| 摘要 |
<p>The invention relates to a two-stage process for the production of a structured film based on partially acetalized polyvinyl alcohol with roughnesses of the surfaces, independently in each case, of Rz=20 to 80 mum by embossing the sides of the film between correspondingly roughened embossing rollers and pressing rollers with a certain Shore A hardness. The temperature of the film and the rollers is adjusted in order to fix the structure.</p> |
