Husky Innovations in hot runner nozzle design
Canada – Hot runner innovations are required by moulders to remain competitive. Whether it is sophisticated gate control or new nozzle designs, the industry is constantly moving forward.
In 2014 Husky introduced the Ultra Helix valve-gate nozzle line, designed for direct gating of parts with gate vestige as slight as an ejector pin mark. Husky developed manufacturing technologies that are said to guarantee stem-to-gate orifice concentricity, which minimises mechanical wear of valve-gate components. There is also a new heater design that provides a consistent thermal melt profile that allows the processing of a wide range of materials. The valve-gate nozzle is designed to extend gate life to millions of cycles, Husky says.
Husky has extended the range of products under its Ultra Helix series of valve-gate nozzles with two new sizes, including the Ultra Helix 350 nozzle designed to handle 5-20 g/s of material and the Ultra Helix 750 nozzle that can process 50 to 250 g/s.
Husky currently offers two variations of the valve-gate nozzle, including the Ultra Helix VG, where all critical gate geometry is contained within the tip, which has an outside diameter of 3 mm. The Ultra Helix VR version can be retrofitted to existing cold halves, Husky says. The company adds that it virtually eliminates mechanical wear by keeping the valve stem centered on the gate.
Husky has also developed new heater technology and new tip designs for its Ultra Side Gate hot-tip nozzles. The new design better handles high-temperature technical resins and is said to be ideal for deep-draw parts. Ultra Side Gate also incorporates spring-loaded components that ensure a complete seal between tip and nozzle and between nozzle and manifold for leak-proof operation, Husky says.