JPS58200978A - Manufacture of heat-insulating door of cooling 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 The present invention relates to the manufacture of heat insulating doors for cooling boxes such as freezers and refrigerators, and particularly relates to the manufacture of heat insulating doors for cooling boxes such as freezers and refrigerators. In the case where foam insulation is filled on the back side of the exterior wall using the in-situ foaming method, the portion where the foam insulation solution discharged from the injection nozzle collides with the back of the front wall of the door exterior wall, and this collision. The shrinkage rate of the foamed insulation material is slightly different from the part where the raw solution spreads around the surrounding area and gradually begins to foam and becomes cream-like, so the surface wall of the outer door wall may be slightly deformed after foaming has finished. , we provide an insulated door that is devised to prevent this deformation, and also ensures that the insulating material does not stick to the outer surface of the door wall, and also prevents heat from the outer surface of the door from penetrating into the cooling box. The purpose of the present invention is to provide an insulating door that can have a structure that allows heat reflection.

Next, embodiments of the present invention will be described based on the drawings. (1) is the main body of the freezer as a cooling box, which has a heat insulating structure, and its front opening is opened and closed by a heat insulating door (2). The structure of the heat insulating door (2) and its manufacturing method will be described below. (3) is the outer wall of the door, and the front wall (4) forming the front of # (2) and the door (2)
It has a side wall (5) that completely forms a circumference lj [i, and is in the shape of a container that is open to the back surface. (6) is a flange extending inward from the end of the side wall (5), and is a door inner plate (forced and
) and the door (2). The door outer wall (3) is the front wall (4)
The 11111 wall (5) and the 7-lunge (6) may be formed by bending a single metal plate, and the 11111 wall (5) having the 7-lunge (6) may be made of synthetic resin and a separate metal plate. It may also be configured in combination with a front wall (4) made of (9) is a heat insulating material filled from the outer surface of the front wall (4) to the back surface of the body (3) using an in-situ foaming method. The film (9) is a synthetic resin film with a reflective layer such as aluminum formed on the surface of the front wall (4), or a translucent film with a reflective layer such as aluminum formed on the heat insulating material uI side of a transparent film. Further, a film of about 7# made of aluminum itself is suitable. The film (9) is preferably resistant to fluorocarbon gas contained in the heat insulating material 01,
Also, insulate the front wall (4) of the door outer wall (3) □ to prevent the injected stock solution from directly hitting the front wall (4) when injecting the raw material solution from the nozzle αυ. A plurality of holes Q3 are formed in the film around a relatively wide planar area 0, which is indicated by a dotted line and has no holes, and the radius of this area is approximately 20cIIX.

The method for manufacturing the door (2) may include bonding the outer wall (3) of the door to a predetermined shape and the peripheral edge of the door (9) with tape. In this state, install the lower jig for foaming (141 as shown in Figure 3) and insert the nozzle a1.
f! r: The stock solution of the heat insulating material OG is injected from the nozzle into the back space in the door outer wall (3) in correspondence with the center of the flat part α without holes provided in the center of the film (9).

During this injection, the stock solution discharged from the nozzle αυ is a film (
It collides with the flat part a3 of 9) and flows directly over the flat part α. The flow of this stock solution begins to foam near the end of the planar portion a by the fluorocarbons contained in the stock solution, becoming cream-like with fine bubbles, entering the hole 01, and further spreading to the surrounding area. On the other hand, after injecting a certain amount of the stock solution, the upper jig α9 for foaming is combined to cover the back opening of the door outer wall (3), and as the foaming progresses, the insulation material OI becomes the door outer wall (3). and the upper jig for foaming a5.

After this filling, remove the upper jig for foaming (IS) and remove the door outer face (3).
After removing it from the lower foaming jig a, fix the periphery of the door inner plate (7) to the 7 langes (6) with screws or the like so as to cover the heat insulating material 0I. Along with this fixing, a gasket (8) is attached to the 7 lange (6). In the above configuration, the hole Q3 is for sufficient adhesion between the heat insulating material OI and the front wall (4) of the door outer wall (3), and is intended to further improve the adhesion and improve the heat reflection effect. In order to prevent damage, the size of the film (9) is slightly smaller than the size of the front wall (4), and the insulation material 0I is placed around the film (9) on the front wall (
4), covering most of the back surface of the front wall (4).

゛ As described above, the present invention has a relatively wide flat part without holes in the injection part of the stock solution of the foamable heat insulating material, and the stock solution of the foamable heat insulating material is directed toward the center of the flat part. The foamed heat insulating material is injected into the back surface of the outer wall of the door. For this reason, the stock solution of the foamable heat insulating material injected from the nozzle collides with the flat surface of the film and spreads in all directions, so the state where the stock solution flowing out from the nozzle hardly starts foaming is within the range where it flows on the flat surface. In this case, there is no adhesion between the front wall of the door outer wall and the heat insulating material, and if foaming has started to some extent and the heat insulating material is in good condition, the heat insulating material will be bonded to the front wall at the outer hole portion of the flat part and the outside thereof. Therefore, since the bonding between the surface wall and the heat insulating material is carried out in the area where foaming has started to some extent, if the raw solution discharged from the nozzle is directly adhered to the surface wall, the shrinkage rate will be lower than that in the area where foaming has started to some extent. Uneven deformation of the surface wall caused by the difference can be prevented. In addition, since the film adheres the heat insulating material and the front wall through the holes formed on the outside of the planar part, the above-mentioned problems occur when almost the entire surface of the front wall is separated from the heat insulating material by the film. Stickiness on the surface wall can be prevented. Furthermore, since the film has a heat-reflecting structure, it has the effect of suppressing heat from entering the cooling box from outside the heat-insulating door, which is preferable in terms of cooling effect.

The heat insulating door manufactured in the present invention can achieve the above-mentioned effects by using the film,
If the film is a synthetic resin film with a reflective layer formed thereon, it is less likely to be damaged during handling than an aluminum film.

[Brief explanation of the drawing]

The figures relate to the present invention; FIG. 1 is a front perspective view of a freezer, and FIG. 2 is a cross-sectional view of a back heating door with a film pasted on the outside wall of the door. (1)...Cooling box body, (2)...Insulation door, (3)...Door outer wall, (4)...
...Front wall, (9) ...Heat reflective film,
0 [・・・・・・Foam insulation material, αυ・・・・・・
Nozzle, (121... flat part, α cap...
- Hole. Agent Patent Attorney Shizuo Sano 15.゛. 1. . '\-'-1 Figure 1 Figure 2 Figure 3 Figure 4 I゛ 5 Figure rod f; Figure

Claims (1)

[Claims] 1. A heat insulating door that opens and closes the opening of a cooling box body, which has a front wall and a side wall and has an open back surface, is combined with a foaming jig to form foam insulation on the back side of the door outer wall. In a device in which the material is filled by an in-situ foaming method, the part where the raw solution of the foaming insulation material is injected has a relatively wide flat part without holes, and the foaming insulation material is poured toward the center of the flat part of the flat part. A method for manufacturing a heat insulating door for a cooling box body, which comprises injecting a stock solution of the material and filling the back surface of the outer wall of the door with a foamable heat insulating material.