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Plastic Overmolding

A popular injection molding technique is Plastic Overmolding, which entails molding one hard plastic material onto another hard plastic material. Chemically joining the outer covering to the substrate is essential for successful Plastic Overmolding. Two materials must be compatible in order to accomplish this, which is why the base material is nearly always a polymer resin of some kind.


The bond will be very weak if there is little to no compatibility between the base material and the outer substance. By embedding mechanical keys into the substrate, such as through textured surfaces, perforations, and bottom cuts, designers can find a solution to this issue. Engineers combined chemistry and technology to create Plastic Overmolding products for optimal strength. Collaboration with plastic overmolding companies further enhances the ability to achieve high-quality, durable overmolded products.

plastic overmolding

Notes for Plastic Overmolding

We need to consider two important process issues - overmolding area and shrinkage rate - when dealing with the two plastic injection overmolding materials. To ensure proper bonding between the two distinct hard plastic materials, the following criteria must be fulfilled:


1

The temperatures required for molding two different types of materials should be at a minimum of 30 degrees. The foundational material requires a higher temperature than the material that is layered on top.



2

The overmolding area of the hard rubber covering material should be as small as possible to avoid the risk of cracking caused by the shrinkage of larger materials.




3

The shrinkage rate of hard rubber cover materials is small. The shrinkage rate of amorphous or semi-crystalline plastics used is usually between 0.4% and 0.6%.

How Does Plastic Overmolding Work?

STEP 1: The substrate material is injected into the mold cavity.


STEP 2: After the substrate cools and solidifies, the overmolding plastic is injected around the substrate.


STEP 3: The overmolding plastic cures and fully covers the substrate.


STEP 4: A final overmolded plastic injection product is removed from the mold and post-process.


Applications for
Plastic Overmolding

Due to the wide selection of materials for plastic overmolding process, it can be used in almost any project you can need. From rubber grips to waterproof seals, plastic overmolding is a cost-effective and highly productive process that can produce various reliable quality products.


At CN, our team can assist you in producing the plastic products you want through this technique, such as, but not limited to:


1. Consumer goods

2. Automotive part

3. Electronic devices and enclosures

4. Medical tools and devices

Advantages of
Plastic Overmolding Products

Advantages of Plastic Overmolding Products

Products that are manufactured using Plastic Overmolding offer a range of benefits for both manufacturers and consumers, when compared to other alternatives. These benefits include:


1. Improve component dependability.

2. Enhance the stability and strength.

3. Lower labor and assembly expenses.

4. Reduce the weight and size of the product.

5. Increase the flexibility of the design.

Advantages of Plastic Overmolding Products
#muiltiple shot molding #advanced injection molding

FAQs of Plastic Overmolding

What is Plastic Overmolding?

Plastic Overmolding is entails molding one hard plastic material onto another hard plastic material.

How Does Plastic Overmolding Differ From Insert Molding?

While plastic overmolding involves molding plastic over an existing object, insert molding involves placing a pre-formed insert (such as a metal component) into the mold cavity and then molding plastic around it.

What Are The Attention Points For Plastic Remolding?

Temperatures, molding area and shrinkage rate.

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