NOZZLE AND APPARATUS FOR INJECTION MOLDING

摘要

A nozzle (10) controls flow of melt in injection molding equipment by passive actuation with opening and closing of a mold assembly. The nozzle comprises a valve pin (20) having a pin passage (22) therethrough movably supported within a nozzle passage (14) and a contact arm(30) transverse to and extending beyond the nozzle passage, the valve pin sealingly engaging the nozzle passage. Biasing means (35) biases the valve pin to a closed position preventing passage of melt through the nozzle. The contact arm effects movement of the valve pin to an open position when closing of the mold assembly exerts a force on the contact arm to overcome the biasing means . A mold arrangement of plural mold assemblies comprises pairs of nozzles of the invention to control flow of melt through mating conduit segments between an injection unit and at least one mold assembly, the nozzles arranged and configured for seating engagement with abutment of the conduit segments.