JP2019172364A - Packaging material for cold insulation and method for producing the same - Google Patents

Abstract

To provide a bag-shaped packaging material for cold insulation excellent in a heat insulating effect, and to provide a method for producing the same.SOLUTION: A bag-shaped packaging material for cold insulation composed of an outer surface layer 2 and an inner surface layer 3 each laminated thereon with heat insulating sheets having aluminum deposition layers 2a, 3a on one surface and foamed resin layers 2b, 3b on the other surface, wherein the bag-shaped packaging material has a storage space in an inside and is provided with an opening part for shipping and receiving articles to be stored; the aluminum deposition layer 2a of the outer surface layer 2 is arranged at an outer surface side of the packaging material for cold insulation, and the aluminum deposition layer 3a of the inner surface layer 3 is arranged at a storage space side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a novel cold insulation packaging material and a method for producing the same.

  When purchasing refrigerated or frozen foods sold at stores such as department stores and supermarkets, for example, keep them cold so that the quality of the foods does not deteriorate before taking them home. It is necessary to keep the state.

  In this case, it is an excessive burden on the purchaser that the purchaser himself / herself brings the packaging material for cold storage to the store. In particular, for example, in a cold storage box made of polystyrene foam, it becomes bulky and increases the burden in terms of transportation. For this reason, a store that sells food or the like that needs to be kept cold is required to provide a simple cooling packaging material, preferably free of charge or at least inexpensively.

  As such a cold insulation packaging material, for example, it is conceivable to use a bag made of an aluminum cold insulation quilting sheet (see, for example, Patent Document 1). In fact, the burden is too great, and even if a product such as a food product is packaged together with a cooling agent, a sufficient cooling effect cannot be obtained.

  In addition, not only for such business use, but also for rice balls and lunch boxes prepared in each home, especially when taking them outdoors, especially in summer, it is necessary to keep them cold. Therefore, it is desired to develop an inexpensive packaging material that can be easily disposed of on the go if possible, and at the same time has a sufficient cooling effect and can be disposed of easily.

  Therefore, the present inventor first, for the purpose of solving the problems of the prior art as described above, is a cold insulation packaging material having a double-structured package body composed of an outer surface layer and an inner surface layer, The outer surface layer and the inner surface layer are formed of a cold insulating sheet, and a heat insulating packaging material is proposed in which a heat insulating material is disposed between the outer surface layer and the inner surface layer of the packaging material body (patent) Reference 2). Furthermore, the present inventor has also proposed a simple and economically advantageous production method for such a cold insulation packaging material (see Patent Document 3).

  By the way, conventionally, in the field of heat insulating sheets and heat insulating bags, various attempts have been made to use foam sheets and foams made of synthetic resins as their main materials. Moreover, the structure which combines such a foam sheet or foam and the reflective film which has an aluminum foil-like body is also examined.

  For example, Patent Document 4 includes a bag body formed in a box shape made of a flexible heat insulating material having a metal layer for heat reflection on both sides, and a lid that can be opened and closed continuously connected from the side wall. A cold insulation packaging bag is disclosed in which the front side wall of the bag body is configured such that the left and right side edges thereof are separably joined to the left and right side edges by a fastener and can be opened forward. In Patent Document 5, an upper film made of a soft synthetic resin, a reflective film having an aluminum foil, a foamed sheet made of a soft synthetic resin, and a lower film made of a soft synthetic resin are sequentially laminated. The heat insulation sheet characterized by this is disclosed. Patent Document 6 discloses a heat insulation characterized in that a reflective film having an aluminum foil on each side of a foamed sheet made of a soft synthetic resin and an outer layer film made of a soft synthetic resin are sequentially laminated. A sheet is disclosed.

JP 2011-036463 A Japanese Patent Application No. 2017-195078 Japanese Patent Application No. 2018-40170 Japanese Utility Model Publication No. 58-65276 Japanese Utility Model Publication No.59-164728 Japanese Utility Model Publication No. 59-176520

  However, the cold insulation packaging bag disclosed in Patent Document 4 includes a relatively large box-shaped bag body and an openable / closable lid, and the front side wall of the bag body is separable by a fastener. (See FIG. 1 of Patent Document 4). Moreover, the specific embodiment of the heat insulation sheet disclosed by the said patent document 5 and the patent document 6 was the use as an interior material in the box-shaped body which has a case main body and a case upper cover (FIG. 3 of patent document 5). To 4, see FIGS. 4 to 5 of Patent Document 6). Thus, a simple and industrial production method for a bag-shaped cold insulation packaging material formed from a heat insulating sheet having an aluminum vapor deposition layer on both sides of a foamed resin layer and formed integrally has not been established, Such a cold insulation packaging material has not been put to practical use.

