Apparatus and methods employing infrared absorption means to measure the moisture content of heavy grades of paper
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United States of America Patent
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Apr 18, 1989
Grant Date -
N/A
app pub date -
Nov 5, 1987
filing date -
Nov 5, 1987
priority date (Note) -
Expired
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Abstract
Apparatus and methods for use in measuring the moisture content of heavy-grade sheets of paper during their continuous manufacture. In one aspect, means employing infrared absorption techniques for determining the fiber weight per unit area of a sheet having a fiber weight of up to 1100 grams per square meter are provided. In another aspect, means employing infrared absorption techniques including the use of two moisture absorption bands and associated moisture reference bands for calculating the average temperature of the sheet are provided. The latter aspect may be used to produce an indication of moisture weight per unit area, wherein the indication is substantially independent on changes in the average temperature, and enables accurate measurement of the moisture weight per unit area of heavy grades of paper having moisture weights of up to 450 grams per square meter. The former aspect may be employed in measuring the moisture content of heavy grade of paper having moisture weights of up to 90 grams per square meter.
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