Analysis of frictional static voltage
anti-static dust-proof fabrics (commonly known as conductive silk) commonly used in anti-static clothing in microelectronics, precision instruments and pharmaceutical industries, using special polyester filaments and high-performance permanent conductive fibers (produced by Nippon Textile Co., Ltd. or Japan Kuraray Co., Ltd.) It is made by a special process and has excellent long-lasting anti-static and dustproof function, which can effectively release the static charge of the human body.
At present, companies (factories) that have strict antistatic requirements have the requirements of the triboelectric voltage value in addition to the point-to-point resistance of the antistatic clothing.
The test is based on the standard [GB12014-2009 anti-static clothing] [SJ/T 10694-2006 general specification for anti-static testing of electronic product manufacturing and application systems] and other relevant national standards. Among them, the point-to-point resistance test method, whether it is a conductive silk manufacturer or an anti-static clothing manufacturer or user, can reach a consensus on the basis of national standards, basically without any objection. However, the frictional electrification, whether it is the test method or the requirements of the voltage value, has some requirements and regulations of its own enterprise. This is generally determined by the company according to its own technical conditions and product standards, usually called enterprise standards. For example, KDDI Japan's requirement for electrostatic voltage generation in a product manufacturing environment is less than 100 volts. Huawei also requires antistatic products from its suppliers to have an electrostatic voltage of less than 100V.
Generally, the anti-static clothing made of conductive silk should have a friction voltage of 350-1000 volts. The only way to control the frictional static voltage of this antistatic suit below 100V is to change the surface resistance of the polyester material in the fabric. For example, replace the polyester with a natural absorbent fiber (cotton) or modify the polyester (by chemical means, add a chemical to clean the clothes). The friction static voltage value of the conductive silk cannot be controlled to be less than 100 V by merely increasing the amount of the conductive wire or reducing the electrical resistance of the conductive wire. From the analysis of the conductive silk material, if the conductive silk material is not treated, it is necessary to keep the friction static voltage value at a very low level (such as below 100V), and the current technical water is still difficult to achieve.