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The composition of mineral particles removed during determination of wet surface strength of coated papers Irene Pettersson, Mikael Rigdahl, Ingrid Fineman and Gunnar Engstrom, STFI, Stockholm Keywords: Coated papers, Surface strength, Wet strength, Coatings, Impurities, X ray analysis. SUMMARY: The wet surface strength of coated paper was measured using a Priifbau-press by determining the number of particles adhering to the printing disk. By means of energy dispersive X-ray analysis it was found that many of the mineral particles removed from the paper

formula on fold cracking has been the subjects of several studies. The properties of coating layer composed of pigments, latexes and others generate considerable research interest, and it is generally accepted that fold cracking of coated papers depends on the properties of coating layer. A model system of a calcium carbonate surface in contact with latex and starch binders was studied by Najafi et al. ( 2019 ) to evaluate the interfacial bonding performance affecting failure in tensile mode, which pointed out that failure at the pigment-binder interface is important

opera- tions. The folding operation of paperboard relies on the ability of the board to internally delaminate in order to enable the relief of the tensile stresses generated on the outside of the fold and thus preventing it from cracking. Accordingly, delamination is a desirable event at folding and can also be observed for papers with sufficiently high thickness. With LWC (light weight coated) papers, observation of the creased region (the cracked line due to the folding ope- ration) under a microscope reveals that the coating on both sides of the sheet is cracked

PAPER PHYSICS Sig n ificance of su rface and bu l k l i g ht scatteri ng i n m icrog loss and microg loss non u n iform ity of coated papers : I nfl uence of p ig ment characteristics and calendering cond itions Tsuyosh i Takahashi and Ramin Farnood KEYWORDS: Microgloss, microgloss nonuniformity, light scattering, coating, coated paper, calendering, kaolin, calcium carbonate, gloss SUMMARY: A custom-made imaging reflectometer was used to study the microgloss properties of coated papers . To quantify the relative contributions of surface and bulk

382 Nordic Pulp and Paper Research Journal Vol 21 no. 3/2006 KEYWORDS: Print rub, Ink scuff, Ink setting, Print rub test, Ink-surface interaction, Printability, Matt paper, Silk paper. SUMMARY: Print rub, or ink scuff, remains one of the greatest challenges for the successful development of matt and silk matt offset coated papers. Using a recently proposed method for evaluating print rub, involving a non-slip pressure and friction-induced stress contact between a printed and unprinted sheet, this work seeks to test a newly-formulated hypothesis that the ability

An investigation of friction mechanisms of paper-to- paper friction of coated papers Peter Rättö KEYWORDS: Abrasion, Adhesion, Coated paper, Coating, friction, Surface roughness SUMMARY: Different friction mechanisms for coated board were investigated. Friction due to adhesive forces, interlocking of asperities and plastic deformation, respect- tively, was evaluated for coated board. The measurements of friction were combined with measurements of surface energy and measurements of gloss variations. The samples coated with only latex showed significant

the data with finite bandwidth (length scale) The influence of different roughness scales of pigment coated papers on print gloss Joakim Järnström, Petri Ihalainen, Andreas Lemström, Martti Toivakka and Jouko Peltonen, Åbo Akademi University, Åbo/Turku, Finland Paper physics 2809 09-09-11 14.13 Sida 327 328 Nordic Pulp and Paper Research Journal Vol 24 no. 3/2009 determined by the short–wavelength (i.e. sampling inter- val) and long–wavelength (i.e. image size) limits. Depending on the wavelength limits, the parameters are not necessarily obtained in the

Nordic Pulp and Paper Research Journal Vol 25 no. 3/2010 319 Coating Effect of base paper grammage and electrolyte content on electrical and dielectric properties of coated papers Kaj Backfolk, Jonas Sidaravicius, Petri Sirviö, Robertas Maldzius, Tadeus Lozovski, and Jarl B. Rosenholm KEYWORDS: Conductivity, Charging, Charge decay, Dielectric, Coated paper, Electrophotography SUMMARY: The effects of base paper grammage and sodium chloride (NaCl) content in the base paper prior to pigment coating were studied with regard to the electrical and

vapour transmission rate is also considered. Experimental Materials Two types of base paper (white top liner and two-ply sack paper) have been used. Both papers had top layers of bleached kraft pulp and bottom layers of unbleached kraft pulp, and were produced on the same paper machine. The grammage of the white top liner (WTL) was 140 g/m2 and that of the two-ply sack paper (SP) was 100 g/m2. The effect of hot calendering of the substrate on the barrier properties of poly(vinyl alcohol)-coated papers Thomas Schuman, Magnus Wikström and Mikael Rigdahl, Chalmers

Chemical composition of coated paper surfaces determined by means of ESCA Goran Strom7) and Gilbert Ccrrlsson, Institute for Surface Chemistry, Sweden Alfred Schulz, Iggesund Paperboard, Iggesund, Sweden Keywords: ESCA, XPS, Coated papers, Latex, Surface proper- ties, Chemistry. SUMMARY: Laboratory coated papers with different pigment compositions (clay and calcium carbonate) and pilot coated papers with different types of latex binders have been charac- terized by electron spectroscopy for chemical analysis (ESCA). The surfaces were very rich in carbon