Utjecaj konstrukcije DURST Inkjet ispisnih glava na krivulje reprodukcije

Igor Majnarić, Ivan Pučić, Maša Božanić, Nemanja Kašiković, Ivana Bolanča Mirković

Sažetak

Današnja Inkjet tehnologija otiskivanja omogućava komercijalna otiskivanja od jednog primjerka pa do nekoliko tisuća primjeraka. Da bi se to ostvarilo tijekom konstruiranja morati će se paziti na odabir veličine ispisne glave. MEMS Inkjet tehnologija omogućava ugradnju velikog broja mlaznica u ispisnu glavu. Time se dobiva veća širina ispisa ali i veća produktivnost. Cilj ovog rada je istražiti da li se modularnim slaganjem manjih glava u jednu veću utječe na buduću kvalitetu Inkjet otiska, te kakvi su tonski prirasti u krivuljama reprodukcije. Pritom će se ispitivati otisci dva Durstova UV Inkjet printera (modela Rho 512 i modela Omega 2 koji koriste Spectra® Polaris PQ-512 glave) odnosno dva tipa UV svjetlosna izvora (UV Inkjet boja =Rho Roll i UV LED boja = Omega Ink). Dobiveni otisci mjereni su spektrofotometrom i denzitometru x-rite eXact te izraženi kao rastertonska vrijednost otiska (RTV%) i prirasti rastertonske vrijednosti otiska (Z%). Analiza pokazuju da manje ispisne glave ostvaruju nepravilnije krivulje reprodukcije te imaju varijaciju vrijednosti prirasta tonskih vrijednosti. Takvi otisci posjeduju i veću oscilaciju u veličini formiranih rasterskih elemenata. Najizraženije tonske oscilacije detektirane su kod žutog pigmentiranog UV Inkjet otiska. Njih na svjetlim tonovima gotovo i nema, što se nemože reći i za srednje i tamne tonove ΔZRho512_omega= 4,46%.

Ključne riječi: Inkjet ispisna glava, MEMS tehnologija, krivulja reprodukcije

The impact of construction DURST Inkjet printhead on reproductions curves

Igor Majnarić, Ivan Pučić, Maša Božanić, Nemanja Kašiković, Ivana Bolanča Mirković

Abstract

Today’s Inkjet printing technology allows commercial printing from one copy to several thousands of copies. This is greatly affected by a single parameter, the size of the printhead. MEMS Inkjet technology enables the installation of a large number of nozzles in the printhead that provides larger print width and higher productivity. The aim was to investigate whether the modular stacking of smaller heads into a larger has influence on the future quality of inkjet prints and whether any anomalies arise on the print. In this paper it was tested how the multiplication of print heads affects the quality of colour reproduction. Tested prints were printed on two Durst’s UV inkjet printers: the model Rho 512 and model Omega 2. Two types inkjet head were used Spectra® Polaris PQ-512/35 AAA i Spectra® Polaris PQ-512/15 AAA and two inkjet inks: UV Inkjet ink (Rho Roll) and UV LED ink (Omega Ink). Obtained colorimetric prints were measured with a spectrophotometer X-Rite eXact. Smaller printheads can achieve prints with higher quality. The best image quality is achieved on the machine Durst Omega 2. Yellow colour separation gave the greatest oscillation in the size of screen elements. Dot gain on low bright hues is almost nonexistent, which can not be said for medium and dark tones (ΔZRho512_omega = 4.46 %)

Keywords: Inkjet printhead, MEMS technology, tone value curve


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