Premium Overmolding Service | Custom Injection Solutions

What is Overmolding?

• Overmolding is a specialized production process in which a single material is directly molded on top of a substrate in order to form a single part that is bonded together. The substrate can be metal, plastic, or rubber, and the overmold is generally a softer substance such as TPE, TPU, or silicone. Such a combination helps you with increased grip, increased comfort, increased insulation, increased impact resistance, and increased product durability.
• Contrary to basic injection molding, overmolding manufacturing combines materials, functions, and performance features in one product with no adhesives and few assembly processes. And when an overmolding service provider does it professionally, the bond strength becomes extremely dependable even in the case of thermal variation, friction, stress, and extreme usage.

Why is Overmolding a Necessity in Manufacturing Nowadays?

The current trend of brands is the desire to have the product, which appears high-end, with a comfortable feel and durability, and that works perfectly well. All these are accomplished through overmolding through the addition of:

• Soft-touch textures
• Vibration-resistant overmold and shock absorber.
• Improved ergonomics
• Waterproofing and sealing
• Electrical insulation
• Increased chemical resistance.

Overmolding is in toothbrush handles, in medical syringes, in power tools, in earbud cases, in car connectors, and in wearables--omnipresent.

Forms of Overmolding Services

To make the situation a bit more lucid, we can divide the various types of custom overmolding services that are currently available:

• Overmolding of Plastic Service

In order to produce soft-touch and durable surfaces, TPE, TPU, ABS, PC, or PP are molded over a rigid plastic base.

• Rubber Overmolding Services

Bendable and with high grip by applying silicone rubber, synthetic rubber, or elastomers on plastic or metal substrates.

• Metal Overmolding Service

Coating metal inserts, connectors, electronic, and industrial tool components with thermoplastics.

• Injection over Molding Service

A fully automated injection molding machine to achieve high precision in overmolding and a uniform quality.

• Custom Overmolding Services

Custom-made solutions, including tooling, mould design, multi-shot molding, and engineering consultation for special purposes.

In search of a reliable partner with high performance in all these parameters, SunOn is identified worldwide as having high achievement in craftsmanship and engineering performance in injection molding and overmolding.

Plastics in the Overmolding Process: The Science of Bonding to Perfection

The key to successful overmolding is in material choice. The material you have chosen will define:

• Adhesion performance
• Chemical compatibility
• Durability
• Flexibility
• Temperature resistance

The most popular materials in the industry are as follows:

• Overmolding of Thermoplastic Elastomers (TPE)
• Gives exceptional elasticity, grip, and a nice feel.
• Bonding Thermoplastic Polyurethane (TPU).
• Perfect in abrasion, elasticity, and tight-fitting.

Silicone Rubber Overmolding

Appropriate for medical devices, wearables, and high-temperature environments.

ABS Plastic Overmolding

A solid base material that is rigorous and has good bonding properties.

Polycarbonate (PC) Overmolding

It can be used in high-impact and optical-grade applications.

Nylon Substrate Material

Highly structural and long-lasting, typically employed in tooling and auto components.

Soft-Touch Overmold Materials

Applied to electronics, hand tools, sports equipment, and consumer products.

Technical Overmolding: Technological Operations

The science of engineering is behind every successful over-molded product. State-of-the-art factories such as SunOn have integrated digital technology that perfectly simulates and manufactures with high precision.

• Two-Shot Molding (2K Molding)

Two substances are poured into a single mold, creating a strong chemical bond.

• Multi-Shot Injection Molding

Multi-layer structures or high-quality finishes are accomplished by the combination of three or more materials.

• Insert Molding Vs Over Molding

Insert molding loads the metal or plastic inserts into the mold and then injects the material.

Overmolding is Introduced Later into the Solid First Material

Each has its advantages except when it comes to the part structure.

• Plastic-to-Metal Bonding

Connectors, medical devices, robotics, and defense equipment.

• Overmolding: Chemical Bonding Process

Thermal, mechanical, and chemical bond strength is ascertained by material compatibility.

• Mold Cavity Design

The engineers design mold cavities optimally concerning shrinkage control, pressure flow, and dimensional stability.

• Injection Molding Tooling

The durability, cycle time, and consistency of surface finish are determined by high-grade steel molds.

• Mold Flow Analysis

Using simulation software (CAE/CAD tools), the paths of the flows, bonding areas, and defect risks are predicted before making the tools.

• Optimization of Cycle Time Used in Overmolding

High-level temperature control systems enhance efficiency and minimize manufacturing costs.

Overmolding Applications in the Industries

Overmolding is extremely versatile and therefore can be used in a myriad of applications:

• Electronic Components: Overmolding.
• Connectors, switches, cable assemblies, protective housings, sensors.
• Medical Device Overmolding
• Syringe handles, operating tools, diagnostic tools, soft-touch parts.
• Overmolding of plastic in the automobile industry.
• Knobs, seals, connectors, and inside accessories, vibration-resistant.
• Overmolding of Consumer Products.
• Phone cases, toothbrushes, wearables, sports equipment.

Why is SunOn the Industry Leader in Overmolding and Injection Molding?

SunOn has earned a new worldwide popularity in terms of quality, accuracy, low cost, and technical competency. Experience: Decades of experience in:

• Custom mold fabrication
• Injection molding and overmolding.
• CAD/CAE design
• Rapid prototyping
• DFM (Design for manufacturability)
• Multi-material mold construction technology.
• Engineering shrinkage control.

They offer incomparable OEM services, so they become a reliable contract manufacturer to corporations across the globe.

What Influences the Cost of the Overmolding?

Pricing will determine when the customers require a cheap overmolding service:

• Single-shot, two-shot, multi-shot.
• Complexity of molds and the design of tools.
• Type of material (TPE, TPU, silicone, engineering plastics)
• Part size & tolerance requirements.
• Production volume
• Finish and cosmetic requirements on the surface.
• Secondary processes (assembly, welding (ultrasonic), trimming)

SunOn aims at designing molds at a low cost that assist customers in cutting costs and not compromising on quality.

Finding the Right Overmolding Partner

In choosing a provider, you need to take into account:

• Technical expertise
• Quality certification
• Engineering support
• In-house tooling capability
• Strong material knowledge
• CAE/CAD simulation support
• Fast lead times
• Healthy manufacturing setting.

SunOn is also the best in all these categories, thus becoming the best overmolding company to outsource to, particularly those companies that require high precision.

Conclusion:

Due to the constant development of industries, the demand for custom overmolding service, soft-touch finishes, multi-material bonding, ergonomic finishes, and high-durability components will only increase. The possibilities of overmolding are endless in terms of innovation, be it in medical devices, consumer devices, automotive, electronics, or industrial tools. When you are in need of finding the ideal blend of technology, craftsmanship, and affordability, the search begins with SunOn.