JP7453452B2 - buffer bag - Google Patents

Description

The present disclosure relates to a buffer bag, and particularly to a buffer bag that is not laminated and can protect the contents from external pressure and has an aesthetic appearance.

For example, the following bags have been proposed as buffer bags that protect the contents from external pressure. A transportation bag has been proposed that includes a buffer sheet that forms a buffer section inside the outer bag (see, for example, Patent Document 1). In a buffer packaging package formed by making a first surface part and a second surface part face each other and joining the peripheral parts with an opening left, the first surface part and the second surface part are formed by overlapping an interior film and an exterior film, respectively. A buffer packaging package has been proposed in which a buffer gas is injected into a buffer gas space formed between an interior film and an exterior film (for example, see Patent Documents 2 and 3). A gas introduction path for introducing gas is provided at one end of the film bag, an injection gas check valve is connected to each part of the gas introduction path, and a plurality of gas cell rows are installed in the bag to introduce gas. A gas cushioning material has been proposed in which a gas cell array is filled with gas from an introduction path through each injection check valve (for example, see Patent Document 4).

Japanese Patent Application Publication No. 11-292144 Japanese Patent Application Publication No. 2010-89808 JP 2017-39523 Publication JP 2016-50028 Publication

However, in Patent Document 1, the buffer portion is merely housed inside the outer bag and is not bonded to the outer bag, so there is a risk that the buffer portion may come off from the outer bag. In addition, it is necessary to blow gas through a straw, which poses a problem in that it takes time and cost to manufacture. In Patent Document 2, there is a problem that the process for arranging the packaged items so as to float them so that the packaged items are surrounded by the buffer gas space is complicated and costly. Further, since the size of the bag body needs to be larger than the size of the object to be packed, the size of the object to be packed is limited. Furthermore, it is necessary to blow in a buffering gas, which poses a problem in that it takes time and cost to manufacture. Patent Document 3 also had the problem that it was necessary to blow buffering gas into it, and that it took time and cost to create. Patent Document 4 has a problem that the structure is complicated and requires large-scale manufacturing equipment.

An object of the present disclosure is to provide an inexpensive buffer bag that protects the contents from external pressure without being laminated and is aesthetically pleasing.

The buffer bag according to the present invention includes an outer bag having a body made of a first base material, and an inner bag having a body 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 part provided inside the inner bag, a region facing the storage part , and a body of the outer bag of the first base material. a compartment sealing part having a thermally bonded part between an inner surface of a part constituting the inner bag and an outer surface of a part of the second base material constituting the body part of the inner bag; , a plurality of gas cells are formed between the first base material and the second base material, each of the gas cells seals buffer air, and the buffer air is sealed between adjacent gas cells. There is no air going in and out, and the gas cells are characterized by having small gas cells that contain a relatively small amount of air and air cells that contain a relatively large amount of air.

In the buffer bag according to the present invention, the buffer bag includes a folded portion in which the first base material and the second base material are overlapped and folded in half with the second base material facing inside; an opening provided on an edge facing the folded part, a first side edge sealing part connecting the folded part and the edge facing the folded part, and a second side edge sealing part facing the first side edge sealing part. the second base material has a male-male interlocking fitting provided on the inner surface along the edge of the opening, and the first side edge sealing portion has a side edge sealing portion; and the second side edge sealing part is configured to prevent heat 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. an adhesive part, a thermally adhesive part between the inner surfaces of the second base material, and a thermally adhesive part between the outer surface of the second base material and the inner surface of the first base material, and the first The base material and the second base material have an inner surface of the first base material and an outer surface of the second base material in a region between a portion where the base of the fitting tool is provided and an edge of the opening. It is preferable to have a thermally bonded portion to the surface. It can be made resealable by a fitting.

In the buffer bag according to the present invention, the buffer bag includes a folded portion in which the first base material and the second base material are overlapped and folded in half with the second base material facing inside; an opening provided on an edge facing the folded part, a first side edge sealing part connecting the folded part and the edge facing the folded part, and a second side edge sealing part facing the first side edge sealing part. and a side edge sealing portion, wherein the edges of the two first base materials constituting the edges of the opening protrude further than the edges of the two second base materials on the opposite side of the folded portion. and the first base material has a male and female interlocking type 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, The first side edge sealing part and the second side edge sealing part are arranged to connect the inner surface of the first base material and the second base material along the thickness direction of the first base material and the second base material. A thermally bonded portion between the outer surface of the base material, a thermally bonded portion between the inner surfaces of the second base material, and a thermally bonded portion between the outer surface of the second base material and the inner surface of the first base material. It is preferable to have the following. It can be made resealable by a fitting.

