JPS60185082A - Manufacture of heat insulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a heat insulator for the body and door of a refrigerator.

Generally, the main body and door of a refrigerator are made by injecting foamed 1-fat insulation material (hereinafter referred to as foaming material) into the cavity of a hollow casing made of a metal plate or synthetic resin plate. .

However, in order to take advantage of the insulation effect, the thickness of the foamed resin layer must be increased, and the external size will become larger compared to the internal capacity.
Problems with design constraints and installation space arise.

It is known that by forming a vacuum layer within a foamed resin material, a sufficient insulation effect can be obtained even with a thin wall thickness, and a refrigerator with a large capacity compared to its external size can be manufactured. However, a technique for foaming a foaming raw material in a cavity and forming a hollow vacuum layer within the foamed resin material thus formed has not been established.

As one step closer to a heat insulator with a hollow vacuum layer, inorganic foam powder (
The heat insulating member 153 is filled with 521 and maintained in a vacuum state in the bag (5) (with a bleached material supported in a medium weight in the cavity and a heat insulating foam material (6) foamed in the cavity). ) There is a heat insulator that surrounds the
No. 187).

However, the above-mentioned heat insulator requires time and effort to fill the bag with foam powder, and heat transfer occurs due to contact between the inner surface of the bag and foam powder, and contact between foam powders, so it is difficult to ideally form a hollow vacuum layer within the wall. There was a gap.

〔the purpose〕

The present invention forms a vacuum layer without filling in a foamed resin material,
An object of the present invention is to provide a heat insulating body having an excellent heat insulating effect even if the wall thickness is thin.

[Structure] ゛The raw material for the foam insulation material is foamed on the outside of the bag (5) which is placed in a cavity and expanded by filling with compressed fluid, and the outside of the bag is covered with the foamed resin material (6). At the same time, the foamed resin material (6) is solidified on the surface of the bag (51).
) is maintained in a vacuum state to form a hollow vacuum layer within the foamed resin material.

[°action and effect]

When foaming the foaming raw material, the bag is filled with fluid, so the bag will not be crushed by the foaming pressure.

In addition, after foaming is completed, the foam material adheres to the bag surface and solidifies, supporting the shape of the bag, so the fluid inside the bag can be drained and the inside of the bag can be created as a vacuum chamber, which has a heat insulation effect even if it is thin. An extremely excellent heat insulating body is formed, and the weight of the heat insulating body can be reduced.

The present invention will be specifically described below based on the male side of the figure.

Figure 1 shows a refrigerator door (1) manufactured by the method of the present invention.
), but the present invention is not limited to this, and can be implemented in the manufacture of heat insulators such as refrigerator bodies (121, architectural heat insulating panels, etc.).

The refrigerator door (1) has a foamed resin material (6) wrapped in a hollow casing formed by a top plate (2), a back plate +3], and an outer peripheral end plate (4), and a foamed resin material (6) that is forms a hollow vacuum layer (9) that is flat in the direction of the plate surface of the door and slightly smaller than the plate surface.

A gasket (11) is mounted on the outer periphery of the back surface of the door, and a shelf (31) is molded with resin on the back plate (3).

Next, I will explain the manufacturing method of the second door.

First, the back plate (3) is fitted into the lower mold (81) of the split mold (8), and the foaming raw material gull is injected from above the back plate (3). The foaming raw material in the example is a mixture of two liquids: isocyanate and polyol.

Next, an end plate (4) is installed around the outer periphery of the top plate (2), and a hollow flat bag (
5) is supported, and a stay (7) is attached to the bottom of the bag (5).
) is attached onto the back plate (3), and the lower stay (7) is applied to the inside of the back plate (3) to form a cavity between the back plate (3) and the member. form.

The bag (5) is made of aluminum foil or a thin stainless steel plate with a thickness of 30 to 50 μm, and is slightly smaller in area than the top plate (2), and has a space thickness (91) of about 2 cm.

A resin coating layer with excellent adhesion is applied.

A fluid inflow pipe (51) is protruded from one end of the bag (5), and as described above, the member (10) including the bag (5)
When the inflow pipe 61) is placed on the back plate (3), the inflow pipe 61) is inserted into the lower mold 81).
The outside of the mold (8) emerges from the notch (81a) and is connected to a hose H for supplying and discharging pressurized air.

The stay (7) has circular contact plates qz (72) protruding from both ends of the short axis ff1), and is adhesively fixed to the inner surface of the top plate (2) and the bag (5).

The quotient of the stay (7) is approximately 1.5 marks.

Next, pressurized air is supplied from the hose H into the bag (5). The pressure of the pressurized air may be such that the bag (5) is not crushed by the pressure of foaming the foaming material field in the cavity.

During the above operation, the foaming material (90) continues to foam within the cavity, and the foaming material (6) covers the outer periphery of the bag (5). The outer surface of the bag (5) is roughened or coated with a resin coating, so that the foamed resin material does not come into contact with the bag.

A-hI+ A: Dimension l'1 g81jl, ('A)
119 Large O J-/< +7 Ge1 sun tM +5
−+ sr −I will be transformed.

Foaming is completed in 4 to 5 minutes after the foaming raw material is injected, and the foaming is approximately 30 times larger.

Next, before or after removing the finished door from the mold (8), remove the air inside the bag (5) to create a vacuum state.
1) is cut to the remaining length and the flow path to the bag (5) is closed.

As mentioned above, insulation 4. 'l' + (3) and the bag (5) are firmly connected together, and the insulation material (6) is attached to the top plate (2).
Since it is also adhesively bonded to the back plate (3), the bag (5) will not collapse even if the air is removed from the bag (5).

Through the above steps, a refrigerator door having an extremely excellent heat insulating effect having a vacuum hollow layer in the heat insulating resin layer is completed.

In carrying out the present invention, the fluid to be filled in the bag (5) is not limited to air, and may be other gases or liquids, and the present invention is not limited to the above configuration (as described in the patent claims). Of course, various modifications are possible within the technical scope described in the range.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a refrigerator door, FIGS. 2 and 3 are explanatory views of the process order, and FIG. 4' is a sectional view of a conventional example. (5)... Bag (6)... Foamed resin material (9)
・Hollow

Claims (1)

[Claims] ■ The raw material for the foam insulation material is foamed on the outside of the bag (5) which is placed in the cavity and expanded by filling with compressed fluid, and the outside of the bag is covered with a foamed resin material (6). At the same time, the foamed resin material (6) is solidified on the surface of the expansion bag (5), and then the fluid inside the bag (5) is discharged to maintain the bag (5) in a vacuum state, creating a hollow vacuum inside the foamed resin material. layer(
9) A method for manufacturing a heat insulating body, characterized by forming. '1 ■ The method for manufacturing a heat insulating body according to claim 1, wherein the fluid is air. (2) The method for producing a heat insulator according to claim 1 or 2, wherein the bag is formed of a thin metal plate such as aluminum foil or stainless steel plate. (2) The method for manufacturing a heat insulating body according to any one of claims 1 to 3, wherein the heat insulating body is a door of a refrigerator. (2) The method for manufacturing a heat insulating body according to any one of claims 1 to 3, wherein the heat insulating body is a main body of a refrigerator.