Abstract
) have been exposed to repetitive daily and weekly step changes in relative humidity with the surrounding temperature at an approximate constant level. The results show that the moisture sorption is a two-step sorption process with the major change in moisture content in the first fast initial part. The major part of the moisture change happens within a relatively short period of time. No significant phase lag has been observed for neither transverse nor longitudinal specimens up to 10 mm thickness. The moisture change in absorption is slightly different from the moisture change in desorption. Curves in absorption and desorption for specimens with both transverse and longitudinal direction are rather similar in shape.
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