In the buffer 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 tool, and the joining seal portion preferably has a thermally bonded portion between the inner surface of the first base material and the outer surface of the second base material. Since the number of joints between the first base material and the second base material increases, misalignment between the first base material and the second base material can be further suppressed.

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

In the buffer bag according to the present invention, the buffer bag has an opening sealing part that seals an edge of the opening, and the first side edge sealing part or the second side edge sealing part Either or both have an opening notch in a region between the opening sealing part and the fitting tool, and the opening sealing part is located between the first base material and the second base material. Along the thickness direction, a thermally bonded portion between the inner surface of the first base material and an 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 is preferable to have a thermally bonded portion between the outer surface of the material and the inner surface of the first base material. An unopened state can be ensured by the opening sealing part.

According to the present disclosure, it is possible to provide a buffer bag that protects contents from external pressure without being laminated and is aesthetically pleasing at a low cost.

It is a front view showing an example of a buffer bag concerning this embodiment. 2 is a first example of a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a partially enlarged view of the X section in FIG. 2. FIG. 2 is a sectional view taken along line BB in FIG. 1. FIG. FIG. 3 is a partially enlarged view of portion Y in FIG. 2; FIG. 7 is a front view showing a modified example of the compartment seal part, in which (a) the compartment seal part has a diagonal lattice shape, (b) the compartment seal part has a circular shape, and (c) the compartment seal part has a circular shape; (d) is a form in which the partition seal portion has a lattice shape of different sizes. It is a front view which shows an example of the modification of the buffer bag based on this embodiment. 8 is a sectional view taken along line CC in FIG. 7. FIG. It is a front view which shows an example of the buffer bag which has an opening sealing part. 10 is a sectional view taken along line DD in FIG. 9. FIG. This is a second example of a cross-sectional view taken along the line AA in FIG. 1.

Next, the present invention will be described in detail by showing embodiments, but the present invention should not be interpreted as being limited to these descriptions. The embodiments may be modified in various ways 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 includes an outer bag 2 having a body made of a first base material 91 and an outer bag having a body made of a second base material 92. In the buffer bag, which is a double bag, the buffer bag 1 includes a storage section S1 provided inside the inner bag 3, and an area facing the storage section S1. The partition seal part 7 has a heat bonding part 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 part 7 has a A plurality of gas cells 10 are formed between the second base material 92 and each gas cell 10 seals buffer air.

For example, as shown in FIG. 1, the buffer bag 1 is a rectangular bag body when viewed from the front, and has a folded part 4 on the lower edge, and a first side edge sealing part 6A and a second side edge on the left and right side edges, respectively. It is preferable that the edge sealing portion 6B has an opening 5 at the upper edge. Although the shape of the buffer bag 1 is shown as having a folded portion 4 as an example in FIG. 1, the present invention is not limited to this. Further, the buffer bag 1 may have a form without the folded portion 4. As shown in FIG. 1, the bag having the folded portion 4 is, for example, a bag in which a front film and a back film are formed by folding back one film. Forms (not shown) that do not have the folded part 4 include, for example, a bag in which the front film and the back film are separate films, and a bag in which the trunk 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 a sealing portion (for example, side edge sealing portions 6A, 6B). In addition, in this double bag, the first base material 91 that constitutes the body of the outer bag 2 and the second base material 92 that constitutes the body of the inner bag 3 are joined at the partition seal part 7, so that It has one accommodating part S1 like a substantially single-layered bag. The housing portion S1 is a space communicating with the opening portion 5.

The outer bag 2 is a part that constitutes the external appearance of the bag, as shown in FIGS. 1 and 2. The body of the outer bag 2 is made of a first base material 91. The first base material 91 may be any material that can seal buffer air in the gas cell 10, and is, for example, 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 includes, 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)/Product 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 fluororesin (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. The biodegradable plastic may also contain polycaprolactone, polyhydroxyalkanoate, modified polyvinyl alcohol, casein, or modified starch.

