Electric wire having a PTFE covering that is robust and that has a low dielectric constant, and a method and a tool for manufacturing the same
US8618417B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2009 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Sep 22, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B7/0233
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric wire that has a conductor held by spacers in a covering of polytetrafluoro-ethylene (PTFE), continuous cells being formed between the covering, the spacers, and the conductor. In an axial section, the majority of the PTFE fibers of the spacers point in a substantially radial direction, thereby imparting excellent robustness to the spacers. A method of manufacturing such an electric wire, in which method an extrudate of PTFE is caused to pass through an extrusion passage around the conductor in such a manner as to form the covering; so that: upstream from an expansion section, the covering is formed by a guide; and downstream from this section, the cells are formed by section members, the spacers being formed by filling expansion channels situated between walls of the section members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.