Investigation of the parameters of yarns sized by the prewetting process

Abstract

The paper compares the pre-wet sizing process to the standard sizing process. On the basis of the performed treatments and investigatios all the advantages as well as disadvantges of the new sizing process are discribed. Sizing was done using PVA size with a concentration of 7.5 %. Materials used in this research are ring-spun cotton yarns with counts of 20, 30 and 50 tex, on which for the purpose of the sizing procedure relevant physical mechanical yarn properties were tested by standard methods. Sizing increases yarn strength and abrasion resistance, and reduces yarn hairness, affecting the reduction of warp yarn breaks in the weaving process as well as the increase in weaving machine efficiency and finished fabric quality. The values of the tested sized yarns, regardless of the sizing procedure, do not deviate significantly, meaning that the new sizing procedure has an advantage due to the saving of sizes and energy. The results obtained confirm that the new pre-wet sizing process is a really efficient technological process which can contribute to savings of sizing agents, water, energy and environmental protection without any consequences for the quality of the sized yarn.