The efficiency of the electrostatic separation of granular plastics wastes depends on the electric charge acquired by the particles in appropriate tribocharging devices. The objective of the present study was the development and functional optimization of new tribocharger design consisting of an assembly of six cylinders, made of polyvinyl chloride (PVC), acryl-methyl butadiene styrene (ABS), or polycarbonate (PC) that can rotate at variable speed and be inclined at a certain angle with respect to the horizontal plane. The performances of the triboelectric charger were evaluated by measuring the charge per mass ratio of the granules collected at the outlet of the device. A first set of experiments involved eight granular polymers, size 2 to 6 mm, originating from waste electric and electronic equipment. The polymers could be arranged in a triboelectric series with respect to the amount of charge acquired in contact to the PVC, ABS, and PC cylinders. A second set of experiments was carried out with polystyrene granules and enabled the choice of the limits of variation of the two factors that were expected to affect the tribocharging: the inclination of the six-PVC-cylinder assembly and its rotation speed. Finally, design of experiments methodology was used for modeling and optimization of the process. The best results were obtained for high rotation speeds and low inclination angles.

中文翻译：

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新型旋转多筒型装置中颗粒塑料摩擦起电的影响因素


粒状塑料废物的静电分离效率取决于颗粒在适当的摩擦充电装置中获得的电荷。本研究的目的是开发和功能优化新型摩擦充电器设计，该设计由六个气缸组件组成，由聚氯乙烯 (PVC)、丙烯酰甲基丁二烯苯乙烯 (ABS) 或聚碳酸酯 (PC) 制成，可在可变速度并相对于水平面倾斜一定角度。通过测量在装置出口处收集的颗粒的电荷/质量比来评估摩擦带电充电器的性能。第一组实验涉及八种颗粒状聚合物，尺寸为 2 至 6 毫米，源自废弃电气和电子设备。聚合物可以根据与 PVC、ABS 和 PC 圆柱体接触时获得的电荷量排列成摩擦电系列。第二组实验是用聚苯乙烯颗粒进行的，并能够选择预计影响摩擦起电的两个因素的变化极限：六聚氯乙烯圆柱体组件的倾斜度及其旋转速度。最后，使用实验设计方法对过程进行建模和优化。在高旋转速度和低倾斜角度下获得了最佳结果。