Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means
Patent
1978-08-21
1980-06-10
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
Extrusion shaping means
425376B, 425380, 425462, B29F 310
Patent
active
042070457
ABSTRACT:
One or several strands of a material in plastic state are laid in pressure-free fashion into an exposed exteriorly accessible circular inlet channel of an extrusion die, while at least the diepart or dieparts, which define the inlet orifice are rotated so as to distribute each strand generally helically in the channel, and a driving shear force is applied against the material in the inlet channel to advance the material towards the die orifice, from where it is extruded in form of a tubular film or a circular array of filamentituous elements. The driving shear force can be established by rollers or scrapers engaging with the inlet orifice, or by moving the two sides of the inlet orifice relative to each other preferably in connection with an internal vanes adapted to produce a pumping action, or by an inserted ring in the orifice.
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patent: 3416982 (1968-12-01), Petzetakes
patent: 3558755 (1971-01-01), Laban et al.
patent: 3642396 (1972-02-01), Meneidis
patent: 3778333 (1973-12-01), Rasmussen
patent: 3801429 (1974-04-01), Schrenk et al.
patent: 3865526 (1975-02-01), Drostholm et al.
patent: 3894901 (1975-07-01), Breher
patent: 3938929 (1976-02-01), Strat et al.
patent: 4060361 (1977-11-01), Ziolko
Daniel William J.
Woo Jay H.
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