Spinning yarn doffing skills in textile mills
Spinning yarn doffing work is an important part of the spinning workshop production. All the work of the doffer is centered around high quality, high yield and low cost. To be consumed. The speed of doffing should be fast, and the hair will grow. Once you are familiar with it, it will get better and better. The basic points of doffing are as follows:
1. Tight organization and consistent action
The spun yarn doffing group is a group of 4 to 6 people. Therefore, the doffing workers should obey the unified dispatch and command of the doffing chief. As soon as they arrive at the machine to be doffed, they should all take their positions to achieve tight organization, coordinated movements, and Act in unison and give full play to collective strength.
2. Reasonable arrangements and mutual cooperation
Drawing yarn, putting on the machine, intubating, and managing Starting, pressing and threading are the basic contents of the doffing work method. Reasonable organization of these tasks is an effective way to improve efficiency. Therefore, the methods of positioning numbering, program round-trip, division of labor, mutual cooperation, and close cooperation are adopted to achieve short downtime and high production efficiency.
3. Strengthen cleaning work and improve product quality
Cleaning work should be arranged reasonably and evenly in It is carried out within the gap between each doffing of a shift, using the method of “three actions, four fixes, and five no landings”. The doffer’s cleaning work must be gentle to prevent flying particles from being brought into the yarn sliver and causing artificial defects.
4. Improve operation level and continuously improve production technology
Prevent backlash when doffing and threading When the yarn is attached, it is strictly forbidden to regenerate the yarn, wind the yarn, and twist the joint. During cleaning work, prevent flying particles from bringing into the yarn sliver. Pay attention to whether the spindle tape is in the spindle plate to prevent tight twisting or weak twisting of the yarn.
5. Prevent artificial defects
Prevent the attachment of yarn residue when doffing and yarn starting. It is strictly prohibited. When regenerating the head, winding the head, twisting the joint, and cleaning work, prevent flying flowers from being brought into the yarn sliver. Pay attention to whether the spindle tape is in the spindle plate to prevent tight or weak twisting of the yarn.
6. Strengthen the sense of responsibility and improve quality awareness
Do not leave your job without reason. If yarn quality problems are discovered, they should be reported immediately, the operation method should be carefully implemented, the doffing time should be implemented, the doffing stop time should be shortened, and the efficiency of the spinning machine should be improved.
Effective measures to reduce end-breaks in spun yarns
Reduce end-breaks and increase Yields can be worked through a “two-step approach”.
Step 1: Fine finishing
The ring plate and yarn guide plate should be level and have little shaking (the two positions are stable ); the lifting and lowering of the ring plate and yarn guide plate must be flexible and light (flexible movement); the spindle, ring and yarn guide hook must be “three concentric” during the entire lifting and lowering process of the ring plate. After the winding and twisting mechanism is finely renovated, the diameter of the bobbin package can be increased accordingly to ensure that the large yarn does not touch the steel ring and reduces end breakage.
Second step: Targeted innovation
In view of the deficiencies in balloon shape control, modifications The innovative method of the outer ring contour of the winding wheel can compress the balloon height in the small yarn stage as much as possible, while also increasing the balloon height in the long yarn stage. Although the motion trajectory of the yarn guide hook has changed, the highest position of the yarn guide hook remains basically unchanged when the yarn is full. For a given spinning machine, controlling the lowest position of the yarn guide hook (16mm to 22mm above the bobbin head), the highest position (up to 3mm above the machine surface) and optimizing the intermediate motion trajectory can significantly reduce end breaks. Using the weight of the traveler to control the shape of the balloon, taking into account the preference of small yarns to large yarns, and reducing the weight of the traveler as much as possible (a lower balloon height in the small yarn stage is better) will be more conducive to reducing end breakage in the large yarn stage.
Practice has proven that the “two-step method” of renovation and innovation of the spinning frame can effectively reduce end breaks, increase the bobbin capacity, increase the spinning speed, and achieve the purpose of increasing unit yield.
How to prevent mechanical defects by combining basic operations
In order to improve product quality and reduce breakages, To reduce yarn defects, spinners must not only be proficient in operating techniques, but also must be familiar with mechanical performance and become the master of the machine. In the actual production process, spinners want to combine basic operations to prevent mechanical defects, mainly from the following aspects:
1. When pulling out the yarn, the bobbin feels thick and hard, and the rubber roller does not work after inspection. In place, the pressure fails, the rubber roller is short of oil, the roving is wound around the back roller, the roving does not pass through the bell mouth, the roving is double-fed, the wire ring is too heavy, the spindle belt slides up the spindle tower, etc. If the bobbin feels loose, check the spindle for lack of oil, the wire ring is too light, the roving is defective, the spindle belt is loose or slips out of the spindle plate, there is too much yarn on the spindle or in the bobbin, etc.
2. When looking for the end, you can see feathers on the inclined surface of the bobbin. Check whether the steel ring is rough and floating, the wire ring is used incorrectly or worn, the spindle is crooked, the steel plate is lifted, the yarn sliver jumps out of the collector, and the cleaner Failure, the gauze plate is rough, etc.
3. When drawing yarn, if you see uneven slubs in the drawn yarn strips, check whether the bell mouth of the drafting part is blocked or skewed, the yarn strips touch the rubber ring frame, the collector is damaged, or there is accumulation of flowers. , Flying particles are included, yarn strips jump out of the collector, accumulation of flowers on the lower apron, apron cracks and deformation, flying particles are included, apron deformation, shaking, no apron, roller shaking and roving defects, etc. The lower rubber ring is deviated, missing, damaged, deformed, the nylon plug is installed backwards, missing, used incorrectly, the tension plate is deformed, blocked, does not fall into the groove, the rubber roller is shelled, etc.
4. When lifting the yarn, it feels tight in the hand. Check whether the spindle is skewed, shaking its head, the steel ring is floating, rough, the wire ring is worn out, the yarn guide hook, the yarn guide plate are not correct, and the cleaner touches the wire ring and spacer. The yarn board is rough, etc.
5. When joining, track and inspect various broken ends. found tightropeIf there are flowers on the hoop, check if the cleaner fails, etc. If the head is found to be floating, check if the flute tube has hairy eyes and the channel is blocked; if convex yarn is found, check if the sheep’s feet are blocked, if the ring plate is blocked, etc.; if the bobbin is found to be skipped, check the spindle or bobbin Defective, there is yarn waste on the spindle, etc.; if the entire yarn is poorly formed, check the head and teeth to turn over. </p
