JP2012025453A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag using a shape-retaining plastic wire rod, which can be manufactured in a general heat sealing condition.SOLUTION: The self-supporting bag includes: a surface material 2 and a back-face material 3 which are formed by arranging two laminates each having at least a base material and a sealant layer to face each other with the sealant layers inside; a bottom material 4 formed by bending one laminate having at least a base material and a sealant layer with the sealant layer outside; and bottom seal portions 26, side seal portions 25 and a top seal portion 24 formed by inserting the bottom material 4 between the surface material 2 and the reveres material 3. In a rectangular area which is parallel to a line 22 for opening provided below the top seal portion 24 and partially or entirely includes the side seal portions 25 at both lateral ends, the shape-retaining plastic wire rod 5 of a multilayer structure having a thermoplastic resin layer of the same system as the sealant layer laminated thereon is arranged on at least surfaces in contact with the sealant layers of the surface and back-face materials by thermal fusion with the sealant layers of the surface material 2 and the back-face material 3.

Description

  The present invention relates to a packaging bag for storing contents such as confectionery, powdered food, etc., and in particular, the opening shape of the opening can be maintained, so that the contents can be easily taken out and inserted into a main body container. The present invention relates to a packaging bag having a function as a replacement container to be used.

  Conventionally, a variety of material configurations, shapes, and structures are known for packaging bags formed by molding soft packaging materials. In general packaging bags, there is no function to keep the opened opening in an open state, and there is a nature of always trying to close it, so the contents are in powder form and it is necessary to take out using a spoon etc. In some cases, it was inconvenient.

  The packaging container having a cup function, which is the application of the applicant described in Patent Document 1, has a notch on the opening side of the packaging container formed by heat-sealing a plastic film or plastic and another base material composite film. A packaging container having a cup function in which a plastically deformable base is provided on the lower side along an opening portion that is provided and opened from the cut portion.

  Since the packaging container described in Patent Document 1 has a plastically deformable base at the opening, the opening can be kept open, and the contents can be directly attached to the packaging container. It will function as a cup when you take it.

  Patent Document 1 describes that a plastically deformable material such as a hard aluminum plate or a plastically deformable material such as a synthetic resin is used as a plastic deformable base material. It is not easy to adhere to the soft packaging material to be constructed, and it is necessary to use special adhesive means, so the manufacturing process is complicated, and therefore the packaging container becomes expensive, and from a practical point of view, it is a problem. was there. Further, when a metal is used as the material of the base, there is a problem that it takes time and effort to separate it at the disposal stage.

  The packaging bag which is also filed by the same applicant described in Patent Document 2 is composed of a laminated material having at least a base material layer and a sealant layer, and one side inner surface of the packaging bag having an unsealed portion on one side of the bag body portion or A packaging bag comprising a shape-retaining plastic wire having a predetermined shape that is heat-sealed in parallel to the unsealed portion at a position close to the unsealed portion on both inner surfaces.

  In this packaging bag, since the shape-retaining plastic wire is arranged not on the entire surface in the width direction of the bag but on a part thereof, it has been difficult to arrange the wire in the bag making process. In addition, since the wire does not extend over the entire length in the width direction, the opening cannot be opened greatly, and the shape of the opening is restricted, and when trying to use it for a replacement container, the shape of the main body container is limited. There was a problem.

  The chucked pouch described in Patent Document 3 and also filed by the applicant is made of a laminated material obtained by laminating at least a film base layer and a sealant layer from the outer surface, and the sealant layers are opposed to each other. The left and right edge portions and the upper and lower edge portions of the two laminated materials superposed on each other are heat-sealed in a pouch shape, and one of the upper and lower edge portions serving as the opening of the pouch In the vicinity of the inside of the seal portion, as a means for opening the pouch, a cutting line and notches are provided at both ends thereof, and a chuck that can be opened and closed is provided on the inner surface near the inside of the cutting line. The chuck is a pouch with a chuck, wherein the chuck is made of a linear resin having shape memory performance.

