JP2019048477A - Manufacturing method of pouch - Google Patents

Abstract

To provide a pouch manufacturing method capable of efficiently manufacturing a pouch having an excellent flexural rigidity and shape retainability, or self-standing property of the folding part.SOLUTION: In a method for manufacturing a pouch having a folding part made by being folded by a bending line along a side seal part, it is characterized in that the method comprises a first folding processing at an end part of the intermediate pouch in a width direction made by being folded by a first bending line positioned in the pouch inner side than an inner end edge of the side seal part, and a second folding processing made by being folded by a second bending line positioned in the pouch inner side than the first bending line and in parallel with the first bending line after the first folding processing, in which a second molding die that performs the second folding processing is located on the inner side of the pouch by a distance between the first bending line and the second bending line than a first molding die that performs the first folding processing, and the second molding die has the same size and shape as the size and shape of the first molding die, from the upstream to the downstream of the transport direction of the intermediate pouch.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a pouch and a method of manufacturing the same, and more particularly to a method of manufacturing a pouch that is excellent in feel at the time of gripping, bending rigidity, or self-supporting property.

  BACKGROUND ART A pouch-shaped container (pouch) formed by laminating resin films and sealing end portions has been widely used in various applications such as daily necessities such as detergents and shampoos, and foodstuffs such as seasonings. In order to make such a bag-like container self-supporting, a two-fold bottom film is interposed between two side films, and a standing pouch sealed by a side seal portion and a bottom seal portion, or a resin film is three-sided Sealed, four-sided sealed flat pouches are widely known.

  And in the said standing pouch, even if self-supporting property is ensured, since the resin film which comprises a pouch has flexibility, it is easy to produce a fold and a buckling in a side film in the self-supporting state. There is a problem of In order to solve such a problem, for example, there has been proposed a standing pouch formed by forming a folded portion in which the side seal portion of the pouch is folded at a folding line located inside the pouch rather than the side seal portion (patent document 1)

International Publication No. 2008/001829

  In the standing pouch, the pouch is prevented from buckling, the side film is not broken, and the folds of the folded portion are softened to improve the gripping feeling and further improve the bending rigidity. In order to make it possible, the pouch side end portion is bent at a bending line located on the inner side of the pouch than the side seal portion. However, in large-capacity large-sized pouches, bending rigidity is lowered and gripping property is poor, and when retort sterilization is performed, shape retention of the folded portion after retort sterilization is reduced, and further, in standing pouches There was a problem that independence could not be maintained.

  Therefore, an object of the present invention is to provide a manufacturing method capable of efficiently manufacturing a pouch excellent in bending rigidity and shape-retaining property of a folded portion or self-supporting property.

  According to the present invention, in the method of manufacturing the pouch in which the bending process is performed at the bending line along the side seal portion, the first bending line located inward of the inner edge of the side seal portion is the intermediate pouch A first bending process for bending the end in the width direction, and a second bending line parallel to the first bending line and located on the inward side of the pouch with respect to the first bending line, the first bending process And a second bending process for bending the folded portion after the bending process, wherein the second mold for performing the second bending process is more than the first mold for performing the first bending process. The inward side of the pouch by a distance between the first folding line and the second folding line, and the same as the shape of the gap of the first mold from the upstream toward the downstream of the transport direction of the intermediate pouch Characterized by having a shape of That the production method of the pouch is provided.

In the method of manufacturing the pouch of the present invention,
1. The bending process uses a mold having a gap that changes from upstream to downstream in the transport direction of the intermediate pouch, and the pouch width direction end portion outside at least the folding line of the intermediate pouch passes through the gap. By gradually reducing the bending angle formed by the folded portion around the bending line and the side film of the pouch,
2. Providing a heat exchange mechanism for heating and cooling the bent portion;
Is preferred.

  In the pouch of the present invention, the folding line along the side seal portion is positioned inward of the pouch than the inner edge of the side seal portion, and the folded portion further has a multiple structure in which it is folded back. Gender, feel at the time of gripping, and bending rigidity are significantly improved.

  In the pouch of the present invention, the folded portion has a multiple structure, which enables the edge of the side seal to be positioned inside the multiple structure, and the cut edge of the film is exposed to the outer surface of the pouch There is no risk that the hand feels soft and there is no risk of catching on.

  Furthermore, in the method of producing a pouch of the present invention, it is possible to form a folded portion having a multiple structure continuously with a normal folded portion, and easily produce an intermediate pouch in which the cutting edge is not exposed. Can.

