Extrusion apparatus and method

Details Extrusion apparatus and method Extrusion apparatus and method

1986-04-03

1988-06-28

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264567, 425141, 425 721, 4253261, 4253871, B29C 4788, B29C 4792

Patent

active

047537671

ABSTRACT:
Extrusion apparatus for producing a continuous molten tube of a film-forming material includes an extrusion die defining an annular extrusion orifice between adjustable die lips through which a heat-plastified, synthetic, resinous, extrudable film-forming material is extruded in a radial direction. An annular gas bearing in spaced relationship to the orifice redirects the film into a tubular shape. In one die arrangement extrusion takes place radially outward, whereas in a second die arrangement extrusion takes place radially inward.

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