JP2021001021A - Multiple bag - Google Patents

Abstract

To inexpensively provide a resealable multiple bag with a fitting tool.SOLUTION: A multiple bag 1 according to the present disclosure includes an outer bag 2 having a body part composed of a porous base material, and an inner bag 3 having a body part composed of a thermoplastic resin film, in which the multiple bag has a storage part S1, an opening 5, a bottom part 4, a first side edge sealing part 6A and a second side edge sealing part 6B, the first side edge sealing part 6A and the second side edge sealing part 6B have a porous base material and a thermal adhesion part H1, a thermal adhesion part H2 and a thermal adhesion part H3 in a thickness direction T of a thermoplastic resin film, the edge of the opening has a thermal adhesion part H8, and the thermal adhesion parts H1, H3 and H8 of the porous base materials in the thermal adhesion parts with the thermoplastic resin film are impregnated with 20-100% of the thermoplastic resin of the thermoplastic resin film in the thickness direction of the porous base material.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to multiple bags.

Various forms have been proposed as a bag body with a fitting that can be resealed. For example, a bag body with a synthetic resin fastener that facilitates the opening of a plurality of bag portions of different sizes and the removal of stored items has been proposed (see, for example, Patent Document 1). A synthetic resin bag body has been proposed in which a plurality of bag portions are integrally formed so that each bag portion can be separately stored (see, for example, Patent Document 2). A double bag with a fitting is proposed in which an inner bag is further stored inside the outer bag and each bag can be sealed by a fitting provided in each bag (for example, Patent Document 3). reference.). A packaging container for storing compact discs is proposed in which a non-woven fabric is placed between the two sheets, a fastener is attached to the top of the two sheets, and the two sheets and the non-woven fabric are integrally fixed by fusing. (See, for example, Patent Document 4).

Japanese Unexamined Patent Publication No. 2000-25794 Japanese Unexamined Patent Publication No. 2005-145536 Japanese Unexamined Patent Publication No. 2012-20436 JP-A-2010-269825

Since the bag body with the fitting tool can be resealed, it is often used for a long period of time after opening as compared with the bag body without the fitting tool, which makes the bag more aesthetically pleasing. The body was sought after. However, Patent Documents 1 to 4 do not propose a bag body with a fitting that takes aesthetics into consideration.

It is an object of the present disclosure to provide multiple bags at low cost.

The multiple bag according to the present invention is a multiple bag including an outer bag having a body made of a porous base material and an inner bag having a body made of a thermoplastic resin film, and the multiple bag is a storage part. , An opening communicating with the accommodating portion, a bottom portion provided on an edge facing the opening, a first side edge sealing portion connecting the opening and the bottom portion, and the first side edge sealing. It has a second side edge sealing portion facing the portion, and the first side edge sealing portion and the second side edge sealing portion have the thickness of the porous base material and the thermoplastic resin film. Along the direction, the heat-bonding portion between the inner surface of the porous substrate and the outer surface of the thermoplastic resin film, the heat-bonding portion between the inner surfaces of the thermoplastic resin film, and the thermoplastic resin film. It has a heat-bonding portion between the outer surface and the inner surface of the porous base material, and the edge of the opening is heat-bonding between the inner surface of the porous base material and the outer surface of the thermoplastic resin film. The thermoplastic resin of the thermoplastic resin film has a portion, and the thermoplastic resin of the thermoplastic resin film is formed in the heat-bonding portion between the porous base material and the thermoplastic resin film in the heat-bonding portion in the thickness direction of the porous base material. It is characterized by being impregnated with 20 to 100%.

In the multiple bag according to the present invention, the multiple bag has a line sealing portion having a heat-bonding portion between the inner surface of the porous base material and the outer surface of the thermoplastic resin film in a region facing the storage portion. It is preferable to prepare. Since the number of joints between the porous base material of the outer bag and the thermoplastic resin film of the inner bag increases, it is possible to further suppress the deviation between the porous base material of the outer bag and the thermoplastic resin film of the inner bag.

In the multiple bag according to the present invention, the bottom portion is formed by the inner surface of the porous base material and the outer surface of the thermoplastic resin film along the thickness direction of the porous base material and the thermoplastic resin film. It is preferable to have a heat-bonding portion, a heat-bonding portion between the inner surfaces of the thermoplastic resin film, and a heat-bonding portion between the outer surface of the thermoplastic resin film and the inner surface of the porous base material. It is possible to prevent the thermoplastic resin film of the inner bag from floating inward of the bag at the bottom.

The multilayer bag according to the present invention includes a form in which the thermoplastic resin of the thermoplastic resin film is impregnated with more than 100% in the thickness direction of the porous base material.

In the multiple bag according to the present invention, it is preferable that the multiple bag includes a male-female occlusal type fitting tool provided on the inner surface along the edge of the opening. It can be resealed by a fitting.

The multiple bag according to the present invention includes a form in which the multiple bag is an aesthetic bag.

In the multiple bag according to the present invention, the multiple bag further has one or more additional bags in addition to the outer bag and the inner bag, and the additional bag is arranged inside the inner bag. Alternatively, it is arranged between the inner bag and the outer bag, or is arranged outside the outer bag, and the base material of the body of the additional bag is a porous base material, a thermoplastic resin film, and a metal. Includes forms that include at least one of the foils.

According to the present disclosure, multiple bags can be provided at low cost.

