MULTI-LAYER VACUUM HEAT INSULATING METHOD AND HEAT INSULATING DUPLEX TUBE

摘要

PURPOSE:To maintain vacuum heat insulating effect for long time and withstand the transport and storage of hot fluid by suppressing the generation of out gas by secular change as low as practicable. CONSTITUTION:A multi-layer Mylar material 5 which is interposed in a space 3 in an inner and outer duplex structure kept in vacuum is made of a stainless steel sheet at least one surface of which is bright-finished and, when it is sucked by vacuum, degassing is given by heating. Also a ceramic spacer 4 is interposed in the space 3 between inner and outer tubes.