Natural fibre products
- Printing and writing papers
- Paperboards
- Tissue
- Nonwovens
- Speciality papers
- Production of paper and board
- Stock and water systems
- Web forming
- Wet pressing
- Drying of natural fibre products
- Surface sizing
- Pigment coating
- Finishing
- Converting of paper and board
- Papermaking chemistry
- Paper physics
- Printing
Laminar shear on wire In the web forming process, several hydrodynamic forces affect the distribution of fibre orientations in paper. The most important is the speed difference between the suspension jet and wire. We give below a simplified analysis of the speed difference with a prediction for the shape of the distribution function. Other significant
Authors & references
Edited by:
Professor Jouni Paltakari, Aalto University
Based on: Niskanen, K. & Pakarinen, P. Paper Structure (Chapter 1). In: Niskanen, K. (ed), Paper Physics, (Book 16), Papermaking Science and Technology. 2nd edition. Jyväskylä, 2008, Finnish Paper Engineers’ Association/Paperi ja Puu Oy. pp. 11 – 58. More literature references can also be found in this chapter.
References:
- Parker, J., “The Sheet-Forming Process”, STAP No. 9, TAPPI, Atlanta, 1972.
- Niskanen, K. J., “Distribution of fibre orientations in paper”, Fundamentals of Papermaking (C. F. Baker and V. W. Punton, Eds.), Mech. Eng. Publ,, London, 1989, vol. 1, pp. 275–308.
- Ryti, N., Aaltonen, P., Perttilä, T., et al., Paperi Puu 51(3):207(1969).
- Perkins, R. W. and Mark, R. E., “Some new concepts on the relation between fibre orientation and mechanical properties”, The Role of Fundamental Research in Paper Making (J. Brander, Ed.), Mech. Eng. Publ., London, 1983, vol. 1, pp. 479–525.
- Rigdahl, M., Andersson, H., Westerlind, B., et al., Fibre Sci. Tech. 19(2):127(1983).
- Kallmes, O. J., Kufferath, W., and Thorpe, B. A., “The Origin and Alleviation of the CD Variations in the Physical Properties of Paper”, Papermaking Raw Materials (V. Punton, Ed.) Mech. Eng. Publ., London, 1985, vol. 2, pp. 445–482.
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This page has been updated 25.11.2020