High speed nylon coating of wire using a plasto-hydrodynamic pressure unit

A process known as plasto-hydrodynamic wife coating has been developed in which polymer melts are used as pressure medium in a stepped parallel bore pressure unit. The wire size is less than the smallest bore of the pressure unit. The wire coating thickness and quality depend on the wire speed, polymer viscosity, polymer melt temperature and gap between the wire and the die. In this paper results of experimental investigation are presented comparing the coating quality on galvanized mild steel wire when molten Nylon 6 is used as the coating material at different temperatures and back pressures. Also the coating thickness and quality are discussed for different wire speeds of upto 12 meter per second.