Descrizione principale (Inglese)

The so called "blue jeans" were invented in the far 1873 and remain modern nowadays. Their quality is determined by the properties of the fabric and that of the seams. The quality of the seam depends on many factors, one of which is the coefficient of friction between the fabrics that influences the slippage of the layers each to other during the sewing process. The value of the friction coefficient depends on the material used, the linear density and the twist of the warp and weft threads, the weave, the density of the threads, and the finishing treatment. In order to increase the friction forces between the fabric layers, a pressure by means of a presser foot is exerted on them. Abstract:The study is carried out for denim fabrics made of 100% cotton in twill weave. The static and dynamic coefficients of friction before and after finishing at different pressure levels are determined. Key words: Static and dynamic coefficients of friction, Denim fabrics, Finishing, Seam quality