Naslov
Effect of Accelerated Ageing on Degradation of Unprinted and Printed Graphic Paperboards

Autori
Černič Letnar, Marjeta ; Hladnik, Aleš ; Kropar Vančina, Vesna

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 29th IARIGAI Research Conference / - Sankt Gallen : EMPA/Ugra, 2002, 216-233

Skup
Proceedings of the 29th IARIGAI Research Conference

Mjesto i datum
Luzern, Švicarska, 08.09.2002. - 11.09.2002

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Accelerated Ageing; Degradation of Graphic Paperboard; Durability and Permanence of Graphic Paperboard; Principal Component Analysis; Properties of Graphic Paperboard - Surface; Optical and Colour

Sažetak
In the study we investigated the influence of surface treatment on permanence and stability of various graphic paperboard types - board for books, brochures, business cards, calendars, protection package - under the conditions of accelerated ageing with increased temperature and relative humidity in the absence of light according to ISO/5630/3, and as specified for materials on paperboard of permanent value by EN/ISO 9706 (∞ ). Paperboards were coated with various coating colours, and subsequently lab printed in offset technique. The effect of artificial ageing on structural and surface properties - mainly board/liquid interaction, as well as, on image optical and colour stability was monitored. The chane observed in surface characteristics - smoothness, roughness, air permeability, absorptivity measured by classical and recent test methods, surface energy - during and after the accelerated ageing process revealed a strong influence of coating components (pigments, binders) and surface treatment type. Increasing in roughness, altering of board absorption behaviour and change in optical and colour parameters - decrease in brightness, increase in yellowness, colour shift with samples containing higher amount of optical brightening agents - were the most pronounced results. Measured differences in colour (dE) and optical density values indicated that colour stability of offset image approached the limit values, which are set for an image of still acceptable quality. Black (K) exhibited the highest stability among CMYK colours. Image colour stability significantly depends on surface and optical board characteristics, especially on gloss and optical brightener agent, as well as, on paperboard fibre composition and coating pigments.

Izvorni jezik
Engleski

Znanstvena područja
Grafička tehnologija

POVEZANOST RADA