JPH04203787A - Thermal insulating door - Google Patents

Abstract

PURPOSE:To prevent a deformation of an inner plate of a door while coating material is being peeled off the inner plate of the door by a method wherein peeling coating material having as its major substance water-soluble vinyl high molecule is coated at a location where an occurrence of clearance is expected at a foam thermal insulation material of the inner plate of the door. CONSTITUTION:Peeling coating material having as its major substance water-soluble vinyl high molecule is coated at foamed thermal insulating material 6 at portions 5a and 10a marked with net-like marks in an rear of 1.5 to 2.0 times of that of clearance generating part. A thermal insulating door 1 is taken out of a foaming jig, cooled down to a room temperature, the thermal insulating door 1 is fixed to a refrigerator or the like and an inside of the refrigerator is cooled, resulting in that gas pressure within the clearances 5 and 10 is reduced and a suction force for the foam thermal insulating material 6 may act against the inner plate 3 of the door. However, since the peeling-off coating material is applied to the locations 5a and 10a where the clearance may be expected, a suction force more than a predetermined amount acts against it, the coating material is peeled off the inner plate 3 of the door and then the surrounding air is fed into the space between the coating material and the inner plate 3 of the door through gas drain holes or the like, resulting in that any deformation of the inner plate 3 of the door can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to an insulating door using an injection foam type foam insulation material for use in food storages such as refrigerators.

BACKGROUND ART FIG. 3 is an external perspective view of a heat insulating door applied to a conventional and uninvented embodiment.

Generally, the insulation R1 is the door outer panel 2, the door inner panel 3, as shown in Figure 3.
and a door frame, and a foamed heat insulating material 6 (not shown) is injected into the constructed space and foamed to form an integral structure.

The door inner plate 3 has a bulge 3b for forming a recess 3a corresponding to a storage case (not shown).
A rib 3c is formed between the ribs 3c for reinforcing the door inner plate 3 or supporting the storage case.

Then, when filling the foamed heat insulating material 6, as shown in FIG.
), a foamed inner jig 8 that matches the shape of the inside of the refrigerator of the n-inner plate 3 is placed inside the foamed outer jig 7 of the lower part that is divided into two upper and lower parts, with the n-inner plate side facing upward. Place it on the inner jig 8.
Attach the door inner plate 3 with the chamber side facing down so that the door inner plate 3 is attached to the front plate. Next, the stock solution 6a of the foam insulation material 6 is injected into the approximate center of the lip 3d on the lower side of the n inner plate 3, and as shown in FIG. 2(b), by the time the stock solution 6a starts foaming, The door frame 4 and the door outer panel 2 are installed in this order on the door inner panel 3 in the outer jig 7, and the upper foam outer jig 9 is placed and fixed thereon, and the preheated foam outer jig is placed on top of the door frame 4 and the door outer panel 2. The components of the heat insulating door 1 are heated by the tools 7 and 9 to complete the foaming and curing reaction of the stock solution 6a.

<Problem to be solved by the invention> However, in order to reduce the amount of foamed insulation 6 used, reduce the foaming pressure, and simplify the foaming jig to reduce manufacturing costs, the foamed insulation 6 has recently been overused. The filling rate is reduced. Therefore, the foaming agent scattered from the air in the heat insulating space and the foaming agent scattered from the stock solution 6a is located at the upper end portion 10 of the bulge portion 3b and near the center 5 of the rib 3c, where the flow distance from the injection point of the stock solution 6a is the longest. A gap is generated due to a gas pocket of the mixed gas. By providing a large number of gas vent holes around the location where gas pools occur, or by increasing the diameter of the gas vent holes, gas can be easily removed and gas pools can be reduced or eliminated. but,
Due to the appearance, MaO et al. cannot be carried out, and there is a problem that the above-mentioned gas pocket portion causes sudden deformation of the unfilled foamed heat insulating material 6, which reduces the marketability.

The present invention has been made to solve such problems, and before injection of the foam insulation material, peeling is performed in the foam insulation material on the foam insulation material side of the door inner panel at locations where voids are expected to occur. When the heat-insulating door is cooled by being attached to a refrigerator, etc., the pressure in the gap decreases, and a suction force is applied to the inner plate, the paint peels off from the inner plate of the door. An object of the present invention is to provide a heat insulating door that can prevent deformation of the door inner plate.

In order to achieve the above object, this invention consists of a door outer panel, a resin door inner panel disposed opposite to the door outer panel, the n inner panel and the above-mentioned inner panel. In an insulated door that is composed of a door frame that surrounds the entire circumference of the door outer panel, and is integrally molded by filling the formed space with a foam insulation material, this foam insulation on the foam insulation material side of the door inner panel It is characterized in that a releasable paint containing water-soluble vinyl polymer as the main component is applied in advance to areas where voids are expected to occur in the material.

