In this paper, we propose cost reduction of paperboard by reducing pitch-troubles and improving the efficiency of wet-end additives.
FR-801, FR-701 H, and MT-910 are cationic organic polymers whose molecular weight, charge density and composition are designed appropriately, therefore, they are very effective in reducing pitch troubles such as web breaks and pitch deposition on machinery. These polymers also have high ability to fix size on pulp effectively and to decrease consumption of size. Furthermore, these polymers can be used as a substitute for Alum.
In order to prevent the excess consumption of additives, selecting the most suitable drainage and retention aids (D-R aids) are important. The effects of D-R aids depend on the kinds of machine and paper, and are influenced by pH, electric conductivity, alum and paper strength agents. Therefore, we have been developing the different type of D-R aids with various charge density and flocculation ability. The polymers of these D-R aids have been designed as the contracted conformation in order to improve retention and drainage without the deterioration of dewatering, formation and paper strength. As the result, excess consumption of other additives is restrained.
Using these additives having high abilities can decrease the consumption of paper additives and improve runnability. And consequently, it is effective in reducing production cost.
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