JP2016052798A - Manufacturing method of gazette bag with mouth member and manufacturing method of gazette bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a gazette bag and the gazette bag with a mouth member, which have excellent self-standing property and prevent a hand from feeling pain when squeezing the bag with the hand.SOLUTION: A gazette bag and the gazette bag with a mouth member have a gazette bag comprising a pair of opposing flat face parts 11 and a pair of opposing side face parts 12 folded to an inner side. A manufacturing method of the gazette bag and the gazette bag with the mouth member includes a step of folding entire side edge seal parts 13 back to the sides of the flat face parts 11 or the sides of the side face parts 12, and bonding and fixing the entire side edge seal parts in a state of inserting a square columnar mandrel 40 into a cylindrical film material having the side edge seal parts 13 in which side edge parts of the flat face parts 11 and side edge parts of the side face parts 12 are heat-sealed.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a method for manufacturing a gusset bag with a mouth member and a method for manufacturing a gusset bag.

  As packaging bags for liquid or semi-liquid contents such as jelly beverages, standing pouches and flat bottom type gusset bags are used. These packaging bags are devised to ensure independence. In particular, in the case of packaging bags for jelly beverages and the like, gusset bags that can easily stand by the weight of the contents and can be easily pushed out by squeezing with hands are widely used.

  As a specific example of such a gusset bag, for example, a laminated film in which a heat-sealable film is bonded on one side is formed into a cylindrical shape, and the edges of the film are heat-sealed. Alternatively, a gusset bag with a mouth member is known in which a gusset is folded so as to come to the side surface, and the upper edge portion and the lower edge portion are heat-sealed while the mouth member is liquid-tightly attached to the upper edge portion to form a bag. (For example, Patent Documents 1 and 2). However, the gusset bag with a mouth member may swell when the contents are accommodated, and the appearance may be inferior.

On the other hand, as shown in FIGS. 21 (A) and 21 (B), a pair of opposing flat portions 111 and 111 and both side edges of the flat portions 111 and 111 are connected to each other, corresponding to each other. A gusset bag 101 with a mouth member comprising a gusset bag 110 composed of a pair of side surfaces 112, 112 folded to the side and a mouth member 120 attached to the gusset bag 110 and discharging the contents from the gusset bag 110 is provided. Known (for example, Patent Document 3).
In the gusset bag 101 with the mouth member, the side edge seal portion 113 is formed by heat-sealing the side edge portion of the flat surface portion 111 and the side edge portion of the side surface portion 112. The side edge seal portion 113 of the gusset bag with a mouth member 101 has high rigidity because the flat surface portion 111 and the side surface portion 112 are heat-sealed. 101 independence is improved. Further, since the side edge seal portion 113 serves as a support column, swelling of the body when contents are accommodated is also suppressed.

Japanese Patent Laid-Open No. 11-147547 JP 2000-72161 A JP 2004-196414 A

However, in the gusset bag 101 with the mouth member, since there is the side edge seal portion 113, pain may be felt when gripping with a hand strongly. That is, the side edge seal portion 113 has a shape protruding toward the outside of the gusset bag 110, and the side edge seal portion 113 has a high rigidity and its end 113a is relatively sharp, so that it can be gripped by hand. Pain may be felt when the end 113a bites into the hand. In particular, when the content is a jelly beverage or the like, the content is usually pushed out and eaten as if the gusset bag 110 is crushed by hand. Therefore, it is desirable to make it difficult to feel pain even if the gusset bag 110 is crushed by hand.
As a method for making it difficult to feel pain when grasped by a hand, a method of using a cylindrical gusset bag in which the flat surface portions 111 and 111 and the side surface portions 112 and 112 are all integrated and not forming the side edge seal portion 113 is used. Can be mentioned. However, in this method, since the side edge seal portion 113 that functions as a support is not provided, the self-supporting property of the gusset bag is lowered.

  The present invention relates to a method of manufacturing a gusset bag that has excellent self-supporting properties and that does not feel pain even if it is crushed by hand, and a gusset bag with a mouth member in which the mouth member is attached to the gusset bag. The purpose is to provide a manufacturing method.

The present invention employs the following configuration in order to solve the above problems.
[1] Manufactures a gusset bag with a mouth member having a pair of opposing flat portions and a pair of opposing side face portions folded inside and a mouth member attached to the gusset bag in a liquid-tight manner. A way to
In a state where a quadrangular prism-shaped mandrel is inserted into a cylindrical film material having a side edge seal portion in which a side edge portion of the flat surface portion and a side edge portion of the side surface portion are heat sealed, the side edge seal portion The manufacturing method of a gusset bag with a mouth member which has the process of turning the whole to the said plane part side or the said side part side, and adhering and fixing.
[2] The manufacturing method of a gusset bag with a mouth member according to [1], wherein the folded side edge seal portion is bonded and fixed to the flat portion or the side portion by heat sealing.
[3] A method for producing a gusset bag comprising a pair of opposed flat portions and a pair of opposed side portions folded inside.
In a state where a quadrangular prism-shaped mandrel is inserted into a cylindrical film material having a side edge seal portion in which a side edge portion of the flat surface portion and a side edge portion of the side surface portion are heat sealed, the side edge seal portion A method for manufacturing a gusset bag, comprising a step of folding the whole to the flat surface side or the side surface portion side and bonding and fixing.
[4] The method for manufacturing a gusset bag according to [3], wherein the folded side edge seal portion is bonded and fixed to the flat portion or the side portion by heat sealing.

According to the method for producing a gusset bag of the present invention, a gusset bag that has excellent self-supporting properties and is less susceptible to pain even when crushed by hand is obtained.
Moreover, according to the manufacturing method of the gusset bag with the mouth member of the present invention, the mouth member having the mouth member attached to the gusset bag which has excellent self-supporting property and hardly feels pain even if it is crushed by hand. An attached gusset bag is obtained.

