Journal of Printing Science and Technology
Online ISSN : 1882-4935
Print ISSN : 0914-3319
ISSN-L : 0914-3319
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Volume 35, Issue 4
Displaying 1-5 of 5 articles from this issue
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  • A Preview of Imaging Systems in the 21st Century
    W. LONG John
    1998 Volume 35 Issue 4 Pages 174-188
    Published: July 31, 1998
    Released on J-STAGE: September 27, 2010
    DOIhttps://doi.org/10.11413/nig1987.35.174
    JOURNAL FREE ACCESS
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    Desktop publishing was introduced in 1985 and matured to become standard industry practice for digital prepress workflow in less than 10 years. At Drupa in 1995 many digital output systems were previewed, including computer-to-plate, computer-to-press and digital printing technologies. Today, computer-to-(plate, press, print) technologies are maturing as commercial products and are having a major impact on the printing industry in a time frame of less than 5 years. This talk will review the current status of technology developments in prepress workflow, digital plates and platesetters, and the latest developments in direct-to-press and digital printing. The status of current technologies will be used as a basis to forecast developments in imaging systems and printing technology over the next several years and into the 21st century.
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  • Optical Dot Gain Analysis by The Measured Point Spread Function of Paper
    Shinichi INOUE, Norimichi TSUMURA, Yoichi MIYAKE
    1998 Volume 35 Issue 4 Pages 189-196
    Published: July 31, 1998
    Released on J-STAGE: September 27, 2010
    DOIhttps://doi.org/10.11413/nig1987.35.189
    JOURNAL FREE ACCESS
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    It is well known that optical dot gain effect in halftone image is caused by the light scattering in the printing paper. The phenomenon has been explained by Yule-Nielsen equation. However, factor n in the Yule-Nielsen equation is an empirical value, therefore it is not possible to obtain n directly. Some theoretical models have been studied to predict reflection density in a halftone image. The light scattering phenomenon is represented by the Point Spread Function (PSF) of paper in their models. In this paper, a new technique was introduced to measure the PSF of paper accurately and the obtained PSFs were used to predict reflection density of the halftone image. This result indicated that the predicted density is approximately same as the measured density in the halftone image, and the estimated optical dot gain is well correlated to the measured optical dot gain. The Yule-Nielsen equation was also analyzed by using the model.
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  • Evaluation of W/O Emulsion Ink Permeation into Paper by Photoacoustic Measurement
    Ichiro MATSUSHITA, Hisanori OGASAWARA, Masahisa SATOH, Sachio YOSHIHAR ...
    1998 Volume 35 Issue 4 Pages 197-201
    Published: July 31, 1998
    Released on J-STAGE: September 27, 2010
    DOIhttps://doi.org/10.11413/nig1987.35.197
    JOURNAL FREE ACCESS
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    Photoacoustic measurement was applied to the monitoring of ink permeation into paper. As oil ink permeated into paper, PA signal decreased. The patterns of PA signal come out to be linear against the square root of elapsed time. This suggests that the PA signal follow the Lucas-Washburn equation. As W/O emulsion ink permeated into paper, the PA signal also decreased. And the W/O emulsion with larger viscosity showed slower PA signal decreases. But its PA signal change did not show as to be linear against the square root of elapsed time.
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  • Surface Modification of Plastics. 1
    Surface Characteristics of Polymeric Materials and Their Modification
    Kazuyuki SUGITA
    1998 Volume 35 Issue 4 Pages 202-210
    Published: July 31, 1998
    Released on J-STAGE: September 27, 2010
    DOIhttps://doi.org/10.11413/nig1987.35.202
    JOURNAL FREE ACCESS
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    Polymers are widely used as imaging/image-supporting materials for graphic arts, copying, photography, information recording, and data accumulation for memories and displays.
    Since the polymers are mostly utilized in the form of a sheet or coating in contact with other inorganics or organics, the surface characteristics are essential performances for the materials, including wettability, adhesion/releasing, permeability, swelling, dispersibility, abration, and statistic charging. In this article are first reviewed evaluation methods of wettability which is a necessary condition for several surface characteristics, and then principles of surface modification will be surveyed as an introduction to the articles appearing on the successive issues of this Bulletin.
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  • [title in Japanese]
    Satoshi TASAKI
    1998 Volume 35 Issue 4 Pages 211-213
    Published: July 31, 1998
    Released on J-STAGE: September 27, 2010
    DOIhttps://doi.org/10.11413/nig1987.35.211
    JOURNAL FREE ACCESS
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