Gunther Hot Runner Systems Inc. of Buffalo Grove, Ill., is developing a new type of hot-runner manifold heater: thick-film heating elements that are steel plates and can be fixed on the outer surface of the manifold.
Gunther said the design provides even heat distribution.
Also in final development is a new heater technology for nozzles designed to fit nozzles for low voltage and 230 volts in the same small outer measurements.
New from the company is the SFT/DFT Micro Series nozzle, now available in 230 volts. It can achieve pitch centers of less than 9 millimeters. The nozzle is available as a thermal-gate nozzle system, or as a valve-gate system.
A special feature of Gunther's 230-volt single nozzle is a strengthened heater capacity in the nozzle head. The construction provides for a reduced thermal load of the plastic, enabling trouble-free melt of plastics at high temperatures, the firm said.
Gunther also is developing a 64-cavity hot-runner system for insert molding tiny parts, using glass-fiber-strengthened poly-phenylene sulfide. The system uses 32 double nozzles with hard metal tips and a nozzle distance of 0.38 inch.
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