Closed loop ink thickness control system with reduced substrate waste in a printing press

摘要

A method is provided of charging an inker in a lithographic printing press. The method comprises placing all of the printing units of the printing press in an off impression position, with a continuous substrate passing through the printing units, each printing unit including a blanket cylinder; and in one or more printing units of the plurality of printing units, moving the takeaway roller into contact with the blanket cylinder of the printing unit. Thereafter, the method includes driving the ink train, plate cylinder, blanket cylinder and the take away roller at a first surface speed, whereby the ink from the ink train transmitted to the plate cylinder from the ink train, from the plate cylinder to the blanket cylinder, and from the blanket cylinder to the take away roller; and during said driving step, keeping the continuous substrate stationary or moving the continuous substrate at a second surface speed less than 50% of the first surface speed. Also provided is a closed loop control system for controlling the ink film thickness applied to a printed substrate in a lithographic printing press.

主权项

1. A method of charging an inker in a lithographic printing press including a plurality of printing units, each printing unit including a blanket cylinder, a plate cylinder, a take away roller, and an ink train, comprising:
placing all of the printing units of the printing press in an off impression position, with a continuous substrate extending through the printing units; thereafter, in one or more printing units of the plurality of printing units, moving the takeaway roller into contact with the blanket cylinder of the printing unit; thereafter, driving the ink train, plate cylinder, blanket cylinder and the take away roller at a first surface speed, whereby ink from the ink train transmitted to the plate cylinder from the ink train, from the plate cylinder to the blanket cylinder, and from the blanket cylinder to the take away roller is removed; and during said driving step, keeping the continuous substrate stationary.