It is a figure which shows the intermediate | middle pouch in the pouch of this invention, (A) is a side view, (B) is the schematic of the side cross section in the XX cross section of (A). Schematic of the cross section for demonstrating the multiple structure of the folding | returning part of the pouch of this invention. The top schematic diagram of the bending apparatus used for the manufacturing method of the pouch of this invention. Sectional drawing for demonstrating the change of the shape of the clearance gap in the metal mold | die shown in FIG. The figure for demonstrating the bending in the metal mold | die of the bending process apparatus shown in FIG.

(Pouch)
As described above, in the pouch of the present invention, the folding line along the side seal portion is positioned inward of the pouch than the inner edge of the side seal portion, and the folded portion further has a multi-folded structure folded back. Is an important feature.
FIG. 1 is a view showing an example of an intermediate pouch in the folded portion of the present invention, for example, an intermediate pouch in a standing pouch. The intermediate pouch 1 shown in FIG. 1 is located in a state where the bottom film 3 is folded between the side films 2a and 2b at the folding line 8, and the side seal portions 4a and 4b are obtained by bonding both ends of the side films 2a and 2b. And the bottom seal | sticker part 6 which joined side film 2a, 2b and the bottom film 3 is formed.

  In such a standing pouch, the above-described intermediate pouch is subjected to bending along the bending lines 7a and 7b from the viewpoint of improving the self-supporting property of the pouch and softening the hand when gripping. The folding lines 7a and 7b extend in the axial direction along the side seal parts 4a and 4b of the pouch, and are positioned on the pouch inner side (the storage part side) with respect to the inner end edge of the side seal part. And improve independence.

Further, the folded portion is formed by bending the intermediate pouch, an example of which is shown in FIG. 1 at bending lines 7a and 7b, and is a pouch width direction end including a side seal portion outside the bending lines 7a and 7b. The part constitutes the folding part.
Then, in the pouch of the present invention, the folded portion subjected to the bending process at the folding lines 7a and 7b is further subjected to the same bending process so that the folded portion has a multiple structure. As a result, the rigidity of the folded portion is significantly improved, and the cut edge of the side film can be positioned inside the multiple structure, so that the contact is soft when grasped, and catching is effectively prevented. Furthermore, in the case where the pouch is a standing pouch, self-supporting and occurrence of buckling and wrinkles during self-supporting are more effectively prevented

That is, when it demonstrates based on FIG. 2 for demonstrating the multiplex structure of the folding part of a pouch, the folding part 12 once processed by bending line 7a, 7b shown in FIG. 1 is shown to FIG. 2 (A) As such, it has a single structure.
Although the distance from the side seal 4a, 4b inner edge of the bending line 7a, 7b varies depending on the size of the pouch, the width of the side seal, etc., the pouch inner side from the inner edge of the side seal Is preferably 1.5 to 2.5 mm.
Next, the portion of the folded portion 12 formed by one bending process shown in FIG. 2A is further bent by using the second bending line 13 shown in FIG. 2A as an axis. As shown to (B), folding part 12 'is formed in double structure.
Further, as shown in FIG. 2 (C), the second bending line 14 formed in the folded portion 12 formed by the one-time bending shown in FIG. 2 (A) is used as an axis for further bending. The folded portion 12 ′ ′ is formed in a triple structure.

  In the pouch of the present invention, the outlet for contents is formed above the pouch, but in the present invention, the shape and location of the outlet are the properties of the contents to be stored, the size of the pouch, etc. A conventionally known shape etc. can be adopted according to the application of the above. In the case of providing the spout at the upper corner of the pouch, it is desirable from the point of the pouring property that the above-mentioned folded portion is formed up to the lower part avoiding the spout.

Furthermore, in the case of a standing pouch, the pouch of the present invention is preferably joined and fixed to the side film at least at the portion where the bottom film is located, from the viewpoint of improving the self-supporting property. It is desirable that the axial direction from the bottom to the top, or the portion where the bottom film is located and the upper end of the folded portion be fixedly joined to the side film.
In the present invention, although the standing pouch is described as an example, the invention is also applicable to a flat pouch in which a resin film is sealed three-way and four-way.

