Method of making double layer sheet metal panels with ducts formed by inflation.

摘要

@ A method of making sheet metal panels (1) from two layers between which ducts (2) are formed by inflation, in which the inflation is effected by the use of a predetermined quantity of Freon in the liquid state, the subsequent evacuation of the Freon from the ducts being effected by evaporation, preferably using a compressor-condenser unit (21).