  As a result of intensive studies to solve the above problems, the present inventor has an aluminum vapor deposition layer on one surface and a foamed resin layer on the other surface as an outer surface layer and an inner surface layer of the cold insulation packaging material. Using heat insulating sheets of specific dimensions and shapes, positioning them at predetermined locations, laminating them, and then heat-sealing them in a specific procedure, it is possible to efficiently produce a cold insulation packaging material having the desired bag shape, It has been found that it can be produced economically, and the present invention has been completed.

  That is, according to the first aspect of the cold insulation packaging material of the present invention, both are substantially rectangular, each composed of a heat insulating sheet having an aluminum vapor deposition layer on one side and a foamed resin layer on the other side. A bag-like cold insulation packaging material having a storage space inside and an opening for taking in and out the storage object in the storage space by heat-sealing the laminated body of the outer surface layer and the inner surface layer The aluminum vapor deposition layer of the outer surface layer is disposed on the outer surface side of the cold insulation packaging material, and the aluminum vapor deposition layer of the inner surface layer is disposed on the storage space side. Material is provided.

  Moreover, according to the 2nd aspect of the cold insulation packaging material of this invention, the cold insulation packaging material which has the gusset which folded the said laminated body inside in the bottom part facing the said opening part is provided. A cold insulation packaging material having a gusset is preferably employed because the internal storage space becomes large.

  According to the first aspect of the method for producing a cold insulation packaging material of the present invention, both are substantially rectangular, each having an aluminum vapor deposition layer on one surface and a foamed resin layer on the other surface, respectively. The laminated structure of the outer surface layer and the inner surface layer is heat-sealed, has a storage space inside, and has a bag-like cold insulation packaging provided with an opening for taking in and out the stored items in the storage space. A method of manufacturing a material, wherein the longitudinal dimension is substantially the same as the inner surface layer, and the short dimension is larger than the foam resin of the heat insulating sheet of the outer surface layer larger than the inner surface layer. A first step in which the foamed resin layers of the sheet are opposed to each other and positioned and laminated so that the center lines extending in the longitudinal direction and the lateral direction coincide with each other; a pair of all the peripheral edge portions of the inner surface layer and the outer surface layer With the foamed resin layer A second step of forming a laminated body by heat sealing, along the center line extending in the short direction of the laminated body formed in the second step, folded in half so that the inner surface layer is inside, A pouch-shaped cold packaging, comprising: a third step of overlapping both side portions in the longitudinal direction of the laminate; and a fourth step of heat-sealing both side portions overlapped in the third step. A method of manufacturing the material is provided.

  According to the second aspect of the manufacturing method of the cold insulation packaging material of the present invention, in the third step, the inner layer is folded in two along the center line extending in the short direction of the laminate. In the middle of superimposing both sides in the longitudinal direction of the laminate, or after superimposing both sides, a length corresponding to the width direction length of the gusset of the cold insulation packaging material is A method for manufacturing a cold insulation packaging material is provided in which the gusset is formed by further folding two sides in a direction opposite to the half fold along the line and overlapping both sides. This manufacturing method is preferably employed because a gusset can be easily formed and the storage space inside the intended cold insulation packaging material becomes large.

  The cold insulation packaging material of the present invention can maintain a necessary and sufficient cold insulation state, for example, until a food item that needs to be kept cold is purchased in a store such as a department store or a supermarket and is taken home to the purchaser. There is an effect. Moreover, the manufacturing method of the cold insulation packaging material of this invention is a cold insulation packaging which has a bag-like shape by a simple heat-sealing method without adopting a labor-intensive process represented by a sewing machine method. The material can be produced economically advantageously.

