Why Different Chambers of Solar Module Laminator Have Different Impact on The Usage Life of Silicone Rubber Membranes

In the solar panel manufacturing process, silicone rubber membranes are critical components within solar module laminators. These membranes are used to apply uniform pressure and heat over the module during lamination, ensuring air removal and proper bonding of layers like EVA, glass, and backsheet. However, within a multi-chamber laminator—typically composed of a heating (pre-lamination) chamber and a vacuum (main lamination) chamber—the conditions differ significantly. As a result, each chamber affects the usage life of silicone membranes in distinct ways.

1. Temperature and Thermal Stress Differences

The main chamber operates under higher temperatures (usually between 140–160°C) and prolonged pressure to fully cure the EVA and bond all module layers. Silicone membranes in this chamber are subjected to continuous thermal cycling, which can gradually degrade the silicone’s physical properties, such as elasticity and tensile strength. Over time, this leads to cracking, hardening, or surface damage.

In contrast, the pre-lamination chamber often runs at a lower temperature and with shorter exposure times, placing less thermal stress on the silicone membrane. Therefore, membranes in the first chamber tend to have a longer operational life.

2. Exposure to EVA Outgassing

During EVA lamination, chemical outgassing occurs. Gases and byproducts from the melting EVA can be absorbed or deposited on the membrane surface, especially in the vacuum chamber. These residues may stick to or corrode the membrane, reducing its flexibility and creating areas of poor pressure application. The vacuum chamber membrane is more exposed to these harsh conditions, which shortens its lifespan.

3. Mechanical Load and Compression Cycles

In the main chamber, the silicone membrane experiences higher compression forces and repeated deformation over each lamination cycle. This continuous stress causes material fatigue, especially in areas directly above the module edges. The membrane must flex, stretch, and seal tightly every cycle, which increases wear compared to the relatively stable conditions in the preheating chamber.

Conclusion

The difference in temperature, chemical exposure, and mechanical stress between chambers in a solar module laminator directly influences the usage life of silicone rubber membranes. Proper maintenance and rotating membrane positions can help optimize durability and reduce replacement costs.