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《Journal of Forestry Engineering》 2018-01
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Size and shape distribution of particles from particleboard drilling based on image analysis

XING Cheng;DING Tao;LI Zhi;GAO Yijun;WEN Liang;ZHANG Chen;College of Materials Science and Engineering,Nanjing Forestry University;  
Panel drilling is a key operation in the manufacturing of particleboard furniture. The dust emitted from this process is hard to collect due to the absence of dust collecting hood in the machine,resulting in the increased environmental concerns. In this study,the size and shape distribution of dust emitted from particleboard drilling was investigated by image analysis,and their effect on dust flowability was discussed. We aimed at providing the efficient dust collecting with data supports. The results showed that the dust sizes emitted from the drilling process were widely distributed. But most ISO area diameters of the particles were below100 μm,making them fall into the category of total suspended particulates( TSP). The TSP can stay longer in the air and travel in a wider space,which is considered harmful to human health. The distribution of the aspect ratio,roundness and convexity showed that the dust shape changed significantly with the size change. The bigger particles exhibited more irregularity,while the smaller ones presented more homogeneous shape. This pattern was established by the collision and erosion among the particles during their generation and removal from the cutter and transmission in the air. With respect to dust collecting and conveying,bigger particles tended to interlock with each other,making them hard to move and leaving many voids between them. The smaller particles were easy to agglomerate although their regular shape indicated a good flowability. Besides,when falling into the inter-particle voids,their flowability was further restricted by the surrounding walls. It was therefore concluded that the overall flowability of the dust emitted from particleboard drilling was poor.
【Fund】: 国家重点研发计划(2016YFD0600703-3);; 大学生创新训练计划项目(201510298038Z)
【CateGory Index】: TS653.5
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