Composite solid tire and method of producing same

Abstract

A composite solid tire, including a worn solid rubber tire having a remaining rubber layer, and a thermo-setting polyurethane elastomer layer which is provided on an outer circumferential surface of the rubber layer.

1 . A composite solid tire, comprising: 
 an inner layer of a rubber layer; and    an outer layer made of a thermo-setting polyurethane elastomer which is provided on an outer circumferential surface of the rubber layer.    
     
     
         2 . The composite solid tire according to  claim 1 , wherein said rubber layer is formed of a worn solid rubber tire, and the rubber layer has a pre-determined thickness.  
     
     
         3 . The composite solid tire according to  claim 1 , wherein said rubber layer is formed of at least one rubber material, which is softer than the thermo-setting polyurethane elastomer of the outer layer.  
     
     
         4 . The composite solid tire according to  claim 1 , wherein a characteristic value of the thermo-setting polyurethane elastomer according to Taber Abrasion Test is  90  mm 3  or less.  
     
     
         5 . The composite solid tire according to  claim 1 , wherein a percentage of a thickness of the outer layer relative to a whole thickness of said composite solid tire in a radial direction thereof is not more than 40%.  
     
     
         6 . The composite solid tire according to  claim 1 , wherein said outer layer is formed by reacting and setting of at least one polyisocyanate component selected from the group consisting of tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and naphthalene diisocyanate (NDI), and at least one polyol component selected from the group consisting of poly(oxybutylene)glycol, polyester polyol, and polyethylene adipate glycol.  
     
     
         7 . The composite solid tire according to  claim 6 , wherein said at least one polyisocyanate component and said at least one polyol component are reacted and set at a temperature of 70° C. to 115° C.  
     
     
         8 . A method of producing a composite solid tire according to  claim 1 , the method comprising the steps of 
 providing a rubber layer to be the inner layer of said tire;    applying a primer and an adhesive to the outer circumferential surface of said rubber layer; and    forming an outer layer by causing raw materials of a thermo-setting polyurethane elastomer to react and cure by die-casting.    
     
     
         9 . A method of producing a composite solid tire, the method comprising the steps of 
 cutting an outer circumferential surface of a remaining rubber layer of a worn solid rubber tire;    applying a primer and an adhesive to the cut outer circumferential surface of the rubber layer; and    forming an outer layer which is formed by causing raw materials of a thermo-setting polyurethane elastomer to react and cure by die-casting.    
     
     
         10 . The method of producing a composite solid tire according to  claim 8 , wherein said die-casting is implemented by introducing said raw material of the thermo-setting polyurethane elastomer into a space in a die-casting device, said space is formed between an inner circumferential surface of an outer die and an outer circumferential surface of said rubber layer, wherein said inner circumferential surface and said outer circumferential surface are heated in a way that a temperature of said outer circumferential surface is higher than that of said inner circumferential surface.  
     
     
         11 . The method of producing a composite solid tire according to  claim 9 , wherein said die-casting is implemented by introducing said raw material of the thermo-setting polyurethane elastomer into a space in a die-casting device, said space is formed between an inner circumferential surface of an outer die and an outer circumferential surface of said rubber layer, wherein said inner circumferential surface and said outer circumferential surface are heated in a way that a temperature of said outer circumferential surface is higher than that of said inner circumferential surface.