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In this study, the interaction between POY (Partially Oriented Yarn) polyester yarn's number of nips and knitted fabrics' thickness values were investigated. For this aim, polyester POY filaments with 283 dtex linear density and 100 filaments in cross section were used as raw material. POY bobbins were intermingled at different process conditions (speed and pressure) hence yarns having five different numbers of nips were produced. Single jersey knitted fabrics were produced using these yarns on the circular knitting sample machine. The produced fabrics' samples were prepared on the basis of TS 7128 EN ISO 5084 test standard and the thickness of fabric measured by using digital thickness gauge FD 200/ 25 tester. The interaction between the number of nips and knitted fabric thickness were analyzed statistically and results were interpreted. [ABSTRACT FROM AUTHOR]