Polymer flow stream redirecting and feeding device

Details Polymer flow stream redirecting and feeding device Polymer flow stream redirecting and feeding device

1983-04-13

1985-04-23

Czaja, Donald

Plastic article or earthenware shaping or treating: apparatus

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

425462, 425573, B29F 100

Patent

active

045127301

ABSTRACT:
A device for use with a runner block and a multi-polymer co-injection nozzle having separate rear entrance ports for separate polymer streams, in a multi-coinjection nozzle, multi-polymer injection molding machine, for receiving from the runner block a plurality of separate polymer flow streams and for redirecting them to flow axially out of the forward end of the device into the nozzle rear entrance ports. The device has inlets cut radially into its periphery, each for receiving a polymer flow stream, and has feed channels, each in communication with an inlet and having an inward portion cut toward the device's central axis, and an axial portion communicating with the inward portion, running axially forward and terminating at an exit hole in the device's forward end, the exit holes being in a spaced pattern for feeding the separate polymer flow streams in spaced relation into the nozzle rear entrance ports.
In preferred embodiments, the inlets communicate with feed throats, each cut radially into and running about a porton of the circumference of the device and having a terminal end portion which communicates with an axial feed channel, and a receiving chamber, desireably of stepped configuration, is cut axially into the forward end and adapted to receive a co-injection nozzle. Most of the exit holes are radially spaced from each other by an arc of 60.degree.. Isolation means, preferably including a plurality of annular grooves are cut into the periphery of the device between inlets and have an expandable piston ring seated therein to maintain the polymer flow streams isolated from one another.

REFERENCES:
patent: 3947172 (1976-03-01), Myers
patent: 3947173 (1976-03-01), Dougherty
patent: 4030637 (1977-06-01), Boden et al.
patent: 4315724 (1982-02-01), Taoka et al.
patent: 4405547 (1983-09-01), Koch et al.

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