JP2013199280A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag having a function of closing an opening with a simple structure.SOLUTION: A packaging bag is provided with a seal part, wherein sealant layers of front and rear laminates having at least base material layers and the sealant layers are disposed opposite each other and welded. A label material obtained by attaching or laminating a shape retaining wire material is provided on either of outer surfaces of the front and rear laminates, at a substantially central part of a take-out opening port emerging by cutting a seal side at one side thereof, wherein a/b is ≥5, where a N is a shape retaining force of the shape retaining wire material and b N is stiffness of the laminate.

Description

  The present invention relates to a packaging bag. More specifically, the present invention relates to a packaging bag having a function of closing and resealing the opening after opening.

  In recent years, various types of containers have been used as containers for storing contents such as snacks. Typical examples are soft packaging bags of various shapes, and paper containers with cylindrical or prismatic outer shapes. and so on.

  In the case of paper containers, the contents can be re-sealed with a lid etc. relatively easily after taking out the contents. However, in the case of soft packaging bags, it is difficult to reseal after taking out, and It is resealed with a separately prepared jig across the opening.

  Also, plastic chucks with male and female molds were welded to the front film and back film below the take-out opening to form a packaging bag with a chuck. After opening, the chuck was closed and resealed. There is something.

  On the other hand, a material that can be repeatedly bent and stretched, or a material that can be wound or twisted, is taken out and assembled in any of the vertical, parallel, and diagonal directions with respect to the opening, closed, and resealed. A bag that enables this is proposed (Patent Document 1).

Utility Model Registration No. 3047802

  However, in the case of a packaging bag with a chuck, when the contents such as powder are taken out, the powder of the contents may adhere to the chuck portion, and the chuck may not be closed and re-sealed. Moreover, in the bag proposed by patent document 1, although the wire is illustrated as a material, there exists a possibility that closing property may not fully be acquired according to the waist and conditions of a packaging material.

  The present invention has been made in view of the circumstances described above, and an object thereof is to provide a packaging bag having a simple structure and having a closing function.

The invention according to claim 1 of the present invention is a packaging bag in which a front and back materials of a laminate having at least a base material layer and a sealant layer are welded so that the sealant layers are opposed to each other, and a seal portion is provided. A label material attached or laminated with a shape retaining wire is provided on the outer surface of either of the front and back laminates at a substantially central portion of the take-out opening that appears by cutting off the seal side of the shape, and the shape retaining force of the shape retaining wire is aN. And, when the waist strength of the laminate is bN, a / b is 5 or more.
The invention according to claim 2 is made of a plastic sheet that imparts shape retention performance by stretching the shape-preserving wire at different stretching ratios in length and width, and the stretching direction of the high stretching ratio is the opening of the opening. The packaging bag according to claim 1, wherein the packaging bag is arranged in a direction substantially perpendicular to the cutting direction.

When the packaging bag of the present invention is folded below the take-out opening, the shape-preserving wire is provided at the substantially central portion, so that the fold can be closed without returning. Unlike the packaging bag with a chuck, it is not necessary to attach a chuck having a male mold and a chuck having a female mold to the front film and the back film, respectively, and a closing function can be obtained with a simple structure and a simple operation. Further, when the content is powder, the groove is clogged in the chuck and the fitting is deteriorated and the closing function is deteriorated, but the closing function is not deteriorated in the packaging bag of the present invention.
Furthermore, since the label attachment part of the shape-retaining wire is the substantially central part of the packaging bag that does not overlap the seal part, it can be easily attached by a labeler in the bag making process or in the subsequent process without affecting the bag making conditions. .
As a method of attaching to the outer surface of the laminate, there are methods such as labeling the shape-retaining material itself by subjecting it to adhesion, or fixing the shape-retaining wire to the outer surface of the laminate with a separate label material. Furthermore, by using a plastic material as the shape-retaining material, it is possible to dispense with separation even when discarded.

