Heavy-Duty D2/SKD11 Twin Shaft Claw Blades for Plastic, MSW & Wood Recycling

Claw count directly controls the blade's grabbing frequency and output particle size. 3-claw (3C) blades are designed for high-torque primary shredding of bulky stock—wooden pallets and large HDPE containers—where aggressive hook geometry provides maximum bite. 8-claw (8C) is the general-purpose standard for mixed MSW, plastic bales, and post-industrial scrap. 12-claw (12C) configurations produce finer output particles from lighter feedstocks such as rigid household plastics and packaging.

Standard broaching creates dimensional tolerances of ±0.1–0.2mm and introduces residual surface stress in the bore wall. Over millions of rotor cycles, this gap allows micro-rocking—progressive bore elongation that eventually destroys the rotor shaft. Precision Wire-EDM machines bores to ±0.01mm accuracy with a stress-free cut surface, eliminating the clearance that causes micro-rocking.

D2 (1.2379) is correct for post-consumer plastic bales with residual dirt and trace contamination. Upgrade to SKD11 when your feedstock includes glass-reinforced engineering plastics (PA66-GF30, ABS) mixed into contaminated streams. Select 42CrMo for timber or industrial scrap with high metal contamination risk—its higher impact energy absorption prevents brittle fracture on a metal strike.

On a 16-hour continuous line processing post-consumer HDPE and PP, schedule first indexing at 400–600 operating hours with D2, and 600–800 hours with SKD11 on clean feedstock. Contaminated or glass-filled streams reduce these intervals by 30–40%. Fixed tonnage-milestone indexing is recommended rather than waiting for visible edge rounding.

Yes. We manufacture matched stationary counter-knives and perforated sizing screens as a complete twin-shaft shredding tooling system. Supplying rotor blades and counter-knives from the same grinding run ensures consistent shear clearance across the full rotor-to-bed interface.