The spinning process involves many types and quantities of various spinning accessories, and the factors affecting operation, technology, air conditioning, etc. are complex, which can easily cause accidents and cause some sudden quality problems. Here are four aspects: Carry out simple explanation and analysis.
Sudden quality problems caused by poor equipment status
01 Front rubber roller damage
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Damage to the front rubber roller is mostly caused by local gnawing and grooves throughout the entire circumference. It is a common accessory problem in the spinning process. 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.
02 The upper pin spring loses pressure
The roller and rubber roller are seriously entangled, causing the upper pin When the spring loses pressure, the upper pin and the lower pin cannot form an elastic jaw. In severe cases, the upper pin will lift up to form a “hanging ring” phenomenon, completely losing control of the fiber and generating severe draft waves, which will not only cause damage to the yarn The deterioration of the stringiness will also cause serious problems of length, thickness and length.
03 The rubber ring does not work properly
The main reasons for the rubber ring not working properly It is caused by 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.
04 Transmission component failure
Transmission component failure mainly refers to transmission gears, transmission shafts and pins Wait for damage to occur. 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
01 The wrong number of yarns are produced when spinning yarn
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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 operator will Wrong number yarn will be produced. 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.
Spinning up yarns with wrong numbers has two distinctive characteristics. First, the number of yarns with wrong numbers is large and widely distributed. Especially when spinning new varieties, in order to speed up yarn spinning, it is generally Most of the operators collectively raw the head, and the phenomenon of large -scale raw fault number appears; the second is that the cause of the number of errors is concealed, and it is easy to repeat. It is 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.
To solve the problem of spinning up the wrong number of yarns, one is to strengthen the quality awareness of the operators and not randomly take yarn to spin up different types of yarn; the other is to spin new varieties in advance Prepare special raw yarn; third, for varieties with large differences in fiber composition, it is best to produce them in separate workshops, or take separation measures to arrange operating work points for different varieties; fourth, be sure to clean the tail yarns of different varieties on the bobbin. .
02 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 goes off track, the corresponding yarn twist will be reduced by 15% to 20%, the yarn performance will change greatly, and the yarn structure will become loose, and obvious transverse marks will appear after the fabric is dyed. 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
