Cellulose food casing manufacturing method

Details Cellulose food casing manufacturing method Cellulose food casing manufacturing method

A - Human Necessities

22

C

18/786

A22C 13/00 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2223185

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.

Cette invention concerne l'extrusion d'un produit tubulaire, à partir d'une solution de cellulose non dérivatisée thermoplastique, autour d'un mandrin extensible à partir de la filière d'extrusion et au travers d'un entrefer long de plus de 304 mm. En début d'extrusion, le mandrin sort de la filière sur une petite distance. En marche stabilisée, le mandrin sort complètement de la filière. L'invention concerne également un mandrin étudié pour faciliter l'introduction d'un liquide non solvant dans le tube extrudé, en positon haute en début d'extrusion et en position plus basse en cours de fonctionnement stabilisé.

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