| 摘要 |
An encapsulation film and photovoltaic module using the same are provided, being excellent in long-term reliability and wherein the degradation of gas-barrier property over long-term use (a problem in the conventional art) is curtailed. The film has as a base material an inexpensive polyester film that is excellent in mechanical characteristics and processability. Furthermore, the encapsulation film and photovoltaic module using the same are hydrolysis-resistant, transparent, weather-resistant, and lightweight. The encapsulation film comprises: a polyester film having a thermal shrinkage ratio of (± 2) % at 150 °C in both the length-wise and width-wise directions, and additionally, wherein the difference between the thermal shrinkage ratios in the length-wise and width-wise directions at 150 °C is 2 % or less; and a layer composed of at least one member selected from the group consisting of metals, metal oxides, and inorganic compounds. The photovoltaic module uses the encapsulation film as a front sheet layer and/or a back sheet layer thereof. |
