Double bag

Abstract

The present invention provides a double-layered bag that uses three films, offers excellent openability in the width direction, and allows for efficient resealing of the opening end of the third film. [Solution] A double bag comprising a first film, a second film, and a third film, each having a front and a back surface, wherein the first film and the second film form a storage section for storing articles with their back surfaces facing each other, at least the front surface of the first film is printed, the third film covers the front surface of the first film, and the double bag is provided with two notches on the side of the upper part of the main body for opening the double bag, and an opening line provided in the width direction of the main body starting from the notches, and the back surface of the third film is provided with an adhesive portion for resealing the openings of the first and second films by folding back the third film.

Description

Technical Field

[0001] The present invention relates to a double bag, and particularly to a double bag having excellent sealing and resealing properties.

Background Art

[0002] There are products in which foods, agricultural chemicals, etc. are enclosed in a bag body. For such products, it is necessary to describe the usage method and the like. However, if detailed usage methods are described outside the bag body, there are problems such as harming the aesthetics of the product. Also, in order to describe a lot of information, using only both sides of the bag body may be insufficient.

[0003] For this reason, a bag body provided with a fold-out part has been developed (see, for example, Patent Document 1). The bag body described in this document is a bag body formed by folding a single sheet and heat-sealing the left and right side edges and the lower edge, which is rectangular and consists of a front surface part, an intermediate surface part, and a back surface part formed in substantially the same size. The front surface part and the intermediate surface part are heat-sealed at the left and right side edges and the lower edge to form a bag main body having an opening at the upper edge. The front surface part is heat-sealed at one side edge, the lower edge, and the upper edge to the one side edge, the lower edge, and the upper edge of the bag main body, and a winding opening is formed at the remaining other side edge. Information on the contents is printed on at least the outer surface of the front surface part, the outer surface of the intermediate surface part, and the outer surface of the back surface part. The information printed on the outer surface of the intermediate surface part is characterized in that it is exposed when the back surface part is peeled off from the bag main body.

[0004] Also, after opening the bag body, when only a part of the contents is used, it is necessary to store the remaining contents. In this case, it is also possible to use a bag with a zipper. However, a method for storing the contents more easily and at a lower cost is required. For example, Patent Document 2 discloses a bag body provided with a cutting part via a perforation, cutting the perforation to obtain a string-like part, and using this as a sealing string for the bag.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2009-29476 [Patent Document 2] Utility Model Publication No. 60-54539 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The bag described in Patent Document 1 does not mention using the contents in several portions after opening the bag. Therefore, regarding resealing the compartment for the cut-out contents... It is not stated. It would be preferable to have a bag that can be resealed when using the contents in several portions after opening.

[0007] In the bag described in Patent Document 1, the back surface is peeled off to read the information printed inside. However, in the bag described in Patent Document 1, the peeled-off back surface remains separate from the bag. Therefore, it is preferable to have a bag that allows the peeled-off back surface to be resealed.

[0008] In the bag described in Patent Document 2, it is necessary to provide a cut section via perforations in order to obtain a string-like portion. Therefore, it is desirable to reseal the bag itself using materials that would normally be discarded as waste. Furthermore, there is a demand for double bags with even higher resealability and resealability.

[0009] The present invention was made to solve the problems of the prior art described above, and provides a double-layered bag that is excellent in terms of ease of opening, resealability, and resealing. [Means for solving the problem]

[0010] The invention according to claim 1 is, A double-layered bag comprising a first film, a second film, and a third film, each having a front and a back surface, The double bag in question is, The first film and the second film form a storage compartment for storing articles with their back surfaces facing each other, and at least the surface of the first film is printed, and the third film covers the surface of the first film. Two notches for opening the double bag are provided on the side of the upper part of the main body of the double bag, Starting from the notched portion, the opening line provided in the width direction of the main body of the double bag, Equipped with, The present invention relates to a double-layered bag characterized in that the back surface of the third film is provided with an adhesive portion for resealing the openings of the first and second films by folding back the third film.

[0011] The invention according to claim 2 relates to the double bag according to claim 1, wherein the opening line is formed of a film having straight-cut properties or a film that has been processed to cut straight.