It is the front view which showed an example of embodiment of the gusset bag with a mouth member of this invention. It is sectional drawing when the gusset bag with a mouth member of FIG. 1 is cut | disconnected along straight line I-I '. It is sectional drawing to which the side edge seal | sticker vicinity vicinity of the gusset bag with a mouth member of FIG. 2 was expanded. It is the perspective view which showed a mode that the content was filled into the gusset bag with a mouth member of FIG. It is the perspective view (A) and sectional drawing (B) which showed the manufacturing process of the gusset bag with a mouth member of FIG. It is the perspective view (A) and sectional drawing (B) which showed the manufacturing process of the gusset bag with a mouth member of FIG. It is the perspective view which showed the manufacturing process of the gusset bag with a mouth member of FIG. It is sectional drawing which showed the manufacturing process of the gusset bag with a mouth member of FIG. It is the figure which showed the manufacturing process of the gusset bag with a mouth member of FIG. (A), (B) Sectional drawing of the upper part of a plane part and a side part, (C) The enlarged view of the upper seal part vicinity of a gusset bag. It is sectional drawing which showed the other form of the side edge seal part of a gusset bag. It is sectional drawing which showed the manufacturing process of the gusset bag of other embodiment. It is sectional drawing which showed the manufacturing process of the gusset bag with a mouth member of FIG. Sectional drawing (A), (B) which showed other example embodiments of a gusset bag with a mouth member of the present invention, sectional drawing (C) which showed other forms of a side edge seal part, and side edge seal It is sectional drawing (D) which expanded the part. It is the perspective view (A) and sectional drawing (B) which showed the manufacturing process of the other example of the gusset bag with a mouth member of this invention. It is sectional drawing which showed the manufacturing process of the other example of the gusset bag with a mouth member of this invention. It is the front view which showed other embodiment examples of the gusset bag with a mouth member of this invention. It is sectional drawing when the gusset bag with a mouth member of FIG. 16 is cut | disconnected along straight line II-II '. It is sectional drawing to which the side edge seal | sticker vicinity vicinity of the gusset bag with a mouth member of FIG. 17 was expanded. It is sectional drawing which showed the manufacturing process of the gusset bag with a mouth member of FIG. It is sectional drawing which showed the manufacturing process of the gusset bag with a mouth member of FIG. It is the front view (A) which showed an example of the conventional gusset bag with a mouth member, and sectional drawing (B) when cut | disconnected by the straight line III-III '.

The gusset bag and the gusset bag with a mouth member of the present invention are gusset bags of the same form except for the presence or absence of the mouth member. Hereinafter, an embodiment of a gusset bag and a gusset bag with a mouth member of the present invention will be described in detail by showing an example of a gusset bag with a mouth member having a mouth member.
[First Embodiment]
As shown in FIG. 1, the gusset bag 1 with a mouth member of the present embodiment includes a gusset bag 10 and a mouth member 20 attached to the gusset bag 10 in a liquid-tight manner.
As shown in FIGS. 1 and 2, the gusset bag 10 includes a pair of opposed plane portions 11 and 11, and a pair of opposed side surface portions 12 and 12 that connect the side edges of the plane portions 11 and 11. Become. The side surface parts 12 and 12 are folded into the inner side of the gusset bag 10 so that the folding lines 12a correspond to each other. And the side edge part of the plane part 11 and the side edge part of the side part 12 are heat-sealed, and the four side edge seal parts 13 are formed. Further, the upper part of the gusset bag 10 is formed with an upper seal part 14 in which the flat part 11 and the side part 12 are sealed, and the inner surfaces of the flat part 11 and the side part 12 are heat-sealed in the lower part. A lower seal portion 15 is formed. Thereby, the gusset bag 1 with a mouth member can accommodate the contents in the gusset bag 10.

The pair of opposed flat portions 11 and 11 constitute the front surface and the back surface of the gusset bag 1 with a mouth member, respectively.
The flat part 11 is formed of a film material. Examples of the film material include a single layer film or a laminated film having a multilayer structure. The film material of the flat portion 11 is preferably a laminated film from the viewpoint that various functions can be imparted, and more preferably a laminated film having an innermost layer capable of heat sealing, a functional layer, and an outermost layer.

Examples of the film used as the innermost layer include polyolefin resins such as low density polyethylene (LDPE), medium density polyethylene, high density polyethylene, polypropylene (PP), and linear low density polyethylene (LLDPE), or a mixed resin or ionomer thereof. An unstretched film comprising at least one selected from the group consisting of a resin, an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer, an ethylene-methyl acrylate copolymer, and an ethylene-methacrylic acid copolymer. Can be mentioned.
The thickness of the innermost layer is preferably 30 to 200 μm.

As the film used as the outermost layer, a film having high mechanical suitability and printability is preferable. For example, the film which consists of synthetic resins, such as a polyester type, a polyamide type, a polypropylene type, a polycarbonate type, a polyacetal type, is mentioned. These films may be unstretched films or stretched films stretched in a uniaxial direction or a biaxial direction. The film used as the outermost layer is preferably a stretched film stretched in a uniaxial direction or a biaxial direction from the viewpoint of printability.
Specific examples include stretched plastic films such as biaxially stretched polyethylene terephthalate (PET), biaxially stretched polyamide (ONY), and biaxially stretched polypropylene (OPP).
Further, synthetic paper, cellophane, paper, non-woven fabric and the like can be used as necessary.
The thickness of the outermost layer is preferably 12 to 25 μm.

The functional layer is appropriately selected according to the required functions, such as gas barrier properties, mechanical toughness, flex resistance, puncture resistance, impact resistance, wear resistance, cold resistance, heat resistance, chemical resistance, etc. it can.
As the film used for the functional layer, for example, a metal foil such as aluminum, iron, copper, tin, polyethylene terephthalate, polyamide, polyvinyl chloride, polycarbonate, polyvinyl alcohol, saponified ethylene-vinyl acetate copolymer, or the like Films coated with polyvinylidene chloride or films deposited with inorganic materials such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, magnesium oxide, films such as polyvinylidene chloride, and heat insulation Nonwoven fabrics and foamed films are exemplified.
The functional layer may be one layer or two or more layers.
The thickness of a functional layer should just be the thickness which can satisfy | fill the function requested | required of the gusset bag 10, and 6-20 micrometers is preferable.

Moreover, the film material of the plane part 11 may use the vapor deposition film which provided the vapor deposition layer as a film used for an outermost layer instead of providing a functional layer.
Examples of the vapor deposition layer include inorganic substances such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, and magnesium oxide.
As a specific example of the film material of the flat portion 11, for example, a film composed of PET (12 μm) / Al (7 μm) / ONY (15 μm) / LLDPE (60 μm) in order from the outermost layer can be mentioned.

  As the film material of the side surface portion 12, the same materials as those mentioned as the film material of the flat surface portion 11 can be used. At least the innermost layer of the film material of the side surface portion 12 is preferably the same as the innermost layer of the film material of the flat surface portion 11 from the viewpoint of sealing properties.

  The mouth member 20 is inserted into the gusset bag 10 and includes a pouring pipe 21 for pouring the contents, and a cap 22 that is screwed onto the upper part of the pouring pipe 21 and seals the pouring outlet of the pouring pipe 21. Have. The mouth member 20 is liquid-tightly attached to the upper seal portion 14 by heat sealing in a state where the extraction pipe 21 is sandwiched between the upper edges of the flat portions 11 and 11.

