Thermovision and spectrophotometric analysis of ink volume and material characteristics influence on colour changes of heat treated printed substrates

Abstract

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. Keywords: digital textile printing; heat treatment; ink layers; material characteristics Termovizijska i spektrofotometrijska analiza diferenciranog nanosa boja na specifične podloge izložene toplinskim opterećenjimaIzvorni znanstveni članak U radu su predstavljene primjene suvremenih metoda kontrole, kao što su termovizijska i spektrofotometrijska analiza, u grafičkoj industriji. Suvremene metode kontrole primijenjene su pri istraživanju parametara diferenciranog nanosa boje na specifične podloge izložene toplotnim opterećenjima. Uzorci koji su rabljeni za istraživanje odštampani su Ink jet postupkom na digitalnom tiskarskom stroju Mimaki JV 22 koja koristi J-Eco Subly nano boje. U procesu tiska, rabljene su tri vrste podloga, pri čemu je za sve njih sastav materijala bio isti, ali su se razlikovale prema parametrima površinske mase i gustoće pletenja. Odgovarajuća test karta koja se sastojala od polja CMYK otiskana je s pet različitih nanosa boje. Ti uzorci su izloženi toplinskom djelovanju, pri čemu je polje toplinskog djelovanja mjereno termovizijskom kamerom. Uzorci su analizirani spektrofotometrijskim mjerenjima prije i poslije toplinskog djelovanja te je na osnovu tih podataka određena vrijednost razlike boje (ΔE76). Dobiveni rezultati su pokazali da povećanje broja nanosa boje, kao i odabir odgovarajuće podloge za štampu, može povećati eksploatacijske karakteristike otisaka.

Analysis of the Temperature Distribution on the Surface of Saddle-Shaped Briquettes Consolidated in the Roller Press

“…Thermal phenomena are a rich source of information about technological processes and changes or irregularities occurring during them [ 36 ], which allows for the control of process parameters and the necessary modification. Thermography was used, among others, to control the stability of the extrusion process of poly (vinyl chloride) [ 37 ], textiles [ 38 , 39 , 40 ], tire vulcanization [ 41 ], production of casting molds [ 42 ], the process of casting and cooling steel [ 43 ] iron ores (with biomass) [ 44 ], the quality of moldings made of loose materials (microcrystalline cellulose) leaving the compaction zone [ 45 ], and even in the process of cooling of natural rock materials [ 46 ]. Another field of application for thermography has become research on materials and their structure [ 45 , 47 ].…”

Aging and Degradation of Printed Materials

“…However, due to the high gloss of materials, it is advisable to use a polarizing filter (Izdebska et al, 2013;Ka sikovi c et al, 2015). At the same time, it is easier to detect changes in the concentrations of the dye by measuring the changes in the optical density of the transmitted light.…”

Colour fastness of screen printed polyamide knitwear to chlorinated water

“…There are many different kinds of textile materials in use, as well as various printing techniques that can be used to print them (Dawson & Hawkyard, 2000;John & Anandjiwala, 2009;Stančić et al, 2014;Jurič et al, 2015;Kašiković et al, 2015). Printing techniques suitable for printing of textile materials are: screen printing, digital printing and thermal transfer printing (Novaković, Kašiković & Vladić, 2010).…”