MOLDING PLASTIC-COVERED GOLF BALLS

摘要

1410808 Moulding golf balls UNIROYAL Inc 15 Dec 1972 [29 Dec 1971] 58120/72 Heading B5A In a process of moulding a golf ball, two preformed hemispherical shells which are to form the cover, are compressed in heated opposed mould halves between the mould cavity walls and opposed hemispherical projections extending from a heated intermediate mould member; the mould halves are then separated whilst retaining the cover shells and the intermediate member removed whereupon a golf ball core is located in one shell and the mould halves again pressed together whilst still heated to the same temperature so as to form a continuous cover around the core; the mould halves are then cooled whilst still in contact to set the cover. The shells may be made from a copolymer of ethylene and methacrylic acid and preformed at between 380‹ and 410‹ F., in which case the mould halves are heated to between 250‹ and 325‹ F. and the intermediate member to between 120‹ and 180‹ F.