JP2018062113A - Spout seal mold unit, spout attachment method using the same, and spout attachment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of a seal defect caused by a melted material of a spout mounting portion or a sheet material protruding. SOLUTION: This is a spout sealing die 1 used when sealing a sheet material 62 constituting a bag main body by heat-bonding to a mounting portion 31 of a spout 30, from both sides of the mounting portion 31. It has a pair of dies 11 and 12 that sandwich the side surface portion 32 of 31 and the sheet material 62 arranged on the outside of the side surface portion 32, and the dies 11 and 12 have a shape corresponding to the overhanging shape of the side surface portion 32. The sealing surfaces 10 and 20 are formed with the recesses 12 and 22, and the edge of the sealing surfaces 10 and 20 on the bag body side in the thickness direction has the sealing surfaces 10 and 20 in the concave direction of the recesses 12 and 22. The recesses 15 and 25 recessed from the position 20 are formed locally between both ends of the recesses 12 and 22 where the recesses 12 and 22 begin to be recessed and a position separated outward by a certain distance from both ends. Use a spout seal mold. [Selection diagram] Fig. 5

Description

  The present invention relates to a spout sealing mold unit, a spout mounting method and a spout mounting structure using the spout sealing mold unit, and more particularly, a melt that is generated when sealing a bag body and a spout. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spout seal mold unit that does not occur, a spout attachment method and a spout attachment structure using the spout seal mold unit.

  Conventionally, there is a packaging container in which a spout (“spout”) is sealed at the edge of the bag body. The spout which comprises the packaging container of this form is mainly comprised from the attachment part and the spout part. An attachment part is a site | part for sealing and attaching a spout to the edge of a bag main-body part. A typical example of the attachment portion is a so-called boat-like shape in which the shape when viewed in plan is a rhombus or a substantially rhombus, and the shape when viewed from the side is a rectangle. Such a spout is attached to the bag body portion by sealing the outer surface of the attachment portion and the inner surface of the bag body portion at the edge of the bag body portion.

  The packaging container in which the spout is sealed at the edge of the bag body portion has been devised in various ways when the attachment portion and the bag body portion are sealed, and the occurrence of poor sealing is suppressed.

  For example, the spout described in Patent Document 1 is configured for the purpose of preventing the accumulation of resin. This spout is composed of a spout, a fusion fixing part, and a fusion thin part. The spout is provided at one end of a spout cylinder that is formed in a cylindrical shape. The fusion fixing part is a part fixed to the bag main body part, and extends in the direction perpendicular to the axial direction of the dispensing cylinder at the other end of the dispensing cylinder. The fusion thin portion extends in the longitudinal direction of the fusion fixing portion and is configured to be continuous with the side end of the fusion fixation portion. In this spout, the upper end portion of the fusion thin wall portion is configured to be located at a portion that is spaced downward by a resin pool interval from the position at which the fusion fixing portion is fixed to the upper end of the bag body.

  Moreover, the spout described in Patent Document 2 can easily fuse the spout to the inner surface of the bag main body when the spout is attached to the bag main body, and no defective seal portion is generated. The purpose is to provide spouts. This spout has a hollow tube portion and an attachment portion for mounting on a peripheral seal portion of the bag body portion below the hollow tube portion.

  The attachment part is comprised by the main-body part, the projection part, and the thin part. The main body has a boat shape having a predetermined height with acute angles in the longitudinal direction. A plurality of protrusions are provided on the outer surface of the main body, and each protrusion protrudes outward from the outer peripheral surface of the main body and is formed along the peripheral surface. And the thin part is formed in the front-back both ends of a main-body part. The thin portion is a flat plate having a thickness of 0.3 to 1 mm, and the width is narrowed from the upper end of the attachment portion toward the lower end in the height direction of the attachment portion.

Japanese Patent Laid-Open No. 2004-210321 JP 2006-089047 A

  In the spout proposed in the above-mentioned Patent Document 1, a device is devised to prevent the accumulation of resin on the outer edge of the bag main body portion with respect to the portion where the bag main body portion and the spout are sealed. However, at the inner end edge, there is a possibility that the melt generated when sealing is protruded from the seal portion.

  Moreover, in the spout proposed by patent document 2, since the both ends of a spout are comprised as a thin part, when sealing a spout and a bag main-body part, there exists a possibility that a thin part may melt. When the thin-walled portion has melted, there is a possibility that a melt produced by melting melts out of the seal portion.

  If the melted product that melts at the time of sealing protrudes from the sealed part, not only will the appearance worsen, but when the melted product that has melted has hardened, stress will concentrate at that position. Also cause damage.

  The present invention has been made in order to solve the above-described problems, and the purpose of the present invention is to provide a spout that can suppress the occurrence of a sealing failure that is caused by the melted melt of the spout attachment and sheet material. An object of the present invention is to provide a sealing mold, a spout mounting method and a spout mounting structure using the sealing mold.

  (1) A spout seal mold according to the present invention for solving the above-mentioned problems is a spout seal mold used for sealing a sheet material constituting a bag body portion to a spout attachment portion by thermocompression bonding. Then, from both sides of the mounting portion, a pair of molds sandwiching the side surface portion of the mounting portion and the sheet material arranged outside the side surface portion, and the surfaces facing the pair of molds, A concave portion having a shape corresponding to the protruding shape of the side surface portion is formed in a part of the seal surface, and the bag main body side in the thickness direction of the mold is formed on the seal surface. On the edge of the recess, a recessed portion in which the seal surface is recessed in the direction in which the recessed portion is recessed is formed between both ends of the recessed portion where the recessed portion starts to be recessed and a position away from the both ends by a certain distance. It is characterized by.