It is the schematic which showed the 1st Embodiment of the packaging bag of this invention typically on the front. It is the schematic which showed 2nd Embodiment of the packaging bag of this invention typically on the front. It is the schematic which showed an example of the laminated body used for the packaging bag of this invention typically in the cross section. It is explanatory drawing explaining the method to measure the shape retention force of the shape retention plastic material used for the packaging bag of this invention.

Hereinafter, modes for carrying out the present invention will be described.
FIG. 1 is a schematic view schematically showing the first embodiment of the packaging bag of the present invention on the front side.
FIG. 2 is a schematic view schematically showing the second embodiment of the packaging bag of the present invention on the front side.

  The packaging bag 100 of 1st Embodiment is a four-sided seal bag which showed the typical front view in FIG. The packaging bag 100 is welded with the top seal portion 1, the ground seal portion 2, the left side seal portion 3 and the right side seal portion 4 so that the sealant layers of the laminate are opposed to each other, and a seal portion is provided around the laminate. Yes.

  In the packaging bag 100, V-notches 6 and 7 are provided on the side seal portions on both sides of the take-out opening portion planned portion 5, and the V-notches 6 and 7 are torn in the horizontal direction in the drawing to take out. The planned opening portion 5 is opened.

  And the shape maintenance wire 8 is attached to the laminated body of the approximate center part of the taking-out opening part 5. The shape-retaining wire 8 is labeled by laminating an adhesive layer on one side, and is fixed by bonding the adhesive side to the outer surface of the laminate film. The shape-retaining wire 8 is attached so that the longitudinal direction, which is a high draw ratio direction that exhibits shape-retaining properties, is substantially perpendicular to the cutting direction of the opening (left-right direction in the figure) (up-down direction in the figure). Yes.

  The shape holding wire 8 is attached so that the upper end is located near the lower portion of the extraction opening portion 5 and is directed toward the ground seal portion. The lower end may be at a position necessary for folding the upper portion of the packaging bag and closing it.

  Moreover, the packaging bag 200 of 2nd Embodiment is a standing pouch which showed the typical front view in FIG. If it is a packaging bag which has a front and back laminated body, the shape of the packaging bag of this invention will not be restricted to this.

The packaging bag 200 is substantially the same as the packaging bag 100, but the bottom seal portion 2 has a bottom tape folded back in an inverted V shape and inserted between the front film and the back film to form a bottom seal. ing.

  Since the ground seal part 2 is a ship bottom type seal, the lower end of the attachment position of the shape retaining wire 8 is located above the ship bottom type seal of the ground seal part 2. The shape-retaining wire 8 is fixed to the laminate film by the adhesive label 9. As the pressure-sensitive adhesive label 9, a stretched base material such as OPP or PET is preferably used in view of processability, and if necessary, an ink layer, an aluminum vapor deposition layer, or the like may be laminated, and the back surface is subjected to pressure-sensitive adhesive processing.

  FIG. 3 is a schematic view schematically showing an example of a laminate 10 used in the packaging bag of the present invention in cross section. The laminate used for the packaging bag of the present invention is a laminate in which at least the base material layer 11 and the sealant layer 12 are laminated. Further, an intermediate layer 13 may be provided between the base material layer 11 and the sealant layer 12.

  3 is described so that the upper side of the figure is the front side of the packaging bag, and the base material layer 11, the adhesive layer 14, the intermediate layer 13, the adhesive layer 15, and the sealant layer 12 are laminated. It becomes the composition.

  Examples of the base material layer 11 include polyester films such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polyamide films such as nylon-6 and nylon-66, polycarbonate films, polyacrylonitrile films, polyimide films, and polyvinyl alcohol. A stretched film made of any material such as a film, a polyvinylidene chloride film, an ethylene-vinyl alcohol copolymer film, a polypropylene film, a moisture-proof cellophane, or a polyethylene film is preferably used. These base material layers may be laminated with aluminum vapor deposition, inorganic oxide vapor deposition, or vinylidene chloride film for the purpose of improving barrier properties. Moreover, the thickness of the base material layer 11 is preferably 10 μm to 50 μm in consideration of workability.

