Accumulator extrusion head for producing striped parisons

Details Accumulator extrusion head for producing striped parisons Accumulator extrusion head for producing striped parisons

1988-11-03

1989-10-17

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

264173, 2642098, 4253761, 425381, 425462, 425466, B29C 4754

Patent

active

048743054

ABSTRACT:
An accumulator extrusion head assembly for producing a parison having at least one stripe extending longitudinally thereof comprises an extrusion head body member having an opening extending inwardly from a nozzle outlet end and a mandrel positioned in the body member to define a generally annular extrusion chamber terminating in an annular outlet nozzle. An annular ram is mounted in the extrusion chamber and has a forward end positioned for reciprocation toward and away from the outlet nozzle. A first supply extruder is connected to the body member through first passages for supplying a first extrusion material to the annular extrusion chamber. A second supply extruder is also connected to the body member through second passages for supplying a second extrusion material to the annular extrusion chamber. The second passages include a supply outlet in the forward end of the ram for providing a radially continuous stripe of the second extrusion material to the annular extrusion chamber and, a connecting passage for maintaining a flow connection between the second extruder and the supply outlet during reciprocation of the ram.

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