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The EVA solar film can be used to bond and fix the toughened glass and the main body of the power generation, so as to prevent the silicon wafer from directly contacting the outer glass and play a protective role.
The EVA film provides good protection without affecting the power generation efficiency of the panel, and the EVA film has many advantages, it is superior in adhesion, durability and optical properties, and the light transmittance is as high as 90%, can withstand high temperature of 85 degrees and low temperature of minus 40 degrees without thermal expansion and contraction, good stability, and will not appear cracking and aging under long-term ultraviolet radiation , It is a strong guarantee for the efficient power generation of solar panels.
Extrusion lines for manufacturing EVA (Ethylene Vinyl Acetate), POE (Polyolefin Elastomer), and EPE (Expanded Polyethylene) solar films are integral in the production of photovoltaic (PV) modules. These films serve as encapsulants in PV modules, protecting the solar cells and ensuring their durability and efficiency. Here's an introduction to the key components and processes involved in a solar film extrusion line:
1. Raw Material Handling
The process begins with the handling of raw materials. EVA, POE, and EPE resins, often supplied in pellet form, are stored in silos or hoppers. These materials need to be precisely measured and fed into the extrusion system.
2. Extrusion Process
The core of the solar film production line is the extrusion process, which typically includes:
- Feeding System: This system ensures a consistent supply of resin pellets to the extruder.
- Extruder: A single-screw or twin-screw extruder melts the resin pellets. For EVA, POE, and EPE, temperature control is critical to avoid thermal degradation.
- T-Die: The molten polymer is forced through a flat die, forming a continuous sheet of film.
3. Casting and Cooling
After extrusion, the hot, molten film needs to be cooled and solidified:
- Casting: The film is cast onto a cooling roll or water-cooled drum, which helps to rapidly cool down and solidify the film.
- Cooling: Additional cooling mechanisms, such as air knives or water baths, may be employed to further reduce the film temperature and stabilize its dimensions.
4. Edge Trimming and Thickness Control
- Edge Trimming: The edges of the film are trimmed to ensure uniform width.
- Thickness Control: The film thickness is continuously monitored and controlled to meet specific standards, often using thickness gauges.
5. Surface Treatment
To enhance the film's adhesion properties, surface treatments like corona treatment or chemical priming may be applied.
6. Winding
The final film is wound onto rolls for storage and transportation:
- Winding System:This system ensures the film is wound with consistent tension and alignment to avoid wrinkles or defects.
7. Quality Control
Throughout the process, various quality control measures are employed to ensure the film meets required specifications:
- Optical and Mechanical Testing: These tests check for defects, measure tensile strength, elongation, transparency, and other critical properties.
- Adhesion Tests: Ensures that the film adheres well to solar cells and other module components.
8. Automation and Control Systems
Modern extrusion lines are equipped with advanced automation and control systems to enhance precision, efficiency, and repeatability. These systems monitor parameters like temperature, pressure, and speed, making real-time adjustments as needed.
1. Automatic gravimetric feeding system makes sure variety of solid, liquid additives and raw materials high-precision feeding.
2. Low-temperature extrusion systems to ensure adequate mixing in the premise of plastination to prevent cross-linking additives.
3. Special design of casting part give the perfect solution to roller adhibition and water spalling.
4. Special online tempering device to get rid of inner stress. Tension control system ensure the flexible sheets conveying placidly during cooling, pulling and winding process.
5. The on-line thickness measuring and defect inspecting system can provide real-time feedback of the production quality of EVA/POE solar film.
| Model | Products Width(mm) | Products Thickness(mm) | Max. Capacity(kg/h) |
| JWS75/JWS120 | 1000-3000 | 0.02-2.0 | 300-350 |
| JWS90/JWS90/JWS90 | 1000-3000 | 0.02-2.0 | 200-300 |
| JWS65/JWS120/JWS65 | 1000-3000 | 0.02-2.0 | 300-400 |
| Note: The specifications are subject to change without prior notice. | |||
- EVA: Known for its excellent encapsulation properties, providing durability, UV resistance, and good adhesion to glass and solar cells.
- POE: Offers enhanced electrical insulation, weather resistance, and a lower water vapor transmission rate, which is beneficial in harsher environmental conditions.
- EPE: Lightweight with excellent cushioning properties, used primarily for protective packaging of solar modules during transportation.
Jwell extrusion line for EVA, POE, and EPE solar films is a complex system that integrates material handling, extrusion, cooling, surface treatment, winding, and quality control. These films play a crucial role in protecting and enhancing the performance of photovoltaic modules, ensuring long-term reliability and efficiency in solar energy applications.
The encapsulation of photovoltaic modules
Glass curtain wall
Car glass
Hot melt adhesive
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