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Abstract(s)
A presente dissertação foi desenvolvida na Continental Mabor - Indústria de Pneus, SA., localizada em Lousado, em parceria com o ISEP – Instituto Superior de Engenharia do Porto. Os objetivos deste trabalho foram a análise e a otimização da adesividade de materiais no processo produtivo de pneus. Os materiais estudados foram a cinta têxtil e a parede do pneu. Para cada um dos materiais foram criadas novas receitas no âmbito de encontrar a combinação que permitisse um menor valor de adesividade para a cinta têxtil, e um maior valor de adesividade para a parede do pneu. Testaram-se também condições de operação da capstrip, onde se obtêm as cintas têxteis. Para cada um destes testes foram retiradas e transportadas amostras para o Laboratório de Matérias-primas e Materiais em Processamento, onde foram determinados os valores de adesividade num equipamento próprio. Para a cinta têxtil, avaliou-se o material A e o material B, com diferentes receitas do composto B00163. A criação de novas receitas do composto teve como objetivo diminuir a adesividade do mesmo, e para isso alterou-se a quantidade de borracha, de agentes de vulcanização e de cera antiozonante. No entanto, nenhuma dessas alterações teve um impacto significativo na diminuição da adesividade. Relativamente às condições de operação da capstrip conclui-se que, o valor de pressão da bomba de engrenagem que permite maior estabilidade entre posições e boa impregnação de borracha é de 220 bar. O aumento da temperatura de arrefecimento do material, provoca a diminuição do valor de adesividade. Verificou-se também que quanto maior a velocidade do parafuso da extrusora, maior é o valor de adesividade do composto e do material têxtil. O local de armazenamento do material e o tempo que permanece sem ser utilizado também influenciam a adesividade. A adesividade do material dentro do parque refrigerado permanece relativamente constante, mas fora do parque e mais de 2 dias, diminui significativamente. Conclui-se que o fator tempo provoca o envelhecimento do polímero, provocando uma alteração nas suas propriedades. Relativamente ao composto de parede, R00218, foram testadas novas receitas onde se variou a quantidade de cera em cada uma delas. O composto com maior adesividade foi obtido nas condições atuais de produção, com 2,5 pphr de resina alifática C5 e 2,5 pphr de resina fenólica. Conclui-se que as resinas fenólicas são as mais eficazes a aumentar o valor de adesividade dos compostos.
The present dissertation was developed in Continental Mabor – Tires Industry, localized in Lousado, and with a partnership with ISEP – Instituto Superior de Engenharia do Porto. The main goal is the analyses and optimization of the tackiness of some materials in the productive process of tires. The studied materials were the capplies and the sidewall of tires. For each one, were created new recipes to find a combination that would allow the lower tackiness value for textile capplies, and the higher for the sidewall. Capstrip operating conditions were also tested, where capplies are produced. For each of those tests, samples were removed and transported to Raw materials and process materials Laboratory, where this parameter is measured. For the textile capply, it has been evaluated two different materials, A and with the B00163 compound, which does not contain tackiness promoters. In a first stage, it has been created new recipes where the quantity/type of rubber and vulcanization agents/waxes were changed. For each of those variations the impact on the decreasing of the tackiness is almost insignificant. Also, the operation conditions were evaluated. About the pression of the gear pump, the best situation it´s when is working at 220 bar where the value of tackiness is more stable between positions, and there is a good impregnation of rubber in the textile. About the cooling temperature of the material, whenever the increasing of that value, the value of tackiness decreases. Concerning about the velocity of the screw of the extruder, the higher value increases the tackiness. The place where the material is stored can have influence on the tackiness results. When the material is stored in a cooling area, the tackiness stays almost constant. However, if it´s stored more than 2 days outside that area, the tackiness decreases a lot. So, the time causes the aging of the polymer, which changes their properties. About the sidewall compound, R00218, it has been created new recipes where it has changed the quantity of resins. The compound with the higher value of tackiness is the one used in normal production, with 2,5 pphr of aliphatic C5 and 2,5 pphr of phenolic resin. Those are the most powerful in increasing the tackiness results of the materials.
The present dissertation was developed in Continental Mabor – Tires Industry, localized in Lousado, and with a partnership with ISEP – Instituto Superior de Engenharia do Porto. The main goal is the analyses and optimization of the tackiness of some materials in the productive process of tires. The studied materials were the capplies and the sidewall of tires. For each one, were created new recipes to find a combination that would allow the lower tackiness value for textile capplies, and the higher for the sidewall. Capstrip operating conditions were also tested, where capplies are produced. For each of those tests, samples were removed and transported to Raw materials and process materials Laboratory, where this parameter is measured. For the textile capply, it has been evaluated two different materials, A and with the B00163 compound, which does not contain tackiness promoters. In a first stage, it has been created new recipes where the quantity/type of rubber and vulcanization agents/waxes were changed. For each of those variations the impact on the decreasing of the tackiness is almost insignificant. Also, the operation conditions were evaluated. About the pression of the gear pump, the best situation it´s when is working at 220 bar where the value of tackiness is more stable between positions, and there is a good impregnation of rubber in the textile. About the cooling temperature of the material, whenever the increasing of that value, the value of tackiness decreases. Concerning about the velocity of the screw of the extruder, the higher value increases the tackiness. The place where the material is stored can have influence on the tackiness results. When the material is stored in a cooling area, the tackiness stays almost constant. However, if it´s stored more than 2 days outside that area, the tackiness decreases a lot. So, the time causes the aging of the polymer, which changes their properties. About the sidewall compound, R00218, it has been created new recipes where it has changed the quantity of resins. The compound with the higher value of tackiness is the one used in normal production, with 2,5 pphr of aliphatic C5 and 2,5 pphr of phenolic resin. Those are the most powerful in increasing the tackiness results of the materials.
Description
Keywords
Adesividade Compostos de borracha Materiais têxteis Cinta têxtil Parede do pneu Tackiness Rubber compounds Textile materials Textile Capply Sidewall of tires