Effect> In the above configuration, when the insulation body is cooled and the voids in the foam insulation material contract, and a suction force is applied to the foam insulation material side on the door inner plate, the releasable paint peels off from the n inner plate, Since the foamed heat insulating material in the area coated with the releasable paint and the door inner plate are separated, local dents in the gaps in the n inner plate are eliminated.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Figure 1 is a perspective view of the N inner plate viewed from the foam insulation material, where the portion 5a marked with a mesh and the foam insulation material 6 side of the loa are peeled off containing water-soluble vinyl polymer as the main component. Sex paint 11
(not shown) for 20 minutes using a brush or spray gun, etc.
Apply to a thickness of ~30 mm over an area 1.5 to 2.0 times the area where the voids occur.

FIG. 2(a) is a diagram showing a state just before the foamed heat insulating material is injected into the insulation n, and FIG. 2(b) is a diagram showing the state after the foamed heat insulating material is filled into the heat insulating door.

As shown in FIG. 4, a removable paint 11 is applied to the mesh portions 5a and 10a, and then the paint 11 is dried on the door inner plate 3.
As shown in FIG. 2(a), place the foam insulation material side up on the foam inner jig 8, and pour the stock solution 6 of the foam insulation material into the bulged portion 3d.
Inject a predetermined amount of a. Then, before foaming of the stock solution 6a starts, the door frame 4, the door outer panel 2, and the foaming outer jig 9 are placed in this order as shown in FIG. 2(b), and the lower foaming outer jig is The jig 7 and the upper foamed outer jig 9 are fixed, and the jig 7 is preheated.
．． 9, the n-inner plate 3 and the n-outer plate 2 are heated to complete the foaming and curing reaction of the stock solution 6a.

FIG. 4 is a sectional view taken along the line A-A in FIG.
, 3c is filled with air that existed in the insulation space that did not escape through the gas vent hole (not shown) when filling the foam insulation material 6, or with foaming agent that leaked from the stock solution 6a of the foam insulation material during the foaming process. Gaps 5 and 5.5 are formed by certain fluorocarbon gas and carbon dioxide gas. A similar void 10.10 is located in the bulge 3
It is also formed at the upper end of b.

Then, when the insulation n1 is taken out from the foaming jig and cooled to room temperature, and the insulation n1 is further attached to a refrigerator or the like to cool the inside of the refrigerator, the gas pressure in the gap 5.10 decreases,
A suction force acts on the door inner plate 3 toward the foam insulation material 6 side. However, the releasable paint 11 is applied to the predicted void occurrence location 5a and IQa.
Since the paint is applied, when a suction force of a predetermined amount or more is applied, the paint 11 will peel off from the door inner plate 3, and outside air will be introduced between the paint 11 and the door inner plate 3 from the gas vent hole etc. Therefore, deformation of the door temporary 3 is prevented.

In addition, since the removable paint 11 is mainly composed of water-soluble polyvinyl alcohol resin to which a plasticizer, rust preventive agent, etc. It does not have any negative effects such as causing bubbles to break, and since it is water-soluble, it can be used to dissolve the resin door inner plate 3 with a solvent.
It also prevents cracks from forming in areas where strain remains.

<Effects of the Invention> Since the present invention is configured as described above, deformation of the door inner plate due to contraction of the voids in the foamed heat insulating material can be prevented. Furthermore, since the releasable paint is water-soluble, there is no adverse effect on the interior of the foam insulation material, and since no solvent is used, there is no risk of contaminating the working environment.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the door inner plate according to the present invention viewed from the foam insulation material, Fig. 2(a) is a diagram showing a state on the verge of injecting the foam insulation material into the insulated door, and Fig. 2(b) ) is a diagram showing the state after filling the insulation door with foam insulation material, FIG. 3 is an external perspective view of the insulation door applied to the conventional and one embodiment of the present invention, and FIG. 4 is the state shown in FIG. 3. It is an AA sectional view. 3: R inner plate, 3b: H exit part, 3c, 3d: rib, 5.10: void, 5a, 10a: peelable paint application part, 6: foam heat insulating material. Agent Patent attorney Ume 1) Katsu (and 2 others) Figure 2 (
h＞

Claims (1)

[Claims] 1. A door outer plate, a resin door inner plate disposed opposite to the door outer plate, and a door frame that surrounds the entire periphery of the door inner plate and the door outer plate. In an insulated door that is integrally molded by filling the formed space with a foam insulation material, the area on the foam insulation material side of the door inner plate where voids are expected to occur in the foam insulation material. A heat insulating door characterized in that a releasable paint containing a water-soluble vinyl polymer as a main component is applied in advance.