Optimizing the dewatering pressure profile for papermaking furnishes, 2012 PaperCon Conference

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In this paper we present an improved experimental method for studying initial dewatering process in papermaking. Effect of the dewatering pressure profile and the furnish type on the development of flow resistance and final solid content of the sheet is studied. Major difference to previous studies is the possibility to control the dewatering pressure profile during each filtration. The filtration process is monitored by measuring the pressure drop over the filtrated sheet,the velocity of the suspension surface and the final solid content. Finallythe sheet is analysed for its z-directional porosityusing X-Ray microtomography andfines distribution using a sheet splitting technique.