Think Ahead, Treat it Right

So, what can be done to avoid complications associated with web tension? “Consider nip rolls when running at speeds greater than 1,000 fpm, as this will eliminate concerns associated with developing an air boundary layer between the ground roll and the web,” Hablewitz says. “Also, in some cases spreader rolls/crowned rolls are used to eliminate wrinkles.” Gilbertson also suggests using nip rolls, as well as a driven or spreader roll for high-speed applications, to help control the web as it passes through the treater. “And of course, although you never want to hear this, slowing down the line will minimize your web handling problems,” he says.