초록 ▼

Apparatus and methods for spray coating selected areas of a circuit board with a liquid coating material without coating regions of the circuit board to be left uncoated. In one mode of operation, a bead of liquid coating material dispensed from an elongated nozzle tip is atomized by directing jets

Apparatus and methods for spray coating selected areas of a circuit board with a liquid coating material without coating regions of the circuit board to be left uncoated. In one mode of operation, a bead of liquid coating material dispensed from an elongated nozzle tip is atomized by directing jets of air pressurized against the bead to form a conical, swirling spray pattern which is sprayed on selected areas of a circuit board. In a second mode of operation, the non-atomized bead of liquid coating material dispensed through the elongated nozzle tip is applied on selected areas of the circuit board. In a third mode of operation, jets of pressurized air are directed against the bead of liquid coating material to create a soft swirl pattern, without atomizing the bead of coating material. In a second embodiment of the invention, the bead of liquid coating material is dispensed from a nozzle without the elongated nozzle tip.

대표청구항 ▼

[ What is claimed is:] [1.]1. A system for spray coating a substrate with a liquid coating material, comprising:a liquid spray device having a liquid delivery passageway for supplying liquid coating material and an air delivery passageway for supplying pressurized air;a nozzle mounted to said liquid

[ What is claimed is:] [1.]1. A system for spray coating a substrate with a liquid coating material, comprising:a liquid spray device having a liquid delivery passageway for supplying liquid coating material and an air delivery passageway for supplying pressurized air;a nozzle mounted to said liquid spray device having a nozzle tip extending outwardly therefrom and having a throughbore in flow communication with said liquid delivery passageway with a nozzle orifice disposed at the end of said throughbore to discharge said liquid coating material as a bead of liquid coating material, said nozzle including a plurality of air bores in flow communication with said air delivery passage to direct pressurized air against the outer periphery of said bead of liquid coating material discharged from said nozzle tip to form said liquid coating material into an atomized spray pattern with said liquid coating material swirling within said atomized spray pattern;said air bores being in air flow communication with said air delivery passageway by a common opening; said air bores being angled to direct jets of air therefrom to impinge substantially tangential to said outer periphery of said bead of coating material to atomize said bead into a conical spray pattern with said liquid coating material swirling within said conical spray pattern; anda controller operatively connected to said liquid spray device for selectively opening and closing said air delivery passageway of said liquid spray device whereby said bead of liquid coating material discharged from said nozzle orifice is applied to said substrate either as said swirling atomized spray pattern or as said bead of said liquid coating material.