It is a fragmentary sectional view which shows typically the laminated body of the outer surface layer and inner surface layer which are respectively comprised with the heat insulation sheet which has an aluminum vapor deposition layer in one surface, and has a foamed resin layer in the other surface. It is a perspective view which shows typically the state in the middle of laminating | stacking an outer surface layer and an inner surface layer. It is a top view which shows typically the relationship of the longitudinal direction dimension of the outer surface layer of a laminated body of a 1st process, and an inner surface layer, and a transversal direction dimension. The shaded portion in the figure indicates a portion where the outer surface layer and the inner surface layer do not overlap. It is a top view which shows typically the heat seal site | part of the laminated body of a 2nd process. The hatched portion in the figure indicates the part to be heat sealed. It is a top view which shows typically the site | part which folds a laminated body in a 3rd process. Along the one-dot chain line portion in the figure, the laminate is folded in half so that the inner surface layer is inside, and both side portions in the longitudinal direction of the laminate are overlapped. It is a perspective view which shows typically the state in the middle of folding in half so that the inner surface layer of a laminated body may become inside in a 3rd process. It is a perspective view which shows typically the method of forming the gusset of the packaging material for cold preservation in a 3rd process. It is a top view which shows typically the heat sealing site | part of a 4th process, and the cold insulation packaging material which has a bag-like shape. The hatched portion in the figure is a heat seal portion.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to this embodiment.

(Cold insulation packaging material)
FIG. 1 schematically shows a laminate 1 composed of an outer surface layer 2 and an inner surface layer 3 made of a heat insulating sheet having aluminum vapor deposition layers 2a and 3a on one surface and foamed resin layers 2b and 3b on the other surface. FIG.

  There is no particular limitation on the type and manufacturing method of the heat insulating sheet having the aluminum vapor-deposited layers 2a and 3a on one side and the foamed resin layers 2b and 3b on the other side. can do.

  The aluminum vapor-deposited layers 2a and 3a are obtained by evaporating aluminum in a vacuum state and attaching the vapor to a surface of a base material layer made of a thermoplastic resin film (not shown) to form a thin film. The thermoplastic resin for the base layer is not particularly limited as long as it is a resin that can be used for packaging materials. For example, polyolefins such as homopolymers or copolymers such as ethylene, propylene, and butene, and cyclic polyolefins. Amorphous polyolefin such as polyester, polyester such as polyethylene terephthalate, polyethylene-2,6-naphthalate, polyamide such as nylon 6, nylon 66, nylon 12, copolymer nylon, polyvinyl alcohol, ethylene-vinyl alcohol polymer, polyimide, poly Examples include ether imide, polysulfone, polyether sulfone, polyether ether ketone, polycarbonate, polyvinyl butyral, polyarylate, fluororesin, and acrylate resin. Among these, polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) are preferably used.

  A primer layer (not shown) can be provided between the aluminum vapor-deposited layers 2a and 3a and the base material layer. A surface coat layer (not shown) can be provided on the aluminum vapor deposition layer.

  The foamed resin layers 2b and 3b on the other surface of the heat insulating sheet are obtained by finely dispersing a gas in a synthetic resin and molded into a foam (foam) or a porous shape, and the types and production methods are particularly limited. Not. Examples of the raw material synthetic resin include polyurethane, polystyrene, low density polyethylene, high density polyethylene, linear polyethylene (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-propylene copolymer, polyethylene terephthalate, polypropylene, etc. Is mentioned. Although the thickness of a foamed resin layer is not specifically limited, Usually, it is 1-3 mm.

  As the heat insulating sheet having the aluminum vapor-deposited layers 2a and 3a on one surface and the foamed resin layers 2b and 3b on the other surface, for example, a sheet obtained by laminating a polyethylene foam sheet on an aluminum vapor-deposited PET film is preferably used.

  Since both the outer surface layer 2 and the inner surface layer 3 have the foamed resin layers 2b and 3b, they have a high heat insulating effect. In addition, since the foamed resin layers 2b and 3b are formed of a thermoplastic resin, it is easy to heat predetermined portions such as the peripheral ends of the outer surface layer 2 and the inner surface layer 3 to a temperature equal to or higher than the melting temperature of the thermoplastic resin. Can be heat sealed. Thereby, while having a storage space inside, the bag-shaped cold insulation packaging material provided with the opening part for taking in / out a stored object in the said storage space can be formed.

