June–July 2017

A letter from the Editor

Gorazd Golob

Editor-in-Chief

E-mail: gorazd.golob@jpmtr.org/journal@iarigai.org

This year’s second issue of the journal is ahead of us. Despite the delay in publishing and a small volume of articles, I would like to post the important news. Since this year, the journal is indexed also at Clarivate Analytics. In July, we received an Acceptance letter informing us that the Journal has been selected for coverage in Clarivate Analytics products and services. The Journal is now indexed and abstracted in the Emerging Sources Citation Index (ESCI). ESCI complements the highly selective indexes by providing earlier visibility for the sources under evaluation as part of the Science Citation Index Expanded (SCIE), the Social Sciences Citation Index® (SSCI), and the Arts & Humanities Citation Index® (AHCI).

In 2017, Clarivate Analytics was launching ESCI, which will extend the number of journals and other publications in Web of Science to include high-quality, peer-reviewed publications of regional importance and in emerging scientific fields. ESCI will also make content important to funders, key opinion leaders, and evaluators visible in Web of Science Core Collection even if it has not yet demonstrated citation impact on an international audience. Inclusion in ESCI provides more discoverability which leads to measurable citations and more transparency in the selection process.

The Journal of Print and Media Technology Research, like other journals in ESCI, have passed an initial editorial evalua- tion and can continue to be considered for inclusion in products such as SCIE, SSCI, and AHCI, which have rigorous eval- uation processes and selection criteria. All ESCI journals are indexed according to the same data standards, including cover-to-cover indexing, cited reference indexing, subject category assignment, and indexing all authors and addresses.

The classification in ESCI has proven the correctness of the decision of the Board of iarigai to begin with publishing of the Journal of Print and Media Technology Research in 2012 and was successfully implemented by the first editors Nils Enlund and Mladen Lovreček. The Journal is now the first periodical publication, primarily covering print and media, that is indexed and covered by Clarivate Analytics, an internationally recognized bibliometric data provider. One of the milestones of the journal is almost reached and it only depends on us when and how we will achieve the classification in the undisputedly desirable SCIE database of scientific journals with Impact Factor.

The Journal is now under the observation, so quality of published papers, respect for ethical standards and rules of scientific publication, the volume and regularly published issues will affect our further destiny. Interdisciplinary ori- entation, rigorous review procedures and careful editing will remain a key feature in the future.

There are three articles published in the current issue. The first research paper deals with the UV-ozone surface treat- ment of flexo printing plates, which represents an important novelty in the development of methods for improving the quality of prints, by varying the surface free energy and the polarity of the surface of the printing elements. Of course, the article opens up new questions and challenges, which is also the purpose of publishing the results of research work. The second case study paper shows an overview of colour management issues on modern tablet devices, which undoubtedly represent an opportunity and a challenge even in professional use, although they were originally intended primarily for the broad consumer market. The third review paper provides an overview of the possibilities of introduc- ing modern methods of Data Analysis based on Big Data, which is already implemented in paper and other industries. Systematic introduction and definition of those methods with practical examples of current and potential new uses in the field of packaging printing and thus also in the field of general printing industry are shown.

In the Topicalities, edited by Markéta Držková (marketa.drzkova@jpmtr.org), excerpts from some recently completed EU-funded research projects where printing technology was included as a part of the research work, are presented; together with new market reports and surveys from the field. In the Bookshelf new books covering nanomaterials, light and colour, QR codes, design, conducting polymers and sustainability issues are introduced. Three abstracts of doctoral theses are showing the research results in printed electronics, device physics and photography. The listed events show the worldwide interest for research results and business opportunities in printing technology, nanomaterials, printed electronics and functional printing, together with packaging and label printing.

One of the forthcoming events is the traditional 44th International iarigai Conference: Advances in Printing and Media Technology, hosted by iPrint Institute of the School of Engineering and Architecture Fribourg, Switzerland. Many authors, reviewers and editors of the Journal will attend this event and we are expecting interesting contributions from different research fields including industrial printing and printing processes, printed functionality, printing inks, substrates and quality. We hope that some ambitious authors will decide to present their achievements in the future as extended and supplemented research papers on most interesting topics, in the Journal.

Ljubljana, July 2017

JPMTR 095 | 1704 Research paper

DOI 10.14622/JPMTR-1704

Received: 2017-05-09

UDC 777.2-021.465-023.7

Accepted: 2017-07-31

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2-17

 

Modifying the qualitative properties of print by surface treatment of flexographic printing plate

Tamara Tomašegović1, David Beynon2, Tim Claypole2 and Sanja Mahović Poljaček1

E-mails: ttomaseg@grf.hr; d.g.beynon@swansea.ac.uk; t.c.claypole@swansea.ac.uk; smahovic@grf.hr

1 University of Zagreb, Faculty of Graphic Arts, Getaldićeva 2, 10 000 Zagreb, Croatia

2 Welsh Centre for Printing and Coating, College of Engineering, Swansea University, Swansea University Bay Campus, Engineering East, Crymlyn Burrows, Swansea, SA1 8EB, UK

