Heat-seal paper bag with fitting tool

Abstract

To provide a heat-seal paper bag with a fitting tool that can secure the fitting tool to a bag body firmly while dramatically reducing the petroleum content compared to a conventional bag body with a fitting tool that uses laminated sheets made by pasting a synthetic resin film onto a paper base material.SOLUTION: A heat-seal paper bag with a fitting tool 1 includes a bag body 10 and a fitting tool 20. The bag body 10 has a storage part 11, an opening edge part 12, and sealing edge parts 13 (13a, 13b, 13c), where heat-seal sheets 4 are arranged facing each other with inner heat-seal layers 3 on the inside. The fitting tool 20 is made of a thermoplastic resin. The fitting tool 20 has a male member 21 and a female member 26 that interlock with each other. The male member 21 and female member 26 each have base parts 22, 27, and biting parts 23, 28. The edges 22a, 27a on the side of the opening edge part 12 of the base parts are covered and fixed with a covering part 30.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a heat sealable paper bag with fittings. [Background technology]

[0002] Conventionally, when forming packaging bags using a paper base material, a laminated sheet in which a synthetic resin film is laminated to the paper base material has been used (see, for example, Patent Document 1). In Patent Document 1, the laminated sheet is designed so that the thickness of the synthetic resin film is equal to that of the paper base material in order to ensure durability and barrier properties. However, as represented by the SDGs, the entire industry is conscious of considering the global environment, and non-petroleum materials such as paper are attracting more attention than synthetic resins.

[0003] The applicant has proposed a zippered bag in which a zipper is attached to a paper bag (see, for example, Patent Document 2, especially claim 8, paragraphs

[0041] and

[0042] ). In addition, as a packaging bag that has a small environmental impact and can be resealed, a paper zippered bag has been proposed in which a heat seal layer is formed on the surface of a paper base material by applying a heat seal agent, and the heat seal layers are thermally bonded together to form a bag shape, with a zipper tape heat sealed to the heat seal layer (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-45116 A [Patent Document 2] JP 2012-165863 A [Patent Document 3] Utility Model Registration No. 3240525 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 2, it is described that when paper is used as the material of the bag, the heat sealing method cannot be adopted as a method for adhering the zipper tape, and an adhesive or a pressure-sensitive adhesive is used. By adhering the zipper tape to paper using an adhesive or a pressure-sensitive adhesive, the zipper tape can be firmly adhered to the paper bag, but from the viewpoint of production efficiency, it is preferable to adhere the zipper tape by the heat sealing method. In Patent Document 3, the zipper tape is adhered to the heat seal layer by the heat sealing method. However, since the heat seal layer is thin, the adhesive strength between the zipper tape and the heat seal layer cannot be sufficiently ensured, and there is a risk that the zipper tape will peel off when a load is applied to the heat-adhered part between the zipper tape and the heat seal layer due to opening and closing of the zipper.

[0006] The objective of the present disclosure is to provide a heat-sealed paper bag with a fastening device that can firmly fix the fastening device to the bag body while dramatically reducing the mineralization rate compared to conventional bags with fastening devices that use a laminated sheet in which a synthetic resin film is bonded to a paper base material. [Means for solving the problem]

[0007] The heat-sealed paper bag with a fitting according to the present invention is composed of heat-sealed paper having at least a paper base material and an inner heat-sealed layer provided on one surface of the paper base material, the heat-sealed papers being arranged facing each other with the inner heat-sealed layer on the inside, and the heat-sealed paper bag with a fitting comprises a bag body having a storage section, an opening edge portion communicating with the storage section, and a sealing edge portion where the inner heat-sealed layers are thermally bonded to each other at the periphery of the storage section, and a fitting made of thermoplastic resin fixed to the inner heat-sealed layer along the opening edge portion, wherein the fitting has male and female members that engage with each other, the male and female members each having a base portion fixed to the inner heat-sealed layer and a fitting portion standing up from the base, and the edge portion of the base on the opening edge side is covered and fixed with a covering portion.

[0008] In the heat-sealable paper bag with fitting according to the present invention, the bag body preferably has a folded-back piece that folds the heat-sealable paper back into the bag body at the opening edge to cover the edge of the base on the opening edge side, and the covering piece preferably has a thermally bonded part between the base and the inner heat-sealed layer of the folded-back piece. This makes it possible to prevent the fitting from peeling off from the bag body when the fitting is released without using a separate member.

