Applications of Wet-End Paper Chemistry

1. Front Matter

   Pages i-xii

   PDF

2. Papermaking chemicals and their function

   • L. Wågberg, L. Winter

   Pages 1-12

3. The use of retention and drainage aids in the wet-end

   • C. O. Au, K. Johansson, I. Thorn

   Pages 13-26

4. The source and control of paper machine deposits

   • T. Hassler

   Pages 27-53

5. Fillers for papermaking

   • R. A. Gill

   Pages 54-75

6. Starch in papermaking

   • M. Georgeson

   Pages 76-90

7. The improvement of dry strength by synthetic polymers

   • S. N. Jenkins

   Pages 91-101

8. The practical application of wet-strength resins

   • F. Linhart

   Pages 102-119

9. The use and mis-use of dyestuffs and fluorescent whitening agents

   • F. Colling

   Pages 120-138

10. Sizing in acid, neutral and alkaline conditions

    • P. Otway, D. C. Johnson

    Pages 139-171

11. On-line monitoring and control in the wet-end

    • T. Sopenlehto

    Pages 172-182

12. Foam control in the mill: A practical review

    • M. R. Hunt

    Pages 183-196

13. Back Matter

    Pages 197-200

    PDF

Commercial demands and increasing global competition have led to enormous mechanical evolution over recent years. Twin-wires, wide-nip presses, steam boxes and speed sizers have all played a part in improving both the productivity and quality of paper and board products. With the emphasis on mechanical and electrical engineering and the ever increasing pressures of quality measurement and control, little time has been available within a technical department for much reflection on the chemistry of the process. Thus there is a growing trend for the management of the wet-end to be delegated to the chemical supplier. The advances in scale of paper manufacture, environmental sensitivity and higher quality of end-product requirements have all had an impact on the chemistry of the wet-end. The increased production means, for example, that down time is more of an anathema now when capacity is critical. Similarly, with the greater rigours of quality management, anything which causes breaks or holes must be eradicated. Environmental pressures too are growing on the papermaking process. Even if consideration is restricted to only the closure of the white water circuit, it alone throws down a challenge to the potency of biocides, retention aids and other chemicals. These chemicals are detriment­ ally affected by an increasing concentration of water soluble pulp extractives and surfactants, adhesives and polysaccharides from broke and recycled paper.

• acid
• bridge
• chemicals
• chemistry
• control
• engine
• industry
• machine
• polymer
• polymers
• research

• Paper Chemicals Division, Eka Nobel Ltd., Worle, Weston-super-Mare, UK

  Che On Au

• Eka Nobel Ltd., Worle, Weston-super-Mare, UK

  Ian Thorn

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