JP7317574B2 - buffer bag - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a shock-absorbing bag, particularly a shock-absorbing bag that protects contents from external pressure without being laminated and that can present a beautiful appearance.

For example, the following bags have been proposed as buffer bags for protecting contents from external pressure. A transportation bag has been proposed in which a cushioning sheet that forms a cushioning portion is placed inside the outer bag (see, for example, Patent Literature 1). In the shock-absorbing packing package formed by facing the first surface and the second surface and joining the peripheral edge with an opening left, the first surface and the second surface are overlapped with the inner film and the outer film, respectively. A buffer packaging package has been proposed in which a buffer gas is injected into a buffer gas space formed between an inner film and an outer film (see, for example, Patent Documents 2 and 3). A gas introduction path for introducing gas is provided at one end of the bag made of film, an injection gas check valve is connected to each part of the gas introduction path, and a plurality of gas cell rows are arranged side by side in the bag to A gas cushioning material has been proposed in which a gas cell array is filled with gas from an introduction channel through each injection check valve (see, for example, Patent Document 4).

JP-A-11-292144 JP-A-2010-89808 JP 2017-39523 A JP-A-2016-50028

However, in Patent Literature 1, the cushioning portion is only inside the outer bag and is not adhered to the outer bag, so there is a possibility that the cushioning portion may come off the outer bag. In addition, it is necessary to blow gas through a straw, and there is a problem that production takes time and costs. In Patent Document 2, there is a problem that the process for arranging the object to be packed so as to float by surrounding the object to be packed with the buffer gas space is complicated and costly. In addition, since the size of the bag must be larger than the size of the item to be packed, the size of the item to be packed is limited. Furthermore, it is necessary to blow in a buffer gas, and there is a problem that it takes time and cost to produce. Patent document 3 also has the problem that it is necessary to blow in a buffer gas, which takes time and cost to create. Patent Document 4 has a problem that the structure is complicated and large-scale manufacturing equipment is required.

SUMMARY OF THE INVENTION An object of the present disclosure is to provide a cushioning bag at a low cost that protects contents from external pressure without lamination and that can present a beautiful appearance.

A buffer bag according to the present invention includes an outer bag having a body portion made of a first base material and an inner bag having a body portion made of a second base material and disposed inside the outer bag. In a buffer bag that is a bag, the buffer bag includes a storage portion provided inside the inner bag, an inner surface of the first base material provided in a region facing the storage portion, and the second base material. a partition seal portion having a heat-bonded portion H1 with the outer surface of the, a first side edge sealing portion provided on the left side edge, and a second side edge sealing portion provided on the right side edge; wherein the compartment seal forms a plurality of gas cells between the first substrate and the second substrate, each of the gas cells sealing buffer air ; The first side edge sealing portion and the second side edge sealing portion are arranged along the thickness direction of the first base material and the second base material so that the inner surface of the first base material and the second base material are separated from each other. A thermally bonded portion H2 between the outer surface of the material, a thermally bonded portion H3 between the inner surfaces of the second substrate, and a thermally bonded portion between the outer surface of the second substrate and the inner surface of the first substrate. H4, wherein the first base material is natural paper, the second base material is a thermoplastic resin film, and the first base material and the second The thermoplastic resin forming the thermoplastic resin film impregnates the natural paper by 20% or more in the thickness direction at the heat-bonded portions H1, H2, and H4 with the base material.

In the shock-absorbing bag according to the present invention, the shock-absorbing bag includes a folded portion that is folded in two with the first base material and the second base material being superimposed on each other with the second base material facing inside; and an opening provided in an edge facing the folded portion, wherein the first side edge sealing portion and the second side edge sealing portion separate the folded portion and the edge facing the folded portion. In conclusion, the second base material has a male-female interlocking fitting provided on the inner surface along the edge of the opening, and the first base material and the second base material It is preferable to have a thermally bonded portion between the inner surface of the first base material and the outer surface of the second base material in a region between the portion where the base of the fitting is provided and the edge of the opening. It can be resealable with fittings.

