WNZ 310/800 secondary shredder for wood and plastic

two-stage treatment
The principle of the cutting mill
robust rotor bearings
low-maintenance rotor bearings
quick screen replacement
efficient material discharge

Granulators or cutting mills are typically used as secondary shredders within a multi-stage recycling plant. The material has already been pre-shredded. It now needs to be granulated to the desired final size. The rotor speeds are therefore correspondingly higher. A material feeder is not required. All machines are characterised by their heavy-duty steel construction, easy access for maintenance and high throughput rates. Among the most common applications are the secondary shredding of films, canisters, thin-walled pipes, profiles, bumpers, injection moulding waste or deep-drawn parts.

view inside weima wnz secondary shredder granulator

How WEIMA granulators work

Feeding the material into the hopper

Shredding between the rotor and the stationary stator blades (counter blades)

Determining particle size using a sieve

Discharge of the granulated material via suction or a screw conveyor

Feeding the material into the hopper

Shredding between the rotor and the stationary stator blades (counter blades)

Determining particle size using a sieve

Discharge of the granulated material via suction or a screw conveyor

Ideal for two-stage material processing

The high-speed shredders in the WNZ series operate on the cutting mill principle and are therefore ideally suited for two-stage processing in combination with a pre-shredder (e.g. WLK 1000). Virtually any type of plastic or wood can be further shredded. The multi-stage process proves to be particularly effective, quiet, energy-efficient and low-wear.

two weima shredders in orange for pool cover recycling

plastipack production hall with weima shredding system for pool cover scrap

open noise reduction box of weima wnz granulator

At Plastipack Limited, a WEIMA ZM shredder and a WNZ granulator are used to shred swimming pool covers for in-house recycling

About the customer's story

Robust, low-maintenance rotor bearings designed for use in shredders

The spherical roller bearings used to support the cutter rotor are housed in external steel bearing housings that are separated from the grinding chamber. This has the advantage that no dust or material can escape unchecked into the grinding or cutting chamber and damage the bearings. Both bearings are also easy to relubricate and are fitted with grease nipples.

Suitable for a wide range of plastic applications

If you are looking for a flexible granulator solution, WEIMA has what you need. With our machines, you can granulate pre-shredded materials such as pipes, automotive parts, blow-moulded products like PET bottles, PP/PE bottles, canisters, buckets, films and other flexible materials. With a simple changeover, even start-up lumps or other thick-walled materials can be shredded. In all cases, you will obtain a high-quality, homogeneous regranulate that meets the high standards of a modern recycling plant.

Easy to fill and maintain

via a large, tilting feed hopper

WNZ machines typically serve as secondary shredders in a two-stage shredding plant or recycling line. The feed hopper’s particularly wide and tall opening makes it easy to load the machine. A slatted curtain acts as a splash guard. Material can be fed manually or automatically via a conveyor belt. For maintenance purposes, the entire hopper can be tilted away using a tilting mechanism with a safety limit switch, providing unobstructed access to the rotor.

Easy to fill and maintain

Quick screen replacement during maintenance or when changing materials

The screen mesh determines the particle size after granulation. The smaller the mesh size, the finer the ground material becomes. If a screen needs to be removed for maintenance purposes or when switching between different material flows, this can be done easily using a screen-changing mechanism.

Efficient material discharge via a vacuum extraction system or screw conveyor

A round extraction port is fitted as standard on the side of the machine, through which the granulated material can be extracted. If required, a screw conveyor system can also be installed for material removal.