The Guide to Yarn Twist Tester



Twist refers to the number of turns of fibers twisting in a unit length of yarn. Twist affects not only the tensile properties of yarn but also its softness, stiffness, warmth retention, etc. Therefore, twist is an important indicator of the structural characteristics of the yarn.
Our product——Y331A is a device that can help you quickly and accurately measure yarn twist.
It uses an electric drive method to measure the twist of short-fiber single yarn, twisted multifilament, plied yarn, cable and other yarns. It can be tested using methods such as direct counting, untwist-retwist, double untwist-retwist, and triple untwist-retwist.
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Measure Principle

Method 1. Direct counting method: Under the specified tension, clamp the two ends of a certain length sample, rotate one end of the sample, and remove the twist of the yarn sample until the constituent units of the tested yarn are parallel. Calculate the twist of the yarn based on the number of revolutions required to remove the twist.
Method 2. Untwist-retwist method: It is an indirect method for measuring twist, which involves untwisting and retwisting the sample until it reaches its initial length. Assuming that the number of twists added is equal to the original twist of the sample, half of the twists number recorded on the counter represents the twists number of the sample.

Features of twist tester

Y331A-II Digital Reeling Twist Tester is used to determine the yarn twist of single or plied yarn by direct count or untwist-retwist methods.
Following are features of digital yarn twist tester:
  • Controlled by microcomputer, large-screen LCD displayer, support both Chinese and English menus by switch, and man-machine interactive dialogue operation;
  • With data storage function, when power off, you can view statistics values, and it can be connected to a printer to print out test report.
  • “zero” position is detected by optocoupler sensor to avoid “zero” shift caused by Hall sensor.
  • right sample gripper is derived from a high-performance direct-drive stepper motor; rotational speed can be arbitrary preset to avoid the problems of brush wear and spark interface, which is caused by DC motor completely.
  • Add the pre-tension in a horizontal direction.

 

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