WSM 500/700 – Granulator for secondary shredding of plastic

The cutting mill rotor is supported by robust spherical roller bearings housed in external steel bearing housings that are separated from the grinding chamber. This design prevents dust or ground material from escaping uncontrollably from the cutting chamber and affecting or damaging the bearing points.
In addition, both bearings are designed for easy maintenance: they can be easily relubricated and feature defined grease outlets, ensuring controlled lubrication and a long service life for the bearings.

Users can choose from a range of rotor variants to optimally adapt the cutting mill to the specific material and application. In all models, the rotor and stator blades are arranged at an angle to one another. This creates a defined, uniform cutting gap across the entire working width.
The shear-cutting principle not only ensures a consistent and reproducible product quality but also helps to reduce noise levels. The result is an efficient, gentle grinding process with high process stability.

To ensure reliable transmission of drive power to the rotor – even during continuous, long-term operation – the cutting mill is fitted with a reinforced flywheel. This ensures smooth operation, compensates for load peaks and stabilises the grinding process. As a result, even hard or tough materials can be processed efficiently without any loss of performance.

The upper grinding chamber and the feed hopper are designed to swivel or tilt backwards. This provides generous and convenient access to the lower grinding chamber section, including the rotor, rotor blades and the front and rear stator blades.
The screen is also easily accessible and can be quickly removed or replaced. This maintenance-friendly design reduces service requirements and downtime to a minimum and increases the machine’s availability during operation.

Cutter mills and granulators operate at high rotor speeds and, due to their design, generate higher noise emissions than slow-running single-shaft shredders. To effectively reduce noise levels, WEIMA offers various technical solutions.
These include, amongst other things, a specially developed soundproof hopper, which also minimises vibrations, as well as the rotor’s double-angle cutting technology, which ensures smoother operation. A particularly effective measure is full sound enclosure. A closed soundproof housing significantly reduces noise emissions.
The result is a noticeable reduction in stress for employees, an improved working environment and compliance with operational noise protection requirements.

Anyone looking for a versatile cutting mill will find the right solution at WEIMA. The machines are ideal for granulating pre-shredded materials such as pipes, automotive components, blow-moulded products (e.g. PET, PP or PE bottles), canisters, buckets, films and other flexible plastics.
Thanks to straightforward conversion, start-up lumps or thick-walled components can also be processed efficiently. Regardless of the input material, the result is a high-quality, uniform regranulate that reliably meets the quality requirements of modern recycling and production processes.

The screen mesh determines the particle size of the material after granulation. The rule is: the smaller the mesh diameter, the finer the resulting granules.
If the screen needs to be replaced for maintenance purposes or due to changing material requirements, this can be done easily and quickly thanks to an integrated quick-change mechanism. This ensures the machine remains versatile and minimises downtime.

WNZ and WSM machines are typically used as secondary shredders in two-stage shredding plants or recycling lines. The generously sized feed opening of the hopper – both in width and height – allows for convenient and efficient feeding of the machine.
An integrated slatted curtain reduces material spillage and serves as an effective splash guard. Material can be fed either manually or automatically via a conveyor belt.
For maintenance and servicing work, the entire hopper can be swung away using a tilting mechanism. An integrated safety limit switch ensures the necessary personal protection. Once opened, there is clear and convenient access to the rotor, which significantly reduces maintenance times.

A round extraction nozzle is integrated as standard on the side of the machine, allowing the produced granulate to be efficiently extracted and conveyed away. Alternatively, depending on the system design, a discharge solution using a screw conveyor can also be implemented to continuously remove the ground material from the machine.

The cutting geometry is the central component of a secondary shredder and is crucial for efficiency and the quality of the shredded material. To ensure that the cutting gap is always optimally adapted to the material being processed, the cutting blades can be precisely adjusted outside the machine using an adjustment gauge.
The stator blades are also reversible. Once the first cutting edge has worn down, the blade can simply be turned over to reveal a second cutting edge. This design significantly extends service life, reduces maintenance requirements and downtime, whilst simultaneously minimising the proportion of fine particles and dust generation. The result is a uniform, high-quality ground product with a defined particle size.