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Development of super - jumbo cocoons of the silkworm for thick cocoon filaments

Research Project

Project/Area Number 01860009
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field 蚕糸学
Research InstitutionKanto Junior College

Principal Investigator

ITO Toshio  Kanto Junior College, Professor, 初等教育科・科長, 教授 (50168358)

Co-Investigator(Kenkyū-buntansha) OKANO Toshihiko  Gunma - ken Cocoon - Inspection Center, Researcher, 研究員
HAMANO Kunikatsu  Tokyo Noko University, Department of Agriculture, Assistant Professor, 農学部, 助教授 (60015089)
IWANARI Yoshitaka  Tokyo Noko University, Department of Agriculture, Honorary Professor, 農学部, 名誉教授 (40014899)
Project Period (FY) 1989 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1991: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1990: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1989: ¥3,100,000 (Direct Cost: ¥3,100,000)
KeywordsCocoon / Silkworm / Cocoon filament / Raw silk / Juvenile hormone / Amino acid / Artificial diet
Research Abstract

The size of cocoon filament is approximately 2.5 deniers in many of the current silkworm races. The present study was undertaken in order to obtain thick cocoon filaments and, using them, to produce silk textile of characteristic feeling.
It was found that the suitable condition for obtaining jumbo cocoons was cutaneous application of 20-100 mug juvenile hormone per larva to the, one-day-old 4th-enstar larvae reared on artificial diets. Thus, the span of the 4th instar was elongated, the weight of the newly-ecdysed 5th-instar larvae increased, and finally jumbo cocoons were obtained. For instance, the size of cocoon filament of jumbo cocoon obtained after the application of juvenile hormone ranged from 4.6 to 4.7 deniers in a specific silkworm race which produced usually thick cocoon filament(ca. 3.8 deniers).
Subsequently, many silk threads of 27 deniers were reeled using various types of cocoons of different races, respectively, and their physical properties were examined. As a result, the rate of elongation of silk thread became large, the strength of silk per unit size of filament became small, and its Youngs modulus became small, when thick cocoon filaments were used as materials for silk threads. In other words, when large size of cocoon filament was used, the silk thread of high flexibility was produced, and an advantage was also recognized in the physical properties as a thick silk thread.
Furthermore, using a number of jumbo cocoons, raw silks of 27 deniers were reeled. Exactly a hundred threads of the raw silks were yarned in doubling, twisted into a S-twist, and degummed. Then a knitting(Tenjiku)was made using the silk threads thus obtained. This knitting was superior to the usual goods in several respects, and according to the opinions of the fabric maker and the specialist of quality estimation the nature of those silk threads could be appreciated as textile materials for new goods.

Report

(4 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 浜野 国勝,鈴木 治雄,岩成 義才: "生理活性物質投与による太繊度生糸の試作" 東京農工大学農場研究報告.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 浜野 国勝,岡野 俊彦,伊藤 智夫: "繭糸繊度と生糸物性との関連について" 日本蚕糸学雑誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ito,T.and Inokuchi,T.: "Nutritive effects of asparagine and glutamine on the silkworm,Bombyx mori." 関東短期大学紀要.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] HAMANo, K., SUZUKI, H. and IWANARI, Y.: "Production of thick cocoon filament by applying physiologically active substance to silkworm larvae."

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] HAMANO, K., OKABE, T. and ITO, T.: "Relationship between size of cocoon filament and physical properties of raw silk."

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] ITO, T. and INOKUCHI, T.: "Nutritive effect of asparagine and glutamine on the silkworm, Bombyx mori."

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 浜野 国勝・鈴木 治雄・岩成 義才: "生理活性物質投与による太繊度生糸の試作" 東京農工大学農場研究報告.

    • Related Report
      1991 Annual Research Report
  • [Publications] 浜野 国勝・岡野 俊彦・伊藤 智夫: "繭糸繊度と生糸物性との関連について" 日本蚕糸学雑誌.

    • Related Report
      1991 Annual Research Report
  • [Publications] Ito,T.and Inokuchi,T.: "Nutritive effects of asparagine and glutamine on the silkworm,Bombyx mori." 関東短期大学紀要.

    • Related Report
      1991 Annual Research Report

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Published: 1989-04-01   Modified: 2019-02-15  

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