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What are the control measures when frequent yarn defects are high

Update:29-04-2021
Summary:

When there are many frequent yarn defects and the DR% v […]

When there are many frequent yarn defects and the DR% value (±20%, 0.01m) is too large, the control should be strengthened mainly from the aspects of raw materials, process parameters, mechanical conditions, operation management, temperature and humidity.

In terms of raw materials, spinning materials with normal maturity, fineness, long length, good length uniformity, and moderate surface friction coefficient are selected for spinning. It is easy to control the movement and speed of the fiber during the drafting process, which is conducive to the uniformity of the fiber in the yarn section. Distribution, the effect of reducing frequent yarn defects is obvious.

In terms of process parameters, it is necessary to reasonably design the opening, carding, impurity removal, and knot reduction processes to ensure that the fiber has a high degree of separation, straightness, and parallelism, reduce the number of neps and impurities in the card sliver, and control the damage to the fiber. Reduce the lint content in the yarn sliver, choose a suitable drafting gauge, reasonably distribute the drafting multiples of the combined, thick and fine processes, correctly configure the distribution of the draft before and after each process itself, and determine the appropriate jaw gap Distance, stable drafting force in the process of drafting, to ensure the normal operation of the fiber and variable speed.

In terms of mechanical condition and equipment, it is necessary to select rubber rollers and rubber rings with low hardness, large elasticity and good antistatic properties, and control the diameters of rubber rollers and rubber rings to ensure that the rubber rollers have no eccentricity and beating phenomenon; the rubber rings have no cracks and thickness. Uniformity, inconsistency of left and right inner warp, running lag, middle bowing, etc.; no bending, jumping, bad tooth shape, tooth embedding, surface corrosion, upper and lower roller bearing lack of oil, running back and forth, and needle ball wear, etc. ; The bell mouth, the cluster opening size is appropriate, there is no jamming, hanging flowers, incorrect position, etc.; the drafting gear meshing is not too loose or too tight, missing teeth, broken teeth, tooth top wear, loose keyway, radial runout, etc. ; There is no guide yarn hooking groove, ring aging, traveler hanging flower, traveler yarn channel wear, traveler is too light and heavy, etc.; winding without yarn insertion seat position is incorrect, tension plate is too heavy, tension plate center Shaft grooving, yarn guide rod or yarn probe grooving running white thread, grooved drum guide groove grooved yarn hanging, grooved drum surface has burrs, drum spindle angle is not correct, auto-stop box lacks oil or oil is too thin, grip arm Phenomena such as large and small nodding, excessive winding tension, etc.

In the operation and management, it is necessary to clean the drafting area in time, prevent the wool from moving when cleaning, do not touch the sliver and roving during operation, and the sliver is not fed backwards and so on.

In terms of temperature and humidity management, it is necessary to reasonably adjust the temperature and humidity requirements of different raw materials in the workshop to ensure a good life and no sticking phenomenon.

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