Linear Thermoplastic Polyurethanes TPU

Ski boots made out of Linear Thermoplastic Polyurethanes TPU

Chemical Reaction Process

TPU is used in countless applications: technical components, housings for electrical devices, decorative trim parts for cars, sneaker soles, ski boots, housings for external car mirrors and many more.

Thanks to its modular design, the ZSK twin screw extruder is ideally suited to producing TPU. The chemical reaction process that turns the liquid raw materials into polyurethane takes place during constant mixing and kneading. In order to achieve the longest possible residence time in the extruder, Coperion has already designed ZSK extruders with process lengths of up to L/D = 68.

Thanks to the self-wiping profile of the ZSK twin screw extruder and the narrow residence time distribution, high product quality can also be guaranteed with long machine runtimes.

Typical set-up for producing linear thermoplastic polyurethane (TPU)

Comprehensive product range

Coperion ZSK 82 Mc18 Twin Screw Extruder


Coperion's ZSK extrusion systems are particularly suitable for the reactive extrusion process due to the excellent product handling and mixing properties. With our comprehensive engineering know-how we design the ZSK extruder exactly to meet the requirements of your process.

To produce TPU in the extruder the liquid raw materials are fed into the ZSK twin screw extruder infeed in the stoichiometric ratio via highly accurate liquid feeders. The reaction to polyurethane takes place in the twin screw extruder under constant mixing and kneading. Surplus reaction heat is dissipated through the barrel wall. Discharge takes place via a gear pump and a screen pack changer directly to an underwater pelletizer. The pellets mature into a ready to sell product in the downstream drying plants, mixing or storage silos.

Coperion Consulting


Coperion offers comprehensive services for extrusion systems. Our service structure comprises over 350 service engineers and technicians around the globe. Our spare parts store is one of the largest in the industry with more than 48,000 parts in the data base. These include both original Coperion spare parts and parts from other suppliers.

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