In the field of plastic bottle production, the bottle blowing machine is a key equipment, and its working principle directly affects production efficiency and product quality. Among them, the two-step blow molding machine is a common type of blow molding machine with unique working principles and advantages. This article will take an in-depth look at how a two-step blow molding machine works and its role in different application areas.

The working principle of the two-step bottle blowing machine mainly includes the following steps:

Step One: Injection Molding

1. Feeding: First, feed the preheated plastic pellets or blanks into the hopper of the injection molding machine.
2. Heating and injection: Inside the injection molding machine, the plastic particles are heated and melted by the heating system, and then the molten plastic is injected into the mold cavity through a screw injector.
3. Molding: The plastic is cooled and solidified in the mold to form a prefabricated blank (also called a prefabricated embryo).

Step 2: Blow molding

1. Heating: The preformed blank is fed into the heating area or heater of the two-step blow molding machine and heated again to make it soft.
2. Blowing: The plastic is blown with high-pressure air or nitrogen to fill the mold cavity and form the shape of the bottle.
3. Forming: The plastic is cooled and solidified in the mold to form the final plastic bottle. The mold is opened, the finished bottle is taken out, and the entire production process is completed.

The two-step bottle blowing machine has the advantages of high production efficiency and stable product quality, and is widely used in food, beverage, medicine, cosmetics and other industries. In the food industry, the two-step blow molding machine can produce food packaging bottles with high transparency and high temperature resistance; in the pharmaceutical industry, it can produce pharmaceutical packaging bottles that meet pharmaceutical hygiene standards; in the cosmetics industry, it can produce bottles with exquisite appearance and consistent with the brand image. Cosmetic packaging bottles.

In general, the two-step bottle blowing machine, as an efficient and stable plastic bottle production equipment, plays an important role in different industries. By having an in-depth understanding of its working principle and application fields, we can better utilize the advantages of the bottle blowing machine, improve production efficiency, meet market demand, and promote the development of the plastic packaging industry.