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Extending the extrusion envelope

By Barry Copping
Posted 12 October 2012

New design and configuration options for extrusion lines offer exciting possibilities for greater versatility in extending the reach of the process – for instance in replacing both metals and more expensive composites by co-extruded plastics.

Machine innovations cover all product configurations – pipe, profile and sheet, and variable screw geometry can accommodate a wide range of materials on the same machine platform, from PVC and polyolefins to thermoplastic elastomers and engineering plastics.

On the materials front, ethylene-vinyl acetate (EVA) is on the advance as a raw material for technical sheets and foils, and KraussMaffei Berstorff is catering to this trend with a new sheet extrusion system. The company cites excellent optical transparency, and only 11% of the shrinkage observed with current materials used in the same application.

Athlone Extrusions explains the technicalities behind its range of co-extruded multi-layer foil laminates. The acrylic/ABS materials have to meet the highest quality standards for premium furniture applications and take special colour effects well.

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