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
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United States of America Patent
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Dec 31, 2013
Grant Date -
May 6, 2010
app pub date -
Nov 6, 2009
filing date -
Nov 6, 2008
priority date (Note) -
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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.
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