Most of the packaging films used these days are either polyethylene or polypropylene or co-extruded sheets of both these polymers.for recycling these polymer mixtures selective dissolution methods are employed.
Basically the process is outlined as below:
1.the mixed plastic sheets are collected,crushed into smaller area and washed with detergents to remove contaminants like dust,food scraps and other clinging particles.
2.The cleaned sheets are shredded completely into fine flakes.
3.flakes are separated into PE and PP by selective dissolution methods using a suitable solvent to dissolbe any one polymer ans so the other is separated out.
4.the separated polymers are reprocessed separately in extruders and the extrudates are pelletised and reused for various other applications.