Importance

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Abstract

The present disclosure relates to a method of manufacturing a high-strength sheath-core type synthetic fiber and high-strength sheath-core type synthetic fiber manufactured thereby, the method including forming a fiber by melt-spinning a thermoplastic polymer of a sheath component and a core component through a spinning pack including a sheath-core type bicomponent spinning nozzle; performing a heat treatment by allowing a molten fiber to pass through a heating zone disposed directly below the spinning nozzle during the melt-spinning; cooling the heat-treated fiber; and drawing the cooled fiber, wherein the sheath component includes a resin including the sheath component having elongation viscosity and thermal conductivity lower and specific heat higher than those of a resin included in the core component, and an ultra-fine high-strength synthetic fiber satisfying predetermined strength or higher as compared to a fine diameter and intrinsic viscosity may be provided.

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First Claim