JP2019031307A - Self-standing packaging bag - Google Patents

Abstract

To provide a packaging bag which has high shape-retaining force, is formed by bonding plastic films which can be cleanly piled in a vertical direction to be formed.SOLUTION: A packaging bag 1 in which film laminated bodies are faced and bonded to each other to provide a storage space inside has: a top surface 30 and a bottom surface 20 of an approximately rectangle or polygon; and a side surface 10 which surrounds a periphery of the top surface and the bottom surface. The side surface consists of a front surface 11 and a back surface 12. An end edge at a side of the bottom surface of the front surface and the back surface forms a bottom ridge part 15 projecting in a normal direction of the bottom surface from the bottom surface, bonded to a peripheral part of the bottom surface to go around the bottom surface. An end edge at a side of the top surface of the front surface and the back surface similarly forms a top ridge part 16. Left and right end edges of the front surface and the back surface are bonded respectively to form a side edge seal part 13, and the side edge seal part is provided from the top ridge part to the bottom ridge part of the side surface. A weakened line 33 is provided on at least a part of the top surface, and a re-sealable re-closing member 40 covering a part of the weakened line is mounted to the top surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging bag formed by laminating laminated films of plastic resin, and more particularly to a packaging bag that has high self-supporting property and shape retention and can be easily and neatly stacked during display and storage.

  Packaging pouches, also called pouches, are widely used as single-layer or laminated bodies based on plastic film, and various forms are used for a wide range of applications and are indispensable for modern life. It has become a thing.

  For example, in addition to beverages, it is widely used in food fields such as retort foods, and in the daily necessities and toiletries fields, various products are packed in the shelves of supermarkets, drug stores, and convenience stores. In addition to liquid containers, various applications have been developed.

  The advantages of packaging bags are that they are less expensive than containers such as cans and bottles, can be handled with fine material design depending on the required quality, or are lightweight and space-saving before filling, distribution and storage. Can be mentioned.

  In addition, high-definition printing on the layer visible from the surface can improve the image of the product and display necessary information about the contents. Bar code printing is used for product distribution and marketing. It is also a source of information.

  On the other hand, such a packaging bag also has a problem. For example, Patent Document 1 discloses a packaging bag having a shape called a pillow packaging bag, which can be easily opened with a small force. However, since pillow packaging bags are composed of a single or laminated body based on plastic film, the outer shape is not fixed, and the top and bottom are not clearly formed like paper boxes and metal cans. The shape retention was low, and it was difficult to neatly stack it during distribution, storage, and display in stores.

  In addition to pillow packaging bags, packaging bags made of plastic film are also widely used in the form of standing pouches with widened bottoms and gusset pouches with gussets on the sides to increase thickness. Although these packaging bags are used, the top and bottom surfaces are not clearly formed, and it has been difficult to stack, distribute, store and display them neatly.

  In addition to the packaging bags made of plastic film, in the conventional packaging form, for example, paper boxes that are easy to stack are time-consuming to assemble, and in the case of contents containing moisture and oil like snacks Has the problem of using special oil-resistant paper or requiring a separate inner bag because moisture and oil will permeate into the paper. In the case of metal cans, the degree of freedom in shape is low and heavy. However, there was a problem of cost, and it was an obstacle to substitute.

JP-A-2006-113214

  The present invention was made to solve the problems of the prior art as described above, and in a packaging bag configured by laminating a laminated film of plastic resin, the top and bottom surfaces can be clearly formed, It is another object of the present invention to provide a self-supporting packaging bag in which the formed top surface and bottom surface have strength, high shape retention, can be stacked neatly in the top-and-bottom direction, and the contents can be easily taken out.

