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Physical properties of cellulosic materials related to moisture changes
RISE, Innventia.
RISE, Innventia.
2016 (English)In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 50, no 1, 81-89 p.Article in journal (Refereed) Published
Abstract [en]

Moisture affects the mechanical properties of paper to a high degree. Moreover, the creep properties of paper may be highly affected while the relative humidity is changing, exhibiting mechano-sorptive creep. The reasons for the great sensitivity to moisture changes of papers are not fully explained. In this study, thin papers were examined during sorption processes and the moisture content within the paper, paper length and dynamic elastic modulus during RH changes were measured. It is demonstrated that the dimensional changes of the paper exactly reflected the changes in moisture content within the sample. During both absorption and desorption, the elastic modulus changed so that it was lower than the equilibrium value corresponding to its moisture content. This was especially evident during absorption where the modulus dropped below the equilibrium value at the end RH, i.e. the value was approached from below. The modulus drop was highly related to RH changes made at higher RH and could possibly be related to the softening of carbohydrates.

Place, publisher, year, edition, pages
2016. Vol. 50, no 1, 81-89 p.
Keyword [en]
Creep; Elastic moduli; Moisture determination, Absorption and desorptions; Cellulosic material; Creep properties; Dimensional changes; Dynamic elastic moduli; Equilibrium value; Mechanosorptive creep; Sorption process, Moisture
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-12627DOI: 10.1007/s00226-015-0777-xScopus ID: 2-s2.0-84952989381OAI: oai:DiVA.org:ri-12627DiVA: diva2:971118
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cited By 0

Available from: 2016-09-15 Created: 2016-09-15 Last updated: 2016-10-31Bibliographically approved

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