Patent ID: 6017583
Filing Date: 2000-01-25
Classification: D21F

Abstract:
Process for the manufacture of a permeable strip material (1), in which, on at least one side of a support (2) a plastic layer (5, 6) is produced from a mixture of plastic material and particulate soluble corpuscles, wherein the soluble corpuscles are leachable by a solvent to which the plastic material is stable and that thereafter the soluble corpuscles are leached out from the plastic layer (5, 6) at least in part, with the formation of throughflow passages from one side to the other of the plastic layer sufficient to permit dewatering to occur, characterized in that the plastic material is prepared in the form of a plastic powder which is mixed with the soluble corpuscles and applied onto the support (2) and that by heat and pressure treatment sufficient to form a planar outer surface plastic layer (5, 6) is formed from the mixture of plastic powder and soluble corpuscles with the soluble corpuscles being contained therein, prior to the soluble corpuscles at least in part being leached out of the plastic layer (5, 6).