JPH02103361A - Cold insulating sheet - Google Patents

Abstract

PURPOSE:To provide a cold insulation sheet which holds an excellent cold insulating state by means of cold air of a water absorptive polymer accumulated during transport of foods by a method wherein a plurality of bag spaces are formed between a surface sheet material and a rear sheet material at intervals of a given time, and each bag space is filled with the water absorptive polymer. CONSTITUTION:A cold insulating sheet 4 is formed with a rear sheet material 5 on the rear side and a surface sheet material 6 on the surface side. The surface and rear sheet materials 6 and 5 are firmly sealed through an adhesion film 7, disposed at an intermediate part, by applying heat seal on a seal part C. A plurality of bag spaces K are formed in one row in the cod insulating sheet 4, and each space K is filled with a water absorptive polymer 9 and ceramic particles 10 capable of emitting far infrared rays. A substance, having water permeability, formed by laminating ester and polyethylene in a manner to form them in a netlike shape, is used as the rear sheet material 5, and the surface material 6 is formed by thermoplastic resin, e.g. nylon, and a substance having nonpermeability is used as the surface material sheet. The water absorptive polymer 9 is previously impregnated with water through the rear sheet material 5, and by performing cold insulation in a refrigerator, cold is accumulated in water and a food is placed thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a cold insulation sheet that is capable of keeping meat, etc., cool when transporting the meat.

(Prior art and its problems) Conventionally, cold insulation sheets filled with cold storage agents, etc. have been used for cold transportation, but conventional cold insulation sheets are weak in strength, and the liquid cold storage agents inside leak out. However, there are problems such as having an adverse effect on food, etc., and there are also problems in terms of design, such as creating a sense of incongruity with the food, etc. being transported.

(Means for Solving the Problems) The present invention has been devised in view of the above-mentioned conventional problems, and aims to provide a cold insulation sheet with high seal strength and excellent design. , the gist of which is a cold insulating sheet that is placed inside a case for transporting meat, etc., and the cold insulating sheet consists of a backing sheet material on the back side made of a nonwoven fabric or the like having ventilation, water permeability, and non-woven fabric. The front sheet material made of breathable nylon or the like and the back side of the front sheet material break, become fluidized by applying heat, and soak into the back sheet material. An adhesive film capable of sealing the sheet material is provided, and is heat-sealed at predetermined intervals to form a plurality of bag spaces between the front sheet material and the back sheet material, and at least It is encapsulated with a water-absorbing polymer.

(Function) An adhesive film is disposed between the back sheet material and the front sheet material that make up the cold insulation sheet, and when heat sealing is performed at predetermined intervals to form bag spaces, the adhesive film is removed by heat sealing. It is activated to flow and soaks into the back sheet material, strongly integrating the back sheet material and front sheet material, resulting in extremely strong sealing performance. Furthermore, since a water-absorbing polymer is sealed in the bag space, water should be soaked into the bag space from the backing sheet material in advance so that the water-absorbing polymer is soaked with water, and then kept cool in a freezer or the like. As a result, the water contained in the water-absorbing polymer will be stored cold, and by taking it out in this state and placing it in a case etc., and placing food etc. on top of it, the water-absorbing polymer will be protected from cold air during transportation. This allows transportation to be carried out in good cold storage conditions.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is an enlarged diagram of the main parts of the cold insulation sheet of this example, and the second
The figure is a diagram showing how the cold insulation sheet of FIG. 1 is used.

In the figure, the cold insulation sheet 4 is a sheet in which a plurality of bag spaces K are formed in a line direction, and each bag space contains a water-absorbing polymer 9, 9, 9 and ceramic particles 10, 10 capable of emitting far infrared rays. .10 is enclosed.

The back side of the cold insulation sheet 4 is a back sheet material 5, and the front side is a top sheet material 6. The front sheet material 6 and the back sheet material 5 are heat-sealed at the sealing portion C, so that they are firmly sealed with an adhesive film 7 disposed in the middle.

To explain each material here, as the water-absorbing polymer 9, for example, saponified crosslinked vinyl ester-unsaturated carboxylic acid copolymers described in JP-A-52-14689 and JP-A-52-27455; Crosslinked polyacrylates and acrylic acid-acrylic ester copolymers, crosslinked isobutylene-maleic anhydride copolymers, crosslinked polyethylene oxide, and the like are used. Further, polymers having self-crosslinking properties, such as self-crosslinking polyacrylic acid, the resin described in Japanese Patent Publication No. 54-30710, and polymers containing at least a hydroxyl group and a carboxylade group in the molecule, such as Japanese Patent Publication No. 54-30710, The resin described in No. 37994 may also be used.

The above-mentioned water-absorbing polymer may be used alone or in combination of two or more types, and the water-absorbing performance is 20 to 20.
The shape of the water-absorbing polymer 9 is preferably about 0.00 g/g, and there is no particular limitation on the shape of the water-absorbing polymer 9, and it may be in any shape such as a powdery 2-particle shape, a flake-like shape 9, or a 4a-fiber shape.

