machinery feature | Twin-screw extruders
models to design new E-Series die heads and die plates. This ensures that output is evenly distributed across the entire die plate. The E-series uses a modular split-body construction with the fl ow channels ma- chined into the upper die body, which can easily be changed for different material characteristics. The die plates are retained using a mechanism that allows for rapid changeover.
Maris suggests that different OD/ID ratios are better suited to different compounding applications
range and productivity of its CXE series extruders with high-performance screw shafts and what it says are state-of-the-art strand dies. A new machine size is under development to meet the production require- ments that fall between the CXE92 (92 mm screw diameter) and CXE133 (133 mm) models. Company president Bob Urtel says that the machine will be ready for delivery by NPE 2015. Increasing torque density to above 15 Nm/cm3
for
CXE-series twin-screw extruders is achieved using special grades of maraging steel for cold-forming screw shafts. These grades of steel are more than 50% stronger than most commonly used shaft materials. Urtel says the new shafts can also be provided for other OEM machines to eliminate shaft breakage or twisting. Increased extruder capacity requires larger die heads with wider dies for strand pelletizing applica- tions. Century engineers use the compound rheological properties for each customer’s product portfolio, as well as their operating conditions, in computer fl ow
Three years after it unveiled the ZSK Mc18 with a torque density of 18 Nm/cm3, Coperion launched its latest update at K 2013 – the ZSK 32 Mc18 Smart. This features various improvements including a new control system, CSpro, a completely redesigned die head, and a retrofi ttable high-resolution torque measurement unit. Coperion says ZSK Mc18 units are very cost-effective, even when processing small batches with frequent product changes.
The ZSK 32 Mc18 Smart is readily accessible and easy
to clean, thanks in part to its screw shaft axes being only 800 mm above fl oor level. Ancillary units can be mounted by a swivel arm and can be operated from fl oor level without the need for step ladders, platforms or overhead cranes. The feeders are mounted on a platform on the drive unit or on the swivel arm of the ZS-B twin-screw side feeder. The Smart design version is available not only for the series (sizes 18, 26 and 32) but also for the
ZSK Mc18
ZSK Megavolume Plus series (sizes 27 and 34). The new SK 58 and SK 70 extruder die heads feature
a completely redesigned heating system, with a very even temperature across the entire die plate, even at very high throughput rates. The CSpro control system is available in a basic version for all standard functions, and a medium version with additional features, such as order/batch and formulation management. Coperion K-Tron gravimetric feed systems can also be fully integrated into the control system. The medium version
Century uses simulation programs to optimize the internal fl ow path of the die head and die plate
32 COMPOUNDING WORLD | March 2014
Century’s new E-Series strand die uses a modular design to adapt to specifi c compound properties
www.compoundingworld.com
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