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Effect of Temperature and Humidity on Fiber Textile Properties
2018-10-09
 
1. Temperature influence Cotton wax is a mixture of alcohols, fats and gums. When the temperature is lower than 18.3 °C, the cotton wax is in a hardened state, the lubricating effect is lowered, the drafting resistance is increased, and the spinning process is affected. After the temperature is higher than 18.3 ° C, the cotton wax begins to soften, the fiber is soft and soft, and the spinnability is enhanced. When the temperature exceeds 27 ° C, the cotton wax begins to melt and become sticky, which is also disadvantageous for spinning. Generally speaking, the temperature is between 19 and -27 ° C, and the cotton wax is softened and not sticky, and is easily separated into single fibers, which is advantageous for removing impurities and drafting, and is easy to be spun into high-quality sliver cotton yarn.
The properties of synthetic fibers are different from those of raw cotton, which is hard when the temperature is low. When the fiber passes through the skin roller and the apron, it is easy to slip and increase the breakage. When the temperature is high, the antistatic agent is easily volatilized, so that the electrostatic effect is strengthened and the spinning is difficult. Therefore, the temperature control requirements of synthetic fibers are stricter than those of pure cotton.
 
2. The effect of relative humidity:
(1) Relative humidity and friction coefficient: Friction occurs in the relative movement. Friction is proportional to the coefficient of friction, and the coefficient of friction is related to factors such as material type and relative humidity of the air. As shown in Fig. 1, when the relative humidity is too large, the friction coefficient of the cotton yarn and the steel member is increased, so that the wear and fly-off phenomenon of the wire ring is increased, and the drafting and breaking are affected.
(2) Relative humidity and impurity removal: When the moisture regain of raw cotton or cotton lap is too high, the cotton lump is not easy to open and difficult to remove; when the moisture regain is too low, the cotton fiber is easily broken and the strength is decreased; the short velvet is increased. Only when the relative humidity control is appropriate can the moisture regain of the semi-products be normal and a better impurity removal effect can be obtained.
(3) Influence of relative humidity on the performance of the top roller The proper holding force between the top roller and the fiber during the spinning process. When the relative humidity is too high, the friction between the fiber and the roller and the skin is increased, thereby causing a phenomenon of winding the roller and the roller, which affects the production. Therefore, when changing the roller in actual operation, it should be stored in the workshop for a certain period of time, so that it can adapt to the temperature and humidity of the workshop, prevent the surface from condensing, and reduce the phenomenon of “three windings”.
(4) Humidity and fiber strength relationship After the relative humidity is increased, the long-chain molecules of cotton can be arranged neatly and strongly. However, when the relative humidity is increased, the sliding movement of the long-chain molecules is intensified, so that the fiber strength is affected. Therefore, the strength of cotton fiber does not increase linearly with the relative humidity; the viscose fiber is different, the lower the relative humidity, the higher the strength.
(5) Humidity and static electricity: During the textile process, the fiber and the machine parts, the fiber and the fiber or the mechanical parts and the machine parts rub each other to generate static electricity, and the static electricity causes the fiber and the surface of the machine to have different electric charges, when the yarn and the top roller When carrying different charges, according to the principle of mutual attraction of opposite charges, the fibers will be adsorbed on the surface of the machine to form a "three-wound", which brings great difficulties to the textile process. Increasing the relative humidity of the workshop can enhance the electrical conductivity of the fibers and parts, and the static electricity is easily neutralized by the machine. Therefore, improving the relative humidity of the workshop is one of the main methods to solve the problem of static interference in the workshop. Experience has shown that the relative humidity of the workshop is not less than 45%, and the static interference can be better eliminated when the relative humidity can reach 65%.



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