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Estudos de transferência de calor e massa em diferentes materiais de couro
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ISBN10: 6203168165
ISBN13: 9786203168167
Publisher: Edicoes Nosso Conhecimento
Published: Jul 9 2024
Pages: 112
Weight: 0.39
Height: 0.27 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786203168167
Publisher: Edicoes Nosso Conhecimento
Published: Jul 9 2024
Pages: 112
Weight: 0.39
Height: 0.27 Width: 6.00 Depth: 9.00
Language: Portuguese
O couro é um bem económico importante. O toque do couro decide invariavelmente a qualidade do couro. O ritmo e o modo de secagem alteram significativamente as propriedades fÃsico-mecânicas do couro. Tipicamente, no fabrico de couros húmidos com cerca de 70% de humidade, os couros são submetidos a uma operação mecânica de espremedura, samming, para remoção de água livremente retida antes de serem submetidos a processos de secagem convencionais para produzir couros com 15- 20% de humidade. São realizadas experiências para obter uma imagem clara de como a variável de secagem afecta as propriedades mecânicas dos couros secos. Um tempo de secagem mais curto e um teor inicial de água adequado são condições favoráveis para produzir couros mais fortes e mais macios. Foi explorada a possibilidade de utilizar a quantidade de massa, tal como a taxa de secagem, para generalizar a relação entre as variáveis de secagem e as propriedades mecânicas. A partir das experiências, pode concluir-se que através do processo de secagem a vácuo se pode obter couros mais fortes e mais macios, que terão alta resistência à tracção, resistência à fissura do grão e resistência à ruptura da lÃngua. Além disso, não sofreriam qualquer desgaste durante os processos de acabamento.
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