Supercritical CO2 Foam Sheet Extrusion Line
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The Supercritical CO₂Foam Sheet Extrusion Line is an advanced physical foaming system designed to produce high-performance, lightweight foam sheets using supercritical CO₂as the blowing agent. Compared with traditional chemical foaming processes, this technology offers clean production, uniform microcellular structure, precise density control, and excellent mechanical properties.
This line is widely used for producing foam sheets made of:
PET (Polyethylene Terephthalate)
PP (Polypropylene)
PLA (Biodegradable materials)
TPU and other engineering plastics
Process Flow
It consists of a loading system, dehumidification drying system, metering system, twin screw extruder, vacuum system, foaming gas injection system, melt pump, single-screw extruder, trolley drying ovens（Cooling and shaping）, haul-off unit, and winding system.
Working Principle
Each constituent material is transported to the drying tower through the vacuum loading system, and the loading amount is controlled by the material level sensor in the drying tower. The drying tower allows hot air to pass through the material from bottom to top, removing moisture from the material. After dehumidification and drying, the constituent materials are cooled in the transition silo and then fed to the twin-screw extruder by a loss-in-weight feeder according to the set ratio.
The twin screw extruder melts and plasticizes the materials, while the vacuum system removes residual gases and volatiles. Then, the gas metering system uniformly injects various foaming gases into the material in the twin-screw extruder uniformly. The high-pressure melt containing foaming gases is transported to the single screw extruder by the melt pump, where the foaming gases reach a supercritical state and dissolve into the resin to form a homogeneous melt.
The homogeneous melt is cooled and conveyed by a single screw extruder to the foaming mold. After extrusion through the tubular die, phase separation and rapid foaming expansion occur, followed by surface cooling in the air-blowing system. The tubular sheets, preliminarily cooled, are divided by a cutter and unfolded into continuous sheets. These sheets undergo further cooling and winding through a multi-roller and haul-off system. By adjusting the raw material ratio, gas injection amount, process parameters, and traction speed, foam sheets of different densities and thicknesses can be produced.
Technical Parameters
| Machine size | CBF-20 | CBF-50 | CBF-100 | CBF-150 | CBF-300 | CBF-500 |
| Throughput Rate | ~20kg/h | ~50kg/h | ~100kg/h | ~150kg/h | ~300kg/h | ~500kg/h |
| Foaming ratio | 3~30（adjustable） | |||||
Why Choose Supercritical CO₂ Foam Sheet?
Advantages Compared with Chemical Foaming
| Supercritical CO₂ Foaming | Chemical Foaming |
| Clean & residue-free | May leave decomposition residues |
| Better cell uniformity | Less stable cell structure |
| Lower environmental impact | Potential VOC emission |
| Easier density control | Harder to fine-tune |
The Supercritical CO₂ Foam Sheet Extrusion Line represents a next-generation lightweight material solution, combining environmental sustainability, advanced microcellular technology, and high production efficiency. It is particularly suitable for manufacturers seeking:
1.High-quality thermoformable foam sheets
2.Sustainable packaging solutions
3.Cost-effective lightweight products
4.Advanced physical foaming technology
Applications of Supercritical CO₂ Foam Sheet
Supercritical CO₂ foam sheets are widely used across industries due to their lightweight structure, high strength-to-weight ratio, excellent cushioning performance, and eco-friendly production process.
Food Packaging Industry、Protective & Industrial Packaging、Automotive Industry、Construction & Building Materials、Electronics & Appliance Industry……
