Process of producing a foamed plastic insulated conductor and an

Details Process of producing a foamed plastic insulated conductor and an Process of producing a foamed plastic insulated conductor and an

1979-02-21

1980-10-21

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 402, 264 459, 264 50, 264174, 425162, B29D 2700

Patent

active

042293928

ABSTRACT:
This invention relates to a process of producing a foamed plastic insulated conductor. This process comprises the steps of forming a foamed insulation on a conductor wire by means of a gas injecting extruder and passing said conductor wire having said foamed insulation through telescopic cooling trough means including a movable trough to be adjusted in its position relative to a head of said gas injecting extruder so as to obtain a given value of a capacitance of the foamed plastic insulated conductor in accordance with an electrical signal from a capacitance monitor to detect a value of said capacitance of the foamed plastic insulated conductor. The process of the invention is characterized by further comprising the steps of detecting the position of the movable trough adjacent to its critical or limit positions and adjusting the injection rate of the foaming gas so as to move the movable trough to the middle position of the range of movement thereof.
This invention also relates to an apparatus for effecting the above-mentioned process.

REFERENCES:
patent: 2820987 (1958-01-01), Bunch
patent: 2928130 (1960-03-01), Gray
patent: 3914357 (1975-10-01), Cereijo et al.
patent: 3968463 (1976-07-01), Boysen
patent: 3972970 (1976-08-01), Taylor
patent: 3975473 (1976-08-01), Mulvaney
patent: 3981649 (1976-09-01), Shimano et al
patent: 4137754 (1979-02-01), Colombo et al.

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