What is the working principle of the blowing machine?

Blowing molding is a common plastic molding process and is widely used to manufacture hollow plastic products. This process involves heating the plastic material to a molten state and then blowing it into the desired shape. Blowing molding is mainly divided into the following several types: Extruded blow molding:

1. This is the most common method of blow molding, used in the production of bottles, containers, and other hollow products.

The process is as follows: Heat and extrude the plastic particles into a hollow tubular molten plastic (called a type or pre-blank).Clip the blank in the mold and blow into the blank through the nozzle to expand and fit to the inner wall of the mold to form the desired shape.After cooling, open the mold and remove the finished product.

• Injection blow molding (Injection Blow Molding): -This method is suitable for small and high-precision hollow products, such as medicine bottles and cosmetic containers. The process is as follows: -inject the plastic into a mold to form a prefabricated billet.-Transfer the prefabricated billet to the blow mold and expand it by blowing.

After cooling, remove the finished product.

• Tensile blowing (Stretch Blow Molding): Usually used for the production of PET beverage bottles. The process is as follows: -inject the plastic material into a prefabricated billet.

Heat the billet and put it into the blow mold.-Pull the simultaneously axially and radially by mechanical device and air pressure to form the desired bottle shape.-After cooling, remove the finished product. The advantages of the blowing process include:

Can produce hollow products with complex shape and stable size.-High productive efficiency and suitable for mass manufacturing.-High material utilization rate, less waste material. Due to its wide application and efficient production capacity, the blowing process has been widely used in packaging, automobiles, toys and household goods.