Method for casting a cover on a golf ball precursor product
View Patent ↗A mold for casting a cover for a golf ball is disclosed herein. The mold is composed of a first mold half and a second mold half. Each mold half has an internal hemispherical cavity and a plurality of recesses in flow communication with the internal hemispherical cavity. The recesses are preferably concave on one side of the parting line and convex on the opposing side of the parting line. Preferably, the mold assembly is utilized to mold a polyurethane cover on a golf ball precursor product.
1. A method for casting a cover on a golf ball precursor product, the method comprising:
dispensing a liquid thermosetting polyurethane prepolymer in a first mold half, the first mold half comprising a body having a wall and a perimeter perpendicular to the wall, the body having an internal hemispherical cavity, the perimeter having a plurality of recesses, each of the plurality of recesses in flow communication with the internal hemispherical cavity, each of the plurality of recesses separated from an adjacent recess by a land area of the perimeter;
placing a golf ball precursor product into the liquid thermosetting polyurethane prepolymer dispensed in the first mold half;
dispensing the liquid thermosetting polyurethane prepolymer in a second mold half, the second mold half comprising a body having a wall and a perimeter perpendicular to the wall, the body having an internal hemispherical cavity, the perimeter having a plurality of recesses, each of the plurality of recesses in flow communication with the internal hemispherical cavity, each of the plurality of recesses separated from an adjacent recess by a land area of the perimeter and each of the plurality of recesses having a first end and a second end opposite the first end along a circumference of the internal hemispherical cavity, wherein each of the plurality of recesses of the first mold half oppose land area of the perimeter of the second mold half and each of the plurality of recesses of the second mold half oppose the land area of the perimeter of the first mold half when the first mold half is mated to the second mold half, and each of the plurality of recesses of the first mold half having a first end that overlaps a first end of a recess of the plurality of recesses of the second mold half, and each of the plurality of recesses of the second mold half having a second end that overlaps a second end of a recess of the plurality of recesses of the first mold half when the first mold half is mated to the second mold half;
mating the first mold half having the liquid thermosetting polyurethane prepolymer and the golf ball precursor therein with the second mold half having the liquid thermosetting polyurethane prepolymer therein;
forming within the mated first and second mold halves a cover on the golf ball precursor product with a continuous tab.
2. The method according to claim 1 wherein each of the plurality of recesses of the first mold half has a concave opening to the internal hemispherical cavity and each of the plurality of recesses of the second mold half has a convex opening to the internal hemispherical cavity.
3. The method according to claim 1 wherein the internal hemispherical cavity of the first mold half and the second mold half has a radius of 0.84 inch.
4. The method according to claim 1 wherein the perimeter of the first mold half has from 20 to 40 recesses, and the perimeter of the second mold half has from 20 to 40 recesses.
5. The method according to claim 1 wherein the perimeter of the first mold half has from 30 recesses, and the perimeter of the second mold half has 30 recesses.
6. The method according to claim 1 wherein each of the plurality of recesses of the perimeter of the first mold half has a depth from the perimeter ranging from 0.010 inch to 0.040 inch, and each of the plurality of recesses of the perimeter of the second mold half has a depth from the perimeter ranging from 0.010 inch to 0.040 inch.
7. The method according to claim 1 wherein the perimeter of the first mold half has a 360 degrees surface and the perimeter has a recess between 9 degrees intervals of the 360 degrees surface, and the perimeter of the second mold half has a 360 degrees surface and the perimeter has a recess between 9 degrees intervals of the 360 degrees surface.
8. The method according to claim 1 wherein each of the plurality of recesses of the perimeter of the first mold half has a length from the internal hemispherical cavity towards the end of the perimeter ranging from 0.010 inch to 0.040 inch, and each of the plurality of recesses of the perimeter of the second mold half has a length from the internal hemispherical cavity towards the end of the perimeter ranging from 0.010 inch to 0.040 inch.
9. The method according to claim 1 wherein the first and second mold halves are without gates.