DEINKING NOVINA U FUNKCIJI PROCESA TISKA I FORMULACIJE BOJILA

Ivana Bolanča Mirković, Zdenka Bolanča

Sažetak

Celulozna vlakanca s kojih je uklonjeno tiskarsko bojilo je korisna sirovina za proizvodnju različitih vrsta papira kao što su: novinski papir, uredski papiri, karton, ambalažni papiri i higijenski papir, a cilj je dodatna ekološka održivost. Efikasnost deinkinga ovisi o: vrsti bojila, površinskim svojstvima papira, tehnici i uvjetima tiska, kao i starenju otiska. Uloga deinking postrojenja je uklanjanje kontaminirajućih tvari s vlakanaca i dobivanje pulpe s prihvatljivim mehaničkim i optičkim svojstvima. U posljednjem desetljeću 20. stoljeća tiskaju se novine u fleksografiji s bojilom na osnovi vode radi nešto nižih troškova ulaganja u strojeve, kao i ekološko povoljnijih bojila na osnovi vode, međutim utvrđeno je da su ta bojila problematična u procesu deinkinga. Obzirom na stalno poboljšanje kemizma bojila, istraživanja u ovom radu se fokusiraju na utvrđivanje efikasnosti deinkinga novina otisnutih flekso bojilima na osnovi vode, samih i u kombinaciji s novinama otisnutim cold-set ofsetnim bojilom. Za reciklažu uzoraka koristi se alkalna kemijska deinking flotacija. Autori diskutiraju karakteristike optičkih svojstava vlakanaca prije i poslije deinkinga u odnosu na formulaciju bojila i tehniku tiska. Rezultati su doprinos razumijevanju opisane problematike i bitni su za razvoj novih bojila s većom efikasnošću deinkinga.

Ključne riječi: novine, fleksografija, cold-set ofset, formulacije bojila, deinking, optička svojstva vlakanaca

DEINKING OF NEWSPRINTS IN FUNCTION OF PRINTING PROCESS AND INK FORMULATION

Ivana Bolanča Mirković, Zdenka Bolanča

Abstract

Deinked pulps are useful raw materials used to produce different paper grades such as newsprint, office paper, cardboard, packaging grades and hygiene paper with aim more ecological sustainability. Deinkability behavior depends on : ink type, paper surface, printing technique and conditions as well as ageing of the print. The role of deinking plant is to remove contaminants from fibers to produce a pulp with acceptable mechanical and optical properties. In newspaper publishing water-based flexography was predicted in the last decade of the 20th century because of the somewhat lower investment cost for flexo printing presses, the more environment friendly water based inks, the lower start-up waste, however, this inks present a problem to the deinking process. Due to constantly improving ink chemistry, research presented in this paper focuses on deinkability of water-based flexographic news paper in combining with cold-set offset printed paper. Alkaline chemical deinking flotation is used for samples recycling. The authors discuss the characteristics of the optical properties of undeinked and deinked fibres in relations to the printing ink formulations and printing process. Such an understanding is essential in the development of new, more deinkable inks.

Keywords: newspapers, flexographic printing, cold-set offset printing, inks formulation, deinking, optical properties of fibres


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