As a material of the mouth member 20, at least a portion sealed with the inner surface of the flat portion 11 of the extraction pipe 21 is made of synthetic resin.
Examples of the synthetic resin that forms at least the seal portion of the outlet pipe 21 of the mouth member 20 include, for example, polyolefin resin, polyamide resin, polyester resin, (meth) acrylic resin, vinyl chloride resin, vinylidene chloride resin, polyethersulfone, Examples thereof include ethylene-vinyl alcohol copolymer. Of these, polyolefin resins are preferred because of their excellent processability and low cost.
Examples of the polyolefin resin include high-density polyethylene, medium-density polyethylene, high-pressure low-density polyethylene, linear low-density polyethylene, polyethylene-based resins such as ethylene-vinyl acetate copolymer, and ethylene-α-olefin copolymer. Olefin elastomers, polypropylene, ethylene-propylene random copolymers, polypropylene resins such as α-olefin-propylene random copolymers, and cyclic polyolefin resins. These resins may be blended for improving performance, or may be partially crosslinked for the purpose of improving heat resistance.

The mouth member 20 may be formed of a single material, or may have a multilayer structure formed of various resin layers.
The resin that forms at least the seal portion of the extraction pipe 21 of the mouth member 20 is preferably formed of the same type of resin as the resin that forms the innermost layer of the flat portion 11 in terms of sealing properties.

In the gusset bag 1 with a mouth member of the present embodiment, as shown in FIGS. 2 and 3, the folded portion 13b, which is a part in the width direction of the side edge seal portion 13, is folded back to the side surface portion 12 side and folded in that state. The portion 13b is bonded and fixed to a proximal end portion of the side edge seal portion 13.
Thereby, as shown in FIGS. 2 to 4, even when the side edge seal portion 13 protrudes toward the outside of the gusset bag 10, such as when the gusset bag 10 is filled with the contents, Therefore, the relatively sharp end portion 13 a of the side edge seal portion 13 is directed toward the gusset bag 10, and is not projected to the outside of the gusset bag 10. Then, on the outer side of the gusset bag 10, a broken line portion 13c that is rounder than the end portion 13a protrudes in place of the end portion 13a.

  In this way, when the folded portion 13b of the side edge seal portion 13 of the gusset bag 1 with a mouth member is folded and fixed as described above, the side edge seal is obtained when the gusset bag 1 with a mouth member is grasped by hand. In the portion 13, the cornered end portion 13a does not touch the hand, and the broken line portion 13c that is rounder than the end portion 13a touches the hand. Therefore, it is difficult to feel pain in the hand, and the contents can be pushed out by squeezing the gusset bag 10.

  In addition, the side edge seal portion 13 has the folded portion 13b folded back and bonded and fixed, so that in the bonded portion, the two plane portions 11 and 11 and the two side surface portions 12 and 12 total four sheets. The film materials are overlapping. Therefore, the rigidity is further increased in the portion where the folded portion 13b is bonded and fixed, and the function as a support can be sufficiently obtained. Therefore, the gusset bag with a mouth member 1 has excellent self-supporting properties.

The adhesive fixing of the folded-back portion 13b of the side edge seal portion 13 can be performed with an adhesive.
Examples of the adhesive include an adhesive in which a polyester resin is dispersed, a hot melt agent, and the like. Moreover, when the outer surface side of the flat surface parts 11 and 11 and the side surface parts 12 and 12 is a heat-sealable material, you may weld the folding | returning part 13b of the side edge seal part 13 by heat sealing.

Further, on the side edge side of the upper seal portion 14, the two plane portions 11, 11 and the side surface portion 12 folded into the inner side of the gusset bag 10 overlap, so that four film materials overlap. At this time, if the folded portion 13b of the side edge seal portion 13 is also folded and fixed also in the upper seal portion 14, the film increases by the amount of the folded portion 13b on the side edge side of the upper seal portion 14, and the eight sheets Film materials will overlap. Thus, when the number of film materials increases on the side edge side of the upper seal portion 14, the overlapping state of the film materials in the upper seal portion 14 becomes non-uniform. Further, since the number of film materials overlapping on the side edge side of the upper seal portion 14 is large, sufficient pressure is not applied to the vicinity of the center of the upper seal portion 14 at the time of sealing, and the seal is completely performed in the vicinity of the mouth member 20. There is a risk that the contents may leak without being able to.
Therefore, as shown in FIG.1 and FIG.4, in the upper seal part 14 of the gusset bag 1 with a mouth member, it is preferable that the folding | returning part 13b of the side edge seal part 13 is cut off. Thereby, since the upper seal part 14 becomes uniform and can be sufficiently sealed easily, it is easy to prevent the contents from leaking out.
For example, as shown in FIGS. 9B and 9C, the seals between the outer surfaces of the side surface portions 12 and 12 in the upper seal portion 14 are opposed to each other in the vicinity of the side edges of the opposed side surface portions 12 and 12. A punch hole is formed at a position, and a seal portion 16 is formed in which the inner surfaces 11a and 11a of the flat portions 11 and 11 are heat-sealed. Moreover, the outer surfaces of the side surface parts 12 and 12 in the upper seal part 14 may be directly bonded by an adhesive, a film having heat sealability, or a double-sided pressure-sensitive adhesive tape.

As a manufacturing method of the gusset bag of this invention, the method ((beta)) which has the following process ((beta) 1)-((beta) 4) is mentioned, for example.
(Β1) Two long film materials (C) that form a plane portion, and a plurality of film materials (D) that are long and half-folded along the longitudinal direction to form a side surface portion. Each film in which a plurality of half-folded film materials (D) are arranged in parallel between the film materials (C), and the folding lines of the half-folded film materials (D) located at both ends face inward and are parallel. The material (D) is conveyed so that the fold lines are alternately directed to the left and right, and each side edge of each film material (D) is heated along the longitudinal direction of each of the two film materials (C). Sealing process,
(Β2) In the heat-sealed film material (C) and film material (D), the side edge portions of the two film materials (D) facing each other are cut along the longitudinal direction, and the side edge seal portions are 4 A step of obtaining a plurality of cylindrical film materials having the planar portion and the side portion formed,
(Β3) a step of folding the entire side edge seal portion or a part in the width direction back to the flat surface portion side or the side surface portion side;
(Β4) A step of heat-sealing and cutting the tubular film material along the short direction to divide the tubular film material into a plurality of pieces in the longitudinal direction.
When attaching the mouth member, in the step (β4), the mouth member is attached when the upper part of the tubular film material divided into a plurality of parts is sealed.
Hereinafter, the case of the gusset bag 1 with a mouth member will be described in detail as an example.

