Filter material, for liquids and gases, is of a strip drawn from a roll and folded in half along its longitudinal center line to give two layers for bonding together

摘要

The filter is formed from a strip drawn from a roll, folded in half along its longitudinal center line to give two layers. The two layers are bonded together by an adhesive, stitching, welding, soldering, etc. The filter material can be of paper, a nonwoven, knitted or nonwoven metal, and the like.