Method of making two ply duct core

Details Method of making two ply duct core Method of making two ply duct core

1979-10-17

1981-11-10

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156190, 156195, B65H 8100

Patent

active

042996414

ABSTRACT:
A first flexible strip is helically wound with adjacent edges of adjacent wraps in edge lapping relation, a forming or reinforcing element such as a wire is helically wound in overlying centered relation to lapping edges of the first strip and a second flexible strip is helically wound about the first strip covering and encasing the first strip and reinforcing wire, the second strip having adjacent edges of adjacent wraps in lapping relation symmetrically disposed in staggered relation to the lapping edges of the underlying first strip.

REFERENCES:
patent: 3107697 (1963-10-01), Daggett et al.
patent: 3400029 (1968-09-01), Mesrobian et al.
patent: 3428093 (1969-02-01), Guiles
patent: 3524779 (1970-08-01), Masters et al.
patent: 3554237 (1971-01-01), Pelley
patent: 3563826 (1971-02-01), O'Neal
patent: 3607517 (1971-09-01), Pelley
patent: 3846202 (1974-11-01), Clarke
patent: 3962019 (1976-06-01), Rejeski
patent: 4104097 (1978-08-01), Gregory et al.

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