It is a front view which shows the 1st example of the multi-layer bag which concerns on this embodiment. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is sectional drawing BB of FIG. It is a front view which shows the 2nd example of the multi-layer bag which concerns on this embodiment. FIG. 4 is a cross-sectional view taken along the line CC of FIG. It is a front view which shows the 3rd example of the multiple bag which concerns on this embodiment. FIG. 6 is a sectional view taken along line DD of FIG. It is a partially enlarged view of the X part of FIG. It is a partially enlarged view of the Y part of FIG. It is a front view which shows the modification of the wire seal part, (a) is the form which the line seal part has an oblique lattice shape, (b) is the form which the line seal part has a circular shape, (c) is the form which the line seal part has a circular shape A form having a horizontal line shape, (d) is a form in which the line seal portion has a large and small grid shape. It is a front view which shows the 4th example of the multiple bag which concerns on this embodiment. 11 is a cross-sectional view taken along the line EE of FIG.

Next, the present invention will be described in detail by showing embodiments, but the present invention is not construed as being limited to these descriptions. The embodiments may be modified in various ways as long as the effects of the present invention are exhibited.

Next, among the multiple bags according to the present embodiment, a bag that expresses a unique aesthetic appearance by applying various designs such as printing, ground pattern, or dyed pattern to a porous base material (hereinafter referred to as a aesthetic bag). However, the present invention is not limited to this. The multiple bag according to the present invention also includes a form in which the appearance is not particularly aesthetically pleasing, for example, a form in which the porous base material remains plain or a form in which only monochromatic printing is performed.

FIG. 1 is a front view showing a first example of the multiple bags according to the present embodiment. FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. As shown in FIGS. 1 to 3, the multiple bag 1 according to the present embodiment includes an outer bag 2 having a body made of a porous base material, an inner bag 3 having a body made of a thermoplastic resin film, and the like. In the multiple bag including, the multiple bag 1 has an accommodating portion S1, an opening 5 communicating with the accommodating portion S1, a bottom portion 4 provided on an edge facing the opening 5, and an opening 5 and a bottom portion 4. It has a first side edge sealing portion 6A to be tied and a second side edge sealing portion 6B facing the first side edge sealing portion 6A, and has a first side edge sealing portion 6A and a second side edge sealing. As shown in FIG. 3, the stop portion 6B is a heat-bonded portion between the inner surface of the porous base material and the outer surface of the thermoplastic resin film along the thickness direction T of the porous base material and the thermoplastic resin film. It has H1, a heat-bonding portion H2 between the inner surfaces of the thermoplastic resin film, and a heat-bonding portion H3 between the outer surface of the thermoplastic resin film and the inner surface of the porous base material, and the edge of the opening is As shown in FIG. 2, it has a heat-bonded portion H8 between the inner surface of the porous base material and the outer surface of the thermoplastic resin film, and the thermoplastic resin of the thermoplastic resin film is porous in the heat-bonded portion. The heat-bonded portions H1, H3, and H8 of the base material and the thermoplastic resin film are impregnated with 20 to 100% in the thickness direction of the porous base material.

As shown in FIG. 1, the multiple bag 1 preferably has a quadrangular bag body when viewed from the front, with a bottom portion 4 on the lower edge and a first side edge sealing portion 6A and a second side on the left and right side edges, respectively. It is preferable to have the edge sealing portion 6B and the opening 5 on the upper edge. The accommodating portion S1 is an internal space of the multiple bag 1, and is provided inside, for example, the innermost surface of the base material. FIG. 2 shows, as an example, a form in which the base material serving as the innermost surface is a thermoplastic resin film constituting the body portion of the inner bag 3, and the accommodating portion S1 is the internal space of the inner bag 3. The shape of the multiple bag 1 is shown in FIG. 1 as having a bottom portion 4 as an example, but the present invention is not limited thereto. Further, the multiple bag 1 may have a form that does not have the bottom portion 4. As shown in FIG. 1, the form having the bottom portion 4 is, for example, a bag body formed by folding back one film of a front surface film and a back surface film. The form without the bottom 4 (not shown) is, for example, a bag in which the front surface film and the back surface film are separate films, and a bag in which the body and bottom 4 are separate films such as a standing pouch. is there.

As shown in FIGS. 1 and 2, the outer bag 2 is a part that constitutes the appearance of the bag. The body of the outer bag 2 is made of a porous base material. The porous base material is not particularly limited as long as it is a material that can be impregnated with the thermoplastic resin of the thermoplastic resin film. The porous base material is, for example, natural paper, a woven fabric made by weaving fibers, or a non-woven fabric. Natural paper is not particularly limited, but is, for example, kraft paper. The fibers of the woven fabric are not particularly limited, and include, for example, biodegradable fibers and synthetic fibers. Biodegradable fibers are, for example, natural fibers such as cotton, silk, linen, mohair, wool or cashmere, or regenerated fibers such as acetate, cupra or rayon. Synthetic fibers are, for example, polyamide (trade name: nylon (NY)), polyurethane or polyester. The type of the non-woven fabric is not particularly limited, and is, for example, a synthetic resin non-woven fabric or a biodegradable non-woven fabric. The synthetic resin of the synthetic resin non-woven fabric is not particularly limited, and is, for example, polyethylene such as high-density polyethylene (HDPE), medium-density polyethylene (MDPE) or low-density polyethylene (LDPE), polypropylene (PP), and polyvinylidene chloride (PVDC). ), Polyvinyl chloride (PVC), Polystyrene (PS), Polyvinyl acetate (PVAC), Polytetrafluoroethylene (PTFE), ABS resin (Acrylonitrile butadiene styrene resin), AS resin (SAN), Acrylic resin (PMMA), Polyamide (PA) / trade name nylon, polyacetal (POM), polycarbonate (PC), modified polyphenylene ether (m-PPE, modified PPE, PPO), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), cyclic polyolefin (COP) ), Polyphenylensulfide (PPS), Polysulfone (PSF), Polyethersulfone (PES), Acrylic polyarylate (PAR), Liquid crystal polymer (LCP), Polyetheretherketone (PEEK), Plastic polyimide (PI) , Polyethyleneimide (PAI), thermoplastic polyurethane (TPU), or fluororesin. The biodegradable resin of the biodegradable non-woven fabric is not particularly limited, and is, for example, polylactic acid or polyglycolic acid. Further, the biodegradable plastic may contain polycaprolactone, polyhydroxyalkanoate, modified polyvinyl alcohol, casein or modified starch as components.

