Plastic bottles are usually divided into four steps, compression, injection molding, extrusion and blow molding.

In the first step, the compression molding process is also referred to as molding in the industry, and is used to form thermosetting plastics such as phenolic resins, urea-formaldehyde resins and unsaturated polyester resins.

The second step, the extrusion process, also known as extrusion, is a process in which the extruded resin is continuously passed through a die through an extruder to extrude a product of the desired shape. The utility model has the advantages that the products of various shapes can be extruded, the production efficiency is high, and the automation and continuous production can be realized. The disadvantage is that the method cannot process the thermosetting plastic extensively, and the product size is prone to deviation.

In the third step, the injection molding process can also be referred to as injection molding. Injection molding is a method of injecting a thermoplastic melt into a mold under high pressure using an injection molding machine to cool and solidify the product. Injection molding has the advantages of fast production speed, high efficiency and automatic operation, especially suitable for mass production. The disadvantage is the high cost of the equipment and the mould, and the injection moulding machine is not easy to clean.

In the fourth step, the blow molding process is also called hollow blow molding. Blow molding is mainly a method of inflating a thermal resin parison enclosed in a mold into a hollow product by utilizing the pressure of compressed air, and blowing two methods including a blown film and a blow molded hollow article. Blow molding is mainly used to produce film products, various bottles, barrels, cans, etc.

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