The natural paper may be Japanese paper or Western paper, but for example, it may be kraft paper or paraffin paper (waxed paper). By using natural paper, it has an excellent appearance. Moreover, a sense of luxury can be created. In this embodiment, it is preferable that one or both sides of the natural paper have a barrier coating layer. The barrier coating layer can further suppress deterioration in the quality 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 on both the inner and outer surfaces of the natural paper. The barrier coating layer may be biodegradable. Further, when a barrier coating layer is provided on the inner surface of natural paper, it is preferable that the barrier coating layer has thermal adhesive properties. When the barrier coating layer is provided on the outer surface of natural paper, the barrier coating layer preferably has printability. As a barrier coating layer having biodegradability, thermal adhesiveness, and printability, for example, Shield Plus (registered trademark) manufactured by Nippon Paper Industries Co., Ltd. can be mentioned.

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

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

It is preferable that either one or both of the first base material 91 and the second base material 92 have an uneven portion (not shown). Since the amount of air inside the gas cell 10, which will be described later, increases, the buffering effect and heat retention effect are enhanced. The uneven portion is, for example, embossing. Moreover, as a base material having a textured portion, for example, Pearl Soft (registered trademark) can be mentioned.

Both the first base material 91 and the second base material 92 may be synthetic resin films. Since there is a wide variety of base materials, it can meet a variety of needs. Moreover, it is preferable that either one or both of the first base material 91 and the second base material 92 is a multilayer coextruded film. Can provide barrier properties.

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 completely degradable bag. Preferably, one or both sides of the natural paper 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, the surface of the natural paper has pores or irregularities caused by the entanglement of fibers, so the melted or softened thermoplastic resin impregnates the surface of the natural paper or the pores or irregularities of the nonwoven fabric by capillary action. As a result, the two are more firmly bonded at each of the thermally bonded parts H1 to H13, which will be described later. In this way, the adhesive strength is improved, so they are compatible. In this specification, "impregnation" refers to a technique in which a thermoplastic resin material melted or softened by heat is press-fitted into a non-resin material and hardened to fill the gap between the resin material and the non-resin material. That is, in this embodiment, heat is applied to a resin material (e.g., thermoplastic resin) to melt or soften it, impregnate it into a non-resin material (e.g., natural paper), and heat-seal it, but not to form molecular bonds. . Conventionally, heat sealing has generally used thermal adhesion between materials that melt or soften, but in the present invention, a material that does not melt or soften with heat is impregnated with a material that melts or softens with heat. They differ in that they are heat sealed. The thermoplastic resin constituting the thermoplastic resin film preferably impregnates the natural paper in the thickness direction from 20 to 100%, more preferably from 50 to 90%. Further, the thermoplastic resin constituting the thermoplastic resin film may be impregnated with more than 100% in the thickness direction of the natural paper. Here, "impregnation exceeding 100%" means that the thermoplastic resin constituting the thermoplastic resin film permeates to the outer surface of the natural paper.

As shown in FIG. 1, the compartment seal portion 7 is provided in a region facing the storage portion S1. Here, the area facing the accommodating part S1 is an area closer to the folded part 4 than the fitting tool 8. It is preferable that the compartment seal portion 7 is provided on both the front and back surfaces of the buffer bag 1. As shown in FIG. 3, the compartment seal part 7 has a thermally bonded part H1 between the inner surface of the first base material 91 and the outer surface of the second base material 92. The thermal bonding 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 together by heat. In the thermal bonding part H1, at least one of the first base material 91 and the second base material 92 is melted or softened by heat and is fixed (fused) to the other, or the first base material 91 and the second base material 92 are Both of the two base materials 92 may be melted or softened and adhered (fused) to each other. In this way, in the buffer bag 1 according to the present embodiment, the first base material 91 and the second base material 92 are not bonded together by laminating or the like, and the first base material 91 and the second base material 92 are For example, it is directly fixed in the compartment seal portion 7 by thermal adhesion. As a result, the contents can be protected from external pressure without laminating. Further, since a regular pattern such as a grid pattern is formed on the outer surface of the bag by the compartment seal portion 7, an aesthetic appearance can be achieved.

