On-line Tissue Softness Measurement – A useful addition to Tissue Automation Concept, PaperCon 2016

Up until now, the objective determination of tissue softness has only been possible with few test devices in the laboratory. The most widely used among the commercially available devices are Emtec’s laboratory device called Tissue Softness Analyzer (TSA) and the TechPap device using their MorFi module.

This paper describes an online method to measure tissue softness using a photometric stereo technique. This method was recently employed to determine the surface topography of tissue, paper, and board. In tissue grades, topography analysis of final tissue product after creping makes it possible to determine a number of useful quality parameters including tissue softness. The paper demonstrates how a variety of properties, some even complex or subjective by nature as softness, can be quantified using the image analysis techniques employed in the tissue softness sensor.

Results from trials on the pilot and production machines as well as from continuous use on a production machine are also presented and discussed. The online sensor correlates very well with laboratory testing methods.

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