Over mold

  • Overmould Component Tooling Two Shot Injection Mold

    Overmould Component Tooling Two Shot Injection Mold

    Overmolding is a two-step process in which individually molded parts are combined to enhance the functionality of the product. Generally, plastic parts are produced using plastic injection molding. After cooling, they are placed in an overmolding tool and then coated with molten thermoplastic or rubber.

What Is Overmolding?
Overmolding is a unique injection molding process that creating a single part using a combination of two or more plastic or elastomer materials. During the plastic overmolding process, the base layer part is molded first, then the additional plastic layers are molded over and around the original part.
Overmolding VS. Insert Molding, Which Is Better for Your Project?
Here are some tips to determine which manufacturing process is best for your project:
Choose overmolding when: Choose insert molding when:
1. The parts can be made of thermoplastics, and/or rubber 1. Use a prefabricated substrate.
2. The design consists of multiple layers, materials (limited to those listed above), and/or colors. 2. Your substrate is made of metal, wires, or computerized parts.
3. Will manufacture both the substrate and secondary layer 3. You want the finished part to be one solid piece.
4. Part will not need to be taken apart or disassembled.  
What is the Benefits and Limitations of Overmolding?
Overmolding offers many benefits, but also has a few limitations that you need to be aware of.
Benefits of Overmolding:
• Reduced secondary operations, assembly and labor costs
• Improved grip and ergonomics
• Creating a waterproof seal
• Providing electrical insulation
• Dampening of vibrations or to absorb sound
• Colorful aesthetics
• Flexible mechanical features for fitment and / or function
Limitations of Overmolding:
• Similar to injection molding, overmolding has excessive upfront costs.
• It is time-consuming and expensive to manufacture and modify tooling out of metal, and two-shot injection molding machines are complex to dial in.
• Need to produce a large number of parts to distribute these costs.
Please feel free to contact us with any questions, to get your next design project started today, simply upload a 3D CAD model at yuanfang.com.