[0009] In the heat-sealed paper bag with fitting according to the present invention, the sealing edge has a bottom edge facing the opening edge, and a left edge and a right edge connecting the facing ends of the opening edge and the bottom edge, and the bag body preferably has free parts in the areas of the left edge and the right edge closer to the opening edge than the fitting, which make the opposing folded-back pieces non-adhered to each other. By providing the free parts, the heat-sealed papers can be easily moved apart at the opening edge, so that the fitting can be opened with less force.

[0010] In the heat-sealable paper bag with fitting according to the present invention, it is preferable that the heat-sealable paper has a non-adhesive area along the leading edge of the folded piece where the inner heat-sealed layer is not provided. By providing the non-adhesive area, it is possible to prevent a resin puddle caused by the resin of the heat-sealed layer extruded during the formation of the covering part from being formed on the fitting.

[0011] In the heat-sealed paper bag with fitting of the present invention, the bag body has a first heat-seal tape covering the edge of the base on the opening edge side, and the covering portion includes a form having a thermally bonded portion between the base and the first heat-seal tape.

[0012] In the heat-sealable paper bag with a fitting according to the present invention, the bag body preferably has a second heat-seal tape covering the edge of the base on the opposite side to the opening edge side, and the second heat-seal tape is thermally bonded to the base, which can prevent the fitting from peeling off from the bag body due to the internal pressure of the bag.

[0013] In the heat-sealable paper bag with fitting according to the present invention, the bag body preferably has an opening sealing portion formed by thermally bonding the opposing inner heat-seal layers to each other, on the opening edge side of the bag body relative to the fitting. The bag can be stored in a sealed state. Effect of the Invention

[0014] According to the present disclosure, it is possible to provide a heat-sealed paper bag with a fastening device that can firmly fix the fastening device to the bag body while dramatically reducing the mineralization rate compared to conventional bags with fastening devices that use a laminated sheet in which a synthetic resin film is bonded to a paper base material. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic front view showing a first example of a heat-sealed paper bag with a fitting according to this embodiment. FIG. [Diagram 2] FIG. 2 is a schematic end view of line AA in FIG. [Diagram 3] FIG. 3 is a schematic enlarged partial view of part B in FIG. 2. [Figure 4] FIG. 3 is a schematic enlarged partial view of part C in FIG. 2. [Diagram 5] FIG. 3 is a schematic enlarged partial view of part D in FIG. 2. [Figure 6] FIG. 5 is a schematic partial enlarged view of a portion E in FIG. [Figure 7] FIG. 2 is a schematic end view of the FF line in FIG. 1. [Figure 8] 1 is a schematic front view showing a second example of a heat-sealed paper bag with a fitting according to this embodiment. FIG. [Figure 9] FIG. 9 is a schematic end view of line GG in FIG. 8. [Figure 10] This is a modified example of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Next, the present invention will be described in detail with reference to the embodiments, but the present invention is not limited to these descriptions. Various modifications of the embodiments may be made as long as the effects of the present invention are achieved.

[0017] As shown in FIG. 1, the heat seal paper bag 1 with fitting according to this embodiment is composed of heat seal paper 4 having at least a paper base material 2 (shown in FIG. 3) and an inner heat seal layer 3 (shown in FIG. 3) provided on one surface of the paper base material 2, the heat seal papers 4 are arranged facing each other with the inner heat seal layer 3 on the inside, and the bag body 10 has a storage section 11, an opening edge portion 12 communicating with the storage section 11, and a sealing edge portion 13 (13a, 13b, 13c) in which the inner heat seal layers 3 are thermally bonded to each other at the periphery of the storage section 11; A heat-sealed paper bag with a fitting comprising a fitting 20 made of thermoplastic resin fixed to the inner heat-seal layer 3 along the opening edge 12, the fitting 20 having a male member 21 and a female member 26 that fit together as shown in Figure 2 or Figure 4, the male member 21 and the female member 26 each having a base 22, 27 fixed to the inner heat-seal layer 3 and a fitting portion 23, 28 standing upright from the base 22, 27, and the edges 22a, 27a of the bases 22, 27 on the opening edge 12 side are covered and fixed with a covering portion 30.

