JP3304117B2 - Manufacturing method of vacuum insulation pack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a vacuum heat insulating material pack which can be used as a heat insulating material for refrigerators and the like.

[0002]

2. Description of the Related Art A conventional vacuum heat insulating material pack has 10 internal parts.
Although inorganic foamed powder such as pearlite with a vacuum of -2 Torr or less was coated with a plastic-metal foil laminating film container, metal was used to maintain the vacuum for a long period of time and maintain heat insulation performance. On the other hand, if the thickness of the foil is sufficiently increased, the surface heat conduction increases by increasing the thickness of the metal foil, so that the thermal conductivity of the vacuum heat insulating material pack in the initial state increases, and the heat insulating performance deteriorates.

[0003] For example, in the case of coating with an aluminum foil having a thickness of 30 µm and in the case of not covering it, an initial value of 0.0
080Kcal / mh ° C and 0.0060Kcal / mh
There was a significant difference in ° C. Therefore, a container having an excellent initial value and a small change over time has been required.

As a means for solving such a problem, there is one disclosed in Japanese Utility Model Laid-Open No. 58-111498.

The contents described in Japanese Utility Model Laid-Open Publication No. Sho 58-111498 will be described with reference to FIGS.

[0006] FIG odor Te, 31 Pa vacuum heat insulating material packed - inorganic foam powder 32 and the like lights, plastic - consists Tofirumu 33 made of container 34 - laminating a metal foil. The structure of the film 33 is as follows.
a plastic film such as polypropylene with a thickness of μ, a metal foil made of aluminum foil with a thickness of 30 μ on the middle layer 36, and a plastic film such as polyethylene with a thickness of 50 μ on the inner layer 37. The inorganic foamed powder 32 is filled between two laminate films 33 to seal the outer periphery.

Here, the middle layer 36 covers the surface of the seal portion 38 up to a distance of 5 mm from the inner end 39 of the adhesive.

By using the laminate film having such a structure, since there is no metal foil in the seal portion, a vacuum heat insulating material pack having low heat conductivity and excellent initial characteristics can be obtained. Since the non-existing portion is minute relative to the entire surface area, it is characterized in that a vacuum heat insulating material pack with little change over time can be obtained, which is the same as when completely covered with metal foil.

[0009]

However, in manufacturing the above-mentioned conventional laminate film, if the size of the container is 50 × 50 × 4 tcm, the outer plastic film is cut into a size of 53 × 53 cm. Cut the middle layer metal foil to a size of 51.5 x 51.5 cm,
Furthermore, the plastic film of the inner layer must be cut into a size of 53 × 53 cm, and each must be attached.

[0010] In such a method, since it is cut into a predetermined size in advance, continuous production is difficult, and there is a problem that it cannot be manufactured at a low cost industrially.

Further, if the mounting position of the metal foil of the middle layer is displaced, the upper and lower metal foils come into contact with each other in the heat seal portion, and there is a problem that the heat insulating performance is reduced and stable performance cannot be obtained. Was.

Further, in the conventional vacuum heat insulating material pack, since the peripheral heat seal portion is separated from the wall surface when attached to the wall surface of the heat insulating box, the heat insulating material is filled when the foam heat insulating material is filled.
A cavity is formed in the space between the seal portion and the wall surface, resulting in a poor appearance due to shrinkage, resulting in a problem that product quality is significantly impaired.

The present invention solves the above-mentioned conventional problems. It is possible to produce a vacuum heat insulating material pack having stable performance, to be industrially inexpensive, and to obtain a product having excellent product quality. It is an object to provide a heat-insulated box body.

[0014]

In order to solve the above-mentioned conventional problems, a method of manufacturing a vacuum heat insulating material pack according to the present invention is directed to a method of manufacturing a plastic-laminated film in a part of a vacuum-formed container. Attach a core material having an open-cell structure to the inside of the container, and then heat seal the peripheral part with a lid material made of a plastic laminate film. Is a production method in which the pressure is reduced.

[0015]

[Action] Accordingly to the above-described structure, a barrier material in a container after vacuum forming - tosyl - for mounting by Le, it can be attached to prepared industrially at low cost becomes is easy can be continuously produced.

Further, since the container is made by vacuum forming, when the vacuum heat insulating pack is mounted on the wall surface of the heat insulating box, it is possible to form the heat seal portion on the peripheral edge into close contact with the wall surface. Therefore, it is possible to obtain a heat-insulating box with stable product quality, which does not cause shrinkage due to the formation of a cavity when the foamed heat-insulating material is filled.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3 and 4. FIG. In FIG. 1, reference numeral 1 denotes a vacuum heat-insulating material pack, a container 4 formed by vacuum-forming a core material 2 such as open-celled rigid urethane foam and a plastic laminate film 3, and a plastic-metal foil laminate film 5.
And a cover member 8 made of a plastic laminate film 7.

