If you’re interested in custom plastic parts, you might want to consider our expertise in multi-shot injection molding and two-shot plastic injection molding. With these processes, we can efficiently and economically mold parts using two or more plastic resins or colors in one operation. Our team has extensive experience in designing and manufacturing high-quality molds for a wide variety of multi-shot and two-shot injection molded plastics.


Two Shot Injection Molding

Two shot injection molding is a manufacturing process used to produce complex plastic parts with two different materials in a single operation. It involves injecting two different thermoplastic materials into a mold in a sequential or simultaneous manner. The process enables the creation of highly precise and functional parts with a seamless appearance.

This process is sometimes referred to as 2K, multilayer, or multi-shot injection molding. Multi-shot manufactured products eliminate steps in the manufacturing process while creating a more cost-effective, enhanced finished product.

To ensure bonding between the two parts undergoing the two-shot molding process, they must be chemically compatible. At WIT MOLD, we consult with customers and material suppliers to ensure proper material selection for the specific application.

The two-shot molding process improves the final product in terms of feel, color, and functionality. There are many design opportunities to suit specific preferences. For example, toothbrush handles, buttons, switches, caps and closures, and hand and power tools can all be made using two-shot injection molding.

It consists of two main phases. Similar to traditional injection molding, the first phase involves injecting resin into a mold, which is then cooled to form a solid part in the shape of the mold. The second phase involves overmolding the 1st shot by transferring it to a second cavity by robot or rotating platen. The two plastic resins will form a molecular bond and, once cooled and ejected, becomes a finished multi-resin molded part.

Thermoplastics, thermoplastic elastomers, and liquid silicone rubber are commonly used materials for two-shot injection molding.

Advantages of two-shot injection molding

The benefits of Double Injection molding are numerous and significant. This cutting-edge manufacturing process has revolutionized the way plastic parts are made, providing a range of advantages that include cost savings, improved product quality, and more.

One of the key advantages of Double Injection is its ability to lower unit costs. By combining two different materials in a single mold, manufacturers can eliminate the need for costly assembly processes, reducing labor costs and saving time and money.

In addition to cost savings, Double Injection also offers improved part integrity. By bonding two different materials together, this process creates parts that are stronger, more durable, and better able to withstand stress and wear.

Multi-material efficiency is another important benefit of Double Injection. With this process, manufacturers can create parts that feature multiple materials, colors, and textures, all in one single mold. This saves time and reduces waste, while also providing greater design flexibility and more customization options for customers.

In terms of quality, Double Injection is also an excellent choice for plastic part fabrication. This process provides a higher level of precision and consistency, resulting in parts that are more uniform and have fewer defects.

Double Injection also reduces the need for secondary assembly and handling, which can help to further lower costs and improve efficiency. By creating parts that are ready-to-use straight out of the mold, this process eliminates the need for additional work or finishing, saving time and reducing waste.

Double Injection can enhance tactile and cosmetic product features, giving parts a more polished and professional look and feel. This can be especially important for products that need to stand out on store shelves or in competitive markets, helping to boost sales and increase customer satisfaction.

Applications of Two Shot Injection Molding

Secondary molding is the ideal plastic molding process for complex, multi-color, multi-material plastic products, especially in high-volume production scenarios. WIT MOLD serves a wide variety of industries, including automotive, consumer goods, medical, and electronics. The process is particularly useful in applications that require multiple components, intricate shapes, or high precision. Some of the common applications of two shot injection molding include:

Automotive components, such as door handles, steering wheel covers, and instrument panels.
Consumer products, such as toothbrushes, razors, and electronic devices.
Medical devices, such as syringes, catheters, and implantable devices.
Electronics components, such as keypads, switches, and connectors.

Secondary molded components are used in nearly every industry from consumer products to construction, but are most commonly used in applications that require:

Movable parts or assemblies
Rigid substrates with soft grip
Vibration or acoustic damping
Surface depiction or marking
Multi-color or multi-material assemblies


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