Fakuma exhibit: Injection compression moulding of IML thin-walled cups

At its stand 3101 in Hall A3, ARBURG will be offering trade visitors nine exciting exhibits plus a whole host of information on sustainability, digitalisation and automation in the world of plastics. The fact that high-quality injection moulding technology can be an alternative to thermoforming will be demonstrated by an electric ALLROUNDER 720 A "Ultimate", for example, using injection compression moulding to produce thin-walled IML cups that can be easily recycled after use.

IML cups only 0.37 millimetres thick

The exhibit uses a 4-cavity mould from Brink to produce thin-walled IML round cups from polypropylene (PP) using injection compression moulding. The flowpath/wall thickness ratio is 380:1. For process monitoring, the mould is equipped with six high-resolution inductive position measuring and embossing sensors. Four moulded parts, each weighing 10.4 grams and with a wall thickness of only 0.37 millimetres, are produced in a cycle time of 3.95 seconds. The plastic has a biomass footprint and ISCC-certified. Also integrated into the production cell is a side-entry robot from Brink that inserts the labels, removes the finished cups and stacks them on a conveyor belt.

Easy on resources and recyclable

With this particularly resource-efficient application for the packaging industry, special emphasis was placed on energy efficiency and on a part design that saves materials. Thanks to the all-electric packaging machine in combination with injection compression moulding, the energy footprint is improved by 20 per cent with a significant reduction in part weight from 13 to 10.8 grams. The special "Next Cycle IML" label can be completely separated from the cup's PP during recycling, so that the product can be recycled by type after use. In contrast to thermoforming, no pre-produced foils are used and no stamping waste is produced.

Injection compression moulding of IML thin-walled cups

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