Co-injection
Your Professional Co-Injection Supplier
Our goal is to be your reliable partner for co-injection in China. Hengji Mould & Plastic Co.,ltd is specialized in designing and manufacturing of plastic injection molds for automobile interiors&exteriors and lights, as well as injection molding service. We have a skilled engineering team dedicated to refining every stage, from product development and process improvement to production oversight, ensuring every product delivered meets rigorous quality and performance standards. The price is competitive and the product is quality-assured, which is a good choice for your long-term cooperation.
Why choose us
Production equipment
We have CNC machining centers, five-axis high-speed milling machines, deep-hole drills, EDMs, mold clamping machines, injection molding machines, coordinate measuring machines, and other processing and testing equipment.
Quality control
We strictly adhere to the ISO9001 quality management system and continuously strive for excellent product quality.
Our team
We have a design team staffed with experts in CAE/mold flow analysis, automotive interior and exterior design, and mid- to senior-level technicians. We are a strong and capable team.
Our services
Our team of experts will recommend the most suitable products according to customer needs and provide detailed consultation, we ensure timely delivery, and we provide long-term service support.
Material efficiency
By combining different polymers, manufacturers can optimize the properties of the final product. For example, a rigid core made of hard material can provide structural strength, while a softer skin material can offer a smooth surface finish and improved tactile properties.
Enhanced product properties
The dual-material structure can improve the durability and lifespan of the product. The core material can be chosen for its resistance to impact and wear, while the skin material can be selected for its resistance to environmental factors.
Aesthetic and functional versatility
Co-injection molding allows for greater design flexibility, enabling the production of parts with excellent clarity, multiple colors, textures, and finishes. This capability is particularly valuable for consumer products, where a product’s desired appearance is a critical factor.
Environmental impact
Co-injection molding can reduce waste and carbon dioxide emissions using recycled or lower-grade core and skin material choices, contributing to more sustainable manufacturing practices.
Improved product quality
In packaging applications, co-injection molding can create high-performance barriers that extend shelf life and protect contents from external factors.
Specification of Co-Injection
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Specification |
Details |
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Controller Type |
Closed loop, automatic compensation with manual open loop proportional selector, single zone |
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Control Range |
32° to 1382° F, 0° to 750° C |
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Control Accuracy |
+/- 0.1% of range |
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Key Features |
Auto-Tuning PID function, burst fire relay system, thermocouple failure protection, auto/manual mode |
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Power Requirements |
208 – 240 VAC, Single Phase |
Recyclate usage: Enables the use of recycled content as the core material while ensuring that only food-grade virgin material forms the outer surface, which is crucial for food packaging.
Barrier properties: A crucial benefit for packaging, co-injection can create a thin but effective barrier layer for protection and shelf-life extension, or to contain odors.
Material combination: Allows for combining different materials to achieve desired properties, such as a strong, rigid core with a soft, tactile skin.
Automotive industry: The automotive sector leverages co-injection molding to create components that combine a robust, high-strength core material with a lightweight, aesthetically pleasing outer skin. This results in parts that are not only durable but also meet stringent safety and performance standards.
Consumer electronics: In the consumer electronics industry, co-injection molding is used to produce parts that require a combination of strength, precision, and aesthetic quality. Using different materials in a single molding process creates complex, high-performance components essential in modern electronic devices.
Medical devices: The medical device industry significantly benefits from the precision and material versatility of co-injection molding. Medical components often require biocompatible materials that can withstand sterilization while maintaining structural integrity.
Packaging industry: In the packaging industry, co-injection molding creates containers and packaging solutions that offer superior barrier properties, strength, and aesthetic appeal.
Aerospace industry: The aerospace industry requires materials that can withstand extreme conditions while minimizing weight.
Production Process of Co-Injection
Overmolding vs co-injection
Co-injection molding significantly differs from two-shot molding or overmolding. Although it employs two distinct polymers, it necessitates only a single mold cavity.
01
Primary injection unit
This injects the skin material. The skin material is the first to enter the mold and forms the external layer of the finished product.
02
Secondary injection unit
This injects the core material. After the skin material has been injected and has partially solidified along the mold’s walls, the core material is injected. This material pushes the skin material further against the mold walls and fills the remaining volume.
03
Mold filling
The timing and coordination between the two materials are crucial to ensure proper distribution and bonding between the skin and core materials.
04
Cooling and ejection
After the mold is filled, the part is allowed to cool and solidify before being ejected from the mold.
05
Packing and Shipping of Co-Injection
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Packing |
Box |
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Shipping |
Shipped by road, sea, rail |
FAQ