JPH07137047A - Manufacture of heat insulation body - Google Patents

Abstract

PURPOSE:To produce safely a product without having a hazard such as an explosion or a fire in a foaming process, by providing a communication port performing vacuum evacuation on a jig. CONSTITUTION:A vent hole 11 comprised of a small hole is formed in the rear of an inner ply 9 also and a communication port 10 and the vent hole 11 become coincident with each other. A foaming heat insulation material 12 is cast between outer ply 8 and inner ply 9, foamed and cured. A nozzle 13 for vacuum drawing is installed on a position coincident with the communication port 10. An evaporated hydrocarbon to be generated in a manufacturing process is vacuum-evacuated from the vent hole 11 by a vacuum drawing nozzle 13. Consequently, even if the foaming heat insulation material 12 for which such a substance that has explosive properties like the hydrocarbon is used by taking as a foaming agent is not foamed, it is eliminated that the evaporated hydrocarbon is dwelt within the heat insulation box body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a heat insulator such as a refrigerator.

[0002]

2. Description of the Related Art In recent years, for foaming a heat insulating material such as a refrigerator, a heat insulating material foaming jig is used to fix an outer plate and an inner plate of the heat insulating material and prevent deformation of the plate material during foaming. A manufacturing method is performed.

Hereinafter, a conventional method for manufacturing the above-mentioned heat insulator will be described with reference to the drawings. 2 (a), (b), (c)
FIG. 4 is a schematic view showing a conventional foam insulation material filling step.

Reference numeral 1 denotes a lower jig, which discharges a raw material 4 from a foaming heat insulating material raw material discharge device 3 to an inserted and fixed metal outer plate 2. Next, the upper jig 6 having the resin-made inner plate 5 inserted and fixed therein is lowered to be fitted to the lower jig 1. The foamed heat insulating material 4 is provided between the outer plate 2 and the inner plate 5 thus combined.
a is foam-filled.

The lower jig 1 and the upper jig 6 have a role of preventing the heat insulating body from being deformed by the foaming pressure generated during the foaming and preventing the foamed heat insulating material from leaking from the heat insulating box. The inner plate 5 is provided with a vent hole 5a for removing a gas such as a foaming agent generated during foaming.

In recent years, it has been proposed to stop using CFCs that destroy the ozone layer as a foaming agent of a heat insulating agent, and use hydrocarbons that have no ozone layer destruction as a foaming agent.

[0007]

However, in the method for manufacturing a heat insulator as described above, in the case where the gas flowing out from the vent hole 5a stays in the jig and flammable hydrocarbon is used as the foaming agent. There is a risk that the concentration will reach the explosion range.

Further, the natural outflow from the vent hole 5a cannot sufficiently exhaust the hydrocarbons in the heat insulating box, and the vaporized hydrocarbons stay in the heat insulating box, and during production of this heat insulating box. Explosion risk involved.

In view of the above problems, the present invention has no risk of explosion or fire in the foaming process even when a foamed heat insulating agent using flammable hydrocarbon as a foaming agent is foamed and the product is safe. It is an object of the present invention to provide a method for manufacturing a heat insulator that can be produced at any time.

[0010]

The method of manufacturing a heat insulating body according to the present invention is such that the outer circumference of a pair of walls is covered with a jig and a heat insulating material is filled and foamed between the walls using hydrocarbon as a foaming agent. The jig is provided with a communication port for vacuum evacuation.

[0011]

Therefore, according to the present invention, the vaporized hydrocarbon in the heat insulating body can be surely exhausted from the vent hole by evacuation.

Further, by evacuating from the communication port provided in the jig, the vaporized hydrocarbon flowing out from the vent hole provided in the heat insulator is quickly discharged to the outside of the jig in the process of foaming of the foam insulating material. it can.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a schematic sectional view of a part of the heat insulating material foaming step. Reference numeral 7 is a heat insulating material foaming jig composed of an upper jig 7a and a lower jig 7b. The upper jig 7a and the lower jig 7b are not shown in order to accurately align the outer plate 8 and the inner plate 9. The locating pins fit together.

