Pre-form for exhaust aftertreatment control filter
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United States of America Patent
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-
Jun 24, 2003
Grant Date -
Nov 7, 2002
app pub date -
Aug 23, 2001
filing date -
May 18, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A green uncured pre-form (10) for an exhaust aftertreatment filter includes first and second sheets (12 and 14) of regenerable filter material, the second sheet being pleated and forming with the first sheet a plurality of axially extending flow channels (32, 80, 81) having lateral cross-sectional shapes with two adjacent included angles (34 and 36, 56 and 58) each greater than 45.degree. and less than 75.degree. and having wall segments (18 and 20, 68 and 70) with a thickness less than 0.8 mm, a porosity greater than 80%, and an extension height (b) between pleat tips less than 10 mm. Forming apparatus (83, 84) and methods are provided.
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