Triwall siding apparatus

Details Triwall siding apparatus Triwall siding apparatus

1988-10-05

1990-03-27

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

264 459, 264171, 4251335, 425462, 425817C, B29C 4706

Patent

active

049116282

ABSTRACT:
Highly uniform three-layer extrusions generally of flat siding or panels, preferably of PVC are extruded in an apparatus having a flow block in which lateral extruders supply the upper and lower layer streams to respective curved flow passages running to outlets of a flow block while a main extruder supplies the foam PVC to the central outlet. The outlets are aligned with orifices of a flow plate connected by respective channels to outlet orifices arranged within a common circle and communicating with a die. The outlet orifices include a pair of elongated kidney-shaped orifices encircling and straddling an ovoid central orifice.

REFERENCES:
patent: 3189941 (1965-06-01), Reifenhauser
patent: 3331900 (1967-07-01), Thomas
patent: 3411981 (1968-11-01), Thomas
patent: 3825644 (1974-07-01), Hoagland et al.
patent: 3833704 (1974-09-01), Nissel
patent: 3860372 (1975-01-01), Newman, Jr.
patent: 4107247 (1978-08-01), Dukess
patent: 4187270 (1980-02-01), Bartrum
patent: 4221624 (1980-09-01), Eslinger et al.
patent: 4405547 (1983-09-01), Koch et al.

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