JP2014218292A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag capable of achieving good easy-peelability in both of a vertical seal part and a lateral seal part, and having high reliability that additives such as chips and pigment do not transfer to a content from the end face of a resin film.SOLUTION: Provided is an envelope sticking type packaging bag which has easy-peelability. The end of one of the overlapped resin films is sealed in the state of being folded in advance. By folding the end of one of the overlapped resin films, easy-peeling layers on inner faces are sealed in contact with each other, and the overlapped part has a shape along the outer face of the packaging bag. The overlapped part may be fused on the outer face of the packaging bag.

Description

  The present invention relates to a packaging bag using a resin film, for example, a packaging bag including an easy peel seal portion that can be easily opened without using a tool such as scissors.

  Some packaging bags include an easy-peeling seal portion (easy opening portion) in consideration of the convenience of opening. This is because when the packaging bag is formed by so-called envelope pasting formed by overlapping the end portions of the resin film, or by joining the layers on the contents side of the film end portions together, It is configured by forming an easy peel seal layer (easy peel layer). Here, the easy-peeling seal is a weak seal having a strength that can be opened by grasping and pulling the vicinity of the seal portion, and an easy-peel suitable resin composed of a plurality of resins is used as the seal layer. It is formed by using or reducing the temperature and pressure at the time of sealing.

  In Patent Document 1, an envelope is attached in which a part of a film is overlapped by curving the film into a cylindrical shape and overlapping ends, and a plurality of easy-peeling vertical seal portions are formed at the overlapped portion. A type of packaging bag is disclosed.

Japanese Utility Model Publication No. 64-53075

  By the way, as a sealing form in a packaging bag, an envelope pasting method and a palm-pasting method are known as described above, but an envelope pasting method is preferred from the viewpoint of simple sealing process and good appearance. . However, when the envelope pasting method is adopted, the end face of the resin film that has entered inside comes into direct contact with the contents, and chips and additives (pigments etc.) added to the resin film are transferred to the contents. There is a fear. The transfer of chips and additives to the contents causes the quality of the contents to be impaired.

  In addition, the above-described envelope-attached type packaging bag has a problem in that it is difficult to obtain uniform sealing properties because the sealing conditions are different between the vertical seal portion and the horizontal seal portion. Specifically, in the case of an envelope-attached type packaging bag, in the horizontal seal portion, the inner surfaces (easy peel layers) are in contact with each other, and a predetermined easy peel property is obtained, whereas in the vertical seal portion Has a problem that the inner surface of one end of the resin film and the outer surface of the other end are in contact with each other, and a predetermined easy peel property cannot be obtained.

  The present invention has been proposed in view of such a conventional situation, and can provide good easy peelability in any seal portion, and additives such as chips and pigments from the end face of the resin film. An object is to provide a packaging bag that does not shift to contents.

  In order to achieve the above-described object, the packaging bag of the present invention is an envelope-pasting packaging bag having an easy peel property, and is sealed in a state where one end of the resin film to be overlapped is folded in advance. It is characterized by that.

  In the packaging bag of the present invention, sealing is performed in such a manner that the easy peel layers on the inner surface are in contact with each other even in the vertical seal portion. Sex is imparted. Further, since the end portion of the resin film does not enter the inside in the vertical seal portion, additives such as chips and pigments do not migrate to the contents from the end surface of the resin film.

  Further, in the packaging bag of the present invention, since one end portion of the resin film to be overlapped is folded in the vertical seal portion and the other end portion of the resin film is overlapped and sealed here, the envelope pasting method It can be sealed by the same method as above, and the appearance is close to that of the envelope attachment method.

  According to the present invention, it is possible to obtain a good easy peel property in both the vertical seal portion and the horizontal seal portion, and the reliability that additives such as chips and pigments do not migrate to the contents from the end face of the resin film. It is possible to provide a highly packaging bag.