In the shock-absorbing bag according to the present invention, the shock-absorbing bag includes a folded portion that is folded in two with the first base material and the second base material being superimposed on each other with the second base material facing inside; and an opening provided in an edge facing the folded portion, wherein the first side edge sealing portion and the second side edge sealing portion separate the folded portion and the edge facing the folded portion. In conclusion, the edges of the two first substrates constituting the edges of the opening are arranged to protrude on the opposite side of the folded portion than the edges of the two second substrates, and the first It is preferable that the base material has a male-female interlocking fitting provided on the inner surface of a portion that protrudes from the edge of the second base material along the edge of the opening. It can be resealable with fittings.

In the shock-absorbing bag according to the present invention, the first base material and the second base material are joined to each other by a joining seal portion provided closer to the folded portion than the fitting, and the joining seal portion preferably has a thermal bond between the inner surface of the first substrate and the outer surface of the second substrate. Since the joint portion between the first base material and the second base material increases, it is possible to further suppress the displacement between the first base material and the second base material.

In the cushioning bag according to the present invention, the folded portion is formed between the inner surface of the first base material and the outer surface of the second base material along the thickness direction of the first base material and the second base material. , a thermally bonded portion between the inner surfaces of the second substrate, and a thermally bonded portion between the outer surface of the second substrate and the inner surface of the first substrate. . It is possible to prevent the second base material from floating inside the bag at the folded portion.

In the buffer bag according to the present invention, the buffer bag has an opening sealing portion that seals the edge of the opening, and the first side edge sealing portion or the second side edge sealing portion Either one or both has a notch for opening in the region between the opening seal and the fitting, and the opening seal is located between the first substrate and the second substrate. Along the thickness direction, a thermally bonded portion between the inner surface of the first base material and the outer surface of the second base material, a thermally bonded portion between the inner surfaces of the second base material, and the second base material. It preferably has an outer surface of the material and a thermal bond with the inner surface of the first substrate. The unopened state can be ensured by the opening sealing portion. In the buffer bag according to the present invention, one side or both sides of the natural paper preferably have a barrier coating layer.

According to the present disclosure, it is possible to inexpensively provide a cushioning bag that protects the contents from external pressure without being laminated and that can present a beautiful appearance.

1 is a front view showing an example of a buffer bag according to this embodiment; FIG. FIG. 2 is a first example of a cross-sectional view taken along the line AA of FIG. 1; FIG. 3 is a partial enlarged view of the X portion of FIG. 2; FIG. 2 is a cross-sectional view taken along line BB of FIG. 1; FIG. 3 is a partial enlarged view of a Y portion of FIG. 2; FIG. 10 is a front view showing a modified example of the division seal portion, in which (a) is a form in which the division seal portion has an oblique lattice shape, (b) is a form in which the division seal portion is circular, and (c) is a form in which the division seal portion has a circular shape. In the form of horizontal lines, (d) is a form in which the partition seal portion has a large and small grid pattern. FIG. 5 is a front view showing an example of a modified example of the shock absorbing bag according to the present embodiment; FIG. 8 is a cross-sectional view taken along line CC of FIG. 7; FIG. 4 is a front view showing an example of a shock-absorbing bag having an opening sealing portion; FIG. 10 is a cross-sectional view taken along line DD of FIG. 9; FIG. 2 is a second example of a cross-sectional view taken along the line AA of FIG. 1;

Next, the present invention will be described in detail with reference to embodiments, but the present invention should not be construed as being limited to these descriptions. Various modifications may be made to the embodiments as long as the effects of the present invention are achieved.

As shown in FIGS. 1 to 4, the buffer bag 1 according to the present embodiment has an outer bag 2 having a body portion made of a first base material 91 and an outer bag having a body portion made of a second base material 92. 2, the buffer bag 1 is provided with a storage portion S1 provided inside the inner bag 3 and a region facing the storage portion S1. and a partition seal portion 7 having a heat-bonded portion H1 between the inner surface of the first base material 91 and the outer surface of the second base material 92 , and the partition seal portion 7 is connected to the first base material 91 . A plurality of gas cells 10 are formed between the second substrate 92 and each of the gas cells 10 seals buffer air.

