Perfecting: One Pass, Two Sides

To most people, perfecting means making something flawless or improving it until no faults remain. A musician perfects a sonata through practice; a student perfects an essay through revision. The word carries a sense of refinement over time, of getting closer to an ideal.

In industrial printing, perfecting means something entirely different and far more mechanical. It refers to the process of printing the reverse side of a sheet during the same pass through the press that prints the front. A perfecting press has two printing stations arranged so that paper moves through continuously, receiving an impression on one side, then flipping and receiving an impression on the other side, all without being removed from the machine. When the sheet exits the press, both sides are printed and the job is complete.

This is a pure efficiency gain. A conventional press would require the operator to feed the paper once to print side one, then remove it, let the ink dry, reload it, and run it through again to print side two. A perfecting press does both operations in one continuous feed, cutting production time roughly in half for two-sided work. The term comes from the verb perfect, used in printing from at least the 18th century to mean completing a print run on both sides of a sheet.

The word appears nowhere else in trade terminology with quite this meaning. Bookbinders and finishing trades use perfecting in the ordinary sense. But in the printing floor, if a press is called a perfecting press, everyone understands that both sides will be handled in one pass, which is why the press can be called perfect: it completes the task in one operation.