transportation of precision parts as described above, but can be used in a variety of cases such as transporting fresh food products and other cases in which a fluid is enclosed inside. Can be adapted over time.

DESCRIPTION OF SYMBOLS 1 Packaging bag 2a, 2b Peripheral sheet | seat part 3 Folding 4 Folding sheet | seat part 5 Longitudinal seal 6 Folding part seal | sticker 7 Bottom seal 8 Bag base | substrate 9 Difficult-bonding layer 10 Intermediate | middle layer 11 Fusing layer 12 Reinforcement seal 13 Vertical reinforcement sealing part 14 Folding Reinforced seal part 20 Sealing structure type chuck 21 Base part 22 Female sealing body 23 Male sealing body 24 Female hook claw parts 25, 26 Female hook protrusion 27 Male hook protrusion 28, 29 Male hook protrusion 30 Sealing protrusion Article

Claims (7)

A pair of outer peripheral sheet portions arranged in an overlapping manner, and a folded sheet portion that is folded between the two outer peripheral sheet portions in a state of being folded through a crease, between the opposite side edge portions of the two outer peripheral sheet portions And a pair of fold-in part seals formed by fusing between the side edge portions of the outer peripheral sheet part and the fold-in sheet part that are continuous with the vertical seal. In a packaging bag having a bag base,
A longitudinal reinforcing seal portion formed by fusing the opposing surface portions of the two outer peripheral sheet portions facing each other inside the vertical seal, and an outer peripheral sheet portion facing each other inside the folding portion seal and an opposing surface portion of the folding sheet portion. A packaging bag characterized in that a reinforced seal composed of a fold-in reinforced seal portion formed by fusing the skirt is formed across the vertical seal and the fold-in portion seal.   The packaging bag according to claim 1, wherein the reinforcing seal is formed based on stress analysis by a finite element method.   The reinforcing seal is formed in a shape in which an edge of the vertical reinforcing seal portion is inclined inward continuously from an inner edge of the vertical seal, and an edge of the folding reinforcing seal portion is continuous from an inner edge of the folding seal. The packaging bag according to claim 1, wherein the packaging bag is formed in an inwardly inclined shape.   The folding sheet portion includes a fusion layer made of a fusible material disposed on a side facing the outer peripheral sheet portion, and a hardly fusible layer made of a non-fusible material disposed on a side to be overlapped with each other. The packaging bag according to claim 1, 2 or 3 having a multilayer structure comprising:   The packaging bag according to claim 1, wherein the bag base is formed in a shape in which both side portions of a portion where the outer peripheral sheet portion and the folded sheet portion overlap are cut out obliquely.   The said bag base | substrate has an opening part in the edge part on the opposite side to the folding sheet | seat part of both said outer periphery sheet | seat parts, The sealing structure type chuck | zipper was provided in the arrangement | positioning which crosses this opening part. The packaging bag described.   The sealed structural chuck includes a pair of base parts made of synthetic resin in the form of a tape fixed to each opposing surface in the opening of the bag base, and projects integrally on the surface of one of the base parts And is provided with a female sealing body composed of a pair of female hook protrusions having a hook-shaped claw part protruding inward at the tip part, and is integrally projected on the surface of the other base part, A male sealing body having a pair of male ridges having a cross-sectional ridge shape inserted between the female ridges, and having a claw portion projecting outward at the tip. A sealing protrusion that is integrally provided at an intermediate position between the female female protrusions of the base portion and is press-fitted between the male male protrusions of the other base portion; By inserting into the sealing body, the claws between the two are engaged with each other and the sealing ridge is press-fitted between the backs of the male ridges. Packaging bag according to claim 6 and comprising a as.

Images