A rubber shredder/crusher is an industrial machine specifically designed to process waste rubber products (such as tires,PBR, SBR, hoses, shoe soles, and sealing strips). Its primary function is to break down large, tough, and elastic pieces of waste rubber into small fragments or rubber powder through shearing, tearing, or impact, thereby facilitating subsequent recycling (such as the production of recycled rubber, track surfacing, and oil refining).
Although the terms “shredder” and “crusher” are often used interchangeably, in professional contexts, they typically refer to two types of equipment with different operating principles, each suited for distinct processing stages:
1.Double shaft Rubber Shredder
Primary processing: breaking large pieces into smaller ones
Working principle: Typically features a dual-shaft shear design. Two shafts equipped with alloy blades rotate in opposite directions, utilizing the immense shear force generated by low speed and high torque to “shred” the rubber.
2. Single shaft Rubber Shredder
Working principle: The process of shredding rubber using a single-shaft shredder can be summarized as “low speed, high torque, and shear tearing.” It works by having a rotating cutter roller interact with stationary blades, gradually cutting and shredding the tough rubber material in a manner similar to cutting paper with scissors.
3.Rubber Crusher / Granulator
Fine Processing: Turning small pieces into granules or powder
Working Principle: Typically employs a single-shaft high-speed rotation or roller compression design. The rubber blocks are further crushed through the impact and grinding between high-speed rotating moving blades and stationary blades, or through the compression of two rollers.
| Process | Coarse | Secondary |
| Feeding size | Large (tire、big rubber plate) | small (after shredder) |
| Output size | Big (30-100mm) | small (1-10mm or smaller) |
| RPM/Torque | Low RPM / Ultra-high torque | High speed / Medium torque |
| Working principle | Shearing, tearing | Impact, grinding, compression |
Rubber possesses extremely high toughness, elasticity, and abrasion resistance, making it difficult for ordinary metal shredders to process:
1. High elasticity: When ordinary blades cut into rubber, the rubber deforms and springs back, preventing a clean cut. The blade design and engagement angle of specialized shredders allow them to “grip” the rubber.
2. Heat generation issues: Rubber has poor thermal conductivity, and high-speed friction can cause it to overheat, leading to melting and sticking to the blades. Specialized equipment prioritizes heat dissipation and speed control.
3. Contaminants: Waste tires contain steel wires, and rubber hoses contain fiber layers. The blades of specialized equipment are made of special alloys (such as H13 steel), which are wear-resistant and capable of cutting through steel wires without chipping.