| 摘要 |
The invention relates to an embossing process for the production of a film based on partially acetalized polyvinyl alcohol. The film is embossed on one side with a roughnesses, R<SUB>z</SUB>, of 20 to 80 sum by embossing the side 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.
|
