Mandrel structure for use in manufacture of cellulose food casing

• Main Authors: MCGAREL, OWEN JOSEPH, LONG, LARRY CLYDE, JERANTOWSKI, RONALD JOSEPH, ALBERT, JAMES JOSEPH, WILLIAMS, MARK GRIFFITH
• Format: Patent
• Language: English; French; German
• Published: 23.11.2005
• Edition: 7
• Subjects: 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; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; 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

A mandrel 26 over which a tube 16 of non derivatized cellulose is extruded depends from the extrusion orifice 15. The mandrel 26 has a shaft portion 28 and a sizing portion 30 which is of greater diameter than the orifice 15 and serves to "size" the extruded cellulose tube. The sizing portion 30 has a plurality of orifices 60 which form a diamond pattern on the outer surface of the sizing portion 30. The orifices allow gas bubbles which are evolved during extrusion to pass to the interior of the mandrel 26 to be vented through a conduit (54 in figure 2). An upper band (59 in figure 2) of the sizing portion 30 has no orifices and forms a seal between the tube 16 and the sizing portion 30 to prevent passage of gas therebetween.