Patent ID: 9630148
Date: 2017-04-25
CPC Classifications: B01D,Y10T

Claim:
1. A liquid-filtration composite material comprising five layers, including (i) a drainage fabric having a top and a bottom side and (ii) first and second filtration membranes laminated to the top and bottom sides of the drainage fabric, wherein the lamination between the drainage fabric and the filtration membranes has a dynamic pressure stability above 0.15 bar, wherein the drainage fabric and the filtration membranes are laminated to each other by two flat adhesive nets disposed on opposing sides of the drainage fabric, said nets extending down the drainage fabric length and across the drainage fabric width within the composite material interior, the adhesive nets have a basis weight in the range from 20 to 80 g·m the filtration membranes are formed from a support nonwoven and a porous membrane layer.