Step (β1):
As shown in FIG. 5 (A), two long film materials (C) 11B that form a pair of opposed flat portions 11 and a pair of opposed side surfaces 12 that are long and longitudinal. A plurality of film materials (D) 12B, which are half-folded along, are conveyed by a roll or the like. At this time, a plurality of film materials (D) 12B are arranged in parallel between the two film materials (C) 11B. Further, the folding lines of the half-folded film material (D) 12B positioned at both ends are directed inward, and the folding lines of the parallel film materials (D) 12B are alternately directed to the left and right.
In this example, as shown in FIG. 5B, an adhesive is applied to the bonding portion 13d when the folded portion 13b is bonded and fixed.
Next, the side edge of each film material (D) 12B is heat-sealed along the longitudinal direction to each of the two film materials (C) 11B to seal the side edges of the gusset bag 1 with a mouth member. The heat seal part 13B to be the part 13 is formed.

Step (β2):
Cut the heat seal portion 13B of the film material (C) 11B and the film material (D) 12B along the straight line R, that is, along the longitudinal direction between the opposite side edge portions of the two film materials (D) 12B, As shown in FIGS. 7 and 8, a plurality of cylindrical film materials having plane portions 11 and 11 and side portions 12 and 12 in which four side edge seal portions 13 are formed are cut out.
At this time, the portion corresponding to the folded-back portion 13b in the side edge seal portion 13 is cut off the seal portion 13e so that the folded-back portion 13b is cut off in the upper seal portion 14 of the gusset bag with a mouth member 1. .

Step (β3):
Each folded portion 13b of the side edge seal portion 13 in the cylindrical film material obtained in the step (β3) is folded back to the side surface portion 12 side and bonded and fixed with an adhesive applied to the bonding portion 13d.

Step (β4):
For the tubular film material, along the straight line Y, that is, along the short direction with a certain distance in the longitudinal direction of the film material (C) 11B and the film material (D) 12B, the lower seal portion 15 The inner surfaces of the flat portion 11 and the side surface portion 12 of the portion to be are heat sealed. Thereafter, the film material (C) 11B and the film material (D) 12B are arranged in a short direction along the straight line Y, that is, at a certain interval in the longitudinal direction of the film material (C) 11B and the film material (D) 12B. Is cut into a plurality of pieces in the longitudinal direction to obtain a bag-like film material in which the lower seal portion 15 is formed below the flat surface portion 11 and the side surface portion 12.

Next, in the upper part of the flat portion 11 and the side surface portion 12 of the bag-shaped film material divided into a plurality, the inner surfaces of the flat surface portions 11 and the contact surfaces of the flat surface portion 11 and the side surface portion 12 are sealed and the mouth member by heat sealing. 20 is attached. Furthermore, the outer surfaces of the side surface portions 12 are sealed to form the upper seal portion 14. Examples of a method for sealing the outer surfaces of the side surface portions 12 in the upper seal portion 14 include the following methods.
As shown in FIG. 9 (A), punch holes 12b and 12b are formed in the vicinity of the side edge of the folded side surface portion 12 in the upper part of the side edge seal portion 13 so as to face each other. As shown in FIG. 9C, the side surfaces 12 are formed by contacting the inner surfaces 11a, 11a of the opposing flat surface portion 11 at the punch holes 12b, 12b and heat-sealing to form the seal portion 16. Seal the outer surfaces of each other.
As another method of sealing the outer surfaces of the side surface portions 12 in the upper seal portion 14, the outer surfaces of the side surface portions 12 are bonded and fixed using an adhesive, a film having heat sealability, or a double-sided adhesive tape. The method of doing is mentioned.
The gusset bag 1 with a mouth member is obtained by the above process.

The method (β) is preferably the method described above in terms of easy production, but is not limited to the method described above.
In the step (β4), an operation for forming the lower seal portion 15, an operation for cutting the tubular film material along the short-side direction and dividing it into a plurality in the longitudinal direction, and forming the upper seal portion 14 and a mouth member The operation of attaching 20 may be performed first or may be performed simultaneously. For example, after a cylindrical film material is cut along the short direction and divided into a plurality of lengths, the lower part of each divided cylindrical film material is sealed, and the upper part is sealed with a mouth member attached. Also good.
In addition, the operation of folding back and fixing the side edge seal portion 13 in the step (β3) is not limited to before the step (β4). For example, the tubular film material may be cut along the short direction and divided into a plurality in the longitudinal direction, and then the side edge seal portions of the divided tubular film materials may be folded and fixed. . Further, the side edge seal portion 13 may be bonded and fixed by heat sealing without using an adhesive depending on the material of the film material to be used.

Moreover, as a manufacturing method of the gusset bag of this invention other than the method ((beta)), the method ((gamma)) which has the following process ((gamma) 1)-((gamma) 4) is mentioned, for example.
(Γ1) Two long film materials (E) forming a flat surface portion and a plurality of long cylindrical film materials (F) forming a side surface portion are two film materials (E). A step of transporting a plurality of film materials (F) so as to be parallel, and heat-sealing the central portion of each film material (F) and the two film materials (E) along the longitudinal direction;
(Γ2) A cylindrical film having the flat surface portion and the side surface portion in which four side edge seal portions are formed by cutting the heat seal portion of the film material (E) and the film material (F) along the longitudinal direction. Obtaining a material,
(Γ3) a step of folding the entire side edge seal part or a part in the width direction back to the flat part side or the side part part;
(Γ4) A step of subjecting the cylindrical film material to heat sealing and cutting along the short direction and dividing the cylindrical film material into a plurality of parts in the longitudinal direction.
When attaching the mouth member, in the step (γ4), the mouth member is attached when the upper part of the tubular film material divided into a plurality of parts is sealed.
Hereinafter, the case of the gusset bag 1 with a mouth member will be described in detail as an example.

Step (γ1):
As shown in FIG. 6 (A), two long film materials (E) 11A that form a pair of opposed flat portions 11 and a pair of opposed side surfaces 12 that are long and cylindrical. The plurality of film materials (F) 12A are conveyed by a roll or the like so that the plurality of film materials (F) 12A are parallel to each other between the two film materials (E) 11A. In this example, as shown in FIG. 6B, an adhesive is applied to the bonding portion 13d when the folded portion 13b is bonded and fixed.
Next, the center portion of each film material (F) 12A and the two film materials (E) 11A are heat-sealed along the longitudinal direction to form the side edge seal portion 13 of the gusset bag 1 with a mouth member. The heat seal portion 13A is formed. In this example, the heat seal portion 13A is formed so that the central portion in the short direction is not heat sealed.

