Sporting ball and method of manufacturing the same

Abstract

A sporting ball includes a ball core unit, a main body unit and an outer covering unit. The ball core unit includes a spherical cork body, and a rubber layer covering the cork body. The main body unit includes a yarn layer having at least one piece of yarn wrapped around the ball core body, and a rubber film layer fixedly covering the yarn layer and being immovable relative to the yarn layer. The outer covering unit fixedly covers an outer surface of the main body unit. A method of manufacturing the sporting ball is also disclosed.

What is claimed is: 
     
         1 . A sporting ball comprising:
 a ball core unit including a spherical cork body, and a rubber layer covering said cork body;   a main body unit including a yarn layer that has at least one piece of yarn wrapped around said ball core unit, and a rubber film layer that fixedly covers said yarn layer and that is immovable relative to said yarn layer; and   an outer covering unit fixedly covering an outer surface of said main body unit.   
     
     
         2 . The sporting ball as claimed in  claim 1 , wherein said film layer infiltrates into said yarn layer. 
     
     
         3 . The sporting ball as claimed in  claim 1 , wherein said main body unit further includes an anti-stick powder layer formed on an outer surface of said film layer and disposed between said film layer and said outer covering unit. 
     
     
         4 . The sporting ball as claimed in  claim 1 , wherein said outer covering unit includes a plurality of leather strips, and a stitch stitching together said leather strips by edges of said leather strips such that said leather strips cover an outer surface of said main body unit. 
     
     
         5 . The sporting ball as claimed in  claim 1 , wherein said outer covering unit includes a plurality of leather strips, and a stitch stitching together said plurality of leather strips by edges of said leather strips such that said leather strips cover an outer surface of said main body unit, at least a portion of said stitch penetrating said film layer of said main body unit. 
     
     
         6 . The sporting ball as claimed in  claim 1 , wherein said film layer of said main body unit is formed by solidifying liquid rubber resin. 
     
     
         7 . A method for manufacturing a sporting ball, comprising:
 a preparing step to prepare a ball core unit that includes a spherical cork body, and a rubber layer covering the cork body;   a wrapping step to wrap at least one piece of yarn around the ball core unit repeatedly to form a yarn layer;   a covering step to cover the yarn layer with a liquid rubber resin and to dry the liquid rubber resin to form a rubber film layer that fixedly covers the yarn layer and that is immovable relative to the yarn layer; and   a stitching step to stitch together a plurality of leather strips by edges of the leather strips to form a stitch such that the leather strips cover an outer surface of the film layer.   
     
     
         8 . The method of making a sporting ball as claimed in  claim 7 , wherein said covering step is to infiltrate the liquid rubber resin into the yarn layer before being dried. 
     
     
         9 . The method of making a sporting ball as claimed in  claim 8 , wherein said covering step is to apply the liquid rubber resin to the yarn layer using one of the methods of soaking, spraying and dipping. 
     
     
         10 . The method of making a sporting ball as claimed in  claim 7 , wherein said covering step is to dry the liquid rubber resin by heating under a temperature between 80° C. and 100° C. so as to solidify the liquid rubber resin on the yarn layer. 
     
     
         11 . The method of making a sporting ball as claimed in  claim 7 , further comprising, after said covering step, a coating step to coat an outer surface of the film layer with an anti-stick powder to form an anti-stick powder layer. 
     
     
         12 . The method of making a sporting ball as claimed in  claim 7 , wherein said stitching step is to make at least a portion of the stitch penetrate the film layer.