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[Chemical Knowledge]：The manufacturing method and process of recycled PP.

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The manufacturing method
of recycled PP
1. Introduction

With the rapid development of the plastics industry, polypropylene (PP) has become a widely used raw material for the production of chemicals. However, the treatment of PP waste has become increasingly prominent, which not only pollutes the environment, but also wastes resources. Therefore, it is of great economic and environmental significance to study the manufacturing method of recycled PP and improve the utilization rate of PP waste.

2. recycled PP manufacturing method

1. cleaning and classification

first, PP waste cleaning, remove the oil, dust and other impurities. Then, the scrap is classified according to the kind and color. The purpose of this step is to ensure the quality of the recycled PP and the consistency of the product.

2. Crushing and mixing

Crush the classified PP waste into small pieces, and then mix them evenly. This helps to improve the efficiency of the subsequent machining process.

3. Extrusion granulation

The mixed PP waste is heated and melted by an extruder to form PP in a molten state. Then, the molten PP was extruded into pellets through a die. This step is the key, it can ensure the physical and chemical properties of recycled PP.

4. Drying and Sieving

The extruded PP granules are dried to remove moisture therein. The particles are then sorted by size by sieving equipment. This helps to ensure that the quality of recycled PP is stable.

5. quality testing

on recycled PP quality testing, including physical properties, chemical properties and health performance. Ensure that recycled PP complies with relevant standards and regulations.
Precautions for
3.

1. During the manufacturing process, parameters such as temperature and pressure should be strictly controlled to ensure full melting and uniform mixing of PP waste.
2. Regular maintenance and maintenance of equipment to ensure the normal operation of equipment and product quality.
3. In the production process, safety operation procedures should be followed to ensure the personal safety of employees.

4. conclusion The manufacturing method of

recycled PP includes cleaning and classification, crushing and mixing, extrusion and granulation, drying and screening and quality testing. By strictly controlling the manufacturing process and parameters, high-quality recycled PP can be produced, the utilization rate of PP waste can be improved, environmental pollution can be reduced, and production costs can be reduced. Recycled PP has a wide range of applications and can be used to produce various plastic products, such as packaging bags, containers, pipes, etc.

5. Outlook

With the continuous progress and application of technology, the manufacturing method of recycled PP will be more perfect and optimized. In the future, we can further research and develop efficient and environmentally friendly recycled PP manufacturing technology, improve the performance and quality of recycled PP, and expand its application fields. At the same time, strengthen the recycling and recycling of recycled PP to promote the sustainable development of the plastics industry.

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