[0012] The invention according to claim 3 relates to the double bag according to claim 1, characterized in that, in the height direction of the double bag, a fold line is provided on the side opposite to the side on which the opening line is provided, and the fold line forms a gusset that allows the double bag body to stand upright.

[0013] The invention according to claim 4 is, Divide a single resin film into three roughly equal parts along its length: a first surface, a second surface, and a third surface. The first surface of the aforementioned resin sheet is folded onto the second surface. Part coat treatment is applied to the upper and lower edges of the double bag on the first surface. The double-sided tape is placed at a position where it adheres to a portion substantially separated from the boundary between the first surface and the second surface, such that the first surface becomes the weakly adhesive side and the third surface becomes the strongly adhesive side. Fold the third surface onto the first surface, The edges of the first surface and the boundaries between the second and third surfaces, the boundaries between the first and second surfaces, the bottoms of the first and second surfaces, and the edges of the first surface and the boundaries between the second and third surfaces and the lower sides of the double bag are heat-sealed in an oblique direction. The heat-fused portion, which is heat-fused in the diagonal direction, forms a woven line that is approximately triangular. This relates to a method for manufacturing double-layered bags.

[0014] The invention according to claim 5 is, A method for manufacturing a double-layered bag, comprising a first film, a second film, and a third film, each having a front and a back surface, The back surface of the first film and the back surface of the second film are superimposed, double-sided tape is placed along the longitudinal direction at a position spaced apart from the longitudinal edge on the surface of the first film, and a part-coat treatment is performed along the short direction of the upper and lower edges on the surface of the first film. The back surface of the third film is placed on the front surface of the first film. The longitudinal direction of the back surface of the first film and the back surface of the second film, the short direction of the back surface of the first film and the back surface of the second film, the longitudinal direction of the back surface of the first film and the back surface of the second film and the back surface of the third film, and the diagonal lines connecting the longitudinal direction of the back surface of the back surface of the first film and the back surface of the second film and the lower sides on both sides of the short direction of the back surface of the back surface of the first film and the back surface of the second film are heat-fused together. The heat-fused portion, which is heat-fused in the diagonal direction, forms a woven line that is approximately triangular. This relates to a method for manufacturing double-layered bags. [Effects of the Invention]

[0015] The double bag according to the invention of claim 1 includes two notch portions provided on the main body side portion of the double bag for opening the double bag, and an opening line provided in the width direction of the main body of the double bag starting from the notch portions. As a result, it is possible to provide a double bag having excellent opening property in the width direction of the main body of the double bag. Further, on the back surface of the third film, there is provided an adhering portion for sealing the opening ends of the first film and the third film to the double bag. As a result, the storage portion can be resealed efficiently.

[0016] The double bag according to the invention of claim 2, wherein the opening line is formed of a film having straight cut property or a film that has been subjected to straight cut processing. As a result, the opening of the double bag can be surely performed in a desired direction.

[0017] The double bag according to the invention of claim 3 can provide a gusset to the double bag by weaving the double bag into the bag with a woven line. As a result, the double bag can be made to stand on its own.

[0018] According to the manufacturing method of the double bag of the invention of claim 4, the third surface has a strong adhesive surface. After taking out a part of the article from the upper part of the storage portion composed of the first surface and the second surface by the notch portion and the opening line, by covering and fixing the third surface, a double bag that can be resealed can be easily manufactured. Also, a gusset can be easily provided to the double bag.

[0019] According to the method of the invention of claim 5, the double bag can be manufactured by a simple method.