  The purpose of both the packaging bag described in Patent Document 2 and the pouch with chuck described in Patent Document 3 is to maintain the opening state of the opening portion, and the purpose has been achieved to some extent, The contents can be taken out more easily.

Japanese Utility Model Publication No. 56-75144 JP 2008-105679 A JP 2008-222287 A

  The plastic deformable synthetic resin described in Patent Document 1, the shape-retaining plastic wire described in Patent Document 2, or the linear resin having shape memory performance described in Patent Document 3 are all melt temperatures. Therefore, when trying to weld with a thermoplastic resin layer that is used as a sealant layer for general soft packaging materials by heat melting, the soft packaging material is wrinkled or, in extreme cases, the packaging material The problem of melting and breaking was likely to occur, and the workability was extremely poor.

  The problem to be solved by the present invention is to solve a conventional problem in a packaging bag using a shape-retaining plastic material and to provide a packaging bag using a shape-retaining plastic wire that can be manufactured under normal heat sealing conditions. It is to provide.

As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that two laminates having at least a base material and a sealant layer face each other with the respective sealant layers facing each other, and a surface material and On the other hand, a laminate having at least a base material and a sealant layer is folded with the sealant layer facing outward to form a bottom material, and the bottom material is inserted between the surface material and the back material, A self-supporting bag formed with a seal part, a side seal part, and a top seal part, which is cut along a planned opening line provided at the bottom of the top seal part to form an opening and is parallel to the planned opening line And a thermoplastic resin layer similar to the sealant layer on at least a surface in contact with the sealant layer of the front and back surface materials in a rectangular region including a part or all of the side seal portions on both the left and right sides of the surface material and the back surface material The shape-retaining plastic wire of a multi-layer structure are stacked, a packaging bag, characterized in that arranged by thermal fusion with the respective sealant layer of surface material and the back material.

  The invention according to claim 2 is a position where the shape-retaining plastic wire disposed in the sealant layer of the surface material and the shape-retaining plastic wire disposed in the sealant layer of the back surface do not overlap. The packaging bag according to claim 1, wherein the packaging bag is arranged in a package.

  Further, the invention according to claim 3 is a replacement container that is used by being inserted into the main body container while holding the opening of the opening of the packaging bag. It is.

The packaging bag according to the present invention is a self-supporting bag made of a laminate having at least a base material and a sealant layer, and part or all of the side seal portions at the left and right ends of the surface material and the back surface material are parallel to the planned opening line. Since the shape-retaining plastic wire is disposed in the rectangular region including the opening, the opening can be held in an open state after opening, and the operability when taking out the contents is good.

  In addition, the shape-retaining plastic wire is arranged by heat fusion with the respective sealant layers of the front surface material and the back surface material, so that it is more productive and manufactured than the conventional method using an adhesive. Cost can be kept low.

  In addition, the shape-retaining plastic wire is a multilayer structure, and a thermoplastic resin layer similar to the sealant layer is laminated on at least the surface contacting the sealant layer of the front and back materials. Can be heat-sealed under sealing conditions that are not significantly different from the normal sealing conditions for sealing the sealing portion of the packaging bag, which is extremely advantageous in terms of the manufacturing process.

  In addition, when the shape-retaining plastic wire arranged in the sealant layer of the front material and the shape-retaining plastic wire arranged in the sealant layer of the back material are arranged at positions that do not overlap, the front and back surfaces Since the shape-retaining plastic wires attached to the material can be overlapped and the thickness of the packaging bag can be prevented from becoming extremely thick, it is easy to pack when transporting unfilled packaging bags, improving transport efficiency. There is an advantage in terms of goodness.

  Moreover, since the packaging bag which concerns on this invention can be inserted and used for a main body container in the state which hold | maintained the opening of the opening part of a packaging bag, it can be used conveniently for the use used as a replacement container.

  Since the packaging bag after use does not use a metal wire, there is no need to dispose of it separately, it can be folded and reduced in volume, and it has good environmental compatibility.

