EVACUATED JACKET FOR THERMAL INSULATION AND PROCESS FOR MANUFACTURING THE SAME

摘要

An evacuated jacket for thermal insulation comprises a discontinuous or porous, organic or inorganic filling material arranged inside an envelope ma de with at least one multi-layer barrier sheet (1) of substantially rectangular shape, which comprises at least one polymeric or inorganic central layer (2) having barrier properties towards atmospheric gases, an upper layer (4) and a lower layer (3), both of a polymeric material. The polymeric material which forms said upper layer (4) and the polymeric material which forms said lower layer (3) of the barrier sheet (1) are mutually heat-sealable and said barri er sheet (1) is folded up so as to superimpose two opposite sides (5, 6) thereo f which are welded to each other by melting said upper layer (4) at one margin (6) and said lower layer (3) at the other margin (5). The present invention also relates to a process for manufacturing said evacuated jacket for therma l insulation.