| 摘要 |
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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