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A static mixer for an injection molding nozzle is a static mixing device installed inside the injection nozzle (also known as the shooting tip) of an injection molding machine. Its core function is to perform final homogenization of the molten plastic before it enters the mold cavity, eliminating product defects caused by Non-uniformity in temperature, viscosity, or color.
Unlike disposable plastic static mixer tubes used for two-component adhesives, static mixers for injection molding nozzles are reusable metal components. They must withstand high temperatures (up to 350°C) and high pressures (nozzle pressure resistance can reach 150 MPa) during the injection molding process.
Integrating a static mixer into the injection molding nozzle provides the following significant improvements in process and product quality:
| Area of Improvement | Specific Effect |
|---|---|
| Elimination of Color Defects | Completely resolves color streaks, color spots, and uneven coloration caused by poor dispersion of color masterbatch, resulting in more stable and uniform coloring. |
| Raw Material Cost Savings | Improves dispersion efficiency of color masterbatch, saving 15-25% of color masterbatch usage, while also allowing for a higher percentage of regrind (recycled material) to be used. |
| Improved Product Quality | Achieves uniform melt temperature and viscosity, significantly reducing internal stress, warpage, and sink marks in the finished part, while improving dimensional accuracy and mechanical strength. |
| Reduced Cycle Time | By improving melt flow characteristics, it can reduce melt back pressure by 10-20% and lower melt temperature by approximately 10°C, effectively shortening cooling time and overall cycle time. |
| Reduced Material Waste | Optimizes flow channel design, reducing cleaning time during color or material changes; some models also feature filtration to prevent impurities from damaging the mold. |
The plasticizing screw of an injection molding machine provides limited mixing capability, especially when dealing with temperature fluctuations or small amounts of color masterbatch. The working principle of a static mixer is to continuously split, reorient, and recombine the melt flow through stationary internal elements, without any external power source.
Taking the classic ROSS ISG (Interfacial Surface Generator) Static Mixer as an example, its interior consists of multiple solid elements stacked together, each containing specially designed passages. As the melt flows through one element, it is divided into 4 substreams. These substreams then recombine at the center of the element before entering the next element for the same operation. The number of layers increases exponentially (e.g., after 3 elements, up to 128 layers are achieved), enabling highly efficient mixing within a very short length.
Several professional companies offer such products, each with its own design characteristics.
| Brand/Model | Key Technical Features | Applicable Clamping Force / Shot Size |
|---|---|---|
| Promix Mixing Nozzle | Emphasizes low pressure drop (≤10-15% of injection pressure) and self-cleaning capability | Customized based on application |
| Toray TMN Series | Developed by Toray Engineering, utilizes their static tube mixer technology with no flow stagnation zones | TMN16: ~150 tons / ~280g TMN20: 70-400 tons / ~2,200g TMN30: 300-1500 tons / ~8,000g TMN40: >1000 tons / ~20,000g |
| Herzog M-Type | Designed specifically for thermoplastics; corrosion-resistant; suitable for up to 30% glass fiber abrasive materials; can be installed without preheating | Contact supplier for details |
| ZERRU (Multi-state Mix) | Chinese solution, claims to reduce melt time and back pressure, increase regrind ratio | Contact supplier for details |
| Shut-off Nozzle | Can be combined with pneumatic/hydraulic needle valve system to prevent drooling, especially suitable for Liquid Silicone Rubber (LSR) injection | 50 tons - 2000 tons; interface sizes M39-M60 |
When to use? Consider installing a static mixing nozzle when you encounter the following issues:
Surface defects: Irremovable flow marks, color differences, or cloudy patterns on the product surface.
Dimensional instability: Significant weight or dimensional variation between parts from the same cavity.
Cost pressure: Desire to reduce expensive color masterbatch or additive usage, or increase the proportion of regrind.
Special materials: Processing engineering plastics (e.g., PA, PC) or glass fiber-filled materials that require high strength and uniformity.
Key selection criteria: The mixer must be precisely matched to the specific plastic material, injection molding machine tonnage, and product requirements. Improper installation or incorrect selection can lead to excessive pressure drop or material degradation.
Important distinction: Be sure to distinguish between reusable metal mixing nozzles for injection molding machines and disposable plastic mixer tubes for two-part (e.g., A/B) adhesives. They differ completely in material, pressure/temperature ratings, and application.
For technical consultation or a custom quote, please contact Wuxi ZERRU Technology Co., Ltd.
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Static Mixer,
Bag Filter,
Basket Strainer,
Filter Cartridges ,
Pipeline Strainers,
Automatic Cleaning Filter
