| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel vacuum insulation material which improves workability in manufacturing and is capable of suppressing infiltration of external gas even when fracture or damage is incurred by erroneous handling.SOLUTION: An additional thermal welding part is provided around a corner part where two sides of a jacket material are overlapped and folded, and a non-welded part which has not been welded, is formed in a folded portion between the additional thermal welding parts. A folded corner part where folded parts of adjacent two sides are overlapped is formed within the additional thermal welding part. Therefore, even when a corner part of a vacuum insulation material is fractured and damaged to be bored, since the additional thermal welding part is present around the bore, infiltration of external gas into the vacuum insulation material can be suppressed. In a folded portion of the vacuum insulation material, a clearance between the additional thermal welding parts is the non-welded part, such that folding is facilitated and productivity can be improved. |
