| 摘要 |
PURPOSE:To enable a title device to stably used even in the air or under a high temperature by forming it with a polyimide film, thereby manufacturing it at a low cost and easily. CONSTITUTION:A solar selective absorption film which applies to a hot-water supply system for home use effectively utilizing the solar energy, a generator or the like is made of a heat-treated polyimide film. That is, if the surface of a metallic base material 1 is coated with a polyimide film 2, the polyimide film 2 absorbs the visible rays of the sunlight and also acts as a film transparent to the infraed rays. And it exhibits a low radiation rate to the infraed rays because the substrate 1 is a metal, and acts as a solar selective absorption film. With this, it is stable even in the air and at a high temperature, whereby the solar selective absorption performance can be remarkably improved and the manufacture thereof is also easy. |
