Double bag

Abstract

The present invention provides a double-layered bag that offers excellent openability in the width direction of the main body of the double-layered bag, even when using three films, and that 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, 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 surface of the first film is printed, the third film covers the surface of the first film, and the double bag is provided with a notch on the side of the upper part of the main body 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, and the surface of the first film is provided with an adhesive portion for resealing the opening ends of the first film and the third film to the double bag.

Description

Technical Field

[0001] The present invention relates to a double bag, and particularly to a double bag having excellent resealability and reclosure property.

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 damaging the aesthetics of the product. Also, in order to describe a lot of information, it may be insufficient to use only both sides of the bag body.

[0003] Therefore, a bag body provided with a gusset 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. It is rectangular and consists of a front surface portion, an intermediate surface portion, and a back surface portion formed in substantially the same size. The front surface portion and the intermediate surface portion 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 portion 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 portion, the outer surface of the intermediate surface portion, and the outer surface of the back surface portion. The information printed on the outer surface of the intermediate surface portion is exposed when the back surface portion is peeled off from the bag main body. It is a bag body characterized by this.

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

[0006] The bag described in Patent Document 1 requires tearing three films when opening the bag. This can result in the bag separating during opening. Therefore, even when using three films, there is a need for a bag that offers excellent openability.

[0007] In the bag described in Patent Document 1, the back side is peeled off to read the information printed inside. However, in the bag described in Patent Document 1, the peeled-off back side remains detached from the bag. Therefore, the peeled-off back side is not fixed in place and becomes a hindrance. Consequently, a bag that allows the back side to be resealed is required.

[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. For this reason, it is desirable to reseal the bag itself using materials that would normally be discarded as waste.

[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 constitute a storage compartment for storing articles, with at least the surface of the first film being printed, and the third film covering the surface of the first film. A notch for opening the double bag is 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 bag characterized in that the surface of the first film is provided with an adhesive portion for resealing the opening ends of the first film and the third film to the double bag.

[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 the portion of the first part cut off by the opening line constitutes an annular resealable portion.

[0013] The invention according to claim 4 relates to the double bag according to claim 1, characterized in that the portion cut off by the opening line constitutes a strip-shaped resealable portion.

[0014] The invention according to claim 5 divides a single resin film into a first surface, a second surface, and a third surface so as to be approximately three equal parts in the longitudinal direction, 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. Apply double-sided tape to the portion of the first surface that contacts the edge of the third surface. The edge of the first surface and the boundary between the second and third surfaces, the boundary between the first and second surfaces, and the bottom of the first and second surfaces are heat-fused together. This relates to a method for manufacturing double-layered bags.

[0015] The invention according to claim 6 is a method for manufacturing a double 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 placed on top of each other, double-sided tape is placed along the longitudinal direction on the longitudinal edge of the surface of the first film, and a part-coat treatment is performed along the short direction of the upper and lower edges of the surface of the first film. The back surface of the third film is placed on the front surface of the first film. The present invention relates to a method for manufacturing a double-layered bag, which involves heat-sealing the longitudinal direction of the back surface of the first film and the back surface of the second film, one of the transverse directions of the back surface of the first film and the back surface of the second film, and the longitudinal direction of the back surfaces of the first film, the second film, and the third film. [Effects of the Invention]

[0016] The double-layered bag according to claim 1 comprises a notch provided on the side of the main body of the double-layered bag for opening the double-layered bag, and an opening line provided in the width direction of the main body of the double-layered bag, starting from the notch. As a result, even when using three films, it is possible to provide a double-layered bag that offers excellent openability in the width direction of the main body of the double-layered bag. Furthermore, the surface of the first film is provided with an adhesive portion for resealing the open ends of the first film and the third film to the double bag. As a result, the open end of the third film can be efficiently resealed.

[0017] The double bag according to claim 2 has an opening line formed from a film having straight-cut properties or a film that has been processed to cut straight lines. As a result, the double bag can be reliably opened in the desired direction.

[0018] In the double bag of the invention according to claim 3, the portion cut off by the opening line forms an annular resealable portion. As a result, by folding and inserting the opened double bag into the annular resealable portion, the opened double bag can be resealed.

[0019] In the double bag of the invention according to claim 4, the portion cut off by the opening line forms a strip-shaped resealable portion. As a result, by winding the strip-shaped resealable portion around the folded opened double bag, the opened double bag can be resealed.

