Efficient tissue process for cost reduction and material savings: simulation-enhanced process development and performance optimization, Tissue2017
The operation of a shoe press against the Yankee in dry crepe tissue paper production brings several advantages compared to a conventional press nip; product quality can be enhanced, raw material can be saved and energy consumption can be reduced. Decades after its introduction, the tissue shoe press has not changed significantly.
The work presented here is the result of a Voith Paper and Duni/Rexcell joint development project aimed at greatly improving the efficiency of dry crepe tissue production. The objective of this collaboration was to reduce the environmental impact and to increase the performance of the production process. In dry crepe operation mode, and in combination with a shoe press, TissueLev, a pre-dewatering system positioned before the press, provides additional dryness after the press section. The pre-dewatering system enables a different operation point as the sheet enters the press in a modified state. This results in increased production capacity, a reduction of thermal drying energy and potential for fiber savings.
A simulation-enhanced approach has been used to accelerate and focus process development and performance optimization. It combines, on the one hand, trials on the pilot plant and at the customers’ production site in Sweden. On the other hand, different simulation techniques are used: multiphysics system simulation, computational fluid dynamics (CFD) simulation, and image analysis and flow simulation of porous structures. The combined use of and process development cycles and reduced risk. Furthermore, it enables insight process views and deepens process knowledge.
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