JP5659578B2 - Packaging material and manufacturing method thereof - Google Patents

Description

  The present invention relates to a packaging material for obtaining a package in which food solids are vacuum-filled and a method for producing the same.

  Among food solids, for example, frozen hamburgers are packaged by storing hamburgers as solids in the packaging material and then sealing the packaging material in a vacuum state, that is, vacuum packaging. The package is then frozen by rapidly cooling the food solids that are contained in the package, shipped in this frozen state, and sold through a distribution process. The vacuum packaging is a packaging form that is often used conventionally since it can maintain the freshness of the filling. However, when such a vacuum packaged package is chilled by freezing, the inside of the package is reduced in volume at the time of vacuum packaging, so that the embedded material and the packaging material come into contact with each other, and are frozen in that state. As a result of rapid cooling of the inner material, condensation occurs on the surface of the packaging material, and a large amount of frost is generated. Moreover, frost may adhere not only at the time of manufacture of a chilled package but in the process of distribution of a package.

  When frost adheres to the surface of the package, it is difficult to visually recognize the display of the contents or the like attached to the surface of the packaging material of the package during the distribution and sale of the package. In this case, the function of displaying the contents of the packaging material cannot be sufficiently achieved.

  It has excellent transparency, and can be made into a film that does not crush food when pressure is applied to the food. It is disclosed that a container capable of range heating is a package that is vacuum-packed with a transparent water-impermeable film that is covered in close contact, and this transparent film is a laminated film containing an ionomer resin (patent) Reference 1).

JP 2006-327658 A

  However, the generation of frost in the rapidly cooled vacuum package could not be sufficiently prevented only by using a specific laminated film as the film constituting the packaging material as described above.

  The present invention advantageously solves the above-mentioned problem, and in the case of obtaining a vacuum package, the packaging material printed during rapid cooling of the inclusions during chilling or during the circulation of the package It is an object of the present invention to provide a packaging material that can suppress frost from adhering to the surface and thus ensure the visibility of the printed display on the surface of the packaging material.

  The packaging material of the present invention that advantageously solves the above problems includes a bag portion that contains an embedded material, and a film portion that is partially bonded to the surface of the bag portion, wherein the bag portion is at least It is a three-sided bag formed by heat-sealing the edge of two laminates having a base layer and a heat seal layer, and the film part is composed of a single laminate having at least a base layer and a heat seal layer The film part is a heat seal layer of the laminate of the film part, and the other part of the bag part through a gap formed in an edge part of the laminate of the bag part in contact with the film part. The heat seal layer of the laminate of the sheets is heat-sealed and joined to the bag portion at the four corners of the film portion, and the bag portion and the film portion communicate with the atmosphere.

A method for producing a packaging material according to the present invention is a method for producing the packaging material described above , wherein one of the two laminates constituting the bag portion and having at least a base layer and a heat seal layer is formed. A hole is formed in the edge, and the two laminates are overlaid so that the heat seal layers are in contact with each other, and the laminate having at least a base layer and a heat seal layer is formed as a heat seal. The layers are superposed so as to be in contact with the surface of the laminate in which the holes are formed, and the edges of the laminate constituting the overlapped bag portion and film portion are heat-sealed.

According to the packaging material of the present invention, the film portion is joined to the surface of the bag portion, and the space between the bag portion and the film portion communicates with the atmosphere. Even if dew is formed and frost is generated, the surface of the bag portion where the frost is generated is separated from the film portion on which printing is performed, so that frost is not generated and attached to the film portion. For this reason, the visibility of the printed display on the surface of the packaging material can be maintained.
According to the method for producing a packaging material of the present invention, the packaging material of the present invention can be produced with high productivity.

It is a perspective view of the packaging material of one Embodiment of this invention. It is an exploded sectional view of the packaging material of one embodiment of the present invention. It is a disassembled perspective view of the packaging material of one Embodiment of this invention.

  Hereinafter, embodiments of the packaging material of the present invention will be specifically described with reference to the drawings.

  In the perspective view shown in FIG. 1, the packaging material 1 includes a bag portion 11 having a rectangular plane. This bag part 11 is for accommodating the filling material in the packaging material 1. A rectangular film portion 12 having a length smaller than that of the bag portion 11 is partially joined to the surface of the bag portion. More specifically, in the example shown in FIG. 1, the film portion 12 is partially joined to the bag portion 11 by hole-shaped seal portions 12 s formed in the vicinity of the four corners of the rectangular film portion 12. On the surface of the film part 12, it is possible to display the contents of the contents contained in the packaging material 1 attached by printing.