[0020] According to the method of the invention according to claim 5, a resealability can be imparted between the first surface and the third surface in a simple manner. Further, by heat-sealing the edge of the first surface and the boundary portions of the second and third surfaces, the boundary portion of the first and second surfaces, and the bottom of the first and second surfaces, a bag having strength can be obtained for the first portion for storing articles and the like.

[0021] According to the method of the invention according to claim 6, by using three films, a similar double bag can be manufactured without folding a single film.

Brief Description of the Drawings

[0022] [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] It is a perspective view for explaining the opened state of the double bag according to the present invention. [Figure 4] It is a view for explaining the resealability using the resealable portion of the double bag according to the present invention. [Figure 5] It is a view for explaining the resealability using another-shaped resealable portion of the double bag according to the present invention. [Figure 6] It is an explanatory view of the manufacturing method of the double bag according to the present invention. [Figure 7] It is an explanatory view of another manufacturing method of the double bag according to the present invention. [Figure 8] This is an explanatory diagram of another method for manufacturing a double bag according to the present invention. [Modes for carrying out the invention]

[0023] (double bag) Hereinafter, preferred embodiments of the double bag according to the present invention will be described with reference to the drawings. This is a perspective view of the double-layered bag according to the present invention. Figure 2 shows (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.

[0024] As shown in Figure 2, between the first film 2 and the third film 5, the widthwise edges include edges that are heat-sealed 10 and edges where double-sided tape 7 is inserted. The heightwise edges are part-coated.

[0025] As shown in Figure 2, a notch 8 is provided on the side of the upper part of the main body of the double bag of the present invention. An opening line (not shown) is also provided in the width direction of the main body of the double bag, starting from the tip of the notch 8. When force is applied to the notch 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 a film in which grooves for straight cutting are made using a laser can be used. After an article is placed in the storage section 4, the first film 2 and the second film 3, which are 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 notch 8 and the opening line are required to be located below the position where the double bag 1 is heat-sealed and below the position where the part-coat treatment is applied, relative to the upper edge of the double bag 1.

[0026] 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.

[0027] The surfaces of the second film 3 and the third film 5 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.

[0028] When a user removes an item from the bag, as shown in Figure 3, the double bag 1 is opened from the notch 8 to just before the adhesive part 7 on the opposite side of the top of the main body where the opening line is crushed by heat fusion. This opening process removes the upper edges of the first film 2 and the third film 5. When the third film 5 is removed from the adhesive part 7 (e.g., double-sided tape) provided on the first film 2, the printed surface of the first film 2 is exposed. This allows the user to read the information printed on the surface of the first film 2. For example, for pesticides, a table showing dilution ratios, usage volume, and usage timing is printed. For 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 2, the surface of the second film 3, and the surface of the third film 5. Therefore, the user can obtain sufficient information from the printing on the double bag. Furthermore, since the third film 5 does not detach from the double bag after opening, necessary information is not lost.

[0029] 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. In this case, a film may be used in which a portion of the third film 5 does not have an aluminum layer. With the third film 5 attached to the first film 2, the printing applied to the surface of the first film 2 can be seen from the portion of the third film 5 that does not have an aluminum layer. When the double bag is opened, the user can remove the attached portion of the third film 5 and see the entire printing applied to the first film 2. In this way, it is also possible to provide information that combines the design applied to the first film 2 and the design applied to the third film 5.

[0030] One of the most significant features of this invention is the provision of an adhesive portion 7, as shown in Figure 3. The adhesive portion 7 allows the third film 5 to be resealed after opening. Without resealability, the removed third film 5 would move freely, hindering storage and other purposes. Double-sided tape can be used as the adhesive portion 7. 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 strong adhesive side is attached to the first film 2 and the low adhesive side is attached to the third film 5. This is because the user can easily remove the third film 5 if they want to read the information printed on the first film 2 of the double bag. Furthermore, if the strong adhesive side is attached to the first film 2, it functions as a stopper to prevent the upper end from being cut off when the user opens the double bag.

[0031] Another of the most significant features of this invention is that the double bag can be made resealable. This is because the double bag of this invention is equipped with a resealable portion 9. The resealable portion is formed as follows.