As shown in FIGS. 1 and 3, the gas cell 10 is a sealed space surrounded by the compartment seal 7, and an air layer is formed therein. In this specification, the phrase "each of the gas cells seals the buffer air" means that the buffer air does not enter or exit between adjacent gas cells. The air layer in the gas cell 10 provides impact resistance. In addition, the air layer provides excellent heat insulation. Therefore, it is suitable as a take-out container for frozen foods or warmed lunch boxes.

The buffer air sealed in the gas cell 10 is either air that is naturally contained within the gas cell 10 when the compartment seal 7 is formed, or air that is intentionally contained within the gas cell 10 when the compartment seal 7 is formed. It may also be air that is blown in.

In the buffer bag 1 according to the present embodiment, as shown in FIGS. 1 and 5, the first base material 91 and the second base material 92 are connected to a joint seal provided on the side of the folded part 4 rather than the fitting tool 8. It is preferable that the joint seal part 9 has a thermally bonded part H6 between the inner surface of the first base material 91 and the outer surface of the second base material 92. It is preferable that the joint seal portion 9 is provided along the fitting tool 8 as shown in FIG. The joint seal portion 9 may have a continuous linear shape as shown in FIG. 1, or may have an interrupted linear shape (not shown). Among these, it is more preferable that the joint seal portion 9 has a continuous linear shape as shown in FIG. 1 in that the space between the first base material 91 and the second base material 92 is closed. In addition, since the bonding seal portion 9 has a continuous linear shape as shown in FIG. air can be sealed. Similar to the heat bonding portion H1, the heat bonding portion H6 is not bonded together by laminating or the like, and the first base material 91 and the second base material 92 are directly fixed by thermal bonding. Since the number of bonded parts between the first base material 91 and the second base material 92 increases due to the thermal bonding portion H6, misalignment 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. Although FIG. 1 shows an example in which the partition seal portions 7 are arranged in a grid pattern, the present invention is not limited thereto. The compartment seal portion 7 may have, for example, a diagonal grid shape as shown in FIG. 6(a), a circular shape as shown in FIG. 6(b), or a horizontal line shape as shown in FIG. 6(c). It may be a form having a lattice shape of various sizes as shown in FIG. 6(d). When the partition seal part 7 is circular as shown in FIG. 6(b) and the joint seal part 9 is continuous linear as shown in FIG. 1, in addition to the space 10a inside the circle, Similarly to the gas cell 10, the space 10b can also be sealed with buffer air. As shown in FIG. 6(c), when manufacturing the buffer bag 1, by providing the compartment seal part 7 parallel to the flow direction (also called MD direction) of the base material, air can be sent into the gas cell 10 on the manufacturing line. Cheap. In addition, as shown in FIG. 6(d), by changing the density of forming the compartment seal portion 7, the gas cells 10 can be divided into small gas cells 10c that contain a relatively small amount of air and small gas cells 10c that contain a relatively small amount of air. It is also possible to have a relatively large number of air cells 10d. Thereby, the amount of air in the gas cell 10 can be set more or less, and the degree of buffering and heat retention can be adjusted.

It is preferable that the buffer bag 1 according to this embodiment has a fitting tool 8. The fitting tool 8 allows the housing portion S1 to be resealed. The buffer bag 1 according to the present embodiment has a form (first example) in which the fitting tool 8 is provided on the second base material 92 (i.e., the trunk of the inner bag 3) as shown in FIG. As shown, the embodiment includes a form (second example) in which the fitting tool 8 is provided on the first base material 91 (that is, the trunk of the outer bag 2). Next, a first example of the buffer bag 1 will be explained.

In the buffer bag 1 of the first example according to the present embodiment, as shown in FIGS. 1 and 2, the buffer bag 1 has a first base material 91 and a second base material 92 stacked on top of each other. A folded part 4 that is folded in half with the material 92 facing inside, an opening 5 provided at the edge facing the folded part 4, and a first side edge connecting the folded part 4 and the edge facing the folded part 4. The second base material 92 has a sealing part 6A and a second side edge sealing part 6B opposite to the first side edge sealing part 6A, and the second base material 92 is provided on the inner surface along the edge of the opening 5. As shown in FIG. Along the thickness direction T, a thermally bonded part H2 between the inner surface of the first base material 91 and the outer surface of the second base material 92, a thermally bonded part H3 between the inner surfaces of the second base material 92, It has a thermal bonding part 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 thermally bonded 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 part where the base of the fixture 8 is provided and the edge of the opening 5. is preferred.

