PASTE EXTRUDED INSULATOR WITH AIR CHANNELS

The invention provides an insulated wire having a conductor and an insulator of paste extruded PTFE fine powder around the conductor. The paste extruded insulator has at least one closed continuous longitudinal air channel spaced apart from the conductor. The invention further provides a process for forming an insulator around a conductor by paste extruding lubricated PTFE fine powder in an extrusion device comprising a die, mandrel, and at least one channel-forming member. The die and mandrel form a converging chamber leading to an extrusion orifice and the channel-forming member is positioned in the orifice. The mandrel has a central bore for supplying the conductor. Lubricated PTFE fine powder is forced through the chamber and out of the exit of the orifice as a lubricated green extrudate around the conductor forming an insulator with at least one closed longitudinal air channel spaced apart from the conductor. 1. An insulated wire comprising a conductor and an insulator of paste extruded PTFE fine powder pressure coalesced around said conductor , wherein said insulator has at least one closed continuous longitudinal air channel spaced apart from said conductor.2. The insulated wire of wherein said insulator has multiple closed continuous longitudinal air channels spaced from each other.3. The insulated wire of wherein said longitudinal air channels are disposed symmetrically about the conductor.4. The insulated wire of wherein said insulator has been sintered.5. A coaxial cable comprising the insulated wire of .6. The insulated wire of wherein said insulator has a diameter of greater than about 8 mm.7. The insulated wire of wherein said insulator has a diameter greater than about 10 mm.8. A lubricated green extrudate of paste extruded PTFE fine powder pressure coalesced around a conductor claim 1 , said lubricated green extrudate comprising organic lubricant claim 1 , wherein said lubricated green extrudate has at least one closed continuous longitudinal air ...

Paste extruded insulator with air channels

The invention provides an insulated wire having a conductor and an insulator of paste extruded PTFE fine powder around the conductor. The paste extruded insulator has at least one closed continuous longitudinal air channel spaced apart from the conductor. The invention further provides a process for forming an insulator around a conductor by paste extruding lubricated PTFE fine powder in an extrusion device comprising a die, mandrel, and at least one channel-forming member. The die and mandrel form a converging chamber leading to an extrusion orifice and the channel-forming member is positioned in the orifice. The mandrel has a central bore for supplying the conductor. Lubricated PTFE fine powder is forced through the chamber and out of the exit of the orifice as a lubricated green extrudate around the conductor forming an insulator with at least one closed longitudinal air channel spaced apart from the conductor.

Paste extruded insulator with air channels

The invention provides an insulated wire having a conductor and an insulator of paste extruded PTFE fine powder around the conductor. The paste extruded insulator has at least one closed continuous longitudinal air channel spaced apart from the conductor. The invention further provides a process for forming an insulator around a conductor by paste extruding lubricated PTFE fine powder in an extrusion device comprising a die, mandrel, and at least one channel-forming member. The die and mandrel form a converging chamber leading to an extrusion orifice and the channel-forming member is positioned in the orifice. The mandrel has a central bore for supplying the conductor. Lubricated PTFE fine powder is forced through the chamber and out of the exit of the orifice as a lubricated green extrudate around the conductor forming an insulator with at least one closed longitudinal air channel spaced apart from the conductor.

Paste Extruded Insulator with Air Channels

The invention provides an insulated wire having a conductor and an insulator of paste extruded PTFE fine powder around the conductor. The paste extruded insulator has at least one closed continuous longitudinal air channel spaced apart from the conductor. The invention further provides a process for forming an insulator around a conductor by paste extruding lubricated PTFE fine powder in an extrusion device comprising a die, mandrel, and at least one channel-forming member. The die and mandrel form a converging chamber leading to an extrusion orifice and the channel-forming member is positioned in the orifice. The mandrel has a central bore for supplying the conductor. Lubricated PTFE fine powder is forced through the chamber and out of the exit of the orifice as a lubricated green extrudate around the conductor forming an insulator with at least one closed longitudinal air channel spaced apart from the conductor.

Paste extruded insulator with air channels

The invention provides an insulated wire having a conductor and an insulator of paste extruded PTFE fine powder around the conductor. The paste extruded insulator has at least one closed continuous longitudinal air channel spaced apart from the conductor. The invention further provides a process for forming an insulator around a conductor by paste extruding lubricated PTFE fine powder in an extrusion device comprising a die, mandrel, and at least one channel-forming member. The die and mandrel form a converging chamber leading to an extrusion orifice and the channel-forming member is positioned in the orifice. The mandrel has a central bore for supplying the conductor. Lubricated PTFE fine powder is forced through the chamber and out of the exit of the orifice as a lubricated green extrudate around the conductor forming an insulator with at least one closed longitudinal air channel spaced apart from the conductor.

PROCESS FOR THE MANUFACTURE OF STRETCHED, POROUS, MOLDED PARTS OF FLUORINATED POLYMER, PARTICULARLY POLYTETRAFLUORETHYLENE

PROCESS FOR THE MANUFACTURE OF MOLDED, STRETCHED, POROUS, FLUORINE POLYMERIC PARTS, ESPECIALLY POLYTETRAFLUORETHYLENE

a) Procédé pour la fabrication de pièces moulées, étirées, poreuses. b) Procédé caractérisé en ce que dans une première étape, on élimine par séchage dans un four 4 le lubrifiant pendant le passage du corps moulé, et dans une seconde étape, qui suit aussitôt, ce corps moulé est étiré, dans le sens de son passage, à une température de l'ordre au moins de la température de fusion des cristallites du polymère dont il s'agit, le polymère étant fritté dans un four de frittage 5 en même temps que la pièce moulée est étirée. c) L'invention concerne un procédé pour la fabrication de pièces moulées, étirées, poreuses. (CF DESSIN DANS BOPI) a) Process for the manufacture of molded, drawn, porous parts. b) A method characterized in that in a first step, the lubricant is removed by drying in an oven 4 during the passage of the molded body, and in a second stage, which immediately follows, this molded body is stretched in the direction of its passage, at a temperature of at least the order of the melting point of the crystallites of the polymer in question, the polymer being sintered in a sintering furnace 5 at the same time as the molded part is drawn. c) The invention relates to a process for the manufacture of molded, stretched, porous parts. (CF DRAWING IN BOPI)

Paste extruded insulator with air channels

The invention provides an insulated wire having a conductor and an insulator of paste extruded PTFE fine powder around the conductor. The paste extruded insulator has at least one closed continuous longitudinal air channel spaced apart from the conductor. The invention further provides a process for forming an insulator around a conductor by paste extruding lubricated PTFE fine powder in an extrusion device comprising a die, mandrel, and at least one channel-forming member. The die and mandrel form a converging chamber leading to an extrusion orifice and the channel-forming member is positioned in the orifice. The mandrel has a central bore for supplying the conductor. Lubricated PTFE fine powder is forced through the chamber and out of the exit of the orifice as a lubricated green extrudate around the conductor forming an insulator with at least one closed longitudinal air channel spaced apart from the conductor.

Production of porous elongate moulded bodies from fluorine-containing polymers

PASTE-EXTRUDED ISOLATOR WITH AIR CHANNELS

Procedimento per produrre corpi sagomati, porosi di forma allungata.