Wear resistance, as one of typical characteristics, is used for evaluating the durability of textile materials in use and their suitability for the intended purpose. In this paper the results of the Martindale method of wear of fabric intended for making protective and work clothing are presented. The fabric wear is done with sandpaper on a flat surface, at different cycles, by monitoring the changes in weight and by visual comparison. With the increase of the number of cycles of wear it can be seen that the percentage weight loss of samples increases due to uprooting of fibers from the surface, and also the damages can occur which can be seen in the intermittent occurrence of yarn breakage and holes in the fabric.

In the paper, a new method by which it is possible to define the crimping of the textured filament PES yarns is presented. The method is based on the flow analysis of the force-elongation function. POY multifilament polyester yarns, having the fineness of 167f36x1 dtex were analyzed. The texturing of PES multifilament yarns was performed using different first heater temperatures and maintaining the constant temperature of the second heater, then with different texturing speeds at the extension degree of 1.665 and at the ratio of the disc circumferential speed to yarn speed of 2.20. Moreover, the results were compared with the data obtained using standardized crimping testing method.

Mechanical properties of textured PES yarns depend on their structural characteristics and texturing process parameters. In this work, the results of breaking characteristics of textured PES yarns formed with various technological production parameters are presented. The samples of textured PES yarns were produced on a modern machine with a short heating zone. The textured yarn was formed at the first heater temperatures of 350 °C, 400 °C and 450 °C with the constant temperature of the second heater of 180 °C and with D/Y ratio of 2.20. The texturing speed was changed in the range of 500 m/min up to 1100 m/min with stretching degrees of 1.665, 1.675 and 1.685. The results obtained can be used for the selection of optimal production parameters of PES yarn at various texturing speeds. Also, the relationships which can be applied in industry for predicting breaking characteristics depending on texturing process parameters are presented.