Interactions of ink and water with the paper surface in printing

Aspler, J. S.

doi:10.3183/npprj-1993-08-01-p068-074

Cited by 26 publications

(13 citation statements)

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“…By examining the surface profiles of the different sheets, which are shown in figure 10, it can be estimated that the Ø m parameter as defined by equation [2] will assume values for the roughest sheets of 5-10 º, which is in close agreement with what is shown in figures 9 a-c. By inspection of equation [1] to [3] it is clear that they are most applicable for surfaces with a contact angle lower than 90 º but the concept introduced with the equations are nevertheless very useful. It is naturally also hard to exactly define when there is a changeover from increased spreading to decreased spreading due to the increased roughness but it is interesting to note that both the hydrophobicity and the roughness will influence the spreading of the water drops on the sized sheets.…”

Section: Fscn/teknisk Fiberkemisupporting

confidence: 75%

“…Two types of paper sheets were prepared to study the influence of bulk structure on the spreading and absorption of different liquids; two-layer sheets, 40+40 g/m 2 , and homogenous sheets, 80 g/m 2 (figure 1). The sheets were prepared from a TCF pulp (hardwood) delivered in dry lap form from SCA Graphic Östrand, Sundsvall, Sweden.…”

Section: Methodsmentioning

confidence: 99%

“…(| dh/dR|) = Maximum slope of the roughness on the surface [2] For the small scale roughness it can be suggested that the imprinted pattern forms a continuous network of surface capillaries which actually assists in the spreading of the drops of water according of the Wenzel equation (see for example 14)…”

Section: Fscn/teknisk Fiberkemimentioning

confidence: 99%

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Spreading of droplets of different liquids on specially structured papers

Wågberg

Westerlind

2000

Nordic Pulp &Amp; Paper Research Journal

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Section: Fscn/teknisk Fiberkemisupporting

confidence: 75%

Section: Methodsmentioning

confidence: 99%

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Spreading of droplets of different liquids on specially structured papers

Wågberg

Westerlind

2000

Nordic Pulp &Amp; Paper Research Journal

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“…Conceptually, (2) and (3) decompose the measurement procedure into two steps, in which (2) specifies a filtering procedure, where g(i, j) is the filter output and (3) estimates the energy level of the filtering result. The calculation of (2) is essentially a band-pass filtering.…”

Section: Proposed Mottle Spatial Frequency Rangementioning

confidence: 99%

“…It is intuitively associated with graininess or color unevenness, especially in the areas of uniform solid color. Print mottle is influenced by many factors including printing engine, ink/toner, and printing media [2,3]. Mottle estimation is crucial in image quality assessment and system diagnosis.…”

Section: Introductionmentioning

confidence: 99%

Robust estimation of print mottle

Fan

Dalal

et al. 2008

SPIE Proceedings

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Mottle is a common defect in printing. Mottle evaluation is crucial in image quality assessment and system diagnosis. In this paper, we present a new automatic mottle estimation method which improves the existing technologies in two aspects. First, a modified mottle noise frequency range is proposed, which further separates the banding and streak spectra from mottle spectrum. Second, a robust estimation algorithm is introduced. It is less sensitive to the outliers that may appear in the measurement. These outliers include other defects within the mottle frequency range, such as spots, or defects outside of mottle frequency range, but are strong enough that can not be completely eliminated by normal spatial filtering.

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Numerical and physical modeling of the permeability of paper to CMC and coating liquids

Poulin

Tanguy

Aspler³

et al. 1997

Can J Chem Eng

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The penetration of CMC solutions and coating liquids into paper sheets was investigated experimentally and modeled using a Lucas-Washburn equation (Lepoutre, 1978) adequately modified to account for the dynamic contact angle and the coating fluid rheology. A numerical simulation of the fluid penetration based on the finite element resolution of the Navier-Stokes equations was carried out as well. The numerical predictions and the predictions of the Lucas-Washburn equation were compared with the experimental data showing the limitations of the models. oating is a widely used process in the paper industry to C enhance the appearance and printability of papers. It consists of applying a thin layer of mineral slurry on the basesheet, which is subsequently finished by drying and soft calendering. The main ingredients of a typical coating liquid (called coating color) formulation are water, pigments, adhesives, and a number of processing aids. During the application process, the interaction between the coating color and the web results in color penetration into the basesheet, which affects the quality of the coat layer and therefore the coated paper. A good knowledge of this phenomenon is essential to control the quality of the final product. The main parameters affecting the degree of penetration are the porosity of the basesheet, its permeability, the surface tension and the contact angle (Kent and Lyne, 1989).Paper sheets are composed of fibers having a wide range of thickness, shape and length. Their arrangement in a ran-

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Interactions of ink and water with the paper surface in printing

Cited by 26 publications

References 0 publications

Spreading of droplets of different liquids on specially structured papers

Spreading of droplets of different liquids on specially structured papers

Robust estimation of print mottle

Numerical and physical modeling of the permeability of paper to CMC and coating liquids

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