For example, as shown in FIG. 1, the shock-absorbing bag 1 is a square-shaped bag body when viewed from the front, and has a folded portion 4 at the lower edge and first side edge sealing portions 6A and second side edge sealing portions 6A and 6A at the left and right side edges, respectively. The edge seal 6B preferably has an opening 5 at the upper edge. As for the shape of the cushioning bag 1, FIG. 1 shows a form having the folded portion 4 as an example, but the present invention is not limited to this. Alternatively, the cushioning bag 1 may have a configuration that does not have the folded portion 4 . As shown in FIG. 1, the form having the folded portion 4 is, for example, a bag formed by folding one sheet of film with a surface film and a back film. A form (not shown) having no folded portion 4 is, for example, a bag body in which the surface film and the back film are separate films, or a bag body in which the body and bottom are separate films such as a standing pouch. be.

The buffer bag 1 is a double bag having an outer bag 2 and an inner bag 3, as shown in FIG. In this double bag, a first base material 91 and a second base material 92 are integrally joined by sealing portions (for example, side edge sealing portions 6A and 6B). In addition, in this double bag, the first base material 91 that forms the body of the outer bag 2 and the second base material 92 that forms the body of the inner bag 3 are joined by the partition seal portion 7, It has one container S1, substantially like a single-layered bag. The accommodation portion S<b>1 is a space that communicates with the opening portion 5 .

The outer bag 2, as shown in FIGS. 1 and 2, is a part that constitutes the appearance of the bag. The body of the outer bag 2 is made of the first base material 91 . The first base material 91 may be any material that can seal buffer air in the gas cell 10, such as a thermoplastic resin film or natural paper.

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), 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) , polyphenylene sulfide (PPS), polysulfone (PSF), polyethersulfone (PES), amorphous polyarylate (PAR), liquid crystal polymer (LCP), polyetheretherketone (PEEK), thermoplastic polyimide (PI), Polyamideimide (PAI), thermoplastic polyurethane (TPU), or fluoropolymer (PTFE). The synthetic resin film may have a single layer structure or a laminated structure.

The biodegradable film is not particularly limited as long as it is a film made of biodegradable plastic, and is, for example, polylactic acid or polyglycolic acid. Also, the biodegradable plastic may be composed of polycaprolactone, polyhydroxyalkanoate, modified polyvinyl alcohol, casein or modified starch.

The natural paper may be Japanese paper or western paper, but is, for example, kraft paper or paraffin paper (waxed paper). By using natural paper, the appearance is excellent. In addition, it is possible to create a sense of luxury. In this embodiment, one side or both sides of the natural paper preferably have a barrier coating layer. The barrier coating layer can further suppress quality deterioration of the contents. The barrier coating layer may be provided only on the inner surface of the natural paper, only on the outer surface of the natural paper, or provided on both the inner and outer surfaces of the natural paper. The barrier coating layer may have biodegradability. Further, when a barrier coating layer is provided on the inner surface of the natural paper, the barrier coating layer preferably has thermal adhesiveness. When a barrier coating layer is provided on the outer surface of natural paper, the barrier coating layer preferably has printability. The barrier coating layer having biodegradability, thermal adhesiveness and printability includes, for example, Shield Plus (registered trademark) manufactured by Nippon Paper Industries Co., Ltd.

As shown in FIGS. 1 and 2, the inner bag 3 is provided inside the outer bag 2, and the internal space thereof serves as a housing portion S1. A body portion of the inner bag 3 is made of the second base material 92 . The second base material 92 may be any material as long as it can seal the buffer air in the gas cell 10, and for example, the materials listed for the first base material 91 can be used.

Either or both of the first base material 91 and the second base material 92 preferably have a barrier coating layer. Either one side or both sides of the first base material 91 or the second base material 92 may be applied to the barrier coating layer. The barrier coating layer is, for example, vapor deposition or coating.

Either one or both of the first base material 91 and the second base material 92 preferably have an uneven processed portion (not shown). Since the amount of air in the gas cell 10, which will be described later, increases, the buffering effect and the heat retaining effect are enhanced. The concave-convex processed portion is, for example, embossed. Moreover, examples of the base material having the concave-convex processed portion include Pearl Soft (registered trademark).

Both the first base material 91 and the second base material 92 may be synthetic resin films. With a wide variety of base materials, it is possible to meet various needs. Also, either one or both of the first substrate 91 and the second substrate 92 are preferably multilayer coextruded films. Barrier properties can be imparted.

Preferably, the first base material 91 is natural paper and the second base material 92 is a biodegradable film. The buffer bag 1 can be a fully degradable bag. One or both sides of the natural paper preferably have a barrier coating layer.

