In the manufacture of staple fibre yarns, twist is inserted into the fine strand of fibres to hold the fibres together and impart the desired properties to the twisted yarns. Without twist, the fine strand of fibres would be very weak and of little practical use. A change in the level of twist also changes many yarn properties, such as strength and softness.
Study of Twist in spinning Twist in yarn Introduction of twist in yarn Definition of twist: Or, Twist is the measurement of spiral turns given to a yarn in order to hold the constituent fibers or threads together.
Twist binds the fibers together and contributes strength to the spun yarn. The number of twist affects yarn and product performance and yarn cost.
To hold the staple fibers together. To improve dynamometric properties tenacity, elongation, modulus of elasticity and regularity. To reduce the tendency of textured yarns to rotate on their own axis and to form loops The following four parameters are of importance when discussing twist in yarn: In addition to the amount of twist in a yarn, the direction of the twist is also designated.
There are two types: When a yarn is twisted in a clockwise direction, the fibers from a helical angle at the yarn surface.
Z -twist is more common for weaving yarns. When a yarn is twisted in an anticlockwise direction, the fibers from a helical angle at the yarn surface. In textile practics, it is customary to have Z-twist for warp yarns and S-twist for weft yarns. The twist level degree of twist in a yarn is the number of turns of twist per unit length.
The amount of twist varies with fiber length, yarn size, and its intended use.
Let the yarn diameter be D unit and let be the length of yarn occupied by one complete turn of twist. Then, The greater the diameter of the yarn, the larger is the angle produced by on turn of twist. Calculate the twist angle of a spun cotton yarn twisted to give a twist factor of 7.
By an expression known as the twist factor or twist multiplier.
Twist multiplier is an empirical parameter that has been establish by experiments and practice that the maximum strength of a yarn is obtained for a definite value of K. It is directly proportional to the tangent of the twist angle. Value of twist factor differs with each count system. A combed cotton yarn Ne 50, has a twist of per meter.
What is the English twist factor?Sewing with a twist—yarn, that is! No, there isn’t a machine sewing needle with a giant eye that lets us sew with yarn (yet), but there are several ways you can incorporate yarn into your work. Couching: Stitch over beautiful yarns and let their twisted strands show through the stitching.
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