JP4443901B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag that can prevent the occurrence of pinholes. More specifically, when a plurality of individually wrapped packaging bags are directly stored in a container such as a paper box and transported, vibrations during transportation and The present invention relates to a packaging bag that can prevent pinholes from being generated at the corners of the packaging bag by rubbing against the inner surface of a container such as a paper box due to impact or the like.

  Conventionally, packaging such as highly hygroscopic confectionery and food, or easily oxidized confectionery and food, etc., has excellent oxygen gas barrier properties and water vapor gas barrier properties in order to prevent deterioration in texture and flavor. In addition to being packaged individually and packaged into a container such as a paper box for sale, the texture and flavor of the packaged confectionery and food contents are maintained until they are eaten. At the same time, it gives a sense of security and luxury.

  However, since the individual packaging bags are transported in the state of being packaged in a container such as a paper box, a pinhole is generated in the individual packaging bag by rubbing against the inner surface of the container due to vibration or impact during transportation. There is a risk that the texture and flavor of things will be impaired. As a method for solving this, there is a method of increasing the total thickness of the laminate constituting the individual packaging bag to such an extent that no pinhole is generated in the individual packaging bag even if it is rubbed against the inner surface of the container due to vibration or impact during transportation. However, this method increases the cost, but the effect on the cost increase is small, and since the thickness of the individual packaging bag increases, there is a possibility that it is difficult to store the container in a paper box or the like. Another method is to use a cushioning material between the individual packaging bag and the inner surface of the container so that it does not rub against the inner surface of the container, but in this case the cost of the cushioning material and the container must be increased. This may lead to an increase in cost and a risk of excessive packaging. As another method, there is a method in which a reinforcing film is attached to a portion of a packaging bag where pinholes are generated (for example, see Patent Document 1).

The technique disclosed in Patent Document 1 is intended to prevent the occurrence of pinholes by attaching a reinforcing film such as a tack label to a portion of a packaging bag where pinholes are generated. This is necessary separately and leads to an increase in cost, and there is a sense of incongruity for bags that individually wrap contents such as confectionery and food.
Japanese Utility Model Publication No. 7-17738

  Therefore, the present invention is to provide inexpensively a packaging bag excellent in pinhole resistance in which contents such as confectionery and food are individually packaged and transported in a form packed in a container such as a paper box. .

In order to achieve the above-mentioned object, the inventor of the present invention according to claim 1 comprises a laminate having a base material layer and a heat-adhesive resin layer on the inner layer, and is sealed with a peripheral heat-bonding portion. In a seal-type or pillow-type packaging bag, a predetermined region that includes an intersection of the folded portion of the packaging bag and an inner edge side of the peripheral thermal bonding portion orthogonal to the peripheral edge and does not reach the outer edge of the peripheral thermal bonding portion A release agent layer is formed only between the base material layer and the inner layer, and the space between the base material layer and the inner layer is an unbonded portion or a weakly bonded portion, and portions other than the predetermined region are the base material layer. The inner layer and the inner layer are bonded by a sandwich lamination method or a dry lamination method, and only the non-bonded portion or the weakly bonded portion can be peeled between the base material layer and the inner layer to prevent pinholes due to rubbing. It is what. Usually, since the intersection of the edge of the wrapping bag and the inner edge of the peripheral thermal bonding portion orthogonal to the edge is a corner, this intersection is rubbed against the inner surface of a container such as a paper box. There is a possibility that pinholes may occur at the intersections, but by using the configuration of the present invention, a packaging bag having excellent pinhole resistance can be obtained, and pinholes generated at the intersections can be prevented. Can do.