The backing sheet material 5 can be made of, for example, a laminated layer of reticulated ester and polyethylene, and has water permeability, so that it can effectively absorb moisture and drips from food, etc. It can be introduced into the bag space.

The top sheet material 6 is made of a thermoplastic resin such as nylon, and may be formed of a single film or a laminated composite film. Further, in some cases, the top sheet material 6 may be configured to include an ultraviolet absorber or the like.

In short, it only needs to be impermeable, and other materials such as cold-resistant fluorinated/halogenated carbon, ionomer, polyamide saran coat, plyofilm, polybutylene, polycarbonate, polyester saran coat, etc., may also be used, as well as soft PVC film, polyvinyl alcohol, Polyurethane or the like can also be used.

Further, although low density polyethylene is used for the adhesive film 7, a copolymer of low density polyethylene and ethylene vinyl acetate may be used instead. Furthermore, this adhesive film 7 can also be made of an ionomer resin, and when it is made of an ionomer resin, the ionic crosslinks between long chain molecules are weakened when the ionomer resin is heated and it exhibits thermal fluidity. If the back sheet material 5 side made of the nonwoven fabric is impregnated with metal powder such as aluminum,
The ionomer resin that has flowed down due to the heat forms the backing sheet material 5.
It penetrates into the interior and replaces the metal ions inside, and after cooling, the molecular network structure is fixed by ionic bonds, making it possible to obtain an extremely strong seal portion C. Also, since the ionomer resin can be sealed at low temperatures, heat sealing can be completed at low temperatures.

In this example, the top sheet material 6 and the adhesive film 7 are
Temperature-indicating paints 8, 8.8 are hermetically sealed in appropriate places between them, and the temperature-indicating paints 8 are printed, etc. between the top sheet material 6 and the adhesive film 7 using a method such as dry lamination or extrusion lamination. A metallic oil-based ink can be used as the temperature-indicating paint 8, and since it is sealed, leakage to the outside is completely prevented. These temperature-indicating paints 8, 8.8 cause color changes in the bag space depending on temperature changes inside the bag, and allow the freezing and melting temperatures of the water-absorbing polymer 9 inside the bag space to be easily visible from the outside. It is something. Incidentally, advertising characters or figures can be drawn on the front sheet material 6 using the temperature-indicating paints 8, 8.8, and as the figures change color due to changes in temperature, the advertising effect of the cold insulation sheet 4 can be further enhanced. can be improved.

Note that if perforations or the like are provided in the seal portion C, each bag space K of the cold insulation sheet 4 can be separated individually. Incidentally, when impregnating water into the water-absorbing polymer 9, if a deodorant is impregnated into the water-absorbing polymer 9 at the same time,
It can also effectively remove putrid odors such as trimethylamine and mercaptan.

The cold insulation sheet 4 configured in this way is laid on the bottom of the case body 1 as shown in FIG. 2, and meat such as fish F can be placed above it. The sealing sheet 3 can be sealed and kept cool in a sealed state for transportation of foods and the like.

(Effects of the Invention) The cold insulating sheet of the present invention is a cold insulating sheet disposed in a case for transporting meat, etc., and the cold insulating sheet has a back side made of a nonwoven fabric or the like having ventilation and water permeability. A back sheet material, a top sheet material on the front side made of impermeable nylon, etc., and a material that is attached to the back side of the front sheet material, becomes fluidized by applying heat, and soaks into the back sheet material. The adhesive film is provided with an adhesive film capable of sealing the front sheet material and the back sheet material, and is heat-sealed at predetermined intervals to form a plurality of bag spaces between the front sheet material and the back sheet material. Since at least a water-absorbing polymer is sealed in the bag space, the back sheet material and top sheet material are tightly sealed by the adhesive film, resulting in extremely strong sealing strength, and the bag is sealed in the internal bag space. It is possible to effectively prevent water-absorbing polymers from leaking out, and the water-absorbing polymers can be impregnated with water or the like to keep them cool, exhibiting their cold storage ability, and can be easily used for transporting foods and the like.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an enlarged configuration diagram of the main parts of the cold insulation sheet of this example, and FIG. 2 is a diagram showing the usage state of the cold insulation sheet.

Claims (1)

[Claims] A cold insulating sheet placed inside a case for transporting meat, etc., the cold insulating sheet consists of a backing sheet material on the back side made of a nonwoven fabric etc. that has ventilation and water permeability, and an impermeable nylon etc. A top sheet material on the front side consisting of;
An adhesive film that is attached to the back side of the front sheet material, becomes fluidized by applying heat, and can penetrate into the back sheet material to seal the front sheet material and the back sheet material,
A plurality of bag spaces are formed between the front sheet material and the back sheet material by heat sealing at predetermined intervals, and
A cold storage sheet characterized in that at least a water-absorbing polymer is sealed in each bag space.