Journal of Printing Science and Technology
Online ISSN : 1882-4935
Print ISSN : 0914-3319
ISSN-L : 0914-3319
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Volume 30, Issue 4
Displaying 1-5 of 5 articles from this issue
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  • Special Reviews (I): Measurment and Evaluation in Printing Processes
    (3) Measurment and Evaluation Method in Coating Technology Rheological Evaluation Method of Paint Liquid
    Takanobu UEDA
    1993 Volume 30 Issue 4 Pages 226-232
    Published: July 31, 1993
    Released on J-STAGE: September 27, 2010
    DOIhttps://doi.org/10.11413/nig1987.30.226
    JOURNAL FREE ACCESS
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    Some rheological evaluation methods have been reported in this paper. Rheological properties of paint liquid are relation to performance of coating. There are two type of rheological evaluation method, one is for working-level and others is for research-level. Rheological evaluations for working-level are done by the Puddle viscometer (Stomer viscometer) and the Capillary viscometer (#4 Ford Cap), which are mainly used for administration of coating. Rheological evaluations for research-level are also done by the Bob-Cilinder type viscometer (B-type viscometer), the Cone-Plate type viscometer (E-type viscometer) and the Rheometer. These are used for research of formulation of paint liquid. Additionally, some analysis methods such as Casson Plot have been menntioned in this paper.
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  • Special Reviews (I): Measurment and Evaluation in Printing Processes
    (3) Measurment and Evaluation Method in Coating Technology Measuring and Evaluation Methods of Coating and Ink Films
    Nagayuki WATANABE
    1993 Volume 30 Issue 4 Pages 233-243
    Published: July 31, 1993
    Released on J-STAGE: September 27, 2010
    DOIhttps://doi.org/10.11413/nig1987.30.233
    JOURNAL FREE ACCESS
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    These days, in addition to the decoration and protection of substrates, various functions are requested for the films formed by coatings and inks, and many new types of such coatings and inks are developed. In the course of the development of these coatings and inks, new measuring and evaluation methods are also developed one after another. In a way, it can be said that these new measuring and evaluation methods have improved the performance of coatings and inks. Coating and ink films are the combinations of inorganic and organic compounds and are complicated heterogeneous elastomers. New rheological measuring and evaluation methods are compared with conventional measuring and evaluation methods.
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  • The History of Full-color Image Output in Photography and Various Printing Technologies
    Satoru HONJO
    1993 Volume 30 Issue 4 Pages 244-251
    Published: July 31, 1993
    Released on J-STAGE: September 27, 2010
    DOIhttps://doi.org/10.11413/nig1987.30.244
    JOURNAL FREE ACCESS
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    The paper compares the history of printing, photography and digital hardcopy from the viewpoint of color recording. Digital prints as well as painting in color appeared relatively early in their histories. In contrast, color photography was realized a century after the invention of monochromatic photography. Printing, which is another system only for image display, in color appeared immediately after the invention of Gutenberg with help of human manual operation at the plate preparation. All of these facts strongly indicate, i) the paticular difficulty of image capture for live scenes and also ii) the ease with which systems based on scanning output record color. The similarity of the information processing of human being and that of plate preparation in printing is also stressed.
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  • Reproducing Image in Printing
    An Image Reproduction Theoey in Printing interpreted in terms of Light Absorption Ratio
    Michitaka NONAKA
    1993 Volume 30 Issue 4 Pages 252-259
    Published: July 31, 1993
    Released on J-STAGE: September 27, 2010
    DOIhttps://doi.org/10.11413/nig1987.30.252
    JOURNAL FREE ACCESS
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    It is generally said that the principle of color reproduction on printing and photography depends on subtractive color mixture. For instance, printed solid of the color patch is available to explain using the principle. But the principle has not been almost explained to the color printing constructed by halftone dots that four colors are used. Microscopically, that of the hafltone process is led to Neugebauer's equation and the color reproduction can be divided by subtractive color mixture and additive color mixture partially. It is proved in this paper that the principle of color printing reproduction made with halftone dots depends on the subtractive color mixture macrocospically. As a result, the fundamental equation adding the term of black dots and the term of white paper into the Pollak's equation is proposed for the printing process.
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  • Reproduced Color Estimation by Means of Real Conerage Ratio Measured by Dot Image Analysis
    Junji CHIDA, Tomonori YUASA, Hiromichi MISHINA
    1993 Volume 30 Issue 4 Pages 260-265
    Published: July 31, 1993
    Released on J-STAGE: September 27, 2010
    DOIhttps://doi.org/10.11413/nig1987.30.260
    JOURNAL FREE ACCESS
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    The true dot coverage area measured by dot image processing and analysis are used with Neugebauer equation to evaluate reproduced color for taking acount of various effect of printing condition. The color coordinate deduced by above method is compared with colorimetrically measured value. The result of analysis about the difference between measured and calculated color sugests that the necessity of additional consideration of the optical color dot-gain to Neugebauer equation.
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