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HYGROSCOPIC PROPERTIES OF THERMALLY POST-TREATED OSB

机译：热处理后OSB的吸湿性

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OSB (oriented strandboards) made from Scots pine (Pinus sylvestris) were thermally post-treated at three different maximum treatment temperatures in the laboratory thermal treatment chamber of the Institute for Wood Technology Dresden (IHD). The OSB were supplied by a European manufacturer of OSB and bonded with methylene diphenyl diisocyanate (MDI). Post-treatment means that rather than thermally treating wood or strands before panel production, cut industry panels, i. e. 650mmx1200mm, were modified in IHD’s lab kiln. The main goals of the thermal post-treatment of full-sized OSB were to improve the hygroscopic properties, i. e. to reduce the thickness swell (TS) and the equilibrium moisture content (EMC), as well as to improve the long-term properties creep behaviour and dimensional stability, without significantly reducing further mechanical properties like e. g. internal bond (IB) or bending properties, however. It was observed that the thermal post-treatment of the aforementioned OSB had a very positive effect on the moisture-related properties TS and EMC. The modified OSB showed far better values for said properties than the respective untreated ones. In can be concluded, that the thermal modification of OSB panels is possible and leads to very positive effects regarding their hygroscopic properties.
机译：在德累斯顿木材技术研究所（IHD）的实验室热处理室内，对由苏格兰松树（Pinus sylvestris）制成的OSB（定向刨花板）进行了三种不同的最高处理温度的热处理。 OSB由欧洲OSB制造商提供，并与亚甲基二苯基二异氰酸酯（MDI）结合。后处理意味着在生产面板之前，不对木材或木条进行热处理，而是切割工业面板。 e。 650mmx1200mm，在IHD的实验室窑炉中进行了修改。全尺寸OSB热后处理的主要目标是改善吸湿性，即e。降低厚度溶胀（TS）和平衡水分含量（EMC），以及改善长期性能的蠕变行为和尺寸稳定性，而不会显着降低其他机械性能，例如e。 G。内部粘结（IB）或弯曲性能。观察到，上述OSB的热后处理对与水分相关的特性TS和EMC具有非常积极的影响。改性的OSB显示出比相应的未处理的更好的上述性能值。可以得出结论，OSB面板的热改性是可能的，并导致有关其吸湿性的非常积极的影响。

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