In order to solve the above problems, the invention according to claim 1 of the present invention provides:
A packaging bag in which a sealant layer of a film laminate having at least a base material layer and a sealant layer is bonded to each other so as to provide a storage space therein, the top and bottom surfaces having a substantially rectangular or polygonal shape, and the top A side surface surrounding the periphery of the bottom surface and the bottom surface, the side surface includes a front surface and a back surface, and the bottom surface side edge of the front surface and the back surface protrudes in a normal direction of the bottom surface from the bottom surface, and A bottom ridge portion that is bonded to a peripheral edge portion of the bottom surface and circulates around the bottom surface is formed, and edges on the top surface side of the front surface and the back surface protrude in a normal direction of the top surface from the top surface. The top edge is bonded to the peripheral edge of the top surface to form a top ridge, and the left and right edges of the front surface and the back surface are bonded together to form a side edge seal portion, and the side edge The seal part is the ridge part of the side A re-closure member that is provided over the bottom ridge, is provided with a weakening line on at least a part of the top surface, and covers the portion where the weakening line is provided, and is mounted on the top surface. It is a self-supporting packaging bag characterized by being made.

The invention according to claim 2 of the present invention is
The self-supporting packaging bag according to claim 1, wherein the film laminates forming the side surface, the top surface, and the bottom surface are separate bodies.

The invention according to claim 3 of the present invention is
The film laminate is continuous at the boundary between the side surface, the top surface, and the bottom surface, and the bottom ridge portion and the top ridge portion are folded and bonded to the vicinity of the boundary portion. The self-supporting packaging bag according to claim 1, wherein the self-supporting packaging bag is formed in a ridge shape.

The invention according to claim 4 of the present invention is
The self-supporting packaging bag according to any one of claims 1 to 3, wherein the reclose member is a sheet-like adhesive seal lid material.

The invention according to claim 5 of the present invention is
2. The reclose member is an overcap formed of a plastic resin, has a slit groove that fits at least part of the top ridge, and covers the top surface. To the self-supporting packaging bag according to any one of 3 to 4.

According to the first aspect of the present invention, a plurality of film laminates are bonded to the bottom ridge and the top ridge protruding in the normal direction from the substantially rectangular or polygonal bottom and top, respectively. In the aspect, because it is formed thicker than other parts and circulates around the periphery of the bottom surface and the top surface, the formed bottom ridge and top ridge have higher rigidity, and the bottom ridge and top ridge are surrounded by The shape of the top surface and the bottom surface of the embodiment surrounded by the film is less likely to collapse, and the left and right side edge seal portions with the thickness formed by pasting the film laminate constituting the front surface and the back surface at the left and right edges are provided. Since it extends from the bottom ridge portion to the top ridge portion to enhance the rigidity and shape retention in the vertical direction, a self-supporting packaging bag with high shape retention can be provided as a whole. In particular, the shape of the top and bottom is not easily collapsed, and it is almost rectangular or polygonal. Packaging bags can be provided.

  Further, at least a part of the top surface is provided with a weakening line, and the top surface is opened by tearing the weakening line by pulling both ends in a direction perpendicular to the top surface weakening line, The stored contents can be taken out, and a reclosing member that can be resealed to cover the area where the weakened line is provided is mounted on the top surface. A self-supporting packaging bag that can be stopped can be provided.

  Further, according to the invention described in claim 2, since the film laminates that form the side surface, the top surface, and the bottom surface are separate bodies, the configuration of the laminated film that forms each surface according to the contents and required characteristics of the packaging bag Both the bottom ridge and top ridge are thickened by bonding the edge and bottom of the side, and the peripheral edge of the top, and then cover either edge with the other edge. Thus, the laminated film can be tripled by being folded and bonded together, and a bottom ridge portion and a top ridge portion with higher rigidity can be formed.

  According to the invention described in claim 3, since the packaging bag can be constituted by a single laminated film in which the film laminated body is continuous at the boundary between the side surface, the top surface, and the bottom surface, the packaging bag is manufactured. The bottom ridge portion and the top ridge portion can be easily formed into a ridge shape by simply folding and bonding the film laminate in the vicinity of the boundary portion, and can be manufactured more efficiently.

  According to the invention described in claim 4, since the reclose member is a sheet-like adhesive seal lid material, it is easy to peel off and reseal, and further, the top surface is extended to the side surface on the extension of the weakening line. When it is opened with a large cut, it can be resealed by crushing the top surface in a straight line in the direction parallel to the weakening line and sticking the adhesive seal lid material peeled off at the time of opening across the top edge it can.

