Applications of wet-end paper chemistry by Ian Thorn, Che On Au

By Ian Thorn, Che On Au

Very not often is paper produced with no assistance from chemical substances. This moment version of Applications of Wet-End Paper Chemistry describes the kinds, makes use of and alertness of many of the chemical substances used on the rainy finish of a paper, board and (to some degree) tissue laptop. The editors Dr. Ian Thorn (Business supervisor, relevant Europe) and Dr. Che On Au (Applications supervisor, Global), either operating at Eka chemical substances Ltd, Congresbury, united kingdom, have assembled a group of overseas participants who've gathered huge, immense event in operating with paper chemical compounds hired on the rainy finish of paper manufacture.

In fresh years, either environmental and financial pressures have motivated the improvement of extra effective paper and board machines and their rainy finish structures to enhance either creation and caliber. The authors, predominantly operating for chemical providers, describe the hot items and structures constructed as strategies to those new demanding situations.

Written basically for chemists and engineers operating within the mill, Applications of Wet-End Paper Chemistry can also be of specific worth to providers of paper chemical substances and to scholars of papermaking.

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The main addition points used for the retention and drainage aid components are illustrated in Fig. 4 – points 1–6. 78 87 88 89 90 91 92 93 94 95 43 + ++ + + + + + + + + + + + + + + + + + M ic ro p ol nt on Po l ym er -b e ar ch lic ast Si D Si n ua gl e lP ol Po l ym er ym er ite ym er Po ly si lic a m ic M ro i c ge s y ro ls st pa em r s ticle /m icr op ol ym er 3 Retention and Drainage - -- - - - - - ++++ + +++ +++ + + + ++ + + + + 1970 1980 Polyacrylamide Flocculants 1990 Microparticles - Silica - Bentonite Micropolymer 2000 High surface area silica microgels Fig.

Other products, known as biofilm inhibitors, are used as an alternative to microbicides. These products are applied without any complementary use of microbicides. For mills where environmental profile is important, this is an efficient alternative. Biofilm inhibitors have a more complex effect providing an effect in more than one of the five stages of biofilm formation. One approach makes use of three different mechanisms for biofilm control. Chemically this method of control comprises the combination of a surfactant component and a non-biocidal sulphonated lignin derivate into one formulated product.

Products used for filler and fines retention will partly retain organic colloidal material, although such products are not specific for colloidal material and not very efficient for the retention of colloidal material. More specific products, usually water-soluble highly charged cationic polymers of a molecular weight lower (less than 100,000 g/mole) than those used for fines and filler retention, are available to specifically retain colloidal organic material during sheet formation. It is believed that these products are able to bind the colloidal particles more strongly to the fibres, thereby minimising the potential deposit problems in the press and dry section due to an increase in colloidal material taken out with the paper.

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