battenfeld-cincinnati: Synergies with Davis-Standard Enable Innovative Extruder Concept

Singe screw extruder BC 120-40 with Dual Vent Technology (©battenfeld-cincinnati)

Efficient processing of different raw materials, almost no material pre-treatment, and high quality of the films and sheets to be produced – battenfeld-cincinnati meets these demands for modern resource management with the new BC 120-40 DVT single-screw extruder. The first extruder with the innovative Dual Vent Technology was on display at K 2025.

Double degassing is nothing new in single-screw extruders. However, until now, the degassing connections were located directly next to each other and served to increase the overall degassing capacity at a single area. In contrast, Dual Vent Technology (DVT) creates two independent degassing areas along the extruder's processing unit. This enables more effective removal of gases.

The completely redesigned screw concept enables the conditions to separate degassing chambers without changing the familiar user-friendly operation of the single-screw extruder. “Combining our expertise within the group, we have succeeded in developing an innovative concept that combines two separate degassing zones on one screw,” explains René Hartmann, Regional Sales Manager at battenfeld-cincinnati.

Thanks to this separation, volatile substances with low partial pressure can be effectively removed from the melt in the first intensive degassing zone, while volatile substances with higher partial pressure can be removed in the second zone. This enables to remove significantly more moisture and other volatile components from the melt than with one degassing zone. This in turn ensures high product quality, among other things, by preventing bubble formation. "For the processing company, this reliability means, on the one hand, that it hardly needs to pre-dry its material, thus saving on equipment and the associated acquisition and energy costs. On the other hand, the new double degassing extruder allows them to use untreated residues and regrinds and still extrude high-quality semi-finished products," says René Hartmann, explaining the increased flexibility in terms of material use.

With this further development, battenfeld-cincinnati is initially focusing on ABS processing; however, depending on the material and vacuum technology, other functions are also possible, such as the removal of odors using the new Dual Vent Technology.