Title: Apparatus involving a centerplate and a heat sink between multiple flat extrusion streams

Abstract: A dual outlet extrusion flat film die assembly for various thermo-extrudable materials includes split manifold chambers separated from each other by a rigid centerplate. Each portion of the die in the direction behind the flow materials includes a heat sink slot behind the manifold. Each manifold tapers toward its own die mouth; has separate melt inlets adapted for center, top or end feed operations; has separate pre-land and final land surfaces leading to individual outlet openings for precise control of melt flow; and has separate heat control means allowing precise temperature control for each melt as it flows throughout the die. Temperature differentials ranging from O.degree. to 200.degree.F. are obtainable between the extruded layers. A differential push-pull adjustment system for each movable lip of each outlet opening includes opposed alternatingly staggered thimble bolts to precise control of each individual layer profile.

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Inventors: Marion, George J. (West Chester, PA, US)

Application Number: 435490
Filing Date: 1974-01-22
Publication_date: 1976-03-02
Assignee:
Primary Class(es): 425/463 425/379.1, 425/466
Other Classes:
US Patent Ref:

2718661	Sep, 1955	Russell	425/466.
3382537	May, 1968	Tigher	425/463.
3462332	Aug, 1969	Goto	156/500.
3516886	Jun, 1970	Quackenbush et al.	156/244.
3640659	Feb, 1972	Dimitrov	156/500.
3829274	Aug, 1974	Melead	425/466.

Other Refs:
Primary Examiner: Shore, Ronald J.
Assistant Examiner: Rosenbaum, Mark
Attorney: Jackson, Jackson & Chovanes