Process for the extrusion of composite structural members

Details Process for the extrusion of composite structural members Process for the extrusion of composite structural members

1984-12-20

1987-02-24

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Treatment of material by vibrating, jarring, or agitating...

264113, 264120, 264122, 264126, 425325, 425408, B29C 4314

Patent

active

046456317

ABSTRACT:
Extrusion of a mixture of vegetable bits with a binder, particularly wood chips with a weather-resistant binder, involves precompressing in a compression chamber of an extrusion press the mixture by a compression stroke transverse to the extrusion axis, the compression stroke being delivered by at least one precompression piston. Prior to the precompression elongated bits of the mixture are acted on by an orienting influence so that the elongated bits are deposited substantially parallel to the extrusion axis. The outer layers of the mixture are compressed with a reduced precompression ratio so that the bits oriented prior to precompression remain fixed in position during the subsequent extrusion stroke. Preferably the elongated bits in the mixture are oriented by free fall of the mixture through a plurality of upright, thin-walled bars of approximately equal height positioned above the compression chamber during filling of the extrusion apparatus by a mechanical hopper moving to and fro over the bars continuously.

REFERENCES:
patent: 2256361 (1941-09-01), Straub
patent: 4107378 (1978-08-01), Bourguignon et al.
patent: 4263239 (1981-04-01), Dunbar et al.
patent: 4284595 (1981-08-01), Peters et al.
patent: 4358418 (1982-11-01), Heggenstaller
patent: 4432916 (1984-02-01), Logan
patent: 4505797 (1985-03-01), Richter

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