Abstract
Expensive synthetic coating materials can be replaced with natural coatings and surface treatment with natural components and additives which are friendlier to the environment and have normally better special surface properties. However, special properties can be obtained with surface functionalization by chemical or surface geometry modification. Beside optical properties, the trends of lightweight materials, i.e. reducing grammage by using nano materials and products (i.e. NMP - N-Methyl-2-Pyrrolidone), lower specific energy requirement and costs, forces increasing of pigments usage. Results of survey showed that surface properties of papers coated with modified ground calcium carbonate (GCC), required for inkjet printing with water-based inks had improved significantly, whereas the increment of printed object has minimum differentiation from the ideal, computer-based character.
Highlights
The paper industry has realized high-speed inkjet printing as a vast new business opportunity
Unlike solvent-based liquid or paste ink systems used in conventional printing, i.e. offset, screen, gravure, etc., the ink systems used for inkjet printing are water based, containing 65 to 95 % of water
I.e. with quaternary ammonium salt, of ground calcium carbonate (GCC) pigment particles, with the pH 10.2 and zeta potential between – 30 and – 40 mV, has a positive influence on capturing the anionic dye and keeps it from uncontrolled spreading on the paper surface, i.e. bleeding and wicking
Summary
The paper industry has realized high-speed inkjet printing as a vast new business opportunity. In order to absorb large quantities of ink quickly and produce high-quality colour images with inkjet printers, specialty media are required (Chapman & Michos, 2000). The solids content of a coating varies between 50 and 70 %, which depends upon the properties of the substrate, the required rheological properties of a coating dispersion, the coating technique, the coating speed, etc. It is desirable for coating to keep the solids content as high as possible, partly for environmental reasons, partly to save energy during the drying stage, which has a large impact on the process economics. Under laboratory conditions where the coating speed is considerably lower and unconventional substrates are sometimes used, a paper coating of low solids content is often easier to handle. A common coating technique is to apply a pre-coating, i.e. to cover the fibre surface and to provide a smooth base for the subsequent application of one or two top-coating layers to improve the optical properties and printability
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