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Extrusion Blow Molding Machine

What is blow molding machine?

Blow molding machine, especially Extrusion Blow Molding Machine (EBM), is a type of equipment used to manufacture hollow plastic products. This equipment forms a tubular parison (also called a embryonic tube) by extruding molten plastic, and then blowing in air to expand it, close to the inner wall of the mold, and finally form a product of the desired shape. This type of machine is widely used to produce various plastic containers and products.
What is blow molding machine?

How the blow molding machine works?

How the blow molding machine works?
Blow molding is a manufacturing process used to create hollow plastic parts. The process involves several steps and specialized machinery to shape plastic into items such as bottles, containers, and other hollow forms. Here's a detailed explanation of how a blow molding machine works:

Material Preparation

Blow molding typically uses thermoplastic materials like polyethylene, polypropylene, and PET. These materials are fed into the machine in the form of small pellets or granules.
Material Preparation

Melting & Extrusion

The plastic pellets are fed into an extruder, where they are heated until they melt and become pliable. The extruder has a screw mechanism that pushes the molten plastic through a die head, forming a hollow tube-like structure called a parison.
Melting & Extrusion

Parison Formation

le parison, a preform of the final product, is extruded vertically downward between vo halves of a mold. The parison can be extruded continuously for continuous extrusion blow molding or intermittently for intermittent extrusion blow molding.
Parison Formation

Mold Clamping

The plastic pellets are fed into an extruder, where they are heated until they melt and become pliable. The extruder has a screw mechanism that pushes the molten plastic through a die head, forming a hollow tube-like structure called a parison.
Mold Clamping

Blowing

After the mold closes, a blow pin or a needle is inserted into the parison.
Compressed air is then blown into the parison, inflating it and pressing it against the interior walls of the mold. This process shapes the parison into the final form of the product.
Blowing

Cooling

While the plastic is still in the mold, it is allowed to cool and solidify. Cooling can be achieved through various methods such as air cooling, water cooling, or a combination of both.
Cooling

Mold Opening & Ejection

Once the plastic has cooled and hardened, the mold opens, and the newly formed product is ejected from the mold. The excess material (flash) from the parison that extends beyond the mold cavity can be trimmed off in a subsequent step.
Mold Opening & Ejection

Trimming & Finishing

The final step involves trimming any excess plastic, performing quality checks, and finishing the product as needed. The excess material can often be recycled and reused in the process.
Trimming & Finishing