Packaging bags

Abstract

To provide a packaging bag configured so that anyone can easily tear apart an opening part for opening the packaging bag to separate tips of a front face sheet and a back face sheet of the opening part from each other so as to open the bag.SOLUTION: A packaging bag (1) is constituted of sheets which have at least a paper layer (21), an adhesion layer (24) adjacent to the paper layer and a sealant layer (27), is formed by making sealant faces of the sheets, which are constituted of a front face sheet (2) and a back face sheet (3), oppose to each other and sealing peripheral edges thereof, and has opening scheduled lines (5) made of fragile lines in parallel to one side in the peripheral edge. Between at least the paper layer and the adhesion layer adjacent to the paper layer is formed, in a belt-like shape along the opening scheduled lines, a wood filling varnish layer (22) which contacts the paper layer and a peelable varnish layer (23). The opening scheduled lines are formed on the front face sheet and the back face sheet respectively, and the opening schedule line on one sheet is formed at a center of the peelable varnish layer on the other sheet.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a packaging bag for storing contents such as liquids, powders, granules, solids, etc., and which is opened by tearing one end of the bag. [Background technology]

[0002] When removing the contents from the packaging bag, if the front and back films at the opening that has been torn open remain in close contact with each other even after being torn, it is difficult to separate the films. In particular, if the front and back films are torn at the same height, even if you turn it over with your fingertips, it is difficult to grasp only one side of the film and separate it. Unless you hold it with wet hands, it is difficult to separate the container and opening it takes time. Even if you open it once, it is difficult to maintain the opening. If you open it with one hand and try to remove the contents with the other hand, it is difficult to remove them without maintaining the opening with one hand.

[0003] For example, in Patent Document 1, A self-supporting bag-like container formed by heat-sealing a laminate into a bag shape, The body of the container is formed by heat-sealing both side edge portions of the front and rear wall laminates with side seal portions, and the bottom is formed in a form having a gusset portion formed by folding back the bottom laminate inward and inserting it between the lower portions of the front and rear wall laminates, and then heat-sealing the bottom laminate; The wall laminate comprises a transparent plastic substrate and a base material having a basis weight of 70 to 280 g / m 2 a gas barrier laminate film and a heat seal layer, The bottom laminate is a self-supporting bag-like container that is characterized in that it is a laminate including a transparent plastic substrate and a heat seal layer.

[0004] This self-supporting bag-like container is made of a laminate including a paper base layer, and when opened, it is easy to maintain the open state. However, even if the opening portion is torn open, if the end heights of the front sheet and the back sheet are the same and in close contact, it is not possible to move the ends of the front sheet and the back sheet separately to separate them. For this reason, opening the opening wide to take out the contents is time-consuming even for young people. In particular, there is a problem in that it is difficult to efficiently take out the contents by opening the container opening with one hand and taking out the contents with the other hand. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2008-265854 A Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, an objective of the present invention is to obtain a packaging bag that is easy to open by separating the tips of the front sheet and back sheet of the opening portion, regardless of who tears the opening portion. [Means for solving the problem]

[0007] The packaging bag of the present invention is The sheet has at least a paper layer, an adhesive layer adjacent to the paper layer, and a sealant layer, and the sheets are used as a front sheet and a back sheet, and the sealant layer The two are placed face to face and the edges are sealed to form Be In the packaging bag, Between at least the paper layer and the adhesive layer in contact with the paper layer, One side of the periphery A sealing varnish layer is provided in a strip shape along the paper layer, and a release varnish layer is provided on the adhesive layer side of the sealing varnish layer. The front sheet is provided with a weakened line parallel to the one side of the periphery, , The above The opening schedule is The back sheet In the center of the peeled varnish layer In the corresponding position Setting was The packaging bag is characterized by the above. Effect of the Invention

[0008] The packaging bag of the present invention has a sealing varnish layer and a release varnish layer provided along the intended opening line between the paper layer and the adhesive layer in contact with the paper layer, so that the intended opening line is at the center of the band.This creates a step in the thickness direction when the bag is opened, and this step allows anyone to separate the tips of the front sheet and back sheet, allowing the bag to be opened to an opening portion that is easy to open. [Brief description of the drawings]

