The spinning process involves many types and quantities of various spinning accessories, and the influencing factors such as operation, technology, and air conditioning are complex. It is easy to cause accidents and cause some sudden quality problems. The following is from the equipment status and The two aspects of operation are briefly explained and analyzed.
◆Quality caused by poor equipment status Problem ◆
1 Damage to the front rubber roller
Damage to the front rubber roller is mostly caused by local gnawing and grooves throughout the entire circumference. It is a serious problem in the spinning process. Frequently asked questions about accessories. When the damage to the front rubber roller is serious, the damaged part cannot effectively hold the fiber during the drafting process, and the quality of the spun yarn will deteriorate significantly.
2 The upper pin spring loses pressure
The roller and rubber roller are serious The entangled flowers cause the upper pin spring to lose pressure, and the upper pin and the lower pin cannot form an elastic jaw. In severe cases, the upper pin will rise up to form a “hanging ring” phenomenon, completely losing control of the fiber, resulting in severe draft waves. Not only will the yarn dryness deteriorate, but it will also cause serious length, thickness and thinness problems.
3 The rubber ring does not work properly
Causing the rubber ring The main reasons for poor operation are accumulation of flowers in the upper pin and rubber ring, loss of pressure in the middle and upper rollers, or deformation of the upper pin. When the upper apron fails to function properly, the roving strips in the rear area will relax. Since there is no pre-drafting in the rear area, the roving sliver entering the front area is still relatively loose. During the drafting process, the friction cohesion and control force between fibers are weakened, resulting in deterioration of the sliver and increased drafting efficiency, which makes the spun yarn The yarn number becomes smaller, resulting in yarn deviation, and long and thin horizontal marks appear on the cloth surface.
In addition to the above-mentioned defects, when the operation of the upper apron is seriously malfunctioning, periodic beating will occur, causing the drafting jaws composed of the upper and lower apron to affect the fibers in the rear area. Drafting produces a periodic effect, and the mechanical wave generated in the rear area becomes longer in wavelength after being amplified by the drafting in the front area. Its wavelength depends on factors such as the period of rubber ring tapping, the draft ratio of the front and rear areas, and other factors.
4 Transmission component failure
Transmission component failure mainly refers to the transmission gear , transmission shaft and pin keys are damaged. Once this kind of mechanical failure occurs, it will cause quality problems in the entire yarn and cause a great impact, so it must be paid great attention to. In response to the problem of transmission component failure, daily cleaning and maintenance work should be strengthened, especially the inspection of key components.
◆Quality problems caused by improper operation◆
1 Wrong number of yarns produced during spinning
When starting spinning or doffing new varieties, operators habitually use the yarn they carry to start spinning. If the number or composition of the spinning yarn is different from that of the variety being spun, , the wrong yarn number will occur. The length of the wrong number yarn is shorter, but its impact on product quality is greater than the entire tube of wrong number yarn.
Wrong-numbered yarns have two distinctive characteristics:
1) Wrong-numbered yarns are numerous and widely distributed, especially in When new varieties are spun, in order to speed up the spinning process, most of the operators are usually centralized in the spinning process, resulting in large-scale spinning of wrong numbers;
2) Wrong spinning The cause of yarn noise is very hidden, easy to reoccur, and difficult for managers to find. Wrong-numbered yarns of different numbers will produce long, thick and long details on the cloth surface. Wrong-numbered yarns of different compositions will cause horizontal stripping after the cloth is dyed due to different fiber dyeing properties.
Measures to solve the problem of yarn starting with the wrong number:
1) Operators’ quality awareness must be strengthened and yarns cannot be picked up casually. Raw yarn for different varieties;
2) Prepare special yarn for new spinning varieties in advance;
3) For varieties with large differences in fiber composition, it is best to produce them in separate workshops, or take separation measures to arrange operating hours for different varieties;
4) Be sure to clean the different types of yarn on the bobbin Variety of tail yarns.
2 Weakly twisted yarn is produced during doffing and cleaning of the spindle foot
When the operator cleans the spindle foot or manually pulls and doffs the yarn, if the operator is not careful, the spindle tape may easily fall off the spindle tray and hang on the side of the spindle tray with a larger diameter. The diameter of the side of the spindle tray is larger than that of the spindle tray. , the corresponding spindle speed will be slower than normal, causing the yarn twist to become smaller and produce weak twist.
After testing, when the spindle belt deviates, the corresponding yarn twist will be reduced by 15% to 20%, the yarn performance will change greatly, and the yarn structure will become loose. , the fabric will have obvious horizontal marks after dyeing. To reduce this type of weakly twisted yarn, the quality awareness of operators should be strengthened and special inspections and assessments in the workshop should be strengthened. It is best not to use a brush when cleaning the spindle foot, but to use a twisting gun to retrieve the silk fly. </p