  As described above, the bag portion 11 and the film portion 12 are partially joined, so that the atmosphere communicates between the bag portion 11 and the film portion 12. Thereby, even if the surface of the bag part 11 is condensed by freezing of the inclusions contained in the bag part 11 and vacuum-packed, and the frost is generated, the surface of the bag part 11 where the frost is generated, Since it is separated from the film part 12 to be printed, frost is not generated and attached to the film part 12. For this reason, the visibility of the printed display attached | subjected to the film part 12 surface which comprises the packaging material 1 can be maintained.

  The packaging material 1 of the present embodiment is particularly effective when the filling material accommodated in the bag portion 11 is vacuum-packed and frozen in the bag portion 11 such as a hamburger. .

  In the packaging material of FIG. 1, the bag part 11 includes two laminated bodies 11 </ b> A and laminated bodies 11 </ b> B each including a base layer 11 a and a heat seal layer 11 b. Since the laminated body 11A and the laminated body 11B have the heat seal layer 11b, the laminated body 11A and the laminated body 11B can be joined by heat fusion to manufacture the bag part 11, and thus the productivity of the bag part 11 is improved. Good. Moreover, these laminated bodies 11A and 11B are overlapped so that both surfaces facing each other are the heat seal layer 11b, and heat-bonding is performed by heating and pressing the edges of the three sides that are overlapped. The bag portion 11 is a three-sided bag. The bag portion 11 is a three-sided bag in which two films of the laminates 11A and 11B having at least the base layer 11a and the heat seal layer 11b are joined at the respective edges. Since the packaging material 1 which can accommodate a filling can be manufactured with high productivity, it is preferable.

  Of the laminated body 11A and the laminated body 11B constituting the bag part 11, the laminated body 11A on the side in contact with the film part 12 has a notch or a hole formed at the edge that is thermally fused to the laminated body 11B. It is preferable. By having a notch or a hole in the edge portion of the laminated body 11A, the heat seal layer 11b of the laminated body 11B of the bag portion 11 is connected to the heat seal layer 12b of the laminated body of the film portion 12 through the notch or hole. It can be heat-sealed.

  Specific examples of the base layer 11a and the heat seal layer 11b constituting the laminate 11A and the laminate 11B of the bag part 11 include, for example, a combination in which the base layer 11a is a polyamide-based resin and the heat seal layer 11b is a heat-sealable resin. There is.

  The laminated body 11A and the laminated body 11B are not limited to the example including two layers of the illustrated base layer 11a and heat seal layer 11b. If it has at least the base layer 11a and the heat seal layer 11b, it may be an example of a configuration having three or more layers in total. For example, there is a combination of [polyethylene resin / polyamide resin / heat-sealable resin].

  Moreover, it can also be set as a laminated body by joining the base layer 11a and the heat seal layer 11b with an adhesive agent. The following structures are mentioned as a typical structural example of the laminated | multilayer film which can be used preferably. However, it is not limited to these configurations, and various combinations of laminated films can be used. In the following, the ON film is a biaxially stretched nylon film, the OPP film is a biaxially stretched polypropylene film, the PET film is a biaxially stretched polyethylene terephthalate film, and L / LDPE is a linear low density polyethylene. HDPE refers to high density polyethylene, LDPE refers to low density polyethylene, CPP film refers to cast (unstretched) polypropylene film, and EVOH film refers to saponified ethylene-vinyl acetate copolymer film.

(1) ON film / adhesive / L / LDPE film (sealant layer)
(2) ON film / adhesive / PET film / adhesive / L / LDPE film (sealant layer)
(3) ON film / adhesive / PET film / adhesive / CPP film (sealant layer)
(4) ON film / adhesive / biaxially stretched HDPE film / adhesive / L / LDPE film (sealant layer)
(5) ON film / adhesive / OPP film / adhesive / L / LDPE film (sealant layer)
(6) ON film (silica or alumina deposited layer) / adhesive / biaxially stretched HDPE film / adhesive / L / LDPE film (sealant layer)
(7) ON film / anchor coat layer / co-extrusion coat layer (HDPE) layer / L / LDPE layer) (sealant layer is L / LDPE layer)
(8) ON film / anchor coat layer / co-extrusion coat layer (HDPE layer / LDPE layer) / adhesive / L / LDPE film (sealant layer)
(9) PET film / adhesive / L / LDPE film (sealant layer)
(10) PET film / adhesive / ON film / adhesive / L / LDPE film (sealant layer)
(11) PET film / adhesive / (silica or alumina deposited layer) ON film / adhesive / L / LDPE film (sealant layer)
(12) PET film / adhesive / ON film / adhesive / CPP film (sealant layer)
(13) PET film / adhesive / EVOH film / adhesive / ON film / adhesive / CPP film (sealant layer)

  In the above, the anchor coat is a kind of primer coat which is pre-coated on the base film side in order to improve the adhesiveness when the resin is laminated by extrusion coating.

