Why It Is Critical to Producing High-Quality Recycled Plastic
As plastic recycling technology continues to evolve, recyclers are under increasing pressure to produce cleaner, higher-quality recycled materials. While washing and separation often receive most of the attention, plastic drying remains one of the most important stages within any recycling process.
Effective plastic drying helps reduce moisture content, improve extrusion efficiency, increase product quality and minimise operational costs. Without adequate drying, even the cleanest plastic can cause downstream processing issues that reduce profitability and compromise the quality of the finished product.
At Rotajet Systems, we design and manufacture a range of plastic drying solutions that help recycling facilities achieve the moisture levels required for pelletising, extrusion and material reuse.
Why Is Plastic Drying Important?
During the washing process, plastics are exposed to significant volumes of water used to remove contamination such as food residues, labels, adhesives, oils and dirt. While this cleaning stage is essential, it leaves the material carrying moisture that must be removed before further processing.
Insufficient plastic drying can result in:
- Reduced extrusion performance
- Increased energy consumption
- Poor pellet quality
- Material degradation
- Inconsistent product quality
- Higher processing costs
- Reduced value of recycled material
By incorporating the correct plastic drying technology, recyclers can significantly improve plant performance while producing a higher-value end product.
Choosing the Right Plastic Drying Method
Every recycling application is different. The type of plastic, contamination level, throughput requirement and desired final moisture content all influence the most suitable drying solution.
Rotajet offers several plastic drying technologies designed to suit different applications and production requirements.
RJ-Turbo Friction Dryer
The RJ-Turbo is Rotajet’s high-speed friction dryer, designed to remove moisture and surface contamination simultaneously.
Using a powerful rotor fitted with 32 individually adjustable paddles protected by chromium carbide wear plates, the RJ-Turbo generates significant centrifugal force as material passes through the machine. This action forces moisture through a perforated screen while retaining the plastic inside the drying chamber.
The result is highly effective plastic drying combined with additional cleaning performance.
Key benefits include:
- High-speed drying action
- Moisture reduction and cleaning in one process
- Adjustable performance to suit different materials
- Suitable for rigid plastics and film
- Standalone or integrated installation options
- Low maintenance design
The RJ-Turbo can also be configured with spray jetting and recirculation systems where additional washing functionality is required.
Mechanical Plastic Dryers
Mechanical dryers are among the most widely used solutions for plastic drying due to their efficiency and relatively low operating costs.
Rotajet manufactures both horizontal and vertical mechanical dryers that utilise centrifugal force to separate moisture from plastic flakes and granules.
As material enters the machine, high-speed rotor paddles force the plastic against dewatering screens. Water passes through the screens while the dried material is discharged for further processing.
Mechanical plastic dryers can reduce moisture levels to approximately 1%, making them ideal for many recycling applications.
Benefits include:
- Efficient moisture removal
- Continuous operation
- High throughput capabilities
- Low energy consumption
- Compact footprint options
Thermal Plastic Dryers
Certain applications require even lower moisture levels before extrusion or pelletising. In these situations, thermal drying provides the most effective solution.
Rotajet thermal dryers use high-volume airflow combined with controlled heating to further reduce residual moisture following mechanical dewatering stages.
Thermal drying can achieve moisture levels as low as 0.5%, helping recyclers produce material suitable for demanding downstream processes.
Advantages include:
- Extremely low final moisture levels
- Improved extrusion stability
- Enhanced pellet quality
- Suitable for demanding applications
- Consistent drying performance
Screw Compactors for Film Drying
Plastic film presents unique challenges during plastic drying due to its large surface area and tendency to retain water.
To improve efficiency, Rotajet offers screw compactors that mechanically squeeze excess moisture from film before it enters the final drying stage.
This reduces drying times, lowers energy consumption and improves overall plant efficiency.
Screw compactors are particularly effective when processing:
- LDPE film
- LLDPE film
- Agricultural film
- Flexible packaging
- Post-consumer film waste
Integrating Plastic Drying into Recycling Lines
The most effective recycling facilities treat plastic drying as part of an integrated process rather than a standalone operation.
A typical recycling line may include:
- Size reduction
- Washing
- Friction cleaning
- Sink-float separation
- Mechanical drying
- Thermal drying
- Material handling
- Storage and bagging
By ensuring each stage works together, recyclers can maximise throughput, improve material quality and reduce operating costs.
Why Choose Rotajet for Plastic Drying?
Rotajet Systems designs and manufactures plastic recycling machinery in the UK, supplying both standalone equipment and complete recycling plants.
Our engineers work closely with customers to understand material characteristics, production requirements and target moisture levels before recommending the most suitable drying solution.
Whether you require an RJ-Turbo friction dryer, a mechanical dryer, a thermal dryer or a complete recycling system, Rotajet can provide the expertise, equipment and technical support needed to achieve reliable results.
Free Material Trials
The most effective way to determine the correct plastic drying solution is through testing. Rotajet offers free material trials, allowing our engineers to evaluate your feedstock, assess moisture levels and recommend the most suitable drying technology for your application.
