Blick in den Schneidraum auf den WEIMA V-Rotor

Rotor and cutting technology

No two applications are the same. But one thing remains the same: The rotor is the heart of a shredder. It is fitted with cutting blades and rotates between 30 and 400 revolutions per minute, depending on the material and machine. The optimum coordination of rotor, knives and counter knives is decisive for the shredding result.

Rotor variants

Innovative rotor technologies for optimum shredding results
a WEIMA V Rotor grey
A V-Rotor with details
A drawing from the V rotor
V-rotor
WEIMA's innovative V-rotor with SuperCut cutting gap adjustment ensures the optimum cutting geometry that adapts precisely to the material requirements. The result: more homogeneous shredding results, universal applicability, high throughput rates, lower energy consumption, resistance to foreign matter and low wear.
P-Rotor in grey with some details
F rotor for veneer, big bags, fibers, ropes, strings
a drwaing from a cutting gap
F-rotor
The F-Rotor optimally shreds flexible materials such as filaments, tapes, ropes, cords, veneers and films. Thanks to the special blade pitch and cutting geometry, wrapping of the materials is prevented, which could otherwise lead to melting and blockages due to friction. The blades engage fully with the counter blade and, together with a narrow cutting gap, ensure a controlled feed and fast, efficient shredding.
A Fine cut Rotor in grey
FineCut Rotor
The FineCut rotor was specially developed for fine shredding applications. It is used in the shredders of the FineCut series and is ideal for shredding materials to a small and uniform particle size, which is required for downstream recycling processes.
To the FineCut shredders
PreCut Rotor
The PreCut rotor is specially designed for the pre-shredding of large and bulky materials. It is used in the PreCut shredders, which are ideal for the first stage of a shredding process before the material is further processed in finer steps. The rotor is extremely durable and robust to withstand the demands.
More about PreCut Shredde
PowerLine Rotor
The PowerLine rotor is a versatile and powerful rotor that has been specially developed for the demanding shredding of a wide range of materials. The rotor is used in the PowerLine series, which is particularly suitable for industrial applications where a robust and flexible solution is required.
The PowerLine machines
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While the rotor cutting blades rotate, the counter blades in a shredder are firmly screwed into the base of the cutting chamber. Many variants are reversible. The cutting gap can be variably adjusted as an option. This is ideal if readjustment is required due to wear. This keeps the throughput consistently high. The choice of the right type of counter blade always depends on the material and the desired shredding result.

Expert tip
For particularly abrasive materials, we recommend Vautid wear protection.

Learn more about wear protection

WEIMA cutting knives in OEM quality

Cutting blades are available in many different sizes and shapes. Blade carriers are either welded or bolted onto the rotor. Particularly important: the exact adjustment of the cutting gap between the cutting blade and the counter blade. This is where the actual shredding takes place.
Rotor knife
Smooth cutting blade
Smooth cutting blades are extremely resistant to breakage from impurities and are characterized by a long service life, even with aggressive materials. Ideal for breakable applications such as chipboard and can also be used in a mixed configuration.
Rotor knife
Cutting blade concave
Concave cutting blades are used as standard in single-shaft shredders and universal shredders. The particularly good material feed results in a significantly lower power requirement when shredding materials such as wood and hard plastics.
Rotor knife
Extra concave cutting blade
The use of extra-concave cutting blades significantly improves the material feed, which further optimizes the cutting performance and prevents the material from simply being crushed. Typical example applications are filaments and films.
Rotor knife
Carbide cutting blade
Minimal maintenance: The use of carbide cutting blades ensures maximum service life. This blade variant is available both as a solid carbide version and with brazed carbide plates; the carbide itself can be selected variably. Typical applications include abrasive materials such as fiberglass and sand-contaminated agricultural film.
Rotor knife
Cutting knife trapezoid
WEIMA trapezoidal cutting knives offer maximum resistance to impurities. Thanks to the stable cutting edge and consistently good cut, lump formation is avoided. The flat cut is particularly advantageous for films in order to obtain output material that is as disintegrated as possible.
Rotor knife
CrossCut cutting blade
The innovative CrossCut knives offer numerous advantages: Significantly reduced energy requirements, quiet and gentle rotor running behaviour and a higher material throughput. They also result in evenly shredded material with fewer fines and longer blade life.
Rotor knife
FineCut knife
WEIMA FineCut knives are only used in FineCut secondary shredders. They enable particularly precise and uniform shredding to small particle sizes. Their special cutting geometry enables a precise cut, which increases the efficiency of the shredding process. The fine shredding also contributes to lower energy consumption and ensures optimum results in downstream processes.
To the FineCut machine
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Adjustable counter knives

The cutting gap between the rotor and stator knives can be variably adjusted using adjustable counter knives. If the wear on the counter blade increases due to the increased cutting gap, it is readjusted – and the wear is reduced immediately. In addition, the flexible adjustment of the counter blade further improves the cutting result and therefore the throughput of the machine. This ensures greatly reduced sensitivity to impurities. Another plus: The counter knives can be reversed, which significantly reduces spare parts costs.

Broaching knife

A special feature of WEIMA machines is that the broaching blade is positioned very close to the rotor seal so that the material is cut right to the very end of the rotor. This means that no non-shredded material is left behind that could get into the rotor bearings through the seal and cause damage.

gray WEIMA V-rotor with cutting blades, in front the counter blade

Broaching blade (external) on a V-rotor

Two WEIMA employees look at shredded material in a container
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