By Martin Habekost
By Martin Habekost
For three days in March, some of the brightest technological minds in print gathered in New Mexico to discuss RFID, Ultra Violet, omni-marketing and colour management
The Technical Association of the Graphic Arts held its annual conference in Albuquerque, New Mexico, in late March. As is tradition, the conference, focusing on the newest technological developments in printing systems kicked off with four high-profile keynote speakers.
The first keynote came from Chris Travis of KBA North America. He talked about many advances still being made in press technology, with more sales of complex machines, combining different printing features and more automation. Presses are being ordered with double coaters for spot UV, spot matte and special effect coatings. Sometimes the coating units are before the printing units for laying white down first, to print on foils and for the application of sizing. The goal of all these various press configurations is to get everything done in one pass.
Travis also points out that the decision to print a job digitally or offset starts at a relatively low good-copy count. He says any job with more than 191 good print copies is more cost effective when the job is printed offset. UV technology is also changing, as the light tubes change from the standard mercury vapour to iron-doped mercury vapour light tubes. This little change results in higher gloss levels for UV coatings. The coating manufacturers have to adjust the phot0-initiator mix so it will work with the iron-doped UV light tubes and UV LED technology is gaining more of a foothold in the print industry. Travis also points out that flexographic printing is growing and holds the most potential in the print industry. The industry overall is finally growing again even as a lot of mergers and acquisitions take place.
The second keynote was given by Patrick Younk from Los Alamos National Lab, introducing conference attendees to some of their incredible work. Many fundamental research projects are carried out by this research institute. Younk talked about the High Altitude Water Cherenkov observatory for the detection of gamma rays originating from the sun. He also talked about an ultra-fast optical ranging measurement system. It is a non-contact position measurement system that works with a 1-micron accuracy and it could be used to measure ink film thickness or colour registration.
Michael Van Haren from Quad/Graphics presented the third keynote on omni-channel marketing. He began by describing the differences between multi-channel and omni-channel marketing. Omni-channel marketing is the same message on all media. Print of course is still the main driver of this. Why – because it works. It delivers the right message in the right place at the right time.
With the emergence of high-speed inkjet printing it is possible to personalize the message and with full colour inkjet the message to the consumer becomes very personalized. A highly targeted variable data print uses personalized URLs or PURLs. Through QR codes and image recognition apps, the printed piece has some augmented reality to it. For all this technology to work well, data is needed to drive the campaign. The contact strategy needs to be build with print being in sync with digital channels. Any digital tools that interact with the customer need to be tested over and over again to make sure they all work as intended.
The fourth keynote was given by Bruce Khan from Clemson University and his topic was printed electronics. He said that print is and will be the manufacturing method of choice in this area, because it is fast and produces the electronic components at a relatively low cost. Khan also says that false hopes had been given by nanotechnology and RFID technology. The most successful printed electronic component is the glucose sensor strip for diabetics. Many obstacles still need to be overcome to successfully print something like flexible hybrid electronics.
Colour and optical brighteners
On the second day of the TAGA conference, the series of presentations started with a diverse range of topics. John Anderson from Kodak talked about the Flexcel NX flexographic printing plate that allows the manufacturing of plates with flat top dots. The Flexcel NX plate is coupled with DigiCapNX technology to achieve higher solid ink densities than with conventional plate technology. This technology allows for creating halftones from a 0.4 to a 99.6 percent tint. Through Hyperflex NX technology, the floor of the flexographic printing plate gets extended to support low tint value halftone dots. This presentation was an example of the advances that are currently made in flexography that allow the printing of finer details and more vibrant solids.
Don Schroeder from Fujifilm was one of the first speakers to talk about the influence of optical brighteners in papers and that proofing papers have no or very little optical brighteners in them. This discrepancy causes colour differences between press sheet and proof, especially if the paper has a very blueish white colour. The new measurement conditions M1 as outlined in ISO 13655 requires a light source with UV component, so the optical brighteners in the paper get excited and influence the measurement of the printed colours. The standard datasets that many colour management solutions are built upon were created in 2006 and they have been measured under the M0 measurement conditions, which are without a UV component in the light source. The new dataset created in 2013 use measurements taken under the M1 conditions.
Many other presenters talked about the new M1 measurement conditions and how they will influence the printing industry, but there is a drawback to this new measurement condition. An extreme example is that two M1 compliant light sources can have 50 and 150 percent of UV component in them and this results in a b* difference of 7. This can be quite significant for the overall colour difference and can result in a pass or fail of a colour. In conjunction with ISO 13655, for the measurement conditions of light booths, ISO 3664 has also been updated, so that the light source in the viewing booths also has a UV component in them. The compliance of a viewing booth with this updated ISO standard can be verified with a measurement device from GL Optics. Overall there were six presentations about the new M1 measurement condition and how it influences measured colours, the proofing stage and also the colour management part of any print job.
Although the DE2000 colour difference equation is not (yet) part of an ISO standard, work is being done to develop a colour space that is based on DE2000. John Seymour from QuadTech presented his advances in this project. His goal is to create a colour space with modified L*a*b*-axis that allow for the use the DeltaLab colour difference formula.
A presentation was given on the strategies of managing spot colours using traditional metrics and how to predict the colour outcome using simulated colours on screen. Research is also being done regarding working with expanded gamut printing using 7 colours (CMYK plus orange, green and violet). The use GCR and optimized colour sequence (KOVCGMY) are instrumental to more stable and predictable print results.
Raia Slivniak-Zorin from HP in Israel talked about the work she and her team did with regard to digitally printed flexible packaging. The work was done on an HP Indigo and the prints were also laminated. One of her main findings is that a primer needs to applied to the flexible substrate first, so the ElectroInk will adhere properly. Also an adhesive has to be applied first, before the printed material can be laminated. A corona treatment of the substrate greatly enhances the bonding of primer and ink.
The 2015 TAGA conference was a very high profile conference with many cutting-edge research presentations that will have an influence on the print industry in the coming years. The fact that the M1 measurement condition received so much attention during the conference shows that the new ISO standard requires more investigation.