Diesel particulate trap of perforated tubes having laterally offset cross-wound wraps of inorganic yarn

US5248481A · kind A · utility

Assignee

• Minnesota Mining and Manufacturing Company · US

Inventors

• Richard L. Bloom · Woodville, US
• Troy K. Ista · River Falls, US
• Mark Smith · Coon Rapids, US

Key dates

• Filing date: May 11, 1992
• Grant date: Sep 28, 1993
• Expiry date: May 11, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S55/10
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An efficient, economical, compact diesel particulate trap has a plurality of perforated hollow tubes, on each of which a heat-resistant yarn is helically cross-wound to provide a plurality of layers that function as a filtering element. The yarn, which preferably is a continuous-filament ceramic yarn, has a core from which filaments or fiber segments project outwardly and intermesh with fiber segments of laterally spaced cores to provide traps. The cores of yarn convolutions of at least one layer are laterally offset from the cores of convolutions of an adjacent layer to deflect into tortuous paths gases flowing generally radially through the filtering element.