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Extra resources for Developments in Tissue Chemicals and Chemical Treatments
Example text
G. machine speed) to keep the machinery clean to prevent problems caused by foam to assist in water-removal during the formation of the paper. Retention drainage and formation aids In manufacturing any paper sheet, retention and drainage aids are important process-improving aids. Paper-making can be considered as a continuous filtration process where a tissue fibre furnish is separated on a machine fabric and the majority of the water is removed. The rate at which the materials in the fibre furnish can be separated from the water determines the rate at which paper can be produced, and drainage rates have a significant bearing on the economics of paper-making.
G. 3% chelating agent (diethylene triamine penta-acetic acid, DTPA). In this formulation, the soap (fatty acids or the derivatives) acts as a collector, and the sodium silicate and the chelating agents are added to stabilise the hydrogen peroxide bleaching solution. Bleaching prevents the irreversible yellowing of pulp during the process and can be accomplished by an oxidative bleaching step with hydrogen peroxide, bleaching with hypochlorite (with the disadvantage of producing chlorinated organic compounds in the effluents), or by reductive post-bleaching with sodium dithionite or formamidine sulphinic acide (FAS).
Examples of dual component polymer systems are: cationic starch and anionic polyacrylamide polyethylenimine and anionic polyacrylamide cationic polyacrylamide and anionic polyacrylamide. The cationic component is usually added first, to provide cationic sites on the surfaces to which the anionic polyacrylamide attaches, bridging the furnish components and flocculating via a bridging mechanism. At the beginning of the 1980s, a new technology was introduced. This involved the use of anionic inorganic particles and a cationic polymer, and became known as a microparticle retention aid system.