Regenerator material for extremely low temperatures, the heat shield material and refrigerator usin

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PROBLEM TO BE SOLVED : To reduce the pressure loss of refrigerant (operating medium) to develop refrigerating capacity sufficiently and permit the restraining of invasion of heat effectively by a method wherein the cavities of a porous bearer are filled with magnetic granular bodies, containing rare earth elements, in a cryogenic heat storage material employed for refrigerating machine and the like. SOLUTION : A sheet type cryogenic cold storage material 1 is provided with the structure of organization, in which the cavities of a porous bearer 2, made of Ni, are filled with a multitude of magnetic granular bodies (ErNi alloy powder). Respective magnetic granular bodies 4 are connected strongly to the porous bearer 2 through a connecting agent or polyvinyl alcohol. On the other hand, bumps, having the height of about 0.05mm, are formed on the surface of the cryogenic heat storage material 1 through rolling work employing an emboss working roll. The ends of obtained respective cryogenic cold storage materials 1 are connected by welding to make a continuous ribbon type cold heat storage material while the cold heat storage material is rolled to obtain a rolled cryogenic cold storage material 1. The roll type cryogenic cold storage material 1 is filled into the cold storage device 5 to effect cold storage.