In extrusion coating, plastic, paper or aluminum carrier films are combined with a thermoplastic layer to form a composite material which is bonded together.
The plastic which is to be applied as a coating, is first melted in an extruder and then applied by a horizontal slot die to the moving carrier web which may have been previously coated with a primer. The resulting composite then passes through a combination of chill rolls and press rolls to optimize surface and adhesion before being wound up in the final section.
Typical applications include beverage containers, flexible packaging, tubes and also cement bags.
Plastics processing methods
There are many ways from raw material to the finished product – here you will find them all.