Optimization of Wet-end Process by Slime Control Agent “CURECIDE” and Coagulant “REALIZER”

In recent years, there has been an increasing trend toward more paper making defects and paper breakage problems in paper machines. Paper making conditions are becoming more severe due to the decline in the quality of pulp and recovered paper raw materials and the accumulation of contaminants caused by the closed paper machines. The focus of this study was on the fact that, based on the results of analysis of paper making defects and paper machine tool deposits, there are many cases in which slime involving microorganisms, adhesive pitch consisting of vinyl acetate, styrene, and acrylates mixed in from recovered paper, and anion trashes form a complex foreign matter. To improve the operation of paper machines, it is essential to reduce paper defects and breaks, and many paper machines have similar problems.<br>In terms of paper quality, the dosage of additives such as sizing agents and paper strength agents added tends to increase in order to improve and maintain quality, and in some cases, the fixation of these additives is poor. If these unsettled additives circulate and accumulate in the system, they can cause paper making defects and trouble with stains on the paper machine tools. To improve the operation of the paper machine, such as to reduce the number of paper breakages and defects, it is important to optimize the dosage of various additives without degrading the quality of the paper.<br>We have applied the slime control agent “CURECIDE Series” and the multifunctional coagulant “REALIZER A Series” to various fields such as paper machines, paperboard machines, and household paper machines, and conducted tests to improve the operability and paper quality of paper machines using the optimum addition method and optimum addition amount. The results of the tests will be presented.