Method of manufacturing a polytetrafluoroethylene tape
US5474727A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1993 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | Dec 21, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2027/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing a PTFE tape whose density is less than or equal to 0.3 g/cm.sup.3, the method being characterized in that a raw PTFE tape is subjected to a first step of stretching while being heated so as to reduce its density to within the range 0.7 g/cm.sup.3 to 0.30 g/cm.sup.3, after which at least one step is performed of the type including a stage during which the tape is stabilized without changing the state of the PTFE by being passed through an oven at a temperature and for a duration that are functions of the mass to be stabilized while keeping the tape under tension so that its density does not increase, followed by a stage of stretching under heating so that the density of the tape reaches a value lying in the range 0.2 g/cm.sup.3 to 0.12 g/cm.sup.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.