Method of making a ball having a foamed spherical center core, windings and cover

摘要

A method for making a ball having a cover and a core, which core has a spherical center and a winding, is disclosed. The ball is made by foam injection molding a thermoplastic resin comprising a mixture of at least about 45% of a copolymer of at least one olefin with at least one unsaturated monocarboxylic acid to form a spherical partially blown center. The center is then wound to form a wound core which is immersed in an adhesive which impregnates the yarn. The wound core is then dried and ironed the melt the surface of the center so as to fuse the windings to the center. A cover is then applied to the core to form the completed ball.