  The intermediate layer 13 is mainly provided for imparting gas barrier properties or improving various mechanical strengths of the laminate 10, and the constituent material is not particularly limited, but is composed of a single layer or a multilayer film. . Non-stretched nylon film, aluminum foil, ethylene / vinyl alcohol copolymer film, polyvinylidene chloride film, acrylonitrile film, vinylidene chloride resin coated cellophane, etc. are used as the single layer film. A laminated film, an aluminum-deposited polyester film, an aluminum-deposited polypropylene film, an inorganic oxide-deposited polyester film, or the like is used. As a method for laminating the intermediate layer 13, a known method such as a dry lamination method can be used.

  The sealant layer 12 is made of a polyolefin resin, and examples of the resin include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene- α-olefin copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ionomer A resin such as a resin or an ethylene-vinyl acetate copolymer can be laminated by an extrusion laminating method, or a film obtained by forming a film of these resins can be laminated through an adhesive.

  As the sealant layer 12, linear low density polyethylene is often used in consideration of sealability. As the linear low density polyethylene, a linear low density polyethylene having an α-olefin having 4 carbon atoms in the side chain is usually used.

  Since the flexibility differs depending on the number of carbon atoms of the α-olefin, linear low density polyethylene is more flexible in the case of carbon number 6 (C6) and carbon number 8 (C8) than carbon number 4 (hereinafter C4). In order to improve the drop strength, which is a particularly problematic property in the packaging of goods, the center is mainly on linear low density polyethylene having C6 or C8 α-olefin in the side chain, and the C4 α-olefin is on the side. A multi-layer sealant layer 12 provided with linear low density polyethylene having a chain on both sides may be used.

A polyurethane-based adhesive can be used for the adhesive layer 14 and the adhesive layer 15. Usually, a two-component curing type is used in which a main component having a hydroxyl group and a curing agent having an isocyanate group are mixed in two components. As the lamination method, a known method such as a gravure coating method can be used. The coating amount is preferably used in the range of usually ^1g / ^{m 2 ~5g} / m 2 in a dry state.

  Although not shown, a printing ink layer is provided as necessary. The printing ink layer is often provided on the back surface of the normally transparent base material layer 11 from the viewpoint of maintaining friction resistance, but may be provided on the surface. Further, mat varnish or the like may be provided on the surface as an ink layer by a printing method.

  As a method of providing the printing ink layer on the base material layer 11, it can be provided by an ink corresponding to the material of the base material layer 11 by a known printing method such as gravure printing or flexographic printing. In some cases, the surface of the base material layer 11 may be subjected to treatment such as corona discharge treatment, plasma treatment or anchor coating in order to improve the wettability and adhesion of the ink.

  As described above, the packaging bag of the present invention is composed of the laminate 10 having the base material layer 11, the sealant layer 12 and the intermediate layer 13 as necessary, and the sealant layers 12 are welded to face each other to provide a seal portion. The shape-preserving wire 8 is labeled on the outer surface of the laminate at the substantially central portion of the opening planned portion 5 in the direction of the ground seal 2, and the wire itself is labeled or fixed with another adhesive label 9. Packaging bag.

  Then, when the shape holding force of the shape holding wire 8 is aN and the waist strength of the laminate 10 is bN, a / b is 5 or more.

  The waist strength b of the laminate used in the packaging bag of the present invention is measured using a roof stiffness tester (manufactured by Toyo Seiki Seisakusho) as a measuring device. The laminate 10 is cut into a width of 15 mm and a length of 165 mm to obtain a measurement sample.

  The sample is set on the measuring device so as to form a loop with a circumference of 100 mm, the measurement is started, the loop is crushed in the diameter direction, and the load applied to the sample when the interval is reduced to 15 mm is Measured as waist strength bN.