[0018] As shown in Fig. 3, the heat seal paper 4 has a paper base material 2 and an inner heat seal layer 3 provided on at least one surface of the paper base material 2. In Fig. 3, the thickness of each element is exaggerated relative to its length and width. The same is true in Figs. 4 to 7, 9 and 10.

[0019] The paper base material 2 is preferably a natural paper made from fibers derived from natural substances, and may be Japanese paper or Western paper, for example, Japanese paper such as tairei paper, or Western paper such as kraft paper or paraffin paper (waxed paper). The paper base material 2 may be a single layer or may be multi-layered. The paper base material 2 is preferably biodegradable. The paper base material 2 may also be an greaseproof paper containing an greaseproofing agent. The greaseproofing agent is not particularly limited, but may be, for example, a fluorine-based resin, an acrylic resin, or a synthetic rubber latex, or a combination thereof.

[0020] The inner heat seal layer 3 may be a coating layer of a resin having heat sealability, or a film of a resin having heat sealability. Of these, the inner heat seal layer 3 is preferably a coating layer of a resin having heat sealability. The coating layer can be formed, for example, by coating a coating liquid containing a resin having heat sealability on a paper substrate and drying it. By making the inner heat seal layer 3 a coating layer of a resin having heat sealability, the mineralization rate can be reduced compared to laminated paper in which a resin film is laminated on paper. The resin having heat sealability is not particularly limited, but is preferably at least one selected from the group consisting of polyethylene and polypropylene. The resin having heat sealability may also be a biodegradable resin. The biodegradable resin is, for example, polylactic acid or polyglycolic acid. The biodegradable resin may also be one containing polycaprolactone, polyhydroxyalkanoate, modified polyvinyl alcohol, casein, or modified starch as a component. In laminated paper, in which a resin film is laminated to ordinary paper, a resin film of approximately the same thickness as the paper base material is laminated to the paper base material to ensure heat sealability. In this embodiment, however, the thickness of the inner heat seal layer is preferably 1 to 20% of the thickness of the paper base material, and more preferably 5 to 10%.

[0021] The heat seal paper 4 may further have other layers in addition to the paper base material 2 and the inner heat seal layer 3. The other layers are, for example, an outer heat seal layer (not shown) provided on the surface of the paper base material 2 opposite to the side on which the inner heat seal layer 3 is provided, or a barrier layer provided on one or both sides of the paper base material 2. The outer heat seal layer has the same basic structure as the inner heat seal layer. By providing the outer heat seal layer, the heat seal paper 4 can be made double-sided sealable. In addition, an example of a heat seal paper having a barrier layer is SHIELDPLUS (registered trademark) manufactured by Nippon Paper Industries Co., Ltd.

[0022] As an example, in Figures 1 and 2, the bag body 10 is shown in a form in which two sheets of heat seal paper 4 are overlapped with the inner heat seal layers 3 facing each other, and the inner heat seal layers 3 are heat-bonded to each other at the peripheral portions other than the opening edge portion 12 to form a sealed edge portion 13 (13a, 13b, 13c) to form a bag shape. However, the present invention is not limited to this, and for example, a sheet of heat seal paper 4 may be folded in half with the inner heat seal layer 3 on the inside, and the inner heat seal layers 3 may be overlapped with each other facing each other, and the bag shape may be formed by heat-bonding the inner heat seal layers 3 to each other at the peripheral portions other than the opening edge portion 12 to form a sealed edge portion 13 (13a, 13b, 13c) (not shown).

[0023] The opening edge 12 is an opening for taking out the contents, and can be resealed by a fitting 20 described later. As shown in FIG. 4, the opening edge 12 may have heat seal papers 4 facing each other not bonded to each other. When the bag body 10 is, for example, substantially rectangular in plan view as shown in FIG. 1, the sealing edge 13 has a bottom edge 13a facing the opening edge 12, and a left edge 13b and a right edge 13c connecting the facing ends of the opening edge 12 and the bottom edge 13a. As shown in FIG. 5, the sealing edge 13 (13a, 13b, 13c) has a thermally bonded part H1 between the facing inner heat seal layers 3. Although the bottom edge 13a is illustrated in FIG. 5, the left edge 13b and the right edge 13c have the same configuration.

