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Multiple plastic materials into a single injection molded part by Overmolding process

Overmolding - Full Technologies to Meet Your Needs

Designers through overmolding process to add a soft-touch exterior onto their parts to enhance the grip feeling or mold the part in 2 or more different material to implement the functions. The part in overmolding looks more attractive to consumers. There is plastic overmolding, rubber overmolding, silicone overmolding etc. Here's the more in-depth look at its advantages:

1. Implement the functions.

OvermoldingTaking an electric front cover for example, it consists of 2 parts, part one is in hard plastic (typically PC/ABS), part two is a window in clear PC, through molding these 2 parts into one single component by plastic overmolding, we can get a plastic cover not only with clear window but also strong strengthen.

2. Enhance the products performances.

Overmolding injection molding soft touch rubber (typically TPE) on the grip, it can reduce the shock and vibration, provides electrical insulation, dampens sounds, and improves chemical/UV resistance, which highly enhances the products performances after rubber overmolding.

3. Increased shelf appeal.

The overmolded part can in 2 or several colors or materials by over molding, which helps the product to stand out from the competition, it increases shelf appeal.

4. Production available in cost effective way.

Overmolding process is mature in the industry, the overmold parts can be produced cost-effectively even if for low volume production.  

Overmolding Materials

Choosing the right overmold material is critical to your part's success in its application and product's performances. For overmolded parts, we can have the materials:

Over Mold1. Soft plastic (usually for rubber overmolding) is molded into a second hard plastic.

2. Hard plastic such as overmolding nylon, PMMA etc. is molded into a second hard plastic.

We need to consider about the materials' compatibility before using the specific material. If the material is not compatible, the rubber on the hogue over molded grip will be easy to peel off, or even not adhere to the material at all, which directly leads to part' functional problem.  TEAM Rapid as one of the best overmolding suppliers, we have strong partner relationships with resin manufactures, we are able to get special-purpose resins to meet your products over molding requirement at competitive cost, no matter overmolding nylon, cable overmolding or others, we can give you a best solution, contact us today to learn more now.


Manufacturing Perspectives of Overmolding 

It's important to know about clearly of the process, which allows you to have your over molded parts manufacturing more easily. Here, we share our considerations of from overmolding suppliers' perspectives:

Overmolding Considerations

1. For hard plastic molding hard plastic

We need to confirm if these 2 materials are compatible and can adhere well. The thickness of molded layer suggested to be thicker than 0.8mm to avoid short shot, and reserve enough sealing areas on mold to avoid flash issue. We can take overmolding nylon for reference.

2. For soft plastic molding hard plastic.

Soft plastic such tpe overmolded parts

, besides the same considerations as hard plastic over molding hard plastic, we also need to think about the TPE's thickness effects, hardness and coefficient of friction, as all these will directly effect on your part's performances. We can take hogue overmolded grip and cable overmolding for reference.

3. Overmolding vs Insert Molding - Molding Plastic on Metal.

Molding plastic on metal is popular and wide in the industry and rapid manufacturing, both hard plastics and soft plastics are available. Overmolding vs insert molding? It usually depends on the molding areas and parts structure. We need to take full consideration of metal part's structure, how the molding material layer can stick on metal firmly? how can the metal part locate onto the mold?

TEAM Rapid - One of the Best Overmolding Suppliers in China

The overmolding cost at TEAM Rapid is affordable, our advantages:

Overmolding Production1. High precise over molded part such as hogue overmolded grip can be achieved by advanced injection molding equipment.

2. Molding parts consistent quality guaranteed by instrumented molds.

3. Improved part functionality (i.e., creating adjust-resistant seal, or clear plastic window).

4. Low volume production available, and cost-effective for mass production through robotics and automation.

5. Diversities over molding injection materials available, which allows you to get right properties parts.

6. Significant reduce the risk of assembly operations failure modes and save your cost by cutting down the high fall-out rates.

Looking low overmolding cost suppliers in China? To receive a quote or start a discussion about your project, please contact us at [email protected] today.

FAQ about Overmolding

1. What files to send for cable overmolding?

We need the STEP or IGS format 3D files of your products. Our engineers will according to your design and demanded quantities to suggest the available proposals, vacuum casting process to make your over molding prototypes or rapid tooling for over molding small volume prototypes.

2. What is overmolding? How to design it?

Mechanical Interlock

Overmolding follows with the same principles as traditional injection molding processes, 

but a few additional idiosyncrasies in design:

1. Proper draft angles and uniform wall thickness with smooth transition lines maintained in both parts.

2. The wall thickness of over molding areas should be in equal or less than that of the substrate below it.

3. The over molding materials should in lower melting temperature than the substrate.

4. Mechanical interlocks can be used to repair practical chemical bonding.

5. Texturing on the substrate part can help with adhesion.

Have no idea about insert molding vs overmolding? Contact us today for more design tips for your project today, our engineer will tell you the differences of insert molding vs overmolding, and give you the best selection!

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