ABSTRACT

During machining, wood particles are generated, released, and accelerated at high speed. Wood dust is known to be unpleasant, causing technical problems, but bears also considerable health risks. Wood dust consists of fractured tissues and has a high, irregularly structured surface due to tiny hooks formed by abundant sticking out fibrillar fragments. Targeting at a novel approach for dust reduction, this communication investigates triboelectric charging of wood particles upon cutting of wood samples using a hand-guided miter saw. The impact of wood species, number of saw blade teeth, cutting direction, and wood moisture, on electric field strength levels and polarity of generated wood particles were measured, using a electrostatic detection apparatus. The generated wood particles have shown accumulated triboelectric charging, as indicated by electric field strengths, which varied between −4 and +10 V m⁻¹. The intensity of the charge transfer was inversely proportional to the moisture content, especially when cut cross-sectionally. Highest field strengths were observed for beech, cut perpendicular to grain. Even though being a highly undesired effect, triboelectric charging of wood bears a novel opportunity for reducing the current dust burden in home and industrial wood processing environments, which is subject of ongoing and future research.

摘要

在加工过程中，木材颗粒会高速生成，释放和加速。已知木屑令人不快，引起技术问题，但也带来相当大的健康风险。木粉尘由破裂的组织组成，并且由于大量伸出的原纤维碎片而形成的细小钩子，具有较高的，不规则结构的表面。该通讯针对一种新颖的降尘方法，研究了使用手动斜切锯切割木材样品后木材颗粒的摩擦带电现象。使用静电检测设备测量了木材种类，锯片齿数，切割方向和木材水分对电场强度水平和生成的木材颗粒极性的影响。产生的木材颗粒显示出累积的摩擦带电，^-1。电荷转移的强度与水分含量成反比，尤其是在横截面切割时。观察到垂直于谷物切割的山毛榉的最高场强。尽管这是非常不希望的效果，但是木材的摩擦带电仍为减少家庭和工业木材加工环境中的当前粉尘负担提供了新的机会，这是正在进行和未来研究的主题。