  According to the present invention, as described above, the seal surface has a dent on the edge of the bag body in the thickness direction of the mold, and the dent is constant from both ends and both ends of the recess. Since it is formed between the position away from the outside by a distance, when the spout attachment part and the sheet material constituting the bag body part are sealed, the positions of both ends of the spout attachment part are A low-strength seal portion having a relatively low seal strength relative to the strength of the seal can be formed. The formation of the low-strength seal portion can suppress the generation of a melt that occurs when sealing, and can prevent the melt from protruding from the sealed portion.

  In the spout seal mold according to the present invention, the indented portion functions as an escape portion for allowing the melted material melted by thermocompression bonding by the die.

  According to the present invention, even when a melt is generated when sealed, the melt is prevented from protruding from the sealed position by escaping to the recess formed in the spout seal mold. Can do. As a result, it is possible to prevent the melt from being present in the vicinity of the portion sealed as a foreign object when it has hardened.

  (2) The spout attachment method according to the present invention for solving the above problems is a spout attachment method in which the sheet material constituting the bag body is sealed by thermocompression to the attachment part of the spout and the spout is attached to the bag body. A sealing step of sealing the side member of the attachment part and the sheet material disposed outside the side part with a pair of molds from both sides of the attachment part; The opposing surface of the mold functions as a seal surface, and a recess having a shape corresponding to the protruding shape of the side surface of the mounting portion is formed in a part of the seal surface, and both ends of the recess where the recess starts to be recessed Between the portion and a position away from the both ends by a certain distance, a recessed portion that is recessed in the direction in which the recessed portion is recessed is formed on the edge on the bag body portion side in the mold thickness direction. Formed and before The side surface portion of the mounting portion and the sheet material, characterized in that it is sealing the sealing surfaces except the recess portion in close contact with the sheet material.

  According to the present invention, since the above-described mold in which the hollow portion is formed is used and the sealing surface excluding the hollow portion is closely adhered to the sheet material and sealed, the sheet material constituting the spout attachment portion and the bag main body portion When the two are sealed, low-strength seal portions having relatively low seal strength with respect to the overall seal strength can be formed at the positions of both ends of the spout attachment portion. Therefore, generation | occurrence | production of the melt | dissolution generate | occur | produced when it seals can be suppressed, and it can suppress that a melt | fusion protrudes from the sealed part.

  In the spout attachment method according to the present invention, in the sealing step, the melted material that has been melted by thermocompression bonding with the mold is released to the recess.

  According to the present invention, even when a melt is generated when sealed, the melt is prevented from protruding from the sealed position by escaping to the recess formed in the spout seal mold. can do. Since the melt does not protrude from the sealed portion, it is possible to prevent foreign matters from being present in the vicinity of the sealed portion when the melt is solidified.

  (3) In the spout mounting structure according to the present invention for solving the above-mentioned problems, the spout is attached to the bag main body by thermocompression bonding of a sheet material constituting the bag main body portion to a side surface portion constituting the spout attachment portion. The spout attachment structure attached to the part, the position at the edge of the attachment part in the height direction on the bag body part side, and a position away from the both ends by a certain distance from the both ends of the attachment part A low-strength seal portion that is relatively low with respect to the seal strength for sealing the sheet materials to each other is formed.

  According to this invention, as described above, since the low strength seal portion having a relatively low seal strength is formed with respect to the overall seal strength in which the sheet materials are sealed to each other at the spout attachment portion, Generation | occurrence | production of the melt | dissolution to generate | occur | produce can be suppressed and it can suppress that a melt | dissolution protrudes from the sealed part.

  According to the present invention, it is possible not only to improve the appearance of the finished packaging container, because it is possible to suppress the occurrence of a sealing failure caused by the melted out melt of the spout attachment and sheet material. The quality of the finished packaging container can be raised to a high standard.

It is the top view which looked at the metal mold | die for spout seals concerning this invention from the side. It is the top view which looked at the metal mold | die for spout seals concerning this invention from the direction of II of FIG. It is the top view seen from the direction where the side part of the attaching part which constitutes a spout is located in the front. It is the top view which looked at the spout from which the cover part was removed from the tip side of the extraction part. It is explanatory drawing which shows the process of sealing the sheet | seat material which comprises a spout and a bag main-body part with the metal mold | die for spout seals. It is explanatory drawing which showed the process which is paying attention to a hollow part and has sealed the attachment part and sheet | seat material of a spout like a still image. It is a top view of the packaging container to which the spout attachment structure of this embodiment was applied. It is explanatory drawing which showed the spout attachment structure of this embodiment compared with the conventional spout attachment structure. It is the photograph which image | photographed the result of the red check test of an Example. It is the photograph which image | photographed the result of the red check test of a comparative example. It is a graph which shows the result of a dynamic pressure resistance test. It is a graph which shows the result of a drop test.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the spout seal mold 1 according to the present invention, a spout attachment method using the spout seal mold 1 and an example of one form of the spout attachment structure will be described. The technical scope of the present invention is not limited to the contents of the following description and the forms shown in the drawings, but includes forms similar to the technical ideas shown in the embodiments.