The porous substrate can exhibit a unique aesthetic appearance by applying various designs such as printing, ground pattern or dyed pattern. Therefore, the multiple bag 1 according to the present embodiment is a aesthetic bag, which utilizes the aesthetics of the porous base material to be a packaging bag for amenity in accommodation facilities such as hotels, or sweets, rice, natural foods, etc. It is also suitable as a packaging bag. Further, the multiple bag 1 is suitable as a packaging bag for tea, coffee, black tea, etc. because the outer surface is covered with a porous base material and has a light-shielding property.

In the present embodiment, it is preferable that one side or both sides of the porous base material has a barrier coating layer. The barrier coating layer can further suppress the deterioration of the quality of the contents. The barrier coating layer is provided only on the inner surface of the porous base material, is provided only on the outer surface of the porous base material, or is provided on both the inner surface and the outer surface of the porous base material. It may be. When the porous base material and the thermoplastic resin film are biodegradable, the barrier coating layer is preferably biodegradable. Further, when the barrier coating layer is provided on the inner surface of the porous base material, the barrier coating layer preferably has thermal adhesiveness. When the barrier coating layer is provided on the outer surface of the porous substrate, the barrier coating layer preferably has printability. Examples of the barrier coating layer having biodegradability, heat adhesion and printability include Shield Plus (registered trademark) manufactured by Nippon Paper Industries, Ltd.

As shown in FIGS. 1 and 2, the inner bag 3 is a portion internally provided in the outer bag 2. The body of the inner bag 3 is made of a thermoplastic resin film. Thermoplastic resin films include synthetic resin films and biodegradable films. The material of the synthetic resin film is not particularly limited, but for example, polyethylene such as high-density polyethylene (HDPE), medium-density polyethylene (MDPE) or low-density polyethylene (LDPE), polypropylene (PP), and polyvinylidene chloride (PVDC). , Polyvinyl chloride (PVC), Polystyrene (PS), Polyvinyl acetate (PVAc), Polytetrafluoroethylene (PTFE), ABS resin (Acrylonitrile butadiene styrene resin), AS resin (SAN), Acrylic resin (PMMA), Polyamide (PA) / Trade name Nylon, Polyacetal (POM), Polycarbonate (PC), Modified polyphenylene ether (m-PPE, Modified PPE, PPO), Polybutylene terephthalate (PBT), Polyethylene terephthalate (PET), Cyclic polyolefin (COP) , Polyphenylensulfide (PPS), Polysulfone (PSF), Polyethersulfone (PES), Acrylic polyarylate (PAR), Liquid crystal polymer (LCP), Polyetheretherketone (PEEK), Thermoplastic polyimide (PI), Polyethyleneimide (PAI), thermoplastic polyurethane (TPU), or fluororesin. The material of the biodegradable film is not particularly limited, and is, for example, polylactic acid or polyglycolic acid. Further, the biodegradable plastic may contain polycaprolactone, polyhydroxyalkanoate, modified polyvinyl alcohol, casein or modified starch as components. The thermoplastic resin film may have a single-layer structure or a laminated structure such as an extruded laminated film, a dry laminated film, or a multi-layer coextruded film.

In the present embodiment, the thermoplastic resin film includes a thermoplastic resin film with a metal vapor deposition film and a foamed film. The type of metal of the metal vapor-deposited film of the thermoplastic resin film with the metal-deposited film is not particularly limited, and is, for example, aluminum, zinc, or copper. When the thermoplastic resin film constituting the body of the inner bag 3 includes the thermoplastic resin film with a metal vapor deposition film, the thermoplastic resin film is separated from the surface of the thermoplastic resin film with a metal vapor deposition film on the metal vapor deposition film side. It is preferable that the structure is such that the thermoplastic resin film of No. 1 or another thermoplastic resin layer is laminated. With another thermoplastic resin film or another thermoplastic resin layer, the inner bag 3 can be thermally adhered to the porous base material of the outer bag 2 or the base material of an additional bag (not shown) described later. The foamed film is not particularly limited, and is, for example, a foamed polyethylene film, a foamed polystyrene film, or a foamed polypropylene film. By using the foam film, it is possible to give the multiple bag 1 a pearl-like texture. When the thermoplastic resin film constituting the body of the inner bag 3 contains a foamed film, the thermoplastic resin film has a laminated structure in which another thermoplastic resin film or another thermoplastic resin layer is laminated on the foamed film. Is preferable. Such a laminated film is, for example, a co-extruded film of polyethylene foam and polyethylene. In the above, the material of another thermoplastic resin film or another thermoplastic resin layer is not particularly limited, and the materials listed as the materials of the thermoplastic resin film constituting the body of the inner bag 3 may be used. it can.

The multiple bag 1 according to the present embodiment preferably includes a male-female occlusal type fitting 8 provided on the inner surface along the edge of the opening 5. It can be resealed by the fitting 8.

