Method of treating inner surface of plastic tube with plasma

Details Method of treating inner surface of plastic tube with plasma Method of treating inner surface of plastic tube with plasma

1983-03-03

1984-12-18

Lawrence, Evan K.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204165, 204168, H05H 124

Patent

active

044889542

ABSTRACT:
In plasma-treating the inner surface of a plastic tube, the invention provides a treating method which ensures stable treatment under readily operative conditions. The present invention relates to a method comprising the steps of placing a plastic tube inside an electrically insulating tube wherein the difference between the inner diameter of the insulating tube and the outer diameter of the plastic tube is equal to or less than 2 mm, letting a gas into the plastic tube, keeping the inner pressures of both tubes at a reduced pressure, applying a high voltage across electrodes disposed outside the electrically insulating tube to initiate and sustain discharge only inside the plastic tube and thereby plasma-treating the inner surface of the plastic tube.

REFERENCES:
patent: 4265276 (1981-05-01), Hatada et al.
Oberg et al., Machinery's Handbook, Third printing, New York, The Industrial Press, 1956, p. 1061.

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