[0009] [Figure 1] 1 is a front view showing a packaging bag according to the present invention. [Diagram 2] 1A to 1C are diagrams showing a process for opening the packaging bag according to the present invention and a diagram showing the configuration of the front sheet in the vicinity of the intended opening line. [Diagram 3] 3A and 3B are enlarged vertical cross-sectional views of the opening portion of the packaging bag according to the present invention before and after opening by pushing and cutting. [Figure 4] 3A and 3B are enlarged longitudinal sectional views of the opening portion of the packaging bag according to the present invention before and after opening by pulling and tearing. [Diagram 5] 1 is a perspective view showing the appearance of a standing pouch according to the present invention in an opened state. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of the packaging bag of the present invention will be described with reference to the drawings. 1 is a front view showing an example of a standing pouch with a bottom sheet inserted into the bottom, in an embodiment of the packaging bag 1 according to the present invention. Of course, it does not have to be a standing pouch, and may be a general-purpose packaging bag sealed on four sides or a packaging bag sealed on three sides. The packaging bag 1 is formed by placing the sealant surfaces of a front sheet 2 and a back sheet 3 facing each other, with a top seal portion 11, a left seal portion 12, and a right seal portion 13 around the periphery, and a bottom seal portion 14 formed by folding a bottom sheet 4 with the sealant layer facing outwards and sandwiching it between the front sheet 2 and the back sheet 3 to form a gusset.

[0011] The packaging bag 1 has a top seal portion 11 parallel It has a straight line 5 for opening. Notches 51, 52 are provided on both the left and right ends of the intended opening line 5, and when opening the package, the upper part of the notch 52 can be grasped and torn as a trigger.

[0012] FIG. 2 is a diagram showing a process for opening the packaging bag 1 according to the present invention and a diagram showing the configuration of the front sheet in the vicinity of the intended opening line. FIG. 2-1 shows the process of gripping the upper part of the sheet above the notch 52 and starting to tear the gripped end of the sheet toward the user. The torn upper end of the front sheet 2 of the packaging bag 1 is at the same height as the intended opening line 5. However, the position at which the back sheet 3 is broken to open is located at a position sufficiently higher than the intended opening line 5 .

[0013] FIG. 2-2 is a diagram showing the configuration of the front sheet 2 in the vicinity of the intended opening line 5 in the first embodiment. The front sheet 2 is laminated in the following order from the outside: overprint varnish layer 212 / ink layer 211 / base material layer (paper base material layer) 21 / sealing varnish layer 22 / release varnish layer 23 / adhesive layer 24 / intermediate layer 25 / adhesive layer 26 / sealant layer 27. However, the ink layer 211 and the overprint varnish layer 212 are applied over the entire surface, while the sealing varnish layer 22 and the release varnish layer 23 are applied only in partial or localized areas, and in particular, the release varnish layer 23 is a strip-shaped layer of only a certain width. Here, an intended opening line 5 is applied deep in the thickness direction from the center of the ink layer 211. Here, half-punched perforations are applied. The end of the perforations is processed so as to reach the depth of the release varnish layer 23. The perforations may be in the shape of a V-shape.

[0014] FIG. 3 is an enlarged vertical cross-sectional view of the packaging bag 1 according to the present invention in the vicinity of the intended opening line 5 before and after opening by pushing and cutting. As shown in the cross section before opening in FIG. 3-1, the front sheet 2 and the back sheet 3 are fused together with the sealant layers 27 facing each other. The front sheet 2 and the back sheet 3 each incorporate a paper layer as a base layer, an intermediate layer, or the like. In the first embodiment, paper is used for the base layer 21 . A sealing varnish layer 22 is applied between the paper base layer 21 and the adjacent adhesive layer 24 on the paper base layer 21 side, and a release varnish layer 23 is provided in a strip shape on the adhesive layer 24 side above that. The opening line 5 formed by perforation is processed only on the front sheet 2 side, and is not processed on the back sheet 3 side. However, at the same position on the intended opening line 5, the back sheet 3 also has a sealing varnish layer 22 and a release varnish layer 23 processed in a band shape, and furthermore, is provided in the center of the coated portion of the band-shaped release varnish layer 23.

[0015] FIG. 3-2 shows a process of grabbing the sealed portion where the front sheet 2 and the back sheet 3 are fused together and pushing through the area above the intended opening line 5, which is processed by a perforation or the like. When an attempt is made to push through the upper part of the packaging bag 1, the front sheet 2 breaks at the intended opening line 5 on the side of the front sheet 2, and a large force is applied to the back sheet 3. Then, peeling begins at the release varnish layer 23, and a large force capable of breaking is applied to the area near the upper end forming the release varnish layer 23 of the back sheet 3, which force breaks the base layer 21, making it possible to open the bag. At this time, as described above, peeling occurs up to the top end of the peeling varnish layer 23, so the opening position shifts to the end and the package is opened. As a result, the breaking position of the front sheet 2 and the breaking position of the back sheet 3 are misaligned, and a step occurs between the front sheet 2 and the back sheet 3 when the package is opened. Due to the step, when the opened back sheet 3 is rubbed with a fingertip perpendicular to the opening line, the opening ends of the front sheet 2 and the back sheet 3 separate, and the front sheet 2 or the back sheet 3 can be caught separately. In this way, the back sheet 3 can be separated from the front sheet 2, so that the opening portion of the packaging bag 1 can be opened sufficiently large.

