TRANSPORT SYSTEM FOR GOLF BALLS THROUGH PLASMA FIELD
An apparatus for use in transporting golf balls through a glow discharge plasma treating field, wherein the surface energy of the golf balls is increased to improve wetting ability and adhesion between layers of the golf balls. The apparatus involves a plurality of plastic open helical tubes for moving the balls such that every ball is afforded maximum exposure to the plasma field.
1 . An apparatus for treating a surface of a golf ball comprising:
a support structure for a treatment tunnel, the tunnel having inlet and exit openings;
a plurality of parallel plate capacitors juxtaposed against lateral sides of the treatment tunnel;
a plurality of transport tubes housed within the tunnel and having a slight downward gradation from the inlet opening to the exit opening;
an electric source for applying high voltage across the capacitors in order to generate an open-air plasma field within the tunnel; and
a continuous rolling feed of golf balls through the plurality of transport tubes, the balls rolling to insure an even distribution of the plasma field to the golf ball surfaces,
wherein, the golf balls are evenly exposed to the plasma field to increase their surface energy and therein improving their wetting ability and adhesion for various coatings and inks.
2 . The apparatus of claim 1 , wherein the transport tubes are of a helical or coiled structure.
3 . The apparatus of claim 2 , wherein the transport tubes have an outside diameter of about 2 inches.
4 . The apparatus of claim 3 , wherein the thickness of the tube is less than 0.10 inches.
5 . The apparatus of claim 2 , wherein the tubes are formed from an electrically non-conductive material.
6 . The apparatus of claim 5 , wherein the tubes are made of ultra high molecular weight polyethylene.
7 . The apparatus of claim 1 , wherein the treatment tunnel is of a rectangular shape and about 72 inches in length.
8 . The apparatus of claim 1 , wherein the number of transport tubes is twelve.
9 . The apparatus of claim 1 , wherein there are two pairs of parallel plate capacitors.
10 . The apparatus of claim 1 , wherein the surface energy of the golf balls is increased by at least 10 dyne/cm 2 .
11 . The apparatus of claim 1 , wherein the plasma field is generated by the glow discharge of an unpolymerizable inorganic gas selected from the group consisting of air, oxygen, or argon.
12 . A golf ball comprising: a core; an inner cover layer comprising an ionomer resin, wherein the outer surface of said inner cover layer is plasma treated to increase the adhesion thereof by raising the surface energy of the inner cover layer by at least 10 dyne/cm 2 .
13 . The golf ball of claim 12 , wherein the outer cover layer comprises urethane.
14 . The golf ball of claim 12 , wherein the outer cover layer has a thickness of less than about 0.045 inches.
15 . The golf ball of claim 14 , wherein the outer cover layer has a thickness of about 0.014 inches to about 0.03 inches.
16 . The golf ball of claim 12 , wherein the inner cover layer is a thermoplastic material having a shore D hardness of about 50 or more, and the outer cover layer is a thermoset material.
17 . The golf ball of claim 16 , wherein said outer cover layer has a shore D hardness between 40 to about 65.