  That is, the packaging material for cold insulation of the present invention is both substantially rectangular, and has an outer surface layer and an inner surface layer each composed of a heat insulating sheet having an aluminum vapor deposition layer on one surface and a foamed resin layer on the other surface. A bag-shaped cold insulation packaging material having a storage space inside and an opening for taking in and out the storage object in the storage space, wherein the outer surface layer is heat sealed. The aluminum vapor deposition layer is arranged on the outer surface side of the cold insulation packaging material, and the aluminum vapor deposition layer of the inner surface layer is arranged on the storage space side. Moreover, in the cold insulation packaging material of this invention, it is preferable to have the gusset which folded the said laminated body inside in the bottom part facing the said opening part.

  Hereinafter, the manufacturing method of the cold insulation packaging material of this invention is divided into 1st-4th processes, and is demonstrated in this order.

(First step)
FIG. 2 is a perspective view schematically showing a state in the middle of laminating the outer surface layer 2 and the inner surface layer 3 that are both substantially rectangular. The foamed resin layer 2b of the outer surface layer 2 and the foamed resin layer 3b of the inner surface layer are laminated so as to face each other. Moreover, after the outer surface layer 2 and the inner surface layer 3 are laminated, the aluminum vapor deposition layers 2a and 2b are located on both surface sides of the laminate.

  FIG. 3 is a plan view schematically showing the relationship between the longitudinal dimension and the lateral dimension of the outer surface layer 2 and the inner surface layer 3. The outer surface layer 2 and the inner surface layer 3 have substantially the same length in the longitudinal direction, and the lateral direction size of the outer surface layer 2 is larger than that of the inner surface layer 3. The hatched portions are not overlapped with the foamed resin layer, and are exposed so that the end portions on both sides extending along the longitudinal direction of the outer surface layer 2 have substantially the same width. The width of the hatched portion is not particularly limited, but is usually in the range of 3 mm to 15 mm. This hatched portion corresponds to a heat seal portion in the fourth step described later.

  As shown in FIGS. 2 and 3, in the first step, both the outer layer heat insulating sheet and the inner surface layer heat insulating sheet that are both substantially rectangular, have substantially the same longitudinal dimension, and have different lateral dimensions. Prepare. Then, the foamed resin layer of the heat insulating sheet for the inner surface layer having a small short-side dimension is opposed to the foamed resin layer of the heat insulating sheet for the outer surface layer having a large short-side dimension, and extends in the longitudinal direction and the short-side direction, respectively. Laminate by positioning so that the center lines coincide. In the first step, the heat sealing process between the outer surface layer and the inner surface layer has not been performed yet.

(Second step)
FIG. 4 is a plan view schematically showing a heat seal portion of the laminate 1 formed in the second step. The shaded portion in the figure is a heat seal portion. In the second step, the laminated body 1 is formed by heat-sealing all the peripheral end portions of the inner surface layer 3 and the contacting portions of the outer surface layer 2 through the foamed resin layers of both layers. The heat sealing method is not particularly limited, and a known method that is usually performed industrially can be employed. There are no particular limitations on the type and size of the heat sealing machine and the heat sealing conditions.

(Third step)
As shown in FIG. 5, in the third step, the inner surface layer 3 of the laminate 1 is located along the center line 6 extending in the short direction of the laminate 1 formed by heat sealing in the second step. The two side portions in the longitudinal direction of the laminate 1 are overlapped.

  FIG. 6 schematically shows a state in which the laminate 1 is folded in half so that the outer surface layer 2 is on the outer side and the inner surface layer 3 is on the inner side. By folding in half, the aluminum vapor deposition layer of the outer surface layer 2 is arranged on the outer surface side of the cold insulation packaging material, and the aluminum vapor deposition layer of the inner surface layer 3 is arranged on the storage space side of the cold insulation packaging material.

  As shown in FIG. 7, in the third step, the inner layer 3 is folded in two along the center line extending in the short direction of the laminate 1 so that the inner surface layer 3 is on the inner side. The length corresponding to the length in the width direction of the gusset 7 of the intended cold insulation packaging material is overlapped along the center line during the overlapping of both side portions or after overlapping the both side portions, The two sides can be overlapped with each other in the opposite direction to the half-fold. By adopting this method, not only the envelope-shaped cold insulation packaging material but also the cold insulation packaging material having the gusset 7 can be easily manufactured.

(4th process)
FIG. 8 is a plan view schematically showing the heat sealing portion 5 in the fourth step and the cold insulation packaging material 8 having a bag shape. The hatched portion in the figure is a heat seal portion. That is, the cold insulation packaging material 8 having a desired bag shape is formed by heat-sealing the foamed resin layers on both sides of the outer surface layer 2 superimposed in the third step. Similar to the second step, the heat sealing method and conditions in the fourth step are not particularly limited.

