Effect of humidity and viscoelastic behaviour of paper and board Paper and board are hygroscopic materials. They absorb moisture in humid conditions. In use, they may lose a considerable part of their strength. Strength values obtained under standard laboratory conditions of 23 °C and 50 % RH are, therefore, not necessarily a reliable measure of
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Effect of humidity and viscoelastic behaviour of paper and board
After reading this article you will..
- understand that moisture changes effect all papers and boards.
- know that a long-lasting static load can crush the package even though it is smaller than the strength of the board
- understand that a laboratory test made under certain conditions may not tell how well the paper and board will perform in actual climate conditions.
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:
Matti Kainulainen, Liva Söderhjelm
Based on: Kainulainen, M. & Söderhjelm, L. End-use properties of packaging papers and boards (Chapter 10). In: Levlin, J-E. & Sjöderhelm, L. (ed), Pulp and paper testing (Book 17), Papermaking Science and Technology. Jyväskylä. 1999. Fapet Oy. pp. 217-231.
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This page has been updated 26.03.2021
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