The Journal of Silk Science and Technology of Japan
Online ISSN : 1881-1698
Print ISSN : 1880-8204
ISSN-L : 1880-8204
Volume 14
Showing 1-32 articles out of 32 articles from the selected issue
  • Zuobing FAN, Akira SUNOU, Naotatsu ONO
    2005 Volume 14 Pages 3-8
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
    The current situation of Japanese fiber industry is becoming severely more and more because of the rapid increase of import and the change of purchasing action of the consumers. Therefore the fiber industry is in recession for a long time and the total scale of the industry is reducing more and more. In addition, the production of silk textiles & fabrics is in the same trend now. Thus, policies for survival are groped for zealously by the people in each textile production area. Then, in this article did we pay our attention to Yonezawa city in Yamagata, which constituted a traditional textile production area, aiming at clarifying the present conditions and problems of the production area concerned. So an investigation was carried out in winter of 2003. As a consideration result, Yonezawa production area is a medium production area among all the textile production areas in Japan and the scale of the fiber industry is in a trend of retreating. The textile production area has two sections such as kimono section and women's clothes section. Women's clothes section is the main force from the amount of production, but the kimono and small articles are also being produced and the area is changing to produce small amount of multi articles. The circulation of the products is becoming a distribution channel for many divergences. It also can be pointed out that the successor problem and independence strengthening of the companies are the problems that the Yonezawa is facing with.
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  • Zuobing FAN, Akira SUNOU, Naotatsu ONO
    2005 Volume 14 Pages 9-16
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
    Japanese fiber industry is in the critical situation because of the rapid increase of import. The silk industry is also in the similar retreat. The main reason can be pointed out that (1) the sharp increase of the second processed silk products, (2) demand reduction of Japanese Kimono because of the change of the lifestyle. Especially by the reason of the latter, it falls into a severe situation in the production area such as Nishijin, Kiryu and Hakata, which are called the Japanese three major Obi material production areas. Thus, based on the silk vision new grope was carried out aiming at the future in these production areas. Therefore, I paid my attention to Hakata in this report aiming at clarifying the development of the productive structure of the production area concerned and progressing strategy in the future. It can be known clearly that in this production area the production scale is still in a gradual downward tendency. However, the number of employees and the amount of production showed a slight increase tendency in recent years. The production system also changed from the obi material production to a system of producing small amount of multi articles including obi and other accessories. The strategy for the future can be pointed out that (1) effort to make more new original articles and (2) reinforcement of sharing information between Hakata and other production area, should be done all the time.
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  • Lun BAI, Hu GU, Qilong SUN, Chuanxia Di, Jianmei XU
    2005 Volume 14 Pages 17-22
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
  • TAKEO KOUZU
    2005 Volume 14 Pages 23-28
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
  • Haruo KINOSHITA, Masayo IIZUKA, Hisaya WATASE, Ken-ichi NAGAYASU, Eiic ...
    2005 Volume 14 Pages 29-36
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
    The database on the preserved silkworm races those have been maintained as the genetic resources by National Institute of Agrobiological Sciences is presently disclosed on the Website as follows: In Japanese; http://ss.nises.affrc.go.jp/nisesDB/bombygen/tablemaster.html, in English; http://ss.nises.affrc.go.jp/nisesDB/bombygen/tablemaster-eng.html. This database is configured with a hierarchical tree structure. It is troublesome to find the target characteristic races. So, the retrieval function was added to supplement the faults and to make correspond quickly. Some database softwares which have retrieval function on the Web are on sale. But we did not use these database softwares for providing security of the private server. The program function was added on the retrieval system configured with HTML by using JavaScript.
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  • Majibur Rahman Khan, Mikihiko Miura, Masaaki Okajima, Taiki Fujiwara, ...
    2005 Volume 14 Pages 37-44
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
    Seriplane tests have played an important role in classifying the quality of raw silk since the early days of raw silk testing. However, the introduction of machine-based quality inspection has been strongly desired by users of raw silk who are not satisfied with the seriplane tests which depend on judges' personal feelings. In this paper, two probability models were applied to seriplane evenness tests to consider the statistical property of the tests. Under the first model, the probability of test panels judged as Evenness Variation II or III was evaluated. The results revealed the fundamental relationship between the seriplane evenness tests and the size deviation of raw silk. In the second model, the probability of stripes appearing in a seriplane panel was assessed. Computer simulation was carried out to verify the theoretical results.
