초록 ▼

In a double walled cryogenic storage container provided with a vacuum space, a composite multi-layer insulation in said space comprising thin radiation layers separated by permanently precompressed sheets weighing less than 2 gms/ft.2 composed of selected organic fibers of at least 1 micron diameter

In a double walled cryogenic storage container provided with a vacuum space, a composite multi-layer insulation in said space comprising thin radiation layers separated by permanently precompressed sheets weighing less than 2 gms/ft.2 composed of selected organic fibers of at least 1 micron diameter bonded together and having a water regain value less than 1%; and activated carbon adsorbent.

대표청구항 ▼

A container for storing materials at low temperatures comprising an inner vessel for holding such material; a larger outer gas-tight casing having rigid self-supporting walls around said inner vessel of such size to form an intervening evacuated load-free space at an absolute pressure less than abou

A container for storing materials at low temperatures comprising an inner vessel for holding such material; a larger outer gas-tight casing having rigid self-supporting walls around said inner vessel of such size to form an intervening evacuated load-free space at an absolute pressure less than about 0.5 micron mercury, said space containing multi-layered thermal insulation comprising thin flexible sheet radiation barriers supported by and in alternating relation with low conductive organic fibrous sheet layers in the permanently precompacted form having a water regain value of less than 1% by weight, weighing less than 2 grams/ft.2 and being comprised of fibers having an intrinsic thermal conductivity of less than 0.2 Btu/hr.ft.° F. and an effective diameter of at least 1 micron, said fibers being arranged in random overlaying crossing relationship in planes parallel to the sheet surface with at least some of the cross points between fibers bonded together, said fibers being selected from the group consisting of polyolefins, polyesters, poly(vinyl chloride), poly(vinylidene chloride) and copolymers of acrylonitrile and vinyl chloride; and activated carbon adsorbent material in contiguous relationship with the outer surface of said inner vessel, said carbon adsorbent having water adsorptivity of less than 2% by weight.