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With the rapid development of the plastic industry, polypropylene (PP) has become a widely used raw material for chemical production. However, the issue of PP waste treatment is becoming increasingly prominent, causing pollution to the environment and wasting resources. Therefore, studying the manufacturing methods of recycled PP and improving the utilization rate of PP waste has important economic and environmental significance

2、 The manufacturing method of recycled PP 

1 Cleaning and Sorting 

First, clean the PP waste to remove oil, dust, and other impurities. Then, classify the waste according to its type and color. The purpose of this step is to ensure the quality of recycled PP and the consistency of the product

2. Crushing and Mixing 

Crush the sorted PP waste into small pieces and mix evenly. This helps to improve the efficiency of subsequent processing

3. Extrusion granulation 

Melt the mixed PP waste through an extruder to form a molten state of PP. Then, the molten PP is extruded into granules through a mold. This step is crucial as it ensures the physical and chemical properties of regenerated PP

4. Drying and sieving 

Dry the extruded PP particles to remove any moisture. Then, the particles are classified according to their size through screening equipment. This helps to ensure the stable quality of recycled PP

5. Quality testing: Conduct quality testing on recycled PP, including physical, chemical, and hygiene properties. Ensure that recycled PP meets relevant standards and regulations

3、 Notes 

1 During the manufacturing process, temperature and pressure parameters should be strictly controlled to ensure sufficient melting and uniform mixing of PP waste

2. Regularly maintain and upkeep the equipment to ensure its normal operation and product quality

During the production process, safety operating procedures should be followed to ensure the personal safety of employees

4、 Conclusion: The manufacturing method of regenerated PP includes steps such as cleaning and classification, crushing and mixing, extrusion granulation, drying and screening, and quality testing. By strictly controlling the manufacturing process and parameters, high-quality recycled PP can be produced, improving the utilization rate of PP waste, reducing environmental pollution, and reducing production costs. Recycled PP has a wide range of applications and can be used to produce various plastic products, such as packaging bags, containers, pipelines, etc

5、 With the continuous progress and application of technology, the manufacturing methods of recycled PP will be more perfect and optimized. In the future, we can further research and develop efficient and environmentally friendly manufacturing technologies for recycled PP, improve the performance and quality of recycled PP, and expand its application areas. At the same time, strengthening the recycling and reuse of recycled PP promotes the sustainable development of the plastic industry.