  According to the invention described in claim 5, since the slit portion and the top ridge portion of the overcap formed by plastic resin are fitted and firmly attached to cover the top surface, The shape retention can be further improved, and it is possible to stack the packaging bags more easily, and it is possible to stack them cleanly, and the overcap is fitted with the top ridge so that there is no gap. It is possible to reduce the number, and it is possible to reseal the opened packaging bag by attaching an overcap.

It is a see-through | perspective perspective view of one Embodiment of the self-supporting packaging bag of this invention. It is a cross-sectional schematic diagram of the top surface of one Embodiment of the self-supporting packaging bag of this invention, and its vicinity. It is a cross-sectional schematic diagram of the top | upper surface of 2nd embodiment of the self-supporting packaging bag of this invention, and its vicinity. It is an external appearance schematic diagram of a mode that one Embodiment of the self-supporting packaging bag of this invention is opened. It is the schematic diagram of a mode that opened the top | upper surface of one Embodiment of the self-supporting packaging bag of this invention large. It is a schematic diagram of a mode that the self-supporting packaging bag of this invention opened like FIG. 5 is resealed. It is an external appearance schematic diagram of the overcap with which the self-supporting packaging bag of this invention is mounted | worn. It is an external appearance schematic diagram of the aspect which mounted | wore the self-supporting packaging bag of this invention with the overcap. It is a schematic diagram of the state which accumulated the self-supporting packaging bag of FIG. It is a figure which shows the outline | summary of the formation procedure of 1st embodiment of the self-supporting packaging bag of this invention. It is a figure which shows the outline | summary of the formation procedure of 2nd embodiment of the self-supporting packaging bag of this invention. It is a figure which shows the outline | summary of the formation procedure of another aspect of 2nd embodiment of the self-supporting packaging bag of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, components that are substantially the same are denoted by the same reference numerals and description thereof may be omitted. Further, the present invention is not construed as being limited to the following embodiments.

  FIG. 1 is a perspective perspective view of an embodiment of the self-supporting packaging bag of the present invention (hereinafter sometimes simply referred to as a packaging bag). FIG. 2 is a schematic cross-sectional view of the top surface and its vicinity of one embodiment of the self-supporting packaging bag of the present invention. The self-supporting packaging bag 1 of the present embodiment includes a pair of plastic resin film laminates having at least a base material layer 111 and a sealant layer 113 and provided with an intermediate layer 112, a front film 11 constituting the front surface, and a back surface. As the back film 12 constituting the front film 11, the bottom edge and the top edge of the back film 12 are the edge (not shown) of the bottom film 21 constituting the bottom face 20 and the top face constituting the top face 30. The bottom ridge portion 15 and the top ridge portion 16 are formed by bonding the edge portion 32 of the film 31 and the sealant layer 113 so as to face each other, and the left and right edges of the front film 11 and the back film 12 are side edges. Sealed at the seal portions 13 and 13 and bonded together.

  At this time, the edge portion 32 of the top surface film 31 forms the top ridge portion 16 and forms a fold portion 17 that is folded in a triangular shape on the bottom surface side in a portion close to the side edge seal portion 13. Since the left and right end portions 18 are sandwiched between the side edge seal portions 13 and sealed together, the top surface 30 is substantially rectangular. The same applies to the bottom film 21, and a substantially rectangular bottom surface 20 is formed. A cylindrical side surface 10 is formed by the front film 11 and the back film 12. The bottom film 21 and the top surface film 31 may be polygonal shapes such as hexagons and octagons, and the bottom surface 20 and the top surface 30 may similarly be hexagons and octagons.

  The bottom ridge portion 15 and the top ridge portion 16 are erected on the periphery of the bottom surface 20 and the top surface 30, respectively. As shown in FIG. 2, the top ridge 16 is an aspect in which the edges of the front film 11 and the back film 12 and the edge 32 of the top film 31 are overlapped and bonded. At this time, one film may be bonded so as to cover the end of the other film. Although the top film 31 has at least a base film 311 and a sealant layer 313 and is provided with an intermediate layer 312, other appropriate layers such as a printing layer can be provided. Although not particularly shown, a known adhesive may be used as appropriate. Bonding can be performed by appropriately applying a known bonding method. For example, methods such as dry lamination, hot melt lamination, and wet lamination can be applied, but are not limited thereto. Although the details of the configuration of the bottom film 21 are not shown, they are the same as the top film 31.

