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Full-Text Articles in Engineering
Coating Component Migration In Paper Coatings, Emilia Purington
Coating Component Migration In Paper Coatings, Emilia Purington
Electronic Theses and Dissertations
In many applications such as in paints and coatings, pigments are mixed with polymeric binders to generate the final product. In the coating of paper, properties like strength, durability, and print quality are affected not only by the binder type, but the final location of the binder relative to the pigments and the fibers. During the application and drying of a paper coating, binder is known to migrate. A number of methods are available to measure the migration of latex or starch. However, all of these methods have some limitations, especially when starch, latex and kaolin are components of the …
Cellulose Nanofibers Use In Coated Paper, Finley Richmond
Cellulose Nanofibers Use In Coated Paper, Finley Richmond
Electronic Theses and Dissertations
Cellulose Nanofibers (CNF) are materials that can be obtained by the mechanical breakdown of natural fibers. CNF have the potential to be produced at low cost in a paper mill and may provide novel properties to paper, paper coatings, paints, or other products. However, suspensions have a complex rheology even at low solid contents. To be able to coat, pump, or mix CNF at moderate solids, it is critical to understand the rheology of these suspensions and how they flow in process equipment; current papers only report the rheology up to 6% solids. Few publications are available that describe the …
Gloss Development Of Spray-Coated Systems, Aaron W. Clark
Gloss Development Of Spray-Coated Systems, Aaron W. Clark
Electronic Theses and Dissertations
A spray-coated system involves any substrate on which a liquid coating is applied in a drop-wise fashion. Inkjet printing is the controlled application of drops to print a surface and is the focus of this work. The gloss of the printed substrate is an important attribute of print quality. Print gloss depends on a number of factors, such as ink and media properties. Non-uniform gloss in different regions of a printed image can cause a decrease in quality of a printed sample. However, a good understanding of the gloss development of spray-coated systems is not available in the literature. Several …
Mechanisms Of Print Gloss Development With Controlled Coating Structure, Sung Jai Jeon
Mechanisms Of Print Gloss Development With Controlled Coating Structure, Sung Jai Jeon
Electronic Theses and Dissertations
Paper gloss and print gloss have long been the subject of research because of their strong influence on end-use performance such as image clarity, contrast, and resolution. This work focuses on the significance of the structural factors of porous coatings on print gloss development in a systematic way to elucidate the governing mechanisms. The coating roughness, porosity, and pore size were the three experimental variables. Generation of well defined model coating structures was a challenge and required the appropriate combinations of pigment, binder, and calendering conditions. Calendering techniques with rough substrates (polyester films) were found to produce various rough surfaces …
Application Of Raman Techniques For Paper Coatings, Shivashanker Bitla
Application Of Raman Techniques For Paper Coatings, Shivashanker Bitla
Electronic Theses and Dissertations
Paper coatings are mixtures of pigments, binders and other additives used to improve the optical and printing properties of paper. During application, particle migration may occur resulting in a non-uniform distribution of pigments and binders. This may influence product quality. Raman spectroscopy is a potential tool to characterize coatings in terms of pigment/binder and pigment/pigment distribution. However, there is little work reported on this topic. Various coatings were applied to model substrates, dried and analyzed with Raman spectroscopy. CaC03 pigment and Styrene Butadiene latex binders are easy to detect and monitor in paper coatings when kaolin clays are not …
The Influence Of Fiber Swelling On Paper Wetting, Sedef Akinli-Kocak
The Influence Of Fiber Swelling On Paper Wetting, Sedef Akinli-Kocak
Electronic Theses and Dissertations
The water uptake behavior of fibers, especially those at the surface of paper, influences printing and coating operations. The dynamic water uptake behavior of the surface fibers may determine the initial consolidation of the coating at the surface and the penetration of coating into the paper, but clear studies on this topic have not been reported in the literature. Four different fiber types and seven different paper sheets were investigated in the present study. The three different fiber types were prepared by carboxymethylation of softwood kraft pulp thereby producing pulps with different water uptake values. The fiber length and water …
The Influence Of Process Parameters On Filament Size Distribution, Saybil Nuray Ercan
The Influence Of Process Parameters On Filament Size Distribution, Saybil Nuray Ercan
Electronic Theses and Dissertations
Filaments are formed at the exit of rolling nips in some coating and printing operations. The filament size distribution can determine product quality such as gloss. The average filament size is linked to operational difficulties such as misting. The filament size distribution of various fluids and inks is characterized and compared to theoretical model. A high-speed video camera is used to visualize the exit of a rolling nip. The size distribution of the filaments is characterized with image analysis. A laboratory print tester is used with the high speed camera to characterize the size of the defects right after printing. …