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Volume 38 (2001)
- Issue 6 Pages 380-
- Issue 5 Pages 282-
- Issue 4 Pages 216-
- Issue 3 Pages 144-
- Issue 2 Pages 72-
- Issue 1 Pages 2-
Volume 38, Issue 4
Displaying 1-5 of 5 articles from this issue
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Hiromi UCHIMURA, Yasushi OZAKI, Minoru KIMURA2001 Volume 38 Issue 4 Pages 216-224
Published: July 31, 2001
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSPenetrability of dyed ink jetted on ink jet printing paper was investigated. Evaluation of printing quality is indispensably needed for development of printing paper and improvement of its quality. In particular, information on penetration behavior in depth direction of ink-paper system is desirable for ink jet printed paper. However, a thin sectioning to prepare specimen by an epoxy-embedding used as the most common method is entirely inadequate for application of ink-paper system because printed ink tends to dissolve into the resin. In this study, smooth crosssections of matte and glossy type ink jet printed papers were created by a focused ion beam method. However, penetration behavior of jet ink into the coated layer could not be directly observed through scanning electron microscope (SEM). Therefore, the dyed ink penetrated into the coated layer was observed by the combination of SEM with optical microscope. Further, non-uniform concentration of the dyed ink in the coated layer was found using the SEM-electron probe micro analyzer combination system. The mechanism of penetrability of the dyed ink was also discussed from ununiformity of ink penetration.View full abstractDownload PDF (4027K) -
Reactivity and Its Evaluation of Organometallic CoatingsIkumi NAKABE, Masatoshi TAKEBAYASHI, Takeshi YASUTOMI, Kazuo FUTAMI, M ...2001 Volume 38 Issue 4 Pages 225-230
Published: July 31, 2001
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSWe investigated reactivity of organic titanium coatings and organic zirconium coatings from the stand point of color developed by the reaction between the coatings and developers (catechol and hydroquinone). Then (1) The relation between the resultant color and reactivity of the organometallic coatings was examined on the basis of the color and IR spectra measurement. (2) The relation between the resultant color and standing time for the organic titanium coatings and organic zirconium coatings was examined on the basis of the color and IR spectra measurement. As a result, color was formed in case of titanium but was not formed in case of zirconium. The color decreased with an increase of the standing time for the organic titanium coatings. We can estimate reactivity of organometallic coatings from the measurement of color formed by the reaction between the coatings and the developers.View full abstractDownload PDF (883K) -
5. Electrorheological Fluids -Application to Imaging Technology-Yasufumi OTSUBO2001 Volume 38 Issue 4 Pages 231-237
Published: July 31, 2001
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSA rapid reversible change in viscosity of fluids on the application or removal of electric fields is referred to as the electrorheological (ER) effect. Typical ER fluids are suspensions of polarizable particles dispersed in insulating oils. In electrified suspensions, the dipole-dipole interactions cause chains of particles in the direction parallel to the field vector. Since the rupture of chains spanning the electrode gap is induced above some critical deformation, the suspension behaves as a solid at low stresses. The chains constructed by highly absorbing particles do not transmit light, while the vacant area without particles is almost transparent. Therefore, the transmittance of suspensions is markedly increased in electric fields. The viscosity change can be applied to liquid toners in electrophotography and the optical change to transmission-controlled windows. When a dielectric fluid with very low conductivity is subjected to high electric fields, the jet-stream is generated, which is known as the electrohydrodynamic (EHD) effect. An ink jet system is also developed by the use of EHD jet. The change of physical properties of fluids in electric fields can provide the basis for new imaging technology.View full abstractDownload PDF (3253K) -
2. Ink Types and Application of Gravure and Flexo InkKoji OHTANI, Mitsuaki HIRATA2001 Volume 38 Issue 4 Pages 238-246
Published: July 31, 2001
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSGravure and flexo ink is classified into solvent ink, water based ink and non-solvent ink such as radiation curing ink. Generally almost all types of gravure and flexo ink are similar in compositions, containing organic and inorganic pigments, resins, solvents and various agents such as waxes and defoamers. Among of these compositions, resins and solvents are important to print on various substrates. Those are a little different between gravure ink and flexo ink. Gravure ink uses various natural and synthetic resins such as modified rosin, nitrocellulose, polyamide, vinylchloride-vinylacetate co-polymer, polyester, polyurethane, acrylic resin and the others, so that gravure ink is applicable to various substrates. On the other hand, resins and solvents for flexo ink are restricted because some solvents damage flexo printing plates and fountain rollers. Recently in Japan, laws related to environmemtal protection and working conditions tend to be stricken with gravure and flexo printing. In consideration of global environmental protection and working conditions, the development of non-toluene ink and water-based ink will be pursued rapidly and in order to get proper products, higher technology will be necessary to develop new gravure and flexo ink.View full abstractDownload PDF (1936K) -
[in Japanese]2001 Volume 38 Issue 4 Pages 247-260
Published: July 31, 2001
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSDownload PDF (9153K)
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