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[Chemical Knowledge]：Production and manufacturing method and process flow of recycled PET

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The manufacturing method
of recycled PET
1. Introduction

With the continuous improvement of environmental awareness, the utilization of renewable resources has gradually become an important development trend in the chemical industry. As an important raw material for chemical production, the manufacturing method of recycled PET has attracted much attention. This article will introduce the manufacturing method of recycled PET in detail, including the key steps of raw material selection, pretreatment, melt granulation and so on.

2. raw material selection

The main raw material for recycled PET is waste PET plastic bottles. Choosing high-quality waste PET plastic bottles is very important for the quality of recycled PET. Waste PET plastic bottles with no pollution, no impurities and uniform color should be selected.

3. pretreatment

pretreatment is to convert waste PET plastic bottles into fragments suitable for recycling processing. The pre-treatment steps include washing, crushing and drying.

1. Cleaning: Clean the waste PET plastic bottles and remove the labels and other attachments. Can use water and detergent for cleaning.
2. Crushing: The cleaned waste PET plastic bottles are crushed to become small pieces or fragments to facilitate the subsequent melting granulation process.
3. Drying: The crushed pieces are dried to remove the moisture therein.

4. melt granulation

melt granulation is a key step in the manufacturing process of recycled PET, including melting, filtering, and pelletizing.

1. Melting: Add the pretreated fragments to a high-temperature melting machine and heat them to a certain temperature to melt the fragments into PET melt.
2. Filtration: During the melting process, a certain filter agent needs to be added to remove impurities and uneven colors in the melt.
3. Pelletizing: The filtered melt is cooled and hardened to form cylindrical particles of a certain length, that is, recycled PET particles.

5. post-treatment

post-treatment is to further improve the quality and purity of the recycled PET pellets. The post-treatment steps include washing, drying and sieving of the particles.

1. Particle cleaning: The recycled PET particles are cleaned to remove impurities and residues.
2. Drying: The washed particles are dried to remove the water.
3. Screening: The dried particles are screened and classified according to different particle size specifications to meet different production needs.

6. Precautions

In the manufacturing process of recycled PET, the following matters need to be paid attention to:

1. Control various process parameters to ensure stable product quality;
2. Regularly check the operation of production equipment to ensure the normal operation of equipment;
3. Strengthen safety management in the production process to prevent accidents.

7. conclusion

recycled PET is an important raw material for chemical production, and its manufacturing method includes raw material selection, pretreatment, melting granulation and post-treatment. In the actual production process, it is necessary to pay attention to the control of process parameters, equipment maintenance and safety management to ensure product quality and production safety. With the continuous improvement of environmental awareness and the increasing shortage of resources, the manufacture of recycled PET will become an important development direction of the chemical industry in the future.

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