INNOVATION | CAPS AND CLOSURES
Above: The dry-cycle times of the Netstal Elion have been reduced by up to 0.2s across the entire model range
Right: Borealis has launched BorPure RF777MO, which is
designed for flip-top cap applications
420 with clamping forces from 2,200-4,200 kN. KraussMaffei has reduced the dry-cycle times of the high-performance Netstal Elion by up to 0.2s across the entire model range. The shorter dry cycles are available for all models with aXos version 8.2.0 and upwards. The company says that this update for the series incorporates the latest controller technology insights, which had already been applied to the Netstal Elios series. The additional speed is made possible through the adaptive optimisation of the acceleration and deceleration ramps for the clamping unit drive. The result is that the maximum moving speed will be reached faster and can be maintained longer before the moving mould plate is decelerated and the toggle lever mechanism transitions to building up the clamping force – all without compromising mould protection. The company adds that taking into account the potential mould weight allows shorter production cycles. However, a shorter dry-cycle time does not automatically mean a faster cycle under real production conditions. That is why the new control algorithm takes into account the potential tool weight based on the set installation height and incorporates it in the control of the acceleration and decelera- tion process. This allows speed- ing up of production and further productivity increases. For high-performance closure
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applications, a Netstal Elion 4200 with a 96-cavity mould was set up to produce type 29/25 HDPE closures. One closure weighs 1.23g. Due to the optimised control, the cycle can be shortened from 2.77s to 2.6s. The hourly output goes up from 124,750 to 132,920 closures, which is a productiv- ity increase of 6.5%.
34 INJECTION WORLD | April 2020
Borealis has developed BorPure RF777MO for flip-top cap applications. Based on Borstar Nuclea- tion Technology, this new resin fulfils value chain demand for high-quality solutions offering good organoleptics. A next generation random polypro- pylene (PP), BorPure RF777MO has been designed for use in flip-top caps, a growing caps and closures market segment. The company says that the caps and closures industry needs to respond to a broad and diverse set of requirements. Converters demand innovative material solutions that reduce energy consumption and help increase productivity on injection moulding lines. Resins must offer easy processabil- ity, consistency, high quality and provide optimal performance on the capping line. For brand owners and final consumers, caps and closures must secure package contents, provide ideal organoleptic properties, safety and convenience. They must also stand out on the retail shelf and, increasingly, offer the lowest possible environmen- tal footprint. This expansion of the BorPure family of multimodal polyolefin resins with good taste and odour properties enables Borealis to support its value chain partners better in fulfilling this diverse range of demands, it says. The company adds that BorPure RF777MO is based on in-situ nucleation technology, which helps producers enhance productivity and sustain- ability. Cycle times are reduced. For certain cap applications, cycle time reductions of more than 10% can be achieved due to fast crystallisation behaviour. The impact of colouring on dimensional stability can be lowered due to fast colour change during processing without having to change process param- eters. In addition, energy consumption can be reduced resulting from lower barrel
temperatures. Finally, the overall CO2 footprint can be lowered due to reduced energy consumption and faster cycle times on injection moulding lines. For brand owners, BorPure RF777MO offers high transparency in combination with good gloss and hinge performance. Testing by an independent institute in Europe has confirmed
the good organoleptic properties and the suitabil- ity of RF777MO for the most sensitive beverage and food applications. Hinged caps made using this new resin are particularly robust, demonstrat- ing good hinge strength and stability. As a mono- material solution, caps made using RF777MO are also 100% recyclable, says Borealis.
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IMAGE: KRAUSSMAFFEI
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