Coperion’s ZSK Pharma Extruder Series Now Available in Size 26 and with New K3 Pharma Feeder

As a result, Coperion now offers the ZSK 26 twin screw extruder that fulfills all of the pharmaceutical industry’s guidelines and covers throughputs of 5-20 kg/h, depending on application and materials to be processed. The ZSK pharma extruder series is now available with new, completely integrated Coperion K-Tron K3 pharma feeders.

Combined with the already well-known characteristics of its ZSK pharma extruders, Coperion has equipped the ZSK 26 with some new developments. Like the ZSK 18, the ZSK 26 pharma extruder’s process section is designed to be free hanging. Thanks to this new design, the product contact parts are optimally accessible from all sides, greatly simplifying machine dismantling and cleaning. The dual-cycle cooling system, which safeguards cooling of both the process section as well as the motor by using water, has now been fully integrated into the extruder’s base frame. Likewise, the vacuum pump as well as the KCM control unit for Coperion K-Tron’s highly accurate feeders are housed in the base frame. Together, these measures markedly reduce the entire extrusion system’s space requirement. Moreover, they enable simple, quick extruder startup at the operator's location and facilitate production, cleaning and maintenance by separating product-contacting and non-product-contacting machine areas.

Reproducible, High Product Quality
All Coperion ZSK pharma extruders are compactly designed, easy to service, and optimally accessible for cleaning and maintenance. For the highest possible flexibility when feeding liquids and solids as well as during mixing and product melt devolatilization, Coperion uses a modular system for the extruder’s process section, comprised of several barrels in which self-cleaning screws co-rotate. The D_o/D_i (outer-to-inner screw diameter) of 1.55 enables secure scale up within the entire ZSK pharma extruder series. The 11.3 Nm/cm³ specific torque enables high throughputs at low screw speeds and thus low product temperatures. The product components’ thermal load in the temperature-controlled ZSK process section is also low. Complete integration of the ZSK pharma extruders with Coperion K-Tron’s newest line of pharmaceutical feeders ensure exact adherence to the formulation and reproducible high product quality.

In the case of the ZSK 26 pharma extruder, the solid material feeder is located on a swiveling platform directly above the inlet. Fluid ingredients are fed via liquid loss-in-weight feeders that are installed on a separate frame next to the extruder.

As proudly stated by Stefan Gebhardt, General Manager Business Unit Food & Pharma at Coperion: “With the ZSK 26 in pharmaceutical design, we have succeeded in expanding our proven portfolio of pharma extruders by one important throughput range. We have been able to successfully carry the positive resonance of our larger and smaller machine sizes in pharmaceutical design over to the new ZSK 26. At the same time, we’ve equipped the extruder with more features to simplify operation handling even more. In combination with our highly accurate K3 pharma feeding systems, we are now in a position to realize complete extrusion systems for continuous production of pharmaceuticals in practically any throughput range.”