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Presentations 2015, 2016

iarigai Toronto 2016
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iarigai VIGC, Brussels
Evolutions in food packaging printing

You are here: Conferences & Events * 2011 Budapest * Abstracts * 2. Printing Materials

2. Printing Materials

2.04 The influence of UV coating application on printed cardboard surface properties and colourimetric values

Igor Karlovi?, Erzs?bet Novotny, Ivana Tomi?, Dragoljub Novakovi?

Abstract
With the application of the widely used UV coatings as an surface enhancement materials which affect the optical properties of coated surfaces and final appearance of the printed product we can change the surface topography of the original surface like the printed paper. The UV coating after the curing process forms the final surface of the coated print which greatly influences the scattering and absorption of the incoming light. These changes of the surface properties can cause a change in colour appearance and thus yield unexpected results in quality control. The application of different amounts of the same UV coatings can lead to different surface properties due to the applied amount and rheological behavior of the coatings during the forming the final coated layer over the printed samples. By using contemporary surface investigation methodology the AFM and SEM microscopes we have obtained surface roughness data and measured  the scattering light and calculated  the colourimetric values. We have investigated the influence of three different amounts of UV glossy and matte oveprint coatings on the measured reflectance curves and colour difference values of offset printed cardboard samples.

Keywords: UV coating, surface roughness, reflectance, colour difference
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2.05 Extending the use of fibre based substrates using novel surface treatment methods: case studies

Vesa Kunnari, Annaleena Kokko, Tomi Erho, Timo Kaljunen, Thea Sipiläinen-Malm, Mikko Keränen


Abstract

Consumer trends and the business environment as a whole are changing with a continuously faster pace. Introducing new innovative and sustainable products are the key for success. Development of new bio-materials enables the development of novel sustainable products for packaging and printed media.

This paper presents three different cases where novel pilot scale surface treatment line has been used successfully to demonstrate three pre-commercial applications beyond traditional paper process concepts. The first application was based on replacement of traditional pigments in coatings by a thermoplastic starch pigment to create a smooth surface for printed electronics. The second application was based on an oxidizing reaction between an enzyme and a substrate to produce a colour reaction. The third application concentrated on tailoring paper surface properties using thin starch based coating layer so that the same base paper could be used for offset or rotogravure printing depending on the end use.


Keywords: Surface treatment, printed electronics, enzyme, colour reaction, tailored surfaces
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2.06 Improving the light fastness of sublimation transfer printed polyester substrate

Imadeddine Afara, Philip Urban, Edgar Dörsam

Abstract
In this paper we are investigating methods to improve the light fastness of sublimable colorants printed on a polyester substrate. A combination of UV-Absorber (UVA) and Hindered amine light stabilizer (HALS) is applied directly as post-treatment to the printed polyester substrate. The influence of the colorants concentration (C%), transfer-temperature (Ttrans), transfer-time (ttrans) and the combination of the UVA/HLAS is investigated in this work. Distinct combinations of these influencing factors are found for that the light fastness of printed fabric is improved significantly in terms of ?E*ab colour difference. The light fastness of all CMYK inks is improved significantly (50-70 %)

Keywords : light fastness, sublimation transfer printing, polyester substrate, UV-absorber and HALS
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