Extrusion Blow Moulding

Blow molding makes hollow parts, such as containers or bellows. We create a part by extruding a tube of plastic, called a parison, and then closing a mold on it. We pinch the tube at the bottom, welding it together, and then insert a blow pin in the top, which seals the top of the mold. We then inject air through the blow pin, which inflates the parison to conform to the shape of the mold. The mold opens, and the new part drops out.

Sounds simple, doesn’t it? Actually, to get to the point where the part drops out, our team works through an immense number of designs, material, and production variables to create a process that reliably produces parts that do exactly what our clients want and nothing that they don’t.

Designing for Manufacture

Successful blow molding projects start with our engineers’ involvement early in the development process. Our engineers work with your team to ensure that your part meets functional requirements and is able to be manufactured with a stable process to ensure consistent results.

Experience with Engineered and Commodity Plastics

Our team of engineers has more than 30 years of combined design experience working with products of all kinds. We work with a wide range of materials:

With these materials, we can achieve an array of functional properties, such as chemical resistance, bio-compatibility, flexibility, stiffness, compressibility, memory, and travel.

Is Blow Molding Right for Me?

While blow molding is ideal for producing a variety of plastic parts, it is not the right choice for some.

The following checklist will help you determine if blow molding is right for your application:

• Is my part hollow?
• Can my part’s wall thickness have slight variations?
• Would the mold be relatively regular in shape, i.e., without asymmetrical or deep cavities?
• In the case of containers or bottles, would the diameter of the opening be smaller than that of the rest of the part?
• Is my part’s volume between approximately 25ml and 1 Litre?

If you answered “yes” to all of these questions, your part may be successfully blow molded. Please contact us to discuss your application further.