As shown in FIG. 2, the male-female occlusal type fitting 8 has a female member 8A projecting from one of the base materials facing each other in the opening 5 and a male member 8B projecting from the other. .. Here, the base material facing the opening 5 is, for example, a thermoplastic resin film constituting the body of the inner bag when the inner bag 3 constitutes the innermost surface of the multiple bag 1, as shown in FIG. is there. FIG. 2 shows a form in which the fitting 8 is integrally molded with the thermoplastic resin film constituting the body of the inner bag 3, but the present invention is not limited to this, and the fitting 8 is thermoplastic. It is separate from the resin film and may be attached by thermal bonding. The female member 8A and the male member 8B may have a shape that engages with each other so as to be disengaged from each other. As an example in FIG. 2, the female member 8A has a shape having an arrowhead-shaped head, and the male member 8B is a female. Although the cross-sectional shape of the member 8A into which the head of the member 8A fits is concave and hooks facing each other are provided at the tips on both sides thereof, the present invention is not limited to this.

As shown in FIG. 3, the first side edge sealing portion 6A and the second side edge sealing portion 6B are heat-bonded portions H1 and H2 along the thickness direction T of the porous substrate and the thermoplastic resin film. , H3. In the present specification, "along the thickness direction T of the porous base material and the thermoplastic resin film" means a virtual identical straight line extending in the thickness direction T of the porous base material and the thermoplastic resin film (not shown). ) Means lined up. Although FIG. 3 shows the first side edge sealing portion 6A as a representative, the second side edge sealing portion 6B also has the same structure as the first side edge sealing portion 6A. The heat-bonded portions H1 and H3 are portions in which the inner surface of the porous base material and the outer surface of the thermoplastic resin film are heat-bonded. In the heat-bonding portions H1 and H3, the thermoplastic resin film is melted or softened by heat and fixed (fused) to the porous substrate. The heat-bonded portion H2 is a portion in which the inner surfaces of the thermoplastic resin films are heat-bonded to each other. In the heat-bonding portion H2, the thermoplastic resin films facing each other due to heat are fixed (fused) by melting or softening.

Further, in the multiple bag 1 according to the present embodiment, the edge of the opening 5 has a heat-bonded portion H8 as shown in FIG. The heat-bonded portion H8 is a portion in which the inner surface of the porous base material and the outer surface of the thermoplastic resin film are heat-bonded. In the heat-bonding portion H8, the thermoplastic resin film is melted or softened by heat and fixed (fused) to the porous substrate. FIG. 2 shows a form in which adjacent edges of the openings 5 provided with the heat-bonded portion H8 have the same height, but the present invention is not limited to this, and one edge is more than the other edge. It may be arranged so as to project on the side opposite to the bottom portion 4. As a result, the adjacent edges of the openings 5 are arranged with steps, so that the edges of the openings 5 can be easily displaced by the fingertips and can be opened more easily.

In the heat-bonding portions H1, H3, and H8, which are the heat-bonding parts between the porous base material and the thermoplastic resin film, the thermoplastic resin film is melted or softened by heat and fixed (fused) to the porous base material. There is. Here, since the surface of the porous substrate has pores or irregularities caused by the entanglement of fibers or the like, the melt or softened product of the thermoplastic resin becomes the pores or irregularities on the surface of the porous substrate due to the capillary phenomenon. By impregnating, both are firmly bonded at the heat-bonded portions H1, H3 and H8. When the porous substrate is a woven fabric, the impregnation fixes the fibers of the woven fabric at the ends to the thermoplastic resin. Therefore, fraying of the end portion can be prevented. As used herein, the term "impregnation" refers to a technique of press-fitting a thermoplastic resin material melted or softened by heat into a non-resin material and curing the material to fill a gap between the resin material and the non-resin material. That is, in the present embodiment, the resin material (thermoplastic resin film) is heated to be melted or softened, impregnated into the non-resin material (porous base material), and heat-sealed. Absent. Conventionally, heat adhesion between materials that are generally melted or softened has been used for heat sealing, but in the present invention, a material that is not melted or softened by heat is impregnated with a material that is melted or softened by heat. It differs in that it is heat-sealed. The thermoplastic resin of the thermoplastic resin film is 20 in the thickness direction of the porous base material at the heat-bonding portion (in FIG. 2, heat-bonding portions H1, H3 and H8) between the porous base material and the thermoplastic resin film. It is preferably impregnated to ~ 100%, more preferably 50 to 90%. By setting the impregnation ratio within the above range, the adhesion between the porous base material and the thermoplastic resin film becomes stronger. In addition, it is possible to further prevent the woven fabric from fraying.

The multiple bag according to the present embodiment includes a form in which the thermoplastic resin of the thermoplastic resin film is impregnated with more than 100% in the thickness direction of the porous base material. Here, impregnation in excess of 100% in the thickness direction of the porous base material means that the thermoplastic resin constituting the thermoplastic resin film has penetrated to the outer surface of the porous base material so as to seep out. Say.

As described above, in the multiple bag 1 according to the present embodiment, the porous base material and the thermoplastic resin film which are the base materials are not bonded by a material such as an adhesive, and the porous base material and the thermoplastic resin film are combined. Is directly fixed by impregnation in the first side edge sealing portion 6A and the second side edge sealing portion 6B. As a result, the multiple bags 1 can be provided at a lower cost without making a large capital investment such as an adhesive coating device.

FIG. 4 is a front view showing a second example of the multiple bags according to the present embodiment. FIG. 5 is a cross-sectional view taken along the line CC of FIG. In the multilayer bag 1 according to the present embodiment, the bottom portion 4 is formed with the inner surface of the porous base material and the inner surface of the porous base material along the thickness direction T of the porous base material and the thermoplastic resin film, as shown in FIGS. 4 and 5. The heat-bonding portion H4 with the outer surface of the thermoplastic resin film, the heat-bonding portion H5 between the inner surfaces of the thermoplastic resin film, and the heat-bonding portion between the outer surface of the thermoplastic resin film and the inner surface of the porous base material. It is preferable to have H6. Similar to the heat-bonding parts H1 and H3, the heat-bonding parts H4 and H6, which are the heat-bonding parts between the porous base material and the thermoplastic resin film, are firmly bonded by impregnation between the porous base material and the thermoplastic resin film. doing. By providing the heat-bonding portions H4, H5, and H6, it is possible to prevent the thermoplastic resin film of the inner bag 3 from floating inward of the bag at the bottom portion 4.

