Read e-book online Applications of wet-end paper chemistry PDF
By Ian Thorn, Che On Au
Very hardly ever is paper produced with no assistance from chemical substances. This moment version of Applications of Wet-End Paper Chemistry describes the categories, 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 computer. The editors Dr. Ian Thorn (Business supervisor, significant Europe) and Dr. Che On Au (Applications supervisor, Global), either operating at Eka chemical compounds Ltd, Congresbury, united kingdom, have assembled a staff of overseas participants who've accrued huge, immense adventure in operating with paper chemical compounds hired on the rainy finish of paper manufacture.
In fresh years, either environmental and fiscal pressures have stimulated the improvement of extra effective paper and board machines and their rainy finish structures to enhance either construction and caliber. The authors, predominantly operating for chemical providers, describe the hot items and platforms built as strategies to those new demanding situations.
Written essentially for chemists and engineers operating within the mill, Applications of Wet-End Paper Chemistry is usually of specific price to providers of paper chemical substances and to scholars of papermaking.
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Extra resources for Applications of wet-end paper chemistry
Ash in 100 ml thin stock − wt ash in 100 ml whitewater ) × 100% wt. ash in 100 ml thin stock Variables are 1. Stirrer speed – the minimum speed used is usually that which keeps the wire clean and does not allow a fibre mat to form. Higher speeds can be used when endeavouring to match the retention achieved on a particular paper machine (on the original Britt Jars stirrer torque can also be varied). 2. Wire used – a number of wires with different mesh sizes are available. When a piece of machine wire or a larger hole size Britt screen is used, lower retention measurements, more realistic in terms of on-machine results are achieved.
81 82 The products normally considered as the effective retention and drainage aid additives are: 83 84 85 86 96 97 Polyacrylamide flocculants: low, medium or high molecular weight products of low, medium or high charge (cationic or anionic) and no charge (nonionic); available in a variety of physical forms – liquid dispersion, emulsion or solid grade Polyethyleneimine: low molecular weight but structured cationic products available as liquids, generally these are more effective as drainage aids Polyethylene oxide: very high molecular weight nonionic products, available as solid grades or dispersion/slurry Microparticles: silica-based colloids, sol (milky colloid) or polysilica microgels (available as liquids or generated on-site), bentonites or other inorganic silicates available as powder or slurry Micropolymers: polyacrylamide-based anionic or cationic structured polymers or cross-linked particles, available as emulsions or dispersions Others: combination products which are mixtures or water-in-water emulsion products containing both coagulant and flocculant, available as liquids 98 99 100 101 102 103 104 As machine speeds have increased and wet-end system chemistry has become more complex, the demands on the retention and drainage aid have increased considerably.
Chemically this group of wood component, insoluble in water but soluble in organic solvents, comprises a large group of different components. These can be divided into four groups: aliphatic components and terpenoids. Aliphatic components comprise predominantly fat, being predominantly fatty acid esters of glycerol, and their corresponding free fatty acids, but also waxes. The fatty acids are long chain aliphatic monocarboxylic acids predominantly with a chain length between 16 and 24 carbon atoms.
Applications of wet-end paper chemistry by Ian Thorn, Che On Au