Safety Evaluation of Deinked Pulp Containing Offset Thermochromic Inks

Hanzer, Sonja Jamnicki; Rožić, Mirela; Vukoje, Marina; Jukić, Mirela; Galić, Antonija

doi:10.15376/biores.13.1.678-690

Cited by 2 publications

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“…Despite that, most of the studies were conducted to determine the interactions inside the TC microcapsules between the solvent-developer and color former on the colorimetric properties of the thermochromic composite [4,[19][20][21], but there is a lack of studies regarding printing substrates and thermochromic printing ink interactions. In the field of graphic technology, most of the studies recently were devoted to thermochromic printing inks end-of-life solutions [22][23][24] and their health safety [25][26][27], UV stability [28], and novel approaches in measurements of thermochromic dynamic color change [29]. The increasing packaging added value through combination of printed electronics with the thermochromism phenomenon for development of thermochromic displays on cardboard packaging [30] and development of thermochromic microencapsulated inks for smart packaging [31] was reported, as well.…”

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confidence: 99%

Description of Thermochromic Offset Prints Morphologies Depending on Printing Substrate

et al. 2020

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In this study, the influence of physio-chemical properties of four printing substrates, fibrous papers (filter, bulky, recycled), and polymer film (synthetic paper) on the size of the thermochromic (TC) prints microcapsules was investigated. Results indicate that interaction between thermochromic ink and printing substrate determine the print morphology, i.e., porosity and roughness of printing substrate affect dimensions of TC microcapsules of resulting prints, while ink adhesion affects dimensional changes during heating–cooling cycle. Atomic force microscopy (AFM) analysis showed that microcapsules of the prints, on the surface of the smoothest synthetic paper, possess the smallest diameter and height, while, on the most porous and the most roughened surface of F paper, the microcapsules of the prints possess the highest diameter and height. By increasing the temperature to 40 °C, the biggest changes in the shape of the microcapsules (increase in height and decrease in diameter) were obtained using the surface of the hydrophilic filter paper. While using the recycled paper surface, the situation is opposite; the height and diameter of the microcapsules are reduced, and the microcapsules penetrate deeper into the paper structure (due to optimum adhesion). On the bulky paper surfaces, which are more hydrophobic than recycled paper (higher interfacial tension), the increase of temperature does not cause any significant changes in the shape and position of the microcapsules. The same behavior is observed using hydrophobic non-porous synthetic paper.

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Section: Introductionmentioning

confidence: 99%

Description of Thermochromic Offset Prints Morphologies Depending on Printing Substrate

et al. 2020

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Influence of Printing Technique and Printing Conditions on Prints Recycling Efficiency and Effluents Quality

2021

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The aim of this work was to determine the influence of the conventional offset printing technique and digital electrophotography printing with liquid toner (LEP) on some optical properties of recycled fibres. A series of LEP prints was made with the variation of the negative voltage of the developing drum (−200 V, −280 V, −350 V, and −430 V) after calibration of the machine and achieving standard densitometry values. Besides deinkability aspects, the quality of wastewater effluents after process of prints recycling was observed in order to make a conclusion regarding how different printing techniques, conditions in printing process, and different types of inks can affect the wastewater effluents. Results of image analysis showed that by increasing the negative voltage of developing drum in LEP printing technique, the formation of large ink particles on handsheet from recycled pulp increases. Depending on the size of the negative voltage of the developing drum, under the same experimental conditions, handsheets made from LEP recycled fibres have lower whiteness gain, brightness gain, and ΔERIC of handsheets compared to those made from the offset prints. In addition, a certain correlation was found between IEERIC (ink elimination), chemical oxygen demand (COD), and total organic carbon (TOC) of wastewater effluents after recycling of LEP prints and offset prints as well. Organic water pollution parameters (COD and TOC) showed higher values in wastewater after recycling of offset prints compared to recycling of LEP prints.

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Safety Evaluation of Deinked Pulp Containing Offset Thermochromic Inks

Cited by 2 publications

References 0 publications

Description of Thermochromic Offset Prints Morphologies Depending on Printing Substrate

Description of Thermochromic Offset Prints Morphologies Depending on Printing Substrate

Influence of Printing Technique and Printing Conditions on Prints Recycling Efficiency and Effluents Quality

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