FIG. 1 is a schematic view showing an embodiment of a packaging bag according to the present invention. FIG. 2 is a schematic cross-sectional view showing the A-A ′ cross section of FIG. 1. FIG. 3 is an explanatory cross-sectional view showing the arrangement of shape-retaining plastic wires in the packaging bag according to the present invention. FIG. 4 is a schematic view showing another embodiment of the packaging bag according to the present invention. FIG. 5 is a schematic cross-sectional view showing the B-B ′ cross section of FIG. 4. FIG. 6 is a schematic view showing an example of a replacement container using the packaging bag according to the present invention.

The packaging bag according to the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a schematic view showing an embodiment of the packaging bag 1 according to the present invention, and FIG. 2 is a schematic cross-sectional view showing the AA ′ cross section of FIG. FIG. 3 is an explanatory sectional view showing the arrangement of the shape-retaining plastic wire 5 in the packaging bag 1 according to the present invention.

The packaging bag 1 according to the present invention has two laminates 10 having at least a base material 11 and a sealant layer 12 facing each other with the sealant layer 12 facing inside to form a surface material 2 and a back material 3. A single laminate having at least a base material and a sealant layer is bent with the sealant layer facing outward to form a bottom material 4, and the bottom material 4 is inserted between the surface material 2 and the back material 3, and the bottom seal portion 26 The self-supporting bag is formed by forming the side seal portion 25 and the top seal portion 24.

  The packaging bag 1 according to the present invention forms an opening 21 by cutting along a planned opening line 22 provided at a lower portion of the top seal part 24, and is parallel to the planned opening line 22, and has a surface material 2 and a back surface. A thermoplastic resin layer 14 similar to the sealant layer 12 is laminated at least on the surface in contact with the sealant layer 12 of the front and back materials in a rectangular region including part or all of the side seal portions 25 at both left and right ends of the material 3. The shape-retaining plastic wire 5 having a multilayer structure is arranged by heat-sealing with the respective sealant layers 12 of the front surface material 2 and the back surface material 3.

  As shown in FIG. 3, the shape-retaining plastic wire 5 used in the packaging bag according to the present invention has a multilayer structure in which a shape-retaining plastic 13 and a thermoplastic resin layer 14 similar to the sealant layer 12 are bonded together. . For this reason, the sealant layer 12 of the laminate 10 forming the packaging bag and the thermoplastic resin layer 14 can be easily heat-sealed under normal heat-sealing conditions, and have special high-temperature and high-pressure conditions. Since there is no need to take it, there is no fear that the laminated body 10 will be wrinkled or the laminated body 10 will melt and deform.

  Since the packaging bag 1 according to the present invention has the shape-retaining plastic wire 5 disposed in the immediate vicinity of the opening 21, it is possible to easily hold the opening 21 in a greatly opened state. Further, since the shape-retaining plastic wire 5 is disposed in a rectangular region including a part or all of the side seal portions 25 at both left and right ends, the opening is compared with the case where the shape-retaining plastic wire 5 is disposed only in the central portion not including the side seal portions 25. The openability of the part 21 increased.

  Highly stretched high-density polyethylene resin (HDPE) is known as the shape-retaining plastic 13 having shape-retaining properties, such as stretched HDPE (trade name) Technoroto made by Mitsui Chemicals, and Sekisui Molding Industry ( (Product name) Forte is on the market.

  As a method of bonding the thermoplastic resin layer 14 to the shape-retaining plastic 13, a known dry laminate bonding method can be used. The laminated material can be bonded to the laminate 10 in a bag-making process in which the material is slit into a predetermined width and processed into a tape shape to form a packaging bag.

  The planned opening line 22 is an imaginary line obtained by extending the opening notch 23 and may not have a specific shape, or may be displayed by printing. In addition, it can be physically scratched, or it can be half-cut with a laser.

