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Legal regulations on anti-static fabrics

Legal regulations on anti-static fabrics Performance test Organic conductive fiber in removing static electricity Workwear fabrics and general civilian fabrics have played an effec…

Legal regulations on anti-static fabrics

Performance test

Organic conductive fiber in removing static electricity Workwear fabrics and general civilian fabrics have played an effective role in removing static electricity. However, compared with conventional fabrics, the electrostatic performance testing of fabrics containing conductive fibers has significantly deteriorated in accuracy and attention. Choosing reasonable testing methods and correctly evaluating the electrostatic properties of conductive fiber-containing fabrics are basic work necessary to conduct in-depth research on the finishing technology of organic conductive fibers, the production process of conductive fiber-containing fabrics, and to guide the rational application of such fabrics. We analyze the adaptability of my country’s current relevant test method standards to the antistatic performance testing of fabrics containing conductive fibers.

Technical Specifications

Static electricity testing includes testing of dangerous static power parameters, materials and Testing of electrostatic properties of products and testing of electrostatic sensitivity of flammable and explosive items. The main parameters that characterize the electrostatic properties of materials and products include resistivity, leakage resistance, charge area density and half-life, frictional charging voltage and half-life, etc. The evaluation of the electrostatic properties of fabric materials includes resistance indicators (volume specific resistance, mass specific resistance, surface specific resistance, leakage resistance, inter-electrode equivalent resistance, etc.), electrostatic voltage and its half-life, charge area density and other indicators, as well as ash absorption test Low-precision indicators obtained by simple test methods such as , Zhangfan test, and adsorbed metal sheet test. Among the current national standards and industry standards of the fabric industry in my country, the product standards related to the antistatic function of fabrics are: GB/T 12014-2009 Anti-static workwear: The test method standards related to the electrostatic performance of fabrics are: GB 12703-1991 Fabrics Product electrostatic testing method; FZ/T 01042-1996 Determination of electrostatic properties of fabric materials and electrostatic voltage half-life (replacing FJ 549-1985); FZ/T 01044-1996 Determination of electrostatic properties of fabric materials and fiber leakage resistance (replacing FJ 551-1985) ; FZ/T 01059-1999 Method for determination of frictional electrostatic adsorption of fabrics (replacing ZB W 04007-1989); FZ/T 01060-1999 Method for determination of triboelectric charge density of fabrics (replacement of ZB W 04008-1989); FZ/T 01061- 1999 Method for determination of triboelectric voltage of fabrics (replacing ZB W 04009-1989); the above current standards are particularly similar to ISO, AATCC, ASTM, BS, JIS, DN and other similar standards. Among them, GB/T12014-1989 is basically equivalent to JIS T 8118 “Static Air Charge Preventive Clothing” (1983); GB/T12703-1991 refers to and adopts JISL 1094 “Test Method for Object and Object Charge Performance” (1988). AATCC76-1995 Fabric antistatic test and inspection method. 2. Adaptability analysis of my country’s current test method standards GB/T 12703-1991 Static electricity test method for fabrics provides 6 test methods: Method A (half-life method): Use +10kV high voltage to test on an optional metal platform Discharge the sample for 30 seconds and measure the half-life (s) of the induced voltage. FZ/T 01042-1996 “Fabric materials – Electrostatic properties – Determination of electrostatic high voltage half-life” is exactly the same. This method can be used to evaluate the electrostatic lifetime characteristics of fabrics, but the contact state of the conductive fiber-containing sample on the grounded metal platform cannot be controlled. The charge leaks quickly when the conductive fiber and the platform are in good contact, and when the contact is poor, its attenuation rate is the same as the general The fabrics are similar, and the test results obtained by the same sample under different placement conditions vary greatly, so it is not suitable for the evaluation of fabrics containing conductive fibers. Japan’s JISL 1094 “Testing method for electrification performance of objects and objects” revised in 1997. Specific provisions have been made in the text stating that this method is not suitable for evaluating the antistatic properties of fabrics containing conductive fibers. Method B (frictional electrification voltage method): Samples (4 pieces, 2 warp, 2 weft, size 4cm × 8cm) are clamped on the drum, and the drum rotates at 400r/min and standard cloth (nylon or polypropylene) ) friction, test the maximum charged voltage (V) of the sample within 1 minute. Except for slight differences in abrasive specifications, number of sub-samples, etc., FZ/T 01061-1999 “Determination Method of Fabric Triboelectric Voltage” is the same. This method is not suitable for fabrics embedded with conductive fibers because the size of the sample is too small. The distribution of conductive fibers will vary greatly depending on the sampling location, so it is also suitable for testing and evaluating the antistatic properties of fabrics containing conductive fibers. Method C (charge surface density method): After the sample is rubbed with nylon standard cloth in a specific way under specified conditions, the charge amount is measured using a Faraday cylinder, and the charge surface density (μC/m2) is calculated based on the sample size. Except in MoroccoExcept for slight changes in wiping cloth specifications, sample pretreatment, friction rod diameter, number of frictions, etc., FZ/T 01061-1999 “Method for Determination of Point Charge Density by Fabric Friction” is the same. The charge surface density method is suitable for evaluating the ease with which various fabrics, including fabrics containing conductive fibers, accumulate static electricity through friction. The measured results are closely related to the degree of dust absorption of the sample. Since the frictional electrification between the sample and the standard cloth is achieved by manual operation, the consistency of the test conditions, the accuracy and reproducibility of the test results are easily affected by the operating techniques. Method D (Method of charging amount of clothing when taking off clothes): Rub work clothes and chemical fiber underwear in a specific way, take off the work clothes, put them into a Faraday cylinder, and calculate the charge amount (μC/piece). The test objects of this method are limited to work clothes, and the material of underwear is not specified, and the friction method is difficult to be consistent, so there is a lack of comparability. E method (work clothes friction charge method): Use a standard drum drying device (45r/min or more) lined with nylon or polypropylene to frictionally electrify the work clothes sample for 15 minutes, put the Faraday cylinder into the work clothes and measure the charge amount of the work clothes (μC /piece). This method is basically consistent with the charge measurement method stipulated in the “static workwear” product standard GB/T 12014-2009, and is suitable for testing the frictional charge amount of workwear; its technical essence is also consistent with the C method (charge surface density method) consistent. F method (inter-electrode equivalent resistance method): The fabric sample is in good contact with the grounded conductive offset plate. Special electrodes are clamped on the sample according to the specified spacing and pressure. After short-circuit discharge, voltage is applied, and the inter-electrode gap is calculated based on the current value. Equivalent resistance (Ω). When the fabric containing conductive fibers comes into contact with the conductive rubber plate, it will cause a short circuit between the local areas where the conductive fibers are exposed, making it difficult to measure the true equivalent resistance. FZ/T 01044-1996 “Fabric Materials – Electrostatic Properties – Determination of Fiber Leakage Resistance” and other resistance test methods mainly detect fibers. FZ/T 01059-1999 “Method for determination of frictional electrostatic adsorption of fabrics”: Rub the fabric in a prescribed method and then adsorb it to a metal inclined surface. The antistatic properties of the fabric are evaluated based on the adsorption time. This method has simple equipment and is suitable for reflecting the degree of static electricity adsorption of clothing fabrics to limbs. However, the test results are greatly affected by the operating techniques, so it is a simple test method. For fabric samples containing conductive fibers, the uncertainty in the contact state of the metal with the exposed conductive fibers will also lead to instability in the test results. GB 12014-2009, which came into effect on December 1, 2009, replaced GB 12014-1989 and became the new national standard for anti-static clothing.



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