It is preferable that the first base material 91 is natural paper and the second base material 92 is a thermoplastic resin film. In this combination, since the surface of the natural paper has pores or unevenness caused by the entanglement of fibers, the molten or softened thermoplastic resin impregnates the surface of the natural paper or the pores or unevenness of the nonwoven fabric by capillary action. As a result, the two are more strongly bonded at the heat-bonded portions H1 to H13, which will be described later. In this way, since the adhesive strength is improved, compatibility is good. 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 the gap between the resin material and the non-resin material. That is, in the present embodiment, heat is applied to a resin material (for example, thermoplastic resin) to melt or soften it, impregnate it with a non-resin material (for example, natural paper), and heat-seal it, not for molecular bonding. . Conventionally, thermal bonding between materials that melt or soften has been generally used for heat sealing, but in the present invention, a material that does not melt or soften due to heat is impregnated with a material that melts or softens due to heat. It differs in that it is heat sealed. The thermoplastic resin constituting the thermoplastic resin film preferably impregnates 20 to 100%, more preferably 50 to 90%, of the natural paper in the thickness direction. Moreover, the thermoplastic resin constituting the thermoplastic resin film may impregnate the natural paper in an amount exceeding 100% in the thickness direction. Here, impregnation exceeding 100% means that the thermoplastic resin constituting the thermoplastic resin film permeates the natural paper so as to seep out to the outer surface.

As shown in FIG. 1, the partition seal portion 7 is provided in a region facing the housing portion S1. Here, the region facing the housing portion S1 is the region closer to the folded portion 4 than the fitting 8 is. It is preferable that the partition seal portion 7 is applied to both the front surface and the rear surface of the buffer bag 1 . As shown in FIG. 3, the partition seal portion 7 has a thermally bonded portion H1 between the inner surface of the first base material 91 and the outer surface of the second base material 92. As shown in FIG. The heat-bonded portion H1 is a portion where the inner surface of the first base material 91 and the outer surface of the second base material 92 are bonded by heat. At the thermally bonded portion H1, at least one of the first base material 91 and the second base material 92 is melted or softened by heat and adhered (fused) to the other, or the first base material 91 and the second base material are bonded together. Both of the two substrates 92 may be melted or softened and fixed (fused) to each other. As described above, in the buffer bag 1 according to the present embodiment, the first base material 91 and the second base material 92 are not attached by lamination or the like, and the first base material 91 and the second base material 92 are For example, it is directly fixed at the partition seal portion 7 by thermal adhesion. As a result, the contents can be protected from external pressure without lamination. In addition, a regular pattern, such as a grid pattern, is formed on the outer surface of the bag by the partition seal portion 7, so that a beautiful appearance can be realized.

As shown in FIGS. 1 and 3, the gas cell 10 is a closed space surrounded by the partition seal portion 7, and an air layer is formed. In this specification, each of the gas cells seals the buffer air means that there is no flow of buffer air between adjacent gas cells. The air layer of the gas cell 10 has an effect of impact resistance. In addition, the air layer can exhibit a heat insulating effect with excellent heat retention. For this reason, it is suitable as a take-out container for frozen foods or warm lunches.

The buffer air sealed in the gas cell 10 may be the air naturally included in the gas cell 10 when the compartment seal 7 is formed, or the air intentionally contained in the gas cell 10 when the compartment seal 7 is formed. It may be air that has been purposely sent.

In the shock absorbing bag 1 according to this embodiment, as shown in FIGS. The joint seal portion 9 preferably has a thermally bonded portion H6 between the inner surface of the first base material 91 and the outer surface of the second base material 92 . The joint seal portion 9 is preferably provided along the fitting 8 as shown in FIG. The joint seal portion 9 may be a continuous line as shown in FIG. 1 or an intermittent line (not shown). Of these, the joining seal portion 9 is more preferably continuous linear as shown in FIG. 1 in that the space between the first base material 91 and the second base material 92 is closed. 1, the space S2 surrounded by the heat-bonded portion H5 and the heat-bonded portion H6 of the bond-seal portion 9 is also buffered in the same manner as the gas cell. air can be sealed. Like the thermally bonded portion H1, the thermally bonded portion H6 is not laminated by lamination or the like, and the first base material 91 and the second base material 92 are directly fixed by thermal bonding. Since the bonding portion between the first base material 91 and the second base material 92 is increased by the thermally bonded portion H6, displacement between the first base material 91 and the second base material 92 can be further suppressed.

