SURFACES | TECHNOLOGY
facilitate demoulding must be taken into account. All bounda- ries must be raised; the struc- tures should overlap seamlessly into the mould geometry. These specifications require expertise and advice from engraving specialists. For example, the production of a
structured optical sheet made of Covestro Makrolon LED 2245 involved the creation of surfaces with optical requirements as functionality. The series parts weighing 7.5 g were produced on a hydraulic Allrounder 170 S with a clamping force of 180 kN in a cycle time of around 50 s. A single mould with an insert from Innolite was used. The structuring was applied to the optics with the aid of ejector stamping. Special features were nitrogen flushing at the feed and upstream material dedusting. The system pro- gressed into digitalisation through the use of Arburg’s
4.production assistance package, which standardises special processes, enabling complex mould technology to be quickly mastered. External indications of the functioning surface structure of
IMAGE: ENGEL
In a demonstration on Engel’s stand at Fakuma 2021, interactive IML labels from MCC Verstraete are
used for the production of margarine tubs, based on technology from
Digimarc. The food containers have a wall thickness of 0.4 mm including the label and are produced on Engel’s new E-speed 420/90 injection moulding machine with integrated IML
the parts were various display patterns that could be projected onto a surface depending on the incidence of light. The production of high-gloss surfaces also
originated as a requirement from the automotive sector, says Arburg. To achieve this without the conventional downstream (and therefore costly) processes such as painting, dynamic mould temperature control is used. This means that, unlike conventional injection moulding, the mould temperature is not constant over long stretches dur- ing the process. Instead, the mould is alternately heated and cooled in a defined manner. This allows high-gloss surfaces to be produced without further
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