Dukarska Dorota, Rogoziński Tomasz, Antov Petar, Kristak Lubos, Kmieciak Jakub
Department of Mechanical Wood Technology, Poznań University of Life Sciences, 60-627 Poznań, Poland.
Department of Furniture Design, Poznań University of Life Sciences, 60-627 Poznań, Poland.
Materials (Basel). 2021 Dec 22;15(1):48. doi: 10.3390/ma15010048.
The properties of particleboards and the course of their manufacturing process depend on the characteristics of wood particles, their degree of fineness, geometry, and moisture content. This research work aims to investigate the physical properties of wood particles used in the particleboard production in dependence on their moisture content. Two types of particles currently used in the production of three-layer particleboards, i.e., microparticles (MP) for the outer layers of particleboards and particles for the core layers (PCL), were used in the study. The particles with a moisture content of 0.55%, 3.5%, 7%, 10%, 15%, and 20% were tested for their poured bulk density (ρp), tapped bulk density (ρt), compression ratio (), angle of repose (αR), and slippery angle of repose (αs). It was found that irrespective of the fineness of the particles, an increase in their moisture content caused an increase in the angle of repose and slippery angle of repose and an increase in poured and tapped bulk density, while for PCL, the biggest changes in bulk density occurred in the range up to 15% of moisture content, and for MP in the range above 7% of moisture content, respectively. An increase in the moisture content of PCL in the range studied results in a significant increase in the compression ratio from 47.1% to 66.7%. The compression ratio of MP increases only up to 15% of their moisture content-a change of value from 47.1% to 58.7%.
刨花板的性能及其制造过程取决于木刨花的特性、细度、几何形状和含水量。本研究旨在探讨刨花板生产中使用的木刨花的物理性能与其含水量的关系。研究使用了目前用于生产三层刨花板的两种刨花，即刨花板外层的微粒（MP）和芯层的刨花（PCL）。对含水量为0.55%、3.5%、7%、10%、15%和20%的刨花进行了堆积密度（ρp）、振实密度（ρt）、压缩比、休止角（αR）和滑动休止角（αs）测试。结果发现，无论刨花的细度如何，其含水量增加都会导致休止角和滑动休止角增大，堆积密度和振实密度增加，而对于PCL，堆积密度的最大变化发生在含水量高达15%的范围内，对于MP则分别发生在含水量高于7%的范围内。在所研究的含水量范围内，PCL含水量增加会导致压缩比从47.1%显著增加到66.7%。MP的压缩比仅在含水量达到15%时增加，值从47.1%变化到58.7%。
