PURPOSE: To obtain a bobbin which is tough and free from the generation of deformation and breakage, and permits the repetitive use in a number of times.
CONSTITUTION: A bobbin 1 has a double layer structure consisting of an inner layer 2 and an outer layer 3, and each of the inner layer 2 and the outer layer 3 has a thermosetting resin structure which is formed by winding a cloth sheet formed from the thread shaped fiber bundles or fibers, as strengthening member. As the outer layer 3, is used the cellulose group fiber having the excellent surface working performance, as strengthening member, while as the material for the inner layer 2, the high strength and high modulus fiber such as glass fiber and carbon fiber is used as the strengthening member for securing the strength necessary for bobbin.
TAJIMA ISAO
YOKOI YUKIHIRO
SOUWA KASEI KK
ASAHI ORGANIC CHEM IND
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