Application Handbook_Uster_Statistics - Uster Technologies

Outlier types and their definitionsOutlier Type Abbreviation Limits DescriptionNSLT Outliers NSL (100%)T (65%)NSL outlier limit is set at 100%above the yarn bodyT Outlier limit is set at -65% ofthe yarn body.Outliers for neps, short thick, long thick andthin places (NSLT). The outlier limitdepends on the yarn body shape and maydiffer for various yarn types.FD Outliers FD (8%, 2cm) FD outlier curve passes throughthe point of intersection at 8%, 2cm.Outliers for colored foreign fibers (FD). TheFD outlier limit is fixed and applies to alltypes of yarns.VEG OutliersVEG (10%, 2.6 cm) VEG outlier curve is fixed andapplies to all yarn types. Thecurve passes the point ofintersection at 10%, 2.6 cm.Outliers for vegetable matter (VEG). TheVEG outlier limit is fixed and applies to allyarn types.PP Outliers PP (65%) PP Outlier limit is set at 65% ofthe scatter plot.Outliers for polypropylene fibers (PP). Theoutlier limit depends on the scatter plotshape and may differ for various types ofyarns.Quality OutlierTypeAbbreviation Limits DescriptionYarn evenness (CV m)(-16%, +20%)Mean Value (MV) – 0.16x MVMean Value (MV) + 0.20x MVOutliers for yarn evenness.The range is indicative for the CV m variationof the entire lot and the CV m values (100 myarn samples) ranged between these limits.Imperfectionoutliers forstandard classes:Thick places: +50 /Thin places: -50 /Neps: +200Imperfection(Standard) (3σ)Mean value (MV) of the standardimperfection classes ± 3 xstandard deviation (s).Outliers for imperfections (standardclasses).The range is indicative for the variation ofthe standard imperfection classes of theentire lot.An affected share value is shown where atleast one of the standard imperfectionclasses exceeded the -3σ or the +3σ borderlimits within the distribution.Imperfectionoutliers forsensitive classes:Thick places: +35 /Thin places: -40 /Neps: +140Imperfection(Sensitive) (3σ)Mean value (MV) of the sensitiveimperfection classes ± 3 xstandard deviation (s).Outliers for imperfections (sensitiveclasses).The range is indicative for the variation ofthe sensitive imperfection classes of theentire lot.An affected share value is shown where atleast one of the sensitive imperfectionclasses exceeded the -3σ or the +3σ borderlimits within the distribution.Hairiness outliersHairiness (H)(Mean Value ± 1)Outliers for hairiness.(-1.0, +1.0)The range is indicative for the Hairinessvariation of the entire lot and the H values(100 m yarn samples) ranged betweenthese limits.Affected Share Affected Share (%) The affected share gives the percentage(%) value of the length of the respectiveoutliers out of the entire sample test length.This value is an indicative of the share ofdefective yarn in the lot.Table 4-19USTER ® STATISTICS 28 (36)