A new retention aid for the production of SC printing grades: pilot paper machine results.Application: Mills may soon benefit from a new retention aid that demonstrated excellent results in pilot trials. A Pilot paper machine trial has demonstrated the efficiency of a new dendrimeric retention aid in the production of supercalendered (SC-A) paper. The new additive was particularly effective in retaining fines and day particles in the sheet. The first-pass retention increased by 6%, even at the addition rate of just 0.5 kg/metric ton. The highest gains in first-pass ash retention resulted from tests of the new additive with a flocculant. We found that the new retention additive did not impair sheet formation and that the sheet's physical properties were improved We attributed the high efficiency of dendrimer den·dri·mer n. A polymer in which the atoms are arranged in many branches and subbranches along a central backbone of carbon atoms. Also called cascade molecule. at low dosage rate to the high cationic cationic having qualities dependent on having free cations available. cationic detergents are wetting agents that disrupt or damage cell membranes, denature proteins and inactivate enzymes. charge available for charge neutralization neutralization, chemical reaction, according to the Arrhenius theory of acids and bases, in which a water solution of acid is mixed with a water solution of base to form a salt and water; this reaction is complete only if the resulting solution has neither acidic nor of anionic an·i·on n. A negatively charged ion, especially the ion that migrates to an anode in electrolysis. [From Greek, neuter present participle of anienai, to go up : ana-, ana- dissolved and colloidal colloidal of the nature of a colloid. colloidal bath a bath containing gelatin, bran, starch or similar substances, to relieve skin irritation and pruritus. materials. Because of its high cationic charge, the dendrimer additive can significantly improve runnability in closed system applications. S! Polverari is now a scientist with E.QU.I.P. International Inc., Baie d'Urfe, Quebec, Canada; Allen is principal scientist, Paprican, Pointe Claire, Quebec, Canada; Hamel is engineer, Paprican, Pointe Claire, Quebec, Canada; and Sithole is scientist, Paprican, Pointe Claire, Quebec, Canada. Email Allen at lhallen@paprican.ca |
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