Injection molding is the most widely used plastic manufacturing process in the world, but it has some limitations. The biggest limitation to injection molding is that it is best for simple plastic parts that need to be made in huge quantities. So what do you do if you need complex, multi-material molded parts?
That’s where overmolding and insert molding come in. The two processes are similar, and both allow you to create a single part using a combination of two or more plastic or elastomer materials.
Overmolding involves molding a base layer first, then molding additional layers over or around the original part. One of the most common examples of overmolding is a toothbrush with a stiff frame and rubberized grips on the handle. You can also use overmolding to create flexible areas on rigid components or add color contrast for aesthetics.
While overmolding is a two-step process where separately molded plastic parts are combined, insert molding can start with any substrate, including metal, and involves encapsulating a product in molded plastic.
Material properties can change when two or more resins are combined, so it’s important to choose compatible materials to get the results you want. Some common materials used for injection overmolding include:
Here are some common examples of overmolding and insert molding:
Some of the many benefits and possibilities of overmolding and insert molding include:
With more than 50 years of injection molding experience, Universal Plastic Mold is the right choice for your overmolding needs. To learn more or to get a quote, click here or call 1-888-893-1587.