Production of string-like polytetrafluoroethylene
US4496507A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1982 |
| Grant date | Jan 29, 1985 |
| Priority date | — |
| Expiry date | Jul 2, 2002 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01D5/24
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for producing a tube or rod of a polytetrafluoroethylene is described. The process comprises molding a polytetrafluoroethylene containing a liquid lubricant into a tube or rod by a paste process, removing the liquid lubricant, stretching the tube or rod in the lengthwise direction, and thereafter, by sintering the stretched tube or rod at a temperature of at least 327.degree. C. wherein the stretching of the tube or rod is carried out by the use of at least one pair of heating rolls which are each provided with a plurality of grooves. The process provided uniform stretching making it possible to produce a tube or rod with very small internal diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.