The quality of the carded yarn directly affects the quality of the fabric. During the spinning process of the spinning frame, the semi-finished roving or sliver is drafted, twisted, and wound into a spinning machine. The combed sliver and the needle-carding machine combine the sliver, the needle row is drafted to improve the sliver structure, and the roving is further spun into spun yarn on the ring spinning frame, which is the main spinning machine. Carding machines are used to process cotton fibers and chemical fibers and belong to textile machinery.
According to the spinning process, carding is an important process. The front process of the carding machine is the opening and cleaning machine, and the latter process is the drawing frame (carding process) or the sliver coiler (combing process). The structure of the double twisting unit of the double twisting machine mainly includes the spindle braking device, the spindle part of the double twisting machine, the yarn winding device, and the special device of the double twisting unit.
Therefore, the sizing rate, moisture regain and elongation rate of yarn quality indicators should be strictly controlled, and checked and analyzed frequently. Carding machine sizing quality index (1) The sizing rate of the carding machine is the main index of the sizing quality, and the sizing rate should meet the requirements of the sizing process and be uniform and stable. The sizing rate is expressed as a weight percent of the added warp weight before sizing.
The size of the sizing rate is actually due to the amount of sizing attached to the warp yarn after sizing. Therefore, the sizing rate to a certain extent indicates the strength and wear resistance of the warp yarn in the process of sizing. The sizing rate index system should be determined according to different yarn characteristics, twist, and fabric organization and density.
The smaller the special number of the warp yarn, the higher the sizing rate; the greater the twist of the warp yarn, the lower the sizing rate; the higher the density of the warp yarn of the fabric, the more friction the warp yarn receives during weaving, the higher the sizing rate; the plain weave The weave point of the fabric is more than that of the twill and satin fabric, and the warp direction will be developed and subjected to more research on buckling and stretching during weaving, so a higher sizing rate should be selected. Once the sizing rate is determined, the difference analysis range we Strict management and control must be established, and the yarn moisture regain can be slightly larger to avoid brittle ends; in the rainy season, the moisture regain can be low and mastered; the sizing moisture regain of fine, extra-high-density fabrics can be slightly higher. (2) Carding machine sizing elongation and control research scope Cotton yarn: within 0.5%-1.2%; polyester/cotton blended yarn: 0.8%-1%; wire material: dry negative elongation 0.1%-0.3% , the positive elongation is 0.1%~0.3. When sizing, the warp tension should be actively controlled by grading as much as possible, the tension in the unwinding area should be small and uniform, and the tension in the stretching area should be small to facilitate sizing. Tension, the tension in the drying area should be appropriately increased to improve the effect of hock and sticky hair, the tension in the yarn splitting and winding area should be slightly higher according to the process requirements, and the sizing elongation should be controlled within the specified range.
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