  As the laminated body 10 used for the packaging bag 1 which concerns on this invention, the material generally used for a flexible packaging bag can be used. As the substrate 11, paper, metal foil, or synthetic resin film composed of one layer or several layers is used. For example, low density polyethylene resin (LDPE), high density polyethylene resin (HDPE), linear low density polyethylene resin (LLDPE), polypropylene resin (PP), polyolefin resin such as polyolefin elastomer, polyethylene terephthalate resin (PET), polyester resins such as polybutylene terephthalate resin (PBT), polyethylene naphthalate resin (PEN), cellulose resins such as cellophane and cellulose triacetate (TAC), polymethyl methacrylate (PMMA) resin, ethylene- Vinyl acetate copolymer resin (EVA), ionomer resin, polybutene resin, polyacrylonitrile resin, polyamide resin, polystyrene resin (PS), polyvinyl chloride resin (PVC), polyvinylidene chloride Resin (PVDC), polycarbonate resin (PC), fluorine-based resin, synthetic resin films and paper, such as urethane resin, a metal foil or the like alone or be used in combination. The base material 11 includes a printing layer and an adhesive layer as necessary.

  As the paper, high-quality paper, piece art paper, coated paper, cast coated paper, imitation paper, and the like can be used. It is also effective to use paper from the viewpoint of environmental considerations.

  In addition to the metal foil described above, a known gas barrier film, an inorganic vapor deposition film, or the like may be added to the substrate 11 in order to impart gas barrier properties.

  As the sealant layer 12, a polyolefin resin is generally used. Specifically, a low density polyethylene resin, a medium density polyethylene resin, a linear low density polyethylene resin, an ethylene / vinyl acetate copolymer, an ethylene / α Ethylene resins such as olefin copolymers, polypropylene resins such as homopolypropylene resins, propylene / ethylene random copolymers, propylene / ethylene block copolymers, and propylene / α olefin copolymers are used. In addition, a multilayer film in which these resins are combined may be used.

  Specific examples of the structure of the laminate include a film composed of PET / printing layer / adhesive layer / stretched polyamide resin film (hereinafter abbreviated as ONY) / adhesive layer / LLDPE, and ONY / adhesive layer / LLDPE. , ONY / adhesive layer / ONY / adhesive layer / LLDPE, paper / LDPE / aluminum foil / LDPE, paper / LDPE, and the like.

  FIG. 4 is a schematic view showing another embodiment of the packaging bag according to the present invention. FIG. 5 is a schematic cross-sectional view showing the B-B ′ cross section of FIG. 4. In the embodiment shown in FIGS. 4 and 5, the shape-retaining plastic wire 5 disposed in the sealant layer 12 of the surface material 2 and the shape-retaining plastic wire 5 disposed in the sealant layer 12 of the back surface material 3 are provided. It is characterized by being arranged at a position that does not overlap. By doing so, there is a feature that the shape-retaining plastic wires 5 do not overlap each other and the packaging bag 1 does not have to be bulky. For this reason, when the packaging bag 1 before filling the contents is transported or set in a filling machine, there are advantages in terms of transport efficiency and space efficiency.

FIG. 6 is a schematic view showing an example of a replacement container using the packaging bag 1 according to the present invention. This example is a powdered milk container for infants, which has a metal main body container 30 and a lid 31, and can accommodate the packaging bag 1 according to the present invention as a replacement container. Since the shape-retaining plastic wire 5 is disposed in the immediate vicinity of the opening 21, the packaging bag 1 can be held in a state where the opening 21 is largely opened after opening in accordance with the opening of the main body container 30. The content 32 is easy to take out.
Hereinafter, according to an Example, the packaging bag which concerns on this invention is demonstrated more concretely.