[0024] As shown in Figs. 1 and 2, the storage section 11 is an internal space of the bag body 10 that communicates with the opening edge section 12, and is a space for storing the contents.

[0025] As shown in Fig. 4, the fitting 20 has a male member 21 and a female member 26. The male member 21 has a male base 22 and a male mating portion 23. The female member 26 has a female base 27 and a female mating portion 28. As shown in Fig. 2, the male base 22 is heat-sealed to one of the opposing inner heat-seal layers 3 along the edge of the opening edge 12, and the female base 27 is heat-sealed to the other of the opposing inner heat-seal layers 3 along the edge of the opening edge 12. The male mating portion 23 and the female mating portion 28 fit together in a freely disengageable manner. The male mating portion 23 and the female mating portion 28 may have any shape so long as they can be detachably engaged with each other. As an example, FIG. 2 shows a configuration in which the male mating portion 23 has a cross-sectional shape with an arrowhead-shaped head, and the female mating portion 28 has a concave cross-sectional shape into which the head of the male mating portion 23 fits, with hooks facing each other at the tips on both sides, but the present invention is not limited to this.

[0026] The material of the fitting 20 is not particularly limited as long as it is a thermoplastic resin, and may be, for example, a synthetic resin or a biodegradable resin. The synthetic resin may be, for example, polypropylene (PP) such as homopolymer PP, random copolymer PP, block copolymer PP, or metallocene PP, polyethylene (PE) such as linear low density polyethylene (L-LDPE), metallocene linear low density polyethylene (m-LLDPE), high density polyethylene (HDPE) or low density polyethylene (LDPE), or polyolefin resin such as ethylene vinyl acetate copolymer (EVA), polymethylpentene (PMP), ethylene copolymer (EMA), or olefin thermoplastic elastomer (TPO). The biodegradable resin may be, for example, polylactic acid or polyglycolic acid. The biodegradable resin may also be one containing polycaprolactone, polyhydroxyalkanoate, modified polyvinyl alcohol, casein, or modified starch as a component. The material of the fitting 20 is preferably the same as the material of the inner heat seal layer 3 in terms of increasing the heat seal strength.

[0027] In order to further reduce the mineralization rate, it is preferable that the fitting 20 is a fitting having a reduced amount of resin compared to general fittings. The fitting having a reduced amount of resin is not particularly limited, but for example, it is a narrow-width fitting in which the width of the male base 22 and the female base 27 are narrowed, or the size of the male member 21 and the female member 26 are reduced.

[0028] 4, the covering portion 30 is a portion that covers and fixes the edge 22a on the opening edge 12 side of the male base 22 and the edge 27a on the opening edge 12 side of the female base 27. In the heat sealable paper bag 1 with fitting according to this embodiment, the thickness of the inner heat seal layer 3 is set relatively thin compared to laminated paper in which a resin film is laminated to ordinary paper, and there is a risk that the heat seal strength between the fitting 20 and the inner heat seal layer 3 will be weaker than that of the laminated paper, but the covering portion 30 can prevent the fitting 20 from peeling off.

[0029] The heat-sealed paper bag 1 with a fitting according to this embodiment includes a first example of the heat-sealed paper bag 1 with a fitting having a covering portion 30 having the following configuration. In the first example of the heat-sealed paper bag 1 with a fitting according to this embodiment, the bag body 10 has a folded piece 31 that folds the heat-sealed paper 4 into the bag body 10 at the opening edge 12 to cover the edges 22a, 27a of the bases (male base 22 and female base 27) on the opening edge 12 side as shown in FIG. 4, and the covering portion 30 preferably has a thermally bonded portion H2 between the bases 22, 27 and the inner heat-sealed layer 3 of the folded piece 31. In the covering portion 30, the edges 22a, 27a of the bases 22, 27 on the opening edge 12 side are fixed in a sandwiched state by the heat-sealed paper 4 with the inner heat-sealed layer 3 on the inside, reinforcing the fixing of the bases 22, 27 to the bag body 10. By covering and fixing the bases 22, 27 with the folded pieces 31, it is possible to prevent the fitting 20 from peeling off from the bag body 10 when the fitting 20 is disengaged, without using a separate member. The length of the folded pieces 31 may be any length that can cover the edges 22a, 27a on the opening edge 12 side of the bases 22, 27 and does not come into contact with the fitting parts (male fitting part 23 and female fitting part 28), and is not particularly limited, but is, for example, 2 to 20 mm.

