Plastic Injection Molding: Overmolding

overmolding

 

What is Overmolding?

Stack Plastics provides a number of specialized plastic injection molding services, including overmolding. Overmolding is a process which combines two or more molded plastic or elastomer parts into a single finished product.

In the overmolding process, the base layer part is molded first, then the additional plastic layer(s) are molded over and around the original part. A common example of overmolding is a toothbrush with a stiff frame and rubberized grips on the handle.

The Overmolding Process

Overmolding is a very difficult process, requiring adherence to the very tightest of tolerances. The general concept of overmolding is quite similar to insert molding, but presents far more opportunities for mistakes and a much smaller margin of error. Stack Plastics' overmolding processes create parts specifications as tight as 0.001”. We utilize the most advanced injection molding equipment for overmolding, to ensure the highest possible quality and superb repeatability.

Because the materials we use shrink as they cool following the overmolding process, special consideration must be made in the creation of our molds. And, because we use a number of different materials in overmolding, all of which have different cooling/shrinking properties, it is crucial that we create our molds to match the specific properties of the material(s) being used. Our mold designers will perfectly match their mold specs to the unique needs of your overmolding project.

Injection Overmolding with Stack Plastics

The variety of materials we use, the precise capabilities of our equipment, and our mold design services make our overmolding process extremely customizable. Stack Plastics will work with you to create the ideal solution for your exact needs. No matter what the specifications of your project, no matter how low- or high-volume your production run will be, Stack Plastics will meet or exceed the expectations of your next overmolding project.

Contact Stack Plastics to put our overmolding services to work for you today.