Application Handbook_Uster_Statistics - Uster Technologies

2.6 New Yarn Processing ChapterThis chapter serves as a guideline for evaluating possible changes of certain quality parameters frombobbins to cones. All the six quality parameters selected are shown one page in order to make thegraphs as user-friendly as possible. We have focussed on the most important quality parameters thatare measured in the laboratory. CV m , Thin-40%, Thick+35%, Neps+200%, H and Tenacity. Althoughwe are aware that the standard settings for thin places is -50%, we decided to calculate the deviationfor thin places of -40% instead. This is due to mathematical reasons, as the number of thin places isoften very small. Therefore, calculating the percentage difference of small numbers is not very helpfulfor the spinner, e.g. an increase from 2 to 4 thin places per 1000m. The percentage deviation is100%, although the absolute difference is statistically insignificant.Deviations are calculated based on the results of bobbins, which are considered as reference. Theresulting value is given in percentage. The following two examples are given in order to make thecalculation clearer:1. Nep count in bobbins: 100 / 1000m nep count in cones: 120 / 1000m Resulting deviation is +20%2. Tenacity in bobbins: 18 cN/tex Tenacity in cones: 17.5 cN/tex Resulting deviation is: - 2.7%2.7 New Raw Material for RovingThe following raw materials are new for the roving chapter:• 100% CO, compact, combed• 100% PES, ring• 100% CV, ring• 65/35% PES/CO, ring2.8 New Raw Materials and Yarn TypesWe were able to add the following new chapters and raw materials to the USTER ® STATISTICS 2013to provide the textile industry with a wider variety of raw materials and yarn types.2.8.1 New spinning process for the Fiber Processing chapterA new chapter has been introduced to the current version of the USTER ® STATISTICS in addition tothe existing fiber processing graphs for combed and carded ring-spun yarn as well as the OE-rotorspunprocessing graphs. The fiber processing parameters for the compact spinning process aredescribed in this chapter.USTER ® STATISTICS 6 (36)