| 摘要 |
<p>A composite plastic panel welded by ultrasonic comprises a plastic surface plate and a plastic bottom plate, which are molded by extruding directly or suctioning after extruding, and an injection piece, which is molded by injecting directly or composed of many injection pieces. Several protruding strips or points, which can be melt by ultrasonic, are formed at the contact parts of the injection piece and the inner surfaces of the plastic surface plate and plastic bottom plate. The composite panel is formed by ultrasonic.</p> |