Further, the present invention according to claim 2 is a pillow type package comprising a laminate having a base material layer and a heat-adhesive resin layer on the inner layer, and sealed with a peripheral heat-bonding portion having gusset folding portions at both end portions. In the bag, the base material layer is formed only in a predetermined region that includes a corner portion of the bottom surface and does not reach the outer edge of the peripheral thermal bonding portion when the bottom portion is formed in a rectangular shape to make the packaging bag self-supporting. A release agent layer is formed between the inner layer and the inner layer, and the base layer and the inner layer form an unbonded or weakly bonded portion, and the base layer and the inner layer are sandwiched between portions other than the predetermined region. It is bonded by a lamination method or a dry lamination method, and only the non-bonded portion or the weakly bonded portion can be peeled between the base material layer and the inner layer, and pinholes due to rubbing can be prevented. . Usually, when the bottom portion is formed in a rectangular shape to make the packaging bag self-supporting and the bottom surface is formed, the corner portion of the bottom surface may rub against the inner surface of a container such as a paper box and a pinhole may be generated at the corner portion. However, with the configuration of the present invention, a packaging bag having excellent pinhole resistance can be obtained, and pinholes generated at the corners can be prevented.

  Moreover, the present invention according to claim 3 is that, in the packaging bag according to any one of claims 1 and 2, the adhesive strength of the non-adhered portion or the weakly bonded portion is 0 to 0.7 N / 15 mm wide. It is a feature. By configuring in this way, the edge formed by the folded portion of the packaging bag and the intersection on the inner edge side of the peripheral thermal bonding portion orthogonal to the edge, or the bottom portion is molded into a rectangular shape to make the packaging bag self-supporting When the bottom surface is formed, even if the corner portion of the bottom surface rubs against the inner surface of the container such as a paper box, the intersection or the base layer and the inner layer of the corner portion are separated, The degree of freedom is given to the layer so that only the base material layer can move freely, the rubbing position can be changed, the apparent hardness of the laminate can be softened, and the occurrence of pinholes can be prevented. Can do.

  The packaging bag of the present invention has an unadhered or weakly bonded portion between the base material layer and the inner layer that rub against the inner surface of a container such as a paper box. The inner layer is separated from the inner layer, so that the base layer is given a degree of freedom, and only the base layer can move freely, the rubbing position can be changed, and the apparent hardness of the laminate can be softened. This produces an excellent effect that pinholes can be prevented from occurring.

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a development view for explaining a first embodiment of a packaging bag according to the present invention, FIG. 2 is a layer configuration diagram schematically showing one embodiment of a laminate constituting the packaging bag of FIG. 1, and FIG. FIG. 4 is a development view of the packaging bag of FIG. 3, and FIG. 5 is a partially cutaway perspective view showing an embodiment of the packaging bag packed in a paper box. 6 is a perspective view showing an embodiment of a state of a packaging bag filled with contents, FIG. 7 is a development view of the packaging bag shown in FIG. Body, 21 is a base material layer, 22 is an inner layer, A is an upper and lower heat bonding portion, B is a palm heat bonding portion, G is a gusset folding portion, P is a pinhole occurrence location, R is an unbonded portion or weakly bonded portion, S Indicates an end portion formed of a folded portion, and α indicates a paper box.

  First, problems of conventional packaging bags will be described. FIG. 5 is a partially cutaway perspective view showing an embodiment in which the packaging bag is packed in a paper box. The paper box α is a sealed end carton, and the packaging bag 1 in which the contents are individually packaged in the paper box α. Are packaged in tandem. A predetermined number of the paper boxes α in which the packaging bags 1 are packaged in this way are packed in a cardboard box and transported from the manufacturer to a distribution relay station or a store such as a supermarket or a convenience store.

  The packaging bag 1 packaged in the paper box α is a pillow-type packaging bag sealed with an edge thermal bonding portion composed of a joint thermal bonding portion B and an upper and lower thermal bonding portion A, as shown in FIG. Although not shown in the drawing, flat rectangular cutlets (kakimochi) baked with soy sauce or the like are packaged. And as shown in FIG. 6, the edge S which consists of the folding part of the both-ends part of the said packaging bag 1, and the intersection P (4 places) of the inner edge side of the peripheral thermal-bonding part A orthogonal to this edge S are a corner | angular part. Is forming.

