Multi-cavity heated injection moulding nozzle - having central melt channel leading to branched diagonal channels with means to ensure balanced heating of each of the branch channels

• Main Author: TENG, ALEX C
• Format: Patent
• Language: English; German
• Published: 03.03.2005
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

In a multi-cavity injection moulding nozzle adapted to be seated in a well in a cavity plate, and comprising (a) a melt channel having a cenbtral position branching out into several diagonal portions, (b) equally spaced outlets each connected to a diagonal portion and leading to a gate extending through the cavity plate to one of the mould cavities, and (c) an integral electric heating element having a spiral portion extending around the central portion of the melt channel, the heating element also includes a forward portion located adjacent the forward face of the nozzle and comprising a number of arms each extending radially midway between two adjacent outlets.