YARN TENSION WHILE KNITTING TEXTILE FABRIC

摘要

Yarn tension in looms is a value defining intensity of formation process, structure of knitted fabric. Increased value of yarn tension before it enters knitting area causes a spiraling number of breaks and decreased value causes troubles for the process of lapping the yarn under the needle of the loom. Tension of yarns before they enter knitting area include its tension when going off the bobbin and additional tension arising by virtue offrictlonal forces between yarns and surfaces of guiding and working components of the loom having the torus form. It is very difficult to determine yarn tension in the loom within the area of textile fabric formation from experiments. It's appropriate to apply recursive approach and to determine tension within the threading areas in the loom from going off the bobbin to knitting area. Our work presents experimental research of interaction between different in their nature natural, synthetic and artificial yarns and spun yarn and surfaces in the form of torus, simulating surfaces of the yarn guides, yarn break detectors, needles and push downs of the looms with two types of tacking: an umbrella tacking, which is placed above knitting area: a tacking which is placed on the floor. As a result of the experiment the regression dependences were obtained between tension and guide curvature radius, contact angle and tension of yarn and spun yarn before the guide in the form of torus. Consistent application of regression dependences data allows determining tension of yarn and spun yarn within the knitting area for different types of natural yarns, for wide range of looms.