Plastics and Recycling

Plastics & Recycling Vacuum & Low Pressure Solutions

In the plastics and recycling industry vacuum pumps and side channel blowers are widely used in various application processes. This includes extrusion, masterbatch and compounding, drying, solid and liquid state polycondensation (SSP/ LSP), pneumatic conveying, calibration, cooling, moulding, thermoforming and eps forming. At Elmo Rietschle, we apply our knowledge to match the right product or system to the specific demands of a given application.

Brochure | Sustainable Plastic & Recycling Solutions

Capability brochure to highlight Elmo Rietchle’s market-leading products and solutions for a wide range of applications in the plastics & recycling industry.




Typical Applications

Extruder Degassing

Extruder degassing is an important process step in various plastic extrusion methods during plastics production and recycling. The basic function
of vacuum degassing is to remove moisture, air inclusions, monomer residuals, solvents and reaction products from the polymer melt to obtain optimal
quality of the end product. Our experts will help to choose the right vacuum technology and package configuration according to the polymer and process


Hygroscopic materials such as PC, PA and PET to name just three, attract moisture from the surrounding air, so that dehumidification of the raw
materials before processing is essential for high quality of plastic products. More efficient systems employ air dryers where the air is conveyed by a
blower first to a heater and then directed through the polymer granules or powder for drying. A dehumidifier positioned in the return airflow removes
the moisture from the process air.

Vacuum Calibration & Cooling

Calibration units can determine strongly the visual and structural quality of the product. Vacuum calibration tables use vacuum pumps to force the
molten profile into the correct position at calibrator wall during the cooling. High water content requires a vacuum pump which is optimized for the water
carry over.


Pre-expanded polystyrene beads are first stabilized and matured in dedicated storage silos after being cooled and dried. In the next step beads are blown
into a mould by a side channel blower and then pressurized with steam and baked into moulded parts. A vacuum applied to the mould ensures
correct shaping, cooling and moisture extraction.

Pneumatic conveying systems

Plastic presses and extruders are automatically fed with the aid of blowers or vacuum pumps. A distinction is made between conveying by means of a vacuum and by means of pressure. Typically, a blower generates a partial vacuum in the material container and the granules are carried along with the air flowing through the hose line.

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