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61	Varia??o de temperatura e umidade e suas influ?ncias nas caracter?sticas f?sicas e mec?nicas dos fios de algod?o Souza, Clara Silvestre de 03 October 2011 (has links) Made available in DSpace on 2014-12-17T14:58:22Z (GMT). No. of bitstreams: 1 ClaraSS_DISSERT.pdf: 3432218 bytes, checksum: 7e008670903eeebdf6b98724b154b050 (MD5) Previous issue date: 2011-10-03 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Cotton is a hydrofilic textile fiber and, for this reason, it changes its properties according to the environment changes. Moisture and Temperature are the two most important factors that lead a cotton Spinning sector and influence its quality. Those two properties can change the entire Spinning process. Understanding this, moisture and temperature must be kept under control when used during the Spinning process, once the environment is hot and dry, the cotton yarns absorb moisture and lose the minimal consistency. According to this information, this paper was developed testing four types of cotton yarns, one kind of cotton from Brazil and the others from Egypt. The yarns were exposed to different temperatures and moisture in five different tests and in each test, six samples that were examined through physical and mechanical tests: resistance, strength, tenacity, yarn?s hairness, yarn?s evenness and yarn?s twisting. All the analysis were accomplished at Laborat?rio de Mec?nica dos Flu?dos and at COATS Corrente S.A., where, it was possible to use the equipments whose were fundamental to develop this paper, such as the STATIMAT ME that measures strength, tenacity, Zweigler G566, that measure hairiness in the yarn, a skein machine and a twisting machine. The analysis revealed alterations in the yarn?s characteristics in a direct way, for example, as moisture and temperature were increased, the yarn?s strength, tenacity and hairness were increased as well. Having the results of all analysis, it is possible to say that a relatively low temperature and a high humidity, cotton yarns have the best performance / O algod?o ? uma fibra t?xtil hidr?fila e por essa raz?o muda suas caracter?sticas em fun??o das condi??es do ambiente. A umidade e a temperatura s?o dois fatores que influenciam o ambiente de uma fia??o de algod?o. Estes dois fatores podem alterar a qualidade de toda uma produ??o de fios. Sendo assim, umidade e temperatura devem ser mantidas sob o controle para o processamento do algod?o, uma vez que em um ambiente seco e quente os fios de algod?o liberam umidade e se rompem, aumentando o ?ndice de quebra da fia??o com o ambiente frio e ?mido, os fios absorvem umidade e perdem a consist?ncia m?nima.Com base nessas informa??es, este trabalho foi desenvolvido experimentando quatro tipos de fio de algod?o sendo de origem brasileira e os demais, de origem eg?pcia. Os fios foram expostos a temperatura e umidade diferentes em cinco experimentos distintos, contendo cada experimento seis amostras que passaram por testes f?sicos e mec?nicos: resist?ncia, for?a, tenacidade, pilosidade, t?tulo e tor??o. As an?lises foram realizadas no Laborat?rio de Mec?nica dos Fluidos na Universidade Federal do Rio Grande do Norte e na empresa COATS Corrente S.A., onde foi poss?vel fazer uso dos equipamentos fundamentais para o desenvolvimento deste trabalho, tais como o STATIMAT ME que mede a resist?ncia, for?a e tenacidade do fio, Zweigler G566 o qual mensurou a quantidade de pilosidade no fio e, a meadeira e o torc?metro, respons?veis pelo t?tulo e tor??o. As an?lises revelaram altera??es nas caracter?sticas dos fios de forma diretamente proporcional, como por exemplo, conforme aumentava-se a umidade e temperatura havia um aumento da resist?ncia, for?a, tenacidade e pilosidade. Em posse desses resultados, ? poss?vel afirmar que a uma temperatura relativamente baixa e uma umidade alta, os fios de algod?o tem sua performance m?xima CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
62	Investigation into mechanics of yarn subject to high levels of axial torsion Belov, Eugene B. January 1999 (has links) No description available. 677
63	Modifications to a self-twist spinning machine designed to improve fabric appearance Hassanin, H. M. M. January 1982 (has links) No description available. 670 Twist insertion process][Yarn spinning
64	Thermomechanical responses of textured yarns. Smith, Steven Craig January 1978 (has links) Thesis. 1978. Sc.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Includes bibliographical references. / Sc.D. Mechanical Engineering Textured yarn Dyes and dyeing
65	An evaluation of fluorescent whiteners in 65/35 polyester/cotton fabric following exposure to selected laundry treatments and environmental factors Negri, Marie Elaine, 1928- January 1976 (has links) No description available. Textile fabrics. Blended yarn. Crease-resistant fabrics.
66	Determination of optimum draft distributions for combed cotton yarns Mahaffey, George Thomas January 1966 (has links) No description available. Textile fibers Testing Cotton yarn Testing
67	A study of the effects of varying break drafts at the drawing process on the physical properties of Arnel and combed cotton yarns Marvin, John Henry January 1960 (has links) No description available. Textile fibers, Synthetic Testing Triacetate Cotton yarn
68	Investigation of interference between knit-deknit yarn loops and fabric loops of plain weft knit fabrics Ronan, John Blair January 1976 (has links) No description available. Textured yarn Knit goods Machine knitting
69	A comparative study of the degree of perfection of cotton yarns Miller, John More 05 1900 (has links) No description available. Cotton yarn Cotton manufacture Quality control
70	The role of yarn structure on the hand related low-stress mechanical behavior of enzyme treated yarns by Jingwu He. He, Jingwu 08 1900 (has links) No description available. Enzymes Industrial applications Yarn Cellulose Mechanical properties

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