  Some examples of the structure of the laminate corresponding to the waist strength that can be used in the present invention are as follows: waist strength 0.01N is a laminate film of polyethylene terephthalate film 12 μm and polyethylene film 40 μm, waist strength 0.03N is stretched Laminate film of polypropylene film 20 μm and evaporated unstretched polypropylene film 30 μm, waist strength 0.05 N is a polyethylene terephthalate film 12 μm, aluminum foil 9 μm, polyethylene film 40 μm laminate film, waist strength 0.1 N is nylon film 15 μm and polyethylene film 90 μm A laminate film having a waist strength of 0.2 N includes a laminate of a polyethylene terephthalate film 12 μm, a nylon film 15 μm, and a polyethylene film 90 μm.

As the shape maintaining wire 8 used in the packaging bag of the present invention, one having a property capable of holding the bent shape when bent is used. As the material, a plastic material is preferable in consideration of easy disposal in the state attached to the packaging bag body, and a stretched polyethylene film that can easily exhibit shape retention performance by stretching is particularly easy to use. As an example, Sekisui Mold Co., Ltd. product name Forte is mentioned. This product name forte is supplied in sheet or line form, and has the property of exhibiting shape retention performance when bent in a direction perpendicular to the stretching direction by processing at a high stretch ratio in one direction. doing.

  The shape holding force a of the shape holding wire 8 can be measured by the method shown in FIG. A shape-retaining plastic material having a length of 100 mm is prepared as a measurement sample, and a sample having a 30 mm length bent once at 180 degrees is stretched at a constant speed of 300 mm / min in the direction indicated by the white arrow in FIG. The maximum load aN that is sometimes generated is defined as the shape retention force.

  In the case of the product name Forte, some examples of the dimensions of the shape-retaining plastic material corresponding to the shape-retaining force that can be used in the present invention are shown in the case of the product name Forte. The holding force 0.5N is 0.6 mm thick and 5 mm wide, the shape holding force 0.5N is 0.4 mm thick and 10 mm wide, and the shape holding force 1.2N is 0.6 mm thick and 10 mm wide.

  Specific examples of the present invention will be described below.

<Example 1>
A polyethylene terephthalate film of 12 μm was prepared as the base material layer 11 and a polyethylene film of 40 μm was prepared as the sealant layer 12 and laminated by a dry laminating method. The sealant layers 12 of this laminate are opposed to each other, and a product name forte as a shape-preserving wire is attached as a strip-shaped label material having a thickness of 0.6 mm, a width of 10 mm, and a length of 30 mm at the center of the opening planned portion on the outer surface of the laminate. A packaging bag of Example 1 having a side seal of 10 mm and seal portions on the upper and lower sides of the laminate and having a width of 120 mm and a length of 180 mm was produced.

<Example 2>
A stretched polypropylene film of 20 μm was prepared as the base material layer 11 and an unstretched polyethylene film of 30 μm was prepared as the sealant layer 12 and laminated by a dry laminating method. The laminate sealant layers 12 are made to face each other, and the product name forte as a shape-preserving wire at the center of the opening of the laminated film outer surface in the form of a strip having a thickness of 0.4 mm, a width of 5 mm, and a length of 25 mm is obtained. The packaging bag of Example 2 having a width of 200 mm and a length of 280 mm is fixed by an adhesive label of an OPP 50 μm base material having a length of 50 mm, a side seal is provided with a width of 18 mm, a seal portion is provided around the laminate. Created.

