Method for the manufacture of thin tubes of fluorinated resin, particularly of polytetrafluoroethylene
US5207960A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1991 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | May 29, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/055
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the manufacture of a thin-walled tube of fluorinated resin, particularly polytetrafluoroethylene, in which a ribbon of fluorinated resin obtained by lubricated extrusion and calendaring, is wound into a tube on a mandrel, the winding of the ribbon being performed in a plurality of layers, and the thus-wound ribbon on the mandrel being brought to a temperature above the sintering temperature of the fluorinated resin for sufficient time to produce sintering. The wound tube and the mandrel are cooled; while on the mandrel the thin-walled tube is rolled to elongate the tube, to reduce the thickness of the tube, and to increase the inside diameter of the tube; and then the mandrel within the tube is extracted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.