Brief Description of the Drawings

[0020] [Figure 1] It is a perspective view of the double bag according to the present invention. [Figure 2] (a) It is a front view of the double bag according to the present invention and (b) a cross-sectional view of the double bag in the A-A direction. [Figure 3]This is an unfolded diagram illustrating the state of the double bag according to the present invention after it has been opened. [Figure 4] This figure illustrates the resealability of the double-layered bag using the resealing portion according to the present invention. [Figure 5] This figure illustrates a method for manufacturing a double-layered bag according to the present invention. [Figure 6] This figure shows a specific example of the manufacturing of the double-layered bag according to the present invention. [Figure 7] This is an explanatory diagram of another method for manufacturing a double bag according to the present invention. [Modes for carrying out the invention]

[0021] (double bag) Hereinafter, preferred embodiments of the double bag according to the present invention will be described with reference to the drawings. Figure 1 is a perspective view of the double-layered bag according to the present invention. Figure 2 is (a) a front view of the double-layered bag according to the present invention and (b) a cross-sectional view of the double-layered bag in direction AA. As can be seen from Figures 1 and 2, the double-layered bag 1 of the present invention has a first film 2 and a second film 3 that constitute a storage section 4 for storing articles. The surface of the first film 2 is printed, and the third film 5 covers the surface of the first film 2. Articles are stored in the storage section 4. The top edge of the double-layered bag is open until articles are stored inside.

[0022] As shown in Figure 2, the first film 2 and the third film 5 have edges in the width direction that are heat-sealed and edges where double-sided tape is inserted. The edges in the height direction are part-coated.

[0023] As shown in Figure 2, two notches 8 are provided on the side of the upper part of the main body of the double bag of the present invention. In addition, an opening line (not shown) is provided in the width direction of the main body of the double bag, starting from the tip of the notches 8. When force is applied to the notches 8 to open the double bag, the opening line allows for a straight cut, enabling proper opening without tearing. As the film having straight-cut properties, a resin material having straight-cut properties such as uniaxially oriented or biaxially oriented film, or a film whose straight-cut properties are obtained by a known method such as creating grooves for straight cuts using a laser can be used. After placing an item in the storage section 4, the first film 2 and the second film 3, which are located at the upper edge of the storage section 4, are heat-sealed. When heat-sealed, there is a risk that the opening line will melt. For this reason, the notches 8 and the opening line are required to be provided at a position below the position where the double bag is heat-sealed and below the position where the part-coat treatment is applied, relative to the upper edge of the double bag.

[0024] In the storage section 4 of the double-layered bag 1 of the present invention, stored items such as medicines, food, or cosmetics are placed through the opening at the upper edge shown in Figure 1. After the stored items are placed inside, the storage section 4 is sealed by heat-sealing the opening.

[0025] The surfaces of the second film 3 and the third film 4 of the double-layered bag are printed. This printing serves as a guide for the user before opening the double-layered bag to help them make a purchase decision. For example, if the contents are pesticides, the product name, manufacturer name, and distributor name are printed, along with instructions on how to open the bag and eye-catching design drawings. On the other hand, the surface of the third film 5 of the double-layered bag contains information about the product that users may find useful when making a purchase, such as examples of pesticide use, applicable diseases for various crops, and usage examples.

[0026] Figure 4 is a cross-sectional view in the BB direction of Figure 2 illustrating the opening, resealing, and re-sealing state of the double bag of the present invention. When a user removes an item from the bag, the double bag is opened from one notch 8 to the other, as shown in Figure 3. To open the double bag of the present invention, the reseal portion of the third film 5 is detached from the double bag body, and only the first film and the second film 5 are opened. This opening operation removes the upper edges of the first film and the second film 5, as shown in Figure 4(b). After this operation, the third film 5, which has an adhesive portion (e.g., double-sided tape), remains in the double bag. Since the short-side portions of the first film and the short-side portions of the third film 5 are part-coated, the third film 5 can be easily removed from the first film. By removing the third film 5, the printed surface printed on the surface of the first film is exposed, as shown in Figure 3. This allows the user to read the information printed on the surface of the first film. For example, in the case of pesticides, a table showing dilution ratios, usage volume, and application timing is printed. In the case of food products, information such as recipes is included. In this invention, printing is applied to three surfaces of the double bag: the surface of the first film, the surface of the second film, and the surface of the third film. Therefore, the user can obtain sufficient information from the printing on the double bag. Furthermore, after opening, the surface of the double bag that contacts the first part does not detach from the double bag, so necessary information is not lost.