[0032] Figure 4 shows one embodiment of the double bag of the present invention that utilizes the resealing portion 9. As shown in Figure 4(b), the double-layered bag is opened using an opening line through a notch 8 provided on the side of the upper part of the double-layered bag body. The opening stops on the opposite side of the upper part of the double-layered bag body. This is because the double-sided tape on the double-layered bag prevents tearing, or the heat sealing increases the tear resistance when cutting. The upper part of the storage section 4 is heat-sealed. Therefore, the portion cut off by the opening line is heat-sealed between the first film 2 and the second film 3. This heat-sealed portion of the first film 2 and the second film 3, along with the portion of the third film 5, remains in an annular shape. In this invention, this annular portion is used as a resealing section 9. Specifically, as shown in Figure 4(c), the opened bag body is folded and inserted into the ring of the annular resealing section 9. In this way, in this invention, the bag can be easily resealed using material that would otherwise be discarded. Furthermore, in the double-layered bag of the present invention, since the third film 5 portion is resealed to the bag body, the bag body can be neatly folded.

[0033] Other resealing sections are created as follows: As shown in Figure 5, the portion cut along the opening line is left in a ring shape. The heat-sealed portions of the first film 2 and the second film 3 are cut from the bag body. Since one end of the first film and the third film is provided with an adhesive portion, removing this adhesive portion from the ring portion forms a strip-shaped resealing section 9. In this invention, this strip-shaped portion is used as the resealing section 9. Specifically, the opened bag body is folded and the strip-shaped resealing section 9 is wrapped around it. The cut end of the strip-shaped resealing section 9 is attached to the adhesive portion 7 (adhesive tape) remaining at the other end. This allows the double bag to be resealed more securely. In this way, the present invention allows the bag to be easily resealed using materials that would otherwise be discarded. Furthermore, in the double bag of this invention, since the third film 5 is resealed to the bag body, the bag body can be neatly folded.

[0034] (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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] During the lamination process described above, pretreatments such as corona treatment and ozone treatment can be applied to the resin film as needed.

[0046] 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.

[0047] Figure 6(a) shows a cross-section of a single strip-shaped sheet, which is the material for the double bag of the present invention. Figure 6(b) shows a cross-section of the laminated sheet.

[0048] The resin sheet used has the necessary printing applied to one side. The printing can be done using any known method. The other side is aluminum-coated or has aluminum foil attached. When folding, the side with the aluminum coating or aluminum foil attached should be folded upwards.

[0049] As shown in Figure 6(a), 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 upwards, and the first surface 2' is folded onto the second surface 3'. After that, a part-coat treatment is applied to the upper and lower edges of the double-layered bag of the first surface 2'. The part-coat treatment is performed by a known treatment method, for example, by printing an adhesive and melting it with heat to create adhesion. Either an oil-based or water-based part-coat agent can be used. The appropriate choice can be made depending on the material of the film used.

[0050] Next, apply double-sided tape 6 to the portion where the first surface 2' contacts the edge of the third surface 5'. If the portion of the second part cut off by the opening line constitutes a resealable portion, apply double-sided tape 6 to the portion at the boundary between the first and second surfaces that is close to the heat-sealed portion, as shown in Figure 6(b). If a strip-shaped resealable portion is formed, apply double-sided tape 6 to the portion at the boundary between the first and second surfaces that is spaced away from the heat-sealed portion, as shown in Figure 6(b). A suitable double-sided tape 6 is, for example, TL-83* (manufactured by Lintec Corporation).

[0051] Next, the third surface 5' is folded so that it covers the first surface 2'. The notch portion 8 is made from a resin sheet with a cut in the part of the end of the first surface sandwiched between the second and third surfaces. This forms the notch portion after the third surface 5' is folded. Alternatively, as described above, the notch portion 8 can be formed by cutting out the position where the notch portion will be provided after the three-layer structure of the first surface 2', the second surface 3', and the third surface 5' has been formed. This method is preferable because it does not require the extra steps of alignment.

[0052] Next, as shown in Figure 7, the folded sheet is subjected to heat fusion treatment. The portion where the first surface 2', the second surface 3', and the third surface 5' overlap in the folded portion of the third surface 5', and the connection between the first surface 2' and the second surface 3' in the folded portion of the first surface 2' are heat-fused. In the cross-sectional area, the portion 10 enclosed by the dashed rectangle in Figure 6(b) is heat-fused. The heat fusion process varies depending on the resin used, but usually 120-200°C for 0.3-1.0 seconds is sufficient. The portion that has been part-coated is made of a resin that does not have heat-fusion properties, so the part-coating agent dissolves and part-coats the area. The portion where double-sided tape is attached does not have heat-fusion properties, so it remains in its original state.

