Industrial Plastic Crusher & Granulator Knives for PET, PVC & PP Recycling
Granulator Blades
D2, SKD-11, and Cr12MoV granulator rotor and stator knives precision-ground to ±0.02mm bolt-hole tolerance for Cumberland, Conair/Wortex, Herbold, Pallmann, and Rapid unit granulators. Bevel angles from 30° to 55° are matched to polymer type—delivering clean, low-fines regrind for closed-loop recycling of PET bottles, PVC pipes, and injection-moulding runners. Vacuum hardening plus deep cryogenic processing stabilizes HRC 58–62 for extended edge retention between sharpening cycles. Custom rotor profiles available to drawing within 10 working days.
- ■Material: D2, SKD-11, DC53,Cr12MoV
- ■Application: PET, PVC & PP Recycling, Heavy-Duty Scraps
■ ISO 9001:2015 Certified
■ In-House Heat Treatment
■ Strict Dimensional Tolerances
■ Global Door-to-Door Delivery
[ Engineering Reference ]
Decisive Specifications
| Material | D2, SKD-11, DC53,Cr12MoV |
|---|---|
| Hardness | 58 - 62 HRC |
| Bolt-hole Tolerance | ±0.02 mm |
| Flatness | 0.05 mm |
| Parallelism | 0.03 mm |
| Bevel Angle | 30° - 55° (Customizable) |
| Heat Treatment | Vacuum Hardening + Cryogenic Processing |
| Application | PET, PVC & PP Recycling, Heavy-Duty Scraps |
| Match Machines | Cumberland, Amacoil, Alpine, Conair/Wortex, Ganutec, Foremost, Nelmor, Mitts & Merrill, Rapid, Hydreclaim, Herbold, Pallman, Dreher, Buss-Condux, IMS, Ramco (R&M), Entoletor and many others |
■ All values verified via CMM inspection · ISO 9001:2015
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Need a Specific Size or OEM Replacement?
Don't see your exact specs? Send us a blueprint, a worn sample, or just your machine model. Our team will review the details and provide a tailored quotation.
[ Standard Reference ]
Common Standard Dimensions
| Specification | Dimension (L × W × T) | Pitch |
|---|---|---|
| Double hole | 90 × 70 × 8 | 40 / 45 / 50 |
| Double hole | 120 × 70 × 8 | 60 |
| Triple hole | 126 × 60 × 8 | 40 |
| Triple hole | 150 × 70 × 8 | 50 / 55 |
| Triple hole | 170 × 70 × 8 | 45 |
| Triple hole | 180 × 70 × 8 | 60 |
| Quadra hole | 170 × 70 × 8 | 40 |
| Quadra hole | 200 × 70 × 8 | 50 |
[ Technical Audit ]
Engineering Advantages
Maximized Regrind Quality
Ultra-sharp, precisely aligned cutting edges shear plastic cleanly rather than tearing it, drastically reducing the generation of unwanted dust and fines.
Extended MTBR (Mean Time Between Replacements)
High wear resistance minimizes the frequency of blade sharpening and replacement, keeping your recycling line running continuously.
Reduced Motor Load
Optimized cutting angles decrease the shearing force required, lowering the electrical amp draw on your granulator's motor and reducing energy costs per ton.
[ System Inventory ]
Related Blade Categories
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[ Knowledge Base ]
Product FAQs & Buying Guidance
Technical FAQs
01How do I choose between D2, DC53, and Cr12MoV for my granulator?+−
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.
02What causes excessive dust and fines during plastic granulation?+−
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.
03Can you match the exact bolt-hole patterns for my specific machine?+−
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.
04What rotor knife geometry produces the lowest fines fraction in beside-the-press granulators?+−
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.
05When should I sharpen versus replace my granulator rotor knives?+−
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.
Why Choose Sureay
01Are you a trading company or a direct manufacturer?+−
We are a 100% direct OEM manufacturer established in 2008. When you buy from Sureay, you bypass middleman markups and communicate directly with the engineers who forge and grind your blades.
02What makes Sureay's heat treatment different from cheaper alternatives?+−
Unlike standard quenching, every Sureay blade undergoes deep cryogenic treatment after vacuum hardening. This transforms retained austenite into martensite, boosting wear resistance by up to 40% and ensuring uniform hardness across the entire cutting edge.
03Do you ship globally and how long does it take?+−
Yes, we export to over 50 countries. Standard OEM replacement blades typically ship within 48 hours. Custom profiles take 10–15 working days. We partner directly with DHL, FedEx, and international sea freight forwarders for reliable door-to-door delivery.
04What quality certifications does Sureay hold, and can you provide material test reports?+−
Sureay is ISO 9001:2015 certified. Every shipment includes a Rockwell HRC hardness test report, a dimensional inspection record, and a heat treatment batch certificate. For OEM qualification, full CMM dimensional reports and steel mill certificates are available on request.
05Can we trial a sample set before committing to a full production order?+−
Yes. We offer sample sets (typically 2–5 blades) for machine fit verification and edge life testing. Standard sample lead time is 5–7 working days. For custom profiles, dimensional sign-off samples are produced before full production commences — no tooling commitment until fit is confirmed.
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