Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1990-08-16
1992-01-07
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
2642098, 4251331, 425462, B29C 4706, B29C 4720
Patent
active
050789422
ABSTRACT:
The present invention is an improved method and apparatus for the coextrusion of layered wall conduit wherein a flow of a first resin is advanced along a longitudinal axis and two flows of a second resin is advanced along paths that straddle the flow of first resin. The advancing flows of second resin are progressively spread into arcuate fanned shapes that extend about the flow of first resin until the edges of the fanned flows meet to form a first axially extending annular flow surrounding the flow of first resin. The flow of first resin is then shaped into a second axially extending annular flow that is inwardly concentric relative to the first annular flow and the first and second annular flows are moved into confluence to form a layered flow that is shaped in a sizing due into layered wall conduit. In one embodiment, a third outwardly concentric annular flow is moved into confluence with the layered flow forming a three-layer flow for shaping into conduit.
REFERENCES:
patent: 3099860 (1963-08-01), Schippers
patent: 3223761 (1965-12-01), Raley
patent: 3266093 (1966-08-01), Corbett
patent: 3419938 (1969-01-01), Sonia et al.
patent: 3504402 (1970-04-01), Wetz et al.
patent: 3716612 (1973-02-01), Schrenk et al.
patent: 3924990 (1975-12-01), Schrenk
patent: 4125585 (1978-11-01), Rosenbaum
patent: 4362488 (1982-12-01), Casals et al.
patent: 4731002 (1988-03-01), Spence et al.
patent: 4783299 (1988-11-01), Prevotat
Ivy Frank B.
Sullivan Dayrel E.
Griffco Plastics, Inc.
Tentoni Leo B.
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