Step (γ2):
The heat seal portion 13A of the film material (E) 11A and the film material (F) 12A is cut along the straight line X, that is, along the longitudinal direction at the center portion of the heat seal portion 13A that is not heat sealed. As shown in FIGS. 7 and 8, a plurality of cylindrical film materials having plane portions 11 and 11 and side portions 12 and 12 on which four side edge seal portions 13 are formed are cut out.
At this time, the portion corresponding to the folded-back portion 13b in the side edge seal portion 13 is cut off the seal portion 13e so that the folded-back portion 13b is cut off in the upper seal portion 14 of the gusset bag with a mouth member 1. .

Step (γ3):
Each folded portion 13b of the side edge seal portion 13 in the cylindrical film material obtained in the step (γ2) is folded back to the side surface portion 12 side and bonded and fixed with an adhesive applied to the bonding portion 13d.

Step (γ4):
For the tubular film material, along the straight line Y, that is, along the short direction at a certain interval in the longitudinal direction of the film material (E) 11A and the film material (F) 12A, the lower seal portion 15 The inner surfaces of the flat portion 11 and the side surface portion 12 of the portion to be are heat sealed. Thereafter, the film material (E) 11A and the film material (F) 12A are arranged in a short direction along the straight line Y, that is, at a certain interval in the longitudinal direction of the film material (E) 11A and the film material (F) 12A. Is cut into a plurality of pieces in the longitudinal direction to obtain a bag-like film material in which the lower seal portion 15 is formed below the flat surface portion 11 and the side surface portion 12.

Next, in the upper part of the flat portion 11 and the side surface portion 12 of the bag-shaped film material divided into a plurality, the inner surfaces of the flat surface portions 11 and the contact surfaces of the flat surface portion 11 and the side surface portion 12 are sealed and the mouth member by heat sealing. 20 is attached. Furthermore, the outer surfaces of the side surface portions 12 are sealed to form the upper seal portion 14. The method of sealing the outer surfaces of the side surface portions 12 in the upper seal portion 14 can be performed in the same manner as the step (β4) in the method (β).
The gusset bag 1 with a mouth member is obtained by the above process.

The method (γ) is preferably the method described above in terms of easy production, but is not limited to the method described above.
In the step (γ4), an operation for forming the lower seal portion 15, an operation for cutting the tubular film material along the short-side direction and dividing it into a plurality in the longitudinal direction, and forming the upper seal portion 14 and a mouth member The operation of attaching 20 may be performed first or may be performed simultaneously. For example, after cutting a cylindrical film material along the short direction and dividing it into a plurality of longitudinal directions, the lower part of each divided cylindrical film material is sealed, and a mouth member is attached and the upper part is sealed Also good.
In addition, the operation of folding back and fixing the side edge seal portion 13 in the step (γ3) is not limited to before the step (γ4). For example, the tubular film material may be cut along the short direction and divided into a plurality in the longitudinal direction, and then the side edge seal portions of the divided tubular film materials may be folded and fixed. . Further, the side edge seal portion 13 may be bonded and fixed by heat sealing without using an adhesive depending on the material of the film material to be used.
In the step (γ1), when the film material (E) 11A and the film material (F) 12A are heat sealed to form the heat seal portion 13A, the width direction of the film material (F) 12A as described above. You may heat-seal continuously, without leaving a center part in the state which does not heat-seal.

Further, in the step (γ1), on both side ends of the two film materials (E) 11A, together with the film material (E) 11A and the film material (F) 12A, the same length as in the method (β). It is preferable that the film material half cut in the longitudinal direction is conveyed so that the fold line is directed inward, and the side edges of the half cut film material and the two film materials (E) 11A are also heat sealed. . Thereby, it can utilize for manufacture of a gusset bag, without leaving both the side end sides of film material (E) 11A.
As a manufacturing method of the gusset bag 1 with a mouth member, the method (β) is preferable to the method (γ).

  In the gusset bag 1 with the mouth member described above, the folded portion 13b of the side edge seal portion 13 in which the side edge portion of the flat surface portion 11 and the side edge portion of the side surface portion 12 are heat-sealed is folded back to the side surface portion 12 side and bonded and fixed. doing. Thereby, when the gusset bag 10 is grasped by hand, not the end portion 13a but the broken line portion 13c touches the hand. Since the broken line portion 13c has no corners and is rounded, even when the contents are pushed out by squeezing the gusset bag 10 by hand, it is difficult to feel pain in the hand.

In addition, the gusset bag of this embodiment is not limited to the gusset bag 1 with a mouth member mentioned above. For example, as shown in FIG. 10 (A), the folded portion 13b of the side edge seal portion 13 may be folded and fixed to the flat portion 11 side. Further, as shown in FIG. 10B, the entire side edge seal portion 13 may be folded back to the plane portion 11 side and adhered and fixed to the plane portion 11. Further, as shown in FIG. 10C, the entire side edge seal portion 13 may be folded back to the side surface portion 12 side and adhered and fixed to the side surface portion 12.
In the gusset bag of the present invention, it is preferable that the entire side edge seal portion 13 is folded back to the flat surface portion 11 side or the side surface portion 12 side.

Further, when the entire side edge seal portion 13 is folded back as shown in FIGS. 10 (B) and 10 (C), in the manufacture by the method (γ) of the gusset bag, as shown in FIG. Instead of cutting the film material (E) 11A and the film material (F) 12A, it is preferable to cut along the straight line Z, that is, so that the side edge seal portion 13 becomes shorter.
In particular, in the manufacturing method in which the entire side edge seal portion 13 is folded back to the flat surface portion 11 side or the side surface portion 12 side, as shown in FIG. It is preferable to use a method in which the entire side edge seal portion 13 is folded and fixed in a state where the quadrangular columnar mandrel 40 (support) is inserted into the film material. If this method is used, the side edge seal portion 13 can be easily folded back and fixed, so that the gusset bag with a mouth member can be manufactured more efficiently.

  Moreover, the gusset bag with a mouth member of the present embodiment is a combination of two or more of the four folding methods exemplified in FIGS. 3 and 10A to 10C in which the four side edge seal portions 13 are used. There may be. That is, in the gusset bag of the present embodiment, there may be a mixture of a folded back part of the side edge seal part 13 and a folded back part of the side edge seal part 13, and the side edge seal part 13 on the flat part 11 side. Those that fold back and those that fold back to the side surface 12 may be mixed.