The pouch of the present invention may be a resin film used in conventionally known pouches, and is not limited thereto, but is a single layer film made of a thermoplastic resin having a heat sealability, or has a heat sealability of these A thermoplastic resin film can be used as the inner layer of a pouch, and the laminated film which has the laminated constitution of two or more layers which laminated | stacked the other film can be used.
As a thermoplastic resin having heat sealability, for example, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-based non-ethylene resin Examples thereof include olefin resins such as olefin resins grafted and modified with a saturated carboxylic acid or an anhydride thereof, ionomer resins, polyamide to copolyamide resins having a relatively low melting point to a low softening point, polyesters to copolyester resins, and the like.
As the laminated film, the film made of the heat sealable thermoplastic resin can be used as the inner layer of the pouch, and various thermoplastic resins, metal foils such as aluminum foil, paper, cellophane, etc. can be used as the outer layer or the intermediate layer. . When a gas barrier property is given to the pouch, a layer comprising a gas barrier resin such as ethylene vinyl alcohol copolymer, nylon or cyclic olefin copolymer, a resin layer having a metal oxide deposited film such as aluminum or silicon oxide, clay A conventionally known laminated film including a resin layer containing a mineral and a metal foil such as aluminum can be used.

(Production method)
In the method of manufacturing the pouch of the present invention, the gap changing from upstream to downstream in the transport direction of the intermediate pouch at the position of the folding line parallel to the side seal portion and inward of the inner edge of the side seal portion Bending process of the pouch width direction end part which bends the side seal part of the middle pouch to one side using the mold having one side and gradually reduces the bending angle formed by the folded part around the bending line and the side film of the pouch Will be applied. Then, this bending process is at least a first bending process in which the bending process is performed at a first bending line, a second bending process parallel to the first bending line, and a second bending line located inward of the pouch than the first bending line A second bending process is performed to bend the folded portion after the first bending process with the second bending line.
The bending apparatus performing this bending process is formed by bending at least the side seal portion of the intermediate pouch toward the side film side along a bending line parallel to the conveying direction while conveying the intermediate pouch. Stabilize the shape of the folded portion.

  FIG. 3 is a top view showing an example of a folding apparatus used for producing the standing pouch of the present invention. In the specific example shown in FIG. 3, a first bent portion 200A and a second bent portion 200B are provided in series from the upstream to the downstream of the pouch transport direction (arrow Z in the figure). A folding mechanism 200 provided with a plurality of transport rolls 220 for transporting the pouch is provided, and a heating mechanism 300 for stabilizing the folded state of the formed folded portion is provided downstream thereof. Although not shown, a heating device is installed on the upstream side of the bending device, and the width direction end of the pouch to be subjected to bending processing of the intermediate pouch conveyed to the bending device can be bent. It is heated to a temperature and supplied to a bending device. The supply of the intermediate pouch to the folding apparatus may be supplied from either the bottom side or the pouch upper side. However, in the case of a standing pouch, air is supplied from the opening for filling the contents on the upper side of the intermediate pouch, and supplied to the folding device from the bottom side to prevent the pouch from expanding or foreign matter from entering. Is preferred.

  In the embodiment shown in FIG. 3, the bending process is performed twice in the two bending sections 200A and 200B, and it is possible to form a pouch in which the folding section 12 has a multiple structure. When the bending process is performed only once, the bending process portion may be one. Further, the heating mechanism 300 includes a pair of rotation mechanisms 320 and a plurality of heating blocks 330 for conveying the sandwiching portion 12 while sandwiching the folding portion 12, and the heating block 330 can stabilize the bent state of the folding portion 12. In order to further stabilize the bent state of the folded portion 12 described above, cooling may be performed after the heating of the folded portion 12. Furthermore, a heating device may be installed on the upstream side of the bending device, and cooling may be performed after the folded portion 12 is formed. As described above, after the formation of the folded back portion 12, a heat exchange mechanism that performs heating and cooling as needed is provided.

  Each of the first bending portion 200A and the second bending portion 200B is capable of storing the widthwise end of the intermediate pouch positioned at least outside of the bending line in the conveyance path of the intermediate pouch. It has a first mold 210A, 210A and a pair of second molds 210B, 210B. Each of the pair of molds 210A, 210A and the pair of molds 210B, 210B has a gap that changes from the upstream side to the downstream side in the transport direction (arrow Z in the figure) of the intermediate pouch. When the widthwise end of the intermediate pouch passes through the molds 200A and 200B, the bending angle formed by the folded portion with the folding line as an axis and the side film of the pouch is gradually decreased to achieve the bending line. A bending process is performed in which the widthwise end portion on the outer side is bent to the side film side.

