How are PET plastic bottles made?

In our daily life, we often come into contact with mineral water bottles, oil bottles, beverage bottles, etc., all of which are PET plastic bottles. Do you know how this PET plastic bottle is made? What are the advantages of this plastic bottle?

PET plastic bottle production equipment

There are currently two methods for the production of PET plastic bottles. One is to use an automatic blow molding machine to complete all the steps from PET raw materials to formed PET bottles. Another production method is to use a two-step method, first use an PET preform making machine to make a PET preform, and then blow the bottle through the mold of the bottle blowing machine. The first method can be produced by a fully automatic blow molding machine, but the cost of the equipment is relatively expensive. Generally, large plastic bottle processing plants will purchase plastic bottles using this method. The two-step method is the method that most companies often use to make plastic bottles.

How to make PET plastic bottles?

1. First, heat the PET raw material to melt it into a molten state, and then put it into the tubular mold of the PET preform making machine. The PET has the same shape as the mold called a parison, and after the system cools, the parison is cut to the correct length.

2. Heat the prepared preform and put it into the mold of the PET blowing machine. A steel rod is placed inside the preform and high pressure air is blown to stretch the preform into the shape of the mold.

3. After blow molding, the bottle is quickly cooled and removed from the mold.

4. There may be some excess material seepage during the production process, so trimming is required.

5. The trimmed PET bottle is the bottle that is often used in our daily life.

 

Advantages of PET plastic bottles

PET plastic bottles are resistant to oil, fat and dilute acid. It has good physical and chemical properties, the impact strength is 3 to 5 times higher than other films, and the folding resistance is good. High transparency, can block ultraviolet rays, and good gloss. PET plastic bottles have better rheology in the molten state, and the pressure has a greater effect on the year than the temperature.

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