Abstract
The study focuses on the moisture buffering properties of paper plaster. Two questions are under consideration in this article. Firstly, how the paper used influences the properties (dry density, drying shrinkage) of paper plaster, and secondly, what the material sorption and moisture buffering properties of paper plaster are.Two different dry density sized groups of densities approx. 140–150 kg/m3 (glossy paper and egg cartons) and 240–250 kg/m3 (printer paper and newsprint). Shrinkage properties were 10–14% (in diameter) for printer paper, 3–4% for glossy paper and egg carton, and 5.6% for newsprint.The results of the tests carried out in a climate chamber show that paper plaster adsorbs water vapour well - more than clay plaster, which is often used as a good moisture buffering material. The maximum moisture content was 961 g/m2 and as a minimum of 726 g/m2. The moisture uptake rate was higher on the first day of RH change than on other days.Paper plaster is an outstanding water buffering material [2.11–2.99 g/(m2·%RH)] belonging to the moisture buffering class presented by Nordtest method as “excellent".The results demonstrate that the moisture buffering properties of paper plaster when different papers are used do not differ significantly. It means that all the paper materials used in the study can be used to make paper plaster. Therefore, sorting paper before making paper plaster is not necessary.
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