Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1995-04-03
1998-03-31
Bareford, Katherine A.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427287, 427420, 427424, 118324, B05D 500, B05C 500
Patent
active
057335974
ABSTRACT:
Coating dispenser apparatus and methods which utilize a snuff back device for removing a small amount of coating material from the discharge passage of the dispenser upon shut-off thereof at the end of a coating run. A control is provided which discharges the material removed from the discharge passage back into the discharge passage upon a predetermined delay after the start of the next coating run. The disclosed methods contemplate the discharge of coating material back into the discharge passage in the middle of the next coating pattern, or depending on the application, during any segment of the next coating pattern after a defined leading edge of the pattern is created, during which segment the coating material discharged back into the discharge pattern smoothly blends into the coating pattern as it is applied to a substrate. The apparatus and methods are especially useful for applying conformal coating patterns onto circuit boards.
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Benecke Jurgen
Boger Bentley
Burmester Thomas
Cieplik Arthur
Rivas Antonio
Bareford Katherine A.
Nordson Corporation
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