Gravure Publication Presses

Gravure publication presses are engineered for high-speed production of superior quality color publications. These systems are commonly used to print magazines, Sunday newspaper magazines, catalogs, newspaper inserts, and various advertising materials.

Key product requirements for publication gravure include:

• Multiple printed sheets must be folded and assembled into complete publications directly on the press, or delivered as folded signatures to the bindery.

• Variable cutoffs.

• High-speed production capabilities.

• Versatile in-line finishing options.

• Consistent color reproduction across the entire press run.

• Adaptability to lower cost substrates.

• Reduced start-up and running waste.

The vast majority of U.S. publication gravure presses feature either 8 or 10 print units. Newer gravure presses typically operate with web widths ranging from 96 to 108 inches, while most existing presses range from 70 to 92 inches in width. A single press can produce from one to six different products, with signature pagination ranging from 8 to 128 pages.

Given their width and operational speed, gravure publication plants consume enormous quantities of paper. This necessitates sophisticated materials handling technology and highly automated systems for loading paper rolls and splicing new rolls to expiring ones during high-speed operation.

Characteristics of Publication Presses. Modern gravure publication presses are generally equipped with a single unwinder for eight printing units. The adoption of wider webs has led printers to run only one web per press, utilizing larger diameter paper rolls to minimize changeovers and associated waste.

Paper rolls are transported to the unwinder, typically through automatic or motorized systems.

Publication press unwinders incorporate automatic controls for roll changeover.

Web preconditioning units, consisting of either hot air chambers or heated drums, prepare the paper to optimal temperature and moisture conditions before printing.

Reversible printing units feature two doctor blade groups, enabling printing of webs traveling both left to right and right to left. The doctor blade is typically locked in a holder that may be integral to the press structure.

Many publication gravure presses employ a cloth-covered pre-wipe roller in the ink fountain to enhance ink application to the print cylinder. On presses with variable cylinder sizes, the depth of cylinder immersion in the ink fountain is adjustable.

For wide web presses, the impression roller incorporates deflection compensation technology. This system applies force not only at the journal ends but also at intermediate positions along the roller length, ensuring uniform pressure across the entire web. A printing unit for a publication gravure press, featuring auto loading of the print cylinder, is shown in Figure 4-2.

Electrostatic Assist systems enhance ink transfer from the cylinder engraving to the web by charging either the web, the rubber, or the side of the impression roller, thereby attracting ink electrostatically to the substrate.

Wide web presses are generally equipped with rehumidifying systems, such as steam bars, to increase paper moisture levels when shrinkage occurs.

Publication gravure presses integrate with numerous complex slitting, folding, and finishing machines. These in-line operations include:

• Folding

• Stitching

• Auto stacking

• Inserting cards and coupons

• Gluing

• Perforating

• Flexo imprinting

• Letterpress imprinting

• Coating

• Trimming

• Rewinding

Sustainability remains a key driver, with ongoing developments in energy-efficient press operation and substrate recycling. The industry maintains its focus on combining high-volume production with consistent print quality.