| 摘要 |
<p>Fibre webs are consolidated and embossed using pairs of rotating calender rolls between which the fibre web passes. The calender rolls have been provided with raised discrete areas which form a surface pattern and determine the pattern which is embossed on the fibre web. To emboss different patterns, depending on the desired constitution and stiffness of the fibre web, different calender rolls are available, but it is very inconvenient to interchange the calender rolls. To avoid this disadvantage, the calender rolls of the novel apparatus are each driven at a synchronous speed and it is made possible to alter the speed of one of the rolls for a short time, so that the surface patterns of the two calender rolls become displaced relative to one another. This creates different degrees of overlap between mutually opposite pairs of raised areas, so that it is possible to set different embossing patterns in the course of continuous operation without it being necessary to replace the calender rolls. <IMAGE></p> |
