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Evaluation of Printing Papers for Thermal Transfer Printers Based on Real Contact Area Using a Contact Microscope

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  • 真実接触面積による印刷用紙の印字濃度評価
  • シンジツ セッショク メンセキ ニ ヨル インサツ ヨウシ ノ インジ ノウド ヒョウカ

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Abstract

The thermal transfer print method is to print ink on the surface of paper by pressurizing ink and paper directly with a thermal head, and heating the places to print. A principle of the thermal transfer printing is similar to that of the offset printing. A tribological contact problem occurs in the offset printing. Thus the thermal transfer printers are suffering from the similar contact problem between the ink and the paper since the surface of the plain paper has roughness and it is very difficult to make the contact situation constant at all time. It is necessary to deeply understand the contact between paper and the solid ink to achieve the high-resolution printing on even the rough plain paper. So far the stylus type and the laser type profilometers were used to evaluate the printing quality for various papers. However there is no attempt to examine the printing quality, optical density, from the view point of real contact area. Then, the relationship between the optical density and the real contact area on the paper side was experimentally obtained in this paper with a contact microscope. As a result, the correlation could be found between the optical density and the real contact area.

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