| 摘要 |
PROBLEM TO BE SOLVED: To provide a filling method of a foamed heat insulating material for preventing the occurrence of the so-called unfilling or a void by diffusing the foamed heat insulating material in a heat insulating casing. SOLUTION: This foamed heat insulating material composed of hard urethane foam is injected into the heat insulating casing composed of an outer box 3 and an inner box 4 via a mixer 10 from a foaming machine 9; a directional control valve arranged in the mixer 10 is switched in a state of an undiluted solution for generating fine foam; high pressure dry nitrogen gas supplied from a third tube 14 is injected and diffused into the heat insulating casing from a nozzle 11; and the foamed heat insulating material is spread up to all the corners in the heat insulating casing. COPYRIGHT: (C)2005,JPO&NCIPI
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