Overmolding Molding & Inserting Molding
What is Overmolding & Insert Molding?
Overmolding and insert molding are two advanced injection molding techniques that integrate multiple materials into a single, finished part through injection molding. Overmolding involves injecting a layer of soft or different material (such as rubber or thermoplastic elastomer) over a rigid plastic substrate. Insert molding is primarily used to incorporate metal components (e.g., threads and bushings) into plastic parts, resulting in a strong and integrated assembly. Both processes help reduce assembly steps while significantly enhancing the structural integrity, durability, and functionality of the products.
They are suitable for processing multi-material composites and complex parts.
Why choose Overmolding & Insert Molding?
Simplify assembly process
Eliminating traditional assembly steps, reducing the number of parts and connection points, and improving overall product reliability.
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Aesthetics and practicality
Enhancing grip comfort, slip resistance, and aesthetics through the combination of soft and hard materials.
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Suitable for multiple materials
Supports composite molding of various embedded parts such as metal, ceramic, electronic components, and plastic/silicone.
03
Low cost and high efficiency
One time molding reduces production processes, lowers labor and logistics costs, and accelerates product launch cycles.
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Overmolding & Insert Molding Process
Overmolding process
Mold Design:
Design a mold for the substrate, which will form the core part of the final product.
Substrate fabrication:
Depending on the application, the substrate can be made of plastic, metal, or other materials.
Layered injection molding:
Overmold a second layer of material onto the substrate and solidify it progressively.
Cooling:
After mold cools down, overmolded part solidifies, and the finished product is ejected.
The final product is a performance-enhanced multi-material component.
Post-Processing & Inspection
Post-Processing: Remove burrs and test for durability and air tightness.Quality inspectors will conduct defect inspections on products to ensure that the products delivered to you meet high-quality standards.
Inserting Molding process
Insert Preparation
Select inserts (plastic/metal) and compatible soft materials (TPE, silicone).Perform surface treatment to enhance adhesion.Always keep the insert fixed in place during the inserting process to avoid affecting accuracy.
Injection
Inject molten plastic into the mold under high pressure.Utilize vent holes in the mold to evacuate air and ensure complete adhesion to the inserts.
Cooling
Allow the molded part to cool gradually, solidifying around the inserts.Minimize internal and peripheral stresses around the inserts during cooling.
Mold-Part Separation
Open the mold after cooling and eject the finished part.
Post-Processing & Inspection
After removing flash and apply surface treatments.Quality inspectors will conduct defect inspections on products to ensure that the products delivered to you meet high-quality standards.