[Basic configuration]
(Spout seal mold)
The spout seal mold 1 according to the present invention is a mold used for sealing by attaching a sheet 62 material constituting the bag body 61 to the attachment portion 31 of the spout 30 by thermocompression bonding. The spout seal mold 1 includes a pair of molds 11 and 21 for sandwiching a side surface portion 32 of the mounting portion 31 and a sheet material 62 disposed outside the side surface portion 32 from both sides of the mounting portion 31. doing. The molds 11 and 21 have seal surfaces 10 and 20 in which concave portions 12 and 22 having a shape corresponding to the protruding shape of the side surface portion 32 of the attachment portion 31 constituting the spout 30 are formed.

  And in the sealing surfaces 10 and 20, the recessed part 15 which dented the sealing surfaces 10 and 20 to the edge of the bag main-body part 61 side in the thickness direction of the metal mold | die 11 and 21 in the recessed direction of the recessed parts 12 and 22; 25 is formed at a position where the concave portions 12 and 22 start to be recessed and overlapped with each other at a certain distance from both ends of the concave portions 12 and 22.

(Spout mounting method)
The spout attachment method according to the present invention is an attachment method in which the spout 30 is attached to the bag main body 61 by thermocompression bonding the sheet material 62 constituting the bag main body 61 to the attachment portion 31 of the spout 30. In this spout attachment method, a seal that sandwiches and seals the side surface portion 32 of the attachment portion 31 and the sheet material 62 arranged outside the side surface portion 32 with a pair of molds 11 and 21 from both sides of the attachment portion 31. It has a process. The molds 11 and 21 have concave portions 12 and 22 on the seal surfaces 10 and 20 having a shape corresponding to the protruding shape of the side surface portion 32 of the attachment portion 31. The recesses 12 and 22 start to be recessed, and the recesses 15 and 25 that are recessed in the direction in which the recesses 12 and 22 are recessed are located at both ends of the recesses 12 and 22 and the positions overlapping the inside by a certain distance from both ends. It is formed at the edge on the bag body 61 side in the thickness direction of the molds 11 and 21.

  The side surface portion 32 of the attachment portion 31 and the sheet material 62 are sealed by bringing the sealing surfaces 10 and 20 excluding the recessed portions 15 and 25 into close contact with the sheet material 62.

(Spout mounting structure)
The spout attachment structure according to the present invention is an attachment in which the spout 30 is attached to the bag main body portion 61 by thermally pressing the sheet material 62 constituting the bag main body portion 61 to the side surface portion 32 constituting the attachment portion 31 of the spout 30. Structure. In this spout attachment structure, the edge of the attachment portion 31 on the bag body portion 61 side in the height direction is locally located between both ends of the attachment portion 31 and a position away from the both ends by a certain distance. A low-strength seal portion 70 having a relatively low seal strength for sealing the sheet materials 62 to each other is formed.

  Hereinafter, a spout seal mold 1, a spout attachment method using the spout seal mold 1, and a spout attachment structure will be specifically described.

[Spout]
First, with reference to FIG.3 and FIG.4, the outline | summary of the spout 30 to which this invention is applied is demonstrated. The spout 30 shown in FIGS. 3 and 4 shows an example of a spout to which the present invention is applied. The spout to which the present invention is applied is the spout 30 in the form shown in FIGS. 3 and 4. Is not limited.

  The spout 30 includes an attachment part 31, an extraction part 40 and a lid part 50. 3 is a plan view of the form of the spout 30 with the lid 50 placed on the extraction portion 40, as viewed from the direction in which the side surface 32 is located on the front, and FIG. 4 shows the lid 50 removed. It is the top view which looked at the form of the spout 30 which looked at from the front end side of the extraction part 40.

  The attachment portion 31 has a so-called boat shape. The boat shape means that the side surface portions 32 on both sides in the lateral direction of the attachment portion 31 (the direction indicated by the symbol Y in FIG. 4) project outward and the vertical direction (the direction indicated by the symbol X in FIGS. 3 and 4). ) On both sides, the side portions 32 form a sharp angle and form a sharp shape. The dimension of the side surface part 32 in the height direction (the direction indicated by the symbol Z in FIG. 3) is formed to be constant.

  Each side surface portion 32 has an inclined surface portion 33 that inclines outward from the center in the Y direction as it goes from both ends in the X direction, and a curved portion that protrudes outward in the Y direction at the center portion in the X direction. 34. As shown in FIG. 4, the curved portion 34 has an arc shape when the spout 30 is viewed from the distal end side of the extraction portion 40. Each side surface 32 is formed with a plurality of protrusions 35 extending in the vertical direction.

  Although not shown in FIG. 3, a hole is formed in the center of the attachment portion 31 so as to penetrate the height direction of the side surface portion 32 (the direction indicated by reference sign Z in FIG. 3). This hole is communicated with a pouring path 41 formed inside a pouring portion 40 described later. In addition, the height direction (Z direction) of the attachment part 31 corresponds with the thickness direction of a pair of metal mold | dies 11 and 21 which comprise the metal mold | die 1 for the spout seal mentioned later.