In the buffer bag 1 of the first example, as shown in FIG. It has a male member 8B protruding from the other side of the base material 92. The female member 8A and the male member 8B may have any shape as long as they can be releasably engaged with each other. In FIG. Although the cross-sectional shape of the member 8A into which the head part is fitted is concave, and hooks facing each other are provided at both ends of the concave cross-sectional shape, the present invention is not limited to this. The fitting tool 8 may be integrated with the second base material 92 as shown in FIG. 2, or may be a separate body (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 that constitute the edges of the opening are at the same height. However, the present invention is not limited to this, and may include a configuration in which the edges of the two first base materials 91 protrude beyond the edges of the two second base materials 92 to the side opposite to the folded portion 4 (not shown); The edges of the two second base materials 92 protrude beyond the edges of the two first base materials 91 on the side opposite to the folded portion 4 (not shown), or 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 more from the side opposite to the folded portion 4 (not shown) good.

As shown in FIG. 4, the first side edge sealing portion 6A and the second side edge sealing portion 6B are arranged along the thickness direction T of the first base material 91 and the second base material 92 to form a thermal bonding portion H2. , H3, H4. In this specification, "along the thickness direction T of the first base material 91 and the second base material 92" refers to a virtual parallel line extending in the thickness direction T of the first base material 91 and the second base material 92. This means that they are lined up in a straight line (not shown). Although FIG. 3 shows the first side edge sealing part 6A as a representative, the second side edge sealing part 6B also has the same structure as the first side edge sealing part 6A. The thermally bonded parts H2 to H4, like the thermally bonded part H1, are not bonded together by laminating 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 section 6A and the second side edge sealing section 6B by the thermal bonding sections H2 to H4.

As shown in FIG. It is preferable to have a thermally bonded portion H5 between the inner surface of the second base material 92 and the outer surface of the second base material 92. As shown in FIG. 5, the part where the base of the fitting tool 8 is provided is the part closest to the folded part 4 (shown in FIG. 2) among the parts where the female member 8A protrudes from the second base material 92. It is. The thermally bonded portion H5, like the thermally bonded portion H1, is not bonded together by lamination or the like, and the first base material 91 and the second base material 92 are directly fixed by thermal adhesion. 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 modification of the buffer bag according to the present embodiment. FIG. 8 is a sectional view taken along line CC in FIG. In the buffer bag 1 according to the present embodiment, the folded part 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 base material 92 and the outer surface of the second base material 92, a thermally bonded portion H8 between the inner surfaces of the second base material 92, and an outer surface of the second base material 92 and the first base material 91. It is preferable to have a thermally bonded part H9 on the inner surface of the inner surface. The thermally bonded parts H7 to H9 are not bonded together by laminating or the like like the thermally bonded part H1, and the first base material 91 and the second base material 92 are directly fixed by thermal bonding. There is. The thermal bonding parts H7 to H9 can prevent the second base material 92 from rising inward of the bag at the folded part 4.

FIG. 9 is a front view showing an example of a buffer bag having an opening sealing part. FIG. 10 is a sectional view taken along the line DD in FIG. 9. In the buffer bag 1 according to the present embodiment, as shown in FIGS. 9 and 10, the buffer bag 1 has an opening sealing part 11 that seals the edge of the opening 5, and a first side edge seal. Either one or both of the sealing part 6A and the second side edge sealing part 6B has an opening notch 12 in the area between the opening sealing part 11 and the fitting tool 8, and the opening sealing part 11 Along the thickness direction T of the first base material 91 and the second base material 92, there is a thermally bonded portion H10 between the inner surface of the first base material 91 and the outer surface of the second base material 92, and the second base material 92. It is preferable to have a thermally bonded portion H11 between the inner surfaces of the material 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 a damage process such as a scratch process (not shown). Further, the notch 12 may be provided only in the first side edge sealing part 6A as shown in FIG. 7, or may be provided only in the second side edge sealing part 6B (not shown). ) may be provided in both the first side edge sealing part 6A and the second side edge sealing part 6B (not shown). In the buffer bag 1 shown in FIGS. 9 and 10, when the buffer bag 1 is cut open from the notch 12 along the fitting tool 8, an opening 5 is formed as shown in FIG. 2, for example. The thermally bonded parts H10 to H12 are not bonded together by laminating or the like like the thermally bonded part H1, 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 part 11, the unopened state of the buffer bag 1 can be ensured. Although FIG. 10 shows a form in which the folded portion 4 is not provided with a thermally bonded portion, it may be provided with thermally bonded portions H7 to H9 as shown in FIG.

