Thesis Details


Thesis Title: The testing of cryogenically treated rings and travelers versus conventional rings and travelers
Thesis Author: Charles B. Jenkinson, Jr.
Abstract: In recent years ring spinning has achieved many technological advances. However, productivity increases are limited by the ring and traveler combination. Heat sensitive synthetic fibers are limited to lower speeds than that of 100 percent cotton because the frictional heat buildup results in melting of thermoplastic fibers at high speeds. Rings and travelers exhibit greater wear at higher speeds which results in poor yarn quality. Another aspect of increased speeds is that the life of the ring and traveler is reduced, and as wear increases, so does the amount of friction between the ring and traveler. Conventional rings require a break-in period which means that time has to be spent changing travelers. Yarn imperfections also occur during the break-in cycle resulting in problems downstream. A new cryog.enic treatment for rings and travelers is now available w•h ich could reduce or eliminate some problems associated with the conventional ring and traveler. This treatment is claimed to increase the life of the traveler; thus, the wear problems are reduced, ends-down rates are reduced, and break-in of rings is eliminated. In order to validate these claims, the treated ring and traveler was compared to the conventional ring and traveler for spinning performance and yarn quality. Spinning performance included such parameters as traveler wear and thermal damage to 100 percent polyester fibers. Yarn quality was assessed by the conventional yarn testing procedures. Comparisons between the two ring and traveler types were made for three different designed experiments. These experiments were to assess the possible improvements for the ring break-in, increased wear resistance, and increased speeds for 100 percent polyester and 100 percent cotton yarns. Results of the spinning performance indicated that the conventional traveler exhibited increased wear as time progressed. However, the treated traveler actually lost more weight during the earlier time intervals than the latter time intervals. It was also found that the treated traveler had greater variability associated with the inches to break tbe traveler using the Instron load tester than the conventional traveler. No detectable thermal damage could be found for either of the ring and traveler combinations.