Increase Control Roller To Improve Evenness And Reduce Mao Yu

The VC type curve drafting of < p > < a href= "http:// www.91se91.com/news/index_c.asp > > ring spinning frame < /a > means that a control roller with a diameter of 8 mm ~10 mm is added in the back area on the basis of the V shaped curve drafting roller configuration in the back area, so that the curve drafting in the middle part of the back area develops into a control roller type. < /p >
< p > under the control roller, the pressure gauze generates contact encircling arcs, forming a strong additional friction field in the middle part of the back area, extending the encircling arc length of the yarn on the rear roller surface, extending the friction field of the rear roller around the arc, and connecting the middle 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 curve draft. < /p >
The draft area of < p > VC draft should be selected according to the product quality requirements. Generally, the coarse section of < a href= "http:// www.91se91.com/news/index_c.asp" > woven yarn < /a > 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 ratio of the back zone should be small. < /p >
< p > experiments show that small draft area with small spacing can achieve the purpose of concentrated drafting and improving drafting efficiency. However, there is limited space for fiber finishing in the back area, which results in more details and easy fluctuation of quality, especially when spinning and knitting yarn. < /p >
< p > generally speaking, < a href= "http://? www.91se91.com/news/index_c.asp" > front roller roller < /a > punching 2 mm, the upper and middle rollers move 2 millimeters, and the rear cots move back according to the technological dimensions. < /p >
< p > 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 parallel and dry improvement of the fibers, but the twist triangle area is unchanged and the yarn hairiness is poor. < /p >
< p > 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 before, and the length of the short floating area will be kept unchanged, so that the twisting triangle area can be reduced. < /p >