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INSTRUMENTATION OF RESPIRABLE DUST GENERATED IN WOOD PROCESSING AND ITS CLLECTION METHOD

木材加工过程中产生的呼吸性粉尘的检测及采集方法

基本信息

批准号：
08456086
负责人：
KITAYAMA Shigeru
金额：
$ 4.29万
依托单位：
TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

To investigate effects of sanding conditions on concentration of respirable wood dust and stock removal rate under belt sanding, the concentrations in wood under various conditions were measured using the respirable aerosol mass monitor, experimentally designed by the orthogonal array. We adopted grain size of coated abrasive, sanding condition, sanding time, sanding pressure and sanding direction as sanding conditions. Analysis of variance was used to examine the impacts in term of geometric mean, maximum and geometric standard deviations of measured concentrations, as well as stock removal rate. Stock removal rate was affected by grain size of coated abrasive, sanding pressure and sanding direction, but the respirable dust concentration was only influenced by sanding pressure, and linearly increased with increasing sanding pressure. Relationship between sanding pressure and geometric mean of respirable dust concentration could be expressed by the equation under the experimental conditions. On the other hand, the distribution of airborne dust in a woodworking chamber was measured. The shape of fine particles that fell onto a glass plate were also analyzed by an image analyzer, and the distribution of the diameter and other shape factors of the particles were estimated. The changes in the dust concentration in the diameter distribution with time were simulated by a numerical analysis which considered the drug due to friction between air and particles in free fall. The calculated density agreed favorably with the measured value. The effects of both the particle shape and the sanding conditions on the simulation were also clarified.

为研究砂带砂磨条件对木材呼吸性粉尘浓度和去除率的影响，采用正交试验设计的呼吸性气溶胶质量监测仪，测定了不同条件下木材中呼吸性粉尘浓度。我们采用涂附磨料粒度、砂光条件、砂光时间、砂光压力和砂光方向作为砂光条件。方差分析被用来检查的几何平均值，最大值和几何标准偏差的测量浓度，以及股票的去除率方面的影响。磨料去除率受磨料粒度、砂光压力和砂光方向的影响，而呼吸性粉尘浓度仅受砂光压力的影响，且随砂光压力的增大而线性增大。在实验条件下，砂压与呼吸性粉尘浓度几何平均值的关系可用该方程表示。另一方面，测量了木工室中的气载粉尘的分布。还通过图像分析仪分析落在玻璃板上的细颗粒的形状，并估计颗粒的直径和其它形状因子的分布。通过数值分析，模拟了粉尘浓度在粒径分布中随时间的变化，考虑了药物在自由落体过程中与空气的摩擦作用。密度计算值与实测值吻合较好。颗粒形状和砂磨条件对模拟的影响也被澄清。