Total mechanical draft ratio and drum draft ratio 1. The mechanical total draft ratio can be selected according to the mechanical design in the range of 30-60 times, but usually in the range of 40-50 times, the before and after supplies are intended to refer to The yield with this card is determined. Special equipment for the textile industry on the winder. As the last process of spinning and the first process of weaving, winding is the link between the past and the next.“bridge”Therefore, it occupies an important position in the textile field.
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. 2. The draft ratio of the roller is generally within the range of 6-8.5 times. It can be decided according to the quantitative supply of enterprises before and after the students.
Second, the part of the tension-to-draw ratio 1. The tension between the cotton roller and the cotton lap roller is used for the drafting movement multiple. It is appropriate to increase the drafting multiple for the internal tension. Generally, it can be controlled at about 1.002-1.02. When calculating the draft ratio, the groove coefficient of the cotton roller is generally 1.01. The average groove coefficient of the cotton roll is generally 1.15.
figure 2. The tension draw ratio from the press roll to the separation roll affects the tension of the cotton web. If the tension is too large, the cotton web will break, and if the tension is too small, the cotton web will be wrinkled and the edges will be bad.
Under normal output conditions, general cartography should be less than 1.04. When the multiple secondary calculation of the vehicle pulls the grooved roller surface pressure coefficient and usually 1.20. 3. The tension between the back roller and the vehicle surface pressure roller carries out the drafting multiple. The internal tension in this period is the working table tension, which is related to the vehicle surface sliver. It is related to the quantification, the diameter of the cotton mesh horn and the temperature change of the workshop.
The choice of increasing the draft ratio of the tension during this time should be based on the enterprise reducing the unexpected elongation of the sliver in the production workshop, and it is not easy to cause the sliver to wrinkle. Generally, the requirement is not greater than 1.04. 4. The large tension between the platen rollers There is only a small tension to the multiple secondary stages of the front roller retractor, generally 1.029 is selected. 5. The tension between the small pressure roller and the large pressure roller is used for the drafting movement multiple. If the internal tension can be obtained smoothly and effectively, the Small is appropriate, generally 1.012 can be used.
Otherwise, we can increase the first gear, that is, use 1.03 when using a ￠350mm strip, and use 1.034 when using a ￠400mm strip. 6. The tension draft ratio of the small roller to the coil, when using a ￠350mm cylinder, choose 1.174, when using a ￠400mm elbow, choose 1.1790 This is based on calculated values. The actual tension draft is about 1.03~1.07.
In addition, tensions at the meeting contributed to a dry deterioration.