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Presentations 2015, 2016

iarigai Toronto 2016
iarigai, VIGC, IS&T at drupa 2016

iarigai VIGC, Brussels
Evolutions in food packaging printing

You are here: Conferences & Events * 2010 Montreal * Abstracts * 2. Improving print quality

2. Improving print quality

2.07 Overprinting of Spot Colors for Flexo Packaging

A. Pekarovicova, V. Lovell , S. L. Sangmule, P. D Fleming III  and T. Pietrack

Abstract
The correctness of the overprint models included in several different pre-press proofing applications based on the digitally generated color design was evaluated. Color proofs were compared to the real ink on paper reproduction from a flexo printing press. The substrate used in the press run was SBS board. The CIE L*a*b* values of printed test charts were measured using MeasureTool software with an X-Rite i1-iO scanning spectrophotometer.  The spot colors were proofed on a semi-matte substrate printed from two different Epson Stylus Pro printers, using different prepress and color management software:  SmartColourTM iVue plugin, Adobe Photoshop, and two different technology based RIP solutions. CIE L*a*b* values for the press and digital printed test chart were compared and ΔE values were calculated, which showed that the proofing of the spot colors and its reproduction through SmartColourTM iVue and one of the RIP software produced better results than the other technology based RIP and Adobe Photoshop. The 3-color overprints yield the worst color agreement between the real press proof and the predicted overprint on the digital proof. UV curable spot color inks were found to have better color stability than solvent based ones, and were found easier to work with. Digital proofing of both ink chemistries resulted in similar results in terms of ∆E values.

Keywords: spot colors, flexography, solvent based, UV curable ink, digital proofing
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2.08 High speed UV inkjet - impact of speed and substrates on print quality

Marianne Klaman, Per-Åke Johansson, Jon Lofthus, Erik Blohm , Ingo Reinhold

Abstract
Up to very recently, high speed inkjet meant high speed but low print quality. The trend today is that a new generation of high speed inkjet printing heads/presses, able to produce higher quality, begins to appear.  It is therefore of increased interest to evaluate what impact the speed has on the final print quality due to the interactions between print head, ink and the substrate. Also what effect different substrates have on the print quality.

The results here presented emanate from a project concerning high quality inkjet at higher speeds, performed at Innventia together with industrial partners. The work has been carried out in cooperation with the printhead manufacturer Xaar, as well as paper and ink producers.

The inkjet research platform has been integrated into a universally useful reel-to-reel machine for the dynamic evaluation of paper and other substrate’s mechanical as well as printability properties at the institute. The set-up is described as well as the chosen inkjet technology.

Results from the print trials are presented and measures for print density, gloss, print mottle and dot shape are given. Ink penetration on different paper grades and UV curing efficiency are analysed as well.

Keywords: high speed inkjet printing, impact of speed on print quality, impact of substrates on print quality, UV curing.
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2.09 Influence of atmospheric plasma treatment on surface properties and inkjet printability of plastic packaging film

Johanna Lahti, Kim Eiroma, Tiia-Maria Tenhunen, Maiju Pykönen and Martti Toivakka

Abstract
Plastic films are used in various flexible packages, such as wrappings, pouches and bags. In packages, the most important function of a packaging material is to shield the product inside the package. Plastic films give a barrier against water, water vapor, aroma, grease, oxygen, etc. In addition to barrier properties, printability is an important property in packaging applications, and especially in labels. In inkjet printing, the controlled spreading of the low viscosity ink on the substrate is essential for satisfactory print quality. This requires suitable absorption properties and controlled surface chemistry. From the point of view of printing, the dense and impervious structure of plastic film is challenging: printing inks do not penetrate into the substrate. When polymer surfaces, like plastic films, are printed, adhesion of the printing ink is essential. Durability of the printed image is important, because the image must withstand various converting operations when the package is constructed. Also the end-use of the material (label or package) requires both durability and high visual print quality.

Surface treatments are used in order to produce special functional groups at the surface for special interactions with other functional groups and to increase the surface energy. The objective in this study was to compare traditional corona treatment to a novel roll-to-roll atmospheric plasma treatment (APT). The APT process offers unique advantages over existing technologies for surface treatment such as corona including more uniform and longer lasting treatment. Plasma treatment activates the surfaces without affecting the reverse sides of the substrates. Plasma also allows tailored surface activation by using different process gases, like helium and argon. Furthermore, the aim was to evaluate the effect of surface treatments on the surface properties and inkjet printability of polypropylene (PP) film.

Keywords: atmospheric plasma treatment, corona treatment, inkjet printing, packaging, plastic film
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