Pipe and profile extrusion is defined as a process of forcing the polymer melt through a shaping die. The extrudate from the die is sized, cooled and the formed pipe is pulled to the winder or a cut off device. Prior to this, the plastic material in the form of polymer granules is fed into the hopper, conveyed by a rotating screw through a long cylindrical barrel. This is subjected simultaneously to high temperature and pressure, forcing the melt through the die at a predetermined rate. After PVC, PE is the most widely used thermoplastic piping material.
Typical challenges in recycling:
The main challenge lies in the length of the extruded products, commonly pipes and profiles are metered off at 6m length. ZERMA offers a solution for for all parts accumulated during extrusion processes.
For thin walled PVC pipe and profiles the GSP pipe and profile granulators provide a single step solution. Due to their low feeding height these granulators are especially well suited for the grinding of long parts such as window profiles or small diameter pipes. Even at lengths of more than 6 m these parts can be fed easily into the almost horizontal hopper.
For pre-cut pipes of medium diameter the granulators in the GSH series are a one step solution, here the machines are equipped with a special pipe hopper ensuring that the pipes are entering the rotor at an optimal angle for best results. Alternatively these pipes can be processed in a two step shredder/granulator combination as well.
The best recycling solution for large diameter pipes and profiles are the ZERMA ZRS shredders specifically designed for this task, in these shredders pipes of up to 1200 mm diameter and 6 m length can be processed safely and efficiently.
To create PVC powder from the ground pipes or profiles the Pulverizers of the PM series can be used.