Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means
Patent
1991-12-20
1993-08-31
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
Extrusion shaping means
425462, 425467, B29C 4720
Patent
active
052403963
ABSTRACT:
A co-extrusion head includes a melt housing with bushing housing connected thereto by an intermediate spider. A first resin is injected into the housing through an inlet portion central to a symmetrical annular channel extending through the melt housing for discharge of the first melt at an annular port. Concurrently, a second resin is injected into the housing through a generally straight bore extending between an inlet and outlet port centrally located within the confines of the first annular port. The first resin follows a geometrically balanced flow path from inlet to outlet. The first and second resin flows are directed to a bushing housing by an intermediate spider. Within the bushing housing bore is a pin for forming an external annular channel for the first resin and an internal bore for the second resin. The pin directs the first and second resin flows to a melt juncture so as to meld a core of second resin melt with a surrounding first resin melt. The multi-layer tubular core is then directed downstream for further processing.
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Chase D. A. N.
Chiesa Richard L.
Yakimo, Jr. Michael
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