[0027] Furthermore, the film forming the double bag of the present invention may be a laminated film having an aluminum layer, such as one made of laminated aluminum foil or one that has been coated with aluminum vapor deposition. A laminated film having an aluminum layer is preferred because it has a shielding effect. In this case, a film may be used in which a portion of the third film does not have an aluminum layer. With the third film attached to the first film, the printing applied to the surface of the first film can be seen from the portion of the third film where the aluminum layer does not exist. When the double bag is opened, the user can remove the attached portion of the third film and see the entire printing applied to the first film. In this way, it is also possible to provide information that combines the design applied to the first film and the design applied to the third film.

[0028] One of the most significant features of this invention is the provision of an adhesive portion. The adhesive portion allows the third film to be resealed after opening. Without resealability, the removed third film would move freely, hindering storage and other purposes. Double-sided tape can be used as the adhesive portion. Double-sided tape is used because it provides the easiest way to achieve resealability. It is preferable to use adhesive tapes with different tackiness levels. It is even more preferable that the weakly adhesive side is attached to the first film and the strongly adhesive side is attached to the third film. This is because, after cutting off the upper ends of the first and second films and removing the contents, as shown in Figure 4(c), the upper end of the third film can be placed over the opening of the double bag and fixed to the surface of the second film via double-sided tape. Even if the upper end of the third film is removed from the double bag multiple times, the strongly adhesive side remains on the third film, maintaining resealability until the end. Furthermore, if the strong adhesive side is attached to the third film, the third film will not fall out of the double bag even if the user reads the information printed inside the first part of the double bag multiple times.

[0029] Another of the most significant features of this invention is that it allows the double-layered bag to be resealed. This is because the double-layered bag of this invention is equipped with a resealing section. The resealing section of this invention also serves as the adhesive section.

[0030] As shown in Figure 4, the double-layered bag is opened using the opening lines at two notches 8 located on the sides of the upper part of the bag's body. Opening is performed up to the notch 8 on the opposite side of the upper part of the bag's body. The upper parts of the back surfaces of the first film and the second film are heat-sealed together when storing items. For this reason, the third film portion is detached from the bag's body when the bag is opened. In this invention, the portion of the third film remaining after opening is used as a resealing portion. Specifically, double-sided tape is attached to the back surface of the third film. In the opened bag body, the third film is folded back, a portion of the surface of the second film is covered with the third film from the opening, and the weakly adhesive portion of the double-sided tape on the third film is attached to the surface of the second film, allowing the bag to be easily resealed. Furthermore, in the double-layered bag of this invention, since the third film portion is resealed to the bag body, the bag body can be neatly folded.

[0031] In the height direction of the double bag, a fold line may be provided on the side opposite to the side where the opening line is provided, and this fold line may form a gusset that allows the double bag body to stand upright (not shown).

[0032] (Method of manufacturing a double bag) The double-layered bag of the present invention can be manufactured from a single film. Specifically, it can be manufactured by folding a single film using a gusseted bag-making machine and then heat-sealing it.

[0033] There are no particular restrictions on the film material that can be used; any material known to be used in the manufacture of bags can be used. For example, films can be selected and used from known resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid or methacrylic acid copolymer, methylpentene polymer, polybutylene resins, polyolefin resins such as polybutene resins, polyvinyl chloride resin, polyvinyl acetate resin, polyvinylidene chloride resin, vinyl chloride-vinylidene chloride copolymer, poly(meth)acrylic resin, polyacrylonitrile resin, polystyrene resin, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, ethylene-vinyl acetate copolymer saponified, diene resin, polyacetal resin, polyurethane resin, polyester resin, polybutylene terephthalate, polyamide resin, and others.

[0034] The above-mentioned film can be unstretched, uniaxially or biaxially stretched, or otherwise. The film can be manufactured using known methods such as extrusion, inflation, or coating. When using a film that can be cut linearly, it is preferable to use one that is uniaxially or biaxially stretched.

[0035] The film can be any film made of a material that has light-shielding properties and barrier properties against water vapor, water, oxygen, and gases that degrade the contents, and may be a single substrate or a composite material substrate made by combining two or more substrates.

