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Duo remove plastic film

Bulk handling systems

Bulk Handling Systems (BHS) is offering its plastic film identification and removal system utilising NRT’s FiberPure optical sorter, with the option of a Nihot pneumatic extraction system.

Plastic film has long been a problem in MRFs, and there was a need for a technology that separated plastic film from high volumes of fibre with high purity rates. The combination of optical sorter and air extraction system creates a one-step approach, enabling operators to better capitalise on the evolving mix of fibre and film than with standalone equipment.

From single-stream to municipal solid waste, all 2D material coming from a BHS polishing screen is fed to the FiberPure using the full width of the acceleration infeed conveyor. By use of an air curtain, the material will stabilise on the belt.

The NRT in this case is set up to target film, depending on the material stream, to maximise recovery. This is the optimal point in the process for the identification of film types followed by their extraction. The optical sorter detects and ejects material in flight, and the plastic film fraction is aspirated via an opening above by the Nihot air extraction system.

Non-ejected material such as paper lands on a default conveyor and heavier plastics, such as partially filled plastic bags, are captured in the far chute.

At the end of the process, clean plastic film is captured in a Nihot rotary air separator, which discharges the materials into a bay or on to a conveyor.

In BHS’s application, a standalone NRT can detect and eject film or fibre to create a high-quality split between the materials. With the Nihot system integrated, it creates an even more pure fibre and film fraction. The combination allows operators to use their existing sorting process for 2D or 3D sorting because it is easy to retrofit.

Biffa (pictured) chose BHS as a partner to add a specialised eight tonnes an hour glass and container clean-up system to its existing MRF in Aldridge, West Midlands, greatly increasing the quality and recovery of glass, fibrer and clean containers.

Biffa divisional engineering manager Neil Arlett said the system, featuring a FiberPure optical sorter and Nihot air extraction system, paid for itself in just nine months. The NRT sorter removes an additional three tonnes an hour of fibre from the container line, increasing mixed paper recovery as well as the purity of containers, and reducing the amount of manual sorting needed.

Based on the results, Biffa has now ordered a FiberPure optical sorter in an upgrade of its Edmonton facility.

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