FIG. 6 is a front view showing a modification of the partition seal portion. In FIG. 1, as an example, a mode in which the partition seal portions 7 are provided in a grid pattern is shown, but the present invention is not limited to this. The partition seal portion 7 has, for example, an oblique lattice shape as shown in FIG. 6(a), a circular shape as shown in FIG. 6(b), and a horizontal linear shape as shown in FIG. , or a form having large and small grids as shown in FIG. 6(d). When the partition seal portion 7 has a circular shape as shown in FIG. 6B and the joining seal portion 9 has a continuous linear shape as shown in FIG. The space 10b of can be sealed with buffer air as well as the gas cell 10. FIG. As shown in FIG. 6(c), by providing the partition seal portion 7 in parallel with the flow direction of the base material (also called the MD direction) when manufacturing the buffer bag 1, air is sent into the gas cell 10 on the manufacturing line. Cheap. Further, as shown in FIG. 6(d), by changing the density of forming the partition seal portion 7, the gas cells 10 are composed of a small gas cell 10c containing a relatively small amount of air and a small gas cell 10c containing a relatively small amount of air. A configuration having a relatively large number of atmospheric cells 10d may be employed. As a result, the amount of air in the gas cell 10 can be adjusted, and the degree of buffering and heat retention can be adjusted.

It is preferable that the cushioning bag 1 according to this embodiment has fittings 8 . The fitting 8 may allow the housing portion S1 to be resealable. The shock-absorbing bag 1 according to this embodiment has a form (first example) in which the fitting 8 is provided on the second base material 92 (that is, the trunk of the inner bag 3) as shown in FIG. As shown, the fitting tool 8 is provided on the first base material 91 (that is, the body portion of the outer bag 2) (second example). Next, the shock absorbing bag 1 of the first example will be explained.

In the shock absorbing bag 1 of the first example according to the present embodiment, as shown in FIGS. A first side edge connecting the folded part 4 folded in two with the material 92 inside, the opening 5 provided at the edge facing the folded part 4, and the folded part 4 and the edge facing the folded part 4. It has a sealing portion 6A and a second side edge sealing portion 6B facing the first side edge sealing portion 6A. The first side edge sealing portion 6A and the second side edge sealing portion 6B, as shown in FIG. Along the thickness direction T of, a thermally bonded portion H2 between the inner surface of the first base material 91 and the outer surface of the second base material 92, a thermally bonded portion H3 between the inner surfaces of the second base material 92, It has a thermal bonding portion H4 between the outer surface of the second base material 92 and the inner surface of the first base material 91, and the first base material 91 and the second base material 92 are fitted together as shown in FIG. A thermal bonding portion H5 between the inner surface of the first base material 91 and the outer surface of the second base material 92 is provided in the region R between the portion where the base of the fitting 8 is provided and the edge of the opening 5. is preferred.

In the shock absorbing bag 1 of the first example, the male-female interlocking type fitting 8 includes a female member 8A projecting from one of the second substrates 92 facing each other in the opening 5 and the second base material 92, as shown in FIG. and a male member 8</b>B projecting from the other side of the base material 92 . The female member 8A and the male member 8B may be of any shape as long as they are removably engaged with each other. In FIG. 2, as an example, the female member 8A has a cross-sectional shape having an arrowhead-shaped head, and the male member 8B is a female member. Although the cross-sectional shape into which the head of the member 8A is fitted is concave and hooks facing each other are provided at both ends of the concave shape, the present invention is not limited to this. The fitting 8 may be integral with the second substrate 92 as shown in FIG. 2 or separate (not shown).

In the buffer bag 1 of the first example, FIG. 2 shows, as an example, a configuration in which the edges of the two first base materials 91 and the edges of the two second base materials 92 forming the edges of the opening are at the same height. However, the present invention is not limited to this, and a configuration in which the edges of the two first base materials 91 protrude on the opposite side of the folded portion 4 from the edges of the two second base materials 92 (not shown), The edges of the two second substrates 92 protrude from the edges of the two first substrates 91 to the opposite side of the folded portion 4 (not shown), or the edge of the second substrate 92 on one side across the opening 5 . Even if the first base material 91 and the second base material 92 on the other side of the first base material 91 and the second base material 92 protrude on the side opposite to the folded portion 4 (not shown). good.