<Example 3>
A polyethylene terephthalate film of 12 μm was prepared as the base material layer 11, a nylon film of 15 μm was prepared as the intermediate layer 13, and a polyethylene film of 90 μm was prepared as the sealant layer 12, which were laminated by the dry laminating method. Attach a label material in the form of a strip having a thickness of 0.6 mm, a width of 10 mm, and a length of 30 mm as a shape-retaining wire at the center of the opening of the laminated body facing the sealant layers 12 of the laminate, A side seal was provided with a width of 10 mm, a seal part was provided around the laminated body, and a packaging bag of Example 3 having a width of 150 mm and a length of 180 mm was produced.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
A polyethylene terephthalate film 12 μm was prepared as the base material layer 11, an aluminum foil 9 μm was prepared as the intermediate layer 13, and a polyethylene film 40 μm was prepared as the sealant layer 12, which were laminated by the dry laminating method. Attach a label material in the form of a strip with a thickness of 0.4 mm, a width of 5 mm, and a length of 30 mm as a shape-retaining wire at the center of the opening planned portion on the outer surface of the laminate, with the sealant layers 12 of the laminate facing each other. A side seal was provided with a width of 10 mm, a seal portion was provided around the laminate, and a packaging bag of Comparative Example 1 having a size of 150 mm and a length of 180 mm was prepared.

<Comparative example 2>
A polyethylene terephthalate film of 12 μm was prepared as the base material layer 11, a nylon film of 15 μm was prepared as the intermediate layer 13, and a polyethylene film of 90 μm was prepared as the sealant layer 12, which were laminated by the dry laminating method. Attach a label material in the form of a strip with a thickness of 0.4 mm, a width of 5 mm, and a length of 30 mm as a shape-retaining wire at the center of the opening planned portion on the outer surface of the laminate, with the sealant layers 12 of the laminate facing each other. A side seal was provided with a width of 10 mm, a seal portion was provided around the laminate, and a packaging bag of Comparative Example 2 having a size of 120 mm and a length of 180 mm was prepared.

<Test method>
The packaging bags prepared in Examples 1, 2, and 3 and Comparative Examples 1 and 2 were tested by the following method to compare and evaluate the closing performance.

<Evaluation of mouth closure>
The packaging bags of Examples 1, 2, and 3 and Comparative Examples 1 and 2 are each opened, the position 15 mm below the opening is parallel to the opening, and the attached surface of the shape-retaining wire is folded back 180 ° to the mountain side and opened. The part was closed. Let stand for 3 minutes and measure the angle between the bottom and top of the fold. The measured angle is less than 50 °, and 50 ° or more is x. The results are summarized in Table 1.

In addition, the shape retention force a of the used shape retention plastic material and the waist strength b of the laminate were obtained in advance by the above-described methods.

  Below, the comparison result of an Example and a comparative example is demonstrated.

<Comparison result>
The packaging bags of Examples 1, 2, and 3 did not return folds and had good closing properties. On the other hand, the packaging bags of Comparative Examples 1 and 2 had a / b values of 4 and 1, respectively, had poor closing properties, and could not be closed properly.

DESCRIPTION OF SYMBOLS 100 ... Packaging bag 200 ... Packaging bag 1 ... Top seal part 2 ... Ground seal part 3 ... Left side seal part 4 ... Right side seal part 5 ... Extraction opening plan Part 6 ... V notch 7 ... V notch 8 ... Shape retaining wire 9 ... Label material (adhesive label)
DESCRIPTION OF SYMBOLS 10 ... Laminated body 11 ... Base material layer 12 ... Sealant layer 13 ... Intermediate layer 14 ... Adhesive layer 15 ... Adhesive layer

Claims (2)

  A packaging bag in which a seal portion is provided by facing the sealant layers of a front and back laminate having at least a base material layer and a sealant layer, and a seal portion is provided, which is formed by cutting off the seal side of one side, and substantially at the center of the take-out opening In addition, a label material attached or laminated with a shape-retaining wire is provided on either outer surface of the front and back laminates, the shape-retaining power of the shape-retaining wire is aN, and the waist strength of the laminate is bN. A packaging bag, wherein / b is 5 or more.   The shape-retaining wire is made of a plastic sheet imparting shape-retaining performance by stretching at different stretching ratios in length and breadth, and the stretching direction of the high stretching ratio is arranged in a direction substantially perpendicular to the cutting direction of the opening. The packaging bag according to claim 1, wherein the packaging bag is formed.

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