Plastic Recycling Machines: Sorting (Part 2)

Plastic Recycling Machines: Sorting (Part 2)

In our previous article about plastic recycling machines we already explained several machines for sorting and separating different plastics and waste materials. We talked about the tire debeader, bale breaker, label separator, sorting table and color sorting machine. Today we continue with some more separation and sorting machines.

Magnetic Separator


Often plastic and rubber waste can contain steel parts that were integrated in the original product or that were mixed during the waste collection process. The steel parts can not only degrade the quality of the recycled product but also damage machines that were not intended to process steel parts. A magnetic belt running above a conveyor belt can pick out all these steel parts and collect them in a container for disposal.

Metal Detector


Despite many efforts to clear the plastic waste from metal contaminants by means of automatic or manual sorting, there still can end up some metal parts in the material flow at the entrance of the recycling line. To ensure high quality recycled plastic and protect the machines from damages, a metal detector can be installed at the beginning to stop the input flow when a metal part is detected so it can be removed before any damage or quality issue occurs.

Non-Ferrous Metal Separator


Plastic products can often contain metal parts like aluminum, messing or copper locks or joints. In addition, could aluminum cans have found their way in between plastic bottles waste. These metal contaminants can have bad influence on the quality of recycled plastic or rubber. To remove these metal parts from the plastic or rubber waste, a special technique is used that creates an electro-magnetic field that expulses conductive objects and collects them in a separate container.

Vibrating Sieve


A vibrating sieve separates particles based on their size. This can be particles of the same material to ensure a certain particle size or it can be to separate dust and fibers from the actual product. The perforation of the sieve decides the size of the particles that can pass though. The vibration of the screen takes care of a smooth flow of material and a qualitative separation of the smaller particles.

Metal-Plastic Separator


Certain products contain equal amounts of metals and plastic. This is the case with electric cables for example where the aluminum or copper core is completely covered in rubber and plastic. These plastic and metal fractions are bound so closely together that the only way to separate them is to cut the product into tiny particles. After cutting the particles can be separated based on their different mechanical characteristics. This separation is realized with an inclined vibrating screen that uses the natural frequency to guide the metal and plastic parts into different directions.