[0030] The method of forming the covering part 30 is not particularly limited, but taking the male member 21 as an example, the covering part 30 can be formed by fixing the male member 21 to the inner heat seal layer 3 by heat sealing along the edge part that will become the opening edge part 12 of the heat seal paper 4 at a predetermined distance from the edge part, and then folding the edge part of the heat seal paper 4 over the male base part 22 and heat sealing it. Alternatively, the edge part that will become the opening edge part 12 of the heat seal paper 4 may be folded back by a predetermined width with the inner heat seal layer 3 on the inside, and the male base part 22 may be inserted into the folded back part and heat sealed, thereby simultaneously fixing the male member 21 to the bag body 10 and forming the covering part 30. The covering part 30 can also be formed for the female member 26 in the same manner as for the male member 21. The heat sealing temperature can be set appropriately depending on the materials of the male member 21, the female member 26, and the inner heat seal layer 3, but for example, when the male member 21, the female member 26, and the inner heat seal layer 3 are made of PE, pseudo-adhesion between the male member 21 and the female member 26 and the inner heat seal layer 3 begins at 150°C, and there is a risk that the male member 21 and the female member 26 will melt at 200°C or higher. Therefore, the heat sealing temperature is preferably more than 150°C and less than 200°C, and more preferably 160°C or higher and 180°C or lower.

[0031] In the first example of the heat seal paper bag 1 with a fitting according to this embodiment, as shown in Figs. 4 and 6, the heat seal paper 1 preferably has a non-adhesive region 32 where the inner heat seal layer 3 is not provided along the leading edge 31a of the fold-back piece 31. In the non-adhesive region 32, the paper base material 2 is exposed on the inside (the storage section 11 side) of the heat seal paper 1. When the fold-back piece 31 is heat-sealed to the bases 22 and 27, the resin of the inner seal layer 3 may be pushed out and protrude from the heat seal paper 4 to form a resin pool. If a resin pool is formed on the fitting 20, there is a risk that the engagement parts 23 and 28 cannot be engaged or disengaged. By providing the non-adhesive region 32, when the resin is pushed outward by heat sealing, the resin remains in the non-adhesive region 32, so that it is possible to prevent the formation of a resin pool on the fitting 20. The width of the non-adhesive area 32 is not particularly limited, but it is preferable that it be 1 to 10 mm from the edge of the heat seal paper 4 (the tip edge 31a of the fold-back piece 31), and it is more preferable that it be 2 to 5 mm from the edge of the heat seal paper 4.

[0032] In the first example of the heat sealable paper bag 1 with fittings according to this embodiment, the sealing edge 13 has a bottom edge 13a facing the opening edge 12, and a left edge 13b and a right edge 13c connecting the facing ends of the opening edge 12 and the bottom edge 13a, as shown in Fig. 1, and the bag body 10 preferably has free portions 33 in which the opposing fold-back pieces 31 are not bonded to each other in the areas of the left edge 13b and the right edge 13c closer to the opening edge 12 than the fittings 20, as shown in Fig. 7. Fig. 7 shows the right edge 13c as a representative example, but the left edge 13b has a similar configuration. In the case of a typical synthetic resin film zipper bag having heat seal parts on both sides of the opening edge, i.e., when the base materials arranged opposite each other are bonded to each other at the left and right edges, the left and right ends of the bag are closed at the top of the bag to form a ring, restricting the movement of the base materials in the direction away from each other, so a strong force is required to disengage the interlocking device 20, and it may be difficult for a person with weak strength to open the bag. In contrast, by having the free part 33, the left and right ends of the bag are not stuck together at the top of the bag, so when the base materials are moved in the direction away from each other (for example, arrow 34 in Fig. 7), the free part 33 opens in a Y-shape or T-shape in a side view of the bag, making it easier to disengage the interlocking device 20, and even a person with weak strength can easily open the bag.

