Have you ever wondered how a screw driver is manufactured?The answer is overmolding. What is it? The overmolding process involves the use of two separate materials to form one cohesive component. There are two types of overmolding: insert and “two-shot”. Insert overmolding, the more popular process, is an injection molding process where one material (usually elastomeric) is molded “over” a secondary “substrate” material (usually a rigid plastic or object).Overmolding can add immeasurable value to product design by enhancing the end users experience in terms of comfort, ergonomics, and ease of use. In order to achieve this level of manufacturing there are two important concepts that must be understood for success to take place:1) Know your materialsThe materials used need to be compatible so that your designs attain a high level of molecular adhesion. Know what the melt temperature is of your substrate and overmold. If the melt temperature is lower on your substrate than your overmold material, then you are in for a big problem! Also, if you are using color, make sure your color concentrate is compatible with your other materials and won’t degrade their properties. Using the right materials could make or break your designs.2) Understand your designsWhen designing, you need to consider how much or how little you want your substrate and overmold to stick. Don’t count on the material alone to create the adhesion that you want. To ensure that the components “mesh” well with one another use mechanical interlocks such as these:picture14Knowing the proper rules for overmolding can yield a very successful and aesthetically pleasing product. Feel free to contact at www.quickparts.com to learn more about overmolding and how Quickparts can help!