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Patent Searching and Data


Title:
ELECTRET CAR FILTER ELEMENT
Document Type and Number:
Japanese Patent JPS59145013
Kind Code:
A
Abstract:

PURPOSE: To enhance dust removing efficiency without increasing pressure loss, by bringing a dry unwoven car filter element to an electret system.

CONSTITUTION: A synthetic fiber layer in which the mixing ratio of low m.p. polyester easily brought to an electret state is successively increased from the upstream layer side to the downstream layer side thereof or the unwoven fiber layer obtained by preliminarily applying mechanical bonding treatment to said fiber layer is heated to 150W180°C and, in this state, treatment is performed within a gap of 5mm at voltage of 10kV for about 5min. As the polyester fiber to be used, three kinds respectively having a high m.p. of 250W260°C, a medium m.p. of 200W230°C and a low m.p. of 150W180°C are used. In this case, an unwoven fabric obtained by a method wherein three kinds of card webs wherein a high m.p. one is gradually reduced while medium and low m.p. ones are increased from the upstream layer side to the downstream layer side are laminated and the formed laminate is subjected to needle punching processing and heat treatment at 150°C may preferably be used.


Inventors:
TAKIGAWA HISAYUKI
Application Number:
JP1906183A
Publication Date:
August 20, 1984
Filing Date:
February 07, 1983
Export Citation:
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Assignee:
KANAI HIROYUKI
International Classes:
B01D39/14; B01D39/16; B32B5/08; B32B5/26; (IPC1-7): B01D39/16; B32B5/08; B32B5/26