Devijacija kvalitete jednodnevnog novinskog tiska

Duvnjak, Jelena (2016) Devijacija kvalitete jednodnevnog novinskog tiska. Master's thesis - Graduate Programme. Grafički fakultet. [Mentor: Zjakić, Igor].

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Abstract

Ofsetni tisak od svog izuma do danas je postao najraširenija i najčešće korištena tehnika tiska. Njegova jednostavnost, isplativost za velike naklade i prilagodljivost različitim zahtjevima i potrebama tržišta omogućila mu je prisutnost u svim sferama grafičke industrije. Kako bi se postigla željena kvaliteta novinskog tiska moramo kontrolirati više ključnih parametara. Pod parametrima podrazumijevamo kontrolu pojedinačnih etapa tiska ili dijelova sustava, a pad samo jednog parametra može uzrokovati značajan pad kvalitete. Neki od važnijih parametara za koje ne smijemo dopustiti pad su: napetost tiskovnih elemenata I slobodnih površina kod tiskovne forme, hrapavost površine valjka za obojenje, radne temperature valjaka, sastav bojila i otopine za vlaženje, struktura tiskovne forme, njena izdrživost, te temperature i vlaga u prostorima proizvodnje. S obzirom da kod tiska dolazi do gubitka informacija odnosno pada kvalitete u odnosu na originalnu reprodukciju bitna je kontrola otisaka kroz sam proces otiskivanja. Kontrolu punog tona i rastriranog polja kontroliramo mjernim stripovima, deformaciju rasterskih elemenata koji uzrokuju smicanje i razmazivanje signalnim stripovima, a kontrolom registra osiguravamo pravilno nalijeganje boje kod višebojnog otiska. Ofsetne rotacije specifične su po građi tiskovnih agregata, tiskovnih jedinica, uređaja za bojenje, vlaženje i sušenje i zbog toga kvaliteta dobivenih otisaka u novinskoj rotaciji zaostaje za kvalitetom otisaka koja se postiže u ofsetnom tisku iz arka. Unatoč tome, ofsetna rotacija pronašla je savršenu primjenjivost u tisku novina gdje zadovoljava potrebe tržišta bez prevelikih troškova. Novinska rotacija postala je temelj izrade dnevnih tiskovina sa zasebnim standardima, metodama kontrole kvalitete i rasprostranjenosti koja se, unatoč digitalizaciji i globalizaciji novina u zadnjih 20 godina, neće ozbiljnije mijenjati.

Item Type:	Master's thesis - Graduate Programme
Mentor name:	Zjakić, Igor
Thesis Committee:	Modrić, Damir and Zjakić, Igor and Mrvac, Nikola
Defence date:	30 September 2016
Abstract in english:	Ever since its invention and until today, the offset print has been the most widespread and most commonly used printing technique. Its simplicity, cost-effectiveness for large print editions and adaptability to different requirements and market needs ensured its presence in all areas of the printing industry. In order to achieve the desired quality of the newspaper print, we have to monitor multiple key parameters. The prameters include the control of individual phases of the printing proces and the elements of the printing system, since a decrease of a single parameter can cause a significant drop in quality. Some of the most important parameters that should not decrease are: tension of the printing elements and the free areas of the printing form, the roughness of ink roller’s surface, the roller’s operating temperature, the composition of dye and wetting solution, structure of the printing form and its durability, and temperature and humidity in the areas of production. Since there is a loss of information during the prnting process, it is important to monitor the quality of individual prints in comparison with the original reproduction. Rich tone and raster field control are measured through measurement strips, the deformation of raster elements who cause shearing and smearing is measured throgh signal strips, and the register control ensures the dye is accurately applied in case of multi-color print. Offset rotations are distinctive because of the way its press aggregates, press units and dyeing devices are constructed, and therefore the quality of the prints in newspaper rotation is falls behind the quality of print achieved with offset sheet-fed printing. Nevertheless, offset rotation is perfectly applicable in newspaper print, where it meets the market's needs without the excessive costs. Newspaper rotation has become a cornerstone for daily newspapers production with separate standards, methods, quality control and distribution that, in spite of digitization and globalization of the newspaper in the last 20 years, will not drastically change.
Uncontrolled Keywords:	ofsetni tisak, novinski tisak, rotacija, bojilo, cilindar, tiskovna forma
Keywords in english:	offset printing, newspaper printing, rotation, color, cylinder, the printing form
Subjects:	TECHNICAL SCIENCES > Graphic Technology
Institution:	Grafički fakultet
City:	Zagreb
Number of Pages:	40
Callnumber:	ZJA 2016 DUV
Inventory number:	DB611
Depositing User:	Nina Jelača
Status:	Unpublished
Date Deposited:	16 Dec 2016 12:48
Last Modified:	16 Dec 2016 12:48
URI:	http://eprints.grf.unizg.hr/id/eprint/2663

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