PE-extrusion

In PE (polyethylene) extrusion coating, a thin layer of molten PE is applied to the paper or cardboard. The PE coating improves the barrier properties of the substrate. Among other things, it makes it grease- and moisture-resistant and sealable, and also ensures that the products do not come into contact with the paper.

For PE extrusion, the paper or cartonboard is fed through a machine. Polyethylene resin is melted and extruded through a die, and applied in a thin layer to the substrate. When it has cooled, the polyethylene layer solidifies into a coating.

Polyethylene is highly recyclable, and intensive research is being conducted to improve the recyclability of materials with PE extrusion. Coated materials – including those with PE extrusion – can pose problems for recycling because the different layers have to be separated. Ongoing efforts in the field of sustainability and recycling are aimed at making packaging materials with PE extrusion coating more environmentally friendly.