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1. (WO1998051424) SPIRAL-FORMED EXHAUST TUBE

Pub. No.:    WO/1998/051424    International Application No.:    PCT/US1998/009858
Publication Date: Fri Nov 20 00:59:59 CET 1998 International Filing Date: Fri May 15 01:59:59 CEST 1998
IPC: B21C 37/12
Applicants: ARVIN INDUSTRIES, INC.
LEBEAU, Phillip, E.
TURNBOW, Rondal, Wayne
HOLT, Tommie, A.
Inventors: LEBEAU, Phillip, E.
TURNBOW, Rondal, Wayne
HOLT, Tommie, A.
Title: SPIRAL-FORMED EXHAUST TUBE
Abstract:
A method is provided for producing a spiral-formed exhaust tube (12). Material (14) having spaced-apart first and second edges (50, 52) and a die (86) having a groove (96) are provided. Louvers (32) are formed in the material (14). The material (14) is rolled into a tube using the die (86) so that the louvers (32) extend outwardly away from a longitudinal axis (84) of the tube (12). The louvers (32) pass through the groove (96) of the die (86) as the material (14) is rolled into the tube (12). The first and second edges (50, 52) of the material (14) are then connected.