  In the above, the L / LDPE film and the CPP film of the sealant layer can be replaced with an ethylene / α-olefin copolymer polymerized using a single site catalyst. As described above, these sealant layers can be laminated by an extrusion coating method or the like in addition to pasting a film formed in advance using an adhesive by a dry lamination method or the like.

  In the configuration of the laminated film, the ON film and the PET film, when used for the outermost layer, impart mechanical strength and printability to the food bag as the base film, and when used for the intermediate layer, are mainly mechanical. Used to reinforce mechanical strength. In addition, the biaxially stretched HDPE film and OPP film used for the intermediate layer are used for increasing the thickness and rigidity, and at the same time improving the moisture permeability. The biaxially stretched HDPE film and OPP film can also be a uniaxially stretched HDPE film and a uniaxially stretched PP film. In that case, by laminating so that the stretch direction matches the direction of the cut line of the bag. , Tearing can be facilitated and the directionality can be stabilized. However, it is preferable to use a biaxially stretched film when the cut line of the bag is in both the vertical and horizontal directions of the bag.

  The silica or alumina vapor deposition layer and the EVOH film are laminated to improve the gas barrier property. Besides these, a gas barrier material such as a polyacrylonitrile film or a coating layer of polyvinylidene chloride is used. It can also be laminated.

  As the sealant layer, three examples of L / LDPE film, CPP film, and ethylene / α-olefin copolymer polymerized using a single site catalyst were given. It is excellent in stability, content resistance, stress cracking resistance, etc., and the CPP film is excellent in heat resistance and low odor. In addition, ethylene / α-olefin copolymers polymerized using single-site catalysts such as metallocene catalysts have a narrow molecular weight distribution and a stable copolymerization ratio. In addition to excellent properties, it is particularly excellent in low odor. Therefore, by selecting and using the optimum product according to the type of packaging (food) to be packaged and usage conditions, the flavor of the content is not impaired by resin odor, etc., and it is safe and has excellent performance. A food bag can be provided.

  In addition to the above, the sealant layer also contains ordinary low-density polyethylene such as high-pressure polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, ionomer, and polyester resin. It can be appropriately selected and used.

  Moreover, the laminated body 11A and the laminated body 11B are not limited to the example which is a laminated body with the same structure of a layer. That is, the laminated body 11A and the laminated body 11B may have different types of base layers 11a and / or heat seal layers 11b. The laminated body 11A may have any configuration as long as a base film and a heat-sealable film are laminated, and the laminated body 11B has a base film and a heat-sealable film that can be printed and decorated by back printing. If it does, a structure will not ask | require.

  The film part 12 partially joined to the bag part 11 is preferably made of a laminate having at least a base layer 12a and a heat seal layer 12b. For example, there are a combination of [polyethylene resin / heat sealable resin], a combination of [polyamide resin / heat sealable resin], and a combination of [polyethylene resin / polyamide resin / heat sealable resin]. The base layer of the film part 12 is a layer that can be printed and decorated by reverse printing.

  The heat seal layer 11b of the laminate 11A and / or the laminate 11B of the bag part 11 and the heat seal resin of the heat seal layer 12b of the laminate of the film part 12 can be melted by heat and fused to each other. For example, as a thermoplastic resin, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic Ethylene acid copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polyolefin resin such as polyethylene or polypropylene, acrylic acid, methacrylic acid, maleic anhydride Modified with acids, fumaric acid and other unsaturated carboxylic acids Acid-modified polyolefin-based resin, the other one or resin comprising two or more resins may be used in the form of a film or sheet.

  As can be seen from the schematic exploded cross-sectional view of the packaging material 1 shown in FIG. 2, the film portion 12 is formed at the edge of the laminated body 11 </ b> A that is a laminated body on the side in contact with the film portion 12 in the bag portion 11. The laminated body 11B of the bag portion 11 can be bonded by heat fusion through a hole 11h or a gap formed by a notch. This joint portion is the seal portion 12s shown in FIG. The film part 12 is joined to another laminated body of the bag part 11 by thermal fusion via a gap (hole 11h in FIG. 2) at the edge of the laminated body 11A, so that the sealing part 12s is previously attached to the laminated body 11A. Since the film part 12 and the bag part 11 can be partly joined by thermal fusion only by providing the gap to be, the packaging material 1 can be manufactured with high productivity.