[0033] In the first example of the heat seal paper bag with fitting 1, as shown in Fig. 2, the opposing folded pieces 31 of the opposing folded pieces may be in a non-adhered state so that the opening edge 12 remains open, or the opposing folded pieces 31 may have an opening sealing portion (not shown) that closes the opening edge 12. The opening sealing portion may be, for example, a joint portion in which the paper base materials 2 of the opposing folded pieces 31 are joined together via an adhesive member (not shown), or a heat seal portion in which the heat seal paper 4 further has an outer heat seal layer (not shown) provided on the surface opposite to the side on which the inner heat seal layer 3 of the paper base material 2 is provided, and the outer heat seal layers of the opposing folded pieces 31 are thermally bonded together.

[0034] When the heat sealable paper bag with fitting 1 has an opening sealing portion, the bag body 10 preferably has an intended opening portion between the opening sealing portion and the fitting 20. The intended opening portion is not particularly limited, and is, for example, an easy-to-open processing portion such as a notch, a perforation line, or a half-cut line.

[0035] The heat-sealed paper bag with fitting 1 according to this embodiment encompasses a second example of a heat-sealed paper bag with fitting 100 in which the covering part 130 has the following configuration. The heat-sealed paper bag with fitting 100 of the second example has the same basic configuration as the heat-sealed paper bag with fitting 1 of the first example, except for the different configuration of the covering part 130. Here, a description of the common configuration will be omitted, and only the different configuration will be described.

[0036] In the second example of the heat-sealed paper bag 100 with a fitting according to this embodiment, the bag body 10 has a first heat-seal tape 101 (shown in Figure 9) that covers the edges 22a, 27a on the opening edge 12 side of the base (male base 22 and female base 27), as shown in Figures 8 and 9, and the covering portion 130 includes a form having a thermally bonded portion H3 between the bases 22, 27 and the first heat-seal tape 101.

[0037] The first heat seal tape 101 is a thin and elongated film having heat sealability on at least one side. The width of the first heat seal tape 101 is not particularly limited as long as it can cover the edge 22a, 27a on the opening edge 12 side of the base (male base 22 and female base 27), but is, for example, 2 to 20 mm. The first heat seal tape 101 may be, for example, a tape made of a thermoplastic resin, or a tape having a heat seal layer provided on at least one side of a high melting point base material. The material of the high melting point base material is not particularly limited, and is, for example, paper, or a synthetic resin such as nylon or polyethylene terephthalate. The material of the heat seal layer is not particularly limited, and is, for example, the materials listed for the inner heat seal layer 3. In the covering portion 130, the edge 22a, 27a on the opening edge 12 side of the base 22, 27 is fixed in a sandwiched state between the inner heat seal layer 3 and the first heat seal tape 101, and the fixing of the base 22, 27 to the bag body 10 is reinforced. By covering and fixing the bases 22, 27 with the first heat seal tape 101, it is possible to prevent the fitting 20 from peeling off from the bag body 10 when the fitting 20 is released from its engagement.

[0038] In the second example of the heat sealable paper bag 100 with a fitting according to this embodiment, the bag body 10 preferably has an opening sealing portion 103, in which opposing inner heat seal layers 3 are thermally bonded together, on the opening edge portion 12 side of the fitting 20, as shown in Figures 8 and 9. The opening sealing portion 103 has a thermally bonded portion H4 between opposing inner heat seal layers 3. The bag can be stored in a sealed state.

[0039] When the heat sealable paper bag with fitting 100 has the opening sealing portion 103, the bag body 10 preferably has an intended opening portion 104 between the opening sealing portion 103 and the fitting 20, as shown in Fig. 8. The intended opening portion 104 is not particularly limited, and may be, for example, a notch as shown in Fig. 8, or an easy-to-open processing portion such as a perforation line or a half-cut line.

[0040] So far, we have explained the heat-sealed paper bag with a fastening device 1,100 of this embodiment by showing the first and second examples, but the heat-sealed paper bag with a fastening device 1,100 of this embodiment is not limited to these and may be modified in various ways.

