Method of and apparatus for shaping a strand during extrusion

Details Method of and apparatus for shaping a strand during extrusion Method of and apparatus for shaping a strand during extrusion

1981-05-06

1982-11-30

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Plural, intermittent pressure applying

264109, 264 407, 264176R, 2642102, 425132, 425325, 425327, 425381, 425461, 425466, B29J 510

Patent

active

043615309

ABSTRACT:
An extruder has a nozzle from which it extrudes a strand formed of a mixture of wood chips and a synthetic-resin binder into a passage formed by a plurality of transversely and longitudinally movable walls. Opposite walls are urged transversely inwardly by respective hydraulic cylinders to compact and densify the strand as it cures, and other cylinders urge the walls upstream toward the nozzle with a force slightly smaller than the extrusion force. Thus as the extrusion force exceeds the opposite longitudinal biasing force the walls will move downstream with the strand, to return upstream between advance steps of the strand.

REFERENCES:
patent: 1775735 (1930-09-01), Reker
patent: 2168889 (1939-08-01), Thomas
patent: 3092878 (1963-06-01), Conger
patent: 3518157 (1970-06-01), Terry et al.
patent: 3548452 (1970-12-01), Caleb
patent: 3551545 (1970-12-01), Overdiep
patent: 3914085 (1975-10-01), Kruelskie
patent: 3989433 (1976-11-01), Furman
patent: 4025262 (1977-05-01), Furman
patent: 4124347 (1978-11-01), Miller

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