UTJECAJ TISKOVNE PODLOGE I SUŠENJA NA ELEKTRIČNI OTPOR ELEKTROVODLJIVIH BOJILA

INFLUENCE OF PRINTING SUBSTRATE AND CURING ON ELECTRICAL RESISTANCE OF CONDUCTIVE INKS

Josip Jerić, Diana Bratić, Kristijan Golubović

Sažetak

Funkcionalni tisak je porastom dostupnosti novih tehnologija i ideja postao sve zanimljiviji smjer razvoja grafi čke tehnologije. Tiskarska bojila koje provode struju postoje već značajniji vremenski period, no još uvijek postoji velik broj njihovih mogućih aplikacija u svakodnevnu uporabu, kao i mogućnost napretka i razvijanja njihovih svojstava. Stoga je cilj ovog bio rada defi nirati promjene u električnom otporu, te samim time i provodljivosti s obzirom na vrstu tiskovne podloge, duljine i širine linije, broja sušenja i samog stanja bojila. U radu se proučavao električni otpor otisaka napravljenih tehnikom poluautomatskog sitotiska. Otisci su otisnuti elektrovodljivim sitotiskarskim bojilom na dvije vrste tiskovnih podloga, običnom nepremazanom papiru i recikliranom papiru. Pritom su korištena dva uzorka bojila, bojilo kojemu je istekao rok trajanja te novo bojilo. Nakon otiskivanja, otisci su bili podvrgnuti IR sušenju. Jedan set otisaka sušen je jedanput, a drugi set otisaka četiri puta. Nakon provedenog sušenja, multimetrom je mjeren električni otpor na linijama različitih duljina i debljina. Dobiveni rezultati ukazuju da su vrijednosti električnog otpora veće kod starih, nego kod novih bojila. Također su uočene razlike u jačini električnog otpora na različitim tiskovnim podlogama, kao i ovisnost jačine električnog otpora o dimenziji otisnutih linija.

KLJUČNE RIJEČI: ELEKTROVODLJIVA BOJILA, SITOTISAK, ELEKTRIČNI OTPOR

Abstract

Functional printing became an interesting direction of development in graphic technology. Conductive inks exist for some time, but there are still many possible applications in daily use, as well as the possibility of their further development in various segments. Th is paper addresses the change in electrical resistance of prints, depending on printing surface, width and size of printed lines, number of curing and the age of the ink. Th e prints were made using the semi-automated screen printing. Th e prints were printed with electroconductive ink on two types of printing substrates: plain uncoated paper and recycled paper. Two samples of inks were used - ink which is expired, and a new ink. Th e prints were IR dried. One set of prints was dried only once, and the other four times. After drying, the electrical resistance on the lines of diff erent dimensions (length and width) was measured. Th e results are implicating that the electrical resistance is higher on prints that used the old ink. Also, there are notable diff erences in the electrical resistance based on the printing surface, as well as the dimensions of the printed lines.

KEY WORDS: CONDUCTIVE INKS, SCREEN PRINTING, ELECTRICAL RESISTANCE


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