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INNOVATION | SUSTAINABILITY


Right: At K 2019, an Engel Duo 3660H/ 1560W/450 combi injection moulding machine will make transport boxes contain- ing high levels of recyclate using the Skinmelt coinjection process


occupy a leading role in the areas of recycling, upcycling and recompounding of plastics. KraussMaffei is enhancing its joint effort with partners and customers to develop new business units regarding the reuse of plastics.” The circular economy will also


feature strongly on the Engel stand at K 2019. Stefan Engleder, CEO of Engel Group, says: “It is my personal concern to contribute to establishing a circular economy for the plastics industry, which bears a global responsi- bility that can only be met by companies working together. I therefore welcome the focus on circular economy at the most important international industry event. K will give this subject even more impetus… Circular economy is an innovation driver.”


At the show, Engel will have a strong focus on


processing recycled material, improving process stability, and also on the trend towards design for recycling.


Process stability “The stability of the injection moulding processes is key to being able to use recycled materials, also for higher quality products,” says Günther Klam- mer, head of the Plasticising Systems division and Circular Economy expert at Engel Austria. Noting that recycled material is naturally subject to greater batch variations than virgin material, he says Engel’s intelligent iQ weight control assistance system, which will be used on the company’s stand to process recycled ABS, can significantly reduce this variation on the process. The software, part of Engel’s Inject 4.0 program,


ensures a constant melt volume during injection and thus a consistently high product quality, “even with strongly fluctuating raw material quality,” Klammer says. “Intelligent assistance opens the door for recycled materials to a far broader range


Engel’s iQ system counteracts changes in melt viscosity to keep shot weight almost constant.


PHOTO: ENGEL


of applications. Industry 4.0 is an important enabler for the circular economy.” Another approach to using recycled materials


more widely is sandwich components with a core of recycled material inside a skin of virgin material. This concept is quite old of course, but injection moulding technology improvements are helping to make the skin thinner and the core fatter. Engel points out though that more products need to be designed for sandwich moulding. The proportion of recycled material that can be used in the core is essentially determined by the geometry of the moulded part and the flow pattern in the cavity, the company notes. It says that trans- port boxes that it will be producing at its stand using its Skinmelt process pose a particular challenge in this respect. Even so, recycled content is more than 50%. Engel says Skinmelt makes it possible to achieve high recycled content levels, even when working with complex component geometries. Unlike classic coinjection, the Skinmelt process involves fusing the two melts prior to injection, with a small extruder for each shot pushing virgin material into the front of an injection unit process- ing recyclate. This means that when the plasticating screw advances, the virgin material is first to reach the cavity, with the recyclate coming along behind to push it against the cavity walls to form the skin of the part. “Excellent reproducibility in the moulding


Image: Engel 22 INJECTION WORLD | July/August 2019 www.injectionworld.com


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