Composite fiber, composite board, and method for manufacturing the composite board

Abstract

Provided are a composite fiber and a composite board. The composite fiber is composed of a core and a shell formed around the core, a melting temperature of the shell is lower than a melting temperature of the core, and the strength of the shell is higher than the strength of the core. The composite fiber can be manufactured into a composite board with high impact strength, high moldability, low ductility, light weight and high heat resistance, and thereby meeting protection requirements.

What is claimed is: 
     
         1 . A composite fiber, which is composed of a core and a shell formed around the core, a melting temperature of the shell being lower than a melting temperature of the core, and the strength of the shell being higher than the strength of the core. 
     
     
         2 . The composite fiber as claimed in  claim 1 , wherein the core is made of polypropylene copolymers or polypropylene homopolymers, and the shell is made of polyethylene copolymers, polyethylene homopolymers, polypropylene copolymers or polypropylene homopolymers. 
     
     
         3 . The composite fiber as claimed in  claim 1 , wherein the melting temperature of the core is between 160° C. and 180° C. and the melting temperature of the shell is between 120° C. and 140° C. 
     
     
         4 . The composite fiber as claimed in  claim 2 , wherein the melting temperature of the core is between 160° C. and 180° C. and the melting temperature of the shell is between 120° C. and 140° C. 
     
     
         5 . A composite board made of multiple composite fibers, wherein the composite fibers are each composed of a core and a shell formed around the core, a melting temperature of the shells is lower than a melting temperature of the cores, and the strength of the shells is higher than the strength of the cores; and
 the composite board comprises:   multiple substrates; and   multiple composite layers which are arranged alternately with the substrates, each composite layer composed of the cores of the composite fibers and a coating body coating the cores, and the coating body attached to the adjacent substrate;   wherein the composite layer is made of the shell and the core.   
     
     
         6 . The composite board as claimed in  claim 5 , wherein the cores are made of polypropylene copolymers or polypropylene homopolymers, and the shells are made of polyethylene copolymers, polyethylene homopolymers, polypropylene copolymers or polypropylene homopolymers. 
     
     
         7 . The composite board as claimed in  claim 5 , wherein the melting temperature of the cores is between 160° C. and 180° C. and the melting temperature of the shells is between 120° C. and 140° C. 
     
     
         8 . The composite board as claimed in  claim 6 , wherein the melting temperature of the cores is between 160° C. and 180° C. and the melting temperature of the shells is between 120° C. and 140° C.