  Seal portions 12 s that partially join the bag portion 11 and the film portion 12 can be provided at the four corners of the film portion 12. Considering joining of the bag part 11 and the film part 12 by thermocompression bonding, the side edge part of the bag part 11 in which the laminated body 11A and the laminated body 11B are heat-sealed in order to form the bag part 11 of the three-sided bag. 12s can be provided continuously or intermittently along the line, but the frost adherence to the printed display formed on the film part 12 by communicating between the bag part 11 and the film part 12 with the atmosphere. In view of the prevention, it is preferable to reduce the number of seal portions 12s as much as possible so that the above-described communication with the atmosphere is good. Therefore, it is preferable that the seal portions 12 s are provided at the four corners of the film portion 12.

  Next, an embodiment of the method for manufacturing a packaging material of the present invention will be described.

  As shown in the exploded sectional view of the packaging material shown in FIG. 2 and the exploded perspective view shown in FIG. 3, a laminated body 11 </ b> A for the bag part 11, a laminated body 11 </ b> B, and a laminated body for the film part 12 are prepared. These laminates are not limited to short pieces for manufacturing the packaging material 1 in a batch type, but may be long ones for manufacturing the packaging material 1 in a continuous type. The film portion 12 is displayed with contents and the like by printing. Moreover, the display of content etc. can be attached | subjected also to the laminated body 11B by printing.

A hole 11h is formed in the vicinity of the edge of the laminated body 11A for the bag 11. This can be a punch hole by punching.

  Next, the laminated body 11A and laminated body 11B for the bag part 11 and the laminated body for the film part 12 are overlapped. At this time, the heat seal layer 11b of the stacked body 11A and the heat seal layer 11b of the stacked body 11B are overlapped so as to face each other. Moreover, it superimposes so that the heat seal layer 12b of the laminated body of the film part 12 may contact | connect the base layer 11a of the laminated body 11A.

Next, the laminated body 11A, the laminated body 11B, and the laminated body for the film part 12 for the stacked bag part 11 were heated with a heater and pressed in the thickness direction to be heat-sealed. Thereafter, this heat-sealed portion is cooled by a cooler and solidified. By performing this heat-sealing at the edges of the three sides of the stacked laminate, the three-side bag portion 11 and the film portion 12 partially joined to the surface of the bag portion 11 by the seal portion 12s. Is obtained. The heater and cooler for heat fusion are respectively provided in a direction parallel to the traveling direction of the laminated body and a direction perpendicular to the laminated body when each laminated body is a long object unwound from a roll. Thus, a large number of packaging materials can be produced continuously as the laminate progresses.
According to the manufacturing method as described above, the packaging material of the present invention can be manufactured with high productivity.

  Next, the packaging material of the present invention will be described more specifically with reference to examples.

Example 1
[Production of film part laminate]
A laminate having a sealant layer (thickness: 60 μm) made of a low-density polyethylene film as a heat seal layer was obtained on a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm to which decorative printing by back printing was applied.

[Preparation of laminate of bag part]
A laminate was obtained by laminating a low-density polyethylene film having a thickness of 60 μm with a dry laminate adhesive on a polyamide film having a thickness of 15 μm. By stacking two of these laminates with the heat seal layers inside, a three-sided bag can be obtained by heat sealing.

[Production of packaging materials]
Punch holes were formed in the vicinity of the edge of the bag laminate. Next, the two laminated bodies for bag parts and the laminated body of the film part 12 were piled up. At this time, the heat seal layer of the laminate of the film part was superposed so as to contact the laminate of the bag part.

  Next, the two laminated bodies for the bag part and the edge part of the laminated part for the film part are heated with a heater and pressed in the thickness direction to heat-fuse them, and then the heat fusion is performed. The landing part is cooled by a cooler and solidified. By carrying out this heat fusion at the edges of the three sides of the stacked laminate, the bag part of the three-sided bag and the film part partially joined to the surface of this bag part via the punch hole The provided packaging material was obtained.

(Comparative Example 1)
Comparative Example 1 is a general chilled packaging material and is an example in which the film portion in the packaging material of Example 1 is not provided.

  A film having a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and a sealant layer made of a low-density polyethylene film having a thickness of 60 μm is provided on the surface to which the decorative printing is applied. A two-sided laminate obtained by laminating with a dry laminate adhesive was heat-sealed with the sealant layers of each laminate inside each other to obtain a three-sided packaging material of Comparative Example 1.