Next, a second example of the buffer bag 1 will be described with reference to FIG. is the same as the buffer bag 1 of the first example. Therefore, the explanation of the common configurations will be omitted, and the different configurations will be explained. In the second example of the buffer bag 1 according to the present embodiment, as shown in FIG. A folded part 4 that is turned inward and folded in half, an opening 5 provided at an edge facing the folded part 4, and a first side edge sealing part that connects the folded part 4 and the edge facing the folded part 4. 6A and a second side edge sealing portion 6B opposite to the first side edge sealing portion 6A, the edges of the two first base materials 91 constituting the edge of the opening 5 are connected to the two second side edge sealing portions 6A. The first base material 91 is arranged so as 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 so as to protrude from the edge of the second base material 92 along the edge of the opening 5. As shown in FIG. 4, the first side edge sealing part 6A and the second side edge sealing part 6B have a male and female interlocking type fitting tool 8 provided on the inner surface. Along the thickness direction T of the second base material 92, there is 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, and a heat bond between the inner surfaces of the second base material 92. It is preferable to have an adhesive part H3 and a thermally adhesive part H4 between the outer surface of the second base material 92 and the inner surface of the first base material 91.

In the second example of the buffer bag 1, the edges of the two first base materials 91 constituting the edges of the opening 5 are arranged so as to protrude beyond the edges of the two second base materials 92 on the side opposite to the folded portion 4. A fitting tool 8 is provided on the inner surface of the protruding portion of the first base material 91. The buffer bag 1 of the second example preferably has a thermally bonded portion H13 between the edge of the second base material 92 and the first base material 91. The thermal bonding portion H13 can prevent contents from entering between the first base material 91 and the second base material 92.

The method for manufacturing the buffer bag 1 according to the present embodiment is not particularly limited, but may be manufactured by the following method, for example. Here, the manufacturing method will be explained by taking the first example of the buffer bag 1 shown in FIGS. 1 to 5 as an example, but the second example of the buffer bag 1 can also be manufactured by the same method.

First, a strip-shaped first base material 91 and a strip-shaped second base material 92 are folded in two so that the second base material 92 is on the inside. The strip-shaped first base material 91 and the strip-shaped second base material 92 may be fed by being unwound from respective raw material rolls wound into rolls. Moreover, it is preferable that the fitting tool 8 is integrally molded 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 tool 8 can be molded integrally with the second base material 92.

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

Thereafter, the compartment seal portion 7 is thermally bonded to the area facing the housing portion using a seal bar or a mold having a predetermined shape. At this time, when forming the compartment seal part 7, suction is applied to the part of the first base material 91 surrounded by the division seal part 7, or an air flow is generated from the raw roll side of the first base material 91 and the second base material 92. You may also do so. These allow the amount of buffering air included in the gas cell 10 to be increased.

The joining seal portion 9 may be formed before forming the side edge sealing portions 6A, 6B, after forming the side edge sealing portions 6A, 6B, or simultaneously when forming the partition seal portion 7. You may.

When the first base material 91 is natural paper and the second base material 92 is a thermoplastic resin film, when providing the heat bonding parts H1 to H13, one side of the part to be heat bonded (the upper side during bag making) ), but depending on the thickness of the first base material 91 (natural paper), seal bars may be applied simultaneously to both sides of the part to be thermally bonded (upper and lower sides during bag making). Alternatively, after heating with a seal bar from one side of the part to be thermally bonded (upper side during bag making), it may be heated with a seal bar from the other side (lower side during bag making). . Thereby, the natural paper of the first base material 91 can be more stably impregnated with the thermoplastic resin of the second base material 92.

