JP2020192993A - Biodegradable bag body - Google Patents

Abstract

To provide a biodegradable bag body which has a resealable fitting tool using a biodegradable base material and a biodegradable film, without using an adhesive layer which does not have biodegradability.SOLUTION: A biodegradable bag body 1 is a bag body including: a folding part 4 in which a base material 2 is double-folded; an opening part 5; a first side edge sealing part 6A; and a second side edge sealing part 6B. The base material is a porous base material having biodegradability, and has a fitting tool 8 made of biodegradable synthetic resin. A female base part 8A1 and a male base part 8B1 of the fitting tool are fixed to an inner surface of the base material 2 respectively by thermal adhesion parts H1, H2. The first side edge sealing part and the second side edge sealing part have a strip-shaped biodegradable film 3 arranged between the inner surfaces of the base material, and has a thermal adhesion part H3 between the inner surface of the base material and the biodegradable film and a thermal adhesion part H4 between the biodegradable film and the inner surface of the base material along the thickness direction T of the base material and the biodegradable film.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a biodegradable bag, particularly a biodegradable bag with a resealable fitting.

Various forms have been proposed as a bag body with a chuck (also called a fitting) that can be resealed. For example, a bag body with a synthetic resin fastener that facilitates opening of a plurality of bag portions of different sizes and taking out 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 chuck has been proposed in which an inner bag is further stored inside the outer bag and each bag can be sealed by a chuck provided in each bag (see, for example, Patent Document 3). 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

However, since synthetic resin films are used for all the bags of Patent Documents 1 to 4, these bags are often discarded after use. After being discarded, it is often landfilled, but since the synthetic resin such as polyethylene or polypropylene used for the bag is chemically stable, there is a problem that it remains with almost no decomposition. ..

Therefore, there is a demand for a biodegradable bag with a zipper that decomposes in soil. For example, there is a bag with a zipper that uses a base material in which natural paper and a biodegradable film are laminated. However, in such a bag with a zipper, an adhesive layer has been conventionally used for bonding natural paper and a biodegradable film. Since this adhesive layer does not have biodegradability, there is a problem that only the adhesive layer is not biodegraded and remains in the natural world.

The present disclosure provides a biodegradable bag with a resealable fitting using a biodegradable substrate and a biodegradable film without the use of a non-biodegradable adhesive layer. The purpose is.

The biodegradable bag body according to the present invention has a folded-back portion in which the base material is folded in half, an opening provided at an edge facing the folded-back portion, and the folded-back portion and an edge facing the folded-back portion. A bag body having a first side edge sealing portion to be tied and a second side edge sealing portion facing the first side edge sealing portion, and the base material is a biodegradable porous group. A female that is a material and has a biodegradable synthetic resin fitting provided on the inner surface along the edge of the opening, and the fitting has a female base and a female hook claw. A mold tape and a male tape having a male base portion and a male hook claw portion are provided, and the female base portion and the male base portion are respectively fixed to the inner surface of the base material by a heat-bonding portion, and the first side edge thereof. The sealing portion and the second side edge sealing portion have a strip-shaped biodegradable film arranged between the inner surfaces of the base material, and the thickness of the base material and the biodegradable film. It is characterized by having a heat-bonding portion between the inner surface of the base material and the biodegradable film and a heat-bonding portion between the biodegradable film and the inner surface of the base material along the direction. ..

In the biodegradable bag body according to the present invention, in the first side edge sealing portion and the second side edge sealing portion, the biodegradable film is superposed on the inner surface of the base material and folded in half. The first side edge sealing portion and the second side edge sealing portion are arranged so that the inner surface of the base material and the raw material are arranged along the thickness direction of the base material and the biodegradable film. A heat-bonding portion with the outer surface of the degradable film, a heat-bonding portion between the inner surfaces of the biodegradable film, and a heat-bonding portion between the outer surface of the biodegradable film and the inner surface of the base material. It is preferable to have. It becomes easier to more reliably arrange the biodegradable film up to the folded portion.

