IN-MOULD DECORATION | PROCESSING
unit that is optimised for high performance. Thanks to high-precision servo motors from sister com- pany AMKmotion, high injection volume flows and injection speeds of up to 400mm per second could be achieved. The exhibit used a four-cavity mould from Brink to produce thin-walled IML round cups from polypropylene (PP). For process monitoring, the mould was equipped with six inductive position-measuring and embossing sensors. Four moulded parts, each weighing 10.8g and with a wall thickness of 0.37mm, were made in a cycle time of 3.95 seconds. The production cell also included a side-entry robot from Brink that inserted the labels, removeed the finished cups and stacked them on a conveyor belt. The use of injection compression moulding on an electric machine helped to improve energy footprint by 20% and reduce part weight from 13.0 to 10.8 grams. The flowpath-to-wall-thickness ratio was 380:1. This would normally need a very high injection pressure – at the expense of energy requirements and mould wear. However, injection compression moulding required a much lower injection pressure and could work with mould temperatures of 20°C rather than 12°C.
The special ‘Next Cycle IML’ label can be
separated from the PP of the cup during recycling, so the product can be easily recycled after use. In contrast to thermoforming, no pre-produced foils are used and no stamping waste is produced, says the company. Arburg ran a similar demonstration at its recent
Technology Days event, producing four IML lids – for rectangular margarine containers, each weigh- ing 6.5g with a wall thickness of 0.35mm – in a cycle time of around 3.5 seconds. Thanks to Recypeel technology, from iPB Printing, the label can be completely separated from the plastic in the recycling process. Here, the top layer of the label – including the ink – separates during recycling, leaving behind pure plastic that can be reused.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.kurz-world.com �
www.polyic.com �
www.imdassociation.com �
www.proell.de �
https://iml.mcclabel.com/en �
www.arburg.com �
www.ipbprinting.com
www.cabopol.com
sales@cabopol.com
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