JP2008201422A - Easy-to-open barrier packaging bag and laminate film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminate film for a barrier bag which is improved so as to be easy to open. <P>SOLUTION: The laminate film 1 includes a barrier film 2, a thermoplastic resin film 4 which overlies one side of the barrier film 2 and is provided with a perforation 5 by a machine blade, and a polyolefin film 6 overlying the other side of the barrier film 2. The laminate film 1 is formed in a bag with the thermoplastic resin film on the face side so that the perforation 5 appears at an unsealing scheduled position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a barrier packaging bag that is improved so as to be easily opened. The present invention also relates to a laminate film for a barrier packaging bag for producing such a barrier packaging bag.

As a barrier packaging bag, Patent Document 1 proposes a packaging bag formed by engraving an opening cut. That is, a two-component curable urethane-based adhesive is coated on one side of a biaxially stretched nylon film, and then an aluminum foil is dry-laminated on the adhesive surface, and further on the other side of the aluminum foil. A two-component curable urethane adhesive is coated, and a low-density polyethylene film is dry laminated on the adhesive surface to produce a three-layer laminate. Next, a standing pouch (self-supporting bag) is manufactured from the laminate, and then the carbon dioxide gas level is formed on the front and back surfaces of the standing pouch (self-supporting bag) at locations corresponding to the optimum opening position. Using the zipper, cut the opening for opening the continuous line. Thus, an easily openable barrier packaging bag is obtained.
JP-A-10-17013

  However, in the technique disclosed in Patent Document 1, since the perforation is made using a carbon dioxide laser, there is a problem that the perforation is not engraved unless the material absorbs the carbon dioxide laser. . Therefore, in Patent Document 1, a polyamide film is used.

  Further, the disclosed technique of Patent Document 1 has a problem that a large facility such as a carbon dioxide laser irradiator is required because the carbon dioxide laser is used to perforate. Moreover, since the material is also limited, there is a problem that it may not be preferable as a general food barrier bag.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an easy-open barrier packaging bag that can be manufactured without using a large-scale apparatus.

  Another object of the present invention is to provide a barrier packaging bag having an easy-open property that can be produced without limiting the material.

  Still another object of the present invention is to provide a laminate film that provides a barrier packaging bag with easy opening that can be produced without limiting such materials.

  The present invention relates to a barrier packaging bag in which a laminated film is formed. The laminate film includes a barrier film, a thermoplastic resin film having a perforation provided by a perforation blade, laminated on one surface of the barrier film, and a polyolefin film laminated on the other surface of the barrier film. including. The laminate film is formed by making a bag so that the perforation appears at a planned opening position and with the thermoplastic resin film as a front side.

  In this invention, the ratio (m1 / m2) of the length of the perforated cut portion (m1) and the non-cut portion (m2) is 1 or more and 5 or less, and the perforated non-cut portion (m2) The length is 0.5 mm or more and 5 mm or less.

  In this invention, the thermoplastic resin film has a thickness of 8-30 μm, the barrier film has a thickness of 5-20 μm, and the polyolefin film has a thickness of 12-70 μm.

  In this invention, the thermoplastic resin film is a biaxially stretched polyethylene terephthalate film or a biaxially stretched polypropylene film, the barrier film is formed of an aluminum foil, an aluminum deposited film or a transparent deposited film, and the polyolefin film is It is formed of low density polyethylene or polypropylene.

  Further, in the present invention, the barrier packaging bag is a pillow bag or a gusset bag, and the perforation appears in at least one of both sides of the back pasting portion of the pillow bag, and the gusset In the case of a bag, it is characterized by appearing in at least one of both sides of the back pasting portion of the gusset bag or in the vicinity of the side folding portion of the gusset bag.

  In the present invention, the thermoplastic resin film is characterized in that low-density polyethylene is interposed as an adhesive layer on one surface of the barrier film.

  A laminate film for a barrier packaging bag according to another aspect of the present invention includes a barrier film, a thermoplastic resin film provided with a perforation by a perforation blade, laminated on one surface of the barrier film, and the barrier film. And a polyolefin film laminated on the other surface.

  According to the barrier packaging bag according to the present invention, the thermoplastic resin film is used as an outer layer, and further, a perforation is made by a perforation blade, and a non-cut portion between the cut portion of the perforation and the next cut portion is provided. Can be torn with a slight force. As a result, the consumer can easily open the bag at the perforated portion, and can easily take out the contents from the bag.

  FIG. 1 is a cross-sectional view of a laminate film used in a barrier packaging bag according to the present invention, and FIG. 2 is a plan view. 1 is a cross-sectional view taken along line II in FIG.