1 Buffer bag 2 Outer bag 3 Inner bag 4 Folded portion 5 Opening portion 6A First side edge sealing portion 6B Second side edge sealing portion 7 Compartment seal portion 8 Fitting tool 8A Female member 8B Male member 9 Joint seal portion 10 Gas cell 10a Space in the circle 10b Space outside the circle 10c Small gas cell 10d Atmospheric cell 11 Opening sealing part 12 Notch 91 First base material 92 Second base materials H1 to H13 Thermal bonding part R Region S1 Accommodation part S2 Space T Thickness direction

Claims (6)

A buffer bag that is a double bag comprising an outer bag having a body made of a first base material and an inner bag having a body made of a second base material and disposed inside the outer bag,
The buffer bag includes a storage part provided inside the inner bag, a region facing the storage part , and an inner part of the first base material that constitutes the body of the outer bag. a compartment sealing portion having a thermally bonded portion between the surface and the outer surface of a portion of the second base material that constitutes the trunk of the inner bag ;
The compartment seal portion forms a plurality of gas cells between the first base material and the second base material, each of the gas cells sealing buffer air,
The buffer air does not enter or exit between the adjacent gas cells,
The buffer bag is characterized in that the gas cells include small gas cells that contain a relatively small amount of air and air cells that contain a relatively large amount of air. The buffer bag is provided with a folded part where the first base material and the second base material are overlapped and folded in half with the second base material facing inside, and an edge opposite to the folded part. a first side edge sealing portion that connects the folded portion and an edge facing the folded portion; and a second side edge sealing portion opposite to the first side edge sealing portion. death,
The second base material has a male and female interlocking fitting provided on the inner surface along the edge of the opening,
The first side edge sealing part and the second side edge sealing part are arranged to connect the inner surface of the first base material and the second base material along the thickness direction of the first base material and the second base material. A thermally bonded portion between the outer surface of the base material, a thermally bonded portion between the inner surfaces of the second base material, and a thermally bonded portion between the outer surface of the second base material and the inner surface of the first base material. , has
The first base material and the second base material have an inner surface of the first base material and the second base material in a region between a portion where the base of the fitting tool is provided and an edge of the opening. The buffer bag according to claim 1, further comprising a thermally bonded portion to the outer surface of the material. The buffer bag is provided with a folded part where the first base material and the second base material are overlapped and folded in half with the second base material facing inside, and an edge opposite to the folded part. a first side edge sealing portion that connects the folded portion and an edge facing the folded portion; and a second side edge sealing portion opposite to the first side edge sealing portion. death,
The edges of the two first base materials constituting the edges of the opening are arranged so as to protrude more than the edges of the two second base materials on the opposite side of the folded portion,
The first base material has a male and female interlocking type fitting provided on the inner surface of a portion that protrudes beyond the edge of the second base material along the edge of the opening,
The first side edge sealing part and the second side edge sealing part are arranged to connect the inner surface of the first base material and the second base material along the thickness direction of the first base material and the second base material. A thermally bonded portion between the outer surface of the base material, a thermally bonded portion between the inner surfaces of the second base material, 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 claim 1, characterized in that it has the following. The first base material and the second base material are joined to each other by a joining seal part provided on the folded part side of the fitting tool, and the joining seal part is connected to the first base material. The buffer bag according to claim 2 or 3, further comprising a thermally bonded portion between the inner surface and the outer surface of the second base material. The folded portion includes a thermally bonded portion between an inner surface of the first base material and an outer surface of the second base material, and a heat bonded 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. Claims 2 to 4, characterized in that it has a thermally bonded portion between the inner surfaces of the 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. A buffer bag as described in one of the items. The buffer bag has an opening sealing part that seals an edge of the opening, and
Either one or both of the first side edge sealing part and the second side edge sealing part has an opening notch in a region between the opening sealing part and the fitting tool,
The opening sealing portion includes a thermal bonding portion between an inner surface of the first base material and an outer surface of the second base material along the thickness direction of the first base material and the second base material; Claim 2, further comprising a thermally bonded portion between the inner surfaces of the second base material, 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 described in any one of ~5.

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