Análises técnica e energética da secagem combinada no processamento de casulo do bicho-da-seda de Bombyx Mori L
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Data
2007-12-17
Autores
Cunha, Roberval Modesto da [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O processo de secagem do casulo de bicho-da-seda (Bombyx mori L.) é de suma importância, visto que, além de impedir a eclosão e perfuração do casulo, pela mariposa, executar a desnaturação sericínica e dar condições adequadas para o armazenamento, tem como prioridade manter a qualidade dos fios e teor de seda, proporcionando resistência no processo de desenrolamento, e atuar também, como um conservador do valor comercial da fibra. Com o objetivo de racionalizar a energia consumida durante o processo de secagem, sem comprometer a qualidade final do produto, realizou-se uma análise de viabilidade do processo de secagem combinada (alta e baixa temperatura) de casulos de seda, tendo como referência a secagem convencional em alta temperatura. O experimento foi realizado na Fiação BRATAC S/A, situada na cidade de Duartina-SP, e os tratamentos testados foram: a) secagem convencional, em alta temperatura, em secador multi-correia, modelo Yamato de 10 degraus (esteiras); b) secagem combinada com a fase de alta temperatura durante os primeiros 30minutos; c) secagem combinada com a fase de alta temperatura durante os primeiros 60minutos; d) secagem combinada com a fase de alta temperatura durante os primeiros 90minutos. A fase de baixa temperatura, na secagem combinada, foi conduzida em protótipo até atingir teor de umidade de equilíbrio. As variáveis de qualidade analisadas foram o rendimento do fio a partir do peso médio do casulo e o índice obtido no teste de “Kaijyo”. Ao final, realizou-se, ainda, uma análise comparativa entre os consumos energéticos de cada sistema de secagem. Os resultados indicaram melhor qualidade e desempenho para os tratamentos que utilizaram a secagem combinada, com a fase dos 60 minutos iniciais de alta temperatura da secagem convencional
The process of silkworm cocoon Bombyx mori L. drying is of substance importance. Not only it impedes the cocoon appearance and perforation by the moth, executes sericinical denaturation, and offers appropriate conditions for the storage, but also its priorities are to maintain the threads and silk tenor quality, to provide resistance in the unrolling process, and to act as the fiber commercial value preserver. With the objective of rationalizing the energy consumed during the drying process, without committing the product final quality, we carried on a combined drying process (high and low temperature) viability analysis of the silk cocoons, using as a reference the conventional drying in high temperature. The experiment was performed at Fiação BRATAC S/A, located in the city of Duartina, São Paulo, Brazil, and tested treatments were: a) conventional drying in high temperature with multi-belt dryer, model Yamato of 10 steps (matting); b) combined drying with high temperature during the first 30 minutes; c) combined drying with high temperature during the first 60 minutes; d) combined drying with high temperature during the first 90 minutes. The phase of low temperature in the combined drying was driven in prototype until reaching balance moisture content. Quality variables analyzed were the thread output from the cocoon medium weight and the obtained index on Kaijyo test. At the end, we also performed a comparative analysis between energy consumptions of each drying system. The results indicated better quality and performance for treatments that used combined drying with high temperature during the first 60 minutes
The process of silkworm cocoon Bombyx mori L. drying is of substance importance. Not only it impedes the cocoon appearance and perforation by the moth, executes sericinical denaturation, and offers appropriate conditions for the storage, but also its priorities are to maintain the threads and silk tenor quality, to provide resistance in the unrolling process, and to act as the fiber commercial value preserver. With the objective of rationalizing the energy consumed during the drying process, without committing the product final quality, we carried on a combined drying process (high and low temperature) viability analysis of the silk cocoons, using as a reference the conventional drying in high temperature. The experiment was performed at Fiação BRATAC S/A, located in the city of Duartina, São Paulo, Brazil, and tested treatments were: a) conventional drying in high temperature with multi-belt dryer, model Yamato of 10 steps (matting); b) combined drying with high temperature during the first 30 minutes; c) combined drying with high temperature during the first 60 minutes; d) combined drying with high temperature during the first 90 minutes. The phase of low temperature in the combined drying was driven in prototype until reaching balance moisture content. Quality variables analyzed were the thread output from the cocoon medium weight and the obtained index on Kaijyo test. At the end, we also performed a comparative analysis between energy consumptions of each drying system. The results indicated better quality and performance for treatments that used combined drying with high temperature during the first 60 minutes
Descrição
Palavras-chave
Bicho -da-seda, Casulos, Casulos- secagem
Como citar
CUNHA, Roberval Modesto da. Análises técnica e energética da secagem combinada no processamento de casulo do bicho-da-seda de Bombyx Mori L. 2007. viii, 71 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Ciências Agronômicas de Botucatu, 2007.