Bekhta Pavlo, Kozak Ruslan, Sedliačik Ján, Gryc Vladimír, Sebera Václav, Bajzová Liubov, Iždinský Ján
Department of Wood-Based Composites, Cellulose, and Paper, Ukrainian National Forestry University, 79057 Lviv, Ukraine.
Department of Wood Science and Technology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemědělská 3, 613 00 Brno, Czech Republic.
Materials (Basel). 2022 Sep 18;15(18):6474. doi: 10.3390/ma15186474.
The aim of this study was to improve the properties of lightweight particleboards by their veneering. The industrially produced wood particles, rotary-cut birch veneer, expanded polystyrene (EPS) granules and urea-formaldehyde (UF) resin were used to manufacture non-veneered and veneered boards in laboratory conditions. The boards were manufactured with different densities of 350, 450 and 550 kg/m and with various levels of EPS content 4, 7 and 10%. Boards without EPS granules as the reference were also manufactured. Bending strength (MOR), modulus of elasticity in bending (MOE), internal bond (IB) strength, thickness swelling (TS) and water absorption (WA) of lightweight particleboards were determined. This study confirmed that veneering of lightweight particleboards by birch veneer improved mechanical properties significantly. The MOR and MOE of veneered boards throughout the whole density range of 350-550 kg/m meet the requirements of the CEN/TS 16368 for lightweight particleboards types LP1 and LP2. The IB strength of veneered boards only with density of 550 kg/m meets the requirements of CEN/TS 16368 (type LP1). The MOR, MOE and IB of non-veneered boards also meet the requirements of CEN/TS 16368 (type LP1) except boards with density of 350 kg/m for MOR and MOE, and except densities of 350 and 450 kg/m for IB.
本研究的目的是通过单板 veneering 来改善轻质刨花板的性能。在实验室条件下，使用工业生产的木材颗粒、旋切桦木单板、膨胀聚苯乙烯（EPS）颗粒和脲醛（UF）树脂来制造无单板和有单板的板材。板材制造时密度分别为350、450和550 kg/m³，EPS含量分别为4%、7%和10%。还制造了无EPS颗粒的板材作为参考。测定了轻质刨花板的抗弯强度（MOR）、抗弯弹性模量（MOE）、内结合强度（IB）、厚度膨胀率（TS）和吸水率（WA）。本研究证实，用桦木单板对轻质刨花板进行 veneering 可显著提高其力学性能。在350 - 550 kg/m³的整个密度范围内，有单板板材的MOR和MOE符合CEN/TS 16368对LP1和LP2型轻质刨花板的要求。仅密度为550 kg/m³的有单板板材的IB强度符合CEN/TS 16368（LP1型）的要求。无单板板材的MOR、MOE和IB也符合CEN/TS 16368（LP1型）的要求，但密度为350 kg/m³的板材的MOR和MOE以及密度为350和450 kg/m³的板材的IB除外。 注：这里的“veneering”在中文里可能没有完全对应的准确术语，根据语境大致推测是类似单板处理之类的意思，但不确定原文中这个词具体准确的专业含义，所以保留英文未翻译。
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