(Comparative Example 2)
Comparative Example 2 is an example in which the packaging material is a double sealed bag.

  The above-mentioned cosmetic printing was applied to a film having a 12 μm-thick biaxially stretched polyethylene terephthalate film to which decorative printing by back printing was applied and a sealant layer (thickness 60 μm) by a low-density polyethylene film. A laminate for the outside was obtained by laminating with a dry laminate adhesive on the surface. Moreover, the laminated body for inner side was obtained by laminating | stacking the low-density polyethylene film of thickness 60 micrometers, the polyamide film of thickness 15 micrometers, and the low-density polyethylene film of thickness 60 micrometers with a dry laminate adhesive. Two of the laminates for the inner side were overlapped with each other so that the heat seal layers were inside. After stacking the two outer laminates on the outside of the laminated inner laminate so that the heat seal layers of each other are inside, heat-sealing to obtain a complete double sealed bag It was. In this double sealed bag, air does not communicate between the outer laminate and the inner laminate, and air is always interposed between the outer laminate and the inner laminate. .

(Comparative Example 3)
Comparative Example 3 is a comparative example, except that air is slightly communicated between the outer laminate and the inner laminate by forming holes in the outer laminate in the double sealed bag of Comparative Example 2. This is an example similar to Example 2.

The holes were formed in the outer laminate under the conditions of a hole diameter of 0.3 mm and a hole density of 64 holes / cm ² .

(test)
Using the packaging materials of Example 1 and Comparative Examples 1 to 3, the following tests were performed.

(1) Appearance change test The hamburger was vacuum-filled, and after boiling, 10 samples were stored in a refrigerator at minus 10 ° C, and the appearance change was observed.

(2) Drop strength test The retort-treated packaging body produced by the above method is dropped from the height of 120 cm onto the concrete surface once in the horizontal and vertical directions (twice in total). The presence or absence of leakage was confirmed.

(3) Puncture strength test The contents are taken out from the retort-treated packaging body produced by the above method, and a needle having a diameter of 1 mmφ is pierced from the surface of the laminate at a piercing speed of 200 mm / min, and the needle penetrates the film. The strength (N) required for the measurement was measured.

  The results of the above test are shown in Table 1. As is apparent from Table 1, the packaging material of Example 1 shows excellent properties in a well-balanced manner in all items of appearance change after retorting, drop strength and puncture strength as compared with the packaging materials of Comparative Examples 1 to 3. It was.

  Although the packaging material and the manufacturing method thereof of the present invention have been specifically described using the embodiments and examples, the packaging material and the manufacturing method of the present invention are limited to the descriptions of these embodiments and examples. Without departing from the spirit and scope of the present invention, various modifications are possible. For example, in the present invention, the shape of the packaging material is preferably rectangular or square from the viewpoint of productivity of the packaging material, but the shape is not limited to rectangular or square. In short, it is a packaging material in which the film part is partially joined to a part of the surface of the bag part, and communicates with the atmosphere between the bag part and the film, and is applicable to vacuum packaging and freezing packaging. Any packaging material that can be printed on a film has the above-described effects of the present invention.

DESCRIPTION OF SYMBOLS 1 Packaging material 11 Bag part 11a, 12a Base layer 11b, 12b Heat seal layer 12 Film part

Claims (2)

A bag portion for storing the filling,
A film part partially joined to the surface of the bag part,
The bag portion is a three-sided bag formed by heat-sealing the edge of two laminates having at least a base layer and a heat seal layer,
The film portion is composed of a single laminate having at least a base layer and a heat seal layer,
The film part is another sheet of the bag part through a heat seal layer of the laminated body of the film part and a gap formed in an edge part of one laminated body in contact with the film part of the bag part. The heat seal layer of the laminate is thermally fused and joined to the bag portion at the four corners of the film portion,
A packaging material characterized in that the bag portion and the film portion communicate with the atmosphere. A method for producing the packaging material according to claim 1,
Forming a hole in the edge of one laminate of two laminates comprising a bag portion and having at least a base layer and a heat seal layer;
These two laminates are overlaid so that the heat seal layers are in contact with each other, and the laminate having at least the base layer and the heat seal layer constituting the film portion is formed in the heat seal layer. Layered so that it touches the surface of the laminated body,
A method for producing a packaging material, comprising heat-sealing edges of a laminated body constituting a bag part and a film part that are overlapped.

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