Seamless ball structure

Abstract

A seamless ball structure, particularly suitable for balls used in different ball games, such as soccer, volleyball and basketball, includes an inner bladder, and an inner yarn layer, an emulsion layer and an outer cover layer sequentially provided on an outer surface of the inner bladder from inner to outer side. The emulsion layer inwardly permeates into voids among the yarns of the inner yarn layer. The outer cover layer is attached at an inner fabric layer thereof to an outer surface of the emulsion layer. The emulsion layer being heated and pressurized is in an adhering state to sufficiently tightly attach to the inner yarn layer and the outer cover layer, giving the ball so formed an increased structural strength. The ball can be easily and quickly manufactured at reduced manufacturing cost to thereby provide an improved ball structure that does not require any sewing with threads.

1 . A seamless ball structure, comprising:
 an inner bladder forming a center of the ball structure;   an inner yarn layer being wound around an outer surface of the inner bladder;   an emulsion layer being applied to an outer surface of the inner yarn layer; and   an outer cover layer being attached to an outer surface of the emulsion layer.   
     
     
         2 . The seamless ball structure as claimed in  claim 1 , wherein the outer cover layer is further applied on an inner surface thereof with another emulsion layer. 
     
     
         3 . The seamless ball structure as claimed in  claim 1 , wherein the ball structure is heated and pressurized after the outer cover layer is attached to the outer surface of the emulsion layer, so that the emulsion is in an adhering state. 
     
     
         4 . The seamless ball structure as claimed in  claim 1 , wherein the outer cover layer includes at least:
 an inner fabric layer for inwardly directly attaching to the emulsion layer;   a seamless outer layer being formed of a plurality of identically shaped pieces, which are orderly placed adjacent to one another to complete the seamless outer layer; and   a filling material being sandwiched between the inner fabric layer and the seamless outer layer.   
     
     
         5 . The seamless ball structure as claimed in  claim 4 , wherein the seamless outer layer is made of a thermoplastic polyurethane material (TPU), and the filling material is ethylene vinyl acetate (EVA).