Method for making a double wall fire proof duct

Details Method for making a double wall fire proof duct Method for making a double wall fire proof duct

1993-02-08

1995-01-24

Aftergut, Jeff H.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156169, 156173, B65H 8100

Patent

active

053839943

ABSTRACT:
A composite plastic duct structure comprised of an outer layer of fabric material impregnated with a fire-resistant resin material and an inner liner layer of chemically corrosion resistant resin material impregnated with a fabric material. The invention includes a method wherein multiple wrappings of resin impregnated material are wound on a mandrel to form the inner and outer layers.

REFERENCES:
patent: H219 (1987-02-01), Sayles
patent: 2467999 (1949-04-01), Stephens
patent: 2614058 (1952-10-01), Francis
patent: 3379591 (1968-04-01), Bradley
patent: 3728187 (1973-04-01), Martin
patent: 4107127 (1978-08-01), Shea

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