Article,

Engineering An Ink Jet Paper: What is Involved?

, , and .
(1996)

Abstract

People use paper to communicate ideas. Because customers prefer ” plain” rather than specialty papers, ordinary copy paper is commonly used in ink jet printers. While most plain papers perform well in copiers and laser printers, performance varies considerably with ink jet printers. Why is this? Copy paper was originally designed for electrophotographic imaging systems, not aqueous, water-based ones. Physical properties for ink jet and xerographic papers differ considerably. Our paper focuses on the basic principles for engineering an ink jet sheet. Specifically, we deal with two issues: (1) What key image quality attributes are important and how are they measured?, and (2) How do we engineer a sheet to optimize them? printer (Winslow & Lee). The results suggest that laser printing is essentially paper independent - there are no significant differences in image quality. Ink jet printing however, still depends on paper. Printer, ink, and paper form the three basic components of a printing system (see Figure 3) (Lee). The systems concept is important since overall performance is governed by its weakest component. Despite tremendous advances in ink jet technology, paper still remains the weak link. Ink jet images are made up of small drops of waterbased ink delivered ballistically to the sheet. Aqueous inks consist of many additives: e.g., water soluble dyes, humectants, biocides, buffers, and chelating agents. After reaching the surface, there is a delay before capillary flow forces it to migrate into the sheet. Delay time is a function of the hydrophobicity of the sheet. Water in the ink then starts to evaporate while diffusion and sorption wet the surface of the fibers (see Figure 4). After wetting capillary flow occurs until the drop has completely penetrated and is dry. During this phase, ink flow can spread laterally as well as down into the sheet. Wetting, penetration, and spreading are therefore the three major mechanisms making up the ink/paper interaction. This paper deals with two topics important to ink jet printing. Part I discusses critical image quality attributes and their measurement. Part II reviews available techniques for engineering an ink jet paper.

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