In the biodegradable bag body according to the present invention, the biodegradable bag body has an opening sealing portion that seals the edge of the opening, and the first side edge sealing portion or the second edge sealing portion. One or both of the side edge sealing portions have a notch for opening in the region between the opening sealing portion and the fitting, and the opening sealing portion is the inner surface of the base material. It has a strip-shaped biodegradable film arranged between them, and the heat between the inner surface of the base material and the biodegradable film along the thickness direction of the base material and the biodegradable film. It is preferable to have an adhesive portion and a thermal adhesive portion between the biodegradable film and the inner surface of the base material. The unopened state can be ensured by the opening sealing portion.

In the biodegradable bag body according to the present invention, the edge of the opening has a non-adhesive portion in which the inner surfaces of the base materials are in a non-adhesive state, and constitutes the edge of the opening. It is preferable that one of the edges of the base material is arranged so as to project from the other edge on the side opposite to the folded portion. The opening can be opened more easily.

In the biodegradable bag body according to the present invention, it is preferable that one side or both sides of the base material has a barrier coating layer. It is possible to further suppress the deterioration of the quality of the contents.

In the biodegradable bag body according to the present invention, the base material includes a form of natural paper, biodegradable non-woven fabric or biodegradable woven fabric.

According to the present disclosure, a biodegradable bag body with a resealable fitting using a biodegradable base material and a biodegradable film without using a non-biodegradable adhesive layer is provided. Can be provided.

It is a front view which shows an example of the biodegradable bag body which concerns on this embodiment. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is an example of the sectional view taken along line BB of FIG. This is another example of the sectional view taken along line BB in FIG. It is a front view which shows an example of the biodegradable bag body which has an opening sealing part. FIG. 5 is a cross-sectional view taken along the line CC of FIG. It is a partially enlarged sectional view which shows the deformation example of the edge of an opening.

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.

FIG. 1 is a front view showing a first example of a biodegradable bag body 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 and 2, the biodegradable bag body 1 according to the present embodiment has a folded-back portion 4 in which the base material 2 is folded in half, and an opening 5 provided on an edge facing the folded-back portion 4. A bag body having a first side edge sealing portion 6A connecting the folded portion 4 and an edge facing the folded portion 4 and a second side edge sealing portion 6B facing the first side edge sealing portion 6A. The base material 2 is a biodegradable porous base material, and has a fitting 8 made of biodegradable synthetic resin provided on the inner surface along the edge of the opening 5. The fitting 8 is provided with a female tape 8A having a female base 8A1 and a female hook claw 8A2, and a male tape 8B having a male base 8B1 and a male hook claw 8B2, and includes a female base 8A1 and a male base. 8B1 is fixed to the inner surface of the base material 2 by heat-bonding portions H1 and H2, respectively, and the first side edge sealing portion 6A and the second side edge sealing portion 6B are base materials as shown in FIG. It has a strip-shaped biodegradable film 3 arranged between the inner surfaces of 2 and biodegrades with the inner surface of the base material 2 along the thickness direction T of the base material 2 and the biodegradable film 3. It has a heat-bonding portion H3 with the sex film 3 and a heat-bonding portion H4 between the biodegradable film 3 and the inner surface of the base material 2.

As shown in FIG. 1, the biodegradable bag body 1 is preferably a square bag body when viewed from the front, with a folded portion 4 on the lower edge and a first side edge sealing portion 6A on each of the left and right side edges. A single bag having a second side edge sealing portion 6B and an opening 5 on the upper edge. As shown in FIG. 2, the biodegradable bag body 1 has a space S1 between the inner surfaces of the base materials 2. The space S1 is a space that serves as an accommodating portion that communicates with the opening 5, and the opening 5 can be resealed by the fitting 8. The outer surface of the biodegradable bag 1 is covered with a base material 2 such as natural paper, a biodegradable non-woven fabric, or a biodegradable woven fabric, and has a light-shielding property. Therefore, a packaging bag for tea, coffee, tea, etc. Is suitable as. In addition, the biodegradable bag 1 can be used as a packaging bag for sweets, rice, natural foods, etc. by utilizing the natural texture of the base material 2 such as natural paper, biodegradable non-woven fabric, or biodegradable woven fabric. Is also suitable.

The base material 2 is a porous base material having biodegradability. The porous base material is a base material having pores or irregularities generated by entanglement of fibers and the like constituting the base material on the surface of the base material. The base material 2 is preferably in the form of a sheet, a film, or a plate. In this embodiment, the porous substrate includes a form of natural paper, biodegradable non-woven fabric or biodegradable woven fabric.

