Publications:Colour speck counter for assessing the dirt level in secondary fibre pulps

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Title Colour speck counter for assessing the dirt level in secondary fibre pulps
Author Antanas Verikas and Kerstin Malmqvist and Lars Bergman and P. Engstrand
Year 2003
PublicationType Journal Paper
Journal Journal of Pulp and Paper Science (JPPS)
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Abstract Speck count is increasingly used as a parameter to assess the quality of secondary fibre pulps. The resolution of most of the commercial image analysis systems is too low for detecting small specks. Therefore, small specks are not taken into consideration when using conventional image analysis systems to assess pulp quality. We have recently developed a colour speck counter which can detect specks ranging in size from ∼5 to 300 μm. In this paper, we present the results of experimental investigations related to the use of the speck counter to assess the dirt level in secondary fibre pulps. We assume an exponential speck size distribution and advocate the idea of using the scale parameter λ of the distribution to characterize the size content of a set of specks detected. Experimental investigations performed have shown that the scale parameter, together with the expected speck area and the speck number, can be used to characterize and rank secondary fibre pulps according to dirt level and the dirt-size distribution.