Method of manufacturing game ball
OwnerSung-Yull Leeinventor
Life of this patent
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Abstract
Disclosed is a process for producing the baseball or softball for child, for exercise and for toy that has good security characteristics and similar playing characteristics to a conventional game ball. The invention provides the process of manufacturing a game ball wherein products with the same appearance as the conventional baseball can be obtained at a time by injecting, pressing and foaming the material of EVA alone or blend thereof. Thus, the process can decrease a danger of the ball currently used in the Little League greatly and provide a process of producing the game ball for child, exercise and toy that displays the uniform pattern and playing characteristics and has the high productivity.
Claims2
A method of manufacturing a game ball, in which the game ball is molded in one shot by injection press foaming of a compounded material comprising EVA alone or blends thereof, the method comprising the steps of:
- providing a mold for use in injection press foaming, which has a size of 0.85-0.75 times the size of the game ball,
- compounding EVA alone or blends thereof as base polymer with an azodicarbonamide, sulfonyl hydrazide- or urea-based foaming agent, a peroxide-type crosslinking agent, a dispersant of stearic acid or wax, and an inorganic filler selected from the group consisting of CaCO3, MgCO3 and mica, so as to be uniformly dispersed;
- mounting the mold on an injection press;
- transferring the compounded material into an injector cylinder of the injection press;
- performing injection molding of the compounded material on the injection press at an injector temperature of about 80-100° C., a press plate temperature of about 150-190° C. and a curing time of about 400-2000 seconds;
- and
- cooling the injection-molded material for about 10-30 minutes at about 40° C., thereby manufacturing a game ball.
Dependencies are inferred from the claim text.