公开(公告)号：US20220241708A1

公开(公告)日：2022-08-04

申请号：US17617409

申请日：2020-09-28

Applicant: HYDAC PROCESS TECHNOLOGY GMBH

Inventor： Bernhard SCHLICHTER ,  Martin WINTER

IPC: B01D39/10 ,  B01D39/08 ,  B01D39/16 ,  D03D13/00 ,  D03D15/67

Abstract: The invention relates to a method of producing a multilayer filter medium, comprising at least the production steps listed below: providing a woven fabric layer (12) having passage points (24) for fluid; providing a nonwoven layer consisting of a spunbonded nonwoven (18) and having additional passage points (28) for fluid; and joining the two superimposed layers (12, 18) along contact points (30) by melting the nonwoven layer (18) in such a way that while the additional passage points (28) enlarge, the molten spunbonded nonwoven material flows at least in part to the contact points (30) and then cumulatively curs there to produce firm connection points between the two layers (12,18).