HOT RUNNER COMPONENT HEATER HAVING THERMAL SPRAYED RESISTIVE ELEMENT

摘要

A hot runner component for heating and directing fluid material of a melt stream to a mold cavity is provided. The hot runner composent includes a body (12) having a fluid passageway therein for conveying the melt stream and a heater (24) for heating the melt stream as the melt stream passes through the fluid passageway of the body. The heater includes a core arranged in surrounding relation to the fluid passageway of the body, a thermally­-sprayed dielectric substrate layer (28) on the core and a thermally-sprayed electrical resistance element layer (30) overlying the dielectric layer. The resistance element layer forms a discrete pattern. The heater further includes a thermally-sprayed dielectric overlay layer that overlies a substantial portion of the resistance element layer.