Recently bubble jet printer becomes very popular for colour printer that has best print quality. In this paper, I would like to express, how to control the quality of bubble jet print in our history. Bubble jet print quality depends on ink property and paper characteristics.

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An innovative media “PICTORICO” for ink-jet printers has been developed which enables users to create photo-realistic digital image. This was achieved by coating synthesized fine alumina particles on-a variety of substrates such as paper, film, fabric, cork, metal plate, etc. The alumina layer on a substrate has the following properties which are critical to achieve high resolution and durable image using ink-jet printers. (1) Quick ink absorption, (2) Perfectly round dot shape, (3) Transparent, (4) Supreme water resistance, To obtain these properties, carefully designed alumina particles are required. Maximum particle size and mean pore diameter are controlled to be less than 200 angstrom in order to get transparent ink receptive layer. This smallness of the pore does not sacrifice ink absorbing capability of the layer, because the particles are stik-like shape and highly oriented to the same direction. Perfect round dot shape attributes to small and uniform pore structure of the layer. The alumina particle has large surface area to disperse uniformly and capture firmly dyes in the ink, which realizes original deep color of the colorants and extraordinary durability against water. Even after imaging, the alumina layer does not lose surface gloss at all because of its strong waterfastness. These features above combined, it is possible to realize extremely high quality image with ink-jet printers.

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Last year, 600dpi serial thermal transfer printer called Micro Dry Process (MDP) is released. It renew image of previous thermal transfer printing. We get a lot of opinions about printing quality from people in the printing business. Recently, color ink jet printer spread rapidly. But developing to represent printing quality close to ofset printing is watched by the printing business. 600dpi serial thermal transfer printing we developed has a possibility that using this printing method, printing quality close to that of ofset printing can be achieved. MD2000/J that introduce here is serial high definition color thermal printer based on MDP technology and we introduce the newest thermal transfer printing called MDP.

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The motion of the sheet of paper which falls down freely, is analyzed by the method of dynamics. In the previous work, we discussed the motion of the sheet of paper which goes inside the delivery unit of printing machine and rotates around a cylinder. In those cases, no outer force was considered except the force pulling the edge of a sheet of paper. In this work, we considered the outer forces, gravity force and fluid force. Generally, the analysis of the flow around the object is very complicated, and the fluid force affecting the object is difficult to solve. So, we analyzed the fluid force by considering the flow momentum. In this work, we analyzed the case of a sheet of free falling paper. In the future work, we are going to adopt the method discussed in this work to the sheet of paper which goes inside the printing machine.

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In halftone dot printing, the printing quality depends on reproduction of halftone dots which is affected by surface roughness of paper and rheological properties of ink and other. In this study, shape and reproduction of halftone dots are evaluated by a method of fractal analysis using a fractal dimension of envelope edge of halftone dot, quantitatively. The fractal dimension of edge for completed dot is close to unity. From experimental result, it is concluded as following: In case of larger area ratio of halftone dot, the distribution of fractal dimension is small, and the reproduction of halftone dot is better. Moreover, for using smooth paper, the fractal dimension shows small value and halftone dot is exactly reproduced, comparatively. Further, for using ink of higher viscosity, the reproduction of halftone dot is better, however the ratio of area where ink was not transferred is larger for the rougher paper. (Key words: Fractal Dimension, Halftone Dot, Paper, Ink, Reproduction)

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There has been a topical advance in electrophotographic imaging and marking system as regards copy or print quality. Its main reason is a progress in digital technology, in particular, image processing system and motion quality control system. In this report, an introduction to digital color copy machine and printer is described as a typical example of recent toner marking technology and its application.

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