| abstract |
The present invention provides an outer packaging material for a vacuum heat insulating material, which can suppress the occurrence of puncture caused by the needle-shaped short fiber powder even when the needle-shaped fiber powder is cut by cutting inorganic fibers such as glass wool. In the case of pinholes, even if it is used for a long time, the decrease in strength is small.nn n n The outer packaging body for a vacuum insulation material of the present invention is characterized in that it includes at least a base material layer and a sealant layer, and the base material layer has the following characteristics (a) to (c), Shaft-extended polybutylene terephthalate film.nn n n (a) Polyester resin other than polybutylene terephthalate resin (A) containing 60% to 90% by weight, and polybutylene terephthalate resin (A) containing 10% to 40% by weight (B).nn n n (b) The intrinsic viscosity of the film is 0.81 dl / g or more.nn n n (c) The puncture strength is 0.5 N / μm or more. |