Cleaner cuts and longer service life with stator knives and flat knives

Optimised cutting performance for recycling and shredding systems

Metav supplies high-quality stator knives and complementary flat knives for a wide range of industrial shredders and cutting mills. The two product groups are treated as distinct components: stator knives (also known as stator blades or bed knives) form the fixed cutting partner inside the milling chamber, while flat knives (also called flat blades or shear blades) serve as the rotor-facing cutting edges in many setups.

How these blades work in practice and where they belong

Combined in the milling chamber, stator knives and flat knives perform the primary size reduction of production waste in plastic recycling. The stator knife is mounted stationary; the rotor blade passes against it, producing the shearing action that achieves shredding and fine milling. Cutting gap adjustment between the two blades controls final particle size and is selected according to the input material. While rotor knives often have a shallow cutting angle, stator knives typically feature a steeper profile; both can be adapted through different tool materials and cutting geometries to match process requirements.

Tangible production advantages that reduce downtime and improve yield

• consistent compatibility with major machine manufacturers such as Herbold, Alpine, Hosokawa, STF, Condux, Eldan, Neue Herbold, Amis Zerma, Getecha, Wanner and Previero
• adjustable cutting gap for optimised particle size and reduced rework
• adaptable cutting geometry (steeper stator profile or flattened angles) to balance aggressiveness and edge stability
• material-specific selection and bevel options to extend edge life and improve cutting reliability
• easy integration as a direct replacement for existing stator or flat knife assemblies

Metav as the practical partner for workshop and plant managers

Choose Metav for a pragmatic combination of technical expertise and robust logistics. Metav acts as a quality filter for the European market from its Emmerich base, offering a wide assortment and experienced selection advice. Other machine brands appear as industry context, but Metav’s range and service model focus on delivering the right stator knives and flat knives for your specific shredder model and processing goals.

In short: precision where it matters

Stator knives and flat knives from Metav deliver controlled shearing action, adaptable cutting geometry and broad machine compatibility — all aimed at improving throughput and part consistency in plastic recycling.

technical data (concise)

• mounted in the milling chamber; fixed blade opposite rotor knife
• function: shredding and fine milling of production waste (plastic)
• cutting gap: adjustable depending on input material
• cutting geometry: stator typically steeper; rotor typically flatter
• optimisation options: varied tool materials and bevel/edge geometries
• compatible with: Herbold, Alpine, Hosokawa, STF, Condux, Eldan, Neue Herbold, Amis Zerma, Getecha, Wanner, Previero, and other major brands

FAQ

What is the functional difference between stator knives and flat knives?
Stator knives are the fixed cutting partner inside the milling chamber; flat knives act as the moving or rotor-facing edges that shear against the stator knives to reduce material size.

Which machines are compatible with these stator knives and flat knives?
Metav supplies stator knives and flat knives suitable for models from Herbold, Alpine, Hosokawa, STF, Condux, Eldan, Neue Herbold, Amis Zerma, Getecha, Wanner, Previero and many other recognised manufacturers.

How does cutting gap adjustment affect processing?
Changing the cutting gap between stator knives and flat knives alters final particle size and cutting behaviour; a narrower gap increases fineness, while a wider gap reduces aggressiveness and can extend edge life.

When should cutting angles or bevels be changed?
If a more aggressive cut is required, flattening the cutting angle on the rotor or flat knife increases aggressiveness. For a more durable edge under heavy loads, a knife with a bevel or stabilising pre-bevel offers greater edge stability.

Can the blades be adapted for different plastic inputs?
Yes — both stator knives and flat knives can be supplied in different tool materials and cutting geometries to match specific plastic waste types and processing conditions.