| Based on the former research, this article presents the suitable weaving parameters for the development of electromagnetic radiation worsted fabrics by using three kinds of radiation prevention of fabrics processing methods:interwoven fabric, doubling twist fabric and core-spun yarn fabric from the electromagnetic radiation mechanism and the theory of preventing electromagnetic radiation. Also tests the yarn and fabric properties, which aims to provide the reference for the enterprise to design and develop similar products.According to the different influence factors of fabric resist radiation performance, reasonable schemes are made in this experiment with a series of analysis and discussion. The study found, as for the interwoven fabric, the best SE can reach to 47.60dB in warp direction and 42.63dB in weft direction when the wool and silver filament arrangement ratio is 1:2 and fabric tightness is 73.52%; as for the doubling twist yarn fabric, the best SE can reach to 59.51dB in warp direction and 56.64dB in weft direction when the wool and filament blending ratio is 1:1, namely linear density is 41 tex, twist factor is 130 and fabric tightness is 80%; as for the core-spun yam fabric, the best SE can reach to 50.02dB in warp direction and 46.46dB dB in weft direction when the linear density is 21 tex, twist factor is 130 and fabric tightness is 90%.Results show that linear density, namely the silver filament yam content is the main effect factor for the yam property and fabric electromagnetic shielding effectiveness, and fabric tightness is also an important factor, while twist factor is not obvious; With the increase of fabric tightness, the resistance of the interwoven fabric and doubling twinst yarn fabric reduce gradually and fabric shielding effectiveness increase gradually, when fabric tightness increases to certain degree, both basic be more stable,while the core-spun fabric shielding effectiveness decreased gradually; Under the same degree of doubling twisted yarn fabric tightness and silver filament content, fabric resistance change is not evident and electromagnetic shielding effectiveness gradually decreased with the increase of the linear density, while the core-spun fabric shielding effectiveness decreased gradually.Yarn and fabric resistances with silver-plated filament drop more dozens of orders of magnitude than pure wool, their conductivity are enhanced obviously; But the yam resistance, fabric resistance and fabric electromagnetic shielding effectiveness is not always in direct proportion, which is also related to fabric structure and guide magnetic.No matter the interwoven fabric, doubling twinst fabric, or spun-core fabric, the electromagnetic shielding effectiveness in warp direction is superior to weft direction, owing to the yam arrangement density; The shielding effectiveness of three kinds of fabrics decrease with electromagnetic wave frequency both warp direction and weft direction.Although the silver filament content of the core-spun fabric is much less than that of the doubling twinst fabric, both have the same shielding effectiveness. That is, the shielding effectiveness of the core-spun fabric is superior to the doubling twinst fabric and interwoven fabric. Instead of the doubling twinst fabric and interwoven fabric, the core-spun fabric not only avoid the fabric appearance by silver ions restrictions, and save the costs, also can achieve higher resistance to radiation effect. |
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