Heat-insulating units for refrigerator cabinets

Claim 1

IN COMBINATION, A DEFORMABLE POROUS MASS OF SOLID POOR HEAT-CONDUCTING MATERIAL, AN HERMETICALLY SEALED BAG ENCLOSING SAID MATERIAL, AND A CHARGE OF A GAS HAVING A COEFFICIENT OF THERMAL CONDUCTIVITY LOWER THAN THAT OF AIR ALSO ENCLOSED IN SAID BAG AND THOROUGHLY PERMEATING SAID POROUS MASS OF SOLID POOR HEAT-CONDUCTING MATERIAL, THE WALLS OF SAID BAG BEING SUBSTANTIALLY IMPERVIOUS TO SAID GAS CONFINED THEREIN AND ALSO TO ATMOSPHERIC GASES AND TO WATER VAPOR AND BEING FORMED OF A FLEXIBLE MULTI-PLY LAMINATE, SAID LAMINATE INCLUDING AN INTERMEDIATE PLY OF CALENDERED KRAFT PAPER HAVING A THICKNESS OF ABOUT 5 MILS TO PROVIDE A HIGH TEAR STRENGTH AND AN INNER PLY OF VINYLIDENE CHLORIDE COPOLYMER RESIN HAVING A THICKNESS OF AT LEAST ABOUT 1 MIL TO PROVIDE A LOW PERMEABILITY TO SAID GAS AND TO ATMOSPHERIC GASES AND TO WATER VAPOR AND AN OUTER PLY OF POLYETHYLENE RESIN HAVING A THICKNESS OF ABOUT 2 MILS TO PROVIDE A HIGH ABRASION RESISTANCE, SAID INTERMEDIATE PLY BEING RESPECTIVELY ADHERED TO SAID INNER PLY AND TO SAID OUTER PLY BY INNER AND OUTER ADHESIVE LAYERS, EACH OF SAID ADHESIVE LAYERS BEING FLEXIBLE AFTER SETTING THEREOF AND HAVING A LOW PERMEABILITY TO SAID GAS AND TO ATMOSPHERIC GASES AND TO WATER VAPOR.