Working principle of blow molding machine

Blow molding machine is a type of manufacturing equipment that is used to create hollow plastic products. It is a process that involves the use of a molten plastic material that is blown into a mold to create a specific shape. There are different types of blow molding machines, including injection blow molding, extrusion blow molding, and stretch blow molding. In this article, we will discuss the working principle of the blow molding machine.

The working principle of the blow molding machine involves four main steps: melting, injection, blowing, and ejection. Let's take a closer look at each step.

Step 1: Melting

The first step in the blow molding process is melting the plastic material. The plastic pellets are loaded into the hopper of the machine, where they are heated and melted. The temperature and pressure of the machine are carefully controlled to ensure that the plastic material is melted evenly and thoroughly.

Step 2: Injection

Once the plastic material is melted, it is injected into the mold cavity. The mold is made of two halves that are joined together to create a hollow cavity in the shape of the desired product. The melted plastic material is injected into the mold cavity under high pressure, where it takes the shape of the mold.

Step 3: Blowing

After the plastic material is injected into the mold cavity, it is allowed to cool and solidify. Once it is cool, the mold is opened, and the hollow plastic product is removed. The product is still in the shape of the mold, so it needs to be blown to the desired size and shape. This is done using compressed air, which is blown into the product through a small hole in the mold. The pressure of the air causes the plastic material to expand, taking the shape of the mold.

Step 4: Ejection

Once the product is blown to the desired size and shape, it is ejected from the mold. The mold halves are separated, and the product is removed. The product is then trimmed and finished to the desired specifications.

In conclusion, the working principle of the blow molding machine involves melting the plastic material, injecting it into the mold cavity, blowing it to the desired size and shape, and ejecting the finished product. This process is used to create a wide variety of hollow plastic products, including bottles, containers, and toys.