Next, a third example of the multiple bag according to the embodiment will be described with reference to FIGS. 6 to 9. In the multiple bag 1 according to the present embodiment, as shown in FIG. 6, the multiple bag 1 thermally adheres the inner surface of the porous base material and the outer surface of the thermoplastic resin film to the region facing the accommodating portion S1. It is preferable to include a line seal portion 7 having a portion H7 (shown in FIGS. 8 and 9). Since the number of joints between the porous base material of the outer bag 2 and the thermoplastic resin film of the inner bag 3 increases, the displacement between the porous base material of the outer bag 2 and the thermoplastic resin film of the inner bag 3 can be further suppressed. Can be done.

As shown in FIG. 6, the wire seal portion 7 is provided in a region facing the accommodating portion S1. Here, the region facing the accommodating portion S1 is the region on the bottom 4 side of the fitting 8. The wire seal portion 7 is preferably provided on both the front surface and the back surface of the multiple bag 1. As shown in FIGS. 8 and 9, the wire sealing portion 7 preferably has a heat-bonding portion H7 between the inner surface of the porous base material of the outer bag 2 and the outer surface of the thermoplastic resin film of the inner bag 3. .. Similar to the heat-bonded parts H1 and H3, the heat-bonded portion H7 has a porous base material and a thermoplastic resin film firmly bonded by impregnation. As described above, the porous base material and the thermoplastic resin film are directly fixed by heat bonding at the wire sealing portion 7, and are not bonded by laminating or the like. As a result, the porous base material of the outer bag 2 and the thermoplastic resin film of the inner bag 3 are integrated without laminating the porous base material of the outer bag 2 and the thermoplastic resin film of the inner bag 3 by laminating. Can be joined. As a result, the multiple bags including the outer bag 2 and the inner bag 3 can be made substantially like a bag having a single structure at a lower cost. Further, since the line sealing portion 7 forms a regular pattern such as a grid pattern on the outer surface of the bag, a higher aesthetic appearance can be exhibited.

FIG. 10 is a front view showing a modified example of the line seal portion. FIG. 6 shows a form in which the line seal portions 7 are provided in a grid pattern as an example, but the present invention is not limited to this. The line seal portion 7 has, for example, a diagonal grid shape as shown in FIG. 10 (a), a circular shape as shown in FIG. 10 (b), and a horizontal line shape as shown in FIG. 10 (c). As shown in FIG. 10D, the form may have a large and small grid pattern.

The multiple bag 1 according to the present embodiment has an opening sealing portion (not shown) for sealing the edge of the opening 5, and has a first side edge sealing portion 6A or a second side edge sealing portion 6B. Either one or both of the above includes a form having a notch (not shown) for opening in the region between the opening sealing portion and the fitting 8. In the opening sealing portion, the inner surface and thermoplasticity of the porous substrate and the thermoplastic resin film are along the thickness direction T of the porous substrate and the thermoplastic resin film, similarly to the heat-bonded portions H1, H2, and H3 shown in FIG. It has a heat-bonding portion with the outer surface of the resin film, a heat-bonding portion between the inner surfaces of the thermoplastic resin film, and a heat-bonding portion between the outer surface of the thermoplastic resin film and the inner surface of the porous base material. Is preferable. Further, the notch is not particularly limited, and may be, for example, damage processing by V notch, I notch, scratch processing, or the like. Further, the notch may be provided only in the first side edge sealing portion 6A, may be provided only in the second side edge sealing portion 6B, or may be provided only in the first side edge sealing portion 6A and the first side edge sealing portion 6A. It may be provided on both of the second side edge sealing portions 6B. By sealing the edge of the opening 5 with the opening sealing portion, the unopened state of the multiple bag 1 can be ensured. In this form, when the porous substrate is thick, such as a woven fabric, especially a towel cloth, it is preferable to have an opening auxiliary line communicating with the notch. The opening auxiliary line is, for example, a perforation, a laser cut line, or a half cut line.

When the porous base material is a woven fabric, in the multiple bag 1 according to the present embodiment, the edge of the opening 5, the edge of the first side edge sealing portion 6A, and the edge of the second side edge sealing portion 6B are porous. It is preferable to further have an anti-fray structure for the quality substrate. Examples of the multiple bags having an anti-fray structure include the following forms.

In the multiple bag 1 according to the present embodiment, as an anti-fray structure, the edge of the opening 5, the edge of the first side edge sealing portion 6A, and the edge of the second side edge sealing portion 6B are each made of a thermoplastic resin film. It preferably has a structure coated with a thermoplastic resin. Here, the structure coated with the thermoplastic resin is a structure in which the melt or softened product of the thermoplastic resin covers the edge of the porous base material at each edge, and the melted or softened product of the thermoplastic resin at each edge. Includes a structure in which the object extends outside the bag rather than the porous substrate.

In the multiple bag 1 according to the present embodiment, as an anti-fray structure, the edge of the opening 5, the edge of the first side edge sealing portion 6A, and the edge of the second side edge sealing portion 6B are each provided with a hot melt adhesive. It is preferable to have a coated structure.

