| 摘要 |
<p>The invention relates to a sheet of plastic material. According to the invention, the surface of at least one of its sides (101) has a miniature corrugation or micro-corrugation (2, 3). A further object of the invention is a process for the manufacture of the said sheet (1) by means of a pair of rolling cylinders (4, 5) with completely smooth rolling surfaces, in which the first rolling cylinder (4), on the side of the sheet (1) which is to be provided with the micro-corrugation (2, 3), known as the rolling and corrugating cylinder, is driven at a speed slightly greater than that of the opposing second rolling cylinder (4). For the application of the said process, the invention proposes a device comprising at least two rolling cylinders (4, 5) with completely smooth rolling surfaces, each being driven independently of the other by separate drive units (M4, M5) provided with means (304, 305) of continuous, independent regulation of the speed of rotation of the cylinders, on the basis of and with means (305) of controlling the ratio of the said speeds. <IMAGE></p> |
