The purpose of this paper was to analyze the effects of various OSB-strand modifications on physical and mechanical properties of strand board. Norway spruce (Picea abies L. Karst) strands were acetylated using acetic anhydride or thermally modified at 180 °C using atmospheric pressure and superheated steam environment. Strand boards made of acetylated strands (Acet), thermally modified strands (TM) and thermally modified strands used only at surface layers (TM_SL) were produced. Furthermore, strand boards with 20% (Cork_20%) and 40% (Cork_40%) cork particles were manufactured. Wood-water relations, i.e., equilibrium moisture content (EMC), water absorption (WA), thickness swelling (TS), as well as mechanical properties, i.e., bending strength and internal bonding, were tested and compared to untreated reference strand board. The EMC for TM_SL was no different than the reference boards, however, the other boards had a statistically significant decrease in EMC. Acetylated strand board and boards with cork particles had a significant increase in water resistance. The mechanical properties decreased for TM and Cork_40%, but no difference was shown for Cork_20%. Acetylation increased internal bond strength. The results provide a comparison between different modifications of strand boards and show a new possibility of reducing the water effects on OSB with cork particles.

中文翻译：

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化学和热改性以及材料替代对刨花板性能的影响

本文的目的是分析各种OSB链变种对刨花板物理和机械性能的影响。挪威云杉（Picea abies L. Karst）线束使用乙酸酐进行乙酰化处理，或在大气压和过热蒸汽环境下于180°C进行热改性。制备了由乙酰化股线（Acet），热改性股线（TM）和仅在表面层使用的热改性股线（TM _SL）制成的股板。此外，具有20％（软木_20％）和40％（软木_40％）制造了软木颗粒。测试了木材与水的关系，即平衡水分含量（EMC），吸水率（WA），厚度膨胀率（TS）以及机械性能，即弯曲强度和内部粘合力，并将其与未处理的参考刨花板进行了比较。TM _SL的EMC与参考板没有什么不同，但是其他板的EMC统计上显着下降。乙酰化的刨花板和带有软木颗粒的板的耐水性显着提高。TM和_40％的软木的机械性能下降，但_20％的软木的机械性能无差异。乙酰化提高了内部结合强度。结果提供了不同的刨花板修改之间的比较，并显示了减少软木颗粒对OSB的水影响的新可能性。