The natural paper is not particularly limited as long as it is biodegradable, and may be Japanese paper or Western paper, and is, for example, kraft paper or paraffin paper (waxed paper).

The biodegradable non-woven fabric is a non-woven fabric made from biodegradable plastic. The biodegradable plastic 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.

A biodegradable woven fabric is a woven fabric made by weaving biodegradable fibers. Biodegradable fibers are, for example, natural fibers such as cotton, silk, hemp, mohair, wool or cashmere, regenerated fibers such as acetate, cupra or rayon, or a combination of two or more of these.

In the biodegradable bag 1 according to the present embodiment, it is preferable that one side or both sides of the base material 2 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 base material 2, is provided only on the outer surface of the base material 2, or is provided on both the inner surface and the outer surface of the base material 2. May be good. The barrier coating layer is preferably biodegradable. Further, when the barrier coating layer is provided on the inner surface of the base material 2, the barrier coating layer preferably has thermal adhesiveness. When the barrier coating layer is provided on the outer surface of the base material 2, 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.

The biodegradable film 3 is not particularly limited as long as it is a film made of biodegradable plastic, 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 shape of the biodegradable film 3 is strip-shaped. In the present specification, the strip shape means an elongated shape that matches the shapes of the first side edge sealing portion 6A and the second side edge sealing portion 6B. The size of the biodegradable film 3 is the same as that of the first side edge sealing portion 6A and the second side edge sealing portion 6B, or the first side edge sealing portion 6A and the second side edge sealing portion 6A. It may be larger than the stop portion 6B.

As shown in FIG. 2, the fitting 8 has a female tape 8A fixed to one of the opposing base materials 2 in the opening 5 and a male tape 8B fixed to the other base material 2. The female tape 8A has a female base portion 8A1 which is a portion fixed to the base material 2 and a female claw portion 8A2 which is a portion which engages with the male claw portion 8B2. The male tape 8B has a male base portion 8B1 which is a portion fixed to the base material 2 and a male claw portion 8B2 which is a portion which engages with the female claw portion 8A2. The female claw portion 8A2 and the male claw portion 8B2 may have a shape that engages with each other in a disengaged manner. As an example in FIG. 2, the female claw portion 8A2 has a shape having an arrowhead-shaped head, and the male claw portion 8A2 The portion 8B2 has a concave cross-sectional shape so that the head of the female claw portion 8A2 fits, and the tips of both sides thereof are provided with hooks facing each other, but the present invention is limited thereto. Not done.

The material of the fitting 8 is not particularly limited as long as it is biodegradable, and for example, the biodegradable plastics listed as the material of the biodegradable resin film 3 can be used.

The female base portion 8A1 and the male base portion 8B1 are fixed to the inner surface of the base material 2 by heat-bonding portions H1 and H2, respectively. The heat-bonded portions H1 and H2 are portions where the inner surface of the base material 2 and the female base portion 8A1 or the male base portion 8B1 are heat-bonded. In the heat-bonded portions H1 and H2, the resins of the female base portion 8A1 and the male base portion 8B1 are melted or softened by heat and fixed (fused) to the base material 2. At this time, since the surface of the porous base material 2 has pores or irregularities caused by entanglement of fibers and the like constituting the base material, the biodegradable resin constituting the female base portion 8A1 and the male base portion 8B1 is melted by the capillary phenomenon. By impregnating the pores on the surface of the base material with the substance or softener, the two are more firmly bonded. 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, a resin material (for example, biodegradable resin) is heated to be melted or softened to be in a molten or softened state, and the non-resin material (for example, natural paper, biodegradable non-woven fabric, or biodegradable woven fabric) is porous. The base material) is impregnated and heat-sealed, not molecularly bonded. Conventionally, heat bonding 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 biodegradable resin constituting the female base portion 8A1 and the male base portion 8B1 is preferably impregnated with 20 to 100%, more preferably 50 to 90% in the thickness direction of the base material. Further, the biodegradable resin constituting the female base portion 8A1 and the male base portion 8B1 may be impregnated in an amount of more than 100% in the thickness direction of the base material. Here, impregnation in excess of 100% means that the biodegradable resin constituting the female base portion 8A1 and the male base portion 8B1 stains the surface of the base material opposite to the fitting 8 side, that is, the outer surface of the base material. It means that it penetrates so that it comes out.

