Mandrel structure for use in manufacture of cellulose food casin

Details Mandrel structure for use in manufacture of cellulose food casin Mandrel structure for use in manufacture of cellulose food casin

1997-03-27

1998-06-02

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264102, 264187, 264203, 2642095, 26421111, 264561, 264562, 264563, 425 71, 425380, 425467, B29C 4700, B29C 4720, B29C 5528

Patent

active

057594783

ABSTRACT:
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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