Author

Ramakrishnan

Date of Award

12-1999

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Margaret K. Joyce

Second Advisor

Dr. Dan Fleming

Third Advisor

Dr. Alexandra Pekarovicova

Access Setting

Masters Thesis-Open Access

Abstract

The use of fumed metallic oxides for glossy ink jet media offers alternatives to expensive cast coated and extruded film methods. Fumed metallic oxide pigments provide a high internal porosity and packing porosity that enable the rapid diffusion of liquid inks into the coating layer. Their small particle size (0.1-0.3μm), enable the development of gloss. However, calendering is needed to develop gloss values in the range of cast coated and extruded film grades.

Calendering of coated sheet reduces production speed, adds additional handling and rewinding cost (if performed off-line) and reduces the bulk and porosity of the coating layer, consequently reducing the coating's absorptivity. This study focuses on developing gloss without calendering. Factors, which influence gloss such as basesheet roughening, binder level, and smoothness, were examined.

The objectives of the research were to improve the gloss of the coated media through basesheet modifications and coating optimization. The results showed gloss to be significantly influenced by calendering. Significantly higher gloss was obtained for the alumina pigment than the silica pigments. The gloss value of the alumina pigment was found to be comparable to commercially produced papers. The optical properties of the coatings were not influenced by coat weight.

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