Twist Tester - TNG1091

The TNG1091 Twist Tester is designed to determine the twist coefficient of yarns, which indicates the degree of twist applied during manufacturing. The instrument operates by clamping one end of the test sample in a moving gripper and the other end in a rotating gripper under standardized pre-tension. The sample is then rotated at a specified speed until it untwists. The process is repeated to measure the twist coefficient. The TNG1091 supports testing according to ASTM D1422, BS 2085, and ISO 2061. It is suitable for single and plied yarns, including S and Z twist types. The instrument features adjustable test lengths up to 500 mm and includes an inching function for efficient operation. The touch screen displays test results in TPI or TPM. The test methods include direct counting, untwist/re-twist, and three-times untwist/re-twist procedures. The machine is powered by 220/110 V at 50/60 Hz and has a length of 880 mm. The TNG1091 is equipped with an auto stop and reverse function for conventional or untwist/re-twist testing methods.

The Twist Tester is used to get the coefficient of twist, which is a measurement of the level of twist of the yarn and is suitable for testing single or plied yarns. Besides, it is equipped with auto stop & reverse for conventional or untwist/re-twist methods. Therefore, yarn twist testing is an easy task for textile testing labs or factories by applying the instrument.

Twist tester offers adjustable test lengths up to 500mm/20 inches for S & Z twist yarns, and the inching function helps the operator to get an esteemed twist quickly. Moreover, the touch screen can directly show the test result in TPI / TPM.

The test principle

The instrument carries out the specimen test driven by the CPU management. One end of the test sample is clamped in the jaws of the moving gripper while the other end is in the jaws of the rotating gripper under the standardized pre-tension. Then rotating the sample at a specified speed until it untwists. Next, twist the sample again. Finally, the moving gripper will be back to the original position instead of being in the original zero zones.

How to Measure the Number of Twists in Yarn?

• Touch screen
• 4 test methods Direct counting, untwist/re-twist, 3- times untwist/re-twist method, etc.
• Length of the specimen 0~500mm adjustable
• Twist speed 100 ~ 1900 rpm
• Yarn count range 1 ~ 499.9 tex
• Unit TPM / TPI
• Twist range10~4999
• Yarn pulling stand
• Wire pulling needle

The instrument carries out the specimen test driven by the CPU management. One end of the test sample is clamped in the jaws of the moving gripper while the other end is in the jaws of the rotating gripper under the standardized pre-tension. Then rotating the sample at a specified speed until it untwists. Next, twist the sample again. Finally, the moving gripper will be back to the original position instead of being in the original zero zones.

The importance of twist in the yarn The twist of yarn not only affects the yarn strength, but also the color accuracy after dyeing and the fluffy degree of cheese yarn. Therefore, it is advised that the rate of rewinding should be adjusted according to relatively high twisting in yarn to prolong the time of the cheese yarn dyeing process, which leads to a higher average speed of yarn dyeing. Hank dyeing is an important stage of the yarn dyeing process. A higher yarn twist will lead to more shrinkage under hot and humid conditions. Thus, it is of great importance to increase the linear density of a yarn. What is Twist in Yarn? Yarn twist is defined by the degree of tightness applied to the fiber and it is normally measured by the number of twists (1 twist is equivalent to 360° of traveled fiber) of unit length. Generally, the unit length for staple yarn is “10cm”, and the length ratio is