Extrusion coating

Method for applying a thin plastic layer to a carrier material to improve barrier properties.

What is extrusion coating?

Areas of application

Process & Quality

01 What is extrusion coating?

Extrusion coating is a process in which a thin layer of molten plastic is applied to a carrier material – such as paper, cardboard, aluminium foil or another plastic film. The molten plastic is extruded through a slot die and applied directly to the substrate. After cooling, a solid bond is formed with improved barrier and sealing properties.

02 Areas of application

Extrusion coating is used to equip packaging materials with additional protective functions. Typical applications include moisture-resistant packaging for the food industry, chemical-resistant coatings for industrial packaging, as well as heat-sealable layers on liners and bags. In combination with barrier plastics such as EVOH or PA, high-quality oxygen and aroma barriers can also be achieved.

03 Process & Quality

Crucial to the quality of extrusion coating are the melt temperature, the extrusion speed, the nip gap and the cooling. The layer thickness typically lies between 10 and 50 micrometres. A prerequisite for good adhesion is often pre-treatment of the substrate by corona or flame treatment. The process control must be adapted to the respective material combination.

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