In the multiple bag according to the present embodiment, as the fray prevention structure, the intersection angle between the fiber of the woven fabric which is the porous base material and the edge of the opening 5, the fiber of the woven fabric and the first side edge sealing portion 6A It is preferable to have a structure in which the intersection angle with the edge and the intersection angle between the fiber of the woven fabric and the edge of the second side edge sealing portion 6B are 2 ° or more, respectively. By providing a predetermined crossing angle, the fiber direction of the woven fabric is not parallel to the edge of the opening 5, the edge of the first side edge sealing portion 6A, and the edge of the second side edge sealing portion 6B. It can be made more difficult to fray. Each intersection angle is preferably 3 ° or more, and more preferably 5 ° or more. The upper limit of each intersection angle is not particularly limited, but is preferably 45 ° or less, and more preferably 30 ° or less.

In the multiple bag according to the present embodiment, as a fray prevention structure, it is preferable that the edge of the first side edge sealing portion 6A and the edge of the second side edge sealing portion 6B have a melted cross section. By fusing, a melt or softened product of the thermoplastic resin of the thermoplastic resin film is formed on the edge of the first side edge sealing portion 6A and the edge of the second side edge sealing portion 6B, and the melt or softened product is formed. Since the porous base material is covered with the material, it can be made more difficult to fray. The melted cross section can be confirmed by, for example, visually observing the edge of the first side edge sealing portion 6A and the end face of the edge of the second side edge sealing portion 6B or observing with a microscope. For example, the following judgment can be made. When the end has a melted cross section, the seal width is about 1 to 1.5 mm, and the end face is jagged by the melt or softened product of the thermoplastic resin. On the other hand, when the edge is a non-melted cross section cut after heat bonding, the seal width is wide (for example, about 5 mm), and the end face is straight and flat.

In the multiple bag 1 according to the present embodiment, as a fray prevention structure, a fray prevention film is heat-bonded to the front surface and the back surface of the first side edge sealing portion 6A, and the front surface and the front surface of the second side edge sealing portion 6B and It is preferable to have a structure in which a fray prevention film is heat-bonded to the back surface. The fray-preventing film preferably has, for example, a multilayer structure having a base film layer and a sealant layer. The material of the base film layer is not particularly limited, and is, for example, polyethylene terephthalate (PET), polyamide (trade name: nylon (NY)), or biaxially stretched polypropylene (OPP). The material of the sealant layer is not particularly limited, and is, for example, polyethylene (PE) or ethylene-vinyl acetate copolymer resin (EVA). Since the first side edge sealing portion 6A and the second side edge sealing portion 6B are sandwiched by the anti-fray film, the resin of the sealant layer of the anti-fray film is entangled with the fibers of the woven fabric to prevent fraying. Can be prevented. Further, by using the fray prevention film, in addition to the fray prevention effect, for example, the following effects are also obtained. Since the first side edge sealing portion 6A and the second side edge sealing portion 6B are reinforced with the anti-fray film, the first side edge sealing portion 6A and the second side edge sealing portion 6A and the second side edge sealing portion are manufactured when the multiple bag 1 is manufactured. When 6B is cut by a shear cut method or the like, the cutting blade bites into the porous substrate is reduced, and the shear stress is increased. As a result, the effect of improving the cutting property can be obtained. When the first side edge sealing portion 6A and the second side edge sealing portion 6B are heat-bonded, a fray-preventing film is interposed between the porous base material and the heat seal bar, so that the porous base material is synthesized. Even when a material having poor heat resistance such as fiber is contained, solid seal can be applied. Further, when the porous base material is a natural fiber such as cotton or linen, it is difficult to melt the first side edge sealing portion 6A and the second side edge sealing portion 6B during the production of the multiple bag 1, and the bag frays. By using the preventive film, cutting by the shear cut method becomes easy. Further, since the base film layer of the anti-fray film can be printed or metal-deposited, the product can be produced by appropriately selecting the design of the anti-fray film according to the design of the porous base material of the multiple bag 1. You can increase the variation of the design and enhance the aesthetics.

The multiple bag 1 according to the present embodiment is a multiple bag including an outer bag 2 and an inner bag 3. In the present embodiment, the multiple bag is not limited to a double-structured bag (sometimes referred to as a double bag) composed of an outer bag 2 and an inner bag 3 as shown in FIGS. 1 and 2, and the outer bag is not limited to the outer bag. In addition to the 2 and the inner bag 3, the bag may have a structure further having one or more additional bags (not shown). The additional bag may be arranged inside the inner bag 3, may be arranged between the inner bag 3 and the outer bag 2, or may be arranged outside the outer bag 2. For example, as an example of the case where the multiple bag 1 is a bag having a triple structure (sometimes called a triple bag) having one additional bag (not shown) in addition to the outer bag 2 and the inner bag 3, FIG. 1 and FIG. This is a triple bag in which an additional bag (not shown) having a body made of a porous base material is further provided inside the inner bag 3 of the multiple bag 1 shown in FIG. In this example of the triple bag, the thermoplastic resin film of the inner bag 3 is sandwiched between two porous substrates, and may be regarded as an adhesive layer. In the triple bag of the above example, the porous base material of the additional bag, which is the innermost surface, is adhered to the porous base material of the additional bag by using the thermoplastic resin of the thermoplastic resin film of the inner bag 3 as the porous base material. It may be carried out by impregnating more than 100% in the thickness direction of the bag and then heat-adhering it with the impregnated thermoplastic resin, or by making a hole such as punching in the porous base material of the additional bag to make an inner bag 3 The thermoplastic resin film of the above may be exposed and partially heat-bonded by the exposed thermoplastic resin film. Further, in the triple bag of the above-mentioned example, the fitting 8 may be attached to the body portion made of the porous base material of the additional bag which is the innermost surface by thermal adhesion, or the inner bag 3 may be attached at the edge of the opening 5. Whether the edge of the thermoplastic resin film is projected from the edge of the porous base material of the additional bag to the side opposite to the bottom 4, and the fitting 8 is integrally formed with the projected portion of the thermoplastic resin film. Alternatively, it may be attached by thermal bonding. The base material of the body of the additional bag is not particularly limited, and in addition to the porous base material mentioned in the example, for example, a metal foil such as a thermoplastic resin film or an aluminum foil may be used. Further, the base material of the body of the additional bag may have a single-layer structure or a laminated structure such as an extruded laminated film, a dry laminated film or a multi-layer co-extruded film.

