This passage summarizes the causes and solutions of weft breakage in rapier weaving machine. and points out that in production, when adjusting the equipment, attention should be paid to the coordination and synchronization of various parts. And it is also necessary to ensure that the movement of the left and right rapiers is adapted to the width of the fabric. If the process is too large or too small, it may cause weft breakage. Today we will discuss situation of weft breakage at the weft feeder.
1. Weft breakage at the rear tensioner of the weft feeder
This type of weft breakage is mainly caused by the unfavorable unwinding of the weft yarn and the poor quality of the weft yarn, which can be divided into the following situations.
First, the tube yarn is formed. The bobbin yarn is not well formed, the yarn cannot be smoothly released during unwinding, or the yarn hangs on the bobbin, resulting in the weft yarn being pulled. Solution: replace the well-formed bobbin. Some filament weft yarns have a smooth surface, and are easy to slip and fall out of the loop during unwinding, causing the weft yarn to be pulled off. Solution: Put a plastic bag or elastic sleeve on the bobbin to eliminate the unwinding balloon and yarn slippage.
Second, weft feeder, post tensioner and spindle position. The three are not in a straight line, and it is easy to cause bad balloons when the weft yarn is unwinding and hang the bobbin or tensioner. The distance between the weft feeder and the spindle should be moderate. Damage to the porcelain eye of the rear tensioner and damage to the bobbin can also easily lead to weft breakage.
Third, weft quality. Poor weft splicing and too many weak twists can easily cause end breakage during unwinding.
2. Weft breakage on the winding drum of the weft feeder
Poor weft joints and weak twists can easily lead to weft breakage. Solution: replace the quality weft yarn in time. The tension of the rear tensioner should be adjusted appropriately according to the actual production situation. Burrs on the winding drum of the weft feeder or deformation of the weft probe and damage to the yarn winding disc will cause the weft feeder to break during winding and unwinding of the yarn. The yarn drum can be repaired with fine sandpaper, and the deformed weft probe and damaged yarn winding disc can be replaced in time.
3. Weft breakage at the tension head of the weft feeder
The disc tension head adjusting spring is full of cotton dust, which may easily cause the tension head moving disc to be inflexible, resulting in weft breakage. It is necessary to clean the tension head adjusting spring in time, and at the same time select a suitable tension head spring to ensure proper weft tension. There are worn grooves or hairiness debris at the tension piece of the blade tension head, which will also cause weft breakage during weaving. It is necessary to replace and clean the tension head yarn clamping piece in time, and at the same time select the appropriate tension piece to ensure the appropriate weft tension
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