CORE MATERIAL FOR VACUUM INSULATION MATERIAL, VACUUM INSULATION MATERIAL, AND PROCESSES FOR PRODUCING THESE

摘要

A core material for vacuum insulation materials which is capable of attaining an improvement in heat-insulating performance exceeding a conventional improvement limit and has excellent heat-insulating performance; a vacuum insulation material employing the core material; and processes for producing these. The core material for vacuum insulation materials (100) is a core material for vacuum insulation materials which has been obtained by superposing nonwoven fabrics (110). Each nonwoven fabric (110) comprises glass fibers (111 and 112) produced by the continuous filament method. In each nonwoven fabric (110), most (111 and 112) of the glass fibers (111 and 112) extend in directions almost parallel to the surfaces of the nonwoven fabric (110).