Dragoljub Novaković

Termovizijska i spektrofotometrijska analiza diferenciranog nanosa boja na specifične podloge izložene toplinskim opterećenjima

Original scientific paper This paper presents experimental usage of updated control methods such as thermovision and spectrophotometric analysis in graphic industry. These methods were applied to research the influence of ink volume and material characteristics on colour and heat treated printed substrates. Samples used in these experiments were printed by digital ink jet printing technique using Mimaki JV22 printing machine and J-Eco Subly Nano inks. As printing substrates, three different types of materials were used. Materials were different in respect of fabric weight and thread count, while material composition was the same for all three materials. The appropriate test card consisting of fields of CMYK colours was printed, varying the number of ink layers applied. Samples were exposed to heat treatment after printing. The heat applied was measured by thermovision camera. Spectrophotometric measurements were conducted before and after heat treatment. Based on data gathered by spectrophotometric measurements colour difference ΔE76 was calculated. Results showed that increasing number of layers, as well as right choice of substrates, can improve behaviour of printed product during exploitation.

ANALIZA PARAMETARA KOJI UTJEČU NA KVALITETU TISKA DOBIJENOG TEHNIKOM SITO TISKA NA PVC FOLIJAMA

Screen printing technique is used to apply transfer images to a wide variety of substrates. PVC foils can also be used as substrates. In the screen printing process on PVC foils different type of substrates, inks, as well as different mesh types, can be used. In this research, we used two types of substrates (ORACAL 640 Print Vinyl and LG Hausys LP2712), three different kinds of ink (Hi-Gloss 35 000, 85 000 and Ondaflut Texilon 58.000), and screens with three different mesh counts (77, 120 and 140 n/ cm). These substrates are exposed to various environmental factors including, light, etc. The aim of this paper is to determine differences between samples caused by variation of mentioned parameters on lightfastness.