Closed-loop control of untensioned product length on a web press

摘要

A system and method is provided for closed loop control of an untensioned product length of a web moving through a printing press under tension during production. While a printing press is printing on the web, a controller receives a calculated untensioned product length L o (t) of the web in the span of the printing press while the web is moving through the printing press under tension, compares L 0 (t) to a previously stored untensioned product length setpoint L setpoint , maintains closed loop control of the untensioned product length by controlling one or more components on the printing press as a function of said comparing step, and repeats the steps receiving, comparing, maintaining and controlling over time while the printing press is printing on the web.