| 摘要 |
A microporous paper filter ( 10 ) for particulates emitted together with the exhaust gases of internal combustion engines, made in the form of a folded up sheet to form a "Greek key" i.e. having several filtering layers ( 13 ) placed substantially parallel, connected by means of folds ( 14 ), the layers ( 13 ) being separated and maintained equidistant through the interposition of spacers ( 20 ) each comprising at least one corrugated paper sheet ( 21, 22 ) or pleated paper ( 23 ).
|
