Plastic Closures: Injection vs. Compression – What Will You Choose?

by | Dec 6, 2019

It’s inevitable during the manufacturing process, you’ll run into having to choose between compression molding vs injection molding. Before a decision is made about the best molding process to proceed with, ensure you understand the pros and cons of both types and their applications, e.g. food and/or beverage closure designs. So, how do you know which molding method is better for your manufacturing needs?

Let’s discuss, quickly, the major tenets of both injection molding and compression molding. Injection molding is the general “process where plastic material is heated then injected into a mold cavity.” Usually, injection modeling is seen as better for low volume batches with more intricate shapes.

Specific nuances to injection molding, include the ability to mold in a tamper evidence feature directly as part of the process. You can also easily change sizes and swap out for different material choices. However, due to this process, gates present can cause post-printing challenges. The machinery does also take up a larger space footprint.

Compression molding, on the other hand, begins by extruding the heated plastic, cut, and inserted into the mold cavity. Then the plastic is molded under hydraulic pressure (clamping). Because of this process, compression molding is a great fit for higher volume batches.

The two main pros are the gateless mark which equates to less post-printing challenges. Compression molding also has a much lower energy cost. Both setting up this type of molding process for higher volume production.

Hopefully, you’re now able to carry-on being more informed than before to continue down the manufacturing production path to building a great product.
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