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Tenacity of Cotton Yarns Joined During the Rewinding Process

Rutkowski J.

Fibres & Textiles in Eastern Europe

2011

Vol. 19, no. 1 (84)

34-36

Great technological progress and the automation of spinning processes have caused that machines, most often arranged in streamlines, work better and more effciently. However, in spite of this advanced progress, it is impossible to produce yarns completely devoid of faults. Depending on the raw materials applied and the condition of machinery, there are places in yarn which do not correspond to the quality of yarn stream required. These are thick and thin places, as well as interwoven foreign fbres and contaminants. The last chance of eliminating such faults is the installation of a yarn quality monitoring device at the end of the spinning process, which would stop production when faults appear. The device will then remove the fault and join the yarn ends to create a continuous stream of twisted fbres. Such devices can be mounted on spinning and rewinding machines. This study contains an analysis of the strength parameters of cotton yarn knotless joints with linear densities of 20 and 25 tex, manufactured in both industrial and laboratory conditions. The yarns were rewound on a Schlafhorst Autoconer 338 rewinding machine. Then an assessment was made of the joints' strength received as a result of knotless joining with various adjustments of the splicer. The yarn tenacity before and after the rewinding was compared, and coeffcients of the utilisation of the joints' resistance in the yarn tenacity after rewinding were established.