causes of hidden barshidden horizontal stripes refer to the phenomenon that the size of the coil changes periodically and the cloth surface is sparse and uneven during a cycle of machine operation. generally speaking, the raw materials are less likely to cause hidden horizontal bars. most of them are periodic tension unevenness caused by improper adjustment after mechanical abrasion, resulting in hidden horizontal bars.
causes
a. due to poor installation accuracy, or serious wear due to aging of the equipment, the level and concentricity deviation of the circular knitting machine needle cylinder exceeds the allowable tolerance. a common problem is that the gap between the positioning pin of the large transmission gear plate and the positioning groove of the machine frame is too large, which causes the needle cylinder to be not stable enough in operation, which seriously affects the yarn feeding and unwinding. in addition, due to the aging of the equipment, mechanical wear, the longitudinal and radial shaking of the main transmission gear plate increases the concentricity of the needle cylinder and the deviation, which causes the fluctuation of the yarn feeding tension, causes the size of the coil to be abnormal, and, in serious cases, hidden horizontal stripes appear on the fabric .
b. in the production process, the variable speed disc of the yarn feeding mechanism is embedded with foreign objects such as flying flowers in the adjustment slider, so that its roundness is affected, the speed of the synchronous toothed belt is abnormal, and the amount of yarn is unstable, which leads to the production of hidden horizontal stripes. .
c. the circular knitting machine is difficult to overcome the shortcomings of the large difference in yarn tension during the yarn feeding process, and it is easy to cause unexpected yarn elongation and the difference in yarn feeding amount, thereby forming hidden horizontal stripes.
d. the circular knitting machine adopts intermittent coiling mechanism, the tension fluctuates greatly during the coiling process, and the length of the coil is easy to produce differences.