In the first side edge sealing portion 6A and the second side edge sealing portion 6B, as shown in FIG. 3, a strip-shaped biodegradable film 3 is arranged between the inner surfaces of the base material 2. Strictly speaking, the biodegradable film 3 is arranged not between the inner surfaces of the base material 2 but between the male and female claws 8A2 and 8B2 in the fitting 8 portion, and the fitting other than the fitting 8 portion. In the portion, it is arranged between the inner surfaces of the base material 2.

As shown in FIG. 3, the first side edge sealing portion 6A and the second side edge sealing portion 6B are formed on the inner surface of the base material 2 along the thickness direction T of the base material 2 and the biodegradable film 3. It has a heat-bonding portion H3 between the biodegradable film 3 and the biodegradable film 3, and a heat-bonding portion H4 between the biodegradable film 3 and the inner surface of the base material 2. In the present specification, "along the thickness direction T of the base material 2 and the biodegradable film 3" means a virtual identical straight line extending in the thickness direction T of the base material 2 and the biodegradable film 3 (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 H3 and H4 are portions where the inner surface of the base material 2 and the biodegradable film 3 are heat-bonded. In the heat-bonding portions H3 and H4, the resin of the biodegradable film 3 is melted or softened by heat and fixed (fused) to the base material 2. At this time, since the surface of the porous base material 2 has pores or irregularities generated by entanglement of fibers and the like constituting the base material, a melt of the biodegradable resin constituting the biodegradable film 3 due to the capillary phenomenon or By impregnating the pores on the surface of the substrate with the softener, the two bond more tightly. The biodegradable resin constituting the biodegradable film 3 is preferably impregnated with 20 to 100%, more preferably 50 to 90% in the thickness direction of the base material. Further, the biodegradable resin constituting the biodegradable film 3 may be impregnated with more than 100% in the thickness direction of the base material. Here, impregnation in excess of 100% means that the biodegradable resin constituting the biodegradable film 3 exudes to the surface of the base material opposite to the biodegradable film side, that is, the outer surface of the base material. It means that it has penetrated into.

As described above, in the biodegradable bag body 1 according to the present embodiment, the base material 2 and the fitting 8 are directly fixed to the female base portion 8A1 and the male base portion 8B1 by heat adhesion, and the base material 2 and the biodegradable film 3 are directly fixed by heat adhesion at the first side edge sealing portion 6A and the second side edge sealing portion 6B. As described above, the biodegradable bag body 1 according to the present embodiment does not use a non-biodegradable material such as an adhesive. As a result, complete biodegradability can be achieved.

FIG. 4 is another example of the cross-sectional view taken along the line BB of FIG. In the biodegradable bag 1 according to the present embodiment, in the first side edge sealing portion 6A and the second side edge sealing portion 6B, the biodegradable film 3 is superposed on the inner surface of the base material 2. The first side edge sealing portion 6A and the second side edge sealing portion 6B are arranged in a fold, and the first side edge sealing portion 6A and the second side edge sealing portion 6B are arranged on the inner surface of the base material 2 along the thickness direction T of the base material 2 and the biodegradable film 3. The heat-bonding portion H5 between the biodegradable film 3 and the outer surface of the biodegradable film 3, the heat-bonding portion H6 between the inner surfaces of the biodegradable film 3, and the outer surface of the biodegradable film 3 and the inner surface of the base material 2 It may have a heat-bonded portion H7. The difference between FIG. 4 and FIG. 3 is that the biodegradable film 3 does not have a folded portion in FIG. 3, whereas the biodegradable film 3 has a folded portion 4a in FIG. Since the biodegradable film 3 has the folded-back portion 4a, the folded portion 4a of the biodegradable film 3 is made to match the folded-back portion 4 of the base material 2 at the time of manufacturing the biodegradable bag body 1, so that the biodegradable film 3 is biodegradable. It becomes easier to arrange the film 3 more reliably up to the folded-back portion 4.

