NEWSPAPER PRESSES -- Pressing Issues
The QuadStack is a low profile, single-width, single-circumference printing unit with a vertical web lead. The four-over-four-color device features bearers on all blanket cylinders, a helical cut gear train with oil bath, drop-down ink fountains, brush dampening, and running circumferential, sidelay and skewing adjustments on all plate cylinders. The units are said to not require register or fan-out controls in stacked (up to four high) configurations.
The QuadraColor four-over-one printing unit features independent shaftless drives and a common impression cylinder in a compact (5x8 foot) footprint. The unit's design is said to eliminate the need for register controls and provides running circumferential, sidelay and skewing adjustments on all plate cylinders. A plate cylinder registration pin reportedly provides quick plate changes and registration. Brush dampening is standard.
Moreland, of Dauphin Graphic Machines, says he is seeing a trend toward one-around, single-width, four-high presses in large configurations. "That approach provides the best quality four-color printing with great flexibility in color placement," he explains. "That configuration offers uneven sections and lends itself to the use of multiple folders."
Such large presses require automated features to keep down labor costs, and reduce makeready times and waste, Moreland says. He cites ink key presetting and cylinder positioning for chosen web leads as good examples of this trend.
New to the Market
Dauphin's latest market entry is the DGM 440 press that runs at 40,000 iph. It is designed with an oil lubrication system on the operator and drive side of the printing units, with a large base that holds the excess oil reservoir and has a built-in oil cooling system. The single-width machine is offered in cutoffs from 211⁄2" to 223⁄4".
The DGM 440 features drop-down ink fountains with calibrated lever keys, continuous dampeners with press speed tracking, slot-gap plate lockup with center register pin, and motorized running circumferential and sidelay register adjustment. It has a commercial inker with three oscillators and ink forms that are pneumatically controlled. Units also are available in shaftless (DGM 440S) and heatset (DGM 440H) designs.