METHOD AND APPARATUS TO MONITOR AND CONTROL SHEET CHARACTERISTICS ON A CREPING PROCESS
First Claim
1. A method of measuring the geometric characteristics of a crepe structure on a paper sheet, the method comprising the steps of:
- generating data values representing characteristics of positions on a paper sheet by repeatedly emitting at least two emission beams against each of the positions on the paper sheet and reflecting the two beams off of the positions and into a sensor constructed and arranged to absorb and measure the intensity of the reflected emission beams,correcting the measured intensity of the data values by using an nth order polynomial fit,performing a row-by-row smoothing operation of the corrected data values using a filter algorithm,identifying positive to negative transitions within the smoothed data values, andcorrelating the identified transitions with previously identified values known to correspond to particular geometric dimensions to determine geometric features of the crepe structure.
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Abstract
The invention embodies methods and apparatuses to monitor and control the characteristics of a creping process. The method involves measuring optical properties of various points along a creped paper sheet and converting those measurements into characteristic defining data. The invention allows for determining the magnitude and distribution of crepe structures and their frequency and distribution. This allows for the generation of information that is accurate and is much more reliable than the coarse guessing that is currently used in the industry. Feeding this information to papermaking process equipment can result in increases in both quality and efficiency in papermaking.
19 Citations
12 Claims
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1. A method of measuring the geometric characteristics of a crepe structure on a paper sheet, the method comprising the steps of:
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generating data values representing characteristics of positions on a paper sheet by repeatedly emitting at least two emission beams against each of the positions on the paper sheet and reflecting the two beams off of the positions and into a sensor constructed and arranged to absorb and measure the intensity of the reflected emission beams, correcting the measured intensity of the data values by using an nth order polynomial fit, performing a row-by-row smoothing operation of the corrected data values using a filter algorithm, identifying positive to negative transitions within the smoothed data values, and correlating the identified transitions with previously identified values known to correspond to particular geometric dimensions to determine geometric features of the crepe structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification