Precise pellet cutting for consistent granulate quality

Precision cutting for recycling: granulator knives that keep production moving

Granulator knives, also known as pelletiser knives or hot cut-off knives, are the cutting element in recycling and compounding lines that convert extruded strands into uniform pellets. Available as spatula-shaped blades, scrapers, circular knives and agglomerator knives, these components determine pellet size, production stability and downstream processability.

How granulator knives work in industrial extrusion

Granulator knives are mounted on a rotating cutter disc inside pelletising units or extruders, including twin-screw extruders. As the viscous polymer strand is extruded through the die, the rotating knife severs the strand into pellets. The pelletising process often uses hot water to prevent sticking during cut-off; this is why some types are described as hot cut-off knives. Material choice and blade geometry control wear behaviour, cutting angle and edge life.

Measurable production benefits you can expect

• Improved pellet uniformity and consistent grain size, supporting downstream processing
• Reduced downtime through optimised edge geometry and material selection
• Enhanced throughput thanks to reliable cutting performance at process speeds
• Lower scrap rates by preventing strand deformation and sticking during pelletising
• Flexible application across recycling, compounding and agglomeration tasks

Why choose Metav as your granulator knife partner

Metav positions itself as a pragmatic precision partner for industry and workshops. Based in Emmerich, Metav combines a broad assortment with quality control and supply reliability: over 48,000 customers trust their range, and more than 250,000 products simplify procurement for production teams. For buyers seeking recycling spare parts, Metav offers a curated selection of granulator knives, replacement scrapers and circular blades, with a focus on material suitability and consistent performance. If you need guidance selecting blade geometry or material, Metav’s specialists provide technical advice to match knives to your extruder and process parameters.

Technical data (at a glance)

• product variants: granulator knives, pelletiser knives, scraper blades, circular knives, agglomerator knives
• typical shape: spatula-shaped (spatula knives)
• typical application: pelletising in extruders, twin-screw extruders, recycling granulators
• process aid: hot water pelletising (prevents sticking)
• alternative names: pelletiser knives, hot cut-off knives, spatula knives
• production focus: materials and coatings selected to meet wear and cutting demands

FAQ

What types of granulator knives are available and how do they differ?
Granulator knives are available as spatula-shaped pelletiser knives, scraper blades, circular knives and agglomerator knives. Each type differs in mounting, edge geometry and intended application; spatula-shaped knives are common for strand pelletising, while circular knives suit certain cutter disc arrangements.

How do granulator knives influence pellet quality?
Blade geometry, edge sharpness and material determine the cut action. Properly matched granulator knives ensure consistent pellet length, reduce fines and prevent strand deformation, which supports downstream handling and quality.

Which blade materials and coatings are used for recycling applications?
Materials and coatings are chosen to balance wear resistance and toughness for the processed polymer. Metav’s range includes knives manufactured from appropriate tool steels and treated with coatings where required to extend service life in abrasive or high-temperature environments.

Can I use the same granulator knife across different extruder types?
Compatibility depends on cutter disc design, knife holder dimensions and operating speed. Select granulator knives that match your cutter system and process parameters; Metav’s product descriptions and specialists help identify suitable options.

What process changes reduce knife wear during pelletising?
Optimising cutter speed, maintaining correct hot water flow to prevent sticking, and choosing the right blade material and edge geometry all reduce wear and extend service intervals for granulator knives.

In summary, granulator knives (pelletiser knives and related blade types) are key to reliable pellet production in recycling and compounding. Choosing the right knife geometry and material delivers measurable gains in throughput, pellet uniformity and operational uptime.