Overview of Blow Molding Machines: Processes and Methods

What Is a blow molding machine?

A blow molding machine is a device used for plastic processing. It involves melting resin through heat, transferring it to a mold, blowing gas into the resin, cooling it, and shaping it into a product with a hollow interior. This processing method is commonly used for molding hollow bottles and containers.

There are three primary molding methods:

• Extrusion Method: In this method, the resin is heated to a liquid state and formed into a hollow pipe using an extrusion screw. It is then extruded into a mold, which is the key process used in blow molding machines.
• Injection Method: The injection method involves pre-filling a mold that can accept air, moving it to another mold, and then using air pressure to cool and shape it. This approach results in a two-step processing method known for its high dimensional accuracy.
• Stretching Method: The stretching method processes resin by blowing air through an air outlet after stretching it during the extrusion process, providing higher strength compared to other blow molding methods.