Our double injection or two-color injection molding is a cutting-edge manufacturing method that enables a single component to be molded of two different plastic materials or colors. It brings product functionality, 美学, and performance and reduces assembly costs. Our capabilities include;
Double-shot injection molding returns under the name Two-color molding to describe a modern manufacturing system. It enables single-cycle injection of different plastic materials and colors into one mold. Two-color molding produces multiple-colored or multi-material parts directly from the mold-making process. このほかにも, it eliminates the need for additional painting with assembly steps.
A properly designed mold stands essential for achieving accuracy with enhanced operational efficiency and flawless bonding in double-color injection molding processes. Quality production with no defects emerges from the correct choice of materials, optimal gating, shrinkage control core rotation, and proper cooling elements.
Mold design is important, as it is important for proper precision and efficiency. Key design considerations include:
🔹 Material Selection – Choose materials with compatible melting points.
🔹 Gate & Runner System – Optimize flow for seamless bonding.
🔹 Shrinkage Rates – Account for different material shrinkage.
🔹 Core Rotation – Ensure precise alignment of two materials.
🔹 Cooling System – Cooling makes a dream come true to prevent warping and defects.
🔹 Consumer Electronics (buttons, ケーシング, keypads)
🔹 Automotive Parts (dashboard controls, ノブ, トリム)
🔹 Household Products (toothbrush handles, kitchen tools)
🔹 Medical Devices (ergonomic grips, syringe plungers)
Two-color molding (double-shot injection molding) uses a combination of materials with over-molding yet operates dissimilarly in its manufacturing methods. It allows producers to use sequential material delivery into one mold to form strong bonded multi-colored or multiple-material parts that work well in keypad applications, 自動車部品, and consumer electronic devices.
Overmolding wraps a secondary material layer around pre-formed components to create protective outer layers, insulated surfaces, or enhanced grips found in medical devices power tools, and tool handles. Continuous molding processes are positioned as high-precision solutions for volume manufacturing while overmolding optimizes ergonomics and safeguards objects through its layering technique.
Let’s summarize the difference between Two-Color Mold & Overmold in the following table;
特徴 | Two-Color Molding | オーバーモールディング |
プロセス | Simultaneous injection of two materials in one mold | Secondary molding over a pre-existing part |
Material Bonding | The strong chemical bond between two materials | Physical adhesion (sometimes requires primers) |
精度 | High precision and detail | It is good for adding layers but less intricate than two-color molding |
Best For | Complex multi-color parts | Soft-grip handles, protective layers |
料金 | Higher initial mold cost but efficient for mass production | Lower mold cost but may require additional processing |
When your product requires multiple color aesthetics, multiple functionalities, or strong material bonding in one step, here two-color molding is the best way to go. When choosing two color molding, you should go with:
✔ You need a seamless design in multi-colors – choose Tow-color molding. It is perfect for logos, icons, or visually distinct components.
✔ Your product needs different properties – Here hard-soft combinations for better grip, 柔軟性, or permanent durability.
✔ Reduces labor, 費用, および生産時間 by integrating 2 or more materials in one step.
✔ High precision and complex designs – It is perfect for complex components, つまり. automotive dashboards, keypads, buttons, 等.
✔ Requires strong and durable chemical bonding – Longevity for consumer electronics, 医療機器, および自動車部品.
Opting for the right colors in two-color molding is crucial to achieve the required visual impact and functionality. Consider the following factors:
Two-color injection molding enables visually appealing production and functionally improved quality products. Production expenses decrease because secondary assembly steps are removed material bonds stick with product holding surfaces become more durable and production duration shortens for better business efficiency. The process of two-color injection molding produces attractive high-quality products.
The outcome will be optimal when mold design is maximized with correct material bonding precise temperature control and accurate injection sequencing methods. Advanced two-shot machine technology provides precise operations alongside controlled cooling systems that eliminate flaws in high-quality components.
The mission of TOPS Precision is to produce customized high-quality two-color molding products that align with your specifications. Submit your design files to us and we will generate a personalized quotation and offer consultation services.
Two-color injection molding operates from one machine and mold as a single unit to build continuous products but over-molding requires executing separate molding operations on different materials.
Various two-color molding applications use ABS, パソコン, PMMA, TPE, TPU, and PP as material choices.
あ: はい! Two-color injection molding works best when you need to install human-friendly grips on rigid plastic products.
The process has an involved setup stage yet it leads to shorter production timelines since assembly operations are no longer necessary.
Two-color injection molding delivers increased functionality and aesthetic benefits to the automotive sector consumer electronics medical fields and industrial domains.