Recycling Mixed Rigid Plastics


Recycling mixed-rigid plastics differ from other recycling process such as PPPE or PET, due to the fact that the in-feed material contains multiple types of plastics. It is important to follow industry guidelines on the types of materials applicable for bailing and recycling in this way, as a failure to do so may result in bails being rejected.

mixed rigid plastic plant

To gain maximum value, many waste management companies are choosing to install a system to produce plastic granulate from bailed mixed rigid plastics. Rotajet have installed many recycling lines for processing mixed rigid plastics; allowing them to maximise their profit margins and optimise their business. To account for our customers’ varying needs, Rotajet offer standard recycling lines for processing mixed rigid plastics in varying capacities from 500Kg to 3MT-

In typical situations, a shredder is used for the initial size reduction of the material. The feed stock is normally reduced down to a shred of 40-50mm.

RJ-PW75 | Prewasher 
This powerful scroll washer is used to remove the bulk of the contaminants such as dirt, dust and paper fractions mixed in with the assorted rigid plastics.

RJ-HKS70 | Sink Float Tank
During this process, Polyolefins and plastics are separated according to their specific density. Plastics with a specific density higher than 1.00 become the sinking fraction whilst the Polyolefins become the floating fraction.

RJ-MD75 | Mechanical Dryer
 Both the sinking and floating fractions are then dried separately in a high-speed mechanical dryer.

RJ-ZZ | Zigzag Separator
 Foam and polystyrene are removed from the floating fraction, whilst small metal, dirt and glass particles are removed from the sinking fraction.

NIR Sorting
Both streams are then passed through NIR sorting separately. The floating fraction is split into PE and PP, whilst the sinking fraction is sorted into PVC, ABS and PET.

Granulators are then used on each of the resulting streams to create an even particle size, suitable for extrusion.

Complexities of Recycling Mixed Rigid Plastics

Mixed rigid plastics are made up of multiple plastic types that can be recycled in large quantities. This can inherently introduce new complexities as well as benefits to recycling, especially when compared to the recycling of individual plastic types. Despite this, recycling mixed plastics on a commercial scale is completely viable, and with its level of demand and market value can be a profitable commodity if managed properly. When dealing with mixed rigid plastics, a new level of involvement is introduced to the separation stage of the recycling process.

This is because the combination of different plastic types must be separated from various contaminants such as; glass, paper, and dirt among others. In comparison, when separating one type of plastic from these contaminants, the separation medium such as a Sink Float Tank can be accurately adjusted to filter down to a single quality product.

Rotajet has taken all of these considerations into account to design a fully optimised and accurate solution to recycling mixed rigid plastics. These machines have been standardised to meet industry requirements and guidelines on recycling mixed rigids, and are capable of managing up to 3MT of infeed material. 

Contact Rotajet

We aim to get back to any enquiry within 12 hours, so please do contact us if you are interested in a specific machine or would like to discuss a cleaning requirement. Our friendly team are happy to help with email or call +44 (0) 1924 271446.

Recycling Plants

Rotajet produces a full range of recycling plants for taking care of; PP, PE, PET, Containers, WEEE, Film, Batteries, and Mixed Rigids. This video shows a full plastic recycling line.

Rotajet Systems Ltd
Unit 14
Flanshaw Way
West Yorkshire

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