Patent ID: 7208114

Claim:
A method of manufacturing a golf ball having a solid core and a cover which comprises: forming a solid core, a first step of forming two hemispherical half shells made of a thermoplastic resinous composition, the total volume of the two half shells being 105% to 120% of the volume of the cover, a second step of covering the solid core with the half shells in an open mold containing upper and lower portions, each of which having a hemispherical cavity, a third step of clamping the mold a fourth step of heating the thermoplastic resinous composition in a spherical cavity formed by the mold and pressurizing the thermoplastic resinous composition at a pressure of 5 kgf/cm 2 to 50 kgf/cm 2 , and causing the excess thermoplastic resinous composition to flow out of the spherical cavity; a fifth step of heating the thermoplastic resinous composition in the spherical cavity and pressurizing the thermoplastic resinous composition at a pressure of 70 kgf/cm 2 or more to form the cover, and removing the golf ball from the mold.