  With reference to these drawings, a laminate film 1 according to the present invention includes a barrier film 2. A thermoplastic resin film 4 having a perforation 5 provided by a perforating blade is laminated on one surface of the barrier film 2 with a low-density polyethylene film 3 interposed as an adhesive layer. A polyolefin film 6 is laminated on the other surface of the barrier film 2.

  As will be described later, the laminate film 1 is formed into a bag so that the perforation 5 appears at the planned opening position and the thermoplastic resin film 4 is the front side, and is finished into a barrier packaging bag.

  For the barrier film 2 of the present invention, for example, a material having a light-shielding property that blocks light such as sunlight or a barrier property that does not transmit gas such as water vapor, water, and oxygen can be used. Specifically, for example, an aluminum foil having a light shielding property and a barrier property (hereinafter referred to as an aluminum foil) or an aluminum vapor deposition film can be exemplified, and further, silicon oxide or oxide having a barrier property although having no light shielding property. A transparent vapor deposition film of an inorganic oxide such as aluminum can also be exemplified.

  The film thickness of the barrier film 2 is 5 to 20 μm, preferably 5 to 15 μm. When the film thickness of the barrier film 2 is within this range, it is preferable that the contents of the bag are suitably protected and the opening of the bag from the perforation is not impaired.

  As the thermoplastic resin film 4, a biaxially stretched polyethylene terephthalate film or a biaxially stretched polypropylene film is preferable. The impact strength (J) of these films is, for example, 0.4 J for a 12 μm biaxially stretched polyethylene terephthalate film and 0.6 J for a 25 μm biaxially stretched polypropylene film. If the impact strength is 1.0 J or less, it can be easily broken by applying pressure to the perforated portion of the barrier packaging bag with a finger or the like. Further, it is preferable that the impact strength is 0.1 J or more because it is not broken by an impact when transporting the barrier packaging bag.

  The impact strength here is measured using a film impact tester manufactured by Toyo Seiki Seisakusho and using an impact portion made of brass having a diameter of 1/2.

  The thickness of the thermoplastic resin film 4 is preferably 8 to 25 μm in the case of a biaxially stretched polyethylene terephthalate film, and preferably 10 to 30 μm in the case of a biaxially stretched polypropylene film. If it is this range, the said impact strength can be 1.0J or less, and it is preferable.

  Examples of the biaxially stretched polyethylene terephthalate film include E5100 manufactured by Toyobo Co., Ltd. Examples of the biaxially stretched polypropylene film include PA20 manufactured by Santox Co., Ltd. and Pyrene P2161 manufactured by Toyobo Co., Ltd.

  With reference to FIG.1 and FIG.2, the perforation 5 given to the thermoplastic resin film 4 is provided with the perforation blade. According to a preferred embodiment of the present invention, the ratio (m1 / m2) of the length of the cut part (m1) to the non-cut part (m2) of the perforation 5 is 1 or more and 5 or less, and the cut part (m1) Is longer and easier to open. The length of the non-cut portion (m2) of the perforation 5 is preferably 0.5 mm or more and 5 mm or less. Since the impact strength of the thermoplastic resin film 4 is small, if the length of the non-cut portion (m2) is less than 1 mm, it may be broken by the impact during transportation, which is not preferable. On the other hand, if it exceeds 5 mm, it may be difficult to open, which is not preferable.

  In the case of a barrier packaging bag, for example, a pillow bag, the perforation 5 is preferably provided on at least one of both sides of the back pasting portion of the pillow bag. Moreover, when a barrier packaging bag is a gusset bag, for example, it is preferable that the perforation 5 is provided in the vicinity of the side folding part of at least one of the both sides of the back pasting part of this gusset bag, or this gusset bag.

  The barrier packaging bag of the present invention has a perforation provided on the barrier packaging bag so that the perforation provided on the barrier packaging bag can be easily opened by, for example, pushing with a finger or pulling on both sides. When it is applied to at least one of both sides of the pasting part, it is preferable that it is at a position within 30 mm (the back pasting part and perforation do not overlap) on both sides with the back pasting part as the center. Moreover, when giving in the vicinity of the side fold part of a gusset bag, it is preferable that a perforation exists in the position within 30 mm on both sides centering on the trough part of a side fold. If it exists in such a position, it can open easily from a perforation by holding a barrier packaging bag in a hand, and is preferable.

  The polyolefin film 6 is not particularly limited as long as it can be heat-sealed when a thermoplastic resin film, the above-described barrier film, and a laminate film containing the polyolefin film are formed into a barrier packaging bag. It is preferably formed of polyethylene or polypropylene. The polyolefin film 6 has a thickness of 12 to 70 μm, preferably 13 to 50 μm. If the thickness of the polyolefin 6 film is within this range, sufficient sealing strength can be obtained, and it is preferable without impairing the opening from the perforation.