  The top ridge portion 16 formed by bonding as described above has a shape in which two laminated films are substantially bonded, has a thickness that is thicker than the other portions, and has a higher rigidity. Since the ridge portion 16 having a high rigidity surrounds the periphery in a frame shape, the shape retaining property as a surface is high. Although not shown in detail, the bottom surface 20 is also surrounded by a rigid bottom ridge portion 15 in the shape of a frame, so that shape retention is high.

  Further, side edge seal portions 13 and 13 are provided at the left and right ends of the side surface 10 from the bottom ridge portion 15 to the top ridge portion 16, and the front film 11 and the back film 12 are attached to the side edge seal portions 13 and 13. In addition, since the bottom film 21 and the end 18 of the top film 31 are also bonded to each other, the thickness is thick and the rigidity is high, so that a force is applied to the packaging bag 1 in the top-and-bottom direction. In addition, the shape is hard to collapse and the shape retention is improved.

The top surface film 31 is provided with a weakening line 33 at least at a part thereof, and when the contents are stored, an outlet for taking out the contents can be formed by tearing the weakening line 33. The weakening line 33 can be provided in a part or all of the layers constituting the top film, and the method is appropriately adopted from known methods such as perforation, half cut, laser irradiation processing, scratch processing, and the like. Can be provided. Alternatively, a perforation may be provided in the center, and both sides may be combined with laser irradiation processing up to the side edge seal portion 13. In addition, when the adhesive seal cover 40 having at least the base material 41 and the adhesive layer 43 is adhered as a reclosing member that covers the weakening line 33 and can be resealed, and the perforation is provided over the entire layer However, the packaging bag 1 can be sealed, and the weakened line is prevented from being accidentally opened. Other layers such as the intermediate layer 42 may be laminated on the adhesive seal lid member 40.

  FIG. 3 is a schematic view showing a state where the packaging bag 1 provided with the adhesive seal lid member 40 is opened. The adhesive seal lid 40 is peeled off, and the end of the top ridge 16 in the direction perpendicular to the weakening line 33 is pulled as shown by a black arrow, whereby the weakening line 33 is cut and the top surface form 31 has an opening 34. Is formed. For example, as shown in FIG. 4, the top surface film 31 can be cut by proceeding to the both sides of the weakened line 33 and cutting until the side edge seal portions 13 and 13 are reached. Can be opened greatly, and the contents 60 can be easily taken out.

  In addition, since the adhesive seal lid member 40 is adhered to the top surface film 31 by the adhesive layer 43, it has resealability that allows it to be adhered again after sealing once and sealed. For example, by crushing the top side that is greatly opened as shown in FIG. 4 flatly as shown in FIG. 5 and re-adhering the adhesive seal lid material 40 peeled off at the time of opening so as to straddle the ridge 16 The packaging bag 1 can be resealed.

  FIG. 6 is a schematic cross-sectional view of the top surface and the vicinity of the second embodiment of the self-supporting packaging bag of the present invention. In the present embodiment, the back film 12, the top film 31 provided with the weakening line 33, the front film 11, and the bottom film (not shown) are constituted by a continuous laminated film, and the back film 12, The vicinity part of each boundary of the top | upper surface film 31 and the front surface film 11 is bend | folded and bonded together, and the ridge 16 is formed. An adhesive seal lid member 40 is adhered to the weakened wire 33 in the same manner as in the above-described embodiment. Although not shown, the bottom ridge is similarly formed by bending a portion near the boundary between the bottom film, the front film 11 and the back film 12. Also in such an aspect, the top ridge part 16 becomes an aspect in which two laminated films are overlapped, and the shape retaining property of the packaging bag 1 is enhanced as in the above-described embodiment.

