The quality of combed cotton yarns is relatively high, and the number of neps particles is less than half the number of particles of the same linear density carded cotton yarns, because the comber can remove a considerable amount of neps impurities, especially the impurity removal rate reaches 50. % ~ 60%, 10% ~ 20% can be excluded for neps.
To reduce neps impurities and yarn defects, in addition to the rational selection of raw cotton, the full use of the cleaning and carding process to eliminate impurities and the prevention of neps, the following points should be noted in the combing process:
(1) Improve the preparation process of small rolls, improve the quality of small rolls, and strive to improve the uniformity of the small and vertical rolls and the parallelism of the fiber straight, so as to give full play to the carding effect of the comber.
(2) Improve the mechanical state of the carding machine, especially the carding state, which is the key to improving the carding effect. For example, rationally adjust the comb needle specifications and needle density of cylinders and top combs, keep the needles missing, and keep the needles in good working condition, trim the brushes in time, improve the flatness of the brushes, and maintain the elasticity of the bristles to improve The working efficiency of the brush ensures that the needle surface of the cylinder can be cleaned.
(3) Correctly master the combing process, reasonably adjust the timing of the separation roller to turn forward, the positioning of the bow of the cylinder, the timing of closing the nippers, and the carding interval.
(4) Reasonably control and control the combing noil rate. According to the quality requirements of the spun cotton yarns, the nodding rate is reasonably determined, and the state of nodding should be paid attention to at all times, so as to reduce the level difference and eye difference of the nodding.
(5) Strengthen operation management. During the operation, pay attention to the situation of sticking small rolls to prevent unclear layers or damage to the comb needles when feeding thick layers, which will affect the quality of the cotton web. At the same time, the cleaning cycle of the combing machine is properly drafted and implemented, and a better structure and material of the wool board are used to reduce combing yarn defects.
(3) Reduce the unevenness of combed sliver
Because of the periodic separation and combination of the cotton web output from the comber, the combed cotton sliver has a large periodic segment unevenness. After the subsequent process, the combined effect can greatly reduce the periodic unevenness of the combed sliver, and because the fiber separation and straightness of the combed sliver are better, there are fewer linters and defects, which is beneficial to The drafting in the subsequent process, therefore, the combed sliver has a good evenness.
There are many factors that affect the uniformity of combed sliver dryness. On the basis of improving the quality of small rolls and maintaining the normal state of the organization, the following points should be noted:
(1) Reasonable adjustment of process parameters and correct timing positioning;
(2) Correctly control the tension draft of each part to reduce accidental elongation;
(3) Keep the passages through which cotton nets and slivers pass;
(4) Strictly control the temperature and humidity of the workshop, so that the temperature and humidity of the workshop are controlled within the specified range, that is, the temperature is 20 ~ 30 degrees Celsius and the relative humidity is 55% ~ 60% to avoid improper temperature and humidity control. Problems such as broken edges of the cotton net and clogging of the sloping coils.