FIG. 4 is a view for explaining the shape change of the gap of the first mold 210A and the second mold 210B shown in FIG. 3, and FIG. 4 (A) shows the pouch of the first mold 210A. (A) to (d) schematically show the cross sections at positions near (a) to (d) shown in FIG. 3, and the gap 230A is from the upstream side to the downstream side. Change continuously while taking the shape of the cross sections (a) to (d).
That is, in FIG. 4A, in the cross section (a), the widthwise end of the pouch 1 is in the gap of the mold 210A, and in the cross section (b), the gap is L-shaped downward Along the shape of 230A, the folded portion 12 is bent downward about the bending line 7a. Furthermore, in the cross section (c), it is bent so as to reduce the angle between the folded portion 12 and the side film of the pouch 1. Finally, as shown in the cross section (d), the folded portion 12 is bent so as to be substantially parallel to the side film of the pouch 1, and the first bending process is completed.

Next, as shown in FIG. 4 (B), the pouch 1 subjected to the first bending process by the first mold 210A is transported to the second mold 210B and is shown in FIG. 2 (A). A bending process similar to the first bending process is performed with the position of the bending line 14 as an axis. As shown in FIG. 4B, the gap 230B formed in the second mold 210B has a cross-section (a) from the upstream toward the downstream, similarly to the gap 230A formed in the first mold 210A. It changes continuously, taking the shape of-(d). In the embodiment shown in FIG. 4, the fold 12 "forms a triplex triple structure and the cut edge of the film is within the fold.
Although not shown, the two molds of the first mold 210A and the second mold 210B that perform bending processing at the two bending portions 200A and 200B described above are configured by one mold 210. It is good.
Also, instead of the heating block 330 described above, a heat exchange mechanism may be provided to heat the gap portion where the folding line of the intermediate pouch is located in the gap between the two molds 210A, 210B or one mold 210. .

FIG. 5 is a view for explaining the process in which the widthwise end of the intermediate pouch 1 in the first mold 210A and the second mold 210B shown in FIG. 4 is folded, and in this embodiment, the second The bending line is bent at the position of the bending line 13 shown in FIG.
The bent state (a) to (d) of the pouch end by bending in the first mold 210A corresponds to the cross sections (a) to (d) of the mold 210A in FIG. It can be seen that the pouch being conveyed from upstream to downstream is gradually folded as the shape of the gap 230A of the mold 210A changes. When the bending process in the first mold 210A is completed, the bending process is similarly performed in the second mold 210B, and in this embodiment, the folded portion 12 'is formed into a double structure shown in FIG. 2 (B). Be done.

As described above, the gaps formed in the first mold 210A and the second mold 210B have the same shape change, but as apparent from FIG. 5, in the second mold 210B. The plurality of bendings are formed so that the gap is positioned on the inner side of the first mold 210A by the distance between the first bending line 7a and the second bending line 13a (7b and 13b). Desirable for continuous operation.
In addition, although the method of manufacturing the pouch of the present invention has been described by exemplifying the standing pouch, it is also applied to a method of manufacturing a flat pouch in which a resin film is sealed three-way and four-way.
Then, the folded intermediate pouch is completed by forming a spout according to the contents on the upper portion of the pouch.

  The pouch of the present invention is excellent in feel at the time of gripping, bending rigidity, or self-supporting property, and can be suitably used particularly for large pouches, and suitable for daily products such as detergents and shampoos, and foodstuffs such as seasonings It can be used.

  DESCRIPTION OF SYMBOLS 1 middle pouch, 2 side film, 3 bottom film, 4 side seal part, 6 bottom seal part, 7 bending line, 8 fold line, 10 storage part, 12 folding part, 13, 14 second bending line, 210 mold , 230 gap.

Claims (3)

In the manufacturing method of the pouch in which the bending process was given by the bending line along a side seal part,
A first bending process for bending the widthwise end of the intermediate pouch at a first bending line located inward of the inner edge of the side seal portion;
A second bending process for bending the folded portion after the first bending process with a second bending line parallel to the first bending line and located on the inward side of the pouch than the first bending line Equipped with
The second mold to be subjected to the second bending process is inward of the pouch by a distance between the first bending line and the second bending line than to the first mold to be subjected to the first bending process. A method of manufacturing a pouch, which is located on the side and has the same shape as the shape of the gap of the first mold from the upstream toward the downstream of the transport direction of the intermediate pouch.   The bending process uses a mold having a gap that changes from upstream to downstream in the transport direction of the intermediate pouch, and the pouch width direction end portion outside at least the folding line of the intermediate pouch passes through the gap. The manufacturing method of the pouch according to claim 1, which is performed by gradually decreasing the folding angle formed by the folded portion having the folding line as the axis and the side film of the pouch.   The manufacturing method of the standing pouch of Claim 1 or 2 provided with the heat exchange mechanism which heats and cools the bending part by the said bending process.