Procedure for determining coating rates

Details Procedure for determining coating rates Procedure for determining coating rates

1982-05-26

1984-07-03

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Fluorescence

378210, G01N 2322

Patent

active

044583605

ABSTRACT:
The invention concerns a procedure for measuring the coating quantities contained in coating layers deposited on both sides of paper, cardboard or equivalent material in the case in which both coating layers contain the same component emitting characteristic radiation. In the case most commonly encountered, both coating layers consist of the same coating material. In the procedure two functionally mutually independent radiation source/detector pairs are used, between which the coated paper or equivalent is placed. Separately each radiation source/detector pair effects excitation of fluorescent radiation in both coating layers under measurement and the total intensity of the excited radiation present at the detector is measured. If the base weight of the paper or equivalent is known, the coating rates are calculable from the results of measurement obtained. The base weight is most advantageously measured before the coating step with the aid of a separate source of radiation and a transmission detector.

REFERENCES:
patent: 4147931 (1979-04-01), Puumalainen
patent: 4377869 (1983-03-01), Venalainen

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