Dayton, Ohio, evokes images of innovation. From the Wright Brother’s bike shop to Wright-Patterson Air Force Base, the city has a rich tradition of technical excellence. In graphic arts circles, the city is known for its paper and inkjet roots.
Kodak Versamark got its continuous inkjet start in 1972, when it was known as Mead Digital Systems. Since then, the company has come full circle: Eastman Kodak bought the company, which then was called Diconix, as a wholly owned subsidiary in 1983. Kodak then sold the technology capability to Scitex in 1993. And in 2004, Eastman Kodak acquired the assets of Scitex Digital.
Still with me? Good! John Parsons, former editorial director for The Seybold Report, recently attended a briefing on Kodak’s inkjet activities. Here’s his report.
Kodak Prepares to Launch the Stream-Based Prosper Inkjet Press at Ipex 2010
By John Parsons
Dayton, Ohio — The production inkjet field is getting interesting. Kodak has begun briefing analysts on its new Prosper Press line — first introduced at drupa as the Stream Concept Press. (See “Kodak Showcases Stream Inkjet Technology,” American Printer, May 27, 2008.) The company is planning a public launch at Ipex in May, and the first installations will commence in early 2010. (Consolidated Graphics officially signed the first contract for the 4-color perfecting model on December 9.) While publicity for HP’s T300 press has arguably been more daring, Kodak is upping the ante with a serious contender.
The Kodak Prosper press promises high speed digital four-color output on commercially available paper.
The Prosper line is based on Kodak’s Stream technology, developed primarily in the Dayton facility and the Kodak Research Labs, but separate from the existing Versamark VL line. It represents a new approach to inkjet imaging and a major gamble in an already distressed printing industry. If successful, it will bring inkjet digital printing — and its potential for variable data output and shorter, more cost-effective press runs — closer to the overall visual quality of offset production.
Live Long and Prosper
The Prosper line actually already began this year, with the Prosper S10 Imprinting System, which was commercialized in June. Used in-line on a conventional press, the 4.16″ units provide 600dpi black variable data imprinting on a variety of coated and uncoated stocks, at speeds up to 1,000 feet per minute. The list price is $475,000 for a two-headed system with a controller and data station, the jetting modules demonstrate Kodak’s walk-before-you-run strategy with its new Stream approach. Direct mail printers in particular have shown interest in the S10, which enables higher-quality variable imprinting without the need for a two-step process of pre-printing offset shells and off-line imprinting.
The first actual press will be installed in Q1 2010, as part of the buildup to Ipex. The 24.5″ (620 mm) print width Prosper 1000 is a 600dpi, black-only perfecting press, printing up to 3,600 A4 images per minute at the equivalent of 100-133lpi, and a duty cycle of 120 million A4 impressions per month, assuming 24/7 operations at 80% uptime. Kodak has worked out in-line finishing system integrations with Muller Martini, Hunkeler and Lasermax, with others purportedly in the works.
The Prosper 1000 is aimed at the book printing market, for shorter runs of up to 7,000 copies. The variable data angle is somewhat moot for book publishers, although the potential for teacher’s editions and versioning in the education market is attractive. Overall print quality is comparable to offset, and the ability to print on a variety of commercial papers is a plus. In the book printing workflow presented by Kodak, the process of adding separately printed color covers was a manual one, but the overall system is still attractive for short-run trade and educational book printing.
The Prosper 1000 — and indeed the entire Prosper line — is field upgradeable and highly modular, according to Kodak. The 1000 can be upgraded to color, for example, by inserting and configuring new heads and modules. When we viewed (but were not allowed to photograph) the first devices being assembled, the compact, modular press units appeared to be easily movable and compatible with a broad range of shop floor challenges.
The first full-color Prosper 5000XL perfecting press will be installed in the first half of 2010 — presumably at a Consolidated Graphics shop. Like its monochrome cousin, the 5000XL has a print width of 24.5″ (620 mm) on a 25.5″ wide web, with speeds approaching 1,000 feet per minute. The image equivalent for the color press is 133-175 lines per inch. Individual color jetting modules are followed by their own separate in-line drying units, contrasted with systems that only have a final drying unit after all four colors have printed. Kodak maintains that this reduces printing problems due to excessive moisture content, thereby improving image quality, color gamut and color fidelity. Interestingly, ink drying is highly customized, based on paper type and ink coverage. Special profiles manage the dryer temperatures throughout the run.
The Prosper press alternates jetting and drying units, avoiding excessive moisture buildup. Special “dryer profiles” are used to regulate temperatures according to paper type and ink coverage. In-line spectrophotometers analyze image quality during the press run.
To support full data variability and versioning at such high speeds, the Prosper requires an imposing digital controller system, the Kodak 700 Print Manager. Version 1.0 supports the usual array of static file formats such as PDF and PostScript, as well as variable data formats like PPML/GA, PPML/VDX, VPS and optimized output from InSite, Darwin and some third-party applications. Version 2.0 will add support for Intelligent Print Data Stream (IPDS), and 2.1 will add support for Xerox VIPP and ASP. A new version of Prinergy (dubbed “Prinergy Digital”) has added some unique analysis and logic approaches for creating more effective variable data campaigns.
The 5000XL will print stochastic color images, comparable to 175lpi output on glossy stock, according to Kodak. On coated glossy paper, the press’ color gamut is purportedly equal to or greater than that of SWOP or GRACoL, and was reported to be 34% larger than the European Fogra39 color space. The device will include on-board spectropho¬tome¬ters to help with color management and control. One reason for the large potential color gamut was the formulation of Prosper’s nano-particulate ink — which Kodak claims increases color saturation and requires less overall ink usage.
