Chemistry

Applications of Wet-End Paper Chemistry by L. Wågberg, L. Winter (auth.), Che On Au, Ian Thorn (eds.)

By L. Wågberg, L. Winter (auth.), Che On Au, Ian Thorn (eds.)

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1 Origin of organic deposits of water insoluble components. Organic deposits can either originate from the tree itself or from man-made substances getting into the papermaking process either from recycled broke or waste paper or through additives. An organic deposit originating from the tree itself is often called 'pitch', or sometimes 'troublesome pitch' to make the distinction with pitch that does not form a deposit. Deposits of man-made origin are called either 'stickies' (from their physical characteristics) or 'white pitch' (from their whitish colour).

J. , 97 (1984) 62. , Tappi, 73(8) (1989), 121-127. A. , Proceedings, CPPA Annual Conference, Montreal, Canada (1993). Wackerberg, E. , Proceedings, NTF Spring Meeting, Sarpsborg, Norway (1990). O. , Proceedings, SPCI Conference, New available techniques and current trends, Bologna, Italy (1992). D. thesis, UMIST, Manchester, England (1987). , Proceedings, PIRA Conference, Chemistry of neutral papermaking, Slough, England (1987). 3 The source and control of paper machine deposits T. 1 Introduction Modern papermaking is, from a mechanical point of view, a very well refined process utilizing what might well be the most advanced process control used in any industry.

Often suitable formulations also contain alkali or acid depending on the composition of the material building up a deposit in the felt. All the above methods are used in the industry to minimize organic deposition and the best result is often achieved by minimizing the contribution of a deposit using a combination of these methods. However, there is no single solution that will provide the complete remedy to all deposition of organic material. Deposition of additives (defoamer, sizing agent etc) can often be prevented by avoiding excessive use, by changing the product or changing the addition point.

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