PET recycled on a Coperion reycling system

Inline Processing of PET

Coperion has developed a technology for the processing and direct extrusion of PET in which neither pre-drying of the materials nor crystallization and agglomeration of recyclates are necessary in comparison with conventional PET processing techniques. It enables the production of semi-finished products in one process step. Coperion designs complete recycling systems.

With our many years of experience we ensure smoothly interacting process steps from material handling to feeding, twin screw extrusion and cooling of the product. Our plants ensure maximum productivity and efficiency.

Advantages of processing PET with twin screw extruders in comparison with the single screw method

  • Very high quality of the end product because only a minimum iV degradation occurs during processing and the crystal clear material does not become yellowish
  • High flexibility because recipes and colors can be changed very quickly due to the good self-cleaning behavior of the twin screw extruder
  • Much simpler logistics because pelletized new product and different regenerates (ground product, agglomerates, flakes) can be processed together even if they have different iV values
  • Energy and time savings as the pre-drying and crystallization are omitted in the single-stage production process

A powerful, energy and time-saving innovation: COREMA® combines the benefits of recycling and compounding in a single plant. This system produces tailor-made tunable recycling compounds for especially high quality applications.

Recycling raw materials such as PP fleece, PE edge trim, PA fibres are transformed into a filtered melt using proven, robust EREMA technology which is then fed directly to the Coperion co-rotating twin screw extruder.

With its excellent mixing and gas removal properties, this part of the system can handle all compounding tasks. Besides the dosing of a wide variety of additives, high amounts of fillers and reinforcing agents can be admixed.

Comprehensive product range


Extruders and Compounding Machines

Coperion twin screw extruders are at the heart of the direct recycling process. With their good processing properties and high devolatilization performance Coperion’s twin screw extruders are suitable for the processing of new materials and of all types of ground products or recyclates as well as mixing of these materials. Films, fibers or injection molding pellets can be produced inline in one process step.

Coperion K-Tron single and twins screw feeders over an extruder inlet

Feeding Equipment

Coperion K-Tron feeders are ideal for accurate feeding of raw ingredients into an extrusion process.  The wide range of products available includes twin screw feeders, single screw feeders, bulk solids pumps, vibratory feeders as well as other types in a variety of sizes and configurations. The K4G blending station allows up to six feeders to be arranged closely around an extruder inlet. Coperion K-Tron feeders ensure a continuous, uniform infeed with a very tight short-term accuracy and repeatability. Our engineers can help you find the right solution for your process.

Volumetric & Gravimetric Feeders

Material Handling Equipment

Our material handling systems are designed for the challenges of conveying recycled materials. Our designs can handle a variety of products from the flake materials to your finished pelletized products. Using cyclones or filter receivers we can help with a solution for your recycling process. 

Process Equipment

Plants and Systems

Due to our comprehensive engineering expertise we design compounding lines for recyled products that ensure smooth interaction of all process steps – from material handling to feeding, twin screw extrusion up to pellet treatment and finished product handling.


From single spare parts to total service agreements Coperion and Coperion K-Tron provide comprehensive services for PET processing lines – all with focus to optimal performance of your plants and systems.