[0041] In the heat seal paper bag 1,100 with a fitting according to this embodiment, the bag body 10 has a second heat seal tape 102 covering the edge 22b, 27b of the base 22, 27 on the side opposite to the opening edge 12, as shown in FIG. 9 or FIG. 10, and the second heat seal tape 102 is preferably heat-bonded to the base 22, 27. The second heat seal tape 102 is a long and narrow film having heat sealability on at least one side, and has a similar configuration to the first heat seal tape 101. The edge 22b, 27b of the base 22, 27 on the side opposite to the opening edge 12 is sandwiched and fixed between the inner heat seal layer 3 and the second heat seal tape 102, thereby reinforcing the fixation of the base 22, 27 to the bag body 10. This makes it possible to suppress the fitting 20 from peeling off from the bag body 10 due to the internal pressure of the bag.

[0042] The biomass ratio to the total mass of the heat sealable paper bag with fitting 1,100 is preferably 5 to 90 mass%, and more preferably 25 to 85 mass%. The biomass ratio is the ratio of plant-derived components to the total mass of the heat sealable paper bag with fitting. [Explanation of symbols]

[0043] 1,100 Heat-sealed paper bags with fittings 2 Paper base material 3. Inner heat seal layer 4. Heat seal paper 10 Bags 11 Storage section 12 Opening edge 13(13a,13b,13c) Sealing edge 13a Bottom edge 13b Left edge 13c Right edge 20 Fittings 21 Male member 22 Male base 22a Edge of the male base on the opening edge side 22b Edge of the male base opposite to the opening edge side 23 Male occlusion 26 Female member 27 Female base 27a Edge of the female base on the opening edge side 27b Edge opposite to the opening edge of the female base 28 Female occlusion 30 Covering section 31 Folding piece 31a Tip edge of folded piece 32 Non-adhesive area 33 Free Part 101 First heat seal tape 102 Second heat seal tape 103 Opening sealing part 104 Opening planned area 130 Covering part

Claims

1. a bag body including a heat seal paper having at least a paper base material and an inner heat seal layer provided on one surface of the paper base material, the heat seal paper being disposed facing each other with the inner heat seal layer on the inside, the bag body having a storage section, an opening edge portion communicating with the storage section, and a sealing edge portion in which the inner heat seal layers are thermally bonded to each other at the periphery of the storage section; A fitting made of a thermoplastic resin is fixed to the inner heat seal layer along the opening edge portion, The fitting has male and female members that mate with each other, The male member and the female member each have a base portion fixed to the inner heat seal layer and a bite portion standing upright from the base portion, A heat-sealed paper bag with a fitting, characterized in that the edge of the base portion on the opening edge side is covered and fixed with a covering portion.

2. the bag body has a fold-back piece that folds back the heat seal paper at the opening edge into the bag body to cover the edge of the base on the opening edge side, 2. The heat-sealable paper bag with fitting according to claim 1, wherein the covering portion has a thermally bonded portion between the base portion and the inner heat-sealed layer of the folded-back piece.

3. the sealing edge portion has a bottom edge portion opposed to the opening edge portion, and a left edge portion and a right edge portion connecting opposing ends of the opening edge portion and the bottom edge portion, The heat-sealed paper bag with fittings according to claim 2, characterized in that the bag body has free portions in the areas of the left and right edges of the bag body that are closer to the opening edge than the fittings, in which the opposing folded pieces are not bonded to each other.

4. 3. The heat-sealable paper bag with fitting according to claim 2, wherein the heat-sealable paper has a non-adhesive area along the leading edge of the folded piece where the inner heat-sealable layer is not provided.

5. The bag body has a first heat seal tape covering an edge portion of the base portion on the opening edge portion side, 2. The heat sealable paper bag with fitting according to claim 1, wherein the covering portion has a thermally bonded portion between the base portion and the first heat seal tape.

6. The bag body has a second heat seal tape covering an edge portion of the base portion on the opposite side to the opening edge portion, 6. The heat sealable paper bag with fitting according to claim 2 or 5, wherein the second heat seal tape is thermally bonded to the base.

7. 6. The heat-sealable paper bag with fitting according to claim 5, characterized in that the bag body has an opening sealing portion on the opening edge side of the fitting, in which the facing inner heat-seal layers are thermally bonded to each other.

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