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:
1. The parts can be made of
thermoplastics, and/or rubber
2. The design consists of multiple layers,
materials (limited to those listed above), and/or colors.
3. Will manufacture both the substrate and
secondary layer
4. Part will not need to be taken apart or
disassembled.
Choose insert molding when:
1. Use a prefabricated substrate.
2. Your substrate is made of metal, wires,
or computerized parts.
3. You want the finished part to be one
solid piece.
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.
How to deal with deformation of voermolding
parts ?
The shrinkage of TPE overmolding is one of
the properties that need to be paid attention in the research and development
of industry even production, when the TPE material starts cooling from the
melting state, its molecules will align with each other, and the shrinkage will
change. So how to solve the shrinkage and deformation of TPE overmolding
products?
Shrinkage and deformation solutions of TPE
overmolding products :
1、Reduce the
thickness of TPE part
2、Use the hardness
of TPE resin is not too high 3、Chang the location of
injection gate to reduce the length of flow and thickness percentage
4、 Use the high
modulus of elasticity material ,for example PP,ABS,PP,PA ect.
5、Modify the mold .
Some products that are deformed or difficult to release are also associated
with molds.
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.
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May 05.2022 
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