Solid phase deformation of thermoplastic tubes
US4801419A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1986 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Jul 15, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2027/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the deformation of a hollow workpiece comprising orientable, thermoplastic polymer by passage in the solid phase through a die having both an entry side and an exit side, which process comprises providing the hollow workpiece at the entry side of the die; applying to the hollow workpiece from the exit side of the die a tension insufficient to cause tensile failure of the workpiece but sufficient to deform the hollow workpiece by drawing it with reduction in its bulk cross-sectional area in the solid phase simultaneously through the die and over an internally positioned former having a cross-sectional area greater than the initial internal cross-sectional area of the hollow workpiece; and collecting the deformed hollow workpiece from the exit side of the die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.