Roller with spray-coated surface structure

Abstract

A roller has a spray-coated surface structure that provides the roller with an increased surface friction, so that the roller is suitable for push feeding sheet material. The spray-coated surface structure includes a coarsened layer, a finished layer, and a frictional layer provided on an outer circumferential surface of the roller from inner to outer side. The frictional layer is formed by mixing predetermined amount of liquid polyester with predetermined amount of silicon carbide powder and/or alumina oxide powder at normal temperature and pressure, evenly spraying the mixture over the roller, heating the roller for the mixture to set on the outer surface of the roller, and allowing the roller to cool.

1 . A roller with spray-coated surface structure, comprising a metal roller having a coarsened layer, a finished layer, and a frictional layer sequentially formed on an outer circumferential surface of said metal roller from inner to outer side; 
 said coarsened layer being formed by coarsening an outer circumferential surface of said metal roller;    said finished layer being formed by subjecting an outer circumferential surface of said coarsened layer to a predetermined surface finishing; and    said frictional layer being formed by heating said metal roller to a temperature between 70° C. and 80° C., using a spray nozzle to evenly spray a mixture of polyester and at least one type of powder over the outer circumferential surface of said finished layer of said metal roller, so that the sprayed mixture on said metal roller has a thickness between 40μ and 100μ; heating said metal roller coated with the sprayed mixture of polyester and powder to 180° C. for the mixture to set on said finished layer; and allowing said metal roller to cool.    
   
   
       2 . The roller with spray-coated surface structure as claimed in  claim 1 , wherein said mixture is prepared by stirring to mix 60-70 wt % of liquid polyester with 30-40 wt % of silicon carbide powder and/or alumina oxide powder at normal temperature and pressure.  
   
   
       3 . The roller with spray-coated surface structure as claimed in  claim 1 , wherein said surface finishing is metal plating, and said finished layer is a plated metal layer.