As the laminated body 10 constituting the packaging bag 1, a laminated film having the following constitution was created.
Base material 11: Polyethylene terephthalate (PET) resin film (thickness 12 μm) / printing ink / dry laminate adhesive / aluminum foil (thickness 7 μm)
Sealant layer 12: linear low density polyethylene (LLDPE) resin (thickness 70 μm)
Bonding of base material and sealant layer: As a dry laminate adhesive shape-retaining plastic wire 5, a material having the following constitution was prepared.
Shape-retaining plastic: Super-stretched high-density polyethylene resin (Forte made by Sekisui Molding Co., Ltd., thickness 400 μm)
Thermoplastic resin: LLDPE (thickness 30 μm)
Bonding: Dry laminate adhesive <Manufacturing process>
1. A pattern printing process was performed on the treated surface of the PET film.
2. The printed surface of 1 PET film and aluminum foil were laminated by dry lamination, and the corona-treated surface of the aluminum foil and sealant layer was further dry laminated.
3. After the shape-retaining plastic sheet and LLDPE were dry-laminated, they were slit to a width of 6 mm to obtain a shape-retaining plastic wire 5.
4 and 2 are used as the surface material 2, the back surface material 3, and the bottom material 4, and the bottom material and the bottom material between the front and back materials 2, 3 by a three-side seal bag making machine capable of inserting a chuck. 4 and the shape-retaining plastic wire 5 were inserted, and the standing pouch of Example 1 was obtained while thermally bonding.

<Comparative Example 1>
A standing pouch was prepared in the same manner as in Example 1 except that the shape-retaining plastic wire was not inserted in the bag making process.

<Comparative example 2>
In the bag making process, a standing pouch was prepared in the same manner as in Example 1 except that when the shape-retaining plastic wire was inserted, the wire was inserted into an area not including the side seal portion.

Each packaging bag obtained as described above was filled with the following contents, and the suitability for actual use was evaluated.
(A) Filled with snacks and sealed. The hermetic seal portion was cut off and opened to evaluate the ease of taking out the contents.
(B) Filled with infant formula and sealed. The sealing part is cut and opened, and the whole bag is inserted into the metal can as the main body container 30 as shown in FIG. The ease of taking out milk when scooping milk from a bag with a measuring spoon was evaluated.

  As can be seen from the results in Table 1, since the packaging bag according to the present invention can maintain the opening of the opening portion, it can impart the suitability for taking out the contents, and mainly foods such as snacks and powdered foods. It is excellent as a packaging bag for all contents and as an alternative container for cup containers. If it is desired to reseal during use, the unsealed part can be closed again and used as a storage container.

  Moreover, when inserting this packaging bag in a main body container as a replacement container to a main body container, the takeout property of the contents can be provided by sticking an opening part to the inner wall of a main body container. This makes it possible to replace infant milk powder and other soft drinks that are concerned about refilling the contents directly into the main body container from the standpoint of hygiene, and reduce the volume from the main body container and suitability for handling. Improvement can be imparted.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Surface material 3 ... Back surface material 4 ... Bottom material 5 ... Shape retention plastic wire 10 ... Laminated body 11 ... Base material 12 ... Sealant Layer 13: Shape-retaining plastic 14 ... Thermoplastic resin layer 21 ... Opening 22 ... Opening line 23 ... Opening notch 24 ... Top seal part 25 ... Side seal part 26 ... Bottom seal part 30 ... Main body container 31 ... Cover 32 ... Contents

Claims (3)

  Two laminates having at least a base material and a sealant layer are opposed to each other with the respective sealant layers facing inside to form a surface material and a back material, while one laminate having at least a base material and a sealant layer. A self-standing bag formed by bending the sealant layer outside to form a bottom material, and inserting the bottom material between the front surface material and the back surface material to form a bottom seal portion, a side seal portion, and a top seal portion. The opening is formed by cutting along the planned opening line provided at the lower part of the top seal portion, and the side seal portions on both the left and right sides of the front surface material and the back surface material are partially or parallel to the planned opening line. A shape-retaining plastic wire having a multilayer structure in which a thermoplastic resin layer similar to the sealant layer is laminated on at least the surface in contact with the sealant layer of the front and back surfaces in a rectangular region including all of the surface material Packaging bag, characterized in that arranged by thermal fusion with the respective sealant layers of backing material and.   The shape-retaining plastic wire disposed in the sealant layer of the front surface material and the shape-retaining plastic wire disposed in the sealant layer of the back surface material are disposed at positions that do not overlap. The packaging bag according to 1.   The packaging bag according to claim 1 or 2, wherein the packaging bag is a replacement container that is used by being inserted into the main body container while the opening of the opening portion of the packaging bag is held.

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