METHOD FOR IMPREGNATING A POROUS FIBROUS SUBSTRATE WITH A POWDERY MATERIAL AND FIBROUS SUBSTRATE THUS PRODUCED

摘要

The invention relates to a method for impregnating a porous fibrous substrate (4) with a powdery material (12), according to which the powdery material (12) is brought into contact with said substrate (4), then moved in relation to said substrate in order to make it penetrate into said substrate, characterised in that prior to the deposition of the powdery material, the substrate (4) is exposed to a heat source (6) with conditions of intensity and exposure time that generate a partial swelling of the thickness thereof.