FIG. 5 is a front view showing an example of a biodegradable bag body having an opening sealing portion. FIG. 6 is a cross-sectional view taken along the line CC of FIG. In the biodegradable bag body 1 according to the present embodiment, the biodegradable bag body 1 has an opening sealing portion 11 that seals the edge of the opening 5, and the first side edge sealing portion 6A or One or both of the second side edge sealing portion 6B has a notch 12 for opening in the region between the opening sealing portion 11 and the fitting 8, and the opening sealing portion 11 is a base material. It has a strip-shaped biodegradable film 3 arranged between the inner surfaces of 2 and biodegrades with the inner surface of the base material 2 along the thickness direction T of the base material 2 and the biodegradable film 3. It is preferable to have a heat-bonding portion H8 with the sex film 3 and a heat-bonding portion H9 between the biodegradable film 3 and the inner surface of the base material 2.

The notch 12 is not particularly limited, and may be, for example, a V notch (shown in FIG. 5), an I notch (not shown), or damage processing by scratch processing (not shown). Further, as shown in FIG. 5, the notch 12 may be provided only in the first side edge sealing portion 6A, or may be provided only in the second side edge sealing portion 6B (not shown). ), It may be provided in both the first side edge sealing portion 6A and the second side edge sealing portion 6B (not shown). In the bag body 1 shown in FIGS. 5 and 6, when the bag body 1 is cut open from the notch 12 along the fitting 8, for example, an opening 5 is formed as shown in FIG. Like the heat-bonded parts H1 and H2, the heat-bonded portions H8 and H9 are directly fixed by heat-bonding without interposing an adhesive or the like. By sealing the edge of the opening 5 with the opening sealing portion 11, the unopened state of the bag 1 can be ensured.

FIG. 7 is a partially enlarged cross-sectional view showing a modified example of the edge of the opening. In the biodegradable bag body 1 according to the present embodiment, the edge of the opening 5 has a non-adhesive portion N1 in which the inner surfaces of the base materials 2 are in a non-adhesive state, and the edge of the opening 5 is formed. It is preferable that one of the edges of the two constituent base materials 2 is arranged so as to project from the other edge on the side opposite to the folded-back portion 4. The non-adhesive portion N1 becomes an opening 5 communicating with the space S1. As shown in FIG. 7, by arranging the adjacent edges of the openings 5 with steps, the edges of the openings 5 can be easily displaced by the fingertips, and the openings 5 can be opened more easily.

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

First, a strip-shaped base material 2 opened in the shape of a sheet before bag making is prepared. At this time, the end portion extending in the longitudinal direction of the base material 2 is a portion that becomes an edge of the opening 5 (for example, shown in FIGS. 1 and 2) after bag making, and extends in the longitudinal direction of the base material 2. The central portion between the edges of the openings 5 at both ends is a portion that becomes a folded-back portion 4 (for example, shown in FIGS. 1 and 2) after bag making.

Then, the female tape 8A and the male tape 8B (for example, shown in FIG. 2) constituting the biodegradable synthetic resin fitting 8 are heated along the edge of the opening 5 of the base material 2. The heat-bonded portions H1 and H2 are provided by bonding. Next, the strip-shaped biodegradable film 3 is adhered to the natural paper fitting 8 so that the longitudinal direction of the strip-shaped biodegradable film 3 intersects the longitudinal direction of the strip-shaped base material 2. It is placed on the surface so as to be overlapped at predetermined intervals. At this time, the strip-shaped biodegradable film 3 is arranged from any one of the edges of the opening 5 of the base material 2 to the portion to be the folded-back portion 4, or is arranged over the one opening of the base material 2. It may be arranged from the portion serving as the edge of the portion 5 to the portion serving as the folded portion 4 and extending over the portion serving as the edge of the other opening portion 5.

Next, the base material 2 is folded in half so that the biodegradable film 3 forms the inside in a state where the biodegradable film 3 is superposed on the base material 2. At this time, it is preferable that the base material 2 is folded back together with the biodegradable film 3 while pressing the pressing bar (pressing plate) against the portion to be the folded-back portion 4 and applying tension to the folded-back portion 4.

