Intruduction of EVA Sheet Extrusion Machine
YAOAN EVA sheet extrusion equipment: Tailored for High-Performance Foam Production
YAOAN’s EVA (Ethylene-Vinyl Acetate) sheet extrusion line is engineered specifically to handle the unique properties of EVA, a versatile copolymer known for its softness, flexibility, and resilience. By integrating specialized screw and die designs, this EVA sheet extrusion equipment line optimizes the foaming process, ensuring consistent quality for applications ranging from footwear midsoles to industrial padding.
key features and innovations of EVA sheet extrusion equipment
Below is a detailed breakdown of its key features and innovations:
EVA’s thermal sensitivity and foaming requirements demand precise screw engineering:
Gradual Compression Zones:
Prevents material degradation by avoiding excessive shear heat.
Ensures gentle melting and mixing of EVA resin with additives (e.g., blowing agents like AC, pigments, UV stabilizers).
High Mixing Efficiency:
Barrier screws or mixing sections (e.g., Maddock elements) to homogenize EVA and foaming agents.
Critical for uniform cell structure and consistent density (typically 0.1–0.3 g/cm³).
Wear Resistance:
Screws made from nitrided steel or dual-alloy coatings to withstand abrasive additives (e.g., fillers, recycled content).
L/D Ratio:
Optimized screw length-to-diameter ratio (e.g., 28:1–32:1) for thorough melting and gas dispersion.
EVA’s low melt strength and expansion behavior require specialized dies:
Coat-Hanger Die Geometry:
Ensures even polymer distribution across the die width for uniform sheet thickness (±0.2 mm tolerance).
Adjustable die lips to fine-tune thickness during production.
Foam Expansion Control:
Die opening calibrated to balance pressure drop and gas release, critical for achieving closed-cell foam structures.
Post-die sizing devices (e.g., calibrators) to stabilize sheet dimensions during expansion.
Surface Finish Options:
Polished die surfaces for glossy finishes or textured dies for anti-slip patterns.
Water Bath or Chill Rolls:
Rapid cooling to "freeze" the foam structure and prevent over-expansion.
Multi-stage temperature control for gradual cooling, minimizing internal stresses.
Vacuum Sizing (Optional):
Used for thicker EVA sheets (>10 mm) to maintain dimensional accuracy and surface smoothness.
Temperature Control:
Precise heating zones (150–200°C) to manage EVA’s melting and foaming (AC agent activation at ~160°C).
Venting systems to remove volatiles released during foaming.
Material Flexibility:
Compatible with virgin or recycled EVA, as well as blends (e.g., EVA-PE, EVA-rubber).
Handles high filler loads (e.g., calcium carbonate, carbon black) for cost reduction or enhanced properties.
Output Customization:
Adjustable line speed (5–20 m/min) and thickness (1–50 mm) for diverse product requirements.
| Industry | Products | Key Requirements |
|---|---|---|
| Footwear | Midsoles, insoles, sandals | Lightweight, cushioning, durability |
| Sports & Leisure | Yoga mats, gym flooring, helmet liners | Shock absorption, non-slip surfaces |
| Packaging | Protective inserts, medical padding | Softness, vibration damping |
| Automotive | Gaskets, interior padding | Heat resistance, noise reduction |
| Construction | Anti-vibration mats, insulation | Weatherproofing, thermal insulation |
| Feature | YAOAN EVA Line | Generic Sheet Line |
|---|---|---|
| Screw Design | Low-shear, high-mixing for foaming | High-shear for rigid plastics (e.g., PP) |
| Die Type | Foam-optimized coat-hanger die | Standard flat dies for solid sheets |
| Cooling | Multi-stage rapid cooling | Basic air or water cooling |
| Material Handling | Compatible with blowing agents/fillers | Limited to non-foaming polymers |
YAOAN offers:
Material Testing: Assist in optimizing EVA formulations (e.g., AC agent dosage, filler ratios).
Turnkey Solutions: From raw material feeding to winding/cutting systems.
Automation: PLC/HMI controls for real-time monitoring of temperature, pressure, and line speed.
Energy Efficiency: Optimized screw design reduces power consumption.
Low Maintenance: Wear-resistant components extend machine lifespan.
Eco-Friendly: Supports recycled EVA and PVC-free formulations.
Summary
YAOAN’s EVA Encapsulate Solar Panel Sheet Water-proof Sheet Extrusion Line stands out for its specialized engineering, combining low-shear screws, foam-optimized dies, and precision cooling to produce high-quality EVA foam sheets. Whether for footwear, automotive, or industrial uses, this EVA Encapsulate Solar Panel Sheet Water-proof Sheet Extrusion Line delivers consistent density, surface finish, and mechanical properties, making it a reliable choice for manufacturers targeting soft, durable, and eco-conscious foam products.
The products produced by EVA sheet extrusion machine are widely used in: folders, lampshades, bags, food packaging, electronic packaging, waterproof and leak proof materials, shower rooms and other products.
Yes, we supply detailed user manual for your reference. PLS read it carefully for guide. If there is still problem which could not be solved, PLS contact us, we are ready to help you anytime.
We supply perfect overseas service. We shall send engineers to overseas for machine installation and commissioning and test production guide, and also training to the workers of the buyer. And we are ready to give technical support anytime.
he guarantee period of our machine is 12 months after the machine is installed well in buyer's factory;
Painted the machine with anti-corrosion oil, and then covered with plastic film, and then packed into wooden case or fixed onto wooden pallet as per clients' requirements, or shall be loaded into container with film packing. After fixed all machines, we will use drying agent to keep container inside dry.
