Blow Moulding Process Step by Step

The Basics of Blow Moulding

Blow moulding is a manufacturing process used to create hollow plastic parts by inflating a heated plastic tube into a mold. This process is commonly used to create containers, bottles, and other hollow objects.

There are three types of blow moulding: extrusion blow moulding, injection blow moulding, and stretch blow moulding. Each type has its own unique set of advantages and disadvantages.

Step-by-Step Guide to Blow Moulding

1. The first step in the blow moulding process is melting the plastic. This is typically done in a hopper, where the plastic is heated to a specific temperature.

2. Once the plastic is melted, it is extruded through a die to form a tube. This tube is called a parison.

3. The parison is then clamped into a mold, and air is blown into the parison to inflate it to the shape of the mold.

4. The plastic is allowed to cool and harden in the mold, and then the mold is opened to release the finished product.

Frequently Asked Questions

• What materials can be used in the blow moulding process?

  Blow moulding can be done using a variety of materials, including polyethylene, polypropylene, and PET.

• What are the advantages of blow moulding?

  Blow moulding is a cost-effective way to produce high-volume plastic parts. It is also a relatively fast process, and can be used to create complex shapes.

• What are the disadvantages of blow moulding?

  Blow moulding is not suitable for all types of plastic parts. It is also limited in terms of the size of parts it can produce.