Carbide rod screening nozzles

摘要

A degradation resistant nozzle for a screening, extrusion or similar processes has a tip surface formed by one or more rods of a material having an increased hardness relative to the body portion of the nozzle. The rods are preferably of circular cross-section and formed of tungsten carbide. The rods are removably attached in preferably circular grooves in the tip of the nozzle body. The removability of the rods facilitates reworking of the nozzle when wear occurs since new rods can quickly and inexpensively be substituted. The degradation resistant nozzle also decreases wear and scoring of stencils used in screening processes and thus increases the useful life thereof.