https://www.contitech.de/mediaservice/suche.aspx is a good place to start finding out.

This is a very good question. I think the carcass tension on exit from the press would be very low and the tension on the entry side would be that imparted to the workpiece as it is drawn through the plattens without slip. If the tension is too high the belt would distort on cooling and if too low the rubber would do some start up work all on it's own.

Belt manufacture is fascinating, some people need carcass elements just to induce preload during cooling, which in turn helps to maintain a particular profile. You have to talk to the experts: they're always helpful. ■