  FIG. 7 is a schematic external view of an overcap 50 formed by molding a plastic resin, which is another embodiment of the resealable reclose member of the self-supporting packaging bag of the present invention. An outer frame 51 is erected on the peripheral edge of the top plate 52 having substantially the same shape as the top surface 30, and a plurality of guide plates 53 are erected with a gap 54 between the outer frame 51. . As shown in FIG. 8, the overcap 50 is detachably mounted so that the top ridge 16 and the side edge seal portion 13 are housed inside the outer frame 51, and the top ridge 16 is fitted in the gap 54. Then, the overcap 50 is held on the top surface 30.

  Since the overcap 50 is mounted so as to house the top ridge portion 16 and the side edge seal portion 13 inside, the top surface 30 becomes more difficult to be deformed and becomes unintentionally weak during handling such as transportation and display. The possibility that the line 33 is torn off can be reduced. Moreover, since the overcap 50 formed by molding a plastic resin has higher shape retention than the film laminate and the flatness of the top plate 52 is also high, for example, a large number of packaging bags 1 are stacked as shown in FIG. Sometimes it is possible to stack more stably.

The number and position of the guide plates 53 may be set as appropriate according to the shape of the top surface. For example, if the top surface is substantially rectangular, it is preferable to provide the guide plates 53 at the four corners as illustrated in FIG. The gap 54 may be appropriately set according to the thickness of the top ridge portion 16 so that it can be easily fitted and has an appropriate holding force. It goes without saying that the overcap 50 can be attached to any of the self-supporting packaging bags of the first embodiment and the second embodiment of the present invention.

  Each embodiment of the self-supporting packaging bag of the present invention can be formed by a forming procedure as outlined in FIGS. 10 and 11.

  FIG. 10 is a perspective view for explaining the formation procedure of the first embodiment of the present invention. In FIG. 10, the top surface film in which the weakening lines 33 are provided at the top edges of the front film 11 and the back film 12. 31, the bottom film 21 is sandwiched between the bottom edge edges, and the edge 32 of the top film 31 and the top edge edges of the front film 11 and the back film 12 are bonded together to form the top ridge 16. The bottom edge 15 is formed by bonding the peripheral edge 22 and the bottom edges of the front film 11 and the back film 12 together. Next, the left and right side edge portions are pressed and bonded so as to be crushed in the front-rear direction as indicated by arrows, thereby forming side edge seal portions 13 and 13.

  When the side edge seal portion 13 is formed, the bottom film 21 is crushed into an inverted V shape, and the top surface film 31 is crushed into a V shape and is sandwiched between the side edge seal portions 13 and 13 and sealed together. The Therefore, the bottom film 21 in the portion adjacent to the side edge seal portions 13 and 13 is drawn in an inverted V shape, and the top film 31 is drawn in a V shape, so that the folding portion 17 as shown in FIG. 1 is formed. At the same time, the bottom surface 20 and the top surface 30 are formed in a substantially rectangular shape or a polygonal shape such as a hexagon that is slightly crushed.

  FIG. 11 is a perspective view for explaining the formation procedure of the second embodiment of the self-supporting packaging bag of the present invention. In the present embodiment, the back film 121, the top film 31 provided with the weakening line 33, the front film 11, and the bottom film 21 are constituted by a continuous laminated film, and the bottom film 21 is again the back film 122. It is continuous. The back film 121 continuing to the top film 31 and the back film 122 continuing to the bottom film are bonded together by the back seal portion 120 to form the back film 12 as a unit. The portions near the boundaries of the back film 121, the top film 31, the front film 11, the bottom film 21, and the back film 122 are folded and bonded to form the top ridge portion 16 and the bottom ridge portion 15. The formation of the side edge seal portions 13 and 13 is the same as the formation procedure shown in FIG.

  FIG. 12 is a perspective view for explaining another configuration of the second embodiment of the self-supporting packaging bag of the present invention. In this configuration, the top surface film 31, the front film 11, the bottom film 21, and the back film 12 provided with the weakening line 33 are configured by a continuous laminated film, and one part A of the top ridge portion 16. It is made into the form pasted together. The part to be bonded is not limited to the part A, and may be an aspect in which the other ridge part 16 or the bottom ridge part 15 is bonded.