Further, the number of side edge seal portions 13 is not limited to four, and may be one, two, or three. As a gusset bag with a mouth member, the number of side edge seal portions 13 is not four, one flat surface portion and a pair of side surface portions are made of one film material, and the side edges of the respective side surface portions made of the film material A gusset bag with a mouth member in which the two side edge seal portions are formed by heat-sealing the portion and the side edge portion of the other plane portion is preferable.
Specifically, as shown in FIG. 13 (A), the flat portion 11 on the side that becomes the front surface of the bag and a pair of opposing side surface portions 12 are integrated into a single film material. The side edge portions of the side surface portions 12 and 12 and the side edge portion of the other flat surface portion 11 are heat sealed to form two side edge seal portions 13, and a part of the side edge seal portion 13 is formed on the side surface portion 12. It is preferable to have a gusset bag 10A that is folded back and adhered and fixed. In the gusset bag 10A, the entire side edge seal portion 13 may be folded back, the side edge seal portion 13 may be folded back to the flat surface portion 11 side, or these forms may be mixed.
Further, as shown in FIG. 13B, the pair of side surface portions 12 facing the flat surface portion 11 on the front side of the bag is made of a single film material, and the side surface portions 12 of the film material, The side edge portion of 12 and the side edge portion of the other flat surface portion 11 are heat-sealed to form two side edge seal portions 13, and the entire side edge seal portion 13 is on the flat surface portion 11 side forming the back surface. It is particularly preferable to have a gusset bag 10B that is folded back and bonded and fixed. Since the gusset bag with a mouth member having the gusset bag 10B does not have a side edge seal portion on the front surface, the gusset bag 10B is less susceptible to pain when gripped with a hand from the front surface and has an excellent appearance. On the other hand, since the side edge seal portion is formed by the flat surface portion forming the back surface and the side surface portions on both sides thereof, excellent self-supporting property can be obtained by using the side edge seal portion as a support column. Swelling is also suppressed.

  Further, as shown in FIG. 13C, the gusset bag with a mouth member of the present invention is made of a single film material integrated with a pair of flat portions with one side faced, and the other side face side. The gusset bag 10C in which the two side edge seal portions 13 are formed by heat sealing alone, and the side edge seal portions 13 are folded and fixed to the flat surface portion side or the side surface portion side may be used.

Moreover, when the plane part 11 and the side part 12 consist of the film material integrated in either part, as shown in FIG.13 (D), the side edge part of the plane part 11 and the side part 12 of FIG. The portions corresponding to the side edge portions are heat-sealed to form the side edge seal portion 13, and the whole or a part of the side edge seal portion 13 is folded and fixed to the flat portion 11 side or the side surface portion 12 side. May be. Thereby, it is possible to improve the self-supporting property of the gusset bag with the mouth member by forming the side edge seal portion as a support column while preventing pain when the gusset bag is grasped by hand.
Further, the folded portion 13b of the side edge seal portion 13 may not necessarily be bonded and fixed to the flat surface portion 11 or the side surface portion 12 as long as the folded state can be stably maintained.

Examples of the method for producing a gusset bag in the form of the gusset bags 10A and 10B include a method (α) having the following steps (α1) to (α4).
(Α1) A long film material (A) forming one flat surface portion and a pair of side surface portions is formed so that a plurality of the one flat surface portion and a pair of side surface portions are formed in parallel along the longitudinal direction. In the folded state, the film is transported together with the long film material (B) forming the other flat surface portion, and the portion between the adjacent side surface portions in the film material (A) and the film material (B) are longitudinal. Heat sealing along the longitudinal direction, and heat sealing the film material (B) with each of the side end portions from the side portions located on both ends of the film material (A), along the longitudinal direction,
(Α2) The heat seal part of the film material (A) and the film material (B) is cut along the longitudinal direction, and the cylindrical part having the planar part and the side part in which two side edge seal parts are formed. Obtaining a plurality of film materials;
(Α3) a step of folding the entire side edge seal portion or a part in the width direction back to the flat surface portion side or the side surface portion side;
(Α4) A step of heat-sealing and cutting the tubular film material along the short direction, and dividing the tubular film material into a plurality of pieces in the longitudinal direction.
When attaching a mouth member, in the step (α4), the mouth member is attached when sealing the upper part of the tubular film material divided into a plurality.
Hereinafter, the case of a gusset bag with a mouth member having the gusset bag 10B will be described in detail.

Step (α1):
As shown in FIG. 14, a long film material (A) 17 that forms one flat surface portion 11 and a pair of side surface portions 12, 12 has a plurality of the one flat surface portion 11 and a pair of side surface portions 12, 12. In a state of being folded so as to be formed along the longitudinal direction in parallel, the film is transported by a roll or the like together with the long film material (B) 18 forming the other plane portion 11. In this example, as shown in FIG. 14B, an adhesive is applied to the bonding portion 13d when the folded portion is bonded and fixed.
Subsequently, the part between the adjacent side surface parts 12 in the film material (A) 17 and the film material (B) 18 are heat-sealed along the longitudinal direction, and the side surfaces located on both ends of the film material (A) 17. Each of the portions on the side end side from the portion and the film material (B) 18 are heat-sealed along the longitudinal direction to form a heat seal portion 13C to be the side edge seal portion 13.

Step (α2):
The heat seal portion 13C of the film material (A) 17 and the film material (B) 18 is cut along the straight line Q, that is, along the longitudinal direction at the central portion of the heat seal portion 13C, as shown in FIG. A plurality of cylindrical film materials having the flat surface portions 11 and 11 and the side surface portions 12 and 12 formed with two side edge seal portions 13 are cut out.
Further, if necessary, as in the method (β), a part of the portion corresponding to the side edge seal portion 13 is cut out so that no folded portion remains in the upper seal portion of the gusset bag with a mouth member. Go.

Step (α3):
The entire side edge seal portion 13 of the cylindrical film material obtained in the step (α2) is folded back to the flat portion 11 side and bonded and fixed with an adhesive applied to the bonding portion 13d.

Step (α4):
In the same manner as in the step (β4) of the method (β), the bag-like film material in which the lower seal portion 15 is formed by performing heat sealing and cutting along the short side direction and dividing into plural pieces in the longitudinal direction. Get. Thereafter, in the same manner as in the step (β4) of the method (β), the upper seals of the flat surface portion 11 and the side surface portion 12 and the mouth member 20 are attached.