[0036] Specific examples of barrier films include aluminum foil with light-shielding and barrier properties, resin films having a vapor-deposited aluminum film, resin films having a vapor-deposited film of inorganic oxides such as silicon dioxide and aluminum oxide with barrier properties, resin films such as high-density polyethylene, resin films such as polyvinylidene chloride, polyvinyl alcohol, and ethylene-vinyl acetate copolymer saponified products, and colored resin films with light-shielding properties obtained by kneading a resin with a coloring agent such as a pigment.

[0037] These film materials can also be used by laminating one or more types together. The thickness of the above resin film is usually 5 to 300 μm, preferably 10 to 100 μm.

[0038] For aluminum foil, a thickness of 5 to 30 μm is preferred. For aluminum or inorganic oxide vapor-deposited films, a thickness of 1 to 500 nm can be used. When barrier properties are important, the thickness should be 5 nm or more, preferably 10 nm or more, and when transparency is important, the thickness should be 300 nm or less, preferably 150 nm or less.

[0039] Examples of support films on which the above-mentioned vapor-deposited film is provided include polyester film, polyamide film, polyolefin film, polyvinyl chloride film, polycarbonate film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer saponified film, and the like.

[0040] The heat-sealable films used to form packaging bags by heat-sealing the films together are resin films that melt and fuse with each other when heated. Specific examples of such films include medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, methylpentene polymer, and acid-modified polyolefin resins.

[0041] The film thickness is 30 to 300 μm, preferably 40 to 150 μm. These resins may also contain appropriate amounts of additives, such as fillers, dispersants, colorants, and others, as needed.

[0042] When using laminated resin films, it is preferable to use a laminate in which one surface is laminated with a heat-sealable film and the other surface is laminated with a non-heat-sealable film. Lamination can be carried out by known methods such as dry lamination or solvent-free dry lamination.

[0043] During the lamination process described above, pretreatments such as corona treatment and ozone treatment can be applied to the resin film as needed.

[0044] A specific example of the manufacturing of the double-layered bag of the present invention is described below, but the present invention is not limited thereto. For example, it can be manufactured using a known three-side seal packaging machine.

[0045] Figure 5 illustrates a method for manufacturing the double-layered bag of the present invention from a single strip-shaped sheet, which is the material for the double-layered bag of the present invention. Figure 6 shows a specific example of the manufacturing of the double-layered bag of the present invention. Figure 7 shows a laminated state illustrating a method for manufacturing the double-layered bag of the present invention from three strip-shaped sheets, which are the material for the double-layered bag of the present invention.

[0046] The resin sheet used shall have the necessary printing applied to its surface. Printing may be done using any known method. The reverse side shall be aluminum-coated or have aluminum foil attached. When folding, the side with the aluminum coating or aluminum foil attached shall be folded upwards. A resin layer may be laminated on top of the aluminum layer.

[0047] As shown in Figure 5, first, one resin sheet is folded with the first surface 2 on top of the second surface 3. The resin sheet is a laminated film in which the surface is made of a resin that does not have heat-sealing properties and the back surface is made of a resin that has heat-sealing properties. The back surface of the resin sheet is placed facing up, and the first surface 2' is folded onto the second surface 3'. After that, part-coating is performed on the left and right ends of the double pocket of the first surface 2'. Part-coating is performed by a known processing method, for example, by printing an adhesive and melting it with heat to create adhesion. For part-coating, the adhesive is applied in a strip with a width of 5 to 10 mm.

[0048] Next, the double-sided tape 6 is applied to a position slightly away from the point where the first surface 2' contacts the edge of the third surface 5'. As shown in Figure 6, the double-sided tape 6 is applied to the portion of the double bag that is spaced away from the boundary between the first surface 2' and the second surface 3' in the longitudinal direction of the double bag. A suitable double-sided tape is, for example, TL-83* (manufactured by Lintec Corporation). The double-sided tape should have a width of, for example, 10 to 25 mm. It can be appropriately selected depending on the size of the double bag and the type of items to be stored.

[0049] Next, the third surface 5' is folded so that it covers the first surface 2'. The notch portion 8 can be manufactured by punching out the portion of the end of the first surface of an adjacent double bag that is sandwiched between the second and third surfaces, as shown in Figure 6, and cutting the adjacent double bag. In this way, the notch portion 8 is formed after the double bag has been manufactured.

