Advantages of overmolding

Do you want to know the advantages of overmolding ?

To understand the advantages of overmolding, we first explain the over molding process.

Overmolding is an injection molding process, where plastic is molded over a primary component. That main component can be one of the following :

  • Another plastic part.
  • An electric cable.
  • A metal part.
  • Or a printed circuit board.

One of the main rules is that melting temperature of the overmolding plastic is lower that the maximum temperature the over-molded substrate can handle. Else the overmolded item is damaged or destroyed. For example, PC cannot be molded to ABS. The reason is that the melting temperature of ABS is lower than for PC.

Overmolding often requires precision molds. In addition the Overmolding can happen in several steps which makes the investment higher. However, the cost will be won back with the advantages obtained by this manufacturing process.

5 advantages of overmolding?

1. Eliminating of fasteners and adhesives.

We mold two or more components together in a single shot or multiple molding shots. We don’t have to use screws, or glue.

2. Reduced assembly cost – reduced part cost.

As mentioned in the remark above, a single operator assembles the product during the molding process. The process is repetitive and as such eliminates mistakes which could happen during manual assembly. In addition, the molding process eliminates manual handling and it reduces the overall unit cost.

3. Improving ergonomics and user experience.

Imagine the rubber grip layers on a handle, a hair dryer or other electric devices. The outer shell of a connector also is overmolded. Two-shot molding and co-injection molding are different manufacturing processes. However, they are following the overmolding principles. And also, this process is the perfect solution for the production of multi colored products and soft grip layers.

4. Flexibility in Design.

Where CNC milling or assembly of different parts with fasteners and glue reduces the flexibility, overmolding gives us the ability to create different, more complex shapes in a single part.

5. Enhanced quality and performance.

It is possible to use an over molded printed circuit board under water. But also metal contact pins are isolated from each other in a connector, after overmolding.