Electrostatic coating blade and method of applying a thin layer

Details Electrostatic coating blade and method of applying a thin layer Electrostatic coating blade and method of applying a thin layer

1986-08-20

1989-05-16

Beck, Shrive

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

118626, 239 3, 239690, 239521, B05D 500

Patent

active

048308722

ABSTRACT:
An electrostatic blade is disclosed having a slot extending the length of the blade and leading from a central duct to an outlet. A surface made of non-conductive material extends in front of the outlet and terminates in a discharge edge which is spaced 0.05 to 4 mm from the slot outlet. In use, liquid is passed from the duct along the slot to the outlet where it collects as a bead. An electrostatic field is applied between the liquid at the slot outlet and the object to be coated which draws liquid along the non-conductive surface in a tapering stream and further causing the liquid to be discharged from the edge. Because the stream of liquid reaching the discharge edge is very thin, very low liquid discharge rates can be achieved while still maintaining a uniform coating on the target object.

REFERENCES:
patent: 2695002 (1954-11-01), Miller
patent: 2782074 (1957-02-01), Sedlacsik
patent: 2860599 (1958-11-01), Rice et al.
patent: 3486483 (1969-12-01), Tilney et al.
patent: 3735925 (1973-05-01), Benedek et al.
patent: 4356528 (1982-10-01), Coffee
Otterway et al., "Blades for Electrostatic Coating", International Application (PCT), Apr. 26, 1984, Publication No.: WO84/01524.
Noakes, et al., "Spraying Apparatus", European Patent Application No. 0194074, Sep., 10, 1986.

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