Samples we viewed had some minor but noticeable color variation from their offset counterparts — particularly in the reds and purples — but we could not tell if this variation was related to software, hardware or consumables. Despite these undoubtedly solvable issues, the Prosper’s color quality will impress many customers accustomed to offset work.
Pricing, Maintenance and Target Markets
The capital investment for a Prosper press ranges from $1.4 million to $4.0 million, depending on color capability and including the Digital Front End (DFE) — but not third party in-line finishing. A range of commercially available papers can be used (see sidebar) and the ink must be purchased from Kodak. A supply of replacement jetting modules is included.
The company claims that the average cost of producing an A4-size CMYK page (35% coverage) will be $0.008, while the average cost of producing an A4-size monochrome page (5% coverage) will be $0.0015. Before embracing these estimates, however, potential buyers should discover the impact of maintenance/service charges, energy usage and other factors that may be different from those of offset operations.
Kodak stressed the relatively low number of jetting modules per color (6) and the ease with which the modules can be replaced. Prosper customers will be supplied with additional jetting modules for replacement — which takes about one minute, plus an additional five minutes to bring the press fully back online.
Prosper is intended for several markets, including short-run books (50-7,000 copies), variable direct mail (16,500-26,000 signatures/hour) and catalogs and inserts (50-3,000 versioned copies at 19,500-23,000 signatures/hour). Kodak’s “Market Pioneer” customers in these markets include education and trade book printer Webcrafters in Madison WI, and Consolidated.
The 2010 Picture
As Kodak rolls out the Prosper line, comparisons with HP’s press will become more intense. The T300 boasts a wider 30″ web and resolution of 1200 x 600 dpi) but its maximum speed — 400 feet per minute — is less than that of Prosper. Evaluations of the two devices’ color quality and consistency, especially compared to offset, will have to wait until there has been some impartial testing.
Kodak will make considerable noise about printability on commercially available coated stock, although we expect HP to counter with its undercoating process, plus the argument that the Prosper does in fact require coated paper to be specially treated — either at the mill or by an in-line module.
The real question for the print community is whether to compare the T300 with Prosper or with existing inkjet presses, such as the Versamark VL and other piezoelectric DOD devices. The T300 is in fact based on DOD technology, which Kodak insists is a limiting factor while HP clearly believes otherwise.
Quality, productivity and pricing issues are only the tip of the iceberg for inkjet presses. The ideal medium of such presses is variable data printing, versioning and extremely short runs — preferably strung together, and with minimal makeready. To handle such work profitably on a fast web press, the automated workflow must be capable of keeping the pipeline full, and handling a multitude of small details with extreme accuracy — both before and after the actual printing happens. Above all, each printer’s sales force must learn how to design and sell complex, automatable projects — as opposed to individual print jobs — if they hope to become manufacturing supply chain players. Hardware, no matter how attractive, is only one aspect of a far larger challenge.
Don’t Cross the Stream
According to Kodak, Stream (the underlying technology for the Prosper press) is a wholly new approach to non-impact digital printing. It is not a Drop-On-Demand (DOD) approach, nor is it a conventional Continuous Inkjet (CIJ) process. DOD produces a pattern of ink droplets via a vibrating crystal or other electronic “gating” element for each inkjet nozzle. Although Kodak uses DOD in its existing Versamark line, the company holds that DOD has inherent speed and usability limitations for “offset-comparable” inkjet production.
Stream uses a miniscule thermal pulse to change the surface tension of the ink, causing it to break up into large and small droplets — the latter being blown into a recycling path by an air current.
Prosper is in fact a CIJ approach — but with significant differences. The ink droplets are not electrically charged, or separated magnetically. (This conventional approach, Kodak maintains, is naturally subject to electrical shorting and other limitations.) Instead, each stream of ink is subjected to miniscule heat pulses (measured in nanojoules — billionths of a joule), which changes the fluid’s surface tension and divides the stream into large or small droplets. A steady air current pushes the smaller, lighter droplets aside — into a recycling path — so only the larger, heavier droplets reach the paper. (See diagram.) There are few moving parts, potentially more nozzles per array and, Kodak maintains, lower inkjet head failure rates. There are also fewer inkjet heads to deal with: only 48 in the 24.5″ 4-color perfecting press.
The Paper Chase
Another major difference between Stream and DOD is the former’s ability to print on commercially available coated stocks. Because DOD inks contain more wetting agents — to prevent clogging in the print heads — it is extremely difficult to apply them to non-porous stock, such as matte-, gloss-coated or supercalendared paper. Stream ink contains only trace amounts of wetting agents, as well as finer pigment particles. In combination with Interstation dryers, Stream inks purportedly offer improved drying with better adhesion characteristics to coated papers. Non-porous papers still must be roll-coated at the mill, although Kodak maintains that the treatment does not visually alter the paper and is affordable. The company has negotiated with major paper companies to provide ample supplies of roughly 24 common stocks for Prosper use in 2010. In 2011, Kodak will introduce an in-line roll-coating station for treating a wider range of papers not treated at the mill.
All in all, Stream technology appears to be a major break from traditional inkjet thinking. With fewer moving parts and a simpler architecture, it is arguably more scalable and practical for high-speed output than DOD or conventional CIJ. In theory, it could eventually erode a significant portion of offset’s market share — beginning with short-to-medium-run work. What it means for other digital print approaches, including NexPress and other toner devices, will depend on whether Kodak can deliver on Stream’s quality and speed claims.