  Hereinafter, the member which comprises the self-supporting packaging bag of this invention is demonstrated concretely.

(Film laminate)
The film laminated body which comprises the side surface of the self-supporting packaging bag of this invention, a top | upper surface, and a bottom face has a base material layer and a sealant layer, and can provide an intermediate | middle layer between them.
The base layer is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.) Polyimide or the like can be used and is appropriately selected according to required characteristics. In particular, when polypropylene or polyethylene terephthalate is used as a base film, it is more preferable in terms of film strength and price. The thickness is not particularly limited, but is preferably 12 μm, for example.

  The intermediate layer is provided for improving various strengths and barrier properties of the packaging bag 1 and can be appropriately selected from a plastic film, a metal foil, or the like according to the purpose. If it is a plastic film, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, etc. can be used. Are appropriately selected. In particular, when a polyamide film is used, it can be more preferably used in terms of mechanical strength, impact resistance, stiffness, and the like of the packaging bag. If it is metal foil, aluminum foil can be used conveniently. In the case of using aluminum foil, it can be used more preferably in terms of barrier properties such as moisture resistance in addition to increasing mechanical strength and stiffness, and the thickness in the case of aluminum foil is not particularly limited, but for example 7 μm Is preferred. Moreover, in order to provide barrier property, it is good also as a structure which provided the vapor deposition film | membrane of a metal or an inorganic oxide in the film which forms a base material layer.

  As a material for the sealant layer, a polyolefin-based resin is generally used among thermoplastic resins. Specifically, a low-density polyethylene resin, a medium-density polyethylene resin, a linear low-density polyethylene resin, and ethylene-vinyl acetate are used. Polymers, ethylene-α olefin copolymers, ethylene resins such as ethylene-methacrylic acid resin copolymers, blend resins of polyethylene and polybutene, homopolypropylene resins, propylene-ethylene random copolymers, propylene-ethylene Polypropylene resins such as block copolymers and propylene-α olefin copolymers can be used. The thickness is not particularly limited, but is preferably, for example, 30 μm.

(Other layers)
In addition to the above layers, a layer may be additionally provided as appropriate in the middle, for example, a printing layer may be provided. The printed layer is provided so as to be visible from the outside of the packaging bag for displaying information on the contents, for identification, or for the purpose of improving design. The printing layer can be provided using a plastic film as the base material, and there are no particular restrictions on the printing method and printing ink. From among the known printing methods, printability to the film, design properties such as color tone, and adhesion For example, a gravure printing method, an offset printing method, a gravure offset printing method, a flexographic printing method, an ink jet printing method, or the like can be used. Of these, the gravure printing method can be preferably used in terms of productivity and high definition of the pattern.

(Lamination and adhesion)
When each layer constituting each film laminate is laminated, the layers can be laminated via an adhesive layer. As a material for the adhesive, for example, a polyester-isocyanate resin, a urethane resin, a polyether resin, or the like can be used. As a lamination method, dry lamination or non-solvent lamination can be used. Or when using a thermoplastic resin, it can also laminate using an extruder.

(Adhesive seal cover)
The pressure-sensitive adhesive cover material is formed by providing a pressure-sensitive adhesive layer with a paper or plastic film as a base material, and an intermediate layer may be provided therebetween. As a base material, if it is a plastic film, it can select suitably according to a required characteristic from the thing similar to what was illustrated by the above-mentioned film laminated body, Although thickness is not specifically limited, For example, 12 micrometers is suitable. The pressure-sensitive adhesive layer should be provided using a pressure-sensitive adhesive appropriately selected from the rubber-based pressure-sensitive adhesive, acrylic pressure-sensitive adhesive, silicon-based pressure-sensitive adhesive, urethane-based pressure-sensitive adhesive, etc. according to the required properties such as the properties of the contents and the peel strength. Although the thickness is not particularly limited, for example, 30 μm is preferable. The intermediate layer can be provided for adjusting the strength of the lid member and the adhesiveness between the base material and the pressure-sensitive adhesive. For example, a layer made of polyolefin resin (block polypropylene resin or the like) can be provided with a thickness of 15 μm. Moreover, in order to improve barrier property, an intermediate | middle layer can also be used as aluminum foil, Although the thickness is not specifically limited, For example, it is suitable if it is 7 micrometers. As another configuration for improving the barrier property, a so-called barrier film in which an inorganic oxide vapor deposition layer is provided on a base material may be employed and an adhesive layer may be laminated. Although the thickness of a barrier film is not specifically limited, For example, it can be 12 micrometers.

