The Model 800 twin-shaft shredder is an industrial machine designed for coarse crushing and volume reduction of scrap metal. It adopts two counter-rotating shafts to shear, tear and compress scrap materials. It is suitable for pre-treatment of scrap aluminium, scrap steel, scrap iron and other metal scraps, providing a suitable feed size for subsequent sorting, crushing and recycling processes.

This Model 800 twin-shaft shredder, custom-built for a client in India, is currently undergoing trial runs. The test materials include scrap aluminium, scrap steel and scrap iron. These tests are used to verify the equipment’s operational stability and shredding performance under varying conditions of scrap metal.

Unlike high-speed shredding equipment, the twin-shaft shredder is characterized by low-speed, high-torque shearing. The blades on the two cutting shafts work in concert to progressively shred the scrap metal fed into the machine. For scrap metal that is large in size, irregular in shape, or varies in thickness, this operating method reduces the load on the equipment compared with relying solely on high-speed impact.

The “800" in Model 800 typically relates to the equipment specifications and the size grade of the cutting shafts. The actual processing capacity cannot be determined solely by the model number. The material composition, dimensions, thickness, impurity content of the scrap metal, as well as the final output requirements, all influence the machine’s actual throughput. Consequently, when selecting equipment, it is insufficient to consider only the “tonnes per hour" rating; testing must also be conducted in conjunction with the specific material.

Why does scrap metal require a customized twin-shaft shredder? Although scrap aluminium, scrap steel and scrap iron all fall under the category of scrap metal, there are significant differences in their hardness, density, shape and processing difficulty. For example, lightweight aluminium and heavy steel are subjected to different forces once inside the machine, necessitating corresponding adjustments to blade material, cutting tool structure, motor power and the configuration of the reduction system.

Consequently, metal scrap shredding equipment typically needs to be configured according to the following parameters: material type, such as scrap aluminium, scrap steel, scrap iron or mixed metals; feed size, which affects hopper dimensions and shredding chamber design; processing capacity, which determines the power system and overall equipment specifications; output size, which affects blade clearance and the selection of downstream crushing equipment; and material condition, including loose scrap, bales, and metal parts of various shapes.

For recycling enterprises requiring the continuous processing of large volumes of scrap metal, twin-shaft shredders are typically used as front-end primary shredding equipment. After shredding, the material size is more uniform, facilitating its entry into subsequent processes such as magnetic separation, eddy current separation, or secondary crushing.

This Model 800 twin-shaft shredder is currently undergoing a practical trial run at the client’s premises prior to dispatch. The focus of the testing is not merely to observe whether the equipment can “shred" metal, but to comprehensively assess feed stability, blade shaft operation, power load, and the condition of the output under different material conditions.

Such trial runs are particularly important for customized equipment. By conducting tests using the client’s actual scrap, it is possible to identify in advance whether the material size, blade configuration and power parameters are compatible, and to further adjust the equipment based on the test results.

For enterprises planning to establish a scrap metal recycling production line, it is recommended that they provide samples of the actual material, the maximum feed size, the target processing capacity, and the requirements for subsequent processes before purchasing a twin-shaft shredder. Rather than simply selecting equipment based on model number, configuring the machine based on material testing is more conducive to determining the appropriate equipment specifications.