The moving gear is used to position

The moving gear is used to position the calender underneath the die readyfor operation. The height adjustment unit is used to bring the completecalender to the desired working height. The individual roll positions relative to each other may be set hydraulically for the appropriate workingmode.The extrusion melt now enters roll gap 1. This roll gap is set to the requiredgap and can be opened and closed hydraulically. All three roll units areeach driven by a motor, with roll 2 determining the master speed. Thespeed of all other rolls and parts of the machine is set proportional to themaster roll speed.The extrudate is drawn into the roll gap by the driven rolls. It is pressed tothe set gap thickness and the highly polished rolls give it the appropriatesurface finish.As the pressed melt panel passes around the entire wrapping surface ofroll 2 it is heated as appropriate for the type of process. The temperatureof the roll surface is thus transferred to the melt panel. The temperature ofthe roll surface is held constant via heating- and cooling device.When running through roll gap 2, the melt panel receives its final form andthickness, whereby a negligible shrinking occurs during further cooling.The panel is again appropriately tempered on the surface of roll 3 andthen leaves the calender.