It is a schematic perspective view which shows an example of the packaging bag to which this invention is applied. It is a schematic sectional drawing of the resin film which comprises a packaging bag. It is the schematic for demonstrating the manufacturing method of a package. It is a perspective view which shows the state after shrinkage | contraction of a packaging bag.

  Hereinafter, embodiments of a packaging bag to which the present invention is applied will be described in detail with reference to the drawings.

  The packaging bag 1 of this embodiment is manufactured with a pillow packaging machine using a multilayer film, for example, and as shown in FIG. 1, along the film end surface in the overlapping portion 2 where the multilayer films are overlapped. This is a packaging bag in which a longitudinal seal portion 3 is formed by sealing in the longitudinal direction, and both end openings are sealed in a direction orthogonal to the longitudinal seal portion 3 to form lateral seal portions 4 and 5.

  In order to form the packaging bag 1, as shown in FIG. 2, the multilayer film 10 is curved into a cylindrical shape, and the overlapping portion 2 is formed by overlapping both ends thereof, and the outer surface of the overlapping portion 2 is formed. Vertical sealing is performed with a band-shaped non-seal part (functioning as a finger holder) with a width (10 to 20 mm) that can be picked by a finger on the tip side of one side edge that is on the side. The seal part 3 is formed.

  At this time, in the packaging bag 1 of the present embodiment, the lower end portion 10a of the multilayer film 10 is folded back to correspond to the overlapped portion 2, and the inner layer 11 of the multilayer film 10 is outside in this portion. Keep facing. Here, the other end portion 10b of the multilayer film 10 is overlapped in the same manner as in the case of envelope attachment, and the vertical sealing is performed. Therefore, in the vertical seal portion 3, the inner layers 11 in the multilayer film 10 are joined together.

  The vertical seal portion 3 can be formed in the same state as the sealing step in the envelope pasting method in the joined state. The formed vertical seal portion 3 is formed by a plurality of (in this case, two) thin lines. However, the present invention is not limited to this, and for example, a single relatively wide seal portion may be used. . Alternatively, three or more patterns can be used.

  Then, a predetermined amount of contents (filled material) is filled in the cylindrical body subjected to the vertical seal, and the horizontal seals 4 and 5 are formed so as to intersect the vertical seal 3 and sealed. Here, none of the vertical seal portion 3 and the horizontal seal portions 4 and 5 are peeled off before opening to take out the filling material from the packaging bag 1, and when opening, the strip-shaped non-stick It is preferable that the finger-insertion portion, which is a seal portion, is easily peeled off simply by picking it with a finger and pulling it. In order to realize this, the vertical seal portion 3 and the horizontal seal portions 4 and 5 may be formed as a cohesive peel easy-open seal (so-called easy peel).

  In the case of the packaging bag 1 of the present embodiment, the lateral seal portions 4 and 5 are not only joined between the inner layers 11, but also the inner seals 11 are joined at the longitudinal seal portion 3 by the folding. Therefore, if the inner layer 11 of the multilayer film 10 is an easy peel layer, both the vertical seal portion 3 and the horizontal seal portions 4 and 5 become cohesive peel easily openable seals.

  The cohesive peel easy-open seal is such that the seal layer itself is broken and peeled off, and no stringing occurs during peeling. Therefore, there is no possibility of mixing in the filling material. In addition, the seal strength is stable with a smooth peeling feeling, and the temperature dependency is very small. Furthermore, a pure white peeling mark is generated on the peeling surface. Since this white peeling trace can be visually confirmed by peeling whether or not the seal is properly formed, it can also be used for checking the sealing state in the packaging process. As a result, the reliability of the filling object is maintained.

  In addition, when making the said vertical seal part 3 and the horizontal seal parts 4 and 5 into easy peel property, all of these seal parts (the vertical seal part 3 and the horizontal seal parts 4 and 5) have a heat seal strength of 10N according to JIS K6854. It is preferable that the width is less than / 15 mm.

  FIG. 2 is a view showing a laminated configuration of the multilayer film 10 used in the packaging bag 1. A multilayer film 10 shown in FIG. 2 includes an inner layer 11, an intermediate layer 12, and an outer layer 13.

