Coextrusion feedblock and process

Details Coextrusion feedblock and process Coextrusion feedblock and process

1978-09-25

1980-06-17

Thurlow, Jeffery R.

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

425146, 425462, B29D 2304

Patent

active

042081750

ABSTRACT:
A feedblock fashioned from a plurality of plates is disclosed which distributes two flows of dissimilar synthetic resinous materials into a radially stratified annular form for extrusion by a pipehead die. The feedblock is mounted on a pipehead with the plurality of plates defining material flow channels for three strata. Independently operable valves vary stratum thickness and assure radially matched flow conditions between strata at confluence. Each stratum is independently accelerated through a convergent channel to assure that a uniform circumferential distribution of flow conditions develops. Moreover, two strata are developed through channel systems which do not induce circumferential maldistribution. The third stratum is handled to eliminate circumferential maldistribution. Accordingly, the process and apparatus develop stable annular flow with radial stratification having neither radial nor circumferential maldistributions that may later interact to distort the strata.

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: 3447204 (1969-06-01), Lainson
patent: 3504402 (1970-04-01), Wetz et al.
patent: 3649143 (1972-03-01), Papesh et al.
patent: 3716612 (1973-02-01), Schrenk et al.
patent: 3737260 (1973-06-01), Kaye
patent: 3924990 (1975-12-01), Schrenk
patent: 3947173 (1976-03-01), Dougherty

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