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Title:
FILTER SHEET FOR AIR FILTER, MANUFACTURE OF FILTER SHEET, AIR-PEREABLE SUPPORTING MATERIAL TO BE USED FOR SAME FILTER SHEET, AND AIR FILTER
Document Type and Number:
Japanese Patent JPH11253719
Kind Code:
A
Abstract:

To suppress unevenness of face wind velocity of an air filter even in the case of manufacturing a filter pack by a separator-less method and prevent a porous structure of a polytetrafluoroethylene porous membrane, which is a collecting layer, from being affected with heat.

Projections 3 are previously formed on the surface of a ventilative supporting material 6 of such as non-woven fabric and the resultant air- permeable supporting material 6 and a polytetrafluoroethylene porous membrane 5 are layered to give a filter sheet for an air filter. The projections 3 are utilized as a spacer at the time of manufacturing a filter pack to stabilize the intervals of bent parts of the obtained filter.


Inventors:
ISHINO TOSHIAKI
NAHATA NORIKANE
Application Number:
JP5838398A
Publication Date:
September 21, 1999
Filing Date:
March 10, 1998
Export Citation:
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Assignee:
NITTO DENKO CORP
International Classes:
B01D71/36; B01D39/00; B01D39/16; B01D46/52; (IPC1-7): B01D39/16; B01D39/00; B01D46/52; B01D71/36
Attorney, Agent or Firm:
Hiroyuki Ikeuchi (1 person outside)