Innovation | packaging
among other areas, on production of logistics packag- ing such as pallets, large bins, crates and buckets, where the use of recycled materials is a major trend, according to Head of Global Business Development Klaus Zeiler. “In the area of pallets, for example, we have recognised an increasing demand for recycled materials up to post-consumer waste. Larger rubbish containers are often produced in sandwich construc- tion, meaning a core of recycled material and thinner outer layers made of new materials. In addition, tool makers strongly focus on multi-injection points. That means the container is not only moulded from the bottom, but also from the side walls. This leads to thinner wall thicknesses in total as well as to a reduction of the clamping force and thus to smaller injection moulding machines,” he explains.
“Sometimes we have
to cope with materials with inferior qualities, which requires sophisticated screw designs,” Zeiler says. “The new intelligent machine function APC plus (Adaptive Process Control) from KraussMaffei is another benefit and leads to more stability and precision in injection moulding. In particular, when using recycled materials we have to cope with different MFI values. The APC plus is able to compensate these fluctuations perfectly.”
Cube technology Arburg has developed its Allrounder Cube machine specifically for high-speed applications multi-shot using cube mould technology. The company says that the new machine series, which is available with clamping forces from 290 to 460 tonnes, is specifically designed for such applications. “For the new Allrounder Cube, we have optimised the complete clamping unit, for example, including the servo-electric toggle, with regard to the cube-mould-specific requirements,” says Andreas Reich, Senior Sales Manager Packaging at Arburg.
The cube mould machines feature
four servo-electric axes as standard: one for mould movement, two for dosing duties, and one for rotating the mould. Injection stroke can be driven either hydraulically or electrically, while the core-pulls for ejection and further mould functions are always hydraulic. Due to the short dry cycle times and the ability to overlap dosing with other
www.injectionworld.com January/February 2017 | INJECTION WORLD 35
machine functions, the cycle time can be reduced by up to one second and output can be improved by 10%, the company claims. The fast servo-electric toggle-type clamping units in
the 290 tonne Cube 2900 and 460 tonne Cube 4600 machines offer generous mould installation spacing of 1,900mm and 2,400mm respectively and distance between the tie-bars of 820mm and 1,020mm. The second injection unit is placed above the moving mounting platen. The new machines are suitable for moulds weighing up to 16 tonnes.
At K2016, Arburg demonstrated an Allrounder Cube 2900 producing 32 two-colour flip-top closures for Pril washing-up liquid bottles from Henkel in a cycle time of around 8.5s. Compared to a
hydraulic cube machine, the show machine used around 25% less energy. The weight of the two-component PP moulded parts was 3.2g. The servo-electri- cally rotating cube mould from partner
Foboha featured independent sliding axes and fully automated removal and set-down system. The Cube design allows moulded parts to be removed and lids flipped without impacting on cycle time. Arburg says cube mould technology is of particular
interest when several conventional machines would be needed to meet the required sales volume because twice the number of cavities are available from the same sized clamp. Output can, therefore, be doubled. In addition, all four sides of a cube mould are available for production so individual process steps, such as mould filling, cooling and part removal, can be implemented simultaneously. Other processes, such as insertion, assembly or testing, can also be integrated without
Below:
Arburg’s newly introduced Allrounder Cube is designed
specifically for cube mould applications
Left: These flip top closures were produced by Arburg on a Foboha cube mould at K2016
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