JPS6078276A - Manufacture of heat-insulating box body - 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 Field of Industrial Application The present invention relates to a method for manufacturing a heat insulating box used for refrigerators, etc., and in particular to a method using a vacuum heat insulating pack as a heat insulating material, and this pack is used as a plastic inner box. This relates to a method of manufacturing by fixing it at a predetermined position.

Page 2 shows the structure of the conventional example and its problems. Figure 1 shows a partial cross-sectional view of the insulation box in the conventional example, where 1 is a plastic inner box, 2 is an outer box, and 3 is a vacuum insulation pack. . The vacuum insulation pack 3 is fixed to the inner box 1 with double-sided tape for temporary fixing, and in this state, a foamed insulation material 5 (hereinafter referred to as urethane) is injected and foamed into the space between the plastic inner box 1 and the outer box 2. . However, as is well known, there are wrinkles 3a on the surface of the vacuum insulation pack 3, and these wrinkles 3a create a gap 3b between the vacuum insulation pack 3 and the inner box 1.

Therefore, there is a drawback that the gap 3b between the vacuum insulation pack 3 and the inner box 2 contracts or expands during cooling operation or when the outside temperature changes, causing deformation of the inner box 1 such as denting or swelling.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims to eliminate the gap between the inner box and the vacuum insulation pack.

Structure of the Invention In order to achieve the above object, the present invention creates a separate piece that matches the shape of the step or undulating part of the lip of the 3-page net of the inner box, and connects the separate piece with a vacuum. The insulation pack is adhered with double-sided tape, etc. to make an integrated product of the separate piece and the vacuum insulation pack, and the integrated product is fixed to the above-mentioned stepped or undulating parts of the inner box, and urethane is injected and foamed to seal the surface of the vacuum insulation pack. This eliminates the gap between the inner box and the inner box, and prevents the inner box from deforming due to cold/hot cycles.

DESCRIPTION OF EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to FIGS. 2, 3, and 3. Note that the same reference numerals as in FIG. 1 indicate the same parts, and a description thereof will be omitted.

In the figure, an inner box 1 is provided with a lip 1a as a protrusion for supporting a net (such as a net shelf). Reference numeral 6 denotes a separate piece pre-molded of styrofoam or the like and has a protrusion 6a that matches the lip 1a.

Next, the method for manufacturing the heat insulating box is to first fix the vacuum heat insulating pack 3 to the separate piece 6 with double-sided tape 4, then insert the protrusion 6a into the lip 1a of the inner box 1 and temporarily fix it with the double-sided tape 4.

Then, this inner box 1 is assembled into an outer box 2, and urethane 5 is injected into the space between the two boxes 1 and 2 and foamed.

Thereby, a gap is widened between the vacuum insulation pack 3 and the inner box 1, and the vacuum insulation pack 3 is placed at a predetermined position without movement. Therefore, deformation of the inner box 1 due to cold/hot cycles can be prevented.

Effects of the Invention As described above, in the present invention, a separate piece that matches the shape of the protrusions and undulations of the lip of the inner box is prepared in advance, and a vacuum insulation pack is adhered with double-sided tape. A separate piece is placed in the inner box above, and a foam insulation material is filled between the inner and outer boxes.This eliminates the gap between the inner box and the vacuum insulation pack, and prevents deformation of the inner box that occurs during cold and hot cycles. Furthermore, the mounting position of the vacuum insulation pack can be easily determined by using the protrusions and undulations of the inner box.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part of a conventional heat insulating box body, Fig. 2 is a sectional view of the main part of a heat insulating box body according to the manufacturing method of one embodiment of the present invention on page 6, and Fig. 3 is a sectional view of the main part of the heat insulating box body used in the same manufacturing method. It is a sectional view of a separate piece and a vacuum insulation pack. 1...Inner box, 1a...Rip (projection or undulation), 2...Outer box, 3...Vacuum insulation pack, 5... ...Urethane (foam insulation material),
6... Separate piece. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 -387-

Claims (1)

[Claims] It consists of an outer box, a plastic inner box spaced apart from the outer box, and a foam insulation material filled between these two boxes. Create a separate piece in advance that matches this shape for this step or undulation, glue the separate piece and the vacuum insulation pack, and place the separate vacuum insulation pack in the designated position of the inner box. A method for producing a heat insulating box body, in which the foamed heat insulating material is filled and foamed between the inner box and the outer box after being fixed via pieces.