1.Broken ends before doffing
Strictly speaking, because this kind of breakage exists before doffing, it can not be included in the calculation range of doffing head retention rate. However, the existence of this kind of breakage will also increase the actual number of short ends after doffing, and increase the workload of joint after doffing, so it should be paid great attention to. The broken ends before doffing are mainly the broken ends and empty spindles which are not picked up too late before doffing.
2 end breakage during automatic doffing
Improper setting of doffing parameters and poor operation of the equipment will cause end breakage in the process of doffing. For example, when doffing, the braided yarn is twisted, the yarn is pulled out from the steel ring, and the yarn end is not clamped by the yarn gripper.
3. Broken ends caused by poor yarn drawing and intubation during doffing
If the doffing parameters are not set properly and the equipment is in poor operation, some broken ends may be caused in the process of yarn drawing, such as yarn tail slippage, yarn out of the steel ring, tube yarn not pulled out, empty tube not inserted in place, etc.
4 after doffing, start to break the end
If the doffing parameters are not set properly and the equipment is in bad running condition, there will be more broken ends after doffing. The main reasons are that the starting speed of the steel ring does not match the output speed of the front roller, the starting thickness and fineness appear in the drafting area, the flying flower is attached, and the yarn braids are small.