(Over cap)
The overcap can be formed by injection molding of a plastic resin. As the plastic resin, high-density polyethylene, medium-density polyethylene, low-density polyethylene, a copolymer resin of polyethylene and polypropylene, an ethylene vinyl acetate copolymer, and a polypropylene resin can be used, but not limited thereto. The polypropylene resin may be a block copolymer or a random copolymer.

  As described above, according to the self-supporting packaging bag of the present invention, in the packaging bag that is alerted by laminating the film laminate, the top surface, the bottom surface can be clearly formed, and the formed top surface, It is possible to provide a self-supporting packaging bag in which the bottom surface has a sufficient strength, has a high shape retaining force, and can be neatly stacked in the vertical direction. In addition, it has a weakening line on the top surface, and the contents can be taken out by opening the top surface from the site of the weakening line. It can be easily re-sealed. Table 1 compares the characteristics of the self-supporting packaging bag of the present invention and the conventional packaging container. As shown in Table 1, the self-supporting packaging bag of the present invention exhibits excellent characteristics in many characteristics.

DESCRIPTION OF SYMBOLS 1 ... Self-supporting packaging bag 10 ... Side surface 11 ... Front film 12, 121, 122 ... Back film 120 ... Back seal part 13 ... Side edge seal part 15 ... Bottom Ridge part 16 ... Ceiling ridge part 17 ... Folding part 18 ... End part 20 ... Bottom face 21 ... Bottom film 22, 32 ... Peripheral part 30 ... Top face 31 ... Top film 33 ... Fragile line 40 ... Adhesive seal lid material 50 ... Overcap 51 ... Outer frame 52 ... Top plate 53 ... Guide plate 54 ... Gap 60 ... ·Contents

Claims (5)

  A packaging bag in which a sealant layer of a film laminate having at least a base material layer and a sealant layer is bonded to each other so as to provide a storage space therein, the top and bottom surfaces having a substantially rectangular or polygonal shape, and the top A side surface surrounding the periphery of the bottom surface and the bottom surface, the side surface includes a front surface and a back surface, and the bottom surface side edge of the front surface and the back surface protrudes in a normal direction of the bottom surface from the bottom surface, and A bottom ridge portion that is bonded to a peripheral edge portion of the bottom surface and circulates around the bottom surface is formed, and edges on the top surface side of the front surface and the back surface protrude in a normal direction of the top surface from the top surface. The top edge is bonded to the peripheral edge of the top surface to form a top ridge, and the left and right edges of the front surface and the back surface are bonded together to form a side edge seal portion, and the side edge The seal part is the ridge part on the side surface A re-closure member that is provided over the bottom ridge, is provided with a weakening line on at least a part of the top surface, and covers the portion where the weakening line is provided, and is mounted on the top surface. A self-supporting packaging bag characterized by being made.   The self-supporting packaging bag according to claim 1, wherein the film laminates forming the side surface, the top surface, and the bottom surface are separate bodies.   The film laminate is continuous at the boundary between the side surface, the top surface, and the bottom surface, and the bottom ridge portion and the top ridge portion are folded and bonded to the vicinity of the boundary portion. The self-supporting packaging bag according to claim 1, wherein the self-supporting packaging bag is formed in a ridge shape.   The self-supporting packaging bag according to any one of claims 1 to 3, wherein the reclose member is a sheet-like adhesive seal lid material.   2. The reclose member is an overcap formed of a plastic resin, has a slit groove that fits at least part of the top ridge, and covers the top surface. The self-supporting packaging bag according to any one of items 1 to 3.