  As shown in FIG. 8, the outer packaging layer 8 is formed on the outer side of the cold insulation packaging material 8 formed in a bag shape, the inner layer 3 is not shown on the inner side, and the aluminum vapor deposition layer of the outer surface layer 2 is located on the outermost layer. is doing.

  The upper side of FIG. 8 is an opening 8a of the cold insulation packaging material 8, and food or the like requiring cold insulation can be stored into the cold insulation packaging material 8 from the opening 8a. The lower side is the bottom 8b of the cold insulation packaging material 8. The bottom 8b can be reinforced by a known method as necessary. Further, as described above, it is also possible to provide a gusset on the bottom 8b by adopting a method (see FIG. 7) for forming a gusset in the third step. The presence or absence of a gusset on the bottom 8b can be selected as appropriate.

  The size of the cold insulation packaging material 8 formed in a bag shape is not particularly limited. If necessary, the size can be changed in stages, such as S size, M size, and L size. Moreover, a character, a pattern, etc. can also be printed on the outer surface of the cold insulation packaging material 8.

  The cold insulation packaging material of the present invention is useful, for example, for applications where a purchaser takes home the food that needs to be kept cold and sold in a store such as a supermarket.

DESCRIPTION OF SYMBOLS 1 Laminated body 2 Outer surface layer 2a Aluminum vapor deposition layer of outer surface layer 2b Foamed resin layer of outer surface layer 3 Inner surface layer 3a Aluminum vapor deposition layer of inner surface layer 3b Foamed resin layer of inner surface layer 4 Portion where outer surface layer and inner surface layer do not overlap 5 Heat Seal part 6 Folded part of laminated body 7 Gusset of cold insulation packaging material 8 Cold insulation packaging material having bag-like shape 8a Opening of cold insulation packaging material 8b Bottom of cold insulation packaging material

Claims (4)

  Both are substantially rectangular and have a heat-sealed laminate of an outer surface layer and an inner surface layer each composed of a heat insulating sheet having an aluminum vapor deposition layer on one surface and a foamed resin layer on the other surface. A bag-shaped cold insulation packaging material having a storage space and provided with an opening for taking in and out an article in the storage space, wherein the aluminum vapor deposition layer of the outer surface layer is made of the cold insulation packaging material. A cold insulation packaging material, which is disposed on the outer surface side, and the aluminum vapor deposition layer of the inner surface layer is disposed on the storage space side.   The packaging material for cold insulation of Claim 1 which has the gusset which folded the said laminated body inside in the bottom part facing the said opening part. Both are substantially rectangular and have a heat-sealed laminate of an outer surface layer and an inner surface layer each composed of a heat insulating sheet having an aluminum vapor deposition layer on one surface and a foamed resin layer on the other surface. A manufacturing method of a bag-shaped cold insulation packaging material having a storage space and provided with an opening for taking in and out the stored items in the storage space,
The foamed resin layer of the heat insulating sheet of the inner surface layer is opposed to the foamed resin of the heat insulating sheet of the outer surface layer whose longitudinal dimension is substantially the same as that of the inner surface layer and whose lateral dimension is larger than the inner surface layer. A first step of positioning and stacking so that center lines extending in the longitudinal direction and the lateral direction coincide with each other,
A second step of forming a laminate by heat-sealing all the peripheral end portions of the inner surface layer and the contacting portion of the outer surface layer through the foamed resin layer;
Folding the inner layer in half along the center line extending in the short direction of the laminate formed in the second step so that the inner surface layer is on the inner side, and overlapping both sides in the longitudinal direction of the laminate 3 steps and
The manufacturing method of the bag-shaped cold insulation packaging material characterized by having the 4th process of heat-sealing the both-sides side part piled up by the said 3rd process.   In the third step, along the center line extending in the short direction of the laminate, the inner layer is folded in half so as to be inward, and the both sides in the longitudinal direction of the laminate are overlapped, Alternatively, after overlapping the side portions on both sides, the length corresponding to the width direction length of the gusset of the cold insulation packaging material is further folded in two along the center line in the opposite direction to the two folds. The method for manufacturing a cold insulation packaging material according to claim 3, wherein side portions are overlapped to form the gusset.

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