The reasons for the occurrence of long details are relatively complex. In actual production, many factors will cause different types of long details. The following will be discussed from the three aspects of equipment, operation and process.
Equipment factors
1. End merger
The guide roller rotates inflexibly and is easy to get stuck; the surface of the guide roller has rust spots or burrs on the collector, bell mouth, coiler and other parts, which are easy to hang; the roller rubber roller is eccentric, and the surface of the rubber roller roller is stained with cotton wax, which is easy to Tangled flowers; loose transmission key pins, worn gears, sluggishness during operation; automatic stop failure.
2. Roving
Burrs and hanging flowers on the guide roller; burrs on the yarn channel such as the spindle cap, hollow arm, rear bell mouth, etc., and cotton wax adhesion causing unexpected tension increase; the upper pin is skewed and deformed, the pressing palm is deformed, etc., causing the cotton sliver to be accidentally pulled stretch.
3. Spun yarn
Rusty spots and burrs on the guide bar lead to burrs; burrs and burrs on the bell mouth cause burrs; the hanging spindle rotates inflexibly; the upper pin is skewed and deformed; the rubber roller and rubber ring are damaged.
operating factors
1. End merger
The guide roller is lifted artificially; there is a shortage of strands to feed, the automatic stop fails, and the lathe cuts the sliver cleanly; the cotton sliver is damaged due to improper operation during transportation and handling; the joint is unqualified and too thin; after the rubber-wrapped roller is used, , failed to find the defective strip.
2. Roving
The cotton sliver is twisted and split behind the machine; the joints before and after the machine are illegal and too thin; the cotton sliver does not pass through the normal channel and is wrapped around the guide fork.
3. Spun yarn
During the unwinding process, the roving does not go through the normal passage and winds around the cradle shaft, yarn guide rod, rubber roller, etc., which can easily cause accidental drafting; the drafting area is poorly cleaned, the apron is pinched, and the upper pin is lifted, resulting in Accidental drafting; unqualified joints (strong twisting).
Process factors
In terms of technology, it is mainly the influence of tension on the yarn.
End of doubling: The draw frame guide bar tension is too high; the coiling bar tension is too high.
Roving: The tension of the guide bar of the roving machine is too large; the winding tension is too large; the tension difference between large, medium and small yarns is too large.
In short, excessive tension in each process will provide more opportunities for accidental drafting. On the premise of ensuring normal production, it should be controlled to a small value.
Long details of precautions
1. Strengthen the management of temperature and humidity in the workshop, reduce the phenomenon of winding and blocking in each process, and make timely adjustments when fluctuations are found.
2. Strengthen equipment maintenance to keep the spinning channel clean and free of cotton, wax, impurities, burrs, etc., and calibrate key parts such as the upper pin and the palm on a regular basis to ensure good gear meshing, and eliminate aging gears.
3. Improve the level of operation management so that new employees have quality awareness and understand the basic quality requirements of yarn. There should be no joints before and after the machine, and there should be awareness to check for defects caused by thin strips and missing strands in the previous process.
4. Tighten the threshold value of long details in electronic clearing so that yarn defects with long details can be caught in time before leaving the factory.
5. Actively test the spinning process and choose the best tension configuration.
6. Develop a complete inspection and assessment system and responsibility system for various factors that are prone to growth details.
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