Biodegradation of thermochromic offset prints

Vukoje, Marina; Rožić, Mirela; Miljanić, Snežana; Preprotić, Suzana Pasanec

doi:10.3183/npprj-2017-32-02-p289-298

Cited by 13 publications

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“…These inks are very sensitive to daily light, UV irradiation and atmospheric conditions and it is recommended to be stored at temperatures no higher than 27°C. Used inks are vegetable oil-based [15,16]. Some properties of used thermochromic inks are presented in Table 2.…”

Section: Thermochromic Inksmentioning

confidence: 99%

Optical properties of deinked pulp containing thermochromic offset inks

2019

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This paper evaluates the efficiency of thermochromic offset prints recycling using deinking flotation method. Since offset thermochromic inks differ in their composition from conventional offset inks, the aim of this research was to determine how effectively they can be recycled. In the experimental part of the work, the laboratory printing of two thermochromic inks was conducted. For both types of inks, white uncoated paper was used as a substrate. After accelerated aging, the prints were mixed in equal proportions and then recycled in laboratory conditions, by means of deinking flotation. During the recycling process, handsheets and filter pads were prepared from the pulp obtained before and after deinking flotation. Handsheets and filter pads were also prepared from unprinted paper that was used as printing substrate, in order to obtain reference samples. The deinking flotation efficiency was evaluated by calculating the flotation loss, ash elimination, pulp's brightness and whiteness increase and determination of residual ink area. The obtained results indicate that thermochromic prints are poorly deinkable. A small increase in deinked pulp's brightness and whiteness (approx. 7% and 11%) is noticed. The image analysis shows that flotation deinking managed to eliminate around 40% of the total dirt area of thermochromic ink.

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Section: Thermochromic Inksmentioning

confidence: 99%

Optical properties of deinked pulp containing thermochromic offset inks

2019

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“…Below its activation temperature, the print was coloured in green and above its activation temperature the print was coloured in yellow (hereinafter GY). Thermochromic ink is composed of blue microcapsules dispersed in classic yellow offset ink [21]. The printing trials were carried out using Prüfbau Multipurpose Printability Tester.…”

Section: Printing Substrate and Printing Inkmentioning

confidence: 99%

“…Thermochromic offset ink -paper interactions and print biodegradation drying of vegetable oil [21,22]. Microcapsules present in printing ink have polar nature than the classical pigment particles which was confirmed by solvent-thermocromic print interactions using Hansen solubility parameters that rank the solvents based on their estimated interaction capabilities [23].…”

Section: Introductionmentioning

confidence: 99%

Thermochromic offset ink – paper interactions and print biodegradation

Vukoje

Rožić²

2018

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“…2016 showed that different physical and chemical properties of paper doesn't affect the value of the thermochromic ink characteristic temperature, but it influences the shape of the thermochromic ink hysteresis curve [8]. In addition, the printing substrate has a significant influence on thermochromic prints biodegradation ability [9][10][11][12][13]. Although the mechanism of functionality of thermochromic leuco dye-based inks is relatively well known, there is a lack of information about the influence of paper substrate on thermochromic prints colorimetric characteristics, which is a significant factor from an application perspective.…”

Section: Introductionmentioning

confidence: 99%

The influence of printing substrate on colorimetric properties of thermochromic offset prints

et al. 2019

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This paper investigates the colorimetric properties of reversible thermochromic offset printing ink on different paper substrates. Reversible thermochromic (TC) printing ink is printed by offset printing on four different printing substrates. Colorimetric measurements are performed by measuring diffuse reflection by determining uniform measurable physical size in the CIELAB colour space of the examined sample at temperatures ranging from 35°C to 75°C during heating and at the same temperatures up to 20°C. As the colour of the TC prints depends on the temperature, which results in colour hysteresis, it is noted that the colour hysteresis is affected by the printing substrate. The activation temperature given by the producer (63°C), is above the obtained temperatures, for print on filter paper 61,3°C, for print on synthetic paper 61,5°C, for print on bulky paper 60,9°C, with the highest deviation in the case of print on recycled paper (59,4°C). The results of total colour difference of samples measured between heating and cooling at the temperature well below the final chromic temperature and the CIEDE2000 total colour difference between the samples in the heated and cooled state as a function of temperature showed that the highest colour difference was obtained in TC print on the filter paper.

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Biodegradation of thermochromic offset prints

Cited by 13 publications

References 0 publications

Optical properties of deinked pulp containing thermochromic offset inks

Optical properties of deinked pulp containing thermochromic offset inks

Thermochromic offset ink – paper interactions and print biodegradation

The influence of printing substrate on colorimetric properties of thermochromic offset prints

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