The method (α) is also preferably the method described above in terms of easy production, but is not limited to the method described above.
In the step (α4), an operation for forming the lower seal portion 15, an operation for cutting the cylindrical film material along the short side direction and dividing it into a plurality in the longitudinal direction, and forming the upper seal portion 14 and a mouth member The operation of attaching 20 may be performed first or may be performed simultaneously. For example, after cutting a cylindrical film material along the short direction and dividing it into a plurality of longitudinal directions, the lower part of each divided cylindrical film material is sealed, and a mouth member is attached and the upper part is sealed Also good.
In addition, the operation of folding and bonding the side edge seal portion 13 in the step (α3) is not limited to before the step (α4). For example, the tubular film material may be cut along the short direction and divided into a plurality in the longitudinal direction, and then the side edge seal portions of the divided tubular film materials may be folded and fixed. . Further, the side edge seal portion 13 may be bonded and fixed by heat sealing without using an adhesive depending on the material of the film material to be used.

[Second Embodiment]
Next, another embodiment of the gusset bag with a mouth member of the present invention will be described. In this embodiment, about the same thing as the said gusset bag 1 with an opening member, the same code | symbol is attached | subjected and description is abbreviate | omitted.
As shown in FIG. 16, the gusset bag 2 with a mouth member of the present embodiment includes a gusset bag 30 and a mouth member 20 attached to the gusset bag 30 in a liquid-tight manner.
As shown in FIGS. 16 and 17, the gusset bag 30 includes a pair of opposed flat portions 31, 31 and a pair of opposed side portions 32, 32 that connect the side edges of the flat portions 31, 31. Have. The side surfaces 32 and 32 are folded inside the gusset bag 30 so that the folding lines 32a correspond to each other. The four side edge seal portions 33 are formed by heat-sealing the side edge portion of the flat surface portion 31 and the side edge portion of the side surface portion 32. Moreover, the upper part of the gusset bag 30 is formed with an upper seal part 34 in which the flat part 31 and the side part 32 are sealed together, and the inner surfaces of the flat part 31 and the side part 32 are heated in the lower part. A sealed lower seal portion 35 is formed. Thereby, the gusset bag 2 with a mouth member can accommodate the contents in the gusset bag 30.

  The film material of the plane part 31 and the side part 32 can use the same thing as the film material of the plane part 11 and the side part 12 of the gusset bag 1 with a mouth member, and its preferable aspect is also the same. That is, the gusset bag 2 with a mouth member is the same as the gusset bag 1 with a mouth member except for the form of the side edge seal portion 33.

  As shown in FIGS. 17 and 18, the side edge seal portion 33 of the gusset bag with mouth member 2 is a non-sealed portion 33 b that is not heat-sealed along the vertical direction in the middle of the width direction of the side edge seal portion 33. have. The side edge seal portion 33 is folded and fixed to the side surface portion 32 along the non-seal portion 33b. That is, in order from the base end side of the side edge seal portion 33 to the tip end, there are a heat-sealed seal portion 33a, a non-heat-sealed non-sealed portion 33b, and a heat-sealed folded portion 33c. The folded portion 33c is bonded and fixed by being folded along the portion 33b.

In the gusset bag 2 with the mouth member, the tip of the portion of the side edge seal portion 33 that protrudes outward from the gusset bag 30 is a non-seal portion 33b. Since the non-seal portion 33b is not heat-sealed, it has a lower rigidity and is softer than the broken line portion 13c of the side edge seal portion 13 of the gusset bag 1 with a mouth member.
Moreover, in the gusset bag 2 with a mouth member, since the sealing part 33a and the folding | returning part 33c are heat-sealed, since those parts fully fulfill | perform the function as a support | pillar, it has the outstanding self-supporting property.

The production of the gusset bag 2 with the mouth member is a method (except for the form of the heat seal portion formed in the step (β2) and the step (γ2), and the method of folding the side edge seal portion in the step (β3) and the step (γ3)). It can carry out similarly to manufacture of the gusset bag 1 with a mouth member by (beta) and (gamma). When using the said method ((gamma)), the method shown below is mentioned, for example.
Step (γ1):
As shown in FIG. 6 (A), two long film materials (E) 31A that form a pair of opposed flat portions 31 and a cylindrical long shape that forms a pair of opposed side portions 32. The plurality of film materials (F) 32A are conveyed by a roll or the like so that the plurality of film materials (F) 32A are arranged in parallel between the film materials (E) 31A. In this example, as shown in FIG. 19, an adhesive is applied to the bonding portion 33d when the folded portion 33c is bonded and fixed.

  Then, the central portion of the film material (F) 32A and the film material (E) 31A are heat-sealed along the longitudinal direction to form a heat seal portion that becomes the side edge seal portion 33. At this time, the heat seal part is formed in the short direction in a heat sealed part 33A, a non-heat sealed non-seal part 33B, a heat sealed part 33C, a non-heat sealed non-seal part 33B, and a heat seal. The sealed portion 33A is formed in this order.

Step (γ2):
The heat seal part of the film material (E) 31A and the film material (F) 32A is cut along the straight line P, that is, along the longitudinal direction at the center of the short side direction of the film material (F) 32A, as shown in FIG. As shown, a plurality of cylindrical film materials having flat portions 31 and 31 and side portions 32 and 32 on which four side edge seal portions 33 are formed are cut out.
Further, as in the case of manufacturing the gusset bag 1 with a mouth member, a part of the folded portion 33c is cut out so that the folded portion 33c does not remain in the portion of the upper seal portion 34 of the gusset bag 2 with a mouth member. Go.

Step (γ3):
Each folded portion 33c of the side edge seal portion 33 in the cylindrical film material obtained in the step (γ2) is folded to the side surface portion 32 side along the non-seal portion 33b, and the adhesive applied to the adhesive portion 33d is used. The folded portion 33c is bonded and fixed.

Step (γ4):
As in the case of manufacturing the gusset bag 1 with the mouth member, the plane portion 31 of the portion that becomes the lower seal portion 35 is formed along the short direction with a certain interval in the longitudinal direction with respect to the tubular film material. And the inner surfaces of the side surface portion 32 are heat-sealed, and further, the portion is cut along the short-side direction, so that it is divided into a plurality of portions in the longitudinal direction, and is formed below the flat surface portion 31 and the side surface portion 32. A bag-like film material in which the lower seal portion 35 is formed is obtained.
Next, in the upper part of the plane part 31 and the side part 32 of the bag-shaped film material divided into a plurality, the inner surfaces of the plane parts 31 and the seal between the contact parts of the plane part 31 and the side part 32 and the mouth member by heat sealing 20 is attached. Further, the outer surfaces of the side surface portions 32 are sealed to form the upper seal portion 34. The method of sealing the outer surfaces of the side surface portions 32 in the upper seal portion 34 is to form a punch hole facing the side surface portion 32 in the upper portion of the side edge seal portion 33, as in the case of manufacturing the gusset bag 1 with a mouth member. A method of heat-sealing by bringing the inner surfaces of the flat portion 31 into contact with each other in the punch holes is mentioned. Moreover, you may use the method of adhere | attaching and fixing the outer surfaces of the side part 32 using the adhesive agent, the film which has heat-sealing property, or a double-sided adhesive tape.
The gusset bag 2 with a mouth member is obtained by the above process.