After that, the side edge sealing portions 6A and 6B (for example, shown in FIG. 12) are formed in the portion where the biodegradable film 3 is arranged. In the step of forming the side edge sealing portions 6A and 6B, as shown in FIG. 3, the inner surface of the base material 2 and the biodegradable film are formed along the thickness direction T of the base material 2 and the biodegradable film 3. It is a step of providing the heat-bonding portion H3 with and the heat-bonding portion H3 between the biodegradable film 3 and the inner surface of the base material 2, or as shown in FIG. 4, the base material 2 and the biodegradable Along the thickness direction T of the film 3, the heat-bonding portion H5 between the inner surface of the base material 2 and the outer surface of the biodegradable film 3, and the heat-bonding portion H6 between the inner surfaces of the biodegradable film 3 It may be a step of providing the heat-bonding portion H7 between the outer surface of the biodegradable film 3 and the inner surface of the base material 2. In providing the heat-bonded portions H1 to H7, 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 according to the thickness of the base material 2. Both sides of the part (upper and lower sides 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 a seal bar from (lower side at the time of bag making). As a result, the base material can be impregnated with the biodegradable resin more stably.

1 Biodegradable bag body 2 Base material 3 Biodegradable film 4 Folded part 4a Folded part 5 Opening 6 Side edge sealing part 6A 1st side edge sealing part 6B 2nd side edge sealing part 8 Fitting tool 8A Female tape 8A1 Female base 8A2 Female hook claw 8B Male tape 8B1 Male base 8B2 Male hook 11 Opening seal 12 Notch H1, H2, H3, H4, H5, H6, H7, H8. H9 Thermal adhesive part N1 Non-adhesive part S1 Space T Thickness direction

Claims (6)

A folded portion in which the base material is folded in half, an opening provided at an edge facing the folded portion, a first side edge sealing portion connecting the folded portion and an edge facing the folded portion, and the said. A bag body having a second side edge sealing portion facing the first side edge sealing portion.
The base material is a biodegradable porous base material, and has a fitting made of biodegradable synthetic resin provided on the inner surface along the edge of the opening.
The fitting includes a female tape having a female base portion and a female claw portion, and a male tape having a male base portion and a male claw portion, and the female base portion and the male base portion are each inside the base material. It is fixed to the surface by a heat-bonded part,
The first side edge sealing portion and the second side edge sealing portion have a strip-shaped biodegradable film arranged between the inner surfaces of the base material, and the base material and the biodegradable portion. Along the thickness direction of the sex film, it has a heat-bonding portion between the inner surface of the base material and the biodegradable film, and a heat-bonding portion between the biodegradable film and the inner surface of the base material. A biodegradable film body characterized by that. In the first side edge sealing portion and the second side edge sealing portion, the biodegradable film is overlapped with the inner surface of the base material and arranged in half.
The first side edge sealing portion and the second side edge sealing portion are formed on the inner surface of the base material and the outside of the biodegradable film along the thickness direction of the base material and the biodegradable film. It is characterized by having a heat-bonding portion with a surface, a heat-bonding portion between the inner surfaces of the biodegradable film, and a heat-bonding portion between the outer surface of the biodegradable film and the inner surface of the base material. The biodegradable bag according to claim 1. The biodegradable bag has an opening sealing portion that seals the edge of the opening, and has an opening sealing portion.
Either one or both of the first side edge sealing portion and the second side edge sealing portion has a notch for opening in the region between the opening sealing portion and the fitting.
The opening sealing portion has a strip-shaped biodegradable film arranged between the inner surfaces of the base material, and the base material and the base material along the thickness direction of the biodegradable film. The invention according to claim 1 or 2, wherein the material has a heat-bonding portion between the inner surface of the material and the biodegradable film, and a heat-bonding portion between the biodegradable film and the inner surface of the base material. Biodegradable film body. The edge of the opening has a non-adhesive portion in which the inner surfaces of the base materials are in a non-adhesive state, and
Claim 1 is characterized in that one of the edges of the two base materials constituting the edge of the opening is arranged so as to project from the other edge to the side opposite to the folded portion. Or the biodegradable bag according to 2. The biodegradable bag according to any one of claims 1 to 4, wherein one side or both sides of the base material has a barrier coating layer. The biodegradable bag according to any one of claims 1 to 5, wherein the base material is natural paper, a biodegradable non-woven fabric, or a biodegradable woven fabric.

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