Surface winder for producing logs of convolutely wound web materials

A surface winder for winding a web material about a core having a radius, R, to obtain a log of convolutely wound web material, the surface winder comprising a core inserter for inserting said core into an introductory portion of a winding cradle, said introductory portion being defined by an upper winding roller, supplied from above with said web material directed towards said introductory portion at a velocity, v, and at a bottom by a concave cradle having a leading edge device, said concave cradle being associated downstream with a lower winding roller, said surface winder comprising a third oscillating roller arranged above said lower winding roller, said upper winding roller, said lower winding roller, and said third oscillating roller each having a respective axes parallel to each other and perpendicular to the feeding direction of said web material and cooperating with each other downstream of said introductory portion to form said winding cradle in order to convolutely wind said web material about said core to obtain said log, said leading edge device comprising a surface, said leading edge device having at least one channel disposed therein, said at least one channel having a single entry point and a single exit point and extending from a position external to said leading edge device and a first location disposed upon said surface, said first location disposed upon said surface being capable of receiving a fluid from said at least one channel, said fluid being fluidically displaced onto said core from said at least one channel when said core is in contacting engagement with said first location disposed upon said surface.