Plastic Prewasher

Our specialised plastic washers protect upstream equipment by removing bulk contaminates prior to size reduction, separation, washing and transport.

Operation of Plastic Prewashers

Plastic prewashers are a screw auger washing system and are typically used for removing high loads of contamination prior to friction washing. 

Rotajet PW plastic pre-washers are fitted with a wash section in which liquid is sprayed at high pressure and flow. The resulting wash liquid impinges on the surface of the plastic being transferred through the incline conveyor. The impact from the spray removes surface dirt, grease and other contaminants from the plastic. 

For more demanding cleaning applications, a heated detergent solution can be used. The wash liquor and contamination drains down the incline screw into a vibrating sieve. The vibratory sieve filters the solution, which is then pumped to storage tanks for reuse. To maintain operating temperatures, heating can be fitted to the bulk storage tanks.

The Rotajet PW can be manufactured in various sizes, from a small system capable of 500 kilos per hour, up to machines with throughput capacities of 6 tons per hour.

The Rotajet PW pre-washer is used for removing contaminants from PET bottles, and HDPE bottles prior to wet granulation. The removal of contaminants with a pre-washer will increase the blade life of the wet granulation system.

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Contact Rotajet

We aim to get back to any inquiry within 12 hours, so please contact us if you are interested in a specific machine or would like to discuss an individual cleaning application. Our friendly team are happy to help via email at or by phone on +44 (0) 1924 271446.