Naslov
Effect of accelerated ageing on degradation of unprinted and printed graphic paperboards

Autori
Černič-Letnar, Marjeta ; Hladnek, Aleš ; Kropar-Vančina, Vesna

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

Izvornik
29th International Research Conference of IARIGAI "Advances in Graphic Arts&Media Technology" : proceedings / - Sankt Gallen : EMPA/UGRA, 2002, 216-233

Skup
International Research Conference of IARIGAI Advances in Graphic Arts&Media Technology (29 ; 2002)

Mjesto i datum
Luzern, Švicarska, 08.09.2002. - 11.09.2002

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
graphic paper and paperboard; graphic paper and paperboard dcgradation. accelerated ageing; permanence; durability; surface; optical and colour properties; Principal components analvsis.

Sažetak
In the study we investigated thc influcnec of surface treatmcnt on permancnce and stabilitv' of various graphic paperboard types - board for books, brochures, busincss cards. calendars, protection package - under thc conditions of accelerated ageing with increased temperature and relativc humiditv in the absence oflight according to ISO/5630/3, and as specified for material on paper/board of permanent valuc by EN/ISO 9706 (*). Paperboards \vere coatcd vvith various coating colours, and subsequently lab printed in offset technique. Thc cffcct of artificial ageing on structural and surface properties - mainly board/liquid interactions - as vvell as on image optical and colour stability was monitored. The changes observed in surface characteristics - smoothness, roughness, air permcability, absorptivity measured by classical and recent test mcthods. surface cnergy - during and aftcr the accelerated ageing process revealed a strong influence of coating components (pigmcnts. bindcrs) and surface treatment typc. Increase in roughness, altcration of board absorption behaviour and change in optical and colour paramcters - decrease in brightness. increase in yellowncss. colour shift with samples containing higher amount of optical brightening agents - were the most pronounced results. Measured differences in colour (dE) and optical densitv values indicatcd that colour stabilitv of offset imagc approachcd the limit values, which are set for an imagc of still acceptable quality. Black (K) exhibited the highcst stability among CMYK colours. Image colour stability significantlv depends on surface and optical board characteristics, especially on gloss and optical brightener agent, as vvell as on board fibre composition and coating pigments.

Izvorni jezik
Engleski

Znanstvena područja
Grafička tehnologija

POVEZANOST RADA