Conjugated yarn and fiber reinforced plastic

Abstract

A conjugated yarn is provided which is capable of preventing a high-tenacity fiber used therein from being ruptured during a weaving or knitting process. The conjugated yarn includes: core yarns each having a high-tenacity fiber and a reinforcing fiber positioned parallel with the high-tenacity fiber for reinforcing the high-tenacity fiber; and a tying yarn bundling the core yarns. Also provided is a fiber reinforced plastic of which the strength and safety are improved by the use of the conjugated yarn.

What is claimed is:  
     
         1 . A conjugated yarn comprising: core yarns each comprising a high-tenacity fiber and a reinforcing fiber positioned parallel with the high-tenacity fiber for reinforcing the high-tenacity fiber; and a tying yarn bundling the core yarns.  
     
     
         2 . The conjugated yarn according to  claim 1 , wherein the high-tenacity fiber comprises a plurality of high-tenacity monofilaments.  
     
     
         3 . The conjugated yarn according to  claim 1  or  2 , wherein the reinforcing fiber comprises a plurality of reinforcing monofilaments.  
     
     
         4 . The conjugated yarn according to any one of  claims 1  to  3 , wherein the reinforcing fiber has a higher resistance to flexural fatigue than the high-tenacity fiber.  
     
     
         5 . The conjugated yarn according to any one of  claims 1  to  4 , wherein the reinforcing fiber has a higher tensile elongation at break than the high-tenacity fiber.  
     
     
         6 . The conjugated yarn according to any one of  claims 1  to  5 , wherein the tying yarn has a higher tensile elongation at break than the high-tenacity fiber.  
     
     
         7 . The conjugated yarn according to any one of  claims 1  to  6 , wherein the tying yarn is wound around the core yarns.  
     
     
         8 . The conjugated yarn according to any one of  claims 1  to  6 , wherein the tying yarn is braided around the core yarns.  
     
     
         9 . The conjugated yarn according to any one of  claims 1  to  8 , wherein the high-tenacity fiber comprises a carbon fiber.  
     
     
         10 . The conjugated yarn according to any one of  claims 1  to  9 , wherein the high-tenacity fiber comprises a glass fiber.  
     
     
         11 . The conjugated yarn according to any one of  claims 1  to  10 , wherein the high-tenacity fiber comprises a ceramic fiber.  
     
     
         12 . A fiber reinforced plastic comprising a cured product comprising a reinforcing fiber material formed of a conjugated yarn as recited in any one of  claims 1  to  11 , and a resin matrix impregnating the reinforcing fiber material.