Hygroexpansivity of anisotropic sheets
Erkkilä, A.-L., Leppänen, T., Ora, M., Tuovinen, T., & Puurtinen, A. (2015). Hygroexpansivity of anisotropic sheets. Nordic Pulp and Paper Research Journal, 30(2), 325-334.
Julkaistu sarjassa
Nordic Pulp and Paper Research JournalPäivämäärä
2015Tekijänoikeudet
© Nordic Pulp & Paper Research Journal, 2015. Published in this repository with the kind permission of the publisher.
Dimensional instability, more particularly
its component hygroexpansivity, may cause problems in
process or end-use situations in which paper or board is
in contact with water or subject to changes in ambient
relative humidity. Misregistration in printing, curl during
copying and calender wrinkles are examples of such
defects. In this paper, the in-plane hygroexpansivity of
oriented laboratory sheets with different pulps and dried
both freely and under restraint is studied.
A linear relationship between the drying shrinkage and
hygroexpansion coefficient of freely dried laboratory
sheets having different fiber orientation anisotropies, was
observed. Regardless of both the measurement direction
(MD or CD) and the drying options (freely or restraint)
all hygroexpansion coefficient values of each pulp type
fell quite well on one single power curve as a function of
the elastic modulus. Fiber orientation is considered via
two different approaches: using fiber orientation
anisotropy and using directional variable named as
anisotropy index. When the anisotropy index is used, the
MD and CD hygroexpansivity or the MD and CD drying
shrinkage can be fit on a single curve, while the freely
dried and restraint-dried sheets evidently need two
different fitting curves. Between the hygroexpansion
coefficient and the anisotropy index, a simple power law
relationship, with two fitting parameters depending on
pulp and drying restraints, is introduced.
...
Julkaisija
Mid Sweden UniversityISSN Hae Julkaisufoorumista
0283-2631
Alkuperäislähde
http://www.npprj.se/html/main.asp?i=167&h=1&b=1&m=754Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/24748685
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