Method for achieving and maintaining an oxygen-deficient inert a

Details Method for achieving and maintaining an oxygen-deficient inert a Method for achieving and maintaining an oxygen-deficient inert a

1990-04-30

1992-01-07

Beck, Shrive

Coating processes

Pretreatment, per se, or post-treatment, per se

427445, 427 35, 427 541, 427 531, 118DIG7, 118733, B05D 300, B05D 306

Patent

active

050790455

ABSTRACT:
A method and apparatus are disclosed for achieving and maintaining an inert atmosphere as oxygen-deficient as possible in a treatment chamber, having a reaction zone, particularly an irradiation chamber, traversed by a length of material, wherein the length of material is supplied to the chamber through an inlet channel and conducted from the chamber through an outlet channel. A circulating inert gas stream, which detaches the entrained gas boundary layer held by the material, is moved countercurrently to the length of material in the inlet channel and is supplemented in a controlled manner with fresh inert gas in such amount that a given maximum oxygen concentration is not exceeded in the reaction zone and the flow rate of the inert gas stream is controlled, so that the pressure before the exit gap of the outlet channel is the same or slightly higher than the surrounding pressure.

REFERENCES:
patent: 4336279 (1982-06-01), Metzger
patent: 4444814 (1984-04-01), Flinchum et al.
patent: 4508750 (1985-04-01), Foll et al.
patent: 4636405 (1987-01-01), Mensah et al.
Bird et al., "Boundry-Layer Theory", in Transport Phenomena, pp. 140-147, John Wiley & Sons, Inc., N.Y., N.Y., 1960.

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