Classification and breakage of fine yarn breaks

The broken ends of the spun yarn can be divided into two types: the yarn breakage before the yarn formation and the yarn breakage after the yarn formation. Before the yarn forming, the broken yarn refers to the broken yarn before the output from the front jaw, that is, the feeding portion and the drafting portion, and the main reasons are: roving broken, empty roving, whisker running out of the collector, collection Blockage, apron in the apron, filament winding roller and roller. After the yarn is formed, the broken yarn refers to the breakage of the yarn section from the front roller output to the bobbin during the twisting and winding process. The reason is that the twisting winding mechanism is abnormal (such as the spindle vibration). ), jump tube, wire ring flying ring, abnormal shape of the air ring (too large, too small or helium ring), poor operation, blockage of the suction tube or low vacuum, poor temperature and humidity control. In addition, when the yarn strength is decreased and the strength unevenness rate is increased due to fluctuations in the properties of the raw materials, unreasonable process design, and poor semi-finished structure, the number of broken ends may also increase.

Under normal conditions, there are fewer broken ends before yarn formation, and the production is mainly broken after yarn formation. The law of breakage after yarn formation is as follows:

(1) The distribution of broken ends in doffing is generally the largest for small yarns, the second for large yarns, and the lowest for medium yarns. The part with more broken ends is the beginning of the empty tube and the formation of the bottom of the tube, which is about to complete the winding large diameter position and the large diameter winding of the large yarn.

(2) The part with more broken ends after yarn formation is in the spinning section (called the upper broken head), and there is less occurrence in the break between the bead ring and the bobbin (called the lower broken head). However, when the steel collar and the traveler are not properly matched, it will cause the vibration, wedge, wear, burnout, flying loop, etc. of the traveler, and also increase the lower break. There is very little chance that the broken head will occur in the balloon part. Only when the steel collar is declining and the diameter of the wire ring is biased, the sliver will be excessively impacted by the convexity of the balloon, and the sliver may be broken or broken.

(3) Under normal production conditions, most of the flaws do not break in a doffing, and only repeated breaks occur on individual spindles, which is caused by a sudden change in spinning tension due to poor mechanical condition.

(4) As the spindle speed increases or the package increases, the spinning tension also increases, and the breakage generally increases.

In addition to the above rules, changes in climate and temperature and humidity will also cause large-scale breaks in the workshop. In addition, when the cotton adjustment and the properties (length, line density, grade, etc.) of the fiber vary greatly, if the process parameters are not adjusted in time, the breakage is also increased.



Square Grate

Neodymium Hopper Magnet,Permanent Hopper Magnet,Neodymium Magnet

Yongze Magnet Co., Ltd. , http://www.nb-magnets.com