To provide a new vacuum insulation material which prevents a gas from intruding and the degree of internal vacuum from decreasing by heat-sealing the non-heat-sealing portions including a bent part, a folded part and a corner part of a film with a gas barrier property which occur around corners of a core material as well as the non-heat-sealing portions of a peripheral part near the core material side along the quadrilateral of the core material of the vacuum insulation material even if there occur small holes or cracks at a tip of the corner part on the film when folding, considering such problems that when a conventional vacuum insulation material is used by folding its limb part toward the core material side, holes and cracks occur at bent portions through which the gas is easy to intrude, and also to provide a method of manufacturing the vacuum insulation material.
The core material 2 is housed in a bag body F composed of a gas barrier film 3 which has a heat-sealing layer. By heating under a normal pressure, the whole or non-heat-sealing portions of the vacuum insulation material which are internally sealed in a decompression state, the non-heat-sealing portions M of the bag body F are heat-sealed.
SATO HIDETO
KONDO TOMOYUKI
| JP2004239300A | 2004-08-26 | |||
| JP2004197935A | 2004-07-15 | |||
| JPH09286089A | 1997-11-04 | |||
| JP2004011861A | 2004-01-15 | |||
| JPH08303686A | 1996-11-22 | |||
| JP2005016629A | 2005-01-20 |
Yoshikuni Koizumi