During the weaving process of synthetic filaments such as nylon and polyester, it is easy to form a piece of wool near the heald frame and reed. Often, only a few of the dozens of single fibers in a multifilament are unbroken, while the others The fiber breaks like being cut by a knife. In severe cases, several multifilaments are “cut” together, forming a piece of wool, and winding and breakage occur.
The main reason for this phenomenon is that the raw material characteristics of synthetic fibers are high tensile strength but low shear strength . When the wool produced on one thread is twisted on another thread and the two threads are separated during the opening process, the wool is not easy to break due to its greater tensile strength, but the twisted fiber is cut due to shearing. Low strength and “snipped”. Especially for untwisted or low-twisted yarns, the cohesion between fibers is poor, and single filaments are easily “cut”. The cut fibers twist other fibers, so more single fibers are “cut”. If not processed in time, accumulation will occur. Into a piece of wool.
In order to prevent the hair from winding and breaking, it is necessary to try not to produce hair during the preparation process. Specifically, the following matters are required:
(1) Strictly control the processing tension of the silk thread, and ensure good shaping Under the premise, the processing tension of the silk thread should be slightly smaller. If there is a tension measuring instrument, you can use it to measure the tension and control it within the range of the process requirements. If there is no tension measuring instrument, press the filigree cylinder with your finger to make it It is advisable to leave a slight fingerprint. If the tension is too high, the thread will shrink due to loss of tension after processing, and the bobbin wall will prevent it from shrinking, resulting in a single fiber “cracking” phenomenon that is difficult to detect.
(2) The wire guide should be smooth and wear-resistant, and should be made of high-performance ceramic materials that are not prone to static electricity to avoid Fiber wear occurs during processing.
(3) On the premise that the sizing yarn is not sticky, the film must be good and it must withstand the healds and The friction between the reed teeth will prevent hairs from being produced.
(4) When weaving, appropriately increase the number of heald frames. According to actual production experience, if the density of the healds is greater than 8 wires/cm, it is very likely that hair will be produced due to the friction between the wires and healds, and between wires. If the number of heald frames is increased or double steel bars are used, the density of the warp wires can be reduced, thereby preventing the occurrence of warp wires. Wool silk. And the heald frames should be replaced regularly to prevent the warp wires from being “cut” due to rough heald wires.
(5) The weaving workshop should maintain a certain temperature and humidity to prevent the increase of wool due to static electricity generated by drying in the workshop. </p
