1. In actual production, the neps of tube yarn are normal. After winding process, the neps increase greatly. Will the winding process produce sudden neps? What are the main influencing factors?
Answer: Spinning yarn in winder processing will also cause sudden neps. The main reason lies in:
1) There are grooves and burrs in the yarn passages of individual spindles of winders, which are caused by intense friction of yarns.
2) The tension setting of winder is too large, resulting in excessive yarn tension;
3) Suddenly too large or too small relative humidity in winding workshop or too large or too small moisture regain of spinning yarn will also produce sudden neps.
4) Excessive hairiness or excessive length of individual or part of the yarn will cause neps in winding process.
5) The winder's individual spindles are not flexible in lifting, the bobbin cannot be lifted after the yarn is broken, or the distance between the bobbin and the grooved drum is too small to cause excessive friction between the bobbin yarn.
2. What is the reason why the sampling head is not cut when Lofei is changing from electro-cleaning to spinning?
When Lofei is out of the factory, the fixed sampling is to take 10 m after winding and cut the yarn once, in order to let the paper tube winding some spinning first, so that the spinning will not vibrate because of the uneven surface of the empty paper tube, resulting in the instability of the spinning of the sampling spindle in the detection trough. After the first clearing, the yarn is wound 120 m and cut again. This means that the average diameter of the single ingot has been collected. Then in each sample ingot, comparisons are made. As long as the diameter difference between one ingot and other ingots exceeds the internal fixed value, the average of the abnormal ingot is not included in the weighted average, and a message will be given.
Whether the first yarn cutting needs to be set through the machine architecture code or not. The second cut yarn must be available and cannot be changed. Since the machine architecture code can only be set or changed by trained people, if you move it randomly, the whole system will cause unnecessary troubles, so we usually do not recommend customers to enter the architecture code window. It is possible that the operators of the enterprise have changed carelessly. At present, only if you can start the control box cold and restore the factory value, your problem will be solved.
3. How did Uster detect the first zero error? Can it be prevented? How to repair it?
Main cause:
1) The detection tank is not clean or has foreign body.
2) sensor or hardware failure.
How to avoid:
1) Maintenance of the inspection tank should be done according to the maintenance manual.
2) Capacitive electrolyte can not be used in the production of yarns containing conductive fibers.
3) Solvents such as alcohol should not be used for cleaning photoelectric electrolytes.
4) Compressed air must be oil-free and water-free;
5) No Hard Object Contact Detection Tank
How to repair: It can be sent to Uster Maintenance Station for repair.
4. Reasons and measures for the high failure rate of twisting of Murata winder?
Reason analysis:
1) Photoelectric yarn sensor accumulates too much dust and flowers, and the sensor always detects the existence of yarn.
2) The accumulated flowers and silk in the suction duct affect the wind force, so that the negative pressure of the large suction nozzle is too low to inhale the yarn.
3) Big suction nozzle is too large to suck yarn, and continuous action causes splicing errors.
4) The relative humidity in the workshop is too high, and the adhesion of yarn is strengthened, which is close to the surface of the yarn. The broken ends of yarn can not be captured by the big suction nozzle.
5) The suction channel of the suction nozzle is blocked by the return silk, and the yarn can not be caught during the yarn catching action.
Measures:
1) Clean the yarn sensor every day and wipe the sensor device with warm water every week to avoid the false detection of the sensor and affect the detection effect.
2) It is advisable to correct the distance between the big suction nozzle and the yarn in time and to adjust the proximity of the big suction nozzle to 1.5mm~2.5mm.
3) Reasonable control of relative humidity in workshop. Generally, it should be controlled at about 70%.
4) Clean up the dust accumulated in the groove of the big suction nozzle, clean the big suction nozzle and grab the yarn rack with gasoline, and remove the blocked return wire.
5) Clean up the reeling in the passage of the small suction nozzle.
Fifth, why do customers have the reflection of yarn defect and cutting?
After any electronic yarn clearer bobbin yarn, inevitably there will be "yarn defect slitting" complaints, which is unavoidable and insurmountable. The yarn faults of its missing cut include the following:
1) Under the clearing curve and the yarn defect classification is not set as "C" to remove the yarn defect, that is, acceptable yarn defect.
2) For example, the yarn defects of B1-1, B1-2, B1-3, B1-4 and A1-2 are usually set as acceptable yarn defects. The yarn defect staple fibers are high in content and are all planktonic fibers. In the first winding of the yarn defect, the along-going planktonic fibers will pass through the electronic clearer and remain on the yarn. However, downstream customers, whether flat or knitted, will use these yarns, the original downstream plankton fibers caused yarn defects, because of the second processing, into reverse plankton fibers, and after the guide eye, will be due to the plankton fiber collection, will originally belong to B1-1, B1-2, B1-3, B1-4, A1-2 yarn defects, rise. Grade A4, B2 or C is harmful to spinning quality.