  When the packaging bag 1 as described above is transported in a paper box α packaged in a column as shown in FIG. 5, the intersection P of the packaging bag 1 is rubbed against the inner surface of the paper box due to vibration or impact during transportation. A pinhole is generated in P, and oxygen or moisture enters from the pinhole, which may impair the texture and flavor of the baked potatoes with the contents, for example, soy sauce.

  The development view of the packaging bag 1 shown in FIG. 6 is as shown in FIG. 7, where the portion indicated by the broken line S ′ is the end portion S formed of the folded portion of the packaging bag 1, and is indicated by the oblique lines The locations indicated by the reference sign B ′ are locations where the heat-bonding part of the packaging bag 1 is formed, and the locations indicated by the upper and lower reference signs A ′, which are also indicated by diagonal lines, are the locations where the upper and lower heat-bonding parts A of the packaging bag 1 are provided. And the place (4 places) shown with the black dot shown with code | symbol P 'is a place used as the said intersection P where the pinhole of the packaging bag 1 generate | occur | produces.

  FIG. 1 is a development view illustrating a first embodiment of a packaging bag according to the present invention, and FIG. 2 is a layer configuration diagram schematically showing an embodiment of a laminated body constituting the packaging bag of FIG. As shown in FIG. 2, the bag 1 is composed of a laminate 2 having a base material layer 21 and an inner layer 22 made of a heat-adhesive resin layer, and is indicated by a symbol P ′ as shown in FIG. In a region R (region indicated by a circle) having a radius of 1.0 to 3.0 mm centered at the center, the space between the base material layer 21 and the inner layer 22 of the laminate 2 is an unbonded portion or a weakly bonded portion. It is configured. A pillow type packaging bag shown in FIG. 6 in which the contents, for example, baked potatoes baked with soy sauce or the like are individually packaged from the laminate 2 thus configured, is packaged in a paper box in tandem. Even when transported, even if the intersection P (see FIG. 6) of the packaging bag 1 rubs against the inner surface of the paper box α due to vibration or impact during transportation, the substrate layer 21 at the intersection P (see FIG. 6) Since the inner layer 22 is peeled off, a degree of freedom is given to the base material layer so that only the base material layer can move freely, the rubbing position can be changed, and the apparent hardness of the laminate is softened. It is possible to prevent the occurrence of pinholes.

  The unbonded or weakly bonded portion is usually formed by forming a printed layer on the back surface (the surface on the inner layer 22 side) of the base material layer 21, and on the inner layer 22 side of the printed layer. A release agent layer may be formed with a release ink in the region indicated by the symbol R shown in FIG. 1 with the printing register on the surface, and a method for increasing the total thickness of the laminate constituting the packaging bag. It is extremely cheap compared to this. Examples of the release ink include inks mainly composed of polyamide resins and mixed with nitrified cotton and cyclized rubber, inks composed of silicone and fluororesin, and inks composed of a mixture thereof. The adhesive strength (peel strength) between the base material layer 21 and the inner layer 22 is 0 to 0.7 N / 15 mm width. When the adhesive strength exceeds 0.7 N / 15 mm width, even if the intersection P (see FIG. 6) of the packaging bag 1 is rubbed against the inner surface of the paper box α due to vibration or impact during transportation, the intersection P (FIG. 6 In this case, no peeling occurs between the base material layer 21 and the inner layer 22, and pinholes cannot be prevented.

