Due to the high running speed of the winding machine, the spun yarn bobbin is prone to delooping during unwinding. During the winding process, we found that the yarn path and wax absorption of the anti-hairiness nozzle of the tension box of some single spindles were There is a phenomenon of wire clogging near the mouth, which still occurs frequently after cleaning, and this phenomenon often occurs in a random manner. From this we can conclude that this phenomenon is caused by the spun bobbin decoupling. The yarn layer that deloops during winding passes through the pre-clearer along with the high-speed running yarn, passes over the yarn guide plate of the tension box, is sheared by the electric clearer, and then wound on the package yarn with the inertia of the upper yarn. In the process of repeatedly searching for yarn, the large suction nozzle may pull out a yarn from the mess of yarn, pass it through the electric cleaning test, and then twist it with the next yarn to continue winding, thus forming a mess of yarn in the package yarn.
Methods to solve the problem of spun yarn bobbin delooping
If the spun yarn bobbins of all machines are Delooping is likely to be a problem with the configuration of the spun yarn spinning forming process. Since the spun yarn bobbins are all conical cross-wound, the winding layer and the binding layer alternate with each other. The speed and stroke of the lifting and lowering of the steel ring plate have a negative impact on the spun yarn. The unwinding of the bobbin will have a great impact.
Generally, the cam lift ratio used in the spinning process is 1:2, and the stroke of the ring plate when winding the tube body is 46 mm (a ring with a diameter of 42 mm, The maximum diameter of the bobbin is 39 mm, and the lifting stroke L of the ring plate is about 46 mm). The winding density is designed based on the textile variety. Generally, the pitch of the yarn winding is 6 times the yarn diameter~ The 7-fold design can largely solve the problem of spun yarn bobbin delooping. In addition, if the tube bottom formed in order to increase the bobbin capacity is too full, it will also cause the spun yarn bobbin to deloop.
If an individual machine is decoupled, the cause can be found from the wear and tear of the molded cam transmission part, loose keys, etc. Some machines are caused by wear of the worm gear mechanism or gear teeth. The box is loose and the ring plate is checked to see if it is frustrated during operation. These are the main reasons for the spun bobbin to come out of the ring.
Due to the high speed during winding, coarse yarn decoupling is more serious. Stopping in the middle is also one of the reasons for the decoupling. Therefore, the parking position of the ring plate must be adjusted when stopping in the middle. To adjust the speed, the stopping position should be changed to the middle and upper part of the ascending stroke.
In order to reduce the number of doffing times of coarse yarns, the operation management of some factories will arbitrarily change the process of the forming part that has been loaded onto the machine, lowering the starting position of the ring plate, The bobbin weight is increased, resulting in severe delooping of coarse yarns.
In addition, in the spinning process, the yarn end is not coiled when replacing the traveler, the yarn ends appear when doffing, or the low speed operation time is too long after yarn spinning, and the yarn winding layer structure Not tight, these are some of the causes of spun yarn delooping.
In addition, the surface of the bottom of the spun yarn bobbin used earlier was too smooth or the grooves processed on the surface were too shallow, which caused the innermost yarn of the spun yarn bobbin to deloop. reason.
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