The first side edge sealing portion 6A and the second side edge sealing portion 6B are, as shown in FIG. , H3, H4. In this specification, "along the thickness direction T of the first base material 91 and the second base material 92" means a virtual same It means that they are aligned on a straight line (not shown). 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. Like the thermally bonded portion H1, the thermally bonded portions H2 to H4 are not bonded by lamination or the like, and the first base material 91 and the second base material 92 are directly fixed by thermal bonding. there is The outer bag 2 and the inner bag 3 are integrally joined at the first side edge sealing portion 6A and the second side edge sealing portion 6B by the thermal bonding portions H2 to H4.

As shown in FIG. 5, the first base material 91 and the second base material 92 are arranged in a region R between the portion where the base of the fitting 8 is provided and the edge of the opening 5. and the outer surface of the second substrate 92 have a thermally bonded portion H5. As shown in FIG. 5, the portion where the base portion of the fitting 8 is provided is the portion closest to the folded portion 4 (shown in FIG. 2) among the portions where the female member 8A protrudes from the second base member 92. is. Like the thermally bonded portion H1, the thermally bonded portion H5 is not laminated by lamination or the like, and the first base material 91 and the second base material 92 are directly fixed by thermal bonding. Since the first base material 91 and the second base material 92 are integrally joined at the edge of the opening 5 by the thermal bonding portion H5, the fitting tool 8 can be opened more easily.

FIG. 7 is a front view showing an example of a modified example of the shock-absorbing bag according to this embodiment. 8 is a cross-sectional view taken along line CC of FIG. 7. FIG. In the cushioning bag 1 according to the present embodiment, the folded portion 4 extends along the thickness direction T of the first base material 91 and the second base material 92, as shown in FIGS. A thermally bonded portion H7 between the inner surface of the second substrate 92 and the outer surface of the second substrate 92, a thermally bonded portion H8 between the inner surfaces of the second substrate 92, an outer surface of the second substrate 92 and the first substrate 91 It is preferable to have a thermally bonded portion H9 on the inner surface of the . Like the thermally bonded portion H1, the thermally bonded portions H7 to H9 are not bonded by lamination or the like, and the first base material 91 and the second base material 92 are directly fixed by thermal bonding. there is The heat-bonded portions H7 to H9 can prevent the second base material 92 from floating inside the bag at the folded portion 4 .

FIG. 9 is a front view showing an example of a cushioning bag having an opening sealing portion. 10 is a cross-sectional view taken along line DD of FIG. 9. FIG. As shown in FIGS. 9 and 10, the buffer bag 1 according to the present embodiment has an opening sealing portion 11 for sealing the edge of the opening portion 5, and has a first side edge sealing portion. Either one or both of the stop portion 6A or the second side edge sealing portion 6B has a notch 12 for opening in a region between the opening sealing portion 11 and the fitting 8, and the opening sealing portion 11 along the thickness direction T of the first base material 91 and the second base material 92, the thermally bonded portion H10 between the inner surface of the first base material 91 and the outer surface of the second base material 92; It is preferable to have a thermally bonded portion H11 between the inner surfaces of the members 92 and a thermally bonded portion H12 between the outer surface of the second base material 92 and the inner surface of the first base material 91 .

The notch 12 is not particularly limited, and may be, for example, a V notch (shown in FIG. 7), an I notch (not shown), or damage processing such as scratching (not shown). The notch 12 may be provided only in the first side edge sealing portion 6A as shown in FIG. 7, or may be provided only in the second side edge sealing portion 6B (not shown). ), and may be provided on both the first side edge sealing portion 6A and the second side edge sealing portion 6B (not shown). In the cushioning bag 1 shown in FIGS. 9 and 10, when the cushioning bag 1 is cut open from the notch 12 along the fitting 8, an opening 5 is formed, for example, as shown in FIG. Like the thermally bonded portion H1, the thermally bonded portions H10 to H12 are not bonded by lamination or the like, and the first base material 91 and the second base material 92 are directly fixed by thermal bonding. there is By sealing the edge of the opening 5 with the opening sealing portion 11, the unopened state of the buffer bag 1 can be ensured. Although FIG. 10 shows a mode in which the folded portion 4 is not provided with the heat-bonded portion, a mode in which the heat-bonded portions H7 to H9 are provided as shown in FIG. 8 may be employed.

