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

Why Overmolding

Designer through overmolding process to add a soft-touch extrior onto their parts to enhance the girp feeling, or mold the part in 2 or more different material to implement the functions. The parts in overmolding looks more attractive to cunsumers. 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(typiaclly PC/ABS), part two is a window in clear PC, through molding these 2 parts into one single component by overmolding, we can get a cover not only be available to read datas through the clear window but also strong enough to protect the electronic components safty.

2. Enhance the products performances.

Over 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.

3. Increased shelf appeal.

The part can in 2 or serval 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.

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

Overmolding Materials

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

1. Soft plastic (usually TPE) 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 materials are not compatible, the molded material 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 partnerships with resin manufactures, we are able to get special-purpose resins to meet your product’s requirement at competitive cost, contact us today to learn more now.


Considerations of Using Overmolding 

OvermoldIt'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:

1. For hard plastic over hard plastic, we need to comfirm if these 2 materials are compatible and can adhere well. The thickness of overmolded plastic suggested to be thicker than 0.8mm to avoid short shot issue, and have enough sealing surfaces on mold to prevent flashes.

2. For soft plastic over hard plastic, typically for TPE, besides the same considrations as hard plastic over hard plastic, we need to think of the TPE's thickness effects, hardness and coefficient of friction, as all these will directly affect on your part's performances. 

Overmolding at TEAM Rapid

Overmolding Parts1. 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.

To receive a quote or start a discussion about your overmolding project, please contact us at today.

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