CO₂ / N₂ Gas Dosing Station
High-Precision Gas Injection for Foam Extrusion Processes
Promix CO₂ and N₂ gas dosing stations are high-precision process control systems developed for physical foaming extrusion applications. Designed for stable and repeatable microcellular foam production, these systems enable accurate gas dosing, homogeneous melt integration and optimized foam structure.
The dosing technology combines mass-flow control, extrusion synchronization and real-time process monitoring to ensure stable foam density, improved product performance and reduced raw material consumption.
Promix gas dosing stations are used in microcellular foaming, lightweight extrusion products and high-performance foam structures across packaging, construction, automotive and insulation industries.
Process Performance Advantages
Promix gas dosing systems provide measurable production and cost benefits:
• Gas flow range from <5 g/h up to 12,000-15,000 g/h depending on configuration
• Operating pressure up to 300-700 bar
• High precision mass-flow controlled dosing
• Stable foam density and repeatable production quality
• Reduced blowing agent consumption by 10-20%
• Increased extrusion output and process stability
• Controlled start-up and fast process adjustment
• Lower material usage and improved sustainability
Physical foaming with CO₂/N₂ allows lower foam densities, improved cell structure and elimination of chemical residues.
Technology Architecture
Promix dosing stations are engineered specifically for physical foaming extrusion:
Mass-Flow Controlled Gas Dosing
• High precision dosing accuracy
• Flow range ratios up to 1:50
• Automatic synchronization with extruder output ("Flow-Match")
• Continuous operation capability
High-Pressure Injection Technology
• Gas injection pressure up to 1000 bar depending on injector configuration
• Maintenance-free injector design
• 100% melt-tight injection
Process Monitoring & Control
• 12.1" touchscreen interface
• Trend visualization and process data logging
• User-defined limits and alarm management
• USB data export and process recording
These capabilities ensure consistent gas dissolution and stable microcellular foam formation.
Technical Specifications (Model Range)
N400 Nitrogen Dosing System
• Maximum operating pressure: 380 bar
• Flow rate up to 3,000 g/h
• Mass-flow control with extruder interface
• Continuous start/stop operation
• Remote maintenance capability
• Dimensions approx. 65 × 70 × 140 cm
• Weight approx. 180 kg
N700 Nitrogen Dosing System
• Maximum operating pressure: 680 bar
• Flow rate up to 3,000 g/h
• High-precision process control and visualization
• Fieldbus compatibility for plant integration
NC350 CO₂ / N₂ Dosing System
• Flow range: 5 g/h - 2,000 g/h or 50 - 15,000 g/h
• Maximum operating pressure: 350 bar
• Mass-flow controlled dosing
• Touchscreen control and USB data logging
Across the full product range, Promix dosing stations provide stable operation and accurate process control under high-pressure extrusion conditions.
Process Stability & Foam Quality
Accurate gas dosing is a key factor for high-quality foam production. Promix systems ensure:
• Homogeneous gas dispersion in polymer melt
• Stable microcellular structure formation
• Narrow residence time distribution
• Improved surface quality
• Reduced process fluctuations
Precise gas dosing combined with static mixing and melt cooling technologies enables consistent foam density and mechanical performance.
Integration in Foam Extrusion Lines
Promix gas dosing systems are designed for easy integration into new or existing extrusion lines:
Typical configuration:
Extruder → Gas Dosing Station → Injector → Static Mixer → Melt Cooling → Die
Integration advantages:
• Retrofit compatibility
• No major extruder modification required
• Short installation downtime
• Full synchronization with extruder throughput
Industrial Applications
Promix CO₂ / N₂ dosing stations are used across multiple foam extrusion processes:
Packaging
• PET thermoform trays
• PS cups and containers
• EPS and XPS packaging materials
Construction
• Insulation boards
• Foam panels
• Structural lightweight elements
Automotive
• Interior foam components
• Lightweight structural panels
Extrusion products
• Foam core pipes
• Profiles and sheets
• Cable insulation
• Technical films
Multiple installations worldwide demonstrate stable operation in PP, PS, PET, PE, ABS, PA and TPE foam extrusion.
Operational & Environmental Advantages
Compared to chemical foaming:
• Investment payback typically < 1 year
• Lower foam densities achievable
• Improved cell structure and mechanical performance
• No chemical residue risks
• 100% recyclable production waste
These advantages support sustainable production and reduced operating costs.
Why Promix CO₂ / N₂ Gas Dosing Stations?
• High-precision mass-flow dosing technology
• Up to 700 bar operating pressure capability
• Flow range from <5 g/h to >15,000 g/h
• Integrated process monitoring and data logging
• Easy extrusion line integration
• Proven performance in industrial foam extrusion
Promix gas dosing solutions form a critical component in modern foam extrusion lines, enabling manufacturers to produce lighter, cost-efficient and high-performance polymer products with consistent process stability.