  The extraction part 40 protrudes from one surface of the attachment part 31 in the height direction. The extraction part 40 is formed in a cylindrical shape whose tip side is tapered. Inside the extraction portion 40, an extraction path 41 communicated with a hole formed in the central portion of the attachment portion 31 extends in the axial direction of the extraction portion 40 (direction indicated by reference sign Z in FIG. 3). Yes. A plurality of stoppers 42 extending in the circumferential direction are formed on the outer surface of the extraction portion 40. As for the stopper 42, the front end side is extended toward the attachment part 31 side. Therefore, the stopper 42 functions as a return, and suppresses that the tube etc. which covered the outer side of the extraction | pouring part 40 remove | deviate from the extraction | pouring part 40 easily.

  The lid part 50 includes a cylindrical main body part 51 and an opening assisting part 52 provided on the upper part of the main body part 51. The main body 51 is formed such that the diameter gradually decreases from the lower part toward the upper part. The opening assistance part 52 is comprised by a pair of plate-shaped member. Each plate-like member constituting the opening assisting member 52 projects outward from the outer surface of the main body 51 at the upper part of the main body 51.

  As described above, the spout 30 shown in FIGS. 3 and 4 shows one example of the spout 30 to which the present invention is applied. The spout 30 to which the present invention is applied is not limited to the form shown in FIGS. 3 and 4 as long as the attachment portion 31 has a boat shape.

[Spout seal mold]
As shown in FIGS. 1 and 2, the spout seal mold 1 includes a pair of molds 11 and 21. The spout seal mold 1 seals the spout 30 and the sheet material 62 by sandwiching the spout 30 and the sheet material 62 constituting the bag main body 61 between the pair of molds 11 and 21. The opposing surfaces of the molds 11 and 21 are configured as seal surfaces 10 and 20. And the recessed parts 12 and 22 are formed in each seal surface 10 and 20, respectively.

  The shape of the recesses of the recesses 12 and 22 corresponds to the shape in which the attachment portion 31 constituting the spout 30 projects. In the spout seal mold 1 of the example shown in FIGS. 1 and 2, the shape of the recesses 12 and 22 is separated from the end E of each mold by a certain distance L1 toward the center as shown in FIG. In the regions 16 and 26 up to the position P1, the sealing surfaces 10 and 20 are formed flat. And it has begun to dent from position P1, respectively. Inclined regions 13 and 23 are formed between the position P1 and the position P2 that is separated from the P1 by a distance L2 toward the center. Curved regions 14 and 24 are formed between the positions P2, respectively. The curved regions 14 and 24 are formed by curved surfaces in which the cross-sectional shape draws an arc.

  In addition, depressions 15 and 25 are formed in the sealing surfaces 10 and 20 of the molds 11 and 21, respectively. The recesses 15 and 25 are formed at both ends of the recesses 12 and 22 and at the edge on the bag main body 61 side in the thickness direction of the molds 11 and 21. Specifically, the depressions 15 and 25 are respectively formed in the local areas where both ends of the recesses 12 and 22 overlap with each other by a certain distance inside the both ends. As shown in FIG. 1, the recessed portions 15 and 25 are formed by being recessed from the surface of the seal surfaces 10 and 20 by a minute depth in the direction in which the recessed portions 12 and 22 are recessed. The depths of the recesses 15 and 25 are formed to be 20% or more and 30% or less of the depth of the recesses 12 and 22.

  Moreover, as shown in FIG. 2, each hollow part 15 is suddenly directed toward the inner side in the thickness direction from the edge in the thickness direction (Z direction) of the molds 11 and 21 toward the outer side from both ends. The first slope 15a that rises, and the second slope 15b that gently slopes toward the edge in the thickness direction from the highest portion of the first slope 15a outside the first slope 15a. ing. Although not shown in FIG. 2, the hollow portion 25 of the mold 21 similarly has a first slope that suddenly rises from the edge in the thickness direction toward the inside in the thickness direction, and the first slope It is comprised by the 2nd slope which inclines moderately toward the edge of a thickness direction from the highest site | part of a 1st slope outside the slope. That is, when the depressions 15 and 25 are viewed from the front surface of the seat surface, the depressions 15 and 25 have a triangular shape or a shape close to a triangle, the inclination angle of the hypotenuse near the center side is large, and the depression 12 , 22 are formed so that the inclination angle of the hypotenuse away from both sides is small. In addition, the function and effect | action of the hollow parts 15 and 25 are demonstrated by the spout attachment method mentioned later.

[How to install spout]
The spout 30 is attached by being sealed to the bag body 61 by the spout seal mold 1 described above. As shown in FIG. 5, the sealing step that constitutes the spout attachment method includes, from both sides of the attachment part 31 of the spout 30, the side part 32 of the attachment part 31 and the sheet material 62 disposed outside the surface part. A pair of molds 11 and 21 are sandwiched and sealed.

  The molds 11 and 21 have concave portions 12 and 22 on the seal surfaces 10 and 20 having a shape corresponding to the protruding shape of the side surface portion 32 of the attachment portion 31 constituting the spout 30. The seal surfaces 10 and 20 provided with the recesses 12 and 22 are arranged to face each other. In these molds 11, 21, recesses 15, 25 are formed at both ends of the recesses 12, 22 where the recesses 12, 22 begin to be recessed, and at local portions where they overlap each other at a fixed distance from both ends. The dents 15 and 25 are formed in the edge on the bag body 61 side in the thickness direction of the molds 11 and 21 by being recessed in the direction in which the recesses 12 and 22 are recessed.

