Textile knowledge release: grade inspection of abnormal cotton
Unusual cotton refers to stalk stripped peach cotton, gray dyed cotton, frost yellow cotton, fire-burned cotton, water-stained cotton, ground cotton, oil-stained cotton, etc. Doping, adulterated cotton and Chen cotton can also be classified into this category. Pulling straw and peeling peach cotton Pulling stalks and peeling peach cotton is due to frost, pests and diseases, drought, etc., cotton plants can not normally carry out metabolism, cotton boll development is affected. Some half-cracked or un-cracked cotton bolls are dried and stripped of the removed fibers. These fibers have a poor maturity and the base color is white or yellowish white or blue. A little better is also white, no mercerizing, or with a light block, usually no yellow dye, weaker strength, soft and weak hand, poor elasticity. When inspecting the grade, it is necessary to focus on its intrinsic quality and consider its use value, and adopt the color quality combined with the comparison of the physical standard. Generally, it is suitable to be graded in four to six levels. For example, the standard color is equivalent to three levels, but it is dull, and the quality is worse than the physical standard of the same level. It should be set to four levels; the color is equivalent to a level below the standard level. The quality is 2 levels lower than the physical standard of the same level and should be determined as the middle level. Gray dyed cotton Gray dyed cotton is due to the rainy rain when the cotton bolls are spun, the cotton fibers are exposed to rain, the color is gray and dull. If continuous rainy weather, some microorganisms may invade the fiber to reproduce, so that the fiber deteriorates into dark gray or grayish black, the strength is very weak, and the heavy ones will produce bad velvet. For this type of cotton, it should be graded according to its maturity, strength and gray depth. According to the strength and color depth to determine its grade. Generally set to level 4 and below, especially good for the highest level of three. Such as: gray type, pan blue light, the same color. The fiber is difficult to break, compared with the physical standard, it can be set to three grades; light gray, better than the general fiber strength, can be set to four grades according to the physical standard; the color is gray, the color is not uniform, the fiber strength is still good, according to the physical standard, Can be set to five levels: color ash pollution mixed, fiber capacity is relatively poor, compared to the physical standard, can be set to six; dark gray pollution is heavy, fiber strength is very weak, compared to the physical standard, can be set to seven. Frost yellow cotton Frost yellow cotton is due to the influence of frost in the late growth and development of cotton. The fiber is immature and stops developing, and the color turns yellow. The color of frost yellow cotton is related to the maturity of the fiber and the severity and frequency of the low temperature frost damage. If the fiber is basically mature and dehydrated, after the low temperature frost, the fiber is yellowish, yellowish or cloudy. Generally, the deeper the color of the yellow cotton, the worse the quality, and the yellow cotton color is deep and strong, and the color is light and the strength is poor. At the time of inspection. The intrinsic quality should be compared with the standard of the use of the yellow cotton standard to determine the level. If there is no yellow cotton standard, it can be graded according to the intrinsic quality and color of yellow cotton, generally considered in four to seven levels. For example, if the color of cotton is yellow and yellow, and there is a small amount of late white cotton, the maturity is good, the strength is good, it can be set to four grades; the color is pure yellow, the maturity is slightly worse, the strength is general, the surface is slightly dirty, can be set to five grades. The color is reddish brown, low in strength and polluted. There is a bad velvet, which can be set to six grades; the color is reddish brown, the strength is particularly low, and the pollution and bad velvet are more, which can be set to seven grades; when the hand touches the raw cotton during the inspection, the hand rips the cotton layer to adhere, and the various contaminated fibers are mixed. The light sheet and the bad velvet are serious, and this kind of cotton has no use value.  Doped adult cotton Cotton blended with two or three types of cotton linters, the color is gray and fine, and there are short piles. The cotton blended with cotton is fine and mixed with dark colors. When the length of the hand is pulled, the short fiber content is high and the length is uniform. Cotton mixed with bleached cotton, the color is white and white. The fiber is extremely poor and has a pungent chemical odor. Cotton blended with chemical fiber, white color, can feel the elasticity when pulling the length (can be judged by burning to determine whether there is chemical fiber). Cotton blended with combed cotton, with less impurities, white, and short fibers. For doped and adulterated cotton, it is best not to fill the grade on the inspection certificate. And specifically explain the amount of material contained in the cotton, what kind of material, the proportion of cotton sample doped, adulterated cotton, etc. If the content is small and does not affect the normal use, it should be noted in the remarks at the same time as the filling of the grade, indicating what kind of substance, content, proportion, etc. (inspection grade should be strictly controlled). Chen Mian Chen Mian's test should be based on maturity, according to its variation and color depth combined with the use value, compared with the physical standard. When the reserve cotton is put into storage, it is high grade cotton. The raw cotton does not contain bad velvet, although the original cotton color is yellow, but the fiber internal quality is better. The color depth of the fiber is affected by the length of the cotton inventory and the storage conditions and grade of the raw cotton. When inspecting the grade, it is not allowed to be “one size fits all†and it should be inspected according to the actual conditions. For cotton with small color change, good maturity and good strength, the test can be higher than the fourth grade. Such as: maturity is equivalent to two levels, the color is equivalent to four, with mercerizing, strong. Generally, the rolling mill should be set to three levels. For cotton with obvious yellowing of cotton, it should be treated with yellow cotton. Most of these cottons are between the four and five grades. The six or seven levels basically do not exist. For cotton such as fire-burned cotton, water-stained cotton, ground cotton and oil-soiled cotton, the grade should be determined according to the standard value. Fire-burned cotton, oil-stained cotton, ground cotton and heavier water-stained cotton are generally not suitable for textile use. The lighter cotton fiber mainly considers the strength. If the strength is not significant, it still has the use value. It can be inspected according to the normal cotton, but it should be stored in a separate package and marked with the mark. In short. For the inspection of abnormal cotton, the characteristics of cotton samples should be analyzed, and the value of use should be considered according to the grade conditions, and the classification should be comprehensively graded.  Auto Parts,CNC Machined Auto Parts,Swift Kizashi Auto Parts Zhulian Electric Appliance Co., Ltd. , http://www.jx-diecasting.com