New USTER® STATISTICS data offers competitive gains

New USTER® STATISTICS data offers competitive gains

How spinners can improve quality consistency and get the most out of raw material.

Uster Technologies offers spinners valuable new insights into yarn quality optimisation, thanks to its unique combination of expert monitoring of market trends and comprehensive statistical analysis. For example, there is evidence that fibre elongation depends more on the type of cotton than on fibre length. And not all neps are the same: there are significant gains to be made from differentiating between seed coat and fibre neps.

Both these facts offer spinners potential for competitive advantages, arising from new data categories in USTER® STATISTICS 2018. This global benchmarking tool now includes revealing information about fibre elongation, as well as seed coat and fibre neps, and USTER explains how these can be exploited to improve yarn quality consistency.

Fibre elongation
In conjunction with fibre tenacity, fibre elongation influences yarn elongation and the processing behavior of the yarn, since higher values will typically perform better in the weaving mill. For this reason, it was obviously beneficial to include fibre elongation in the latest USTER® STATISTICS.

Analysis of USTER databases show that the correlation between fibre elongation and yarn elongation of a combed cotton ring yarn is at a level of 85 per cent. Although the twist multiplier and yarn production speed have a huge impact on yarn elongation, the basis for high yarn elongation actually comes from the fibre. The elongation of cotton fibre conclusively depends more on the type of cotton than the fibre length.

When engineering laydowns for yarn production, experts know which yarn parameters are influenced by certain fibre properties. It is possible to offset small deficiencies in one fibre property with an improvement in another. If a low fibre length might negatively affect yarn elongation and twist level, a slightly higher elongation in fibre could help.

Fibre elongation
In conjunction with fibre tenacity, fibre elongation influences yarn elongation and the processing behavior of the yarn, since higher values will typically perform better in the weaving mill. For this reason, it was obviously beneficial to include fibre elongation in the latest USTER® STATISTICS.

Analysis of USTER databases show that the correlation between fibre elongation and yarn elongation of a combed cotton ring yarn is at a level of 85 per cent. Although the twist multiplier and yarn production speed have a huge impact on yarn elongation, the basis for high yarn elongation actually comes from the fibre. The elongation of cotton fibre conclusively depends more on the type of cotton than the fibre length.

When engineering laydowns for yarn production, experts know which yarn parameters are influenced by certain fibre properties. It is possible to offset small deficiencies in one fibre property with an improvement in another. If a low fibre length might negatively affect yarn elongation and twist level, a slightly higher elongation in fibre could help.

Seed coat nep or fibre nep?
Ginning mills today increasingly focus on productivity rather than quality. At the same time, gins have not been upgraded to match the increased volumes of cotton. This suggests that a more accurate evaluation of cottons is now advisable for spinning mills. This can be achieved by assessing fibre neps and seed coat neps separately. The distinction between these two types of nep count is now possible in USTER® STATISTICS 2018 – and this allows more detailed analysis and new benefits compared with the previous data covering only the total nep count.

Firstly, the mill can optimize laydowns to manage a specific nep component. It can also optimize the specific nep removal efficiency. The spinner can even predict more accurately the level of white spots showing in fabrics made from the yarn after dyeing. A high level of fibre neps, with a high proportion of immature fibres, can cause these white spots. By analysing the fibre nep level at the laydown stage, mills can adjust their processes accordingly – for example by focusing on fibre nep reduction during carding.

With USTER® STATISTICS 2018, spinners are recommended to adjust card settings and compare the sliver data with the fibre nep processing chart, to benchmark the data against other mills. Combined with monitoring maturity, spinning mills can avoid or reduce white spots. If these are discovered during processing, the yarn can be redirected into a different application – such as bleached white t-shirts – where immature fibre neps are less disturbing.

Vital data, right instrument
Established in 1957, USTER® STATISTICS are a vital source of quality data for the textile industry and are now newly available as an app. The value of USTER® STATISTICS 2018 is acknowledged worldwide, allowing yarn producers and their trading partners to compare quality levels objectively against global market standards. Testing thousands of samples each year during past decades allows USTER unique market observations – enabling it to adapt the scope of the Statistics accordingly.

For testing and analyzing the critical fibre raw material parameters for cotton spinning, the USTER® AFIS PRO 2 is the right instrument. It operates with unmatched accuracy and speed to measure fibre neps, seed coat neps, short fibre content, fineness, maturity, trash and dust – all of which influence yarn performance in manufacturing. That’s why USTER® AFIS is the industry standard for process optimization in spinning mills – proven with more than 1,200 installations worldwide.

Optimal laydown recipe
The combination of textile know-how, current statistical data and advanced technology is the basis for consistent yarn quality, despite changing conditions and new trends. David McAlister, Product Manager Fibre Lab, Uster Technologies, says: “We could consider the laydown mixes used in yarn spinning as a ‘recipe’ and fibre quality parameters as the ‘ingredients’. We would then aim to adjust the ingredients to keep consistency in the recipe.

With USTER® STATISTICS 2018, we can determine the relationship of fibre properties to yarn properties and from that we can learn how to adjust the ingredients of the recipe for optimal performance. This is important for cotton, as it is not always possible to obtain the same or similar fibre qualities year-in and year-out.”

USTER is the world’s leading provider of quality management solutions from fibre to fabric. Uster Technologies offers high-technology instruments, systems and services for quality control, prediction, certification and optimization in the textile industry. This includes systems for quality management, laboratory testing and in-line process control for fibres, staple and filament yarns, fabric inspection as well as value-added services. USTER provides the globally-acknowledged USTER® STATISTICS benchmarks for trading, textile know-how training, consulting and worldwide after-sales services – always aspiring to fulfill the textile market’s needs, to drive innovation forward with ‘quality in mind’. Uster Technologies AG is headquartered in Uster, Switzerland and operates worldwide. It has sales and service subsidiaries in the major textile markets and Technology Centers in Uster (Switzerland), Knoxville (USA), Suzhou (China) and Caesarea (Israel).

BOX:
The new USTER® NEWS BULLETIN No. 51 covers more trends in more detail under the title ‘USTER® STATISTICS 2018 – The industry’s quality language enters a new dimension’. (Free download available at www.uster.com/unb51.) Readers will also find the section on `What’s New´ in USTER® STATISTICS 2018 very informative.

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