Manufacturing fiberboard ducts

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

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156 64, 156468, 156498, 226196, 229 16R, 493 52, 493 78, 493179, B31F 2310

Patent

active

044616643

ABSTRACT:
The apparatus forms fiberboard hollow ducts from fiberboard and comprises means for collapsing the fiberboard into a flat collapsed fiberboard means for advancing the collapsed fiberboard through a preheating and heating stage while heat sensitive tape is applied to the linear seam of the collapsed fiberboard. After tape is applied, means for applying pressure and cooling operate to permanently set the tape.

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patent: 4045263 (1977-08-01), Moore et al.
patent: 4070954 (1978-01-01), Cailey
patent: 4337113 (1982-06-01), Searle

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