Method for detecting colored foreign particles in light-colored

Details Method for detecting colored foreign particles in light-colored Method for detecting colored foreign particles in light-colored

1989-05-25

1990-12-11

McGraw, Vincent P.

Optics: measuring and testing

With sample preparation

Depositing particles on optical surface

356237, 356445, G01N 2128, G01N 2185, G01N 2189

Patent

active

049765400

ABSTRACT:
An efficient and reliable method and a system are proposed for detecting colored foreign particles in a white or light-colored powdery product such as a polyvinyl chloride resin with an object of product inspection and quality control. The method comprises the steps of eliminating static electricity from the powder, e.g., by spraying ethyl alcohol, continuously feeding the powder at a controlled rate on to a belt conveyor to form a uniform powder layer having a flat and even surface thereon, bringing the powder layer below a reflection-type laser-beam scanning detector projecting a laser beam with scanning and receiving the reflected beam and monitoring the output signals coming out of the detector.

REFERENCES:
patent: 3549263 (1970-12-01), Osawa et al.

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