PROCESSING | SMALL BATCHES
Left: Coperion’s STS 25 Mc11 twin-screw
laboratory extruder now has a screw
speed of 1,200r/min and outputs up to 100 kg/hr
screen carrier plate that can be easily removed from the die head by just loosening two bolts.
Lifting throughput To extend the process window of its STS 25 Mc11 twin-screw laboratory extruder, Coperion has increased the screw speed from 900 to 1,200rpm. The company says this makes it well suited for recipe development and basic scientific research with small batch sizes of 2kg while being able to reach throughput rates of up to 110 kg/h. “The STS 25 Mc11
has a simple design, is
operator-friendly and easy to clean,” says Peter von Hoffmann, General Manager Business Unit Engi- neering Plastics & Special Applications at Coperi- on. “By having the same screw diameter ratio Do
/Di
of 1.55 and the same maximum specific torque Md/a³ of 11.3 Nm/cm³ as the whole STS Mc11 extruder series, production parameters can be reliably scaled up to larger STS units.” Last year, Polimer Teknik presented its Scientific Serie compounders, which were designed as
laboratory machines for R&D applications as well as for optimising new product formulations. The poex T16 model was the first in the new series (the 16 refers to the L/D ratio). At the time of the launch, the company said screw and barrel materials are chosen depending on the application conditions and the materials to be processed. In addition, and depending on the process conditions such as very low viscosity chemical reactive extrusion where extra sealing protection is required, high temperature and abrasion resistant gaskets are used between the sleeves. Various other options can be fitted, again depending on the process. The company now says that, due to high demand
on different capacities and barrel type, it has also decided to offer larger units with a clam-shell system as an alternative to a modular segmental barrel construction. The clam-shell system provides full and easy access to the process section by opening the divided barrels horizontally. “Thus, the system supplies both high flexibility in operation and easy
Right: Polimer Teknik’s poex T27 compounder is now available with an easy-to-clean clam shell barrel system
IMAGE: POLIMER TEKNIK
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IMAGE: COPERION
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