Rotary Press

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rotary press

[′rōd·ə·rē ′pres]
(graphic arts)
A press utilizing two cylinders, one of which supports the paper while the other one prints on it; large rotary presses are web-fed and accept continuous strips of paper from large rolls; this web of paper is not cut or trimmed until after it is printed.

Rotary Press

 

a printing press whose impression and printing surfaces are cylindrical. Rotary presses are subdivided into sheet-fed and web-fed presses. The primary types are classified as follows: (1) by the printing method (letterpress, piano-graphic, and gravure); (2) by the number of colors applied at one time (one-, two-, and four-color presses); and (3) by the number of sides of the page printed (single-side and double-side printers).

Web-fed rotary presses may have a constant or variable format. In constant-format web-fed rotary presses, the length of the sheets cut off from the web is invariable and equal to part or all of the circumference of the impression cylinder. In variable-format web-fed presses, which are used for printing special items, such as forms, tickets, and bank documents, the length of the printed sheet can be varied. Rotary presses are the primary equipment used for medium- and large-scale printing jobs.

Sheet-fed rotary presses operate at speeds up to 10,000–12,000 cycles per hour; speeds for web-fed machines may reach 30,000 cycles per hour.

B. A. KUZ‘MIN

References in periodicals archive ?
The literature describes injection solutions, closing units, G8 automatic process control, modular and upgradable presses, and special Sacomat presses, including injection presses, rotary presses and vacuum compression presses.
Tenders are invited for for the replacement of the existing sludge dewatering equipment with new rotary presses and two new mccs, installation of pug mills, a polymer feed system, operator room, and all necessary piping and appurtenance.
MOR, which stands for Metallic Overprint Rotary, provides "excellent performance for high speed applications on rotary presses on a variety of paper substrates," he says.
Unfortunately, small label printers with their locally built rotary presses, flatbed presses and Chinese built cheap presses, bring intense competition to this sector, aggravated by the fact that they use stock lots and reject materials flooding the market.
Injection systems are described, along with closing units, automatic process control, modular and upgradable vertical and horizontal presses, Sacomat injection and rotary presses, vacuum compression presses and specialty presses.
Two rotary presses, a six and a seven color, round out the arsenal.
Flatbed and rotary presses: Label Traxx 5.2 now accommodates rotary press stations and flatbed diecutters, in addition to the narrow web machines used by most users.
The press can therefore compete with rotary presses, with the advantage of not being size-dependent.
The VIVA 420 allows high productivity for the label industry with 16-inch width and speeds up to 200 feet per minute, and can therefore compete with rotary presses, with the advantage of not being size-dependent.