Wettability of model fountain solutions: The influence on topo-chemical and -physical properties of offset paper

Tåg, Carl-Mikael; Pykönen, Maiju; Rosenholm, Jarl B.; Backfolk, Kaj

doi:10.1016/j.jcis.2008.10.058

Cited by 16 publications

(15 citation statements)

References 23 publications

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“…This polar component is related to the cellulose wettability with water. Thus, material with a high γ p has greater affinity for water, resulting in low static contact angles [31,42,43]. Figure 2 shows the relationship between polar component and static contact angle with water (α w ).…”

Section: Resultsmentioning

confidence: 99%

“…The influence of surface topography in the contact angle has been rather reported by several authors, who recommended using the Wenzel´s roughness correction [31,32,33]. The Wenzel Equation (2) establishes that the relationship between the measured contact angle (α m ) and the corrected angle in an ideal flat surface (α c ) may be written as follows:

\cos α_{m} = r \times \cos α_{c}

where r is the topographical correction factor Equation (3) obtained as:

r = 1 + \frac{S d r}{100}

where Sdr is the developed interfacial area ratio provided by atomic force microscopy (AFM).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Modification of Bacterial Cellulose Biofilms with Xylan Polyelectrolytes

Santos¹,

Carbajo²,

Gómez³

et al. 2017

Bioengineering

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The effect of the addition of two [4-butyltrimethylammonium]-xylan chloride polyelectrolytes (BTMAXs) on bacterial cellulose (BC) was evaluated. The first strategy was to add the polyelectrolytes to the culture medium together with a cell suspension of the bacterium. After one week of cultivation, the films were collected and purified. The second approach consisted of obtaining a purified and homogenized BC, to which the polyelectrolytes were added subsequently. The films were characterized in terms of tear and burst indexes, optical properties, surface free energy, static contact angle, Gurley porosity, SEM, X-ray diffraction and AFM. Although there are small differences in mechanical and optical properties between the nanocomposites and control films, the films obtained by BC synthesis in the presence of BTMAXs were remarkably less opaque, rougher, and had a much lower specular gloss. The surface free energy depends on the BTMAXs addition method. The crystallinity of the composites is lower than that of the control material, with a higher reduction of this parameter in the composites obtained by adding the BTMAXs to the culture medium. In view of these results, it can be concluded that BC–BTMAX composites are a promising new material, for example, for paper restoration.

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Section: Resultsmentioning

confidence: 99%

\cos α_{m} = r \times \cos α_{c}

where r is the topographical correction factor Equation (3) obtained as:

r = 1 + \frac{S d r}{100}

where Sdr is the developed interfacial area ratio provided by atomic force microscopy (AFM).…”

Section: Methodsmentioning

confidence: 99%

Modification of Bacterial Cellulose Biofilms with Xylan Polyelectrolytes

Santos¹,

Carbajo²,

Gómez³

et al. 2017

Bioengineering

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“…Consider (Fig. 8) that liquid surface sizing agents alkenyl succinic anhydride (ASA) and alkyl ketene dimer (AKD), as well as diiodomethane and formamide represent oil based inks, while water and ethylene glycol represent fountain solution (offset printing plate wetting solution) [5]. Alternatively, ASA and AKD represent surface sizing liquids for the papers.…”

Section: Spreading On Rough Surfacesmentioning

confidence: 99%

“…Due to its complexity, less attention has been directed towards rough, chemically heterogeneous polar surfaces. In a series of investigations we have applied probe liquids and inks onto pigment coated paper surfaces and have determined the surface energy and its components (Lifshitz-van der Waals, acid and base) at semi-equilibrium conditions [1][2][3][4][5]. In the characterization, due to the large number of uncontrollable parameters, different simplifications of existing models have been evaluated [6,7].…”

Section: Introductionmentioning

confidence: 99%

Radial Spreading of Inks and Model Liquids on Heterogeneous Polar Surfaces

Tåg

Järn

Rosenholm

2010

Journal of Adhesion Science and Technology

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Novel models are developed and previously published simple models characterizing the spreading of probe liquids and inks on solid surfaces are evaluated with water and ethylene glycol. The aim is to determine the most appropriate models which would be suitable to describe liquid and ink spreading on both chemically and structurally heterogeneous paper surfaces. The surface energy and its components (Lifshitzvan der Waals, acid and base) for the paper samples have previously been characterized at semi-equilibrium conditions. The equilibrium work of adhesion and work of spreading is found to be linearly related to the maximum print tack force of model inks. The dynamic spreading are found to be determined by coupled spreading mechanisms, being related both to the surface structure and surface chemistry.

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“…Although it may appear to be highly complicated at the beginning, this process can become considerably simple especially with the fountain solution being taken under control. In order to be able to control the print quality in offset printing, understanding the relations among ink, paper and fountain solution is of great importance (Tåg et al, 2009). In the simplest term, the offset printing system is based on a working principle where printing is performed only after water-receptive and ink-receptive areas are formed on the plate (Deshpande, 2011;Ozcan, 2011).…”

Section: Introductionmentioning

confidence: 99%

examination of printability parameters of �Pa free offset printing

Ozcan¹

2017

J. Graph. Eng. Des.

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Fountain solution system in offset printing system has significant impacts on the printing quality and fountain is the indispensable part of this system. The most important chemical added into the fountain solution is isopropyl alcohol. Fundamental features of isopropyl alcohol are reducing surface tension and adjusting and stabilizing pH. However, in the course of time, the disadvantages of using alcohol have emerged. In the present study, the quality levels of IPA-based and IPA-free offset prints were compared. Specially designed test scale printing was carried out after IPA-based and IPA-free fountain solutions were prepared with the same ink on matt-coated paper under optimal printing conditions. Densitometric and spectrophotometric measurements were carried out on the prints and it was ensured that they were printed in accordance with ISO-12647-2:2013 offset printing standards. Special test scales that were printed were read through scale readers and colour profiles were obtained. Comparisons were carried out on the obtained IPA-free and IPAbased printing colour gamut. Microscopic images of the smallest dots were taken and edge sharpening was examined. Print brightness measurements were carried out for the selected areas on the test scale. The study practically demonstrated that printing performed by using IPA-free fountain solution produced a better and wider colour gamut, edge sharpening was better in the IPA-free systems as the number of prints increased and the prints made by using IPA-free fountain solution were brighter.

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Wettability of model fountain solutions: The influence on topo-chemical and -physical properties of offset paper

Cited by 16 publications

References 23 publications

Modification of Bacterial Cellulose Biofilms with Xylan Polyelectrolytes

Modification of Bacterial Cellulose Biofilms with Xylan Polyelectrolytes

Radial Spreading of Inks and Model Liquids on Heterogeneous Polar Surfaces

examination of printability parameters of �Pa free offset printing

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