Vacuum insulation material, insulated box, and method for producing vacuum insulation material

摘要

The present invention involves covering a core material (10) comprising a fiber assembly with outer packaging (20, 21), and before depressurizing the interior of the outer packaging (20, 21), compressing the core material (10) and the outer packaging (20, 21) into one body by applying external force, and compressing to a compressed state in which the thickness of the core material (10) is 1/10 or less the thickness before compression, and then, while in the compressed state, forming weld-sealed sections (40) on at least two facing sides of the peripheral edge sections of the outer packaging (20, 21), and after forming the weld-sealed sections (40), depressurizing and sealing the interior of the outer packaging (20, 21).