  Next, regarding the method for producing the laminate film, as the thermoplastic resin film, a biaxially stretched polyester film (hereinafter referred to as PET film), an aluminum foil as the barrier film, and low density polyethylene (hereinafter referred to as LDPE) as the polyolefin film. An example will be described in detail.

  First, a perforation is continuously made in the flow direction using a perforation blade (rotating blade) while unwinding a PET film wound in a roll shape. In the case of multiple picking, perforation can be made at the same time according to the number. It is important to design the perforation position in consideration of the size of the bag, the back sticking position or the folding position.

  Moreover, when printing a design etc., it can carry out simultaneously in this process, or can print before this process. Although there is no limitation in particular as a printing method, Gravure printing etc. can be illustrated. Examples of gravure inks include NEWLP spar manufactured by Toyo Ink Manufacturing Co., Ltd. and NT-Hilamic manufactured by Dainichi Seika Kogyo Co., Ltd. The perforated PET film is once wound up.

  Next, the laminating process will be described with reference to FIG. A roll (A) of PET film that has been perforated or printed is loaded into an unwinding device. Next, it is sent to the anchor coat (AC1) step, but this anchor coat step may be omitted. Of course, the adhesive strength between the PET film and the aluminum foil is stronger when there is an anchor coat.

  Thereafter, it is sent to the extrusion laminating process 1 to extrude LDPE (C), and an aluminum foil (B) is laminated on one side of the PET film via the LDPE film. Next, it is sent to the anchor coat (AC2) process, but this anchor coat process may also be omitted.

  Then, it sends to the extrusion laminating process 2 and extrudes LDPE (C) to form an LDPE film on the other surface of the aluminum foil (B) and wind it with a winder.

  As an example of a method for obtaining a laminated film having a layer structure as shown in FIG. 1, an extrusion laminating method is exemplified in the present embodiment. However, as a method for obtaining a laminated film having a layer structure as shown in FIG. It can be illustrated. In FIG. 4, the same parts as those shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will not be repeated.

  As a method for producing a barrier packaging bag from the laminate film thus obtained, a generally used bag making method can be applied. As for the pillow bag, either vertical pillow packaging or horizontal pillow packaging may be used.

Hereinafter, the present invention will be described in more detail using Examples and Comparative Examples, but the present invention is not limited to these Examples.
(Example 1)

A perforation was provided on a 12 μm PET film with a perforation blade so as to have a cut portion of 1 mm and a non-cut portion of 2 mm, and was wound up once. In addition, the perforation was provided so that it might become an opening expected position when bag making. Next, in the laminating step, the PET film is unwound, and an anchor coat layer (anchor coat agent: main agent, Mitsui Chemicals Polyurethane Co., Ltd. Takelac A-3200 (registered trademark) curing agent: Mitsui Chemicals Polyurethane Co., Ltd. Takenate A-3003 (registered trademark)) was provided, and an aluminum foil of 7 μm was laminated while extruding LDPE at an extrusion temperature of 300 ° C. to a thickness of 15 μm by an extrusion laminating method. At this time, lamination was performed so that the layer structure was in the order of PET film / anchor coat layer / LDPE / aluminum foil. Next, LDPE was extruded on the other surface of the aluminum foil of the laminate film so as to have a thickness of 15 μm at an extrusion temperature of 300 ° C., and then wound up to obtain a laminate film to be a base material of the barrier packaging bag. The line speed was 120 m / min.
(Example 2)

With reference to FIG. 5 (A), using the laminate film created in Example 1, the gusset bag 10 was made so that the perforation 5 appeared at the planned opening position and the PET film was the front side. The perforation was provided at a position of 20 mm on one side with the base of the back pasting portion 7 as the center.
(Example 3)

With reference to FIG. 5 (B), the gusset bag 10 was made using the laminate film prepared in Example 1 so that the perforation appears at the planned opening position and the PET film is the front side. The perforation 5 was provided at a position of 15 mm from the trough portion of the folding 8 on the side of the bag toward the back pasting portion 7.
Example 4

Referring to FIG. 6, using the laminate film prepared in Example 1, the pillow bag 11 was made with the perforated line 5 appearing at the planned opening position and with the PET film facing up. The perforation 5 was provided at a position of 20 mm on one side with the base of the back pasting portion 9 as the center.
(Comparative Example 1)

