Packaging film manufactured from recycled PET

Sharp Interpack has revealed that high-quality packaging film is now manufactured from recycled PET on a new line at its Bridgwater-based site.

The new line allows up to 100 per cent recycled PET sheet to be produced direct from hot caustic wash plants.

The operation is now further enhanced with a Power Back-Flush (V-type) screen changer from Kreyenborg - Germany that enables efficient cleaning of the screen packs without additional pressure from the extruder.

The system is particularly effective when processing high portions of recycled material with a high pollution degree such as PET bottle flakes.

The new line at Sharp Interpack has a capacity of 1,500kg/h, using 100 per cent recycled PET.

The feedstock, originating from consumer waste, is pre-cleaned in a washing line and then directly extruded, removing harmful substances from the plastic.

The process is covered by robust Pira certification and meets all European Union (EU) requirements.

A key line component for the processing of the recycled polymer is the melt filter.

In this extrusion line, a Kryenborg Power Back-Flush (V-type) screen changer automatically flushes filter screens independently of the extruder for interruption-free, constant-pressure extrusion.

With each back-flush, a constant quantity of material is discharged, so that in comparison to other systems, the material losses are very low and the screen life long.

The growing use of recycled polymers are required to meet strict EU regulations on plastics destined for direct food contact so there is a need to screen-out contaminants.

In the field of plastics extrusion any kind of contamination in the melting process is unacceptable, as it not only affects the quality of the product but also impedes the operating process.

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