System for producing tubes

Details System for producing tubes System for producing tubes

B - Operations, Transporting

29

C

18/758

B29C 59/00 (2006.01) B29C 47/00 (2006.01) B29C 47/20 (2006.01) B29C 47/34 (2006.01) B29C 47/90 (2006.01) B29C 55/26 (2006.01) B29C 69/00 (2006.01)

Patent

CA 1285360

ABSTRACT A process and apparatus for preparing seamless, creaseless, pliable, thin-walled tubes involves extruding a continuous moving tube of polymeric film material from a die into the ambient atmosphere. The tube is radially stretched over a sizing disk as the polymeric film material emerges from the die. A pillow of pressurizing air is maintained within the tube in the region between the die and the sizing disk. The tube is longitudinally stretched. The downstream free end of the tube is maintained open to the ambient atmosphere and free of creases. The tube is severed while maintaining the cross-sectional shape of the tube free of creases and while the tube is in motion. The result is at least one tube segment having a right cylinder configuration substantially free of creases.

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