In addition, the manufacturing method of the gusset bag 2 with a mouth member is not limited to the method mentioned above similarly to the case of manufacturing the gusset bag 1 with a mouth member.
The operation in the step (β4), the operation of forming the lower seal portion 35, the operation of cutting the cylindrical film material along the short direction and dividing it into a plurality of portions in the longitudinal direction, and the upper seal portion 34 and the mouth The operation of attaching the member 20 may be performed first or simultaneously. For example, after cutting a cylindrical film material along the short direction and dividing it into a plurality of longitudinal directions, the lower part of each divided cylindrical film material is sealed, and a mouth member is attached and the upper part is sealed Also good.
In addition, the operation of folding back and fixing the folded portion 33c of the side edge seal portion 33 in the step (β3) is not limited to before the step (β4). For example, a cylindrical film material is cut along the short direction and divided into a plurality of lengths, and then the folded portions 33c of the side edge seal portions 33 of the divided cylindrical film materials are folded and bonded. It may be fixed. Further, the side edge seal portion 13 may be bonded and fixed by heat sealing without using an adhesive depending on the material of the film material to be used.

  Also in the case of manufacturing the gusset bag 2 with the mouth member, in the step (γ1), the film material (E) 31A and the film material (F) are provided on both side ends of the two film materials (E) 31A. Along with 32A, a long and half-cut film material is transported so that the fold line faces inward, and the side edges of the half-cut film material and the two film materials (E) 31A are also heated. It is preferable to seal. Thereby, it can utilize for manufacture of a gusset bag, without leaving both side edge sides of film material (E) 31A. The heat-sealed formation of the side edges of the half-cut film material and the two film materials (E) 31A includes a seal portion that is heat-sealed, a non-sealed portion that is not heat-sealed, and a seal that is heat-sealed. The parts are formed in this order.

  In the gusset bag 2 with the mouth member described above, the folded portion 33c of the side edge seal portion 33 obtained by heat-sealing the side edge portion of the flat surface portion 31 and the side edge portion of the side surface portion 32 is provided along the non-sealed portion 33b. The folded portion 33c is bonded and fixed to the side 32. Thereby, when the gusset bag 2 with the mouth member is grasped by hand, the non-sealed portion 33b having a low rigidity and a roundness is not touched without being heat-sealed. Therefore, it is difficult to feel pain in the hand, and the contents can be pushed out by squeezing the gusset bag 2 with the mouth member by hand.

In addition, the gusset bag with a mouth member of this embodiment is not limited to the gusset bag 2 with a mouth member described above. For example, the folded portion 33c may be folded and fixed to the flat surface portion 11 side. Further, the four side edge seal portions 33 may include a mixture of the folded portion 33c folded back to the flat surface portion 11 side and a folded portion folded back to the side surface portion 12 side.
Further, the number of side edge seal portions 33 is not limited to four, and may be one, two, or three. For example, a film material integrated with a pair of flat portions facing one side surface is used, and the side edge seal portion 33 is formed by heat sealing only on the other side, and the folded portion 33c extends along the non-sealed portion 33b. It may be folded back and adhered and fixed.

  Moreover, when using the film material which the plane part 31 and the side part 32 are integrated in any part, the parts corresponding to the side edge part of the plane part 31 and the side edge part of the side part 32 are heat-sealed. The side edge seal portion 33 may be formed, and the folded portion 33c of the side edge seal portion 33 may be folded and fixed to the flat surface portion 31 side or the side surface portion 32 side along the non-seal portion 33b. Thereby, it is possible to improve the self-supporting property of the gusset bag by forming the side edge seal portion that becomes the support column while preventing the user from feeling pain when the gusset bag is grasped by hand.

  Moreover, the gusset bag with a mouth member of the present invention has a gusset bag in which the side edge seal portion folded described in the first embodiment and the side edge seal portion folded described in the second embodiment are mixed. It may be a gusseted bag with a member.

  Moreover, the gusset bag of this invention is a bag of the same form as the above-mentioned gusset bag with a mouth member except not having a mouth member. The gusset bag may have a notch or tear line for opening the bag.

  DESCRIPTION OF SYMBOLS 1, 2 Gazette bag with a mouth member 10 Gazette bag 11 Plane part 12 Side part 13 Side edge seal part 13a End part of side edge seal part 13b Folding part 13c Folding line part 14 Upper seal part 15 Lower seal part 20 Mouth member 30 Gazette bag 31 Plane part 32 Side part 33 Side edge seal part 33a Seal part 33b Non-seal part 33c Folding part 40 Mandrel

Claims (4)

A method of manufacturing a gusset bag with a mouth member having a pair of opposing flat portions and a pair of opposing side face portions folded inside and a mouth member attached liquid-tightly to the gusset bag. There,
In a state where a quadrangular prism-shaped mandrel is inserted into a cylindrical film material having a side edge seal portion in which a side edge portion of the flat surface portion and a side edge portion of the side surface portion are heat sealed, the side edge seal portion The manufacturing method of a gusset bag with a mouth member which has the process of turning the whole to the said plane part side or the said side part side, and adhering and fixing.   The manufacturing method of the gusset bag with a mouth member according to claim 1, wherein the folded side edge seal portion is bonded and fixed to the flat surface portion or the side surface portion by heat sealing. A method for producing a gusset bag comprising a pair of opposed flat portions and a pair of opposed side portions folded inside,
In a state where a quadrangular prism-shaped mandrel is inserted into a cylindrical film material having a side edge seal portion in which a side edge portion of the flat surface portion and a side edge portion of the side surface portion are heat sealed, the side edge seal portion A method for manufacturing a gusset bag, comprising a step of folding the whole to the flat surface side or the side surface portion side and bonding and fixing.   The manufacturing method of the gusset bag of Claim 3 which adhere | attaches and fixes the said side edge seal part turned back to the said plane part or the said side part by heat sealing.

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