[0016] FIG. 4 is an enlarged vertical cross-sectional view of the packaging bag 1 according to the present invention in the vicinity of the intended opening line 5 before and after opening by pulling and tearing. Figure 4-1 is a cross-sectional view showing the state before opening by pulling and tearing, which is the same as the state before push-cutting in Figure 3. Figure 4-2 shows the process of grabbing the sealed part where the front sheet 2 and the back sheet 3 are fused together and pulling and tearing the part above the intended opening line 5, which is processed by a perforation or the like, towards you. When attempting to pull off the top of the packaging bag 1, a strong force is applied from behind the back sheet 3, pushing it towards the front sheet 2. At this time, peeling occurs at the release varnish layer 23 on the front sheet 2 side, and a large force is applied to the opening line 5 of the front sheet 2, and the front sheet 2 begins to break at the opening line 5 as if the force is being released. At this time, a large force is also applied to the back sheet 3, and a large breaking force is applied near the lower end where the release varnish layer 23 of the back sheet 3 is formed, and this force breaks the base layer 21, making it possible to open the package. At this time, as described above, peeling occurs up to the lower end of the peeling varnish layer 23, so that the opening position is shifted to the end portion when the package is opened. Because this difference in opening position creates a step, when the opened packaging back sheet 3 is rubbed with a fingertip perpendicular to the opening line, the opening ends of the front sheet 2 and the back sheet 3 separate, making it possible to grasp the front sheet 2 or the back sheet 3 individually. In this way, the front sheet 2 can be separated from the back sheet 3, so that the opening portion of the packaging bag 1 can be opened sufficiently large even by pulling it open.

[0017] FIG. 5 is an external perspective view showing the packaging bag 1 in an opened state. After the packaging bag 1 is opened and the upper end is pushed or pulled, the upper end of the packaging bag 1 is misaligned with the front sheet 2 side and the back sheet 3 side as shown in FIG. When the opened end face is touched vertically with a fingertip, only the end face of the high back sheet 3 can be touched and caught, so that the back sheet 3 can be separated from the front sheet 2, and the opened portion of the packaging bag 1 can be opened sufficiently large.

[0018] The base layer used in the laminate sheet constituting the packaging bag 1 of the present invention may be paper, an olefin-based resin film, a polyethylene terephthalate film, a polyamide film, or the like. When paper is used as the base layer, the basis weight is 30 g / m 2 ~200g / m 2 Paper of 50 g / m2 is used. 2 ~120g / m 2 This is a 30 g / m 2 The following papers require a thicker inner layer, but this would increase the proportion of plastic in the container, which would be environmentally problematic: 200g / m 2 This is because the above papers can cause problems such as excessive force being generated when torn, being too stiff and difficult to bend, which makes it difficult to make bags, having too high insulation properties which makes it difficult to fuse, and making the product expensive. Possible olefin resins include low-density polyethylene, medium-density polyethylene, linear low-density polyethylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ionomer resin, etc. Olefin resins are also difficult to break if they are too thick, so measures such as making them thin, using non-oriented resin films, or using uniaxially oriented films that are easy to break are required. When using a polyethylene terephthalate film or a polyamide film, it is advisable to use a thin film of 20 μm or less, or a film that can be cut in a straight line. If paper is not used for the base layer, paper is used for the intermediate layer. In that case, the basis weight is 30 g / m2 ~200g / m 2 It is recommended to use paper of this type.

[0019] The intermediate layer may also be made of paper, an olefin resin film, a polyethylene terephthalate film, a polyamide film, or the like. For paper, the basis weight is 30 g / m 2 ~200g / m 2 The use of paper is the same as for the base layer. The olefin resin film may be thin, a non-oriented resin film, or a uniaxially oriented film that is easily broken. Furthermore, polyethylene terephthalate film, polyamide film, etc. can be used as a barrier layer to improve the storage stability of the contents. In this case, it is advisable to use a thin film of 20 μm or less or a film with linear cutting properties.