[0053] Subsequently, by cutting the double bag 2-3 mm from the bottom, the first film 2 and the second film 3 form 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, thereby manufacturing a double bag 1. Cutting the double bag 2-3 mm from the bottom ensures reliable fusion of the bottom. Cutting the double bag 2-3 mm from the bottom ensures a reliable opening in the next double bag. The notch 8 is created by cutting the portion where the edge of the first surface connected to the opening line and the boundary between the second and third surfaces are heat-fused when cutting the double bag 1.

[0054] Furthermore, the double bag of the present invention can also be manufactured as follows. As shown in Figure 8, 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 does have heat-sealing properties.

[0055] Next, the back side of the first film 2 is placed on the back side of the second film 3. Double-sided tape is placed on the front surface of the first film 2, along the longitudinal edge of the film. Partial coating is applied to the upper and lower short edges of the first film 2, along the front surface of the first film 2. The back side of the third film 5 is placed on the front surface of the first film 2.

[0056] In this laminate of three films, the longitudinal directions of the back surface of the first film 2 and the back surface of the second film 3, one of the transverse directions of the back surface of the first film 2 and the back surface of the second film 3, and the longitudinal directions of the back surfaces of the first film 2, the second film 3 and the back surface of the third film 5 are heat-sealed together. After these steps, the double bag of the present invention can be manufactured by cutting and forming a notch portion 8.

[0057] 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. [Examples]

[0058] 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.

[0059] Next, the PET film surface was laser-processed to provide straight-cut properties. With the surface of the resulting laminated film 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 the portion where the first surface contacts 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, the boundary between the first and second surfaces, and the bottoms of the first and second surfaces were heat-sealed. A portion of one side with an opening line was cut off to create a notch.

[0060] Furthermore, by cutting the double bag 2-3 mm from the bottom, the first film and the second film form a storage section for holding articles, the surfaces of the first film, the second film, and the third film are printed, and the third film covers the surface of the first film, thus producing a double bag.

[0061] 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.

[0062] The packaged product is opened by opening the double bag horizontally from the notch. Because it has a straight-line cut, it could be opened along the opening line. On the side opposite the notch, opening stops before the double-sided tape. The upper edges of the first and second films are heat-sealed, and the first and third films are part-coated. Therefore, the portion cut along the opening line forms an annular resealable section. Furthermore, because the area between the first and third films is part-coated, it could be easily opened. By peeling off the double-sided tape between the first and third films, the printing on the surface of the first film could be confirmed. The third film could be resealed by reapplying the double-sided tape.

[0063] 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.

[0064] 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]

[0065] The present invention is suitably used, for example, in packaging for food, pesticides, cosmetics, and the like. [Explanation of Symbols]

[0066] 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. A notch for opening the double bag is 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, A double bag characterized in that the surface of the first film is provided with an adhesive portion for resealing the opening ends of the first film and the third film to the double bag.

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 the portion cut off by the aforementioned opening line constitutes an annular resealable portion.

4. The double bag according to claim 1, characterized in that the portion cut off by the aforementioned opening line forms a strip-shaped resealable portion.

5. 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. Apply double-sided tape to the portion of the first surface that contacts the edge of the third surface. The edge of the first surface and the boundary between the second and third surfaces, the boundary between the first and second surfaces, and the bottom of the first and second surfaces are heat-fused together. A method for manufacturing a double-layered bag.

6. 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 placed on top of each other, double-sided tape is placed along the longitudinal direction on the longitudinal edge of the surface of the first film, and a part-coat treatment is performed along the short direction of the upper and lower edges of the surface of the first film. The back surface of the third film is placed on the front surface of the first film. A method for manufacturing a double bag, comprising heat-sealing the longitudinal direction of the back surface of the first film and the back surface of the second film, one of the short directions of the back surface of the back surface of the first film and the back surface of the second film, and the longitudinal direction of the back surface of the first film, the back surface of the second film, and the back surface of the third film.

Images