As the base material of the body of the additional bag, as the porous base material or the thermoplastic resin film, those listed as the material of the body of the outer bag 2 or the body of the inner bag 3 can be used. When the body of the additional bag is a thermoplastic resin film containing a thermoplastic resin film with a metal vapor deposition film, the additional bag is arranged inside the inner bag 3 or between the inner bag 3 and the outer bag 2. In this case, the thermoplastic resin film preferably has a laminated structure in which another thermoplastic resin film or another thermoplastic resin layer is laminated on the surface of the thermoplastic resin film with a metal vapor deposition film on the metal vapor deposition film side. Further, when the body of the additional bag is a thermoplastic resin film containing a thermoplastic resin film with a metal vapor deposition film and the additional bag is arranged outside the outer bag 2, the thermoplastic resin film is made of metal. It has a single-layer structure consisting of only a thermoplastic resin film with a vapor-deposited film, or another thermoplastic resin film or another thermoplastic resin layer is laminated on the surface of the thermoplastic resin film with a metal-deposited film on the metal-deposited film side. It may have a laminated structure. When the thermoplastic resin film has a single-layer structure consisting of only a thermoplastic resin film with a metal vapor-deposited film, it is preferable that the surface of the metal-deposited film is arranged so as to be on the side opposite to the outer bag 2 side. When the thermoplastic resin film has a laminated structure of a thermoplastic resin film with a metal vapor deposition film and another thermoplastic resin film or another thermoplastic resin layer, another thermoplastic resin film or another thermoplastic resin layer is outside. It is preferable that the film is arranged so as to come to the bag 2 side.

The method for producing the multiple bag 1 according to the present embodiment is not particularly limited, but may be produced by, for example, the following method.

First, the strip-shaped porous base material and the strip-shaped thermoplastic resin film are folded in half by stacking two sheets so that the thermoplastic resin film is on the inside. The strip-shaped porous base material and the strip-shaped thermoplastic resin film may be fed out from the raw fabric rolls wound in a roll shape, respectively. Further, it is preferable that the fitting 8 is formed by integrally molding the raw fabric of the thermoplastic resin film with the thermoplastic resin film at the time of manufacturing. For example, according to inflation molding, the fitting 8 can be integrally molded with the thermoplastic resin film. Next, in a state where the porous base material and the thermoplastic resin film are folded in half and overlapped with each other, the side edge sealing portions (first side edge sealing portion 6A and second side edge sealing) extending in the direction intersecting in the longitudinal direction The stopper 6B is included) is formed by thermal bonding at predetermined intervals. Then, the side edge sealing portion is cut into individual multiple bags 1. In the present embodiment, when the porous base material is a woven fabric, it is more likely to be manufactured by so-called fusing, in which the side edge sealing portion is thermally bonded and the side edge sealing portion is cut at the same time, from the viewpoint of preventing fraying. preferable. Further, when the thickness of the porous base material is relatively thick, a separate cutting step may be provided after heat bonding. From the viewpoint of preventing fraying, a step may be provided in which the thermoplastic resin of the thermoplastic resin film is further melted by applying a heat seal to the cut surface again after cutting. When a fray-preventing film is used, the side edge is sealed after the side edge sealing portion (including the first side edge sealing portion 6A and the second side edge sealing portion 6B) is heat-bonded and before the cutting step. It is preferable to apply a strip-shaped anti-fray film to the front surface and the back surface of the sealing portion to heat-adhere to the porous substrate. Alternatively, when the porous substrate contains a material having poor heat resistance such as synthetic fiber, the side edge sealing portion (including the first side edge sealing portion 6A and the second side edge sealing portion 6B) is heat-bonded. Before this, apply a strip-shaped anti-fray film to the front and back surfaces of the side edge sealing portion to heat-bond the side edge sealing portion, and at the same time heat the fray prevention film and the side edge sealing portion. It may be bonded. As a result, even if the porous base material contains a material having poor heat resistance, the side edge sealing portion can be solid-sealed. By heat-bonding the fray prevention film, the cut surface can be reinforced and fray can be prevented.

In providing the heat-bonded portions H1 to H8, the seal bar may be used to heat only from one side (upper side at the time of bag making) of the heat-bonded portion, but the heat-bonded portions are heat-bonded depending on the thickness of the porous base material. Both sides of the part (upper side and lower side during bag making) are heated with the seal bar at the same time, or one side of the heat-bonded part (upper side during bag making) is heated with the seal bar and then the other side. You may also heat with the seal bar from the side (lower side at the time of bag making). This makes it possible to more stably impregnate the porous base material with the thermoplastic resin of the thermoplastic resin film.

Further, as shown in FIGS. 6 to 10, in the form having the wire seal portion 7, the wire seal portion 7 is formed by, for example, heat-bonding with a seal bar or a mold having a predetermined shape. Can be done.

Although FIGS. 1 to 10 show a form in which the multiple bag 1 includes a fitting 8, the multiple bag 1 according to the present embodiment does not include the fitting 8 as shown in FIGS. 11 and 12. Including morphology.

