JPH0233918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vacuum heat insulating material used as a part of a heat insulating wall of a refrigerator or the like.

Conventional technology Conventionally, vacuum insulation materials are manufactured by drying inorganic foamed powder such as crushed perlite to a moisture content of 1% or less, filling it into a film bag made of metal and plastic laminate, etc., and then putting the inside into a vacuum packaging machine. vacuum degassing and automatic heat sealing were performed to create vacuum insulation materials.

However, it was not possible to form the powder into the desired shape simply by filling the powder into a bag.

In order to achieve this required shape, for example,
As described in Japanese Patent No. 155996, it has been proposed to compact the outer shell under high pressure after forming a vacuum insulation material.

Problems to be Solved by the Invention However, pressing and compacting after vacuuming may damage the outer shell, and in this case, the outer shell loses its strength and communicates with the outside air, resulting in a loss of insulation performance. There is a problem. In addition, when vacuuming, the outer shell was forced to align with the outer surface of the powder, which caused the problem that the entire shell became hard and a considerable amount of force was required to compact it.

In order to solve the above-mentioned problems, the present invention provides a method for manufacturing vacuum insulation goods that allows easy molding work.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention fills an inorganic foam powder into a breathable inner bag made of paper or cloth, and then seals the open end of the inner bag with tape or adhesive. After closing, the inner bag is shaped by a press or the like, dried, and then inserted into an air-impermeable outer bag.The inside of the inner bag is depressurized and the opening end of the outer bag is sealed.

Function The present invention is a method in which an inner bag is filled with inorganic foamed powder, the opening is closed, and then molded, and then dried, and molding can be performed when the powder has moisture.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the figure, 1 is a vacuum pack insulation material, and 2 is an inorganic foam powder such as perlite (hereinafter referred to as powder).
It is. Reference numeral 3 denotes a breathable inner bag such as a paper bag, which is filled with the powder 2 and whose opening end face 4 is adhered with tape, adhesive 5, etc. to prevent the powder 2 from leaking.
Incidentally, after filling the powder 2 to match the size and shape of the vacuum pack heat insulating material 1, the inner bag 3 is suitably pressed to form a shape, and then dried. 6 is an outer bag made of a film bag made of metal and plastic laminate. Three sides are pre-sealed. Then, the inner bag 3 is inserted through the opening. 7 is a vacuum packaging machine, and 8 is a heat sealing machine installed in a vacuum chamber 9, which heat-seals the opening end face 10 of the outer bag 6 by sandwiching it therebetween. 1
1 is a welding plate of the heat sealing machine 8, and 12 is a vacuum pump of the vacuum packaging machine 7.

In the above configuration, as shown in FIG. 2, first, the inner bag 3 filled with the powder 2, shaped and dried is placed in the outer bag 6 which is sealed on three sides, and is fixed in the chamber 9 of the vacuum packaging machine 7. and the opening end surface 1 of the outer bag 6
0 is placed on the welding plate 11 of the heat sealing machine 8 and vacuum degassed. After the inside of the vacuum chamber 9 is degassed to 10 ^-2 Torr, the heat sealing machine 8 is activated, and the opening end surface 10 of the outer bag 6 is heat sealed.

Therefore, since the powder is molded when it has moisture, it is easy to form the mold. Additionally, since it is dried after being formed, it will not lose its shape, making it easier for the outer bag to conform.

Effects of the Invention As described above, in the present invention, an inner bag filled with inorganic foamed powder is shaped and dried, and then the inner bag is placed in an outer bag and vacuum degassed. Since it is molded, it can be formed into the required shape, making it easy to form.

Furthermore, since the outer shape of the inner bag is fixed, the outer bag can also easily follow the outer surface of the inner bag, making it easier to obtain the shape after vacuum degassing. Furthermore, since it is placed in an inner bag and molded, there is no need to take into account minute scratches caused by the press during molding. In other words, there is no risk of vacuum leakage due to scratches when the mold is placed in an outer bag and molded.

Furthermore, in the drying process, since the inner bag can be dried alone, a sufficient surface area can be obtained, and it has the advantage that uniform drying is possible.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a vacuum heat insulating material showing an embodiment of the present invention, and FIG. 2 is a sectional view of FIG. 1 before vacuum degassing. 2... Inorganic foaming powder (powder), 3... Nakabukuro,
4... Opening end surface, 5... Tape or adhesive, 6
...outer bag.

Claims (1)

[Claims] 1 Fill a breathable inner bag made of paper or cloth with inorganic foam powder, close the opening end of the inner bag with tape or adhesive, shape the inner bag with a press, etc., and then dry it. After that, the vacuum insulation material is inserted into a non-breathable outer bag, the inside of the material is depressurized, and the end surface of the opening of the outer bag is sealed.