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The bonding potential of pulp fibers is reduced by the paper recycling process. The most common technique for recovering this lost potential of secondary fibers involves upgrading the recycled pulp by blending it with virgin softwood pulps. In this research, we asses print stability on acid agents of UV inkjet prints when using straw pulp as reinforcing fibers in recycled papers. For that purpose, printing substrates were formed on the Rapid Kothen device from pulp obtained by blending different proportions of straw pulp and pulp of recycled fibers. Each printing substrate was printed in full tone with cyan, magenta, yellow, and black inks by digital technique of UV inkjet printing. Printed substrates were treated with various inorganic and organic acids under the conditions defined in the international standard ISO 2836:2004. Based on the measured spectrophotometric values of the untreated and acid-treated prints, the Euclidean color difference (ΔE00) was defined and the stability of prints was assessed. The results of spectrophotometric measurements indicate small to medium color differences of the prints due to the effect of all acids (ΔE00max. < 2.4) and it can be concluded that straw pulp in printing substrates from recycled fibers contributes to good chemical stability of prints. This research concludes that straw, as an annual renewable resource, can be used in conjunction with waste paper as an alternative to wood, which is currently the dominant raw material for graphic industry and producing paper. [ABSTRACT FROM AUTHOR]

The paper deals with the preferences of the Slovak university students either for digital or print medium while reading for school work. Respondents of our sample belong to generation Y who grow up and still live in the digital environment. In spite of this fact we supposed some share of them tends to utilise hard copy or combines it with digital platforms. Findings showed that printed text is widely preferred among our sample of respondents. Majority of university students use paper as a medium for school work. Important factors influencing a choice of medium are length of text, ability to concentrate on reading text, overall time spent by reading, and attitudes of individuals. [ABSTRACT FROM AUTHOR]

Paper-top interface (PTI) is a fusion of paper and digital technology. We developed a PTI prototype system for increasing learning effects in a classroom. The prototype system uses a visual-marker-based AR (Augmented Reality) technique and projects e-Learning materials onto the corresponding papers on a classroom desk. A student is allowed to not only view e-Learning materials under his/her eyes but also write on the papers (pages of his/per notebook) using pencils. [ABSTRACT FROM AUTHOR]