Folding endurance Folding endurance or folding strength is the ability of a strip of paper to resist breaking when folded under a certain load. This load is constant but is generally only a small fraction of the tensile strength of the paper. The folding strength is expressed directly as the number of double folds that
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Folding endurance
After reading this article you will..
- know that the Zero-span tensile strength measures the single fibre strength, not the paper strength.
- understand that when interpreting foldability results you need to be aware that the results obtained with different testers are different although they follow the same ISO standard.
- know that low surface strength may create linting problems or cause runnability problems.
Content
Material testing and product properties
- Why test pulp and paper?
- Fibre properties
- Papermaking properties of pulp
- Fluff pulps
- Chemical analysis of pulps
- General physical properties of paper and board
- Optical properties of paper
- End-use properties of printing papers
- End-use properties of packaging papers and boards
- Tissue papers
- Permanent papers
- Reliability of results in physical testing of pulp and paper
- Quality control at the mill
- Standardisation in pulp and paper testing
Authors & references
Edited by:
Petteri Maijanen, ABB
Original author:
Jan-Erik Levlin
Based on: Levlin, J-E. General physical properties of paper and board (Chapter 7). In: Levlin, J-E. & Sjöderhelm, L. (ed), Pulp and paper testing (Book 17), Papermaking Science and Technology. Jyväskylä. 1999. Fapet Oy. pp. 136–161.
References:
- Kahlson, T. and Mårtensson, B., Paperi Puu 46(10):581(1964) and Kahlson, T. and Lindholm, S., Paperi Puu 48(10):583(1966).
- Cowan, W. F. and Cowdrey, E. J. K., Tappi 57(2):90(1974).
- van den Akker, J. A., Tappi 53(3):388(1970).
- Ionides, G. N. and Mithell, J. G., Paperi Puu 60(4a):233(1978).
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This page has been updated 31.03.2021
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