Method and apparatus of manufacturing resin tubes...

Details Method and apparatus of manufacturing resin tubes... Method and apparatus of manufacturing resin tubes...

B - Operations, Transporting

29

C

18/750

B29C 47/34 (2006.01) B29C 47/00 (2006.01) B29C 47/22 (2006.01)

Patent

CA 1056121

ABSTRACT OF THE DISCLOSURE Resin tubes having thick walled portions and thin walled portions are formed by providing a specially configured orifice on an extruder and varying the rate at which the extruded resin tube is pulled from the extruder. The orifice is shaped to form a thin tubular opening and a thick tubular opening communicating with one another, the thick tubular opening being adjacent and down-stream of the thin opening. When the extruded resin tube is pulled at a high speed the thin tubular opening is filled with resin that passes through but does not fill the thick tubular opening. At the slow pulling speed the resin fills at least open end portion of the thick tubular opening thereby forming a thick walled portion of the resin tube.

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