Apparatus for manufacturing porous polytetrafluoroethylene material
US4671754A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Dec 31, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Apparatus for manufacturing a porous polytetrafluoroethylene material comprising extruding or rolling or a process consisting of the both an unsintered polytetrafluoroethylene mixture containing a liquid lubricant, and carrying out simultaneously next four steps of (a) evaporating a liquid lubricant, (b) stretching the molded articles in an unsintered condition, (c) sintering the same in a stretched condition, and (d) stretching the same in a sintered condition at an atmospheric temperature of more than 390.degree. C. to obtain mechanical strengths such as a Young's modulus of more than 10000 kg/cm.sup.2, and a matrix tensile strength of more than 1100 kg/cm.sup.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.