  In the sealing step, the pair of molds 11 and 21 approach each other, and the attachment part 31 of the spout 30 and the sheet material 62 of the bag main body part 61 are sealed by being sandwiched between the molds 11 and 21. At that time, the attachment portion 31 and the sheet material 62 are sandwiched between the concave portions 12 and 22 formed in the seal surfaces 10 and 20 of the thermocompression bonding portion. When the attachment portion 31 and the sheet material 62 are sandwiched at the positions of the recesses 12 and 22 of the thermocompression bonding portion, the attachment surface 31 and the sheet material 62 have the sealing surfaces 10 and 20 except for the recess portions 15 and 25 as the sheet. It is in close contact with the material 62. On the other hand, a minute gap is formed between the sheet material 62 and the seal surfaces 10 and 20 at the positions of the recesses 15 and 25. That is, it is not crimped.

  FIG. 6 shows the recessed portions 15 and 25 when the mounting portions 31 and the sheet material 62 are sandwiched and sealed with the molds 11 and 21. FIG. 6 is an explanatory diagram showing, in a still image manner, a process of enlarging the depressions 15 and 25 and sealing the attachment part 31 of the spout 30 and the sheet material 62.

  When the attachment portion 31 of the spout 30 and the sheet material 62 are sandwiched and sealed by the pair of molds 11 and 21, the recess portions 15 and 25 are arranged in the longitudinal direction from the end portion of the attachment portion 31 and the end portion ( It is located in a portion that overlaps a certain distance in the (X direction). Therefore, in the region corresponding to the depressions 15 and 25, the sheet materials 62 are not pressed against each other by the molds 11 and 21 or are sealed with a low strength, so that the sealing strength is lower than the other regions. In the sheet material 62, when the area | region corresponding to the hollow parts 15 and 25 is not crimped | bonded by the metal mold | die 11 and 21, the amount which the sheet material 62 melts is small. As a result, the melted sheet material 62 does not protrude from the seal portion.

  Further, when the amount of the melt melted at the end portion of the attachment portion 31 and a position away from the end portion by a certain distance is unnecessarily large, the melt material is accommodated in the recess portions 15 and 25. That is, the depressions 15 and 25 function as escape parts for allowing the melt to escape inside the depressions 15 and 25. As a result of the molten material escaping inside the recessed portions 15 and 25, the recessed portions 15 and 25 prevent the molten material from protruding outside the seal portion. “Melting” and “melting” mean that the solid itself becomes a liquid or fluid, and “melt” means that the solid itself becomes a liquid or fluid.

[Spout mounting structure]
An attachment structure between the attachment part 31 of the spout 30 and the bag body part 61 will be described with reference to FIGS. 7 and 8. FIG. 7 shows one example of a packaging container 60 to which the spout mounting structure of the present invention is applied.

  In the packaging container 60 shown in FIG. 7, the bag body 61 is formed by sealing the peripheral edges of a pair of sheet materials 62. An oblique seal portion 63 is provided on the upper side of the bag main body portion 61 on one side of the center in the thickness direction. The oblique seal portion 63 is formed to extend obliquely downward from the center or substantially center of the upper edge of the bag body portion 61 toward one side in the thickness direction. In other words, the diagonal seal portion 63 is formed so as to obliquely cross the center or substantially central position of the upper edge of the bag body portion 61 and the side edge on one side. The spout 30 is attached to the bag main body 61 at the position of the oblique seal portion 63.

  In the spout attachment structure of the present embodiment, as shown in FIG. 7, a low-strength seal portion 70 having a relatively low seal strength between the sheet materials 62 is formed. The low-strength seal portion 70 is formed at a local portion between both ends of the attachment portion 31 and a position away from the both ends by a certain distance on the edge of the attachment portion 31 on the bag body portion 61 side in the height direction. ing. The “bag body portion 61 side” specifically refers to the positions of both ends of the attachment portion 31 of the oblique seal portion, and the inner edge 63a and the outer end of the bag body portion 61 in the oblique seal portion 63. It means the inner edge 63a among the edges 63b. By providing the spout mounting structure with the low-strength seal portion 70, as described with reference to FIG. 8, it is possible to prevent the melt from protruding from the seal portion.

  In the spout mounting structure provided with the low-strength seal portion 70, as shown in FIG. 8A, in the oblique seal portion 63, the melted material is transferred from the oblique seal portion 63 to the bag body portion 61 at the position of the low-strength seal portion 70. It does not stick out inside. On the other hand, in the conventional spout attachment structure that does not have the low-strength seal portion 70, as shown in FIG. 8B, the melted material melted at the both ends of the attachment portion 31 is sealed inside the bag body portion 61. It sticks out. In FIG. 8B, the reference numeral 100 indicates the protrusion of the melt.

  In the conventional spout mounting structure shown in FIG. 8 (B), after the protruding melt has hardened, stress concentrates on the protruding portion 100, causing damage to the bag body 61. Further, the protruding portion 100 is formed as a protruding foreign object. If the sheet material 62 is rubbed outside at the position of the foreign material formed by the protrusion 100 and an external force is applied, the bag main body portion 61 may be damaged at the position of the foreign material. On the other hand, in the packaging container 60 of the present embodiment shown in FIG. 8 (A), since the protrusion does not occur, the occurrence of problems that have occurred in the conventional spout mounting structure is suppressed.

