Apparatus for throttle-valving control for the co-extrusion of p

Details Apparatus for throttle-valving control for the co-extrusion of p Apparatus for throttle-valving control for the co-extrusion of p

1996-09-27

1999-06-22

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

4251331, B29C 4516

Patent

active

059141387

ABSTRACT:
A multiple-plastic stream co-extruder as for injection-molding cavities, in which the extruder is internally provided therewithin and therealong with a restrictor or throttle pin, rod or element that forces combined plastic material streams, formed with an interior core stream encased in outer and inner stream layers, into corresponding concentric annular flow stream layers that are ultimately split transversely in opposite directions into a cavity gated to the extruder, and with the core stream at a region of zero gradient in the transverse flow velocity profile within the extruder and cavity.

REFERENCES:
patent: 3894823 (1975-07-01), Hanning
patent: 5028226 (1991-07-01), De'ath et al.
patent: 5131830 (1992-07-01), Orimoto et al.
patent: 5143681 (1992-09-01), Daubenbuchel et al.
patent: 5156857 (1992-10-01), Wang et al.

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