Edition 02 I 2012

>> INFOCUS – new ZSK Mc18 for US test lab.

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ZSK 32 Mc18 for Coperion’s test lab in Ramsey, USA

High torque twin screw extruder now available for trials

Coperion has just added a ZSK 32 Mc18 intermeshing, co-rotating twin screw extruder to its test lab in the Ramsey, NJ facility. The ZSK with 32 mm screw diameter stands out for its specific torque of 18 Nm/cm3 and is supported with state-of-the-art processing equipment to ensure that lab customers can run trials that fully exploit the benefits of Coperion’s new ZSK Mc18 series.

With a torque increase of 30 % in comparison with its predecessor ZSK Mc PLUS, the ZSK Mc18 achieves up to 30 % greater throughput rates and therefore ensures maximum productivity. Supporting equipment of the new ZSK 32 Mc18 in our US test lab includes the Feed Enhancement Technology (FET), ZS-EG twin screw side devolatilization units, and first-class metering, pelletizing, and control equipment.

Ideally suited for a wide range of processing applications

The ZSK Mc18 provides users with a wider operating window than its predecessor models ZSK Mc PLUS or ZSK Mc, especially in applications where the customer can make use of the extruder’s high torque of 18 Nm/cm3. The increased specific torque allows processors to run the ZSK at a higher degree of screw fill resulting in higher throughput rates (Fig. 1) at a lower energy input (Fig. 2) and therefore lower material discharge temperature.

This makes the ZSK Mc18 the ideal choice for processing previously torque-limited products such as engineering resins or glass-reinforced compounds. It can be especially beneficial when processing heat and shear sensitive materials. The higher degree of fill and lower energy input provided by the ZSK Mc18 enable processors to improve their product quality and increase productivity. Customers can experience up to 30% increase in throughput rates.

Abb. 1: Deutliche Durchsatzsteigerung mit dem ZSK Mc18
Fig. 1: Significant increase in throughput rates with the ZSK Mc18
Abb. 2: Deutlich verringerte Energieeinleitung und höherer Durchsatz mit dem ZSK Mc18
Fig. 2: Considerably reduced energy input and increased throughput with the ZSK Mc18

Peripheral equipment complements the performance

For applications with feed limitations – for instance filling with talcum, calcium carbonate or other fillers – the ZSK 32 Mc18 can be equipped with the Feed Enhancement Technology (FET). This unit allows product feed-rate optimization to increase feed material volume when processing powder bulk materials.

FET equips the feed zone with a porous, gas-permeable segment with an external vacuum applied, enabling the feed zone to take in as much as two to three times the volume of material, while reducing bulk density feed problems. Therefore, when processing low bulk density products, feed levels and output can be increased by up to 300% depending on the product while lowering specific energy input and improving compounding quality (Fig. 3).

Abb. 3: Deutliche Durchsatzsteigerung mit der FET Feed Enhancement Technology
Fig. 3: Significant increase in throughput rates with the FET Feed Enhancement Technology

Besides FET the ZSK 32 Mc18 can be equipped with a ZS-EG twin screw side devolatilization unit. It can help processors exploit the ZSK Mc18 performing capability, especially in the compounding of low-viscous melts and processes with high gas quantities. With a large free cross section for devolatilization, the unit is flange-mounted laterally on the process section, and is equipped with deep-flighted twin screws that keep the melt in the process section without product leakage even at maximum specific torque. Throughput increases of up to 30% with improved product quality can be achieved.

Further state-of-the-art equipment available at Coperion’s test lab in Ramsey includes metering equipment, underwater pelletizing and strand pelletizing equipment.

In June 2012, Coperion plans to add an additional ZSK Mc18 with 45 mm screw diameter to the test lab facility in Ramsey so that customers can also run trials on a larger machine.

Interested? Schedule a trial at our process test lab in Ramsey, NJ or visit us at NPE, where we will show a ZSK 45 Mc18:
April 2-5, 2012
Orlando, Florida
Booth no. 6463, West Hall, Level 2

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