1 Multiple bag 2 Outer bag 3 Inner bag 4 Bottom 5 Opening 6A 1st side edge sealing part 6B 2nd side edge sealing part 7 Wire sealing part 8 Fitting tool 8A Female member 8B Male member H1, H2, H3 H4, H5, H6, H7, H8 Thermal bonding part S1 Accommodating part T Thickness direction

The multiple bag according to the present invention is a multiple bag including an outer bag having a body made of a porous base material and an inner bag having a body made of a thermoplastic resin film, and the multiple bag is a storage part. , An opening communicating with the accommodating portion, a bottom portion provided on an edge facing the opening, a first side edge sealing portion connecting the opening and the bottom portion, and the first side edge sealing. It has a second side edge sealing portion facing the portion, and the first side edge sealing portion and the second side edge sealing portion have the thickness of the porous base material and the thermoplastic resin film. Along the direction, the heat-bonding portion between the inner surface of the porous substrate and the outer surface of the thermoplastic resin film, the heat-bonding portion between the inner surfaces of the thermoplastic resin film, and the thermoplastic resin film. It has a heat-bonding portion between the outer surface and the inner surface of the porous base material, and the edge of the opening is heat-bonding between the inner surface of the porous base material and the outer surface of the thermoplastic resin film. The thermoplastic resin of the thermoplastic resin film has a portion, and the thermoplastic resin of the thermoplastic resin film is formed in the heat-bonding portion between the porous substrate and the thermoplastic resin film in the heat-bonding portion in the thickness direction of the porous substrate. The multi-layer bag is impregnated with 20 to 100%, and the multiple bag is a line sealing portion having a heat-bonding portion between the inner surface of the porous base material and the outer surface of the thermoplastic resin film in a region facing the housing portion. characterized in that it comprises a. By providing the wire seal portion, the joint portion between the porous base material of the outer bag and the thermoplastic resin film of the inner bag increases, so that the difference between the porous base material of the outer bag and the thermoplastic resin film of the inner bag can be prevented. It can be more suppressed.

As shown in FIG. 2, the male-female occlusal type fitting 8 has a male member 8A projecting from one of the base materials facing each other in the opening 5 and a female member 8B projecting from the other. .. Here, the base material facing the opening 5 is, for example, a thermoplastic resin film constituting the body of the inner bag when the inner bag 3 constitutes the innermost surface of the multiple bag 1, as shown in FIG. is there. FIG. 2 shows a form in which the fitting 8 is integrally molded with the thermoplastic resin film constituting the body of the inner bag 3, but the present invention is not limited to this, and the fitting 8 is thermoplastic. It is separate from the resin film and may be attached by thermal bonding. The male member 8A and the female member 8B may have a shape that engages with each other so as to be disengaged from each other. As an example in FIG. 2, the male member 8A has a cross-sectional shape having an arrowhead-shaped head, and the female member 8B is a male member. Although the cross-sectional shape of the member 8A into which the head of the member 8A fits is concave and hooks facing each other are provided at the tips on both sides thereof, the present invention is not limited to this.

1 Multiple bag 2 Outer bag 3 Inner bag 4 Bottom 5 Opening 6A 1st side edge sealing part 6B 2nd side edge sealing part 7 Wire sealing part 8 Fitting tool 8A Male member 8B Female member H1, H2, H3 H4, H5, H6, H7, H8 Thermal bonding part S1 Accommodating part T Thickness direction

Claims (7)

In a multi-layer bag including an outer bag having a body made of a porous base material and an inner bag having a body made of a thermoplastic resin film.
The multiple bags include an accommodating portion, an opening communicating with the accommodating portion, a bottom portion provided on an edge facing the opening portion, and a first side edge sealing portion connecting the opening portion and the bottom portion. , A second side edge sealing portion facing the first side edge sealing portion, and
The first side edge sealing portion and the second side edge sealing portion are the inner surface of the porous substrate and the thermoplastic along the thickness direction of the porous substrate and the thermoplastic resin film. A heat-bonding portion with the outer surface of the resin film, a heat-bonding portion between the inner surfaces of the thermoplastic resin film, and a heat-bonding portion between the outer surface of the thermoplastic resin film and the inner surface of the porous substrate. Have,
The edge of the opening has a heat-bonding portion between the inner surface of the porous substrate and the outer surface of the thermoplastic resin film.
The thermoplastic resin of the thermoplastic resin film is impregnated with 20 to 100% in the thickness direction of the porous base material in the heat-bonded portion between the porous base material and the thermoplastic resin film in the heat-bonded portion. A multi-layered bag characterized by being plastic. The multiple bag is characterized in that a line sealing portion having a heat-bonding portion between the inner surface of the porous base material and the outer surface of the thermoplastic resin film is provided in a region facing the housing portion. The multiple bag according to 1. The bottom portion includes a heat-bonding portion between the inner surface of the porous base material and the outer surface of the thermoplastic resin film along the thickness direction of the porous base material and the thermoplastic resin film, and the thermoplasticity. The invention according to claim 1 or 2, wherein the resin film has a heat-bonding portion between the inner surfaces of the resin film and a heat-bonding portion between the outer surface of the thermoplastic resin film and the inner surface of the porous base material. Multiple bags. The multiple bag according to any one of claims 1 to 3, wherein the thermoplastic resin of the thermoplastic resin film is impregnated with more than 100% in the thickness direction of the porous base material. .. The multiple bag according to any one of claims 1 to 4, wherein the multiple bag comprises a male-female occlusal type fitting provided on an inner surface along the edge of the opening. The multiple bag according to any one of claims 1 to 5, wherein the multiple bag is an aesthetic bag. The multiple bag further comprises one or more additional bags in addition to the outer bag and the inner bag.
The additional bag is placed inside the inner bag, between the inner bag and the outer bag, or outside the outer bag.
The multiple bag according to any one of claims 1 to 6, wherein the base material of the body of the additional bag contains at least one of a porous base material, a thermoplastic resin film, and a metal foil. ..

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