Analyzing 2-Dimensional Variation Based on Scanning and Imaging Measurements, PaperCon 2010 Conference

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Two methods for capturing the basis weight variation from imaging measurements have been developed. The problem is to estimate basis weight variation from the optical transmittance measurement which contains mixed information of many quality parameters. The first method calibrates with the scanning basis weight measurement the model relating the light transmittance and basis weight, whereas the second method uses the scanning measurement for filtering and replacing the transmittance measurement when necessary. The performance of the methods is evaluated with a simulator developed to describe the quality variations and control of the paper web. The simulated transmittance image is generated assuming a linear effect of basis weight, moisture and ash content on transmittance. The measurement modes and control options of the simulator are also presented.