New Service and New Heaters for Hot-Runners

Molders who do not require a complete hot half but would like prewired, drop-in hot-runner system can take advantage of a new service from Gunther Hot Runner Systems Inc., Buffalo Grove, Ill.

Molders who do not require a complete hot half but would like prewired, drop-in hot-runner system can take advantage of a new service from Gunther Hot Runner Systems Inc., Buffalo Grove, Ill. Gunther will deliver a manifold with nozzles pre-wired on a “super frame” that can be used as a drop-in system. The system can be delivered in about four weeks, vs. six to eight weeks for a typical hot half. Meanwhile, Gunther has new heating elements for its Gatekeeper nozzle series that reportedly provide superior temperature control at the gate while eliminating resin degradation inside the nozzle body. The new Hot Slot mineral-insulated cable heater is pressed into a milled slot in a brass sleeve made from bar stock. This ensures precise location of the heating element in relation to the gate every time, so there is no temperature variance from nozzle to nozzle in a mold. And pressing the heater into a milled brass sleeve rather than casting it into brass eliminates voids that can interrupt heat transfer. Gunther also offers new Thick Film Heater technology with the Gatekeeper nozzles for molding high-temperature parts with low-shot weights (such as 0.02-g parts of LCP or glass-filled nylon). The externally mounted, 230V film heater can operate as high as 932 F (500 C). It reportedly provides fast temperature response and allows for smaller pitch distances. In addition, Gunther’s cold-runner technology for LSR is now being developed for general thermoset use. The internally cooled system can be used for direct gating of seals and gaskets.