VACUUM HEAT INSULATING BODY, REFRIGERATOR, HEAT INSULATING PANEL, AND MANUFACTURE OF VACUUM HEAT INSULATING PANEL

摘要

PROBLEM TO BE SOLVED: To obtain an inexpensive, lightweight vacuum heat insulating body, in which a powder is not scattered when the body is broken up so that a refrigerator can be disposed of efficiently and a house can be effectively heat insulated and constructed by a method wherein the powder material of the body contains at least a hard urethane foam powder and powder aggregates are formed by heating and dehydrating the powder. SOLUTION: The vacuum heat insulating body 1 comprises an outer cover material 3 loaded with a core material 2 composed of a powder material, in which the material 3 is made up of plastic laminate films including metal foils or metal evaporation layers. And the material 2 is composed of a hard urethane foam powder, which is prepared by crushing an expanded material including air bubbles to form the powder into complex needle-like structures comprising air-bubble skeleton and air bubble films. And since adjoining powders interfere with one another, the insulating body has low density and can be dried by heat and at the same time, the powder aggregates are formed by being joinded.