Web coating and powder feed

Details Web coating and powder feed Web coating and powder feed

1976-04-13

1978-05-09

Stein, Mervin

Coating apparatus

With means to apply electrical and/or radiant energy to work...

Electrostatic and/or electromagnetic attraction or...

118DIG5, 118638, 427 32, 427185, B05B 502

Patent

active

040880931

ABSTRACT:
A system for electrodynamic powder coating of conducting and non-conducting substrates using an electrodynamic fluidized bed. The system generally includes a coating applicator means for applying charged particles to the substrate to be coated, and postcharging means for applying to the substrate an additional charge of such polarity as to cause an increase in the electrostatic forces holding the coating particles to the substrate. The system further includes a precharging means for precharging the substrate with a charge of such polarity as to effect more uniform coating of the substrate and a higher rate of coating. Where the substrate to be coated is a continuous web, the system includes a conveying means for conveying the web through the various positions adjacent to the three aforementioned means. The coating applicator means may be an electrodynamic coating apparatus of the electrodynamic fluidized bed type and comprising a fluidized bed means and a charging bed means with a porous wall positioned therebetween, and a recharging means.

REFERENCES:
patent: 3248253 (1966-04-01), Barford et al.
patent: 3537426 (1970-11-01), Spiller et al.
patent: 3640246 (1972-02-01), Jeromin et al.
patent: 3817211 (1974-06-01), Brown et al.
patent: 3953618 (1976-04-01), Muntz et al.

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