Standard beside-the-press granulators cannot swallow large blow-molded parts, bins, drums, pallets and thick purges. That is exactly the job of a heavy-duty plastic crusher with an oversized feeding mouth, a reinforced rotor and high cutting torque. This buyer-focused guide explains what actually distinguishes a capable large-hollow-part crusher from an undersized “heavy-duty” label: feed opening and chamber design, rotor and knife configuration, customizable knife steel (SKD-11 / 9CrSi), motor sizing, safety and maintenance access, and the total cost of ownership. It is written for injection molding plants, blow molding factories, packaging producers and plastic recyclers evaluating a bulky-waste granulator from a Chinese factory-direct supplier.