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Table 5. Appropriate Statistical Significances of Differences in Fig. 5 T = 20°C, RH = 65%, Absorption T = 20°C, RH = 85% T = 20°C, RH = 65%, Desorption R A B R A B R A B R s. s. R n.s. s. R n.s. s. A s. s. A n.s. s. A n.s. s. B s. s. B s. s. B s. s. Note: s. = statistically significant, n.s. = not significant, and α = 0. 05 In comparison with commercially produced particleboards, non-recoverable thickness changes of produced boards reached relatively high values. This was explained bythe material used. From the authors’ previous study it is already known that boards produced from after harvest remains reached non-recoverable thickness changes higher than 30% (Hýsek HWDO 2018). It was concluded that the plasma treatment of the particles had a statistically significant effect on the equilibrium moisture content of the boards and their thickness swelling; however, the thickness swelling values were negatively affected by the different average densities of the boards. In contrast, when non-recoverable changes were compared with the bending strength results, it can be assumed that modification A was the better level of plasma pre-treatment for the purpose of this study. These boards reached lower non-recoverable thickness changes as well as higher bending strength. Therefore, it was assumed that the lower level of plasma modification caused better adhesion, in comparison to the more aggressive modification B.
10 15 20 25 30 35 40 45 50 55 60
Board type R Board type A Board type B
0 5
65a
85
65d
0d
Relative humidity (%)
Fig. 6. Graph of the dependency of thickness swelling on relative humidity, a = absorption, d = desorption
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Hýsek et al . (2018). “Cold plasma & straw board,” B io R esources 13(3), 5065-5079.
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