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  • G. Hariraj, Subhas. V. Naik, S. Roy, T. H. Somashekar
    2005 Volume 14 Pages 45-52
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
    The influence of rotary traverse mechanism speed, reel speed and number of cocoons to be reeled for the production of web structured bulky raw silk has been studied using Box-Behnken response surface design. The hot air dried multi-bivoltine cocoons (PM × NB4D2 race) treated at different rotary traverse mechanism speed, reel speed and number of cocoons to be reeled for the production of bulky raw silk have been found to have significant influence on reeling characteristics, viz. bulkiness (diameter) and productivity and on quality characteristics, viz. average size, size deviation and tenacity of web structured bulky raw silk. However, the other process parameters viz., renditta, waste generated during reeling, maximum size deviation and elongation of bulky raw silk did not have significant influence on production of web structured bulky raw silk. The study clearly shows that the based on the rotary traverse mechanism speed, reel speed and number of cocoons different qualities of web structured bulky raw silk with different productivity levels and bulkiness could be produced using inferior quality multi-bivoltine cocoons.
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  • AKIO NAGURA, SHOJI URITA
    2005 Volume 14 Pages 53-60
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
    In order to produce characteristic outstanding silk, while making the Sekaiichi × Chu 515 and examining many characters of the silkworm, quality of cocoon and mechanical properties of the raw silk further manufactured from the cocoon was analyzed. Although the stable production of cocoon which reduced rearing labors more was possible for this silkworm races in the all rearing season and many characters were low compared with the commercial silkworm race, the characteristic of the raw silk was rich in elasticity, softly flexible, could not become wrinkles easily, and had the performance which is excellent also in durability. In addition, a silk material of the singularity which has a wild silkworm taste rather than the usual domesticated silkworm was also shown.
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  • Part I: Effect of cocoon cooking condition and reeling speed on reeling performance of Indian bivoltine hybrid cocoons
    Subhas V. Naik, T. H. Somashekar
    2005 Volume 14 Pages 61-65
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
    The influence of cocoon cooking condition and reeling speed on reeling performance of bivoltine hybrid cocoons has been studied. Study has been conducted using two cooking methods viz. single pan and pressurised, and nine levels of reeling speeds from 50mtrs/min to 210mtrs/min. It is observed that as the reeling speed increases reelability and raw silk % are found to decrease significantly. Slow speed reeling and pressurized cooking method give better reelability and raw silk recovery, whereas high speed reeling particularly with open pan cooking affect reelability and raw silk recovery significantly. It is also observed that as the reeling speed increases thread troubles are found to increase significantly. Results indicate that cooking of the cocoons to the required level and maintaining the reeling speed of 80∼120m/min are essential for achieving better reeling performance with optimum production from CSTRI multiend reeling machine.
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  • Part II : Influence of cocoon cooking condition and reeling speed on quality characteristics of raw silk of Indian bivoltine hybrid cocoons
    Subhas V. Naik, T. H. Somashekar
    2005 Volume 14 Pages 67-72
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
    The influence of cocoon cooking condition and reeling speed on quality characteristics of raw silk has been studied for Indian Bivoltine hybrid cocoons. Study has been conducted using two cooking methods viz. single pan and pressurised, and nine levels of reeling speeds from 50mtrs/min to 210mtrs/min. Neatness, cleanness, tenacity elongation and cohesion of raw silk have been found to be significantly better in the case of pressurized cooking as compared to open pan cooking. It is observed that as the reeling speed increases elongation, neatness, cleanness of raw silk decrease significantly, where as tenacity and cohesion of raw silk are found to increase. Results indicate that slow speed reeling and pressurized cooking method give better quality raw silk, whereas open pan cooking method and higher reeling speed affect the quality of raw silk significantly. Results indicate that cooking of the cocoons to the required level and maintaining the reeling speed of 80∼120m/min are essential for producing better quality silk with optimum production and better profit from CSTRI multiend reeling machine.
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  • Xu Huixiang, Wang Jianmin, Hideaki Morikawa
    2005 Volume 14 Pages 73-79
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
  • Wanchun FEI, Lun BAI
    2005 Volume 14 Pages 81-85
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
    In order to categorize size series of cocoon filament (SSCF), which are non-stationary time series with finite length in terms of mean and auto-covariance, by means of the time varying parameter auto-regressive (TVPAR) model theory, statistical methods of learning and recognition were used to extract the characteristics of size series of cocoon filament. Through learning the size series, using closed data, the rates of correct recognizing which of two cocoon categories a given size series of cocoon filaments belongs to were 96.95% and 98.72% for a single series and the mean of two series, respectively. The rate of correct recognition was higher after suitable filtering. The theory and method can be used to analyze other types of non-stationary time series with finite length.
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  • Wanchun FEI, Lun BAI, Hideaki MORIKAWA, Mikihiko MIURA
    2005 Volume 14 Pages 87-91
    Published: 2005
    Released: August 04, 2006
    JOURNALS FREE ACCESS
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