In the field of plastic processing, the double-shot injection molding process offers unique advantages, opening up endless possibilities for product design and manufacturing. This technique allows for the creation of products with dual or multiple color effects using different silicone or plastic materials on the same injection molding machine, greatly enhancing both the appearance and functionality of the products. This article delves into several mainstream double-shot injection molding processes, analyzing their characteristics and application scenarios.
Technical Principle
As the name suggests, the core of mold core rotation two-shot injection technology lies in the rotation of the mold. First, the injection machine injects the first silicone material into small cavities in the mold. After the material forms, the mold automatically rotates 180°, and the second silicone material is injected. Once the second material is fully formed, the final encapsulation is performed, completing the production process of the two-shot product.
Technical Advantages
Excellent Two-Color Quality: The finished product is of high quality, with a smooth surface, no color deviation, and a perfect two-color effect.
Simple and Efficient Operation: The process can be completed with a single molding machine, eliminating the need for complicated mold changes, thereby improving production efficiency.
High Design Flexibility: Various processes can be completed in a single step, providing greater freedom in the design of silicone products.
Common Applications
This technology is widely used in products requiring multi-color combinations, such as fashion accessories and household items. It is also suitable for high-volume, short-cycle production of two-shot silicone products.
Technical Principle
This technique mainly relies on hydraulic devices to precisely control the mold. After the first material has cured, the collapsible core of the hydraulic device moves downward, creating space for the injection of the second material. Once the second material is injected, the core moves upward to press the material, and after curing, the final two-shot product is ejected.
Technical Advantages
High Surface Quality: Products have smooth surfaces and precise dimensions, effectively avoiding issues like deformation, sink marks, and shrinkage.
High Efficiency and Low Cost: The operation is relatively simple, with high production efficiency and low manufacturing costs, reducing the need for post-processing steps.
Common Applications
This process is suitable for producing complex products with high requirements for surface quality and appearance, such as automotive interior parts, industrial machinery components, home appliances, and phone or electronics casings.
Technical Principle: This technology is known for its unique injection cycle. First, the initial material is injected into the mold, followed by mold clamping. The mold then retracts, leaving partial inserts on the ejector plate to cool and be removed. The mold advances again, and two nozzles simultaneously inject the second material. After curing, both materials are ejected together, completing the injection cycle.
Technical Advantages
Vibrant and Unique Appearance: Although the injection cycle is longer, this technique can produce products with rich colors and unique appearances.
Reduced Assembly Steps: The two materials are injected in a single cycle, avoiding the need for additional assembly steps.
Enabling Complex Designs: The dual-material injection process allows for complex geometric shapes and color effects, improving product quality.
Common Applications
Suitable for small to medium production runs or high-value products, such as premium custom goods, art reproductions, and high-quality products with strict requirements for appearance precision, distinct colors, and clear textures.
In summary, each double-shot injection molding process has its own strengths. Selecting the appropriate technique is critical for enhancing product quality, reducing production costs, and shortening production cycles. Companies should flexibly choose and optimize double-shot injection molding processes based on their product characteristics and market demands to stand out in the highly competitive market.
