Influence of cocoon cooking conditions on variation of cocoon filament exfoliation tension.

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  • TAKABAYASHI CHIYUKI
    Research Team of Filature Engineering, National Institute of Sericultural and Entomological Science
  • NAIK SUBHAS VENKAPPA
    Central Silk Technological Research Institute, Central Silk Board
  • TSUBOI HISASHI
    Research Team of Filature Engineering, National Institute of Sericultural and Entomological Science

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Other Title
  • 繭の煮熟状態が繭糸の解じょ張力変動に及ぼす影響
  • Influence of cocoon cooking conditions

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Abstract

The influence of cocoon cooking conditions on the cocoon filament exfoliation tension has been studied using cocoons from Indian and Japanese bivoltine hybrids. It was observed that the cocoon cooking conditions had a significant influence on the cocoon filament exfoliation tension. The exfoliation tension of undercooked cocoons was observed to be higher than that of moderately cooked cocoons and overcooked cocoons. A similar trend was observed also with the influence of cocoon cooking conditions on the moving standard deviation of exfoliation tension of cocoons from both Indian and Japanese bivoltine hybrids. Furthermore, changes in filament exfoliation tension from outer layers to inner layers were analysed. The occurrence of abnormal increase in exfoliation tension (due to hard agglutination points) was decreased from outer layers to inner layers in the case of Indian bivoltine hybrids CSR10×CSR11, whereas it was increased from outer layers to inner layers in the case of Japanese hybrid. This may be attributed to the racial characteristics of cocoons, spinning conditions and sericin.

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