PRODUCTION OF VACUUM INSULATING MATERIAL CORE

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a vacuum insulating material core which can save a manufacturing expense and improve the properties of an insulating material. SOLUTION: A method for producing a vacuum insulating material core comprises a stage 52 in which a foamable raw liquid is injected into a frame of a prescribed temperature and a stage 54 in which closed micro-cells formed by a polyurethane reaction are released by pressurizing the injected raw liquid by a compression press at a prescribed point of time when a polyurethane forming reaction advances. The compression ratio of the pressurization is set at 40-80%, and a pressurization speed is set at 0.5-2 mm/sec.