Step dryer for dewatering and drying

Important part of recycling plastics is a dewatering process and subsequent drying process. B+B designs and supplies a combination of innovative vertical dewatering equipment and a dry system named step dryer.

Residual moisture levels in the range of 0.4 - 0.06 wt% can be attained for thermoplastic granules in virgin production processes such as polycarbonate, polyethylene, polyamide, polypropylene, and polystyrene. Our engineers can aim for even lower numbers upon request.


Contrary to a regular dewatering machine, or plastic sludge dryer, the step dryer, designed by B+B, is fitted with both a step-shaped basket screen and rotor.

The material stream of plastic granules or flakes and water enters the lower part of the step dryer and is transported throughout the process by conveyor vanes. After the first step of separating the splash water, the granulated or flake material stream is accelerated by inertial forces resulting in an optimal separation of residual adherent water. In the last step, the static pressure of air in the upper part of the dryer prevents any excess water to exit with the dried material.

The Step Dryer features include:

  • high-quality dewatering and drying performance of liquids and impurities
  • step-shaped basket screen and rotor
  • automated cleaning device
  • high throughput performance
  • delicate material treatment
  • no fan required
  • residual moisture content flakes < 1% w/w
  • residual moisture content granules < 0.4 - 0.06 w/w
  • compact design
  • easy maintenance
  • low operating costs

Please download the leaflet Step Dryer for further technical details. Contact us.

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