Over Molding Supplier In China

Maximize Your Savings with a Trusted Over Molding Partner

Over Molding Manufacturer

Stebro Mold is a well-established plastic overmolding supplier in China. Our product designers, mold designers and tool maker work closely with you to ensure the final product meets your requirements. 

Our services include:

  • 2D & 3D product design and optimization
  • The material selection
  • Rapid prototyping services
  • Cost-effective overmold  tooling solution
  • Mold Flow Analysis to optimize the mold design
  • In-house tooling manufacturing, tooling transfer, mold change, and maintenance
  • Over mold trial
  • Pre-production runs and mass production
  • Part Assembly

We’re here to make sure your projects are a success! With our help, you’ll get your over-molded plastic parts done correctly from the start, within your budget, and on time.

Over molding Plastic Parts

Why Stebro Mold for Over injection Molding Supplier

Customer Letters
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Amanda Lee
CEO & Founder Crix
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Catherine Gilbert
Director at Initech

What is Over Moulding?

Over molding is a manufacturing process that involves adding a layer of material over an existing product or component. The process is used to improve the performance, functionality, and aesthetics of a product.

Over Moulding Process Step by Step

The over molding process typically involves placing the original product or component into a mold cavity, and then injecting or applying the additional material over the top. The resulting part has a layer of material over the original product, which can provide added protection, improved grip, or a more aesthetically pleasing appearance.

Over Molding VS Insert Molding

They are both variations of the injection molding process, but they differ in their approach to combining multiple materials.

Overmoulding is a process that involves the injection molding of a second material directly over a pre-molded part, thereby creating a single part with two or more materials. Typically, the first material is rigid, while the second material is softer and provides additional functionality or improved aesthetics.

Insert moulding, on the other hand, involves the injection molding of a preformed part, referred to as an insert, into the final part during the molding process. The insert is inserted into the mold cavity before the injection molding process begins, and the molten plastic is then injected around the insert to create a single part. Inserts can be made of various materials, including metal, plastic, and others, and are often used to reinforce or add functionality to the final part.

Overmolding involves the direct injection of a second material over a pre-molded part, while insert molding involves the injection of a preformed insert into the final part during the molding process.

Over Ininjection Molding Advantages

  • Improved product functionality
  • Enhanced design options
  • Reduced assembly costs and waste
  • Improved part durability
  • Improved ergonomics
  • Cost-effective compared two shot molding in Low volume

Over Injection Molding Disadvantages

  • Complex process
  • Limited material compatibility
  • Longer cycle time
  • Increased risk of defects
  • Higher tooling cost

Overmoulding Applications

Over molding is a versatile manufacturing process that can be used in a variety of industries mainly as below:

  • Improves the safety, durability, and aesthetics of various components in the Automotive industry
  • Improve the functionality and safety of medical devices
  • Improve the aesthetics and functionality of various products in the Consumer industry
  • Improve the durability, functionality, and ergonomics of tools and equipment.
  • Enhance the performance and durability of various components in the Building and construction industry
  • Improve the safety, durability, and functionality of electronic devices and components

Main considerations in designing Over Molded Part

  • The part design should be optimized for the over-molding process.
  • The geometry of the part, the size, and shape of the over-mold, and the location of the over-mold should all be taken into account.
  • The part should be designed with sufficient draft angles and radii to ensure easy ejection from the mold, and the over-mold should be designed with a uniform thickness to prevent warping or cracking.

Key considerations in over Mold Design

  1. Material selection for the substrate and the overmold material. They should be compatible and offer the desired properties for the application.
  2. Shrinkage factor for the plastic materials
  3. Geometry checking for the part.
  4. Putting the substrate into the mold by robot or manual
  5. Substrate placement and retention in the mold
  6. Feeding, Cooling, Ejection, and venting system in the mold

Over Molded Part Cost

Over Molded plastic component cost=raw material cost + injection molding cost
There are some ways to lower the cost:

  • Reduce the material cost
  • Optimize the mold design to shorten the molding cycle times
  • Increase the cavity number in the mold.
  • Working with a full-service over molding company

Over Moulding Machine

  1. Horizontal Moulding Machine
  2. Vertical Moulding Machine

Over Molding Material

There are many tyes of plastic in the world. However, the choice of materials used for overmolding can impact the durability, functionality, and aesthetics of the final product. TPE, TPU, and TPV are mainly used for the soft material. PC, ABS, PC+ABS, and PA6+GF are mainly used for the rigid plastic.

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