BULETINUL INSTITUTULUI POLITEHNIC DIN IAI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Ia%i Tomul LVI (LX), Fasc. 4, 2010 SecŃia TEXTILE. PIELĂRIE BY This paper deals with two of the leading topics of the yarn quality characteristics: the consistency (by mean of evenness) and the yarn surface integrity (by mean of the hairiness). Part I of this paper will be describing the interpretation of the USTER® TESTER 4 report and available graphical representations in order to evaluate yarn quality and to prevent misunderstandings that can result in wrong decisions in knitting. !"#$ yarn, ring> spinning, rotor– spinning, consistency, surface integrity. %"#&’"% Assessment of the yarn quality is still based on the off>line technique measurements > through laboratory data systems, which contribute to the automatic and integrated data control in spinning mills [1]. The yarn’s proper quality can be reached only if the quality of the raw material, the high performance of the processing equipment, the quality of the labor and the overall management allow it. Every quality issue referable to the spinning has side consequences in fabrics and also, on the customer feedback [2], [3]. Having in account the revolutionary manufacturing in the spinning mills, for long lasting supply, it was redefined the yarn quality as a combination of four basic elements: the consistency (yarn evenness and appearance integrity by mean thick places, thin places and neps), the bulk integrity (count, density and twist), the surface integrity (hairiness, diameter and shape) and finally but not less important, the purity (foreign fibers, seed coat, trash and dust) [4],…,[ 6]. 1 This is the full version of the paper, presented at ISKA 2010, Volume of Abstracts