| 摘要 |
Production of an extremely fine biodegradable filament from a biodegradable filament, such as polylactic acid or polyglycolic acid, by simple means without the need to use a special high-precision high-level apparatus. There is provided a process characterized in that a biodegradable filament is heated by infrared luminous flux and the heated starting filament is drawn to 100 times the length or more by a tensile force of <=10 MPa so that an extremely fine filament having undergone a high molecular orientation whose size is <=12 mum, generally 2 to 3 mum is obtained. |
