In this article we will discuss the process of choosing a shredder. The aim is to facilitate the process of deciding which shredder is the most suitable for our requirements.
Before we move on, I'll look at the following questions:
We now have the basic information necessary to make our decision. Shredders are divided into "pre-shredders" and "shredders".
This is slow-running shredding. They can process heavy, hard and large blocks of input raw material. The size of the input raw material ranges from 600mm x 1000mm x (height - "unlimited"). These dimensions are derived from our pre-shredders. With such a pre-shredder it is possible to shred, for example: Thick-walled sinters, plastic "cakes", jerrycans, thick-walled pipes, large-scale mouldings, pallets..... For some technological processes, the output fraction is not small enough and therefore it is necessary to grind the raw material in knife mills.
If the input raw material is a large block, it is advisable to equip the pre-shredder with a sliding hopper. Its great benefit is that it can "cut" material from large blocks of input material.
If it is necessary to shred large pieces with a small volume such as: tanks, fenders, bumpers, large spools, pallets, etc., we recommend equipping the pre-shredder with an upper pressure. This significantly increases the shredding speed.
Most such pre-shredders have a controlled drive. First of all, this ensures engine protection. And secondly, it contributes to increasing the efficiency of shredding. Voltage, current and cos phi are measured on the engine. Based on this, the engine load can be evaluated and the hopper feed mode is automatically selected according to the set shredding characteristics. The characteristics can be adjusted on the control panel.
They are suitable for thin-walled and less demanding raw materials. The input material determines the type and size of the shredder. The shredders can have knives perpendicular to each other or inclined to each other. The advantage of knife shredders is high aggressive geometry of the rotor, which provides a large space in front of the rotary knife. This feature results in the material not bouncing off the rotor and being pulled into the cut.
If the shredder has knives perpendicular to each other, it is easier to manufacture the machine, but the shredding operation itself is dynamically demanding. The inclined knives ensure smooth shredding operation, better energy balance, less heating of the material and formation of less dust particles, higher shredding efficiency.
In many cases, the shape and size of the input hopper are addressed depending on the dimensions of the input raw material. The size of the shredded raw material is regulated in most shredders by the size of the screen holes. The size and location of the screen determines the shredding performance.
The distance between the rotary knives and the screen depending on the crushed material is a parameter that significantly affects the crushing performance.
It is advantageous to use extraction in the knife shredders, which ensures a homogeneous size of the crushed material, increases the shredding performance, removes the proportion of dust particles. It should be noted that the correct extraction design is affected by:
The correct choice of shredder depends on several parameters. At the same time, we must also take into account the minimum price costs for the implementation of the entire system, using high-quality components that guarantee long-term use.
For shredding lines, it is important to optimize the shredding performance of the pre-shredder and the shredder so that the entire system operates at optimal load with minimum energy consumption and maximum shredding efficiency.
Based on 25 years of experience in the design and manufacture of shredding machines and lines, we will be happy to help you design the optimum system.
PROFING shredders are characterised by:
The set of these parameters ranks these machines among the world leaders in their category. Thanks to our portfolio of machines we have become suppliers, of small companies as well as large automotive concerns across the European market and to a lesser extent, we have also exported our machines outside the EU.