Granulator Blades & Crusher Knives

D2 is the industry standard for clean plastics like PET and PP. For glass-filled or abrasive polymers, DC53 offers superior wear resistance. If your feed contains occasional metal impurities (like wire or staples), Cr12MoV provides higher impact toughness to prevent edge chipping.

It's usually caused by blunt edges or an incorrect bevel angle tearing the plastic instead of shearing it. We optimize the bevel angle (30°–55°) based on your specific polymer to ensure clean cutting, which maximizes your regrind quality and pellet value.

Absolutely. We maintain a vast database of OEM blueprints for Cumberland, Herbold, Rapid, Weima, and more. We CNC-mill all counter-bores to a strict ±0.02mm tolerance to guarantee a perfect drop-in fit without micro-rocking.

For beside-the-press in-line granulators on injection moulding lines, a 40°–45° bevel angle with a polished rake face (Ra ≤ 0.8μm) delivers the cleanest, lowest-fines regrind on runner and sprue material. The polished face reduces adhesion in the cutting zone, preventing the micro-welding of HDPE and PP material that generates fines at the high cycle rates typical of continuous injection moulding production.

The primary indicator is regrind particle size distribution - when the oversize fraction exceeds 8–10% of output weight, rotor knives need sharpening. Secondary indicators are a 15%+ increase in motor amp draw above baseline and elevated dust fraction. Each Sureay blade can typically be resharpened 3–5 times before the bevel geometry reaches minimum usable material depth, at which point replacement is more economical.