Patent ID: 6432252
Filing Date: 2002-08-13
Classification: B32B,D06N,E04D

Abstract:
A method of manufacturing a bituminous coating sheet, wherein a bitumen-impregnated core material is provided with a layer of backface bitumen and wherein a slip material is applied on said backface bitumen in a slip material application station, said bitumen-impregnated core material with said backface bitumen and said slip material being further advanced in contact with one or more rotating bodies during manufacture, said slip material preventing said backface bitumen on said bitumen-impregnated core material from sticking to said rotating bodies during said further advancement, said method including the steps ofa) preparing a dispersion of said slip material in a liquid, b) applying said dispersion on said layer of backface bitumen on said bitumen-impregnated core material in said slip material application station, c) evaporating said liquid prior to said contact with said rotating bodies thereby cooling said backface bitumen and leaving said slip material on said backface bitumen, said bitumen-impregnated core material with said layer of backface bitumen having a temperature ranging between 100Â° C. and 200Â° C. when applying said dispersion and providing energy for evaporating said liquid, and d) applying a further bituminous layer on said slip material on said layer of backface bitumen following said slip material making contact with said rotating bodies.