Increase Control Roller To Improve Evenness And Reduce Mao Yu

　　 Ring spinning frame The VC type curve drafting refers to a control roller with a diameter of 8 mm ~10 mm in the back area based on the configuration of the V type curve drafting roller in the back area, so that the curve drafting in the middle part of the back area develops into a control roller type.

Under the control roller, the yarn under the control roller generates the contact encircling arc, forming a strong additional friction field in the middle part of the back area, extending the surrounding arc length of the yarn on the rear roller surface, extending the friction field of the rear roller surrounding the arc, and connecting the central friction field formed by the control roller, increasing the longitudinal length of the friction field in the middle and rear area, making the gear shift move towards the middle jaw, concentrating and stabilizing, and the traction force in the back zone is larger than that in the V type curve drafting.

The draft area of draft VC should be selected according to the product quality requirements. weaving yarn The coarse section is easy to appear, and the draft ratio of the back zone should be larger. The knitting yarn is very sensitive to details, and the draft area of the back zone should be small.

The experiment shows that the small draft area with small spacing can achieve the purpose of concentrated drafting and improve drafting efficiency. However, the space of fiber finishing in the back area is limited, resulting in more details and easy fluctuation of quality, especially when spinning and knitting yarn.

Generally speaking, the front roller is punching 2 mm before, the upper and middle rollers move 2 millimeters, and the rear cots move back according to the technological size. The experimental results show that the position of the upper and middle rollers is adjusted from 48 mm to 47 mm, and the length of the yarns in the back area is increased, which is conducive to the straight parallel and dry improvement of the fibers, but the twisting triangle area is unchanged. Yarn hairiness Poor.

In order to reduce the hairiness, the front cots and the upper and middle rollers should be moved forward to 2 millimeters, so that the front rubber roller can reach 4 millimeters in front, keeping the length of the short floating area unchanged and reducing the twisting triangle area.

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Description: the project provides a leather making method using carbon dioxide supercritical fluid as the medium. The method includes using carbon dioxide supercritical fluid as a medium for leather degreasing, enzyme hair removal, softening, tanning, dyeing and fatliquoring. During the operation, the entrainer is basically not used, and the temperature is reduced to 33 degrees centigrade in the supercritical carbon dioxide fluid treatment process, the pressure is reduced to less than 9.0MPa, the processing time is reduced to 60 minutes, hardly use water, the energy consumption of leather processing is reduced, and it has huge economic, environmental and social benefits.

Cooperation mode: technology transfer

Unit name: National Engineering Laboratory of leather cleaning technology, Sichuan University