Next, the shock absorbing bag 1 of the second example will be described with reference to FIG. is the same as the buffer bag 1 of the first example. Therefore, the description of the common configuration will be omitted, and the different configuration will be described. In the shock-absorbing bag 1 of the second example according to the present embodiment, as shown in FIG. A first side edge sealing portion connecting the folded portion 4 folded inward and double-folded, the opening portion 5 provided at the edge facing the folded portion 4, and the folded portion 4 and the edge facing the folded portion 4. 6A and a second side edge sealing portion 6B facing the first side edge sealing portion 6A, and the edges of the two first substrates 91 constituting the edge of the opening 5 are separated by the two second side edge sealing portions 6A. The first base material 91 is arranged to protrude from the edge of the base material 92 on the side opposite to the folded part 4 , and the first base material 91 is arranged along the edge of the opening 5 so as to protrude beyond the edge of the second base material 92 . The first side edge sealing portion 6A and the second side edge sealing portion 6B, as shown in FIG. Along the thickness direction T of the second base material 92, heat is generated between the thermal bonding portion H2 between the inner surface of the first base material 91 and the outer surface of the second base material 92 and the inner surfaces of the second base material 92. It is preferable to have a bonding portion H3 and a thermal bonding portion H4 between the outer surface of the second base material 92 and the inner surface of the first base material 91 .

In the shock absorbing bag 1 of the second example, the edges of the two first base materials 91 forming the edges of the opening 5 are arranged to protrude on the side opposite to the folded part 4 more than the edges of the two second base materials 92. A fitting tool 8 is provided on the inner surface of the projecting portion of the first base material 91 . The shock-absorbing bag 1 of the second example preferably has a heat-bonded portion H13 between the edge of the second base material 92 and the first base material 91 . Contents can be prevented from entering between the first base material 91 and the second base material 92 by the heat-bonded portion H13.

The method of manufacturing the shock-absorbing bag 1 according to this embodiment is not particularly limited, but for example, it may be manufactured by the following method. Here, the manufacturing method will be described by taking the first example of the shock absorbing bag 1 shown in FIGS. 1 to 5 as an example, but the second example of the shock absorbing bag 1 can be manufactured by the same method.

First, the strip-shaped first base material 91 and the strip-shaped second base material 92 are folded in two so that the second base material 92 faces inside. The strip-shaped first base material 91 and the strip-shaped second base material 92 may each be fed out and supplied from a raw fabric roll wound into a roll. Moreover, it is preferable that the fitting tool 8 is molded integrally with the second base material 92 when the original fabric of the second base material 92 is manufactured. For example, according to inflation molding, the fitting 8 can be molded integrally with the second base material 92 .

Next, in a state in which the first base material 91 and the second base material 92 are folded in half and overlapped, the side edge sealing portions (the first side edge sealing portion 6A and the second side edge sealing portion) extending in the direction intersecting the longitudinal direction ) are formed by thermal bonding at predetermined intervals.

After that, the partition seal portion 7 is formed by thermal bonding in the area facing the housing portion using a seal bar or a mold having a predetermined shape. At this time, when the division seal portion 7 is formed, the portion surrounded by the division seal portion 7 of the first base material 91 is sucked, and an air flow is generated from the material roll side of the first base material 91 and the second base material 92. You may let With these, the amount of buffer air contained in the gas cell 10 can be increased.

The joining seal portion 9 is formed before the side edge sealing portions 6A and 6B are formed, formed after the side edge sealing portions 6A and 6B are formed, or formed at the same time as the partition seal portion 7 is formed. You may

When the first base material 91 is natural paper and the second base material 92 is a thermoplastic resin film, in providing the heat-bonded portions H1 to H13, one side of the portion to be heat-bonded (upper side during bag making) ), but depending on the thickness of the first base material 91 (natural paper), both sides (upper and lower sides during bag making) of the part to be thermally bonded may be heated with a seal bar at the same time. Alternatively, after heating with a seal bar from one side of the part to be thermally bonded (upper side during bag making), the other side (lower side during bag making) may also be heated with a seal bar. . This makes it possible to more stably impregnate the natural paper of the first base material 91 with the thermoplastic resin of the second base material 92 .

