VACUUM THERMAL-INSULATION MATERIAL, AND A DEVICE AND METHOD FOR ASSESSING THE DEGREE OF VACUUM IN THE VACUUM INSULATION MATERIAL BY USING THE FREQUENCY RESPONSE METHOD

摘要

According to one embodiment of the present invention, a thermal-vacuum insulation material has: a structure in which a rigid body that is thinner than a reference thickness or a getter that is stronger than a reference strength is formed between an external skin material and a core material in order to achieve smoothness and surface strength at the surface of the vacuum insulation material; or a structure in which a rigid body that is thinner than the reference thickness is formed on top of the getter that is formed between the external skin material and core material.