How to evaluate the performance of plastic crusher?

In the field of plastic recycling, plastic crusher is especially widely used, so do you know how to evaluate the performance of plastic crusher? Today I will give you a comprehensive analysis of how to evaluate the performance of the plastic crusher, factors affecting the performance of the plastic crusher, and how these factors affect the performance of the plastic crusher?

1. How to evaluate the performance of plastic crusher?

The performance of plastic crusher is mainly evaluated from the average size and size distribution of the pieces discharged from the crusher, the production efficiency and power consumption of the equipment, the noise of the equipment, the adaptability of the equipment to the kinds of broken materials and so on.

1.1 Average size and size distribution of fragments

The average size of fragments has a significant effect on their reprocessing properties (such as extrusion or injection), and too small or too large fragments have adverse effects on batching, feeding and plasticizing. Size distribution refers to the size difference of fragments. The wider the distribution is, the larger the size difference is. Obviously, too wide size distribution is not conducive to reprocessing.

1.2 Production efficiency and power consumption of equipment

Production efficiency refers to the ratio of the feed amount to the time taken for complete crushing. Power consumption refers to the power consumed by crushing waste plastics per unit mass. For any crusher, we always hope for high efficiency and low power consumption.

1.3 Equipment noise

Noise level is another important indicator of the crusher. Excessive noise seriously pollutes the production environment. Reducing noise has become an important task.

1.4 Crushed material

Among the broken materials, some are soft (such as PE, PP, SPVC), and some are rigid (such as HPVC, PS). Some have a large specific surface area (surface area per unit mass) (such as hollow pipes, profiled materials), Some have a small specific surface area (such as solid bars). Some are large pieces, some are small pieces, etc. These different types and properties of waste plastics make the crusher have versatility in structure and operation.

2. Factors affecting the performance of plastic crushers

The structure and operating conditions of the crusher, material properties are the main factors affecting the performance of the plastic crusher. Due to the disorder and complexity of the crushing process, it is difficult to accurately describe the structure of the equipment and the relationship between the operating conditions and its performance in theory. However, through the analysis of the experimental results, it is always possible to understand its working characteristics to a certain extent, in order to improve the structure and Operation provides reference basis.

3. How do crusher structure, operating conditions and material properties affect the performance of plastic crusher?

3.1 The structure of the crusher is mainly the gap between the moving and fixed blades.

The number of moving blades. The gap between the rotor and the chamber wall. The shape of the screen and the size of the screen hole. The gap between the rotating outline of the moving knife and the screen plate. Existing experimental research shows that:

3.1.1 For brittle materials, the gap between the fixed knife and the movable knife has little effect on its production efficiency, the average size and size distribution of the fragments, and the size of the discharged fragments is mainly determined by the size of the screen mesh. For soft materials, the size of the gap has little effect on the productivity and the average size distribution of the fragments, but it obviously affects the size of the fragments. The small gap results in a small fragment size.

3.1.2 The influence of the number of moving knives on its crushing performance is complex.If the specific surface area of the broken material is small or small volume fragments, regardless of soft or brittle materials, when the number of moving knives is large, the production efficiency can be maximized. When the specific surface area of the crushed material is large, for soft materials, the number of moving knives can increase the production efficiency, but for brittle materials, the situation is different. When the number of moving knives increases, the production efficiency will decrease instead.

3.1.3 The mesh size or the total mesh size has a significant effect on the production efficiency, but has little effect on the average size and size distribution of the discharged fragments.

3.1.4 The rotary outline of the moving knife and the clearance of the sieve plate did not significantly affect the productivity, but the shape of the sieve plate did, and the improved sieve plate can increase productivity by 50~70%.

3.1.5 Rotor speed obviously affects productivity, power consumption and noise. Experiments show that the rotor has several optimal operating points, where the productivity is the highest and the power consumption is the lowest. For waste plastics with small specific surface area or volume, increasing the rotational speed will improve the production efficiency, but may unduly reduce the average fragment size and widen the size distribution. For waste plastics with large specific surface area or volume, high rotational speed will lead to a decrease in production efficiency. Noise increases with the increase of speed, so reducing speed is an effective means to reduce noise.

3.2 The main operating conditions of crusher are rotor speed and feeding mode.

3.3 Material properties include toughness and brittleness, shape, size and surface area.

The above is part of my introduction to the performance evaluation of plastic crusher. If you have any questions or want to know more about plastic machinery, please contact me. My name is Luna, my email address is luna@lantaimachinery.com, WhatsApp/Wechat: + 86-13519648306.