Over Molding

Over molding is a special plastic molding process. Overmolding insert moldingis similar to the two-color molding or two-shot molding process. Metal overmoldingcan make the surface of the product full of softness and increase product functionality and added value.

With this technology, product functions can be increased, such as noise reduction, vibration reduction, waterproof, anti-collision and added value. Overmolds is widely used in mobile protective shells/mobile protective sleeves.

Overmolding Process

Plastic overmolding has a process in which a certain materials used in injection moulding is molded in a primary plastic mold, and the molded part is taken out and placed in a secondary molding mold to inject the same or another plastic material into overmolding process. Overmolding process has key factors as below:

Overmolding Process

Overmold vs insert mold

Overmolding & insert moldingare very similar, but there are significant differences between the two processes. Injection overmolding is a two-step process in which two separately molded parts are combined to enhance product functionality. While insert injection molding is a slightly faster process because the two plastic materials are molded at the same time. Besides, over molding can not only give designers and engineers more creative freedom, but cost-savings of assembled parts as well. Whether you choose insert molding or over moulding, we understand the importance of creating a strong bond between components. We'll recommend the right innovative polymer solution, like thermoplastic polyurethane overmolding (TPU overmolding) to deliver the chemical adhesion you need.

Over Molding VS Two Shot Molding


​Two-shot injection molding

Two-shot injection molding is also called two-color mold injection. 2 shot injection molding, also called 2k injection moulding, is to inject two plastic materials on the same injection molding machine in two moldings, but the product is only ejected once. The mold is usually completed by a set of molds and requires a special two-color Injection molding machine.

The same back mold, different front molds, high production efficiency, good product quality, suitable for mass production.


Over molding

Over molding, the two plastic materials are not necessarily injected on the same injection molding machine, but are molded in two parts; after the product is taken out from one set of molds, it is placed in another set of molds, inject molding. Therefore, this molding process is usually completed by two sets of molds, without the need for a special two-color injection molding machine.

Injection overmolding is to first take part of the product out of injection molding, and then put it into another injection molding machine for injection molding. The efficiency will be slower and the cost will be higher, so it is suitable for small batch production.

Why so many manufacturers like over molding?

Regarding this problem, we can learn one or two from the advantages of secondary molding.

First, product quality of molding over molding can be improved. Double injection molding can optimize the copolymerization of hard and soft materials to form strong molecular bonds. The result is a single part with production and feature advantages. It can be used for various product designs in injection moulding applications. It also allows the use of transparent plastics, colorful graphics and fashionable finishes for molding, thereby improving your product functionality and market value.

Second, plastic injection overmoldingcan reduce the cost of production. Complete the entire production process in one injection molding machine, two-shot injection molding effectively reduces unit costs, reduces processing and secondary assembly, reduces costs and waste associated with assembly defects, thereby shortening the molding cycle and improving work efficiency.

Furthermore, two-shot injection molding can improve people's experience. Over the past 10 years, two-shot injection molding technology has completely changed the aesthetic standards, design ideas, and functional requirements of consumer products. The use of plastic materials with different textures has improved the touch and function of products. Many of the common toothbrushes and mobile protective cases in our lives are products produced by using two-shot injection molding technology.

As a professional china injection mold maker, Keyplast offers injection molding supplies, overmold design, molding over molding, etc. Keyplast sincerely invite you to visit our company and establish long-term business relationship with us.

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