Process for producing golf ball

A process for producing a golf ball comprising the steps of:

• a kneading step to obtain a rubber composition by kneading a base rubber, a crosslinking agent and solid particles;
• and
• a molding step to form a mid layer by placing a center and said rubber composition disposed around the center into a spherical cavity of a mold comprising an upper and a lower portion, followed by compression of the mold, and by allowing excess rubber composition to outflow from a space between the upper portion and the lower portion of the mold,
• wherein adjustment is executed so that said mid layer comprises 6 or more solid particles having a ratio “W/T”, a ratio of the radial width W thereof to the thickness of the mid layer T, of from 0.3 to 1.0.

A process for producing a golf ball comprising the steps of:

• a kneading step to obtain a rubber composition by kneading a base rubber and a crosslinking agent;
• a preliminary molding step to form a half shell from said rubber composition;
• an embedding step to embed solid particles into said half shell;
• a covering step to cover a center with two half shells;
• and
• a molding step to form a mid layer by placing thus integrated center and half shells into a spherical cavity of a mold comprising an upper and a lower portion followed by compression of the half shells in the mold, and by allowing excess rubber composition to outflow from a space between the upper portion and the lower portion of the mold,
• wherein adjustment is executed so that said mid layer comprises 6 or more solid particles having a ratio “D/T”, a ratio of the particle size D to the thickness of the mid layer T, of equal to or greater than 0.3.

A process for producing a golf ball comprising the steps of:

• a kneading step to obtain a rubber composition by kneading a base rubber and a crosslinking agent;
• a preliminary molding step to form a half shell from said rubber composition;
• an embedding step to embed solid particles into said half shell;
• a covering step to cover a center with two half shells;
• and
• a molding step to form a mid layer by placing thus integrated center and half shells into a spherical cavity of a mold comprising an upper and a lower portion followed by compression of the half shells in the mold, and by allowing excess rubber composition to outflow from a space between the upper portion and the lower portion of the mold,
• wherein adjustment is executed so that said mid layer comprises 6 or more solid particles having a ratio “W/T”, a ratio of the radial width W thereof to the thickness of the mid layer T, of from 0.3 to 1.0.