THE BEHAVIOUR OF THE 2:2 RIB STRUCTURES MADE OF 100% COTTON YARNS, NM 40/1, AFTER KNITTING PROCESS

Abstract

Researches made on the 2:2 rib structures have demonstrated that for obtaining knits with maximum dimensional stability it is necessary that in their structure to be introduced tensions with the lowest values, structures to balance dimensionaly from the relaxation phase after knitting, and the dimensional modifications on the stitch course direction and stich course in vertical direction to be minimum. It is well-known that the 2:2 rib structures are relatively unstable form dimensional point of view due to the rib platinum loop, in a different plan from the two plans of the knit, and also due to the small number of thread-thread contact points with consequences on the relatively high sliding of the yarns in the structure. The influence of the technological knitting process is imposed by the correlation of the processed yarn characteristics, together with the technical characteristics of the knitting machines, with the technological parameters of knitting operation and with the structural parameters of knitted fabrics which are to be obtained. The study concerns the dimensional changes of the 2:2 rib structures during relaxation after knitting. The dimensional changes are analyzed in their complexity, both on the stich course direction and also on the stich courses in vertical direction, proposing a mathematical model for the study of these changes. Key words: 2:2 rib structure, dimensional stability, relaxation of the knits, technological parameters of the knitting operation

Keywords

• 2:2 rib structure
• dimensional stability
• relaxation of the knits
• technological parameters of the knitting operation