[0020] The sealant layer is preferably made of a polyolefin resin. Specifically, polyolefin resins such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer (EVA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EAA), ionomer, and polypropylene can be used. These resins can be formed into a film using an extruder such as a T-die or inflation. It may be a single layer or multiple layers. The thickness of the film is preferably in the range of 50 to 200 μm. In particular, the use of a polyolefin resin having tearability further improves the cuttability.

[0021] For the adhesive layer, a dry lamination adhesive can be used, such as a two-component curing urethane adhesive, a polyester urethane adhesive, a polyether urethane adhesive, an acrylic adhesive, a polyester adhesive, a polyamide adhesive, or an epoxy adhesive. The adhesive can be used for lamination by a dry lamination method, or the sealant layer side may be laminated while forming a film using an extruder lamination machine, or may be sanded polyethylene processed.

[0022] The sealing varnish may be partially laminated with low density polyethylene, or polyvinyl alcohol or clay may be printed or applied with a coater. Below the top seal part, the opening line 5 is positioned as the center, and the top seal part is parallel Then coat.

[0023] The release layer is formed by applying a silicone-based release agent or a non-silicone-based release agent in a strip shape by printing or the like. Place it on a strip-shaped coated surface that has been coated with sealing varnish, align it with the height position where you want to process the opening line, and set the coating width so that it is wide enough to reach a height position where a sufficient step can be created.

[0024] In addition, if it is necessary to improve various physical properties of the laminate sheet, for example, when improving the rigidity, drop strength, puncture strength, etc. of the laminate sheet, or when improving the barrier properties against water vapor, oxygen gas, etc., a barrier layer can be provided.

[0025] The barrier layer may be, for example, an aluminum foil, an aluminum-deposited polyester film, an inorganic oxide-deposited polyester film, a polyamide film, etc. Of course, in order to laminate the barrier layer, it is possible to bond the layers together by a dry lamination method via an adhesive layer.

[0026] Examples of inorganic oxides that can be used for deposition include metal oxides such as silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, boron oxide, titanium oxide, lead oxide, zirconium oxide, and yttrium oxide. Among these, silicon oxide, aluminum oxide, and magnesium oxide are preferred from the standpoints of productivity and cost.

[0027] The bottom film may have the same structure as the front and rear films. However, from the viewpoint of ease of use and productivity, it is preferable to use a biaxially oriented film such as polyethylene terephthalate, polyamide, or polypropylene for the surface to be folded. It may be thinner than the front and rear films to facilitate smooth opening and closing.

[0028] The packaging bag of the present invention is as described above. By applying a sealing varnish and a release varnish between the paper base layer and the adhesive layer adjacent to the paper layer, with a width centered on the height of the intended opening line on the front sheet, a step is created at the breaking tips of the front sheet and back sheet, and this step makes it easy to open the bag. The packaging bag of the present invention can be easily manufactured by simply adding a process such as printing when stacking the sheets, and can be manufactured using general-purpose equipment, so the present invention has great advantages such as high productivity and low cost supply. [Explanation of symbols]

[0029] 1... Packaging bag 11 Top seal part 12 Left side seal 13 Right side seal 14 Bottom seal 2. Front sheet 21...Base layer (paper base layer) 211 Ink layer 212 Overprint varnish layer 22....Sealing varnish layer 23. Peeling varnish layer 24...Adhesive layer 25. Middle class 26...Adhesive layer 27 Sealant layer 3. Rear seat 4. Bottom sheet 5. Opening line 51...Notch (left) 52...Notch (right)

Claims

1. A packaging bag is formed by forming a sheet having at least a paper layer, an adhesive layer adjacent to the paper layer, and a sealant layer, the sheets being used as a front sheet and a back sheet, the sealant layers facing each other, and sealing the periphery, Between at least the paper layer and the adhesive layer in contact with the paper layer, a sealing varnish layer in contact with the paper layer is provided in a strip shape along one side of the periphery, and a release varnish layer is provided on the adhesive layer side on the sealing varnish layer, The front sheet is provided with a weakened line parallel to the one side of the periphery, A packaging bag characterized in that the intended opening line is provided at a position corresponding to the center of the release varnish layer strip on the back sheet.

2. A packaging bag as described in Claim 1, characterized in that the intended opening line consists of a straight weakened line parallel to the one side of the periphery, and has a notch at its end.

3. The paper layer has a basis weight of 30 to 200 g / m ２ 3. The packaging bag according to claim 1 or 2,

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