Process for the continuous extrusion forming of a plastic double

Details Process for the continuous extrusion forming of a plastic double Process for the continuous extrusion forming of a plastic double

1979-04-04

1982-03-30

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

138125, 138126, 156149, 15624413, 15624422, 15624423, 15624424, 264 459, 264 461, 264 469, 2642091, B29D 2304

Patent

active

043222609

ABSTRACT:
The invention relates to a process for the continuous extrusion forming of a thermoplastic double-walled, foam-core conduit by the sequential steps of extrusion forming an inner plastic tube, evenly coating said inner tube with foam-core layer and extrusion forming and bonding an outer tube in contact with said foam-core layer, said outer tube being generally evenly spaced apart from said inner tube by said foam-core layer providing a plastic double-walled, foam-core conduit.

REFERENCES:
patent: 3118800 (1964-01-01), Snelling
patent: 3399095 (1968-08-01), Hyland
patent: 3547162 (1970-12-01), Schserer
patent: 3599677 (1971-08-01), O'Brien
patent: 3684602 (1972-08-01), Bell
patent: 4125585 (1978-11-01), Rosenbaum
patent: 4146562 (1979-03-01), Fukushima et al.
Plastic Technology, M. H. Naitove, "Now Co-Extrude Foam-Core ABS Pipe", 11/1978, pp. 50-52.

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