How Is Plastic Molding Different From Plastic Machining?

plastic molding machine

In plastic manufacturing, there are many factors to consider for a consistent production run. You don’t just need the right plastic molding machine but also a suitable processing solution.

Both plastic machining and injection molding offer many benefits to manufacturers, regardless of their industry. If you can’t decide between the two, let’s go through their differences and advantages.

Plastic Molding

In plastic (injection) molding, you produce parts or components by injecting molten plastic materials into molds. The thermoplastics melt into a barrel, moving across different channels. Once the part cools down, you can remove it from the mold and end with a finished product.

Plastic blow molding equipment is apt for conditions where product teams need large volumes of plastic parts. In injection molding, ejector pins are used to remove the cooled parts by force, but this leaves behind imperfections on the surface.

Injection mold tooling also requires a significant investment in its setup, operations, and maintenance. Sometimes, a change of approach is necessary. If you predict your part’s design may need a change, machining will prove to be a better option.

Plastic Machining

CNC machining depends on computer-aided applications. Using the software, you can cut, mold, or reshape plastic blocks with ease. The data files are encrypted codes that convey your specifications to the tool.

CNC machining is a subtractive process that allows you to create parts by removing material from a larger headpiece. Using cutting tools and high-speed rotation, precision machining ensures accuracy and high quality.

Difference Between Molding and Machining

Here are some common differences between plastic molding and CNC machining.


Plastic machining allows you to choose from a wide array of materials for part production. But machining isn’t suitable for softer materials. It works best for high-performing thermoplastics. On the other hand, molding is excellent for flexible substances like rubber. However, it does limit your material options.


CNC machining is a fast, effective, and accurate method for machining low-volume parts. If you need 10 pieces of the same product within a short span, machining is your first choice. In contrast to machining, plastic blow molding equipment entails a slower process. If you need to produce a large shipment where time is not deficient, molding is suitable.


From finding a plastic molding machine to hiring trained labor, injection molding can get expensive. While the cost per mold is relatively cheaper, it’s the resources that cost more when you opt for the process.

Machining helps improve operational efficiency since it’s automated. In contrast to plastic injection blow moulding, this particular technique requires less manual intervention. As a result, labor cost gets reduced as well.


One of the biggest benefits of CNC machining is its ability to adapt to change. Machining allows companies to address updates in the design. It allows you to add features or reshape a part using computer-aided software. In comparison, plastic injection blow molding is not flexible when it comes to design. For this reason, molds can rarely accommodate changes in structure.

Work With an Expert Plastic Molding Manufacturer

Plastic machining and molding are both viable manufacturing techniques. To enhance your production rate, turn to Pet All Manufacturing Inc.

You can also find the best plastic processing option for your next project right here. At Pet All Manufacturing Inc., we provide flexible fabrication solutions as per your project and material requirements.

Thank you for your interest in Pet All products. To request a quote or ask a question,
Please send us a message!

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