Abstract

In the fast-pace technology development in graphic industry, modern flexography has found its domain mostly in the packaging sector and it is increasingly of interest for functional printing. Functional printing has a relatively low market value but greater interest in research. Due to the new qualitative requirements, workflows and materials used in flexography had to be updated and improved. The application of digitally controlled processes and procedures has taken the place of the analogue production, together with the new methods of material processing and improvements of the materials themselves. This research focuses on the functional modification of photopolymer flexographic printing plate’s properties with the aim of achieving optimal output quality. During the transfer of the printing ink from the anilox to the printing plate and then to the printing substrate, surface properties of the printing plate influence the quality of the print. Therefore, surface properties of the printing plate should be compatible with the used printing ink and the printing substrate, which is especially important when using new formulations of inks and experimenting with different printing substrates and applications, for example in functional printing. In this research, samples of photopolymer flexographic printing plates were exposed to UV-ozone treatment in order to modify the surface properties of the photopolymer material. Results have displayed significant changes in surface free energy of the photopolymer material when the printing plate samples were exposed to the UV-ozone for periods up to 5 minutes. In order to analyze the quality of the prints produced with UV-ozoned flexographic printing plates, test prints were produced. Prints produced with printing plates with longer UV-ozone treatment have displayed the qualitative changes in the reproduction of fine printed elements, i.e. the width of fine lines, coverage values, ink volume on print and the definition of the shape and edges of printed elements. Changes of named properties of the print are significant for conventional, and in many cases for functional printing. Performed research proved that the functional modification of flexographic printing plates with the aim of improving the print quality is possible. The UV-ozone treatment is a procedure where the printing plate is exposed to significantly higher energy than with conventional UVA and UVC tubes. Therefore, the duration of the UV-ozone treatment must be precisely adjusted in order to maximize the quality of the print, while at the same time maintaining printing plate’s functionality.

Keywords: flexography, photopolymer, UV-ozone, surface free energy, ink transfer

JPMTR 096 | 1705 Case study

DOI 10.14622/JPMTR-1705

Received: 2017-05-16

UDC 004.92 | 535.2

Accepted: 2017-06-29

Colour management of tablet devices

Reem El Asaleh and Daniel Langsford

E-mails: reem.elasaleh@ryerson.ca; daniel.langsford@ryerson.ca

Ryerson University, 350 Victoria Street, Toronto, ON M5B 2K3

Abstract

As of now, the creation and use of tablet devices in society have been strictly focused on the benefits for commercial use. While other devices such as monitors or cameras are capable of device-specific colour management, tablet devices have been left behind with only manufactured colour adjustments available. This has resulted in a limited use of tablet devices such as the Windows Surface, Apple’s iPads and Samsung’s Galaxy Tab S, in the professional/printing industry. In particular, the use of these tablets have had limited integration with an already existing and functioning colour management workflow. This study analyzed and identified the colour reproduction capabilities of specific tablet devices so that possible workflow or industry integrations can be established. The study evaluated each device through the creation of an ICC profile using i1Profiler. The profiles were then compared using Macbeth ColorChecker Classic Chart for key colour comparison and IT8.7/4 for colour difference values (∆E00). Amongst all profiles, general colour gamut was observed using ColorThink Pro software. The outcome of the tests has shown that each device tested thoroughly resulted in an acceptable industry set CIEDE2000 standards with average values below 3. It was also seen that each device is limited by various roadblocks or concerns when looking for future integration into professional industry workflows. Overall, while technically usable, the use of tablet devices in the professional/printing industry depends on the extent to which this industry accepts to integrate these devices in their workflows.

Keywords: colour reproduction, colour differences, colour management workflow, colour gamut

JPMTR 097 | 1706 Review paper

DOI 10.14622/JPMTR-1706

Received: 2017-07-10

UDC 04.6-022.56(676+655.1)

Accepted: 2017-07-30

Technologies for using Big Data in the paper and printing industry

Igor Karlovits

E-mail: igor.karlovits@icp-lj.si

Pulp and Paper Institute, Ljubljana, Slovenia

Abstract

The paper gives a review about the possibilities of using Big Data technologies in the print industry. Current situation and research are presented with a brief overview and description of the data mining process. Process parameters readouts and process modelling by using problem-solving methods open up new possibilities for production efficiency. Different authors have provided solutions for print and print quality related problems by data collection through sensor readouts and real-time monitoring of different production system variables. Major production techniques (offset and flexo printing) have been partly investigated and monitored through closed inline controls, or metadata communication with the use of Job Definition Format. The researchers have found possibilities in solving particular print or production related issues with the use of Big Data techniques or its subsets, but still, no integrated market ready solution exists. A theoretical framework for a corrugated production factory is shortly presented, outlining possible applications and connections for a fully integrated data mining system that could bring the Industry 4.0 in the printing sector.

Keywords: data mining, process control, printing, papermaking