Reflector and manufacturing method thereof

Abstract

A reflector reflects incident light and comprises crystalline plastic in which a crystal region and an amorphous region are mixed, wherein the amorphous region includes a plurality of orientation layers comprising amorphous particles that are oriented in a predetermined direction. The reflector, which has high reflectance, is formed by extending a crystalline plastic material exhibiting a superior extensibility to extend the amorphous particles in the amorphous region in the predetermined direction so as to form a plurality of extension layers in the amorphous region. Since a reflector having a superior performance with a very improved reflectance can be provided due to a high diffuse reflectance by the extension layers in the amorphous region without a foaming process or an additional additive to increase the reflectance, the manufacturing process of the reflector is simplified and the manufacturing cost is reduced so that productivity can be greatly improved.

1 - 18 . (canceled) 
     
     
         19 . A method of manufacturing a reflector comprising:
 stretching a crystalline plastic material in amorphous state at a temperature no more than crystallization temperature Tc of the crystalline plastic material, resulting in orientation of amorphous regions in the reflector in order to improve reflectance of the reflector.   
     
     
         20 . The method of  claim 19 , further comprising:
 inputting pellet, a material in amorphous state of the crystalline plastic, to an extrusion molder;   cooling the material exhausted from the extrusion molder at a temperature no more than the crystallization temperature of the crystalline plastic using a cooling roll; and   stretching the material passed through the cooling roll by inputting the material passed through the cooling roll to a stretching chamber.   
     
     
         21 . The method of  claim 19 , further comprising:
 preparing a roll material of a crystalline plastic for stretching; and   stretching the roll material by inputting the roll material to a stretching chamber at a temperature no more than the crystallization temperature of the crystalline plastic Tc.   
     
     
         22 . The method of  claim 19 , wherein the crystalline plastic is a polyester family. 
     
     
         23 . The method of  claim 19 , wherein the crystalline plastic is a polyolefin family. 
     
     
         24 . The method of  claim 23 , further comprising:
 adding a UV stabilizer.   
     
     
         25 . A reflector that is manufactured by one of the methods of  claims 19 - 24 .