All You Should Know About Pirn Winding - Trim Engineering Services

1. A pirn is a weft bobbin placed inside a shuttle for weaving fabrics. They differ from bobbins as bobbins are uniform in shape from one end to the other, while pirns are tapered at one end. Furthermore, bobbins are wound back and forth uniformly, while pirns are woven half inch at atime. Winding of a pirn is different from the regular process of winding any other bobbin. In pirn winding, the yarn is transferred from a larger package to the smaller pirn, without any inspection, meaning no availability of a yarn clearing zone. Also, the traverse mechanism is different. As mentioned above, the traverse does not go back and forth along the package; instead, it builds yarn on only one part of the package at a time. This method of winding reduces ballooning effects by maintaining uniform tension and reducing the possibility of slough-off. Just like there is a difference in the winding of pirns as compared to other bobbins, there is also a difference in the winding machines for both. Pirn winding machines can be manual or automatic. Both kinds of machines are suitable for winding cotton, wool, silk, nylon, and synthetic polyethylene fiber yarns. These machines have four spindles. Two machines can be joined together to have eight spindles, where each unit of four spindles and eight spindles can be driven individually. On the other hand, other bobbin winding machines like cop winding machines have four heads, which can wind four bobbins at the same time. There are clamps that can control the length of the yarn. Also, the shape and size of the bobbin can be easily adjusted. And, the most notable feature of such winding machines is that they are completely in auto-stopmotion.

2. For winding a pirn, the process needs to begin near the wide end of the pirn, with a couple of inches covered with one layer of thread, and then wound back and forth on the area. In this way, the winding gradually moves down the pirn towards the tapering end. This helps build up the yarn in a wedge shape. Also remember that it is important to wind a tight pirn to make a firm yarn package so that the yarn only unwinds evenly when it is pulled from the shuttle. And, when winding at the tapering end of the pirn, it is even more important that the layers are built firmly and evenly so that there is no danger of the yarn slipping off the end of thepirn. You can test the pirn by picking up the shuttle and pulling on the yarn. You should feel a resistance and it should slow and stop as you stop pulling. The tension needs tightening if the yarn pulls out without effort. If you feel that there is total control in the way the weft lies through the warp, the winding is justright. With awide variety of pirns available, you can get the best quality pirns at Trim Engineering Services, one of the leading pirn manufacturers inIndia. For more details, visit our website:http://www.trimengineering.in/