  In the case of this embodiment, the inner layer 11 is made of a thermoplastic resin that can impart an easy peel due to cohesive failure. Examples of such thermoplastic resins include linear low density polyethylene (LLDPE) and polypropylene (PP) compositions, LLDPE and polybutene compositions, low density polyethylene (LDPE) and PP compositions, and ethylene-vinyl acetate. There are two or more kinds of mixed resins such as a composition of polymer (EVA) and PP. Of course, the resin material is not limited to these, and any resin material can be used as long as it can impart easy peel properties. It can be appropriately selected and used.

  The intermediate layer 12 is a layer provided between the inner layer 11 and the outer layer 13, and an arbitrary resin material is used in consideration of mechanical properties, barrier properties, etc. In order to satisfy various mechanical properties such as strength, polyamide is used. Is preferably used. Examples of the polyamide include aliphatic nylon such as nylon 6, nylon 66, nylon 12, and nylon 46, aliphatic nylon containing aromatics, aromatic nylon and the like, or copolymerized nylons thereof, and a mixture of these resins. .

  For the outer layer 13, any resin material can be used, for example, a polyolefin resin can be used. Examples of the polyolefin resin include various polyethylenes and polypropylenes.

  The multilayer film 10 is preferably a so-called laminate film. The laminate film is manufactured by laminating a pre-processed film. For example, a biaxially stretched film such as a biaxially stretched polyamide film can be used for the intermediate layer 12 serving as a base material. For example, if a biaxially stretched film can be used, the film strength can be greatly improved, and the manufactured packaging bag 1 can be thermally shrunk.

  When the multilayer film 10 is a laminated film, the adhesive layer between the intermediate layer 12, the inner layer 11, and the outer layer 13 differs depending on the method of bonding. For example, it is preferable in that these can be bonded together by a dry lamination method to increase the adhesive strength and to improve the tearability when the bag is opened. In that case, for example, a two-component curable polyurethane adhesive for dry lamination can be used as the adhesive layer.

  Further, the intermediate layer 12, the inner layer 11, and the outer layer 13 can be bonded together by an extrusion laminating method. In that case, a polyolefin-based heat-adhesive resin such as low-density polyethylene can be used as the adhesive layer. it can. In addition, a simple substance such as an ethylene-methacrylic acid copolymer, an ethylene-acrylic acid copolymer, or an ionomer, or a resin blended with an adhesion improver such as a hard resin can be used.

  In the vertical seal portion 3 of the produced packaging bag 1, the folded end portion 10 a of the multilayer film 10 is in contact with the outer surface of the packaging bag 1. At this time, the end portion 10a may be fused to the outer surface or may not be fused. In the case of fusion, the outer layers 13 of the multilayer film 10 are fused to each other, and a strong adhesion state is obtained in which the fusion strength is higher than that of the easy peel.

  The packaging bag 1 of this invention can perform a sealing process easily similarly to an envelope sticking system. FIG. 3 shows an example of the manufacturing process of the packaging bag 1 of the present invention.

  FIG. 3 is a schematic diagram for explaining a method of manufacturing the package 1 according to the present embodiment using a pillow packaging machine. As shown in FIG. 3, the pillow packaging machine 20 includes a hopper 21 into which contents are charged, a tubular film 27 that communicates with the inside of the hopper 21, and a former 22 provided on the tubular film 27. A vertical sealing machine 23 provided below the former 22 and provided with a vertical sealing portion, a squeezing roll 25 for squeezing the cylindrical film 27 and putting the contents into the cylindrical film 27, and the cylindrical film 27 And a horizontal sealing machine 26 provided with a horizontal sealing portion 36.

  In the manufacturing method of the package 1, the film 31 is conveyed from the roll-shaped raw fabric R around which the long film 31 is wound, and the film 31 is curved by the former 22 to be cylindrical. In this process, the end portion on the inner side of the film 31 is folded in advance. At the time of folding, it is preferable that the crease is sufficiently attached by a press or the like. Further, at the time of this folding, the overlapping portion may be strongly bonded to the outer surface of the film 31 by fusing the outer layers.

