Atmospheric pressure method and apparatus for removal of organic

Details Atmospheric pressure method and apparatus for removal of organic Atmospheric pressure method and apparatus for removal of organic

1996-06-18

1997-12-02

Pascal, Robert

Electric heating

Metal heating

By arc

21912119, 216 66, 216 67, 31511181, B23K 1500

Patent

active

056932413

ABSTRACT:
A gas stream containing ionic and atomic oxygen in inert gas is used to remove organic matter from a substrate. The gas stream is formed by flowing a mixture of gaseous oxygen in an inert gas such as helium at atmospheric pressure past a high voltage, current limited, direct current arc which contacts the gas mixture and forms the ionic and atomic oxygen. The arc is curved at the cathode end and the ionic oxygen formed by the arc nearer to the anode end of the arc is accelerated in a direction towards the cathode by virtue of its charge. The relatively high mass to charge ratio of the ionic oxygen enables at least some of it to escape the arc before contacting the cathode and it is directed onto the substrate. This is useful for cleaning delicate substrates such as fine and historically important paintings and delicate equipment and the like.

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