Extrudex Kunststoffmaschinen GmbH, a maker of single-screw extruders in Mühlacker, Germany, introduced the VR-3 control unit, which automatically produces a constant vacuum in the calibration bath of an extrusion line.
The VR-3, equipped with a Siemens programmable logic controller, ensures that the pre-set vacuum value is consistently maintained during production — even when seals wear and pump performance is impacted by warming.
The controller ensures vacuum generation via venturi systems, the regulation of the outer diameter of tubing using vacuum control, process water temperature and the generation and retrieval of important process data.
Extrudex said the VR-3 can be retrofitted to an existing vacuum calibration bath.
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