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

Overmolding 


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 parts in overmolding looks more attractive to consumers. There are plastic overmolding, rubber overmolding, tpe overmolding, silicone overmolding etc.Here's the more in-depth look at overmolding's advantages:

1. Implement the functions.

OvermoldingTaking a 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 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 TPE Overmolding.

3. Increased shelf appeal.

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

4. Production available in cost effective way.

The overmolding injection molding process is mature in the industry, the overmolded parts can be produced cost-effectively even if for low volume production.  


Overmolding Plastic Materials


Choosing the right overmolding material is critical to your part's success in it's application and product's peformances. For over molding process, we can have the materials:

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

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

We need to consider about the materials' compatibility before using the specific material. If the plastic overmolding plastics are not compatible, the overmolded plastic may easy to peel off, or even not adhere to the second material at all, which directly leads to part' functional problem.  At TEAM Rapid, we have strong partner relationships with resin manufactures, we are able to get special-purpose resins to meet your product’s overmolding requirement at competitive cost, no matter rubber overmolding, plastic overmolding or tpe overmolding on metal, we can give you a best solution, contact us today to learn more now.

 

Considerations of Using Overmolding 


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

Overmolding Considerations

1. For hard plastic over hard plastic

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

2. For soft plastic overmolding hard plastic.

Soft plastic such tpe overmolding, besides the same considerations as hard plastic overmolding hard plastic, we also need to think about the TPE's thickness effects, hardness and coefficient of friction, as all these will directly affect on your part's performances. 

3. Overmolding Plastic on Metal.

Plastic overmolding on metal popular, both hard plastics and soft plastics are available, we need to take full consideration about the structure of metal part, how the rubber overmolding layer stick on metal firmly? how can the metal part locate onto the mold?


TEAM Rapid - One of the Best Overmolding Companies in China


TEAM Rapid as one of the best overmolding in China, our advantages:

Overmolding Production1. High precised overmolded parts achieved by advanced injection molding equipment.

2. Overmolded parts consistent quality guaranteed by instrumented molds.

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

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

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

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

Looking for plastic overmolding, rubber overmolding, tpe overmolding etc in China? To receive a quote or start a discussion about your overmolding project, please contact us at sales@teamrapidtooling.com today.


FAQ about Overmolding


1. What files to send for overmolding prototypes?

For overmolding prototypes, 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 overmolding prototypes or rapid tooling for overmolding small volume prototypes.


2. How to design for overmolding?

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 overmolding areas should be in equal or less than that of the substrate below it.

3. The overmolding 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.

Contact us today for more design tips for your overmolding project today!



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