Improving the purity of Recycled PE particles is a crucial task, which directly affects the quality and application scope of recycled materials. The following is a discussion on how to improve the purity of Recycled PE particles from different aspects.
1. Strengthen the screening of raw materials
In the initial stage of recycling waste PE materials, careful and strict screening should be carried out. First, classify waste PE products from different sources, such as plastic bottles, films, pipes, etc. Because different products may be added with different additives or polluted to different degrees during use, classification can effectively reduce the mixing of impurities. At the same time, arrange professionals to manually sort the recycled materials to remove obvious foreign matter, such as metal, glass, sand and stone. For some impurities that are difficult to identify with the naked eye, advanced detection equipment, such as X-ray detectors, can be used to ensure the purity of raw materials. In addition, a complete recycling channel management system can be established, and cooperation with reliable suppliers can be carried out to control the quality of raw materials from the source.
2. Optimize the cleaning process
Cleaning is one of the key links to improve the purity of Recycled PE particles. The use of a multi-stage cleaning system combined with different cleaning methods can achieve better cleaning effects. For example, soaking cleaning is first performed to fully soak the waste PE material in water to loosen the dust and dirt on the surface. Then spray cleaning is performed to impact the surface of the material with high-pressure water flow to remove residual stains. At the same time, add an appropriate amount of detergent or environmentally friendly solvent to enhance the cleaning effect. During the cleaning process, the cleaning temperature and time should be controlled. Properly increasing the temperature can enhance the activity of the detergent, but too high a temperature may cause the PE material to deform or degrade. Reasonable extension of the cleaning time can ensure that impurities are fully removed, but production efficiency should also be considered. In addition, ultrasonic cleaning technology can also be introduced to use the cavitation effect of ultrasonic waves to make tiny bubbles produce strong impact and vibration in the liquid, thereby effectively removing impurities on the surface and inside of the material.
3. Application of advanced separation technology
In order to further improve the purity of Recycled PE particles, advanced separation technology is needed. Density separation is a commonly used method that uses the density difference of different materials to separate PE from other materials with different densities by sinking and floating. For example, when waste PE materials are placed in a solution of a specific density, PE particles will float on the surface of the solution, while impurities with higher density will sink. Electrostatic separation technology separates PE from conductive materials such as metals based on the difference in conductivity of different materials. Under the action of the electrostatic field, conductive materials will be adsorbed onto the electrode, while PE particles will not be affected. In addition, color sorting separation technology can be used to separate Recycled PE particles with impure colors. The color sorter identifies particles of different colors and separates them using airflow or mechanical devices, thereby improving the color purity of the particles.
4. Strengthening production process control
In the production process of Recycled PE particles, each link must be strictly controlled to ensure a stable improvement in purity. Keep the production workshop clean and reduce the mixing of dust and other pollutants. Use closed production equipment to prevent external impurities from entering the production process. Establish a strict quality inspection system and regularly perform performance tests and impurity content analysis on Recycled PE particles. For example, detect performance indicators such as melting point, density, tensile strength, and use spectral analysis and other technologies to detect impurity components. Once a problem is found, timely measures will be taken to make adjustments. At the same time, the training of production personnel will be strengthened to improve their professional quality and quality awareness, and production will be carried out strictly in accordance with the operating procedures to ensure that each link can effectively improve the purity of the particles.