Reference numeral 10 is a communication port formed in the upper jig 7a. Further, a vent hole 11 formed of a small hole is also formed on the back surface of the inner plate 9 so that the communication port 10 and the vent hole 11 are aligned with each other.

The vent hole 11 is connected to the outer plate 8
When it is formed in the above, the communication port 10 can be formed in the lower jig 7b.

Reference numeral 12 denotes a foam heat insulating material, which is injected and foamed and solidified between the outer plate 8 and the inner plate 9. Reference numeral 13 denotes a nozzle for drawing a vacuum, which is installed at a position corresponding to the communication port 10.

In such a case, the vaporized hydrocarbon generated in the manufacturing process of the heat insulator is evacuated from the vent hole 11 by the vacuuming nozzle 13, and as a result, the explosive substance such as hydrocarbon is used as the foaming agent. Even if the used foamed heat insulating material 12 is not foamed, vaporized hydrocarbon does not stay in the heat insulating box body 14.

Further, since the hydrocarbon contained in the foamed heat insulating material 12 vaporized during the foaming of the foamed heat insulating material 12 as a foaming agent flows out from the vent hole 11 into the heat insulating material foaming jig 7, Vacuum drawing nozzle 13
Thus, even if the vaporized hydrocarbon is exhausted from the communication port 10 and, as a result, the foamed heat insulating material 12 that uses an explosive substance such as hydrocarbon as a foaming agent is foamed, the space between the outer plate 8 and the inner plate 9 is increased. , And vaporized hydrocarbon does not stay in the heat insulating material foaming jig 7.

Therefore, it is possible to produce a safe heat insulating body in which vaporized hydrocarbon does not stay in the heat insulating box 14. Further, it is possible to prevent the concentration of the vaporized hydrocarbon in the heat insulating material foaming jig 7 from reaching the explosion range, and to prevent the surrounding destruction due to the explosion of the foaming agent. Further, the vacuum exhaust allows the hydrocarbons to be exhausted quickly, so that productivity and safety can be improved.

[0021]

As is apparent from the above-described embodiments, the present invention provides a safe heat insulator by evacuating vaporized hydrocarbon, which is a foaming agent having flammability, from a vent hole provided in a plate of a heat insulator. Can be obtained. Also, by exhausting the vaporized hydrocarbon, which is a flammable foaming agent, from the communication port provided in the jig, the concentration of hydrocarbons in the jig does not reach the explosion range, and safety and productivity are improved. Good insulation foaming.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a part of a heat insulating material foaming step showing an embodiment of the present invention.

FIG. 2A is a cross-sectional view showing a state where raw materials are filled in a conventional heat insulating material foaming step, and FIG. 2B is a state before an inner jig and an outer jig are combined in the conventional heat insulating material foaming step. The cross-sectional view shown is a cross-sectional view showing a state in which an inner jig and an outer jig are combined by a conventional heat insulation foaming method.

[Explanation of symbols]

 7 Heat insulating material foaming jig 7a Upper jig 7b Lower jig 8 Outer plate 9 Inner plate 10 Communication port 11 Vent hole 13 Vacuuming nozzle

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technology display location B29L 9:00 (72) Inventor Takushi Okamoto 3-22 Takaidahondori, Higashiosaka-shi, Osaka Matsushita Refrigerator Co., Ltd. (72) Inventor Hiroki Kawabata 3-22 Takaidahondori, Higashiosaka City, Osaka Prefecture Matsushita Refrigerator Co., Ltd.

Claims (1)

[Claims] 1. A jig formed by covering an outer circumference of a pair of walls with a jig and filling and foaming a heat insulating material such as pentane or cyclopentane as a foaming agent between the walls, which is evacuated to the jig. A method for manufacturing a heat insulator having a communication port.