JPS5995374A - 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 The present invention relates to a method for manufacturing a heat insulating box (VC), and particularly relates to a hard urethane foam having closed cells in a 1vr hot part of a freezer compartment, and a heat insulating part of a refrigerator compartment [an article with open cells]. This invention relates to a method of manufacturing a heat insulating box in which the total amount of heat insulating material used can be significantly reduced by using T-urethane foam.

Conventional insulation materials have been filled with high-quality urethane foam containing closed-cell metal, regardless of whether they are in the freezer compartment or the refrigerator compartment. In general, the insulation parts of refrigerators and freezers are rated at 30 to 5
It is designed at 0m11, and at that time, the specific gravity of the glue V
i0.028-0.03297'. l+", thermal conductivity is 0.0150 kcal/m-hc. However, in small refrigerators and other devices that do not require high performance such as cooling performance, insulation material performance is Insulation materials tailored to each of the freezer and refrigerator compartments are sufficient, thereby significantly reducing the amount of insulation used.

The object of the present invention is to fill the freezer compartment insulation part with rigid urethane foam having closed cells, and the refrigerator compartment insulation part with rigid urethane foam having open cells, so that the thermal conductivity of each part is adjusted according to the cooling performance of each part. The object of the present invention is to provide a heat insulating box body which can greatly reduce the amount of conventional heat insulating material.

That is, in general, in refrigerator-freezers, etc., the freezer compartment is operated at 118°C and the refrigerator compartment is operated at +3°C, and the insulation material performance at that time is one with a closed cell ratio of 80% or more and a thermal conductivity of 0.
0150 kcal/1n-h-0, specific gravity is 0,030
V/aTIs. However, as a result of examining the need for the insulation performance of the refrigerator compartment to be equivalent to that of the freezer compartment, at least
1 if the thermal conductivity is 0.029 kcal/1n-Ire or less. This eliminates the need for the hard urethane foam to form closed cells, and the open cell ratio is 9.
0% or more is sufficient, and the specific gravity is also 00159/a
Since the amount used is half that of NX and conventional methods, the amount of insulation material used as a whole can be significantly reduced.

Examples of the present invention will be described below. FIG. 1 is a cross-sectional view of conventional hard urethane foam filling, in which a front assembly assembled with an outer box assembly 1, an inner box 2, a ceiling plate 3, etc., a freezer compartment 11, and a refrigerator compartment 12 are partitioned. A hard urethane foam 7 having closed cells σ is injected from the injection port 4 into the space defined by the styrofoam 6.
The foam is completely filled by releasing gas at the filling gas vent 9 in accordance with the foam flow direction 8. FIG. 2 is a sectional view of the present invention during filling, and the pre-assembly refilling method is the same as the conventional method, but in particular, the freezing compartment 11 and the refrigerator compartment 12 are completely separated by the partition styrofoam 9. Freezer compartment 11 has a closed cell ratio of 8.
Rigid urethane foam 7 having a temperature of 0 or more, refrigerator compartment 12
Hard urethane foam with an open cell ratio of 90 cm or more is used for each 7j: Slo A Kishi 74.11 Han f - 1 I Roku Omakatsu - Person μ H I - I injection) 1 Upper Han No IJ Kohare The gas is completely filled by releasing the gas through the gas vent 9 provided in each C4. FIG. 3 is a cross-sectional view of the present invention after filling.

According to this embodiment, if hard urethane foam with a closed cell ratio of 80 cm or more is used for the freezer compartment insulation part, the thermal conductivity is 0.0.
150 kcal/in・h'o, specific gravity 0.0309/
cms.

If rigid urethane foam with an open cell ratio of 90% or more is used for the insulation part of the refrigerator compartment, the thermal conductivity will be 0.0.29 kcal/
A 1n-1 C specific gravity of 0.0159/cms was obtained.

As a result, the filling volume ratio of the freezer compartment and the refrigerator compartment is 30 cm and 70 cm, so the total amount of 1 ljr heat material used is 100 cm of conventional hard urethane foam with closed cells.
It has the effect of reducing the total amount used by 35% compared to when using %.

1. It was confirmed that the cooling performance on the refrigeration side is operating normally with almost no change from before.

According to the present invention, the amount of heat insulating material used can be significantly reduced, resulting in a cost reduction effect. Moreover, since the refrigerator compartment insulation part is made of open-cell hard urethane foam (17'), problems such as denting of the appearance when the refrigerator is warmed do not occur, so that the M design quality can be further improved.

Furthermore, since the foam is open-celled, the foaming pressure is less than half that of closed-cell foam, making it easier to seal urethane leaks inside the box, and reducing production costs for foam layers, etc.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the conventional JM filled with hard urethane foam, and Figure 2 is a cross-sectional view of the JM filled with hard urethane foam of the present invention.
The ft view and FIG. 3 are cross-sectional views after filling the hard urethane/noohm of the present invention. l - Outer box assembly (back plate), 2... Inner box, 3 - Ceiling plate, 4 - Inlet, 5 - Injection head, 6... Inner partition Styro 7 ohm, 7 - Closed cell rigid Urethane foam, 8--Foam flow direction, 9...Gas vent hole, 1
゜・Continuous cell urethane foam, 11.. Freezer room, 12.. Refrigerator room. Figure/Figure

Claims (1)

[Claims] 1. In an insulating box body formed by filling the space created by combining the outer box and the inner box with foamed insulation material by foaming in-situ, etc., the insulating part called the so-called freezer compartment has 80 or more independent A method for producing a heat insulating box, characterized in that a heat insulating section called a refrigerator compartment is filled with a hard urethane foam having an open cell rate of 90% or more.