Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1976-12-17
1978-11-14
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264209, 4251331, B29F 310
Patent
active
041255852
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: 3504402 (1970-04-01), Wetz et al.
patent: 3716612 (1973-02-01), Schrenk et al.
patent: 3924990 (1975-12-01), Schrenk
HPM Corporation
Thurlow Jeffery R.
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