[0050] Next, as shown in Figure 6, the folded sheet is subjected to heat fusion treatment. The heat fusion treatment is performed on part 10 in Figure 5. The first surface 2', the second surface 3', and the overlapping part of the third surface 5' where the third surface 5' is folded back are heat-fused, as well as the connection between the first surface 2' and the second surface 3' where the first surface 2' is folded back. The heat fusion time varies depending on the resin used, but is usually 120-200°C for 0.3-1.0 seconds.

[0051] Subsequently, by cutting the sides of adjacent double bags, a double bag can be manufactured in which the first surface 2' and the second surface 3' constitute a storage section for storing articles, the surface of the first surface 2' is printed, and the third surface 5' covers the surface of the first surface 2'. As shown in Figure 6, by heat-sealing the sides of the double bags in a wide area and cutting the center between adjacent heat-sealed double bags, reliable fusion of the sides can be ensured. Since the bottom of the double bag is heat-sealed between the first surface 2' and the second surface 3', articles can be securely stored even when they are placed inside. The notch portion 8 is provided below the position where double-sided tape is inserted in the double bag of the present invention. The notch portion 8 is created by punching out the portion where the edge of the first surface connected to the opening line and the boundary between the second and third surfaces have been heat-sealed before cutting the double bag.

[0052] Furthermore, the double bag of the present invention can also be manufactured as follows. A first film 2, a second film 3, and a third film 5 are prepared, each having a front and a back surface. Each film is a laminated film in which the front surface is made of a resin that does not have heat-sealing properties and the back surface is made of a resin that has heat-sealing properties.

[0053] Next, the back surface of the first film 2 is placed on the back surface of the second film 3. Double-sided tape 6 is placed on the longitudinal edge of the first film 2 on its surface. Partial coating is applied to the left and right short edges of the first film 2 on its surface. The back surface of the third film 5 is placed on the surface of the first film 2.

[0054] As shown in Figure 6, in this laminate of three films, the longitudinal direction of the back surface of the first film and the back surface of the second film, and the short direction of the back surface of the back surface of the first film and the back surface of the second film are heat-sealed. The heat-sealing process is performed on the area marked 10 in Figure 7. After these steps, the double bag of the present invention can be manufactured by cutting and forming a notch.

[0055] The double-layered bag of the present invention is not limited to the method described above, and can also be manufactured, for example, by using an adhesive instead of heat sealing.

[0056] Furthermore, when a gusset is to be added to a double bag, heat fusion is performed diagonally on the side that will become the bottom of the storage compartment of the double bag, connecting the bottom of the double bag and the lower part of the side of the double bag. After each double bag is cut, the bottom part, which forms a roughly triangular shape from the side, bottom, and diagonal fusion, is cut open. Here, the heat-fused portion that connects the bottom of the double bag and the lower part of the side of the double bag becomes a fold line. By pushing this fold line inward, a gusset is formed. [Examples]

[0057] A 12μm thick PET film was partially coated on the surface and printed with a design on the reverse side. The oil-based part-coating agent used was Seikadine B-93 (manufactured by Dainichi Seika Kogyo). The printed PET film was then solvent-dry laminated with other materials to produce a laminated film consisting of part-coated PET, printed film, adhesive, 12μm thick aluminum-metallized PET film, adhesive, and 60μm thick LLDPE film.

[0058] Next, the PET film surface was laser-processed to provide straight-cut properties. With the resulting laminated film surface facing downwards, the laminated film was folded upwards using a gusseted bag-making machine. Specifically, the first surface was folded onto the second surface, double-sided tape was applied to a position where the first surface was separated from the edge of the third surface, and the third surface was folded onto the first surface. After that, the edge of the first surface and the boundary between the second and third surfaces, and the boundary between the first surface and the second surface were heat-sealed. A notch was created by punching out a square shape from a portion of both sides where the opening line was provided.

[0059] Furthermore, by cutting the double bag at the bottom, the first film and the second film form a storage compartment for storing articles, and the surfaces of the first film, the second film, and the third film are printed, with the third film covering the surface of the first film, thus manufacturing a double bag.

