Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1995-06-07
1999-06-08
Dye, Rena L.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428 3692, 428220, 428910, 138118, 138DIG7, B29D 2200
Patent
active
059103469
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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Craggs Gordon
Selwood Alan
Taraiya Ajay Kumar
Ward Ian MacMillan
BTG International Limited
Dye Rena L.
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