  Hereinafter, the present invention will be described in more detail based on examples.

  Example 1 to Example 4 were manufactured by the spout attachment method using the spout seal mold 1 of the spout 30 and the bag body 61 according to the present invention. Table 1 summarizes the form of the spout seal mold 1 used for manufacturing each example. The first mold to the fourth mold described in Table 1 mean the spout seal mold 1 according to the present invention having different forms.

  As shown in Table 1, all of the sealing devices in which the first to fourth molds are used are semi-automatic machines. Further, the item name “depth” described in Table 1 is the dimension d in the depth direction of the recesses 15 and 25 shown in FIG. 1, and the item name “width” is the spout seal shown in FIG. This is a dimension h in the thickness direction of the metal mold 1.

  The first mold has a configuration in which the depression 15 is formed only in the upper mold 11 and the depression 25 is not formed in the lower mold 21. In the first mold, the dimension in the depth direction of the recess 15 formed in the upper mold 11 is 2 mm, and the dimension in the thickness direction is 2 mm.

  The second mold to the fourth mold have a form in which depressions are formed in both the upper mold 11 and the lower mold 21. In the second mold, the dimension in the depth direction of each of the depressions 15 and 25 formed in the upper mold 11 and the lower mold 21 is 2 mm, and the dimension in the thickness direction is 2 mm. In the third mold, the dimension in the depth direction of each of the depressions 15 and 25 formed in the upper mold 11 and the lower mold 21 is 4 mm, and the dimension in the thickness direction is 2 mm. In the fourth mold, the dimension in the depth direction of each of the depressions 15 and 25 formed in the upper mold 11 and the lower mold 21 is 2 mm, and the dimension in the thickness direction is 4 mm.

[Example 1]
Example 1 was manufactured by using the first mold and sealing the bag body 61 to the attachment part 31 of the spout 30. As shown in FIG. 5, the spout 30 and the bag body 61 are arranged such that the sheet material 62 constituting the bag body 61 is arranged outside the attachment portion 31 of the spout 30, and the upper mold 11 and the lower mold 11 are arranged from both sides. Sealing was performed by sandwiching with the side mold 21.

[Example 2]
Example 2 was manufactured by using the second mold described above and sealing the bag body 61 to the attachment part 31 of the spout 30. Sealing between the spout 30 and the bag body 61 was performed in the same manner as in Example 1.

[Example 3]
In Example 3, the bag body 61 was sealed to the attachment part 31 of the spout 30 using the third mold described above. Sealing between the spout 30 and the bag body 61 was performed in the same manner as in Example 1.

[Example 4]
Example 4 was manufactured by using the above-described fourth mold and sealing the bag body 61 to the attachment part 31 of the spout 30. Sealing between the spout 30 and the bag body 61 was performed in the same manner as in Example 1.

  In order to confirm the effect of the spout mounting structure manufactured by the spout mounting method using the spout seal mold 1 according to the present invention, a red check test, a dynamic pressure test, a drop test, and an impact resistance test were performed. In addition, in order to perform a comparative study, compared to Comparative Example 1 manufactured by sealing the spout 30 and the bag main body 61 using a spout seal mold that has been conventionally used and has no depression. However, a similar test was conducted.

[Comparative Example 1]
In Comparative Example 1, the spout 30 and the bag main body 61 are sealed by using a spout seal mold in which the depressions are not formed on the seal surfaces 10 and 20 of the upper mold 11 and the lower mold 21. And made it. The spout 30 and the bag body 61 were sealed in the same manner as in Example 1.

<Red Check Test>
In order to confirm the state of the seal between the attachment portion 31 of the spout 30 and the bag body portion 61, a red check test was performed. The red check test is a test for confirming whether or not a minute gap is formed in the confirmation target part by infiltrating the red test liquid (hereinafter simply referred to as “test liquid”) into the confirmation target part. It is. Specifically, the red check test is performed as follows.

  First, a test solution is injected from the spout 30 into the packaging container 60 manufactured as a test sample. When the inside of the bag body 61 is filled with the test solution, the inside of the bag body 61 is raised to a certain internal pressure by the test solution. When a seal failure exists at a position where the spout 30 and the bag body 61 are sealed, the test liquid filled in the bag body 61 penetrates into the portion with the seal failure. The red check test is a test for determining whether or not there is a seal failure in the seal portion by observing whether or not the test solution has permeated.

  In a red check test of the seal portion between the attachment portion 31 of the spout 30 and the bag body portion 61, there is a seal failure in the seal portion, and a gap is formed between the sealed attachment portion 31 and the bag body portion 61. The test liquid penetrates into the gap. By confirming whether or not the test solution has permeated, it is possible to confirm in which position of the portion where the attachment portion 31 and the bag body portion 61 are sealed is formed.

<Results of red check test>
As a result of the red check test, in Example 1 to Example 4, the test solution did not penetrate into the seal part between the attachment part 31 and the bag body part 61. That is, it was confirmed that there is no sealing failure in the seal portion between the attachment portion 31 and the bag body portion 61.

