Arif Karademir

Effects of Filler Content and Coating on the Water and Oil-Based Ink Interactions with a Paper Surface

The effects of filler and coating on the behaviors of water and oil-based ink on the paper surface were investigated. Fillers reduced the air permeability and surface energy hence increased the liquids uptake. The coating was more effective than the internal addition of fillers for the improvement of water and ink absorption. Sizing interfered with the fillers, but had negligible effects on the movements of oil-based ink on papers. The quality of coating in terms of printing performance was dependent on the improvement of surface smoothness, microcapillary formation and the absorption properties of fillers in the coating layer.

Evaluation of Sound Absorption, Printability, and Some Mechanical Properties of Thin Recycled Cellulosic Sheets Containing Wool, Ceramic Fiber, and Cotton Dust

A number of thin biocomposites were produced from waste corrugated board pulp with 15% and 30% blending of wool fibers (WF), ceramic fibers (CF), and cotton dust (CD), respectively. The highest sound absorption value was obtained from samples containing 30% wool fibers. Printability of control sheets unfortunately was remarkably damaged. Ceramic fibers improved the thermal stability of control sheets, which was followed by WF and CD. Tensile and burst indexes of samples, however, were greatly reduced. It was furthermore found that CD, CF, and WF additions increased the air permeability values of resultant papers parallel to great reduction on densities.

Effects of color mixing components on offset ink and printing process

ABSTRACT In printing, the most important element is to obtain the correct substrate and ink combination. Transparent white and opaque white are used for the lightening of printing inks, but they are also an important component for the mixing of inks. The primary objective of this study was to assess the result of using transparent and opaque white in mineral oil-based offset printing inks on the rheological and printability properties of these inks as well as the ideal mixing ratios in terms of print quality. Transparent and opaque white were added into the standard offset magenta ink variable ratios. Differences in ink viscosity, tack, and flow (rheological) values affect such parameters as adhesion, transferability, and printing stability in these inks. Prints were made on matt-coated papers of the same grammage with these inks, and contact angle, solid ink density, color strength, and print gloss values of these ink films were measured. Color differences () of inks in comparison to the standard ink were calculated and the effects of transparent and opaque white on the rheological and printability properties of the ink were presented. Finally, the ideal mixture ratios of transparent and opaque white into the ink were determined in terms of print quality and recommendations were presented.

Use of nanoparticle binders for paper coatings: A review

The growing interest by many industrial segments to use sustainable materials has stimulated the development of new biopolymer materials. Some of the biomaterials that have a use in papermaking and coating industry are cellulose, coating starches (modified low molecular weight grades of the native material), chitosan, soy protein, alginate, casein, zein, lecithin and cellulose derivatives such as methyl cellulose and carboxymethyl cellulose (CMC), among others (Klass, 2011). Paper grades sometimes need to be coated with these materials to improve paper printability, surface characteristics or to add extra functional properties. Printability is the main quality for high quality colour reproduction, increased ink gloss, uniform appearance or preventing print defects. It is greatly affected by paper porosity since the rate and depth of ink receptivity depends on it. Porosity is measured by the number and size of the voids within the coating layer. The voids can be controlled with different pigments, binder types, dispersing agents and additives in the coating layer.

Effects of matte coating on the paper surface and print density

Abstract In this work, standard laboratory printing applications with IGT (ISO 12647-2) were applied on uncoated and matte-coated papers using offset inks (DIN ISO 2846-1). Surface roughnesses of uncoated and coated sheets were recorded to be 195 and 13 ml/min, respectively. Air permanence values of uncoated and coated papers were found to be 5.6 and 0.103 μm/Pa·s, respectively. Changes in the print densities were recorded up to 48 h. Print density changes for uncoated and matte-coated papers were surprisingly found to be in similar paths (8% in the first 4 h), although significant differences between surface roughnesses were recorded. Furthermore, paper samples showed similar behaviors for the percent volume changes, where drop volume disappeared within 6 min. It is concluded that matte coating did not have any significant effects on print density change and drop volume change.

Utilization of water reed in production of various insulation panels

Abstract Some panels and particleboards were made from reed mats and blends of reed-wood chips to be used inside buildings for sound and heat insulations. It was seen that the outer layers of the reed body (spike) was almost water resistant and exceptionally resistant to the penetration of common adhesives. Therefore, the panels from stitched reed mats exhibited very poor mechanical strength. The sound transmissions of such panels (1–3 km/s) made with various combinations, however, were recorded to be excellent compared with that of particleboards made of wood (17 km/s). Blends of reed chips (2 cm) and wood chips, however, gave particleboards with better mechanical properties (5–17 MPa) than that of panels made from reed mats (2 MPa). An increasing amount of reed chips in tested particleboards was recorded to be improving both sound and heat insulations from 17 to 6 km/s and from 0.34 to 0.27 W/mK, respectively. The bending strength of samples, however, was reduced from 26 to 5 MPa. Thickness swelling was also noted to increase from 18% to 85% due to reed chips addition. It was concluded that the outer layers of water reeds should be modified via chemical and/or enzymatic methods to increase the interfacial bounds between adhesives.