发明名称 |
Mandrel structure for use in manufacture of cellulose food casing |
摘要 |
The tubular extrusion of a thermoplastic nonderivatized cellulose solution about a mandrel and through a long air gap in excess of 304 mm is facilitated by use of a mandrel which is extensible from the extrusion die. On extrusion start-up, the mandrel extends a short length from the die. For steady-state operation, the mandrel is extended its full length from the die. Also disclosed is a mandrel structure to facilitate the introduction of a nonsolvent liquid into the interior of the extruded tube at a high location on start-up of extrusion and at a lower location during steady-state operation. The mandrel also includes a sizing portion having circumferential grooves which gather gas bubbles that may evolve at the interface between the extruded tube and the sizing portion. Vertical channels in the sizing portion connect these grooves and provide the passage of gas bubbles into a volume below the mandrel.
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申请公布号 |
US5759478(A) |
申请公布日期 |
1998.06.02 |
申请号 |
US19970827152 |
申请日期 |
1997.03.27 |
申请人 |
VISKASE CORPORATION |
发明人 |
KAJIWARA, EDWARD MAKOTO;LOICHINGER, BRANT ANTON |
分类号 |
B29C47/00;B29C47/20;B29C47/88;B29C47/90;B29K1/00;B29L23/00;(IPC1-7):B29C47/00;B29C55/28 |
主分类号 |
B29C47/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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