Types of Blow Molding Machines

Blow Molding Machines
A blow molding machine is a type of manufacturing machine that uses the plastic forming process to produce hollow bottles and containers. These products are used for everything from cleaning supplies to soda and water.

There are three different types of blow molding processes: injection, extrusion and stretch. Each has its own advantages and disadvantages.

Injection Blow Molding: This approach is most commonly used to make hollow glass and plastic objects in large quantities. This approach involves injecting a polymer or liquid material into a core pin; the blow molding machine then rotates the pin until the plastic is inflated into its shape.

Then, the molded part is blown into a mold and cooled to harden. Once the plastic has cooled, it is removed from the mold and ejected.

Extrusion Blow Molding: This approach is used to produce many different kinds of bottles and jars. It involves heating and inflating a tube called a parison with a predetermined length, which is held in a split die.

When the length is correct, the mold is clamped around the parison until it has formed in the required shape. The accumulator die then opens to release the molded product.

The parison is made from a variety of materials including Low-Density Polyethylene (LDPE), High-Density Polyethylene (HDPE) and polyvinyl chloride.

The process is a challenge to the world’s dwindling oil supply, as it relies heavily on petroleum. It also produces plastic that does not biodegrade and therefore poses a serious environmental threat. It requires a wide range of manufacturing processes and is not easily automated, which can create waste.