| 摘要 |
<p>A rigid polycarbonate sheet for use as an outdoor building material is formed of a layer of foamed polycarbonate (12) and a co-extruded skin layer of UV protective polycarbonate (14). A system for the production of such a polycarbonate sheet includes an extruder, a co-extruder, an extrusion die, and a thermoformer.</p> |
