VACUUM HEAT INSULATING MATERIAL, AND HEAT INSULATING BOX AND REFRIGERATOR USING THE SAME

摘要

PROBLEM TO BE SOLVED: To suppress reduction of heat insulating performance and the occurrence of poor leakage by improving slidability for an outer coating material of a core material so as to alleviate stress concentration on a bend portion of the outer coating material and minimize shrinkage of the outer coating material and the occurrence of wrinkles in the bend portion when a vacuum heat insulating material is bent.SOLUTION: The vacuum heat insulating material includes a core material of a plurality of laminated bodies containing a fiber of long fiber web, and an outer coating member having gas barrier property. The core material is composed of the plurality of laminated bodies each having a fiber containing at least a resin fiber of a different friction coefficient for each laminated body. By changing a condition of the surface of the resin fiber, a friction coefficient of the core material and the innermost layer of the outer coating material contacted with the core material is provided to be smaller than a friction coefficient of core materials having different friction coefficients. Accordingly, the stress applied on the bend portion is alleviated when the vacuum heat insulating material is bent. The core material different in friction coefficient for each laminated body a plurality of laminated bodies formed by melt spinning of a melt-blown method using resin or a spun-bonding method.