Method and apparatus for forming elongate PTFE material and PTFE material particularly dental floss
US5657779A · kind A · utility
13Cited by
7References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1995 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Oct 2, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2027/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An elongate PTFE material is formed by passing an unsintered PTFE tape across a heated surface in sliding contact therewith while applying tension to the tape, such that the PTFE tape, when its temperature is raised by contact with the heated surface, is longitudinally stretched with simultaneous width and thickness reduction while in contact with the surface. PTFE tapes having different properties, e.g. coefficients of friction at opposite faces can be produced. Such tapes are suitable for use as dental flosses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.