What are the advantages and disadvantages of using different types of twist testers and methods?

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Twist is one of the most important parameters that affects the quality and performance of yarns and fabrics. Twist determines the strength, elasticity, fineness, hairiness, abrasion resistance, and appearance of yarns. Therefore, measuring and controlling twist is essential for ensuring consistent and reliable textile products. However, there are different types of twist testers and methods that have their own advantages and disadvantages. In this article, you will learn about the main types of twist testers and methods, and how to choose the best one for your needs.

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Yash Trivedi

Former VP Marketing at The Yarn Bazaar | VJTI

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A.Rauf Razzak Ganatra

CEO / President, FABéXP AMERICAS / LIVINGUARD Tech Suiza / KASSIM DENIM Lider de ventas, Sustainable Lean…

1 Direct twist testers

Direct twist testers are devices that measure the twist directly by counting the number of turns in a given length of yarn. They can be manual or electronic, and they can have different mechanisms to hold, rotate, and mark the yarn. The advantages of direct twist testers are that they are simple, accurate, and easy to use. They can also measure both single and plied yarns, and different types of fibers. The disadvantages of direct twist testers are that they are time-consuming, require careful handling of the yarn, and may damage or alter the yarn structure.

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A.Rauf Razzak Ganatra

CEO / President, FABéXP AMERICAS / LIVINGUARD Tech Suiza / KASSIM DENIM Lider de ventas, Sustainable Lean manufacturing, Marketing, Chemical management & New Technologies.
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Direct twist testers are instruments used to measure the twist of yarns, threads, or fibers by directly counting the number of turns in a specified length. They come in two main types: 1. Manual direct twist testers: These are mechanical devices that require manual operation to rotate and measure the yarn. 2. Electronic direct twist testers are automated devices that use sensors & digital displays to measure & calculate the twist. Direct twist testers are used in textile labs, quality control departments, & research institutions to measure twist levels, monitor production consistency, & determine suitable twist for specific applications. They provide accurate & reliable measurements, helping to ensure the quality & performance of yarns.

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2 Indirect twist testers

Indirect twist testers are devices that measure the twist indirectly by using a property that is related to twist, such as diameter, density, or capacitance. They can be optical, mechanical, or electrical, and they can have different methods to scan, calibrate, and display the twist. The advantages of indirect twist testers are that they are fast, non-destructive, and suitable for continuous or online monitoring. They can also measure fine or coarse yarns, and different types of fibers. The disadvantages of indirect twist testers are that they are complex, expensive, and require calibration and adjustment. They may also have errors or limitations due to factors such as yarn tension, moisture, or color.

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3 Untwist-retwist method

The untwist-retwist method is a technique that measures the twist by untwisting the yarn until it is straight, and then retwisting it in the opposite direction until it forms a loop. The number of turns in the loop is equal to the twist in the original yarn. The untwist-retwist method can be done manually or with a device, and it can measure both single and plied yarns, and different types of fibers. The advantages of the untwist-retwist method are that it is simple, inexpensive, and versatile. It can also measure the twist direction and balance of the yarn. The disadvantages of the untwist-retwist method are that it is time-consuming, destructive, and inaccurate. It may also introduce errors or variations due to factors such as yarn tension, length, or twist liveliness.

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Neelakantan Subramanian

Consultant - Yarn Sourcing and Textile Quality Systems
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Untwist and twist method tester will giveca correct results and you can also measure thectwist contraction also. Again none of thectwsutctesting method will give thecaccurate TOI if the yarn coming out of ring frane.

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4 Twist contraction method

The twist contraction method is a technique that measures the twist by measuring the change in length of the yarn when it is twisted or untwisted. The change in length is proportional to the twist in the yarn. The twist contraction method can be done manually or with a device, and it can measure both single and plied yarns, and different types of fibers. The advantages of the twist contraction method are that it is simple, inexpensive, and non-destructive. It can also measure the twist liveliness and recovery of the yarn. The disadvantages of the twist contraction method are that it is slow, inaccurate, and sensitive. It may also have errors or variations due to factors such as yarn tension, diameter, or elasticity.

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5 Twist angle method

The twist angle method is a technique that measures the twist by measuring the angle between the fiber axis and the yarn axis. The angle is inversely proportional to the twist in the yarn. The twist angle method can be done manually or with a device, and it can measure both single and plied yarns, and different types of fibers. The advantages of the twist angle method are that it is fast, accurate, and non-destructive. It can also measure the twist distribution and uniformity of the yarn. The disadvantages of the twist angle method are that it is complex, expensive, and requires magnification and measurement tools. It may also have errors or limitations due to factors such as yarn fineness, hairiness, or cross-section.

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A.Rauf Razzak Ganatra

CEO / President, FABéXP AMERICAS / LIVINGUARD Tech Suiza / KASSIM DENIM Lider de ventas, Sustainable Lean manufacturing, Marketing, Chemical management & New Technologies.
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The twist angle method is a technique that measures the twist by measuring the angle between the fiber axis and the yarn axis. The angle is inversely proportional to the twist in the yarn, meaning that as the twist angle increases, the amount of twist in the yarn decreases, and vice versa. This method is used to measure the twist in yarns, particularly in textile manufacturing, to ensure that the yarn has the desired properties for its intended use.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Yash Trivedi

Former VP Marketing at The Yarn Bazaar | VJTI
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The final yarn is produced by drafting and twisting the fiber strand on a ring frame, with twist playing a crucial role in the yarn's end use. Therefore, accurately measuring the twists per inch (TPI) or twists per meter (TPM) is essential to ensure the yarn is suitable for its intended application. Different twist testers and methods offer advantages, such as precision and ease of use, but they also have drawbacks, like complexity or cost. It is vital to have a knowledgeable operator who understands the twist testing process to ensure accurate results.

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What are the advantages and disadvantages of using different types of twist testers and methods?

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1 Direct twist testers

2 Indirect twist testers

3 Untwist-retwist method

4 Twist contraction method

5 Twist angle method

6 Here’s what else to consider

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