Method for producing foamed plastic insulated wires

Details Method for producing foamed plastic insulated wires Method for producing foamed plastic insulated wires

1978-04-03

1980-01-08

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Positioning of a mold part to form a cavity or controlling...

264 459, 264 50, 264DIG5, 264DIG13, B29D 2700

Patent

active

041827341

ABSTRACT:
A method for producing a foamed plastic insulating coating in a wire. A gaseous foaming agent is mix 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: Re29886 (1979-01-01), Dembiak et al.
patent: 2246149 (1941-06-01), Troche et al.
patent: 3251911 (1966-05-01), Hansen
patent: 3300554 (1967-01-01), Bachus
patent: 3456298 (1969-07-01), Foster et al.
patent: 3554932 (1971-01-01), Overcashier
Hansen, Ralph H. and William M. Martin, "Novel Methods for the Production of Foamed Polymers", in I&EC Product Research and Development, vol. 3, No. 2, Jun. 1964, pp. 137-141.

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