Apparatus for producing foamed plastic insulated wires

Details Apparatus for producing foamed plastic insulated wires Apparatus for producing foamed plastic insulated wires

1979-05-11

1981-04-07

Anderson, Philip

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Extrusion shaping means

264 37, 264 405, 264 459, 264 50, 425145, 425149, 425467, B29D 2700, B29F 310

Patent

active

042603510

ABSTRACT:
An apparatus for producing a foamed plastic insulating coating in a wire. A gaseous foaming agent is mixed with a resin and passed through a high pressure narrow passage and then through a lower pressure wide passage.
The release of pressure, when the resin enters the wide passage, results in a foaming of the resin. The foamed resin is thereafter extruded through an orifice onto a wire. In one embodiment a chemical is added to serve as a nuclei for the gas bubbles formed during foaming. In a second embodiment, a second chemical is added to provide a smoother extruded surface. In still a further embodiment, the pressure in the wide passage is automatically controlled to remain at a predetermined preferred pressure.

REFERENCES:
patent: 2246149 (1941-06-01), Troche et al.
patent: 2766481 (1956-10-01), Henning
patent: 3278988 (1966-10-01), Hannis
patent: 3300554 (1967-01-01), Bachus
patent: 3353209 (1967-11-01), Schad
patent: 3704972 (1972-12-01), Kneller et al.
patent: 3845184 (1974-10-01), Nackaerts
patent: 3936519 (1976-02-01), Crystal
patent: 3947172 (1976-03-01), Myers

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