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Determination of yarn twist through electric twist tester (Direct Counting Method).

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Name of the Experiment: Determination of yarn twist through electric twist tester (Direct Counting Method). Introduction: Twist: Twist is the spiral arrangement of the fibers around the axis of the yarn. The twist binds the fibers together and also contributes to the strength of the yarn. The amount of twist inserted in a yarn defines the appearance and the strength of the yarn. The number of twists is referred to as turns per inch. Types of twist: 1. S - Twist 2. Z – Twist Twist Measurement in Yarn: The most obvious way to measure the number of twists per unit length of yarn is simply to untwist a known length of the yarn and check visually to see whether the twist has been completely removed. Method of twist Measurements: 1. Straightened fiber technique or the direct count method. 2. Twist contraction technique or the untwist and re-twist method. 3. Twist to break technique. 4. Microscopic Objectives: 1. To know how to determine the yarn twist. 2. To know about electric t
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Difference between rotor spinning and ring spinning frame

       Difference between rotor spinning and ring spinning frame Rotor Spinning frame Ring Spinning frame 1.Rotor spinning frame is modern spinning system machine 1.Ring spinning frame is conventional spinning system machine 2.The working speed of rotor spinning frame is faster than ring spinning frame. 2.The working speed of ring spinning frame is lower than rotor spinning frame. 3.Usually rotor spinning frame produced lower count yarn. 3.This machine can produce from low count yarn to high count yarn. 4.Basically the raw material of this machine is low quality. Means low grade cotton 4.Relatively this machine used high grade cotton to produce yarn. 5.Only one drafting system is available on this machine so there are no break draft in this machine 5.Darting system is split in two divisions called main draft and break draft. 6.Tw
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Determination of yarn count through Electric Wrap reel & Balance Method.

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Name of the Experiment: Determination of yarn count through Electric Wrap reel & Balance Method. Introduction: Yarn count: The yarn count is a numerical expression which defines its fineness or coarseness. It also expresses weather the yarn is thick or thin. A definition is given by the textile institute – “Count is a number which indicates the mass per unit length or the length per unit mass of yarn. A definition of yarn count is given by textile institute “Count a number indicating the mass per unit length or the length per unit mass of yarn”. Several systems and unit are used for expressing the yarn number. Depending on the material used for preparing the yarn. 1. Indirect system 2. Direct system 3. Universal system Indirect system: In this system the count is the number of units of length per unit of weight of yarn. In this case higher the count, finer is the yarn. This system is generally used for cotton, woolen, worsted linnet. Let N = the yarn Count or Number
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