CELLULOSE EXTRUSION

A process and apparatus used in cellulose extrusion is disclosed. In particular, the process discloses using an inert gas blanket above a cellulose solution wherein the inert gas blanket reduces any undesirable colour variations in the extruded product. Furthermore, the apparatus discloses draw mean...

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Bibliographische Detailangaben
Hauptverfasser:	BECKERS, STEFAN, D, WEIGEL, PETER, DOSZ, MICHAEL, FINK, HANS-PETER, PURZ, HANS-JOACHIM
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	A process and apparatus used in cellulose extrusion is disclosed. In particular, the process discloses using an inert gas blanket above a cellulose solution wherein the inert gas blanket reduces any undesirable colour variations in the extruded product. Furthermore, the apparatus discloses draw means positioned downstream of the extrusion means to continuously draw the extruded cellulose film from the extrusion means. Apparatus is also disclosed wherein a tubular member is used to receive an extruded blown tube. The product formed using the process and apparatus described herein which has a substantially uniform distribution of fine pores throughout its cross-section is also discussed. L'invention concerne un procédé et un appareil utilisé dans l'extrusion de la cellulose. Ce procédé concerne, en particulier, l'utilisation d'une couverture de gaz inerte se trouvant au-dessus d'une solution de cellulose, la couverture de gaz inerte réduisant les variations de couleur indésirables dans le produit extrudé. L'appareil comprend des moyens d'étirage placés en aval des moyens d'extrusion, afin d'étirer de manière continue le film de cellulose extrudé à partir desdits moyens d'extrusion. L'appareil comprend également un élément tubulaire utilisé pour recevoir un tube extrudé par soufflage. Le produit, formé au moyen du procédé et de l'appareil décrits ci-dessus, présente une répartition sensiblement uniforme de pores fins sur la totalité de sa section transversale.