Blow Molding machines are a type of equipment widely used in the plastic bottle manufacturing industry. They are of various types and have different functions. Understanding the types of blow molding machines is of great significance for plastic bottle manufacturers to optimize production processes and improve product quality. This article will introduce different types of blow molding machines in detail to help companies better choose suitable equipment.

Basic classification of blow molding machines

Blow molding machines are mainly divided into two categories: extrusion blow molding machines and injection blow molding machines. According to different process flows, they can be further divided into the following types:

1. Extrusion blow molding machine

Extrusion blow molding machines heat and melt plastic particles through an extruder, extrude them into tube blanks through an extrusion die head, and then blow them into shape in the mold through compressed air. This type of blow molding machine is suitable for the production of hollow products, such as plastic bottles, oil drums, etc. The advantages of extrusion blow molding machines are simple equipment, high production efficiency, and suitable for large-scale production.

2. Injection blow molding machine

The injection blow molding machine combines the two processes of injection molding and blow molding. The plastic particles are first injected into the bottle blank, and then heated and blown for secondary molding. Injection blow molding machines are usually used to produce high-precision, high-quality plastic bottles and are widely used in food, beverage, medicine and other industries. Its advantage is that the product has high precision and is suitable for producing bottles with complex shapes.

3. Stretch blow molding machine

Stretch blow molding machine is based on the injection or extrusion process, adding a stretching step, that is, during the blow molding process, the preform is stretched longitudinally and transversely by a mechanical device to rearrange the plastic molecules, thereby improving the strength and transparency of the bottle. Stretch blow molding machines are mainly used to produce PET bottles, such as mineral water bottles, carbonated beverage bottles, etc.