  Then, a vertical seal unit 23 is provided at a vertical end portion where the cylindrical film 31 overlaps to form a cylindrical film 27.

  Next, the cylindrical film 27 is fed downward and the ironing roll 25 is closed, so that the cylindrical film 27 is squeezed and a horizontal sealing unit 26 is provided on the cylindrical film 27 with a horizontal sealing machine 26. And the content thrown in from the upper hopper 21 is distribute | circulated inside the cylindrical film 27, is discharged from the lower part of the cylindrical film 27, is thrown in in the cylindrical film 27, and is filled.

  Then, the ironing roll 25 is opened, and the cylindrical film 27 is sent downward. Then, by closing the ironing roll 25 again, the cylindrical film 27 is ironed, and a horizontal sealing portion is provided on the cylindrical film 27 by the horizontal sealing machine 26. Moreover, the package 1 which provided the horizontal seal part in the front and back both horizontal end parts, respectively, and was sealed by cut | disconnecting between the provided horizontal seal parts with the cutter 28 is obtained. By repeating these operations, the packages 1 continuously filled with the contents are sequentially obtained.

  The package 1 obtained as described above has an irregular shape with irregular irregularities as it is, but a laminate film using a biaxially stretched polyamide film or the like is used for the intermediate layer 12 as a base material. By producing the packaging bag 1, the packaging form can be improved by shrinkage.

  When performing thermal shrinkage, for example, a package filled with a viscous material is transferred to a dipping device by a conveyor belt, and is accommodated in a retainer attached to an endless conveyor. The package accommodated in the retainer is continuously immersed in warm water (40 ° C. to 98 ° C.) in the bathtub, the laminated film of the immersed package is contracted, and the viscous material is compressed. As a result, the package having an irregular shape is reduced in flatness and becomes a package having a circular shape that is smooth in the cross section of the central portion. Next, the package taken out from the bathtub is transported by a shooter, dried and boxed. FIG. 4 shows the package 1 after the shrinkage compression process. The irregular uneven appearance shape is smooth and curved by immersing in warm water to shrink the laminated film and compressing the stored viscous material. It is configured in the appearance shape.

  As described above, according to the packaging bag of the present invention, sealing is performed in the form in which the inner layers 11 are in contact with each other even in the vertical seal portion 3, and easy peel properties are imparted. Moreover, in the vertical seal part 3, since the edge part 10a of the multilayer film 10 does not enter inside, additives, such as a chip and a pigment, do not transfer to the content from the edge surface of the multilayer film 10. Moreover, the packaging bag of this invention becomes a seal form similar to an envelope sticking system, and an appearance also becomes a thing close | similar to an envelope sticking system.

  As mentioned above, although the embodiment of the packaging bag to which the present invention is applied has been described, it is needless to say that the present invention is not limited to the above-described embodiment, and the size, shape, and material are within the scope of the present invention. It is possible to make appropriate changes.

DESCRIPTION OF SYMBOLS 1 Packing bag 2 Overlapping part 3 Vertical seal part 4,5 Horizontal seal part 10 Multilayer film 10a One edge part (folding part)
10b The other end 11 Inner layer 13 Outer layer

Claims (5)

An envelope-pasting packaging bag having easy peel properties,
A packaging bag, wherein one end of a resin film to be overlaid is sealed in a folded state in advance.   The packaging bag according to claim 1, wherein the overlapping portion is fused to the outer surface of the packaging bag.   The packaging bag according to claim 2, wherein the resin constituting the outer surface of the resin film has higher fusion strength than the easy peel layer.   The packaging bag according to any one of claims 1 to 3, wherein the packaging bag is heat-shrinked. A method for manufacturing an envelope-pasting packaging bag having easy peel properties,
A method for producing a packaging bag, comprising: sealing one end of a resin film to be overlapped, and then sealing.

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