Patent ID: 8181793
Filing Date: 2012-05-22
Classification: B01D,Y10S

Abstract:
1. A method for manufacturing a depth filter sheet material, said method comprising preparing a flowable aqueous pulp composition comprising a fibrous material and a binding agent; dispensing the flowable aqueous pulp composition onto a water permeable support in a predetermined amount per unit area; at least partially draining water content of the aqueous pulp composition through said water permeable support; subjecting said at least partially drained pulp composition to drying at an elevated temperature to form a depth filter sheet raw material comprising a first surface section and a second surface section forming an upper and a lower surface of the sheet raw material, respectively, and an intermediate section positioned in between and integrally formed with the first and the second surface sections, said intermediate section having a permeability greater than the permeability of the first and second surface sections; and removing or displacing at least portions of one of the first surface section or the second surface section of the raw material.