The structure of the films 3 and 7 is as follows.
30 μm thick plastic film such as denatured acrylonitrile etc. having excellent chemical resistance and gas barrier resistance, middle layer 10 having 20 μm thick plastic film such as polyvinylidene chloride having excellent gas barrier resistance, and inner layer 11 having 30 μm thick. Chemical resistance such as modified acrylic nitrile,
It is made of a plastic film having excellent gas barrier properties, and is bonded to each other to form a laminate film.

The structure of the film 5 is as follows.
A plastic film such as a modified acrylic nitrile having a thickness of 30 μm and excellent in chemical resistance and gas barrier resistance; a metal layer made of an aluminum foil having a thickness of 9 μm in the middle layer 13;
4 is made of a plastic film such as a modified acrylic nitrile having a thickness of 30 μm and having excellent chemical resistance and gas barrier resistance, and is bonded to each other to form a laminate film.

Then, the barrier member 6 is attached to the inner surface of the container 4 by a method such as a heat seal, and then the core member 2 made of a hard urethane foam having an open cell structure is filled therein. After the pressure is reduced, the cover material 8 is heat-sealed.
Sealed.

With the above structure, the barrier material 6 having the metal foil is partially adhered, so that the heat conduction by the metal foil is small and excellent heat insulating performance is obtained. Since only the metal foils are provided, the upper and lower metal foils do not come into contact with each other due to the displacement of the bonding position of the barrier material 6, and stable performance is obtained.

A method of manufacturing the vacuum heat insulating material pack will be described with reference to FIG. The molding material 17 is obtained by forming the laminate film 15 into a concave shape by the vacuum forming machine 16.

Thereafter, a barrier material 19 having a desired size is attached to the inner surface of the flat portion 18 of the molding material 17 by a heat sealer 20, and a core material 21 of continuous hard urethane foam is filled, and a cover material 22 is used. Two opposite sides are heat-sealed, placed in a vacuum chamber 23, and the inside is depressurized. Then, the other two opposite sides are heat-sealed and sealed to obtain a vacuum heat insulating material pack 24.

According to such a method, since the barrier material 21 having a metal foil is attached to the molding material 17 by a heat seal, the attachment is easy, continuous production is possible, and industrially inexpensive production is possible. It becomes possible.

In FIG. 4, reference numeral 25 denotes an insulated box ,
6, the outer box 27, before the vacuum heat insulating material pack 28 mounted without any gap to the inner surface of Kigaibako 27, foam insulation filling the space 29 formed by the front Symbol inner box 26 and outer box 27 It is made of material 30.

With the above configuration, the vacuum heat insulating material pack 28 is attached to the inner surface of the outer box 27 without any gap, so that the space 29 formed by the inner box 26 and the outer box 27 is formed.
When the foamed heat insulating material 30 is filled, no void is formed, and a stable heat insulating box without shrinkage can be obtained.

When the vacuum heat-insulating material pack 28 is attached to the outer surface of the inner box 26, the material of the lid member 22 is the same as that of the barrier material 19, and the outer layer 9 is made of a chemical resistance such as a modified acrylic nitrile having a thickness of 30 μm. Lamine consisting of a plastic film with excellent gas barrier resistance, a metal foil of 9 μm thick aluminum foil for the middle layer 10, and a plastic film with excellent chemical resistance and gas barrier resistance such as modified acrylic nitrile of 30 μm thickness for the inner layer 11 for the inner layer 11. Better performance can be obtained by using a film.

[0028]

As described above, according to the present invention, since the barrier material is attached to the container after vacuum forming by a heat seal, the attachment is easy, continuous production is possible, and industrially inexpensive production is possible. it can.

[Brief description of the drawings]

[1] of the vacuum heat insulating material packed in one embodiment of the present invention
Sectional view of vacuum insulation pack made by manufacturing method

FIG. 2 is an enlarged sectional view of a main part of FIG. 1;

FIG. 3 a is a cross-sectional view of a sheet-like laminated film before vacuum forming. B is a cross-sectional view showing forming into a container by a vacuum forming machine. C. A barrier material is attached to the inner surface of the container by a heat-sealing machine. Sectional view showing the place where d is attached. Sectional view showing the place where the inside of the vacuum heat insulating material pack is depressurized by the vacuum chamber.

FIG. 4 is a cross-sectional view of the heat insulating box in one embodiment of the present invention.

FIG. 5 is a sectional view of a conventional vacuum heat insulating material pack.

FIG. 6 is an enlarged sectional view of a main part of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum insulation material pack 2 Core material 4 Container 6 Barrier material 8 Lid material

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-209700 (JP, A) JP-A-61-101789 (JP, A) JP-A-1-189479 (JP, A) 64089 (JP, U) JP-A 62-200578 (JP, U) JP-A 1-14996 (JP, U) JP-A 62-102093 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B32B 1/02 F16L 59/06

Claims (1)

(57) [Claims] (1) vacuuming a plastic laminate film;
Plastic-metal foil laminate on a part of the molded container
Attach barrier material consisting of film with heat seal
Filling the container with a core material having an open-cell structure
And then a lid made of plastic laminated film
Heat-sealing the periphery with a material and depressurizing the inside
Heating material pack manufacturing method.