A method of manufacturing a high-strength synthetic fiber utilizing high-temperature multi-sectional drawing, two-stage high-temperature multi-sectional drawing, or multi-stage high-temperature multi-sectional drawing. The method comprises the following steps: performing, on a synthetic resin, melt spinning or melt extrusion, cooling, multi-sectional high-temperature drawing, heat setting and a fiber surface treatment, wherein the multi-sectional high-temperature drawing comprises independently adjusting temperatures at a front section and a rear section of an furnace, and the temperature at the rear section is higher than that at the front section. The temperature adjustment is performed on different locations in the furnace and according to a crystallization orientation of a fiber molecular chain, significantly increasing fiber strength. The method is widely applicable to manufacturing of various types of fibers, enhancing application performance of the fibers.

Disclosed herein is an apparatus for manufacturing a biodegradable thread including: a thread supply unit for supplying a biodegradable thread; a cog forming unit for forming cogs on the outer surface of the biodegradable thread supplied by the thread supply unit; and a cog axially deforming unit for axially deforming the cogs of the biodegradable thread, which has the cogs formed by the cog forming unit, with respect to a virtual central line of the biodegradable thread.

Disclosed herein is an apparatus for manufacturing a biodegradable thread including: a thread supply unit for supplying a biodegradable thread; a cog forming unit for forming cogs on the outer surface of the biodegradable thread supplied by the thread supply unit; and a cog axially deforming unit for axially deforming the cogs of the biodegradable thread, which has the cogs formed by the cog forming unit, with respect to a virtual central line of the biodegradable thread.

Disclosed is an an apparatus for forming cogs on a surgical thread, comprising: a bobbin having a suture thread wound thereonto; first and second tension rolls for maintaining, at regular tensions, the suture thread unwound from the bobbin; a pair of friction rolls for drawing the suture thread and allowing the suture thread to pass through so as to be discharged through an outgoing side; a tension plate operating up and down, for temporarily fixing the suture thread being discharged through the outgoing side by the friction roll; and a cog-forming knife for forming cogs by rotating and simultaneously moving forward toward the suture thread fixed by the tension plate and also obliquely moving to the left or the right so as to make oblique cuts on the surface of the suture thread.

Disclosed is an an apparatus for forming cogs on a surgical thread, comprising: a bobbin having a suture thread wound thereonto; first and second tension rolls for maintaining, at regular tensions, the suture thread unwound from the bobbin; a pair of friction rolls for drawing the suture thread and allowing the suture thread to pass through so as to be discharged through an outgoing side; a tension plate operating up and down, for temporarily fixing the suture thread being discharged through the outgoing side by the friction roll; and a cog-forming knife for forming cogs by rotating and simultaneously moving forward toward the suture thread fixed by the tension plate and also obliquely moving to the left or the right so as to make oblique cuts on the surface of the suture thread.