Thin walled protective coatings by electrostatic powder depositi

Details Thin walled protective coatings by electrostatic powder depositi Thin walled protective coatings by electrostatic powder depositi

1976-05-06

1978-08-01

Smith, Ronald H.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427 27, 427 32, 427118, 427195, 427202, 427203, 427407R, 427407A, 427407B, 427409, 427410, B05D 106

Patent

active

041044169

ABSTRACT:
A process for producing thin walled coatings on elongated substrates by the electrostatic application of two superimposed layers of powder material is disclosed. The process comprises the steps of applying electrostatically a first layer of fusible powder material to an elongated substrate, at least partially fusing such first layer of powder material to provide a uniform coating on the elongated substrate, holding the at least partially fused coating at an elevated temperature below the full fusion temperature of the powder material to be applied as the second layer immediately prior to the application of such second layer, applying electrostatically a second layer of fusible powder material to the first layer, and fusing the total applied coating to achieve the desired coating thickness.

REFERENCES:
patent: 3377183 (1968-04-01), Hurt et al.
patent: 3513012 (1970-05-01), Point
patent: 3708321 (1973-01-01), Spieles
patent: 3814616 (1974-06-01), Kondo et al.
patent: 3824115 (1974-07-01), Segawa et al.
patent: 3937853 (1976-02-01), Shank
Kut, Epoxy, "Acrylic and Polyester Thermosetting Powders are Moving Toward Practical Applications", Metal Finishing, Jun. 1973, pp. 41-45.

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