Patent ID: 8790477

Claim:
A method of manufacturing a vacuum heat insulator comprising the steps of: heat fusing heat seal layers of first and second enveloping members, the first and second enveloping members comprising laminate films, and each of the laminate films comprising the heat seal layer and a surface protective layer, wherein heat is applied to every portion of the first and second enveloping members including portions of the first and second enveloping members in which a flat core member is present between the first and second enveloping members; and heat pressing every portion of the first and second enveloping members, including the portions in which the flat core member is present between the first and second enveloping members, by applying a force of 1 kg/cm 2 or more at the same time as the fusing step, wherein the heat pressing is performed at a fusing temperature of the heat seal layers, wherein the vacuum heat insulator comprises the first and second enveloping members and the flat core member and each of the first and second enveloping members comprises the heat seal layers, wherein the flat core member is sealed under reduced pressure between the first and second enveloping members, and the heat seal layers of the first and second enveloping members face each other, and wherein the first and second enveloping members are heat sealed at every portion of the first and second enveloping members that are in contact with each other.