  FIG. 9 is a photograph of the test results for Example 2. As shown in FIG. 9, in Example 2, it was observed that the test solution penetrated only into the low-strength seal portion 70. Specifically, the test solution permeates only on both ends in the longitudinal direction (X direction) of the attachment portion 31 of the spout 30 and inside the bag main body portion 61. In addition, in the photograph shown in FIG. 9, it seems that the test solution exists in the center of the spout 30. However, the test liquid present in this portion is attached to the inner wall of the spout portion 40 of the spout 30 when the test liquid is injected into the bag body 61 of the packaging container 60. There is no seal failure in this part.

  On the other hand, in Comparative Example 1, it was observed that the test solution permeated from both end portions of the attachment portion 31. FIG. 10 is a photograph of the test results for Comparative Example 1. As shown in FIG. 10, it can be confirmed that the test solution has permeated from both end portions of the attachment portion 31 to the edge of the seal portion between the attachment portion 31 and the bag body portion 61 on the bag body portion 61 side. That is, in the seal portion, the test solution penetrates from the end portion of the attachment portion 31 into a certain region on the bag body portion 61 side (the lower side in FIG. 10).

  Considering the results of the red check test, the following can be considered. In the first to fourth embodiments, the low-strength seal portion 70 is provided in the spout attachment structure, so that the melted material melted by the seal does not protrude from the seal portion. When there is no protrusion, the seal part between the attachment part 31 of the spout 30 and the bag main body part 61 and the seal part between the sheet materials 62 constituting the bag main body part 61 are sealed in a form that is closely adhered to each other. . Therefore, no gap is formed in the seal portion between the attachment portion 31 of the spout 30 and the bag main body portion 61 and the seal portion between the sheet materials 62 constituting the bag main body portion 61, and the test solution is not in the seal portion. It did not penetrate.

  On the other hand, in Comparative Example 1, the melt melted out by the seal protrudes from the seal portion. When the melt protrudes, the melt that has protruded inhibits the attachment portion 31 of the spout 30 and the bag body portion 61 and the sheet material 62 from being sealed in close contact with each other, forming a gap. End up. As a result, the test solution penetrated into the seal portion.

<Dynamic pressure resistance test>
In the dynamic pressure resistance test, a pouch filled with 400 mL of tap water is placed flat, pressed from above with a disk with a diameter of 20 mm at a speed of 12.5 mm / min, and the strength when the pouch breaks is read. went. In this dynamic pressure resistance test, five pieces of each of Example 1 to Example 4 and Comparative Example 1 were performed.

  The test results are shown in the graph of FIG. The horizontal axis in FIG. 11 represents Examples 1 to 4 and Comparative Example 1 as test samples, and the vertical axis represents dynamic pressure resistance. The unit of the dynamic pressure resistance shown in FIG. 11 is kgf. Further, the values plotted in FIG. 11 are average values of the results of measurement for each test sample.

  As shown in FIG. 11, the dynamic pressure resistances of Examples 1 to 4 were about 765 kgf, 880 kgf, 860 kgf, and 700 kgf, respectively. On the other hand, the dynamic pressure resistance of Comparative Example 1 was about 595 kgf. As is clear from the results of the dynamic pressure resistance test, it can be seen that the dynamic pressure resistance of Examples 1 to 4 is higher than that of Comparative Example 1.

<Drop test>
The drop test was performed by filling 400 mL of tap water into the interiors of Examples 1 to 4 and Comparative Example 1, and dropping them from a height of 1200 mm. Ten tests were performed for each of Examples 1 to 4 and Comparative Example 1.

  The test results for Examples 1 to 4 and Comparative Example 1 indicate the number of test samples in which damage occurred with respect to the total number of test samples. FIG. 12 is a graph showing the result of the drop test. The horizontal axis in FIG. 12 represents Examples 1 to 4 and Comparative Example 1 as test samples, and the vertical axis represents the percentage of the number of breakage as a percentage.

  As shown in FIG. 12, the breakage rates of Examples 1 to 4 were 10%, 5%, 0%, and 0%, respectively. On the other hand, the breakage rate of Comparative Example 1 was 60%. As is clear from the results of the drop test, the breakage rate of the packaging container 60 related to the test samples of Examples 1 to 4 is greatly reduced compared to the breakage rate of the packaging container 60 related to the test sample of Comparative Example 1. Yes.

  Considering the results of the above dynamic pressure resistance test and drop test, the following can be considered. When the low-strength seal portion 70 is formed in the seal portion as in the first to fourth embodiments, the melt does not protrude. When the protrusion does not occur, the attachment part 31 of the spout 30, the bag main body part 61, and the sheet material 62 constituting the bag main body part 61 are sealed in a close contact form. Therefore, the surface pressure of the attachment portion 31 of the spout 30 and the seal portion of the bag main body portion 61 and the seal portion of the sheet materials 62 constituting the bag main body portion 61 are evenly distributed, and a portion having a high surface pressure is formed. That is blocked. As a result, it was possible to prevent a large load from being applied only to a part and obtain a good result.

  On the other hand, when the melt overflows as in Comparative Example 1, the surface pressure of the seal increases around the melt. Therefore, when an external force is applied, the surroundings of the melt are likely to be damaged as compared with other regions. As a result, in the dynamic pressure resistance test, the dynamic pressure resistance value of Comparative Example 1 was lower than the dynamic pressure resistance values of Example 1 to Example 4. In the drop test, the test sample of Comparative Example 1 was damaged in more test samples than the test samples of Example 1 to Example 4.

