A process is provided for coating of substrate webs with polyethylene wherein the edge thickening and other processing difficulties caused by the necking-in phenomenon are minimized. The process comprises extruding a polyethylene having a melt index between 30 dg/min and 100 dg/min through a slot in a slotted die in the form of a sheet onto the moving substrate web to form the coated web, and passing the coated web through a nip roll assembly comprising a chill roll and a nip roll, the slotted die having at the extremities of the slot therein edge guides which are maintained at a temperature above the melting temperature of the polyethylene and are contoured to guide the adhered edges of the extruded sheet into the throat of the nip roll assembly.