| 摘要 |
PURPOSE: A back sheet is provided to improve the life time of a product by improving the blocking rate of ultraviolet rays. CONSTITUTION: A polyester film includes a contraction rate about zero point four percent when the polyester film is stored at one hundred fifty Celsius degree during thirty minutes. The polyester film is integrated with a PVF(Poly Vinyl Fluoride) film. The PVF film is not changed from minus seventy Celsius degree to one hundred seventy Celsius degree. Corona treatment is executed on the surface of each attached surface in order to improve adhesive power. Ultra adhesive is sprayed between materials. The materials are pressured. |
