Abstract
This research analyzed the drying of a fabric blend of polyester and cotton. The equipment consisted of a copper plate, heated by a thermostatic bath. The operating conditions varied between 40 and 85ºC, with 0.5 to 2.5 m s-1 drying air velocity. In each temperature, tests were conducted on samples with humidity between 0.7 and 1.0. Using the mass of the samples obtained in every weighting, the drying curves and drying rate curves were obtained. The equilibrium isotherms were evaluated using the dynamic method, by means of Novasina equipment; samples were exposed to salts with relative humidity varying between 11 and 98%, with temperatures between 50 and 20ºC. The results were fitted to mathematical models available in literature, determining parameters that better identify the drying model .
Highlights
A produção de matéria-prima têxtil em grandes escalas e a utilização de variadas fibras trouxe, ao homem, liberdade na escolha de suas roupas e flexibilidade de produção
This research analyzed the drying of a fabric blend of polyester and cotton
The equilibrium isotherms were evaluated using the dynamic method, by means of Novasina equipment; samples were exposed to salts with relative humidity varying between 11 and 98%, with temperatures between 50 and 20oC
Summary
Foram avaliados os modelos da literatura mais comumente utilizados para o tratamento dos dados das curvas generalizadas da cinética de secagem: Page (1949), Equação 1 e Overhultz et al (1973), Equação 2 e Motta Lima et al (2002), Equação 3. Sendo TSN a taxa normalizada, X a umidade da amostra, e as constantes do modelo a1 e b1 determinadas a partir do ajuste dos dados experimentais. Onde TSG representa a taxa de secagem generalizada, X é a umidade da amostra, e as constantes do modelo a2, b2 e c2 foram determinadas a partir do ajuste dos dados experimentais. Na Tabela 1 são apresentados alguns modelos matemáticos encontrados na literatura que foram utilizados no ajuste de dados experimentais de vários materiais. O módulo experimental utilizado na secagem do tecido e apresentado na Figura 2 consiste de uma placa de cobre aquecida por meio de um banho termostático com temperatura controlada, a qual variou de 40 a 85oC
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