| Project/Area Number |
02041035
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Institution | Shinshu University |
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Principal Investigator |
SHIMIZU Fukashi Faculty of Textile Science and Technology, Shinshu University. Professor, 繊維学部, 教授 (80021145)
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| Co-Investigator(Kenkyū-buntansha) |
紀 濤 中国科学院, 大連化学物理研究所, 副研究員
孫 雲嵩 中国科学院, 大連化学物理研究所, 副研究員
IIZUKA Eisaku Faculty of Textile Science and Technology, Shinshu University. Professor, 繊維学部, 教授 (70021128)
JI Tao Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Associate Pro
SUN Yun Song Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Associate Pro
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| Project Period (FY) |
1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1990: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Wild silkworm in China / Antheraea yamamai / Antheraea pernyi / Physical property / Photo-yellowing / Yellowness index |
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| Research Abstract |
Antheraea yamamai silkworms are mainly raised in Mudanjiang, Heilongjing Province. They lack in a tolerance to diseases, posing a problem to solve this. The cocoons produced are reeled by farmers by hands and annual production of raw silk is only 40-50 kg. China takes up 80% of the world production of Antheraea pernyi cocoons, of which Liaoning Province accounts for another 80%. The amount of production in China was 76,000 tons in 1980 and 35,000 tons in 1985, showing a tendency to decrease annually. The cocoons produced are reeled with multiends reeling machines under the direct management of government. The present aims of study are prevention of the photo-yellowing of thread and breeding of varieties producing a white cocoon.
A. yamamai thread is about 30% shorter in a Chinese variety than in a Japanese variety. Besides, the green color typical of this species is less brilliant in the former and the Chinese variety appears to compare unfavorably with the Japanese variety in quality. There are not much difference in mechanical properties and fibrous structure between the two varieties ; things are same also in A. pernyi thread, which appears to show no difference in quality between a Japanese variety and a Chinese variety (Blue No. 6) except that the latter is again shorter by some 40% and in contrast to A. yamamai thread.
Effects of treatment with a few metallic salts or an acrylic resin on the prevention of yellowing of A. pernyi cloths by ultraviolet rays were evaluated by means of the yellowness index (Y. I.). Cu (II) was effective against the 365-nm ray and diminished the Y. I. by 4.4 for 200-hr irradiation, but was not effective against the 254-nm ray. Both of Co (II) and Ni (II) were not effective. The Y. I. for cloths grafted with methacrylamide decreased by 8.1 against the 254-nm ray after 200-hr of irradiation in comparison with that for similarly irradiated ungrafted cloths although the grafting itself increased the Y. I. from 5 to 10.
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