What are the factors causing insufficient mercerizing gloss of yarn?
Answer: The factors that affect the finish of spinning yarn mainly include the following aspects.
①The impact of cooking on Wanze. If the scouring is uneven and opaque, the cleaning after scouring is not good, and the cotton yarn contains a lot of residual alkali, resulting in uneven capillary effect, difficulty in penetrating the alkali solution after the silk is finished, and the fiber cannot be fully puffed, which will affect the integrity of the silk. Therefore, the wool effect after scouring is about 12cm/30min, which is more beneficial to the silk finish.
②The impact of alkali cleanliness on finish. The newly prepared lye generally contains less impurities and has good silk finish. The alkali impurity content (such as soda ash, salt, etc.) used for silk finishing should not be too high, otherwise it will hinder the penetration of the alkali solution into the fiber, reduce the degree of fiber puffing, and affect the silk finishing effect. Generally, the soda ash content of lye used for silk fabrics should not exceed 159/L, and the salt content should not exceed 20g/L. If recycled alkali is used to make silk, caustic treatment should be carried out. Impurities and fiber fluff in the alkali solution must be treated to ensure the cleanliness of the alkali solution.
③The influence of alkali temperature on the finish. The temperature of the alkali solution should be strictly controlled during yarn finishing. If the temperature of the alkali liquid is too high, it will affect the yarn finishing effect; if the temperature of the alkali liquid is too low, it will affect the penetration of the alkali liquid into the fiber and also make the yarn finishing effect worse. When the temperature of the alkali solution is 15°C, the silk will be perfect and shiny. However, in actual production, most of them need to use recycled alkali, which makes cooling difficult. For this reason, it is generally appropriate to keep the temperature between 30 and 35°C.
④The influence of alkali on the spinning yarn machine on the finish. In addition to the alkali soaking time, tension and dealkali method, the yarn finishing effect is also related to the alkali content of the yarn spun on the next machine. The amount of alkali carried out of the machine is related to the squeezing and flushing time of the roller. If the amount of alkali carried out of the machine after spinning yarn exceeds a certain concentration, it will cause the spinning yarn to shrink again and affect the finish. For this reason, the alkali content of the machine must be controlled below 2%.
⑤The impact of water quality on the finish. During the entire silk finishing process, the quality of the water can affect the quality of the product. If you rinse the fiber with water with high alkalinity when finishing, since the water contains calcium, magnesium salts, chloride, and trace amounts of iron and manganese salts, these impurities will adhere to the surface of the fiber, causing the finish to fade and the hand to feel hard. Therefore, water quality and water purification are extremely important, and it is more advantageous for factories with conditions to adopt soft water.
⑥The influence of spinning yarn twist on finish. The twist size of the spinning yarn can directly affect the finish. Spun yarns with a large twist have better yarn finish, but have an impact on strength and have a smaller yarn finish value. The spun yarn with small twist has slightly poor luster after finishing, but has high strength and high yarn finish value. Therefore, the twist of the spun yarn used for yarn finishing should be slightly lower.
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