CAPS AND CLOSURES | TECHNOLOGY
Schmid, Team Leader Applications. “This means that the main axes such as clamp, ejector, injection and unit movement are either hydraulically or electrically driven. The latest hybrid Netstal machines have the best power/energy ratio and therefore each axis provides the highest perfor- mance. However, depending on the application, this also means that the power reserve may be too high. With our hybrid machines, the injection is hydraulically driven, and the full injection pressure is always available. In cap applications, the full injection pressure is usually not required, and the excess energy is unused. Therefore, we considered only providing the injection pressure needed for the application. The result is adaptive system pressure reduction. This means that the machine automatically adjusts the hydraulic pressure to the optimum point of the application, without any loss of performance or quality for the application. The new option is available for all hybrid Netstal injection moulding machines running the latest aXos version (release 8.6.0). Retrofitting of existing machines is possible.” Adaptive system pressure reduction permanent- ly determines the optimum operating pressure in the hydraulic system. The feature lowers power consumption while maintaining at least the same productivity, reducing the carbon dioxide footprint and it pays for itself in a short time, says the company. To handle peak loads without any problems, the hydraulic system of hybrid Netstal injection moulding machines is designed for a maximum system pressure of 250 bar. Depending on the application, a lower value would also be sufficient. In automatic mode, the adaptive control
IMAGE: HUSKY
system determines the optimum point at any time and adjusts the system pressure accordingly. With the same or even increased productivity, the energy consumption for providing the system pressure is reduced to a minimum. A lower load on the components can also have a positive effect on machine availability, maintenance intervals can be planned more efficiently, and the machine produc- es for a longer time. Schmid says that depending on the closure
design, adaptive system pressure reduction can save up to 20% electricity. Depending on the application, the control of the machine determines the corresponding pressure requirement and then adjusts itself accordingly to the required pressure level. This is all without any loss of performance because only the power reserves are eliminated. In an example, an Elion 4200 with a 96-cavity mould manufactured 26 mm CSD caps, weighing 1.65g for a GME 30.40 neck design. Energy savings
Above: Examples of Husky’s tethered closure portfolio
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