[0060] The contents were filled into the double-layered bag by using a filling nozzle through the opening at the top of the storage compartment. Immediately after filling was completed, the bag was heat-sealed.

[0061] The packaged product is opened by peeling the third film from the double bag body and opening the double bag horizontally between the notches. Because it has a straight-line cut capability, it could be opened along the opening line. When the first and second films are cut, the height of the first and second films becomes lower than that of the third film. After removing some of the items from the storage compartment, the top of the first and second films is covered with the third film. Since double-sided tape is attached to the back of the third film, the third film can be resealed and the double bag can be easily resealed.

[0062] The effects of the present invention will be made clearer by illustrating examples of the double-layered bag according to the present invention. However, the present invention is not limited in any way to these examples.

[0063] In addition to the embodiments described above, the present invention can be modified in various ways without altering the essence of the invention. [Industrial applicability]

[0064] The present invention is suitably used, for example, in packaging for food, pesticides, cosmetics, and the like. [Explanation of Symbols]

[0065] 1 double bag 2. First film 2' First side 3. The second film 3' Second side 4 Storage compartment 5. The third film 5' Third side 6. Double-sided tape 7. Attachment area 8 Notch section 9 Re-sealing section 10 Heat-sealed joint

Claims

1. A double-layered bag comprising a first film, a second film, and a third film, each having a front and a back surface, The double bag in question is, The first film and the second film have their back surfaces facing each other to form a storage compartment for storing articles, at least the surface of the first film is printed, and the third film covers the surface of the first film. Two notches for opening the double bag are provided on the side of the upper part of the main body of the double bag, Starting from the notched portion, the opening line provided in the width direction of the main body of the double bag, Equipped with, The back surface of the third film has an adhesive portion for folding the third film back to reseal the openings of the first film and the second film. A double bag characterized by being equipped with [a specific feature].

2. The double bag according to claim 1, wherein the opening line is formed of a film having straight-cut properties or a film that has been processed to cut straight.

3. The double bag according to claim 1, characterized in that, in the height direction of the double bag, a fold line is provided on the side opposite to the side on which the opening line is provided, and the fold line forms a gusset that allows the double bag body to stand upright.

4. Divide a single resin film into three roughly equal parts along its length: a first surface, a second surface, and a third surface. The first surface of the aforementioned resin sheet is folded onto the second surface. Part coat treatment is applied to the upper and lower edges of the double bag on the first surface. The double-sided tape is placed at a position where it adheres to a portion substantially separated from the boundary between the first surface and the second surface, such that the first surface becomes the weakly adhesive side and the third surface becomes the strongly adhesive side. Fold the third surface onto the first surface, The edges of the first surface and the boundaries between the second and third surfaces, the boundaries between the first and second surfaces, the bottoms of the first and second surfaces, and the edges of the first surface and the boundaries between the second and third surfaces and the lower sides of the double bag are heat-sealed in an oblique direction. The heat-fused portion, which is heat-fused in the diagonal direction, forms a woven line that is approximately triangular. A method for manufacturing a double-layered bag.

5. A method for manufacturing a double-layered bag, comprising a first film, a second film, and a third film, each having a front and a back surface, The back surface of the first film and the back surface of the second film are superimposed, double-sided tape is placed along the longitudinal direction at a position spaced apart from the longitudinal edge on the surface of the first film, and a part-coat treatment is performed along the short direction of the upper and lower edges on the surface of the first film. The back surface of the third film is placed on the front surface of the first film. The longitudinal direction of the back surface of the first film and the back surface of the second film, the short direction of the back surface of the first film and the back surface of the second film, the longitudinal direction of the back surface of the first film and the back surface of the second film and the back surface of the third film, and the diagonal lines connecting the longitudinal direction of the back surface of the back surface of the first film and the back surface of the second film and the lower sides of both sides of the short direction of the back surface of the back surface of the first film and the back surface of the second film are heat-fused together. The heat-fused portion, which is heat-fused in the diagonal direction, forms a woven line that is approximately triangular. A method for manufacturing a double-layered bag.

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