  FIG. 3 is a perspective view for explaining a second embodiment of the packaging bag according to the present invention. FIG. 4 is a developed view of the packaging bag of FIG. 3, and the packaging bag 10 has gusset folding portions G (FIG. 3) at both end portions. Pillow type that has an upper edge thermal bonding part consisting of a joint thermal bonding part B and an upper and lower thermal bonding part A (only the upper thermal bonding part is explicitly shown in FIG. 3). Although not shown, for example, the contents are made of a kneaded product such as wiener sausage, chikuwa or kamaboko. The pillow type packaging bag having the gusset folds G on both side ends can increase the capacity of the contents because of the gusset folds, and the bottom is formed into a rectangular shape to form the bottom. Therefore, it is possible to display the store in a stand-alone state, and it is a packaging form that has a greater appealing effect on products than flat placement, and is widely adopted. However, this type of product is usually packed in a cardboard box in a self-supporting state and transported from the manufacturer to a distribution relay station or a sales outlet such as a supermarket or a convenience store. There is a risk that pinholes may be generated by rubbing the corners of the bottom surface (denoted only in the three places indicated by symbol P in FIG. 3) with the inner surface (bottom surface) of the cardboard box. The portion indicated by P is located on the ridge line of the gusset folding part G, which is located on the line indicated by the broken line G1 in FIG. 4, and the lower symbol A indicated by the oblique line in FIG. 'Is the place where the lower heat-bonding portion A becomes, but the reference symbol P' on the upper reference symbol A 'side that becomes the upper adhesive portion A by the approximate folding width dimension of the gusset folding portion G from the inner edge of this reference symbol A'. 4 positions of black spots indicated by In addition, the broken line shown with the code | symbol G2 on FIG. 4 is a valley fold location of the gusset folding part G. FIG.

  Similarly to the first embodiment described above, the second embodiment also includes a laminate 2 including a base material layer 21 and an inner layer 22 made of a heat-adhesive resin layer, and is denoted by reference symbol P ′ in FIG. In the region R (region indicated by a circle) having a radius of 1.0 to 3.0 mm centered on the location indicated by, the base material layer 21 and the inner layer 22 of the laminate 2 are the same as in the first example. Even if the gap P is composed of an unbonded portion or a weakly bonded portion and the corner portion P (see FIG. 3) of the packaging bag 10 is rubbed against the inner surface of the cardboard box due to vibration or impact during transportation, the first embodiment Generation of pinholes can be prevented by the same function as described in.

Next, the laminated body 2 used for the packaging bags 1 and 10 of this invention is demonstrated.
Since the base material layer 21 of the laminate 2 is a basic material constituting the packaging bags 1 and 10, a synthetic resin film having excellent properties in mechanical, physical, chemical and the like is used. For example, a film made of a resin such as polyester, polyamide, or polypropylene, or a film in which a polyvinylidene chloride layer is provided on these films, or an inorganic vapor deposition layer such as aluminum or silicon oxide is provided. Can be used. Moreover, as these films, the film extended | stretched to the uniaxial direction thru | or biaxial direction is suitable. This is because usually the substrate layer 21 is often printed and printability is required. Further, the thickness of the film constituting the base material layer 21 may be any thickness as long as it can be kept to the minimum necessary with respect to strength, rigidity, etc. as a basic material, and can be determined in consideration of cost and the like. Although it should just be, it is about 12-25 micrometers in general.

  The inner layer 22 of the laminate 2 may be a layer formed from a heat-adhesive resin that can be melted by heat and welded to each other, and is appropriately selected depending on the physical properties required for the packaging bags 1 and 10. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer , Ethylene-vinyl acetate copolymer, ionomer resin, acid copolymer of ethylene and acrylic acid, ester copolymer of ethylene and acrylic acid ester, and the like.

  The laminate 2 may be provided with an outer layer on the surface side of the base material layer 21 as necessary. As the outer layer, for example, a film made of a resin such as polyester, polyamide, or polypropylene, or a film in which a polyvinylidene chloride layer is provided on these films, or silicon oxide, etc. Those provided with an inorganic vapor deposition layer can be used. In addition, as a method of laminating each layer, a known laminating method such as a sandwich lamination method or a dry lamination method may be used as appropriate.

  Next, the present invention will be described in more detail with reference to the following examples.

  Photoelectric tube marks are printed with urethane-based ink at a pitch of 105 mm (vertical direction pitch in FIG. 1) on the corona discharge-treated surface of a 20 μm-thick biaxially oriented polypropylene film, and printed with ink composed of polyamide-based resin and nitrified cotton. Then, a release agent layer is printed in a region R having a radius of 2 mm with the point indicated by P ′ as the center at the position indicated by P ′ in FIG. 1 (4), and then the urethane adhesive on the release agent layer surface. A laminated body of the present invention was produced by laminating an unstretched polypropylene film (laminated surface is a corona discharge treated surface) having a thickness of 20 μm.

