What Are the Key Processes of Teflon High-Temperature Cloth in Solar Photovoltaic Module Production?

With its high temperature resistance, non-stick property, uniform heat conduction and insulation performance, Teflon high-temperature cloth from Jiangsu Aokai New Materials is widely used in multiple key processes of solar photovoltaic module production, including lamination, soldering and curing, playing an irreplaceable role in process guarantee. The specific applications and mechanisms in each core process are described below.

1. Lamination Process – Core Application of Teflon High-Temperature Cloth

Lamination is a critical step in PV module encapsulation, where Teflon high-temperature cloth is applied in various forms:

· As cover cloth and backing cloth: Directly covers the upper and lower surfaces of modules to protect glass and backsheets from mechanical scratches by hot press plates, while its non-stick property prevents overflowing molten EVA/POE adhesive films from adhering to equipment.

· As conveyor belt: Made into conveyor belts for stable module transportation inside laminators. Its low surface friction ensures no module deviation, and it withstands continuous operation at 140–160°C.

· Uniform heat transfer medium: Balanced thermal conductivity allows gentle heat penetration from hot plates to encapsulant films, avoiding air bubbles or uneven cross-linking caused by local overheating.

· Air-venting structure: Some microporous Teflon cloths guide residual gas out of adhesive films under lamination pressure, reducing internal void defects.

· Dimensional stability: Minimal deformation under long-term thermal cycles ensures uniform lamination pressure distribution and prevents cell microcracks.

2. Soldering Process – Key Support in String Soldering and Stack Soldering

Teflon high-temperature cloth supports high-temperature solder bonding of solar cells:

· Conveyor belt material: Covered on stringer belts to prevent molten flux or solder splashes from sticking to equipment. Its smooth surface reduces micro-vibration and scratching during cell transfer.

· Soldering backing and positioning templates: Cut to specific shapes and placed under cells for stable support of accurate alignment between ribbons and busbars. Its thermal insulation maintains a stable soldering temperature window.

3. Auxiliary Curing and Testing Processes – Extended Applications

Beyond core processes, Teflon high-temperature cloth is also used for:

· Curing oven liners or separators: As tray liners during junction box potting adhesive curing to prevent overflow adhesive from sticking to curing equipment.

· High-temperature test protection: Used as an isolation layer between fixtures and samples in hot-spot testing or environmental aging experiments, avoiding thermal adhesion between module backsheets/frames and metal fixtures at high temperatures.

In summary, Teflon high-temperature cloth acts as a core process medium at key nodes including lamination, soldering and curing in the PV module production chain. Its stable performance directly affects module encapsulation yield and long-term reliability.

The above information is provided by Jiangsu Aokai New Materials Technology Co., Ltd.

For detailed parameters, application scenarios and customized solutions of our full product range – including Teflon high-temperature cloth, Teflon high-temperature tape, PTFE high-temperature mesh belts, seamless belts for bonding machines, single-sided PTFE cloth, high-temperature resistant conveyor belts and high-temperature fiberglass cloth – please contact us via:

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