Tubular materials

Details Tubular materials Tubular materials

B - Operations, Transporting

29

C

18/935

B29C 55/26 (2006.01) B29C 55/30 (2006.01)

Patent

CA 2004103

Tubular workpieces of oriented polymers such as polyethylene polyester and PVC are formed by drawing a workpiece over an expanding former in the absence of any force perpendicular to the axis of the workpiece. The processes do not require the use of any liquid lubricant. They enable greater degrees of expansion and hence orientation in the direction perpendicular to the axis to be achieved and result in products of improved appearance and strength.

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