[Comparative Example 1]
A laminate as a comparative example was produced in the same manner as in the example except that the release agent layer was not provided.

  Using the pillow wrapping machine, the laminated body of Example 1 and Comparative Example 1 produced above was flattened and packaged with two cutouts (width 48 mm × length 60 mm × thickness 8 mm). Each of the pillow type packaging bags shown in FIG. 6 having a length of 105 mm (the seal width of the peripheral heat-bonding portion is 7 mm) is prepared, and a paper box (inner dimensions: 92 mm wide × 155 mm high × 63 mm high) as shown in FIG. Eight bags were packaged in tandem. Each of the paper boxes was stacked in five stages and shrink-wrapped to form a stack, and further, the stack was stacked in a cardboard box in 2 × 3 rows (total of 6 stacks) with the stacking direction as the vertical direction. Each one of these cardboard boxes was transported by 500 km by a mixed flight, and the pinhole resistance was evaluated by the number of pinholes generated. Table 1 shows the results. In addition, the presence or absence of pinhole generation | occurrence | production is from the location shown with the code | symbol P on FIG. Liquid leakage was confirmed.

  As is clear from Table 1, the pillow packaging bag of Example 1 exhibited superior pinhole resistance as compared with Comparative Example 1.

It is an expanded view explaining 1st Example of the packaging bag concerning this invention. It is a layer block diagram which shows schematically one Example of the laminated body which comprises the packaging bag of FIG. It is a perspective view explaining 2nd Example of the packaging bag concerning this invention. It is an expanded view of the packaging bag of FIG. It is a partially notched perspective view which shows one Example of the state which packed the packaging bag in the paper box. It is a perspective view which shows one Example of the state of the packaging bag with which the content was filled. It is an expanded view of the packaging bag shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,10 Packaging bag 2 Laminate 21 Base material layer 22 Inner layer A Vertical heat bonding part B Joint heat bonding part G Gusset folding part P Pinhole generation | occurrence point R Unbonded part or weak adhesion part S End part which consists of a folding part alpha Paper box

Claims (3)

In a three-side seal type or pillow type packaging bag comprising a laminate having a base material layer and a heat adhesive resin layer on the inner layer and sealed by a peripheral heat bonding portion, an edge composed of a folded portion of the packaging bag and the edge A release agent layer is formed between the base material layer and the inner layer only in a predetermined region including an intersection on the inner edge side of the peripheral heat bonding portion orthogonal to the edge and not reaching the outer edge of the peripheral heat bonding portion; Between the inner layer is an unbonded portion or a weakly bonded portion, and in the portion other than the predetermined region, the base material layer and the inner layer are bonded by a sandwich lamination method or a dry lamination method. A packaging bag characterized in that only a weakly bonded portion can be peeled between a base material layer and an inner layer to prevent pinholes due to rubbing . To make the packaging bag self-supporting in a pillow-type packaging bag comprising a laminate having a base material layer and a heat-adhesive resin layer on the inner layer and sealed with a peripheral heat-bonding portion having gusset folding portions on both side ends. When the bottom is molded into a rectangular shape to form a bottom surface , a release agent layer is formed between the base material layer and the inner layer only in a predetermined region that includes the corners of the bottom surface and does not reach the outer edge of the peripheral thermal bonding portion. The base layer and the inner layer are unbonded or weakly bonded portions, and the portions other than the predetermined region are bonded to the base layer and the inner layer by a sandwich lamination method or a dry lamination method. A packaging bag characterized in that only the unbonded portion or the weakly bonded portion can be peeled between the base material layer and the inner layer to prevent pinholes due to rubbing . The packaging bag according to claim 1, wherein an adhesive strength of the non-bonded portion or the weakly bonded portion is 0 to 0.7 N / 15 mm width.