On a 12 μm PET film, a perforation was provided with a perforation blade so as to have a cut portion of 1 mm and a non-cut portion of 6 mm, and was wound up once. In addition, the perforation was provided so that it might become an opening expected position when bag making. Next, in the laminating process, the PET film was unwound, an anchor coat layer was provided on one surface, and 7 μm aluminum foil was laminated while extruding LDPE to a thickness of 15 μm by an extrusion laminating method. At this time, lamination was performed so that the layer structure was in the order of PET film / anchor coat layer / LDPE / aluminum foil. Next, LDPE was extruded to have a thickness of 15 μm on the other surface of the aluminum foil of the laminate film, and then wound up to obtain a laminate film to be a base material of the barrier packaging bag. Using this laminate film, a pillow bag was made. The perforation was provided at a position of 40 mm on both sides centering on the root of the back pasting part.
(Comparative Example 2)

  A laminate film was prepared in the same manner as in Example 1 except that a perforated line was provided on a 15 μm biaxially stretched nylon film by a sewing blade, and a gusset bag was made in the same manner as in Example 2.

  The barrier packaging bags of Example 2, Example 3 and Example 4 could be easily opened from the perforation by hand. It was difficult to open the barrier packaging bags of Comparative Examples 1 and 2 from the perforations.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  According to the barrier packaging bag according to the present invention, since the opening becomes easy, the consumer can easily take out the contents. It is particularly effective when used for a packaging bag for sweets such as potato chips.

It is sectional drawing of the laminate film used for the barrier packaging bag based on embodiment of this invention. It is a top view of the laminate film used for the barrier packaging bag based on the form of the Example of this invention. It is a simplification figure of the manufacturing process of the laminate film based on the form of the Example of this invention. It is sectional drawing of the laminate film used for the barrier packaging bag produced by the dry lamination method based on the form of the other Example of this invention. It is a perspective view of the gusset bag bag-made using the laminate film created in Example 1. FIG. 1 is a perspective view of a pillow bag made using the laminate film created in Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminate film 2 Aluminum foil 3 Low density polyethylene film 4 PET film 5 Perforation 6 Low density polyethylene film 7 Back pasting part 8 Lateral folding part 9 Back pasting part 10 Gazette bag 11 Pillow bag

Claims (12)

A barrier packaging bag in which a laminated film is formed,
The laminate film includes a barrier film, a thermoplastic resin film having a perforation provided by a perforation blade, laminated on one surface of the barrier film, and a polyolefin film laminated on the other surface of the barrier film. Including
A barrier packaging bag, wherein the laminate film is formed so that the perforation appears at a position to be opened and the thermoplastic resin film is a front side. The ratio (m1 / m2) of the length of the perforated cut part (m1) and the non-cut part (m2) is 1 or more and 5 or less,
The barrier packaging bag according to claim 1, wherein a length of the non-cut portion (m2) of the perforation is 0.5 mm or more and 5 mm or less. The film thickness of the thermoplastic resin film is 8-30 μm,
The thickness of the barrier film is 5-20 μm,
The barrier packaging bag according to claim 1 or 2, wherein the polyolefin film has a thickness of 12 to 70 µm.   The barrier thermoplastic packaging bag according to any one of claims 1 to 3, wherein the thermoplastic resin film is a biaxially stretched polyethylene terephthalate film or a biaxially stretched polypropylene film.   The barrier barrier bag according to any one of claims 1 to 4, wherein the barrier film is formed of an aluminum foil.   The barrier barrier bag according to claim 1, wherein the barrier film is formed of an aluminum vapor deposition film or a transparent vapor deposition film.   The barrier packaging bag according to any one of claims 1 to 6, wherein the polyolefin film is formed of low-density polyethylene or polypropylene.   The barrier packaging bag according to any one of claims 1 to 7, wherein the barrier packaging bag is a pillow bag, and the perforation appears on at least one of both sides of a back pasting portion of the pillow bag.   The barrier packaging bag according to any one of claims 1 to 7, wherein the barrier packaging bag is a gusset bag, and the perforation appears on at least one of both sides of a back pasting portion of the gusset bag.   The barrier packaging bag according to any one of claims 1 to 7, wherein the barrier packaging bag is a gusset bag, and the perforation appears in the vicinity of a side folding portion of the gusset bag.   The barrier packaging bag according to any one of claims 1 to 10, wherein the thermoplastic resin film is laminated on the one surface of the barrier film with a low-density polyethylene film interposed as an adhesive layer. A barrier film;
Laminated on one surface of the barrier film, a thermoplastic resin film provided with perforations by a perforation blade; and
A laminate film for a barrier packaging bag, comprising a polyolefin film laminated on the other surface of the barrier film.

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