Application Handbook_Uster_Statistics - Uster Technologies

Length & StrengthCharacteristics Abbreviation Unit DescriptionUpper Half MeanLengthUHML mm Upper half mean length = mean length by weight of the longer 50% offibersUniformity Index UI % Uniformity Index = length uniformity of the fibers.ML ⋅ 100= Uniformity IndexUHMLClassification of the length uniformity:Uniformity Indexvery low below 76low 77 – 79average 80 – 82high 83 – 85very high above 86Strength Str gf/tex Breaking force of the fiber bundle divided by fiber finenessAssessment of the fiber strength (without long staple):below 21 = very low22 to 24 = low25 to 27 = average28 to 30 = highover 30 = very highElongation Elg % Breaking elongation of the fiber bundleShort Fiber Index SF % Short fiber index = percentage of fibers shorter than ½ inch or 12.7mmSpinningConsistency IndexTable 4-1SCISpinning consistency index. A coefficient is calculated by means ofvarious quality characteristics by a multiple regression analysis. TheSCI used is calculated with the original formula provided by USTER.The main benefit of the SCI is a simplified selection of bales for apredetermined blend of fibers as well as the long-term check of theraw material blend.Fig. 4-1USDA-mode / FibrogramThe fibrogram is a non-endaligned staple diagram and is calculated from a randomly taken fiberbundle which is fixed in a measuring grip.USTER ® STATISTICS 13 (36)