1 Buffer Bag 2 Outer Bag 3 Inner Bag 4 Folding Part 5 Opening 6A First Side Edge Sealing Part 6B Second Side Edge Sealing Part 7 Division Sealing Part 8 Fitting Tool 8A Female Member 8B Male Member 9 Joint Sealing Part 10 Gas cell 10a Space inside the circle 10b Space outside the circle 10c Small gas cell 10d Large gas cell 11 Opening sealing part 12 Notch 91 First base material 92 Second base material H1 to H13 Thermal bonding part R Region S1 Accommodating part S2 Space T thickness direction

Claims (7)

A buffer bag that is a double bag comprising an outer bag having a body portion made of a first base material and an inner bag having a body portion made of a second base material and arranged inside the outer bag,
The buffer bag is heat-bonded between a storage section provided inside the inner bag, and an inner surface of the first base material and an outer surface of the second base material provided in a region facing the storage section. a partition seal portion having a portion H1 , a first side edge sealing portion provided on the left side edge, and a second side edge sealing portion provided on the right side edge,
the compartment seal forms a plurality of gas cells between the first substrate and the second substrate, each of the gas cells sealing buffer air ;
The first side edge sealing portion and the second side edge sealing portion are arranged along the thickness direction of the first base material and the second base material so that the inner surface of the first base material and the second side edge seal part are formed. A thermally bonded portion H2 between the outer surface of the substrate, a thermally bonded portion H3 between the inner surfaces of the second substrate, and a thermally bonded portion between the outer surface of the second substrate and the inner surface of the first substrate. and a part H4,
The first base material is natural paper, and the second base material is a thermoplastic resin film,
In the heat-bonded portions H1, H2, and H4 between the first base material and the second base material, the thermoplastic resin constituting the thermoplastic resin film is distributed in the thickness direction of the natural paper. A buffer bag characterized by being impregnated by 20% or more . The buffer bag is provided at a folded portion in which the first base material and the second base material are superimposed and folded in half with the second base material facing inside, and at an edge facing the folded part. and an opening formed in the
The first side edge sealing portion and the second side edge sealing portion connect the folded portion and an edge facing the folded portion,
The second base material has a male-female interlocking fitting provided on the inner surface along the edge of the opening,
The first base material and the second base material are arranged such that an inner surface of the first base material and a second 2. The shock-absorbing bag according to claim 1, which has a heat-bonded portion with the outer surface of the base material. The buffer bag is provided at a folded portion in which the first base material and the second base material are superimposed and folded in half with the second base material facing inside, and at an edge facing the folded part. and an opening formed in the
The first side edge sealing portion and the second side edge sealing portion connect the folded portion and an edge facing the folded portion,
The edges of the two first substrates constituting the edges of the opening are arranged so as to protrude on the opposite side of the folded portion from the edges of the two second substrates,
3. The first base material has a male-female interlocking fitting provided on the inner surface of a portion that protrudes from the edge of the second base material along the edge of the opening. 1. The buffer bag according to 1. The first base material and the second base material are bonded to each other by a bonding seal portion provided closer to the folded portion than the fitting, and the bonding seal portion is attached to the first base material. 4. The shock-absorbing bag according to claim 2, further comprising a heat-bonded portion between the inner surface and the outer surface of the second base material. The folded portion includes a thermal bonding portion between the inner surface of the first base material and the outer surface of the second base material along the thickness direction of the first base material and the second base material, and the second base material. 5. The method according to any one of claims 2 to 4, characterized in that it has a thermally bonded portion between the inner surfaces of two base materials and a thermally bonded portion between the outer surface of the second base material and the inner surface of the first base material. The buffer bag according to any one of the above. The buffer bag has an opening sealing portion that seals the edge of the opening, and
either one or both of the first side edge seal or the second side edge seal has a tear notch in a region between the opening seal and the fitting;
The opening sealing part includes a thermally bonded part between the inner surface of the first base material and the outer surface of the second base material along the thickness direction of the first base material and the second base material; 2. A heat-bonded portion between the inner surfaces of the second base material, and a heat-bonded portion between the outer surface of the second base material and the inner surface of the first base material. 6. The buffer bag according to any one of -5. The buffer bag according to any one of claims 1 to 6, wherein one or both sides of said natural paper have a barrier coating layer.

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