Filtering medium for air filters and process for producing the s

Details Filtering medium for air filters and process for producing the s Filtering medium for air filters and process for producing the s

1999-05-21

2000-11-21

Spitzer, Robert H.

Gas separation

With means securing or retaining separating media

Unit or cohesive sheet-like media in flow line or frame

55521, 55528, 55DIG5, B01D 2907, B01D 4610

Patent

active

061497029

ABSTRACT:
A filtering medium for air filters wherein its surface conditions have been improved, whereby the porous PTFE membrane is not damaged even after pleating, thus appropriately meeting needs for clean space in clean rooms. The filtering medium comprises a porous polytetrafluoroethylene membrane (2) and an air-permeable supporting member (1) which are laminated such that at least one of exposed surfaces comprises a surface of the air-permeable supporting member (1) having a maximum frictional resistance of 25 gf or less. This filtering medium can be obtained by, for example, press bonding the air-permeable supporting member (1) to the porous membrane (2) under heating and then pressing the surface of the air-permeable supporting member (1) to a silicone roll (4) for smoothing.

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