TWO-SHOT MOLDING

Take Advantage of Chemical and Physical Bonds

For product integrity, it is necessary when designing 2-shot components to take into account both mechanical and chemical bonding properties between the two resins used.

AIM specializes in the two-shot molding process. Two-shot molding, also sometimes referred to as overmolding or multi-shot molding, is a process wherein plastic resin is molded around a part made of another resin without removing the part from the molding press. This may be accomplished either by use of a robot, or a rotary platen within the molding press.

Typically, 2 different resins with different physical or chemical properties are used to create an assembly complete form the molding press in a single process. Some common examples are:

Two-Shot Benefits

Aluminum Prototype Mold

Produce products that provide dual functionality such as multi-colored, structural substrate with soft-touch features, components that require gasket or sealing type features, etc.

Using the ‘single tool concept’, part variation is greatly minimized and controlled, creating a high level of repeatability. This removes the potential risk of contamination that exists using a typical two-tool over-molding process.

The entire substrate and over-mold process is accomplished in a single and simultaneous injection molding cycle requiring only ‘one’ tool. A typical alternative to true two-shot molding is an over-mold process that requires additional tooling (one tool and molding process to create the substrate, and another tool and process to complete the over-mold), as well as additional handling and labor. Two-shot can also be used to achieve a high quality multi-color product in lieu of a painting process (which can rub off).

By joining two compatible materials in a single molding cycle, a very strong bond is created without the use of adhesives between the two parts. This process yields a far more robust bonding process then using a over-mold process involving two separate tools and molding operations.

AIM is now Medbio, Clinton Township

You are being redirected to Medbio’s Website, where you can learn more about our expanded capabilities.