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MOULDS | HOT RUNNERS


Right: The Dura Plus automotive lens moulding hot runner solution from Mold Masters has been engineered to produce consistent high-quality parts with good clarity


Below:


Mold-Masters has developed the Melt-Cube EVO as a hot runner for high cavitation moulds producing deep draw medical parts


which includes an expanded nozzle range and water-less actuator technology. The F3000 and F8000 nozzles expand the capabilities and applications of this system to include shot sizes from less than 15g to over 5,000g. The F3000 has a shot capacity of less than 15g, which is ideal for smaller under-hood compo- nents, technical automotive components and price sensitive packaging and consumer goods applications. The F8000 increases shot capacity of the system further to 5,000g by utilising runner diameters up to 28 mm. Nozzle lengths are also available that exceed 1 m. F8000 has been developed to meet the processing requirements of common large automotive components like fascias, instrument panels and door panels, and large white goods. Additionally, Fusion-Series G2 systems will also be available with the new water-less actuator which incorporates new Passive Actuator Cooling Technol- ogy (PACT). The company says that this eliminates hose-plumbed cooling circuits to actuators and facilitates faster mould changes and provides long-term performance reliability. Maximised for uptime, the Fusion Series G2 hot runner system is delivered completely pre-assembled and pre- plumbed, saving significant set-up time. Incorporat- ing field replaceable heater bands ensures that any maintenance is quick and easy. In addition, the Mold-Masters Dura Plus automo- tive lens moulding hot runner solution has been engineered to produce consistent high-quality parts with good clarity. It is compatible with abrasive and corrosive resins, such as PC, PC-ABS and PMMA. With its introduction, enhancements over the previous Dura system include new Dura Plus nozzles with enhanced thermal profile, full stainless steel construction and a highly polished runner finish which work together to improve processability, provide greater system durability and prevent contamination defects of moulded parts. In the field,


cycle time improvements of 22% and a low


scrap rate of 0.8% have been observed. Mold-Masters has also developed the Melt-Cube EVO as a hot runner for high cavitation moulds producing deep draw medical parts, such as


pipette tips, syringe barrels, needle shields and horizontal tips. The company says that it is designed to minimise maintenance turnaround significantly by up to 85%


- for example a saving of up to five hours on a 64 cavity system - and improved handling safety with the ability to be serviced at cold temperatures and using only one torque value. The new design has retained all the strengths from the previous version, such as


gate located tips that maintain critical tolerance resulting in good gate quality; however, with the simplified design there has been a reduction in the number of bolts securing each pair of tips from seven to one, reducing assembly and disassembly times for service and set-up. Melt-Cube EVO also offers simultaneous direct horizontal side gating of up to eight cavities per cube eliminating scrap from sub-runners and enhancing part quality. Mold-Mas- ters Brazed Heater Technology also delivers good processing capabilities through hotter processing temperatures for a wider processing window and good thermal balance both throughout the manifold and tip to tip. The Mold-Masters TempMaster Series hot runner


controller has also been upgraded. The temperature controller features APS technology, an auto-tuning control algorithm delivering precision and reliability varying only slightly from set point. The result is enhanced moulded part quality, consistency and minimised scrap. The enhanced TempMaster M2+ controller is capable of controlling up to 500 zones and is now available with larger and more powerful touchscreen controls with a new modernised interface. Functionality like SVG, E-Drive Synchro Plate, M-Ax Auxiliary Servos and water flow tempera- ture can be integrated, monitored and controlled from a centralised location. At Fakuma 2018, Mold-Masters showed the SeVG+ (Sequential Electric Valve Gate) control feature in an ImFlux low-pressure moulding cell comprising a Milacron


Elektron EVO machine and Master-Series hot runner system. Each valve pin is connected to an individual servo motor which allows for full, on-the-fly adjustment of pin position, stroke, speed,


32 INJECTION WORLD | November/December 2018 www.injectionworld.com


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