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Double-color injection molding basic guide


Double-color injection molding part

Working principle of double-color injection molding

Double-color injection molding is a process that involves injecting two different colored materials into a single mold to create a finished product with multiple colors. The process is similar to traditional injection molding, but it requires a specialized machine and mold that can accommodate two different materials.

The working process of double-color injection molding

The process begins by preparing two different colored materials, which are typically thermoplastics such as polypropylene or polyethylene. The materials are then loaded into separate hoppers on the injection molding machine. The machine then injects the two materials into a single mold, which is designed to allow the two materials to flow into different sections of the mold. The mold is then closed and heated to a specific temperature, causing the materials to melt and flow into the mold cavities. After the materials have cooled and hardened, the mold is opened and the finished product is removed.

The benefit of double-color injection molding

One of the main advantages of double-color injection molding is that it allows for the creation of finished products with multiple colors without the need for painting or other secondary operations. This can save time and money, and also provides a higher level of consistency and quality compared to traditional methods.


Typical Double-color injection molding parts

Another advantage of this process is that it allows for a greater degree of design flexibility. The two materials can be used to create different effects such as color gradients, patterns, or even to create different material properties on the same part.

The process also offers the possibility of using different materials, for example, a hard plastic exterior and a soft rubber-like grip, providing a better grip and a better aesthetic look.

The limitation of this approach

However, the process also has some limitations. The process requires specialized equipment and molds, which can be expensive and may not be suitable for all types of products. Additionally, it may be challenging to achieve a consistent color match between the two materials, especially when working with different types of plastics.

Sum up

In conclusion, double-color injection molding is a process that allows for the creation of finished products with multiple colors in a single operation. The process has advantages such as saving time and money, providing a higher level of consistency and quality and greater design flexibility, but it also has limitations such as requiring specialized equipment and molds, and it can be challenging to achieve a consistent color match between the two materials. This process is increasingly used in various industries where color and design are vital, such as in the automotive and consumer goods industries, and is expected to continue to evolve providing even more opportunities for product innovation. If you are looking for manufacture for your plastic parts, please feel free to contact us, we provide professional double-color injection molding service.  

Post time: Jan-19-2023

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