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[Chemical Knowledge]：Production method and process of polyester bottle chip

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Manufacturing method
of polyester bottle
polyester bottle is a kind of chemical raw material widely used in the fields of packaging, fiber and non-woven. With the continuous growth of market demand, the manufacturing method of polyester bottle chips has also been continuously developed and optimized. This article will introduce the production process, raw material selection, equipment configuration and other aspects of polyester bottle.

1. production process
The production process of
polyester bottle chips mainly includes esterification, polycondensation, slicing and other steps. The specific process is as follows:

1. Esterification reaction: a dibasic acid and a diol are added into an esterification reactor according to a certain molar ratio, and an esterification reaction is performed to generate an oligomer.

2. Polycondensation reaction: The oligomer is transferred to the polycondensation reactor, and the polycondensation reaction is carried out at high temperature and high vacuum to generate high molecular weight polyester.

3. Slicing: The polyester melt is cut into sheets of a certain length and thickness by a slicer to obtain polyester bottle sheets.

2. raw material selection

polyester bottle sheet manufacturing raw materials are mainly dibasic acid and diol. The commonly used dibasic acids are terephthalic acid, isophthalic acid, etc.; the commonly used dihydric alcohols are ethylene glycol, propylene glycol, etc. When choosing raw materials, the following factors need to be considered:

1. Purity: The higher the purity of the raw materials, the better the quality of the polyester bottles produced.

2. Cost: The prices of different raw materials are different, and they need to be selected according to production costs and production requirements.

3. Availability: The source and availability of raw materials need to be considered.

3. Equipment Configuration The production of

polyester bottle flakes requires the use of a series of equipment, including esterification reactors, polycondensation reactors, slicers, transfer pumps, vacuum systems, etc. When selecting equipment, the following factors need to be considered:

1. Production capacity: It is necessary to select the appropriate equipment model and specifications according to production requirements.

2. degree of automation: high degree of automation equipment can improve production efficiency and quality, reduce labor costs.

3. Safety: It is necessary to select equipment that meets safety standards to ensure safety in the production process.

4. production precautions

1. Control the reaction temperature and pressure: The esterification reaction and polycondensation reaction need to be carried out at a certain temperature and pressure, and the reaction temperature and pressure need to be strictly controlled to ensure the smooth progress of the reaction.

2. Control the ratio of raw materials: Different raw material ratios will affect the molecular weight and performance of polyester, and it is necessary to strictly control the ratio in accordance with the production requirements.

3. Keep the equipment clean and sanitary: Residues and contaminants inside the equipment will affect the quality and production efficiency of polyester bottles and need to be cleaned and maintained regularly.

In short, the manufacturing method of polyester bottles needs to take into account the production process, raw material selection, equipment configuration and other factors to ensure that the polyester bottles produced have the advantages of high quality and low cost to meet market demand.

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