Modular tubular extrusion head and a process for extruding tubul

Details Modular tubular extrusion head and a process for extruding tubul Modular tubular extrusion head and a process for extruding tubul

1991-11-25

1995-02-28

Nguyen, Khanh

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

425192R, 425462, 264173, B29C 4706, B29C 4712

Patent

active

053932161

ABSTRACT:
A polymer resin extrusion head includes one or more annular extrusion modules in which a spiral channel having one or more convolutions extends from a resin inlet on the periphery of the module to an annular extrusion outlet. Preferably, the channel gradually opens into an annular frustoconical space leading to the extreusion outlet at the inner edge of the module. The spiral channel extends symmetrically around the extrusion module or modules in a manner so as to subject all of the extruded polymer flowing from the inlet to the extrusion outlet to substantially the same process conditions along the flow path. As a result, the polymer is distributed at the outlet with properties which are substantially symmetrical around the axis of the extrusion module or modules for all resin distributed to the outlet. It is preferable that the extrusion module or modules include a pair of mating annular members with central frustoconical portions having apexes with an axial dimension greater than the axial dimension of the outer portions of the modules so as to form air spaces around each module including frustoconical air space portions to avoid direct heat transfer between adjacent modules.

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Modern Plastics, Mid-October, 1991, pp. 222-224.

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