In the production of hybrid silk (20 denier) , combining the false twisted nylon fiber with cocoon filaments without air jet, the authors examined the relationship between the combination of the factors like false twisted nylon's torque direction, croissure twist direction, jette-bout rotating direction and the yarn quality of hybrid silk. As a result, when the false twisted nylon is in S-torque direction and the croissure twist is Z-direction (left rotary direction) and the jette-bout rotation is S-direction (right rotary direction) , it was comfirmed that the combining degree of hybrid silk increases, the size deviation decreases, the eveness-deviation also decreases and in addition the percent of cleanness and neatness increase. Even, when the false twisted nylon is in Z-torque direction and the croissure twist is S-direction and the jette-bout rotation is Z-direction, the quality of hybrid silk increases as in the above case.

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  In order to develop an automatic testing equipment for cleaness and neatness defects, basic study has been done on the analysis of 2-directional data measured by laser sensors for measuring size in outside diameter and on the extraction of partial wave-forms corresponding to cleaness and neatness defects from the data. Mean value f(i) derived from the 2-directional data had an effect on extracting the wave-forms. Coefficient of variation on the data was able to be designed as a standard level to detect them.

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[in Japanese]

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  A study was carried out on the distribution characteristics concerning reeling thread troubles (here after called as failures) of an automatic silk reeling system, defining the time between failures as TBF and the time to repair as TTR.
  It was concluded that the distribution of TBF and TTR closely reflected the Weibull distribution and the characteristics of TBF and TTR distributions could be accurately expressed by the parameters of the said distribution function.
  It was also concluded that the graphical method of estimation for the parameters of Weibull distribution could be effectively and easily applied for analysing TBF and TTR, besides the method of maximum likelihood estimate or so by computer.

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[in Japanese]

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  The strength of silk increases when it is treated with tannic acid. Tannic acid absorbed in the non-crystalline part of silk helps in increasing the bonds between the molecular chains by their mutual interactions. The strength of silk fibers decreases when this treated silk was mordanted with ferrous sulphate. The break down of chains occured due to the mordanting.

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[in Japanese]

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