The definition and hazards of conductive fibers
Foreign fibers refer to non-cotton fibers and colored fibers mixed into cotton that have a serious impact on the quality of cotton and its products, such as chemical Fiber, hair, silk, linen, plastic film, plastic rope, dyed thread (rope, cloth), etc. Here, foreign fibers are divided into two categories, one is other fibrous substances other than cotton fibers, and the other is colored fibers.
Foreign fibers mixed into cotton are not only difficult to remove during the spinning process, but will also be broken or combed into shorter and finer fibers during the impurity removal process. , forming a large number of small fibrous defects. During spinning, these defects can easily cause yarn breakage and reduce work efficiency. After the fabric is dyed, various color spots will appear on the cloth surface, which seriously affects the appearance quality of the cloth surface and ultimately affects the domestic sales and export of the product.
If cotton is found to be mixed with foreign fibers during use, you can apply for inspection from a professional fiber inspection agency. During the inspection, 5% of the unopened cotton bales are randomly selected, and the bales are opened and sorted one by one. If no foreign fibers are found, “not found” will be noted in the “foreign fiber” column of the inspection certificate; if foreign fibers or foreign fibers are found mixed with Colored fibers will be downgraded based on quantity.
Measures to control foreign fiber and colored fiber Once cotton is mixed in, it cannot be sorted out. To eliminate it, we must eliminate it at the source just like we eliminate “fire”.
Intensify law enforcement
Cotton quality standards are mandatory by the state standards, relevant departments should increase publicity and training while increasing law enforcement efforts to purify market order. Let companies with good product quality enjoy the benefits, and let those who make shoddy products and adulterers suffer. Professional fiber inspection agencies at all levels should promptly accept inspections of reported heterosexual fibers to safeguard the legitimate interests of cotton spinning enterprises and promote the development of the textile industry.
Improve ideological understanding
Operators of cotton production enterprises must Enhance legal awareness and raise awareness of the importance of cotton quality. Shoddy manufacturing not only wastes precious cotton resources and violates quality regulations, but is also very harmful to the establishment of corporate image and long-term development of the company, and is a hidden danger of quality claims.
Focus on the three links
The acquisition link
Purchasing quality is the basis of lint quality. The purchasing process is crucial to prevent mixed grades and control the “three silks”. Specifically, we should do the following:
1) We must strengthen publicity to let cotton farmers fully understand the importance of the “four points” and ensure quality consistency from the source. Qualified enterprises can establish planting bases, implement factory management, implement order planting, establish a community of interests with cotton farmers, and extend quality control to the fields.
2) The source of the “three silks” lies in the stages of picking, drying, packaging, storage and transportation. The parties involved are cotton farmers and traders. We must educate them so that they can fully understand ” They are required to use cotton bags to pick and package cotton, spread it on high racks to dry, not pile it up in scattered warehouses, and do not use non-cotton yarn to tie the bag mouth; they insist on not accepting cotton packaged in plastic bags during the acquisition, and do not accept cotton packed in plastic bags after inspection. The seed cotton of “Three Silk” seeds shall be of high quality and at a good price, and the economic lever will be used to encourage cotton farmers to sell cotton without “Three Silk”; after the cotton is purchased and entered into the factory, all personnel who come into contact with the cotton must wear hats and not wear clothing that can easily shed foreign fibers; Strictly control the entry of various items that may produce “three wires” into the cotton storage site.
3) Control the wet flowers and dry flowers. The bloom is very harmful to the quality of cotton. First of all, it is easy to form a large number of neps during the processing of the bloom. When the bloom blooms, the fiber has strong adhesion to the cotton seeds. There is a high chance of breaking when peeling off, and it is easy to be damaged. The fiber increases the short staple rate; secondly, the tide flower is easy to generate heat, and the heat will cause the strength of the cotton to decrease and the color to turn yellow. When processing the tide flower, it is easy to generate heat and cause a fire; thirdly, the tide flower also affects the weight, and the moisture regain rate of seed cotton every day. One percentage point higher, the weight loss of seed cotton is 2% to 3%. Because the lint rate of cotton seeds is high during the processing of tidal flowers, the tidal flowers will reduce the clothing weight. In addition, the wet seeds of clothes are also called sun-exposed flowers, which are not easy to be detected by instruments during purchase. Its harmfulness is the same as that of tide flowers, so special attention should be paid when purchasing it.
4) Adhere to the principle of one trial and six trials, high quality and low price, and classify and stack according to quality. With the improvement of cotton quality requirements in textile mills, the traditional one-test-five-determination method (product length, clothing, water, impurities) can no longer meet the requirements. For high-grade cotton, the micronaire value that reflects fiber maturity should be added and divided according to the micronaire value. Files are stacked.
Pick the “Three Silks” link
Pick the “Three Silks” It has now developed into an important production process for ginning enterprises, with the number of workers equivalent to or even exceeding the traditional ginning and velvet stripping process. The main task of this link is to remove harmful debris such as “three silks” in seed cotton. The removal method is generally manual picking on a special workbench, which can ensure the quality of removal; it is also to eliminate defects, that is, to remove defects. The core-wrapped cotton at the bottom of the bag is of equal difference to improve the consistency of the entire batch of cotton. For example, using a special workbench with a grid can also eliminate some dead flowers.
Processing link
The processing link affects the neps and silk of lint. Cord, short velvet, and impurities have a greater impact. The following tasks should be focused on:
1) Control the moisture regain of seed cotton. When the moisture regain rate is high, the fiber rigidity is poor, and it is easy to twist into neps and cords during the ginning and screening processes; when the fiber moisture regain rate is high,The adhesion on the teeth is strong, making it difficult to sieve cotton and blow out the cotton. The saw teeth are easy to produce flowers, and the return flowers are also prone to increase neps and cords.
2) Control the vehicle speed. The speed of the saw shaft is high, and the saw teeth have a strong impact on the fibers, which can easily break the fibers and increase the short lint in the lint. The cotton feeding speed is fast and the density of the cotton roll is high, which can easily form cords and increase the short lint.
3) Sawtooth state. The serrations must be kept intact, without burrs, skew, or reverse bends. If abnormalities are found, repair them in time, otherwise neps will increase.
4) The four walls of the work box and each channel should be kept smooth and free of burrs, and the debris removal channel should be smooth and free of debris.
5) The gap between the saw blade and the ribs must be uniform, otherwise the fiber bundle captured on the saw teeth cannot pass smoothly between the ribs and will rub violently with the rib side, which will cause Lots of cord.
6) According to the impurity content of the lint, adjust the distance between the saw teeth and the impurity-removing rolling knife, and ensure that as much whiteness does not fall off as possible without touching the knife. , Level 1 to 2 impurities should be controlled below 1%, and Level 3 to 4 impurities should be controlled within 1.5%.
7) Try not to use a skin cleaner. Using a lint cleaner can improve the appearance of lint and reduce the impurities contained in lint. However, because it uses a high-speed licker-in to loosen and remove impurities, it will cause great damage to the fibers. If the licker-in is not in good condition, a large number of neps and cords will be produced. , it will also break up some large impurities and add many small impurities that cannot be removed by textile mills. </p
