Tubular materials

Details Tubular materials Tubular materials

1994-08-24

1997-09-09

Mackey, James P.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Stretching or stretch forming

2642902, 425393, B29C 5526

Patent

active

056652976

ABSTRACT:
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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patent: 4846645 (1989-07-01), Cole
patent: 4894198 (1990-01-01), Albrecht et al.
Whittington's Dictionary of Plastics, First Edition, 1968, p. 105.
"Biaxial Orientation" Encyclopedia of Polymer Science & Technology, vol. 2, W.R.R. Pad (The Dow Chemical Company) & J. Conrad (Gaylord Associates, Inc.) Interscience Publishers 1965, pp. 339-373.

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