Golf ball, has moulded cover with regular or irregular grooves for reducing drag

摘要

#CMT# #/CMT# The ball comprises a single or multi-layer core comprising a plastic material (e.g. synthetic rubber or polybutadiene), metal and/or a ball filled with liquid and at least one cover layer comprising one or more synthetic polymers (e.g. Surlyn, ionomer, balata or other natural latex or elastomer) moulded around the core, optionally with an intermediate layer of e.g. spirally wound rubber yarns. The cover has a surface profile of dimples in the form of e.g. circular, hexagon, pentagon, flower motif, terraced or stepped shape recesses in a symmetrical or asymmetrical arrangement. The mould tool used to form the cover includes at least one regular and/or irregular groove (17) and/or a deeper line piece in order to form a corresponding dimple-free grooved region in the ball. Multiple grooves have the same effect as dimples, namely the reduction of drag. #CMT#USE : #/CMT# For playing golf. #CMT#ADVANTAGE : #/CMT# The ball has improved flight properties. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The figure shows a cross-section of the ball. 17 : Groove.