工业静电控制

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Fraser Static China

Static Electricity

静电的测量

检测静电的等级是非常重要的。它能让您查看是否存在静电,其大小和产生的位置。Fraser 静电检测仪简单易用,在分析潜在的静电问题时非常有用。测量静电时,遵守操作说明是很重要的。电场的性质非常独特,必须加以理解。在测量电荷时,电场的最有趣的特性之一也是非常重要的特性,如上图所示,就是电场:电(库仑)力作用的空间区域。每个带电的物体都被电场包围着。磁力线垂直于材料,显示力作用的方向。它可以与用于测量和中和电荷产生重要影响的其他物体相互作用。例如,当带电材料通过辊筒时,电荷与辊筒耦合,并似乎消失。在辊筒附近精确测量是不可能的。当材料离开辊筒时,电场会“重新回来”,所以静电可以再次被检测到。

 

Static Electricity

How is Static Generated? The main causes of static electricity are: Contact & Separation between two materials – including friction, travelling over rollers etc. Rapid heat change e.g. material going through an oven, or polymers during injection moulding. High energy radiation, UV, X-ray, intense electric fields. Cutting action e.g on slitter-rewinders, sheet cutters, machining of plastics. Induction – standing in the electric field generated by a static charge or handling charged products and materials. Contact and separation is probably the most common cause of static in industry where film and sheet are being processed. It happens when material unwinds or passes over a roller. When the material touches the roller a small charge flows from the material to the roller causing an imbalance. As the material leaves the roller the voltage is magnified like the separating plates of a capacitor. The size of the resultant voltage is limited in practice by the breakdown strength of the surrounding materials, surface conduction etc. You often hear small cracks, or static discharges, as the material leaves the roller. This is where the static has reached the breakdown strength of the surrounding air. The plastic film is neutral before the roller, but as the film separates from the roller electrons flow onto the film giving it a negative charge. The remaining positive charge on the roller will disappear quickly if it is an earthed metal roller.

Shanghai Fraser Static Technology Co. Ltd

上海孚蕊哲静电科技有限公司
上海市顾戴路2568号
3号楼301室

Fraser Static China Fraser CN Fraser China

Fraser Anti-Static Techniques UK
Scotts Business Park
Bampton, Devon
UK – EX16 9DN

Fraser Anti Static UK Fraser UK Fraser Anti-Static UK

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