The Test And Analysis Of Anti-microwave Performance Of Woven Fabric Embedding Metal Fiber

With the research and develop of anti-microwave cloths, the market demand of thiskind textile were significantly increased. However, the specific test and evaluation systemcan not meet the further develop of market with regulation. In order to protect health andsafety of consumers and standardize the market, this paper investigated the anti-microwaveperformance of the existing anti-microwave cloths in market; the fabric embeddingstainless steel filament in different space by hand; the weaving textile embedded twistedyarn made by stainless steel filament and cotton yarn (twisted yarn); the weaving textileembedded blended yard made by stainless steel staple fiber and cotton fiber (blended yarn).This paper analyzed the relationship between shielding efficiency and embedded density,test angles, test frequency. The test result may offer some theoretical reference to thedesign and test standard of anti-microwave textiles.The subject outlined the concept and hazard of the microwave in brief, analyzed theshielding principle of the anti-microwave textile, introduces the research situation ofanti-microwave technology at home and abroad. On the basic research of the currentsituation at home and abroad, through testing the shielding effect of the anti-microwavecloths in different form selected from market, the test result suggestes that the fabric madeby100%silvering-cated fiber has the highest shielding efficiency, the fabric containing25%stainless steel filament and fibric containing copper nickel metal ion have decreasingshielding efficiency. All the three kind fabrics have slowly droped shielding efficiencywith the growing test frequency from2250MHz to2650MHz.This paper investigaes the samples embedded twisted yarn and blended yarn indifferent space and angles, the anti-microwave performance was increasing through thedecrease of the embedded space, when the embedded space was1mm, the shieldingefficiency was30dB, achieve the top shielding effectiveness. This paper compared theregular in embedded stainless steel filament, silver filament and copper filament when thetest angle changing from0°to180°, the shielding efficiency of the three samples has aparabolic trend; the shielding effect reached its maximum when the test angle was90°.Thetest results of the sample can provide a foundation for production design.The twisted yarn and blended yarn were embedded as weft density, the linear densityof twisted yarn is24Tex, and it of blended yard is16.5Tex. The stainless steel weightpercentage of the two yarns is25%, weaving in different embedded weft density. Testingthe anti-microwave performance of the textiles in different angles and frequency, analyzes the relationship between the weft density and the shielding efficiency, it is concluded thatshielding efficiency is increasing through the increasing embedded weft density. When theembedded weft density of rope wire reached138/10cm, the shielding effect reached itsmaximum40dB; when the embedded weft density of blended yard reached100/10cm, theshielding effect reached its maximum31dB. Show that in the same condition; theanti-microwave performance of the textile of embedded stainless steel filament was betterthan embedded stainless steel staple fiber, because for the electic conductivity, staple fiberwas worse than filament, so its anti-microwave performace was worse than it of textileembedded filament. Through test the anti-microwave in different test frequency, theshielding effect of embedded filament and staple both were reduce with the test frequencywas increasing, with the test frequency was increasing, its wavelength was reduce, itscapacity of penetrating textile will be increased, so its shielding effect will be decline.According to test the anti-microwave of the textile embedded in one-way with stainlesssteel filament, silver filament and copper wire in different test angles, the shielding effectof the three textile all have a parabolic trend when test angles changed from0°to180°.When the warp and weft was added stainless steel filament at same time, the shieldingefficiency was fluctuates in2-3dB with the change of the test angles, so the impact of testangle was not very obvious.