<Impact resistance test>
The impact resistance test is performed by filling 400 mL of water into the bag body 61 constituting the first to fourth embodiments and the first comparative example, dropping a weight of a predetermined weight from a predetermined height, This is a test for investigating whether or not breakage occurs at 31 edge positions. The test was performed by dropping the weight 10 times. However, if an abnormality occurred before dropping 10 times, the test was terminated at that time. The test was conducted under two different conditions: a case where a 1.7 kg weight was dropped from a position of 20 cm and a case where a 2.6 kg weight was dropped from a position of 10 cm. Went about. The test was carried out for each of the conditions of Example 1 to Example 4 and Comparative Example 1 by five.

  The test result was expressed by how many test samples were damaged at the edge position of the attachment portion 31. The test results are shown in Table 2.

  When a weight having a weight of 1.7 kg is dropped from a height of 20 cm toward the test sample, abnormalities such as breakage of the seal portion are shown in Table 2, as shown in Table 2. It did not occur for the test sample. On the other hand, in the test sample of Comparative Example 1, an abnormality occurred in the seal portion between the spout 30 and the bag main body portion 61 for two test samples, that is, 40% of the test samples.

  On the other hand, when a weight of 2.6 kg is dropped from a height of 10 cm toward the test sample, abnormalities such as breakage of the seal portion occur in all the test samples of Examples 1 to 4. There wasn't. On the other hand, in the test sample of Comparative Example 1, an abnormality occurred in the seal portion between the spout 30 and the bag main body portion 61 for one test sample.

  As is clear from the results of the impact resistance test, the test samples of Example 1 to Example 4 were able to obtain better results than Comparative Example 1. In particular, no abnormalities were observed in the examples, and extremely good results were obtained.

  The spout seal mold 1 according to the present invention, the spout attachment method using the spout seal mold 1, and the spout attachment method using the spout seal mold 1 have been described above. In the sealed spout attachment structure, it is possible to suppress the occurrence of a sealing failure caused by the melted melt of the attachment portion 31 and the sheet material 62 of the spout 30, so that the appearance of the completed packaging container 60 is improved. be able to. In addition, by suppressing the protrusion of the melt, when an external force is applied to the packaging container 60, it is possible to suppress the occurrence of an abnormality in the seal portion between the spout 30 and the bag main body portion 61, which is completed. The quality of the packaging container 60 can be made high.

DESCRIPTION OF SYMBOLS 1 Spout seal metal mold 10,20 Seal surface 11,21 Mold 12,22 Recessed part 13,23 Inclined area 14,24 Curved area 15,25 Indented part 15a First slope 15b Second slope 16,26 Flat area 30 Spout 31 Attachment portion 32 Side surface portion 33 Inclined surface 34 Curved portion 35 Protrusion portion 40 Extraction portion 41 Extraction path 42 Stopper 50 Lid portion 51 Main body portion 52 Opening assisting portion 60 Packaging container 61 Bag main body portion 62 Sheet material 63 Diagonal seal 70 Low strength seal

Claims (5)

A spout seal mold used when sealing the sheet material constituting the bag main body part to the attachment part of the spout by thermocompression bonding,
From both sides of the mounting portion, a pair of molds sandwiching the side surface portion of the mounting portion and the sheet material disposed outside the side surface portion,
The surfaces facing the pair of molds are configured as seal surfaces,
A recess having a shape corresponding to the protruding shape of the side surface portion is formed on a part of the seal surface,
On the sealing surface, a recessed portion in which the sealing surface is recessed in a direction in which the recessed portion is recessed is formed at an end edge on the bag main body side in the thickness direction of the mold, and both end portions of the recessed portion in which the recessed portion starts to be recessed. A spout seal mold, wherein the mold is formed between the both ends and a position spaced outward by a certain distance.   The spout seal mold according to claim 1, wherein the hollow portion functions as an escape portion for releasing a melt melted by thermocompression bonding by the mold. A spout attachment method for attaching a spout to a bag body by sealing the sheet material constituting the bag body to the attachment part of the spout by thermocompression bonding,
From both sides of the mounting part, the sealing part includes a sealing step for sandwiching and sealing the side part of the mounting part and the sheet material disposed outside the side part with a pair of molds,
The opposing surfaces of the pair of molds function as a sealing surface,
A concave portion having a shape corresponding to the protruding shape of the side surface portion of the attachment portion is formed on a part of the seal surface,
Between the both ends of the recess where the recess starts to be recessed and a position away from the both ends by a certain distance, a recess that is recessed in the direction in which the recess is recessed is the thickness direction of the mold. It is formed on the edge of the bag body side,
The spout attachment method, wherein the side surface portion of the attachment portion and the sheet material are sealed with the sealing surface excluding the recessed portion being in close contact with the sheet material.   The spout attachment method according to claim 3, wherein in the sealing step, a melted product that has been melted by thermocompression bonding by the mold is released to the recess. A spout attachment structure in which the spout is attached to the bag main body by thermocompression bonding of a sheet material constituting the bag main body to a side surface constituting the attachment of the spout,
The sheet material is sealed between the both end portions of the attachment portion at the edge of the attachment portion in the height direction of the attachment portion and a position away from the both ends by a certain distance. A spout mounting structure characterized in that a low-strength seal portion that is relatively low with respect to the seal strength to be formed is formed.