All issues
Volume 26 (1989)
- Issue 6 Pages 288-
- Issue 5 Pages 226-
- Issue 4 Pages 159-
- Issue 3 Pages 114-
- Issue 2 Pages 64-
- Issue 1 Pages 3-
Volume 26, Issue 2
Displaying 1-5 of 5 articles from this issue
- |<
- <
- 1
- >
- >|
-
Tsuyoshi SANADA1989 Volume 26 Issue 2 Pages 64-72
Published: March 31, 1989
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSA little more than 10 years have passed since the waterless offset plate was announced in Japan. As print quality differences among various printing companies are getting smaller due to the prevalence of highly automated presses and advanced related materials, the waterless plate is now gaining attention more than ever before. This paper describes adout the merits and demerits of waterless offset system compared mainly from the standpoint of printing with the conventional wet offset system and slso gives a view of this waterless printing system in the near future.View full abstractDownload PDF (2765K) -
Toshikazu UCHIDA, Shozo SAWADA1989 Volume 26 Issue 2 Pages 73-77
Published: March 31, 1989
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSHigh-photosensitive polymer, poly (vinyl cinnamoyl acetate) (PVCiA) was synthesized by esterification of poly (vinyl alcohol) with monochloroacetic acid, followed by reacting poly (vinyl monochloroacetate) (PVChA) and potassium cinnamate. From the investigate on of sythetic conditions of PVChA, it was found that esterification of poly (vinyl alcohol) with monochloroacetic acid and the successive cinnamoyl acetoxyl esterification of PVCiA can be successfully controled. Monochloroacetoxyl esterification value of PVChA and cinnamoyl acetoxyl esterification value of PVCiA were determined by 1H-NMR (200MHz). The relation ship of the degree of cinamoylacetoxyl esterification of PVCiA and photosensitivity was dem onstrated.View full abstractDownload PDF (491K) -
Yukihiro ARAI, Takeshi AGUI, Masayuki NAKAJIMA1989 Volume 26 Issue 2 Pages 78-84
Published: March 31, 1989
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSThe technique of reversible compression coding for images of computer graphics (CG) is important in graphic systems where it is inconvenient to predetermine distortion allowances, such as image data base systems. The authors have already proposed Structure Runlength Coding (SRC) and Boundary Detection Coding (BDC), which are reversible coding schemes for CG images. Those schemes use the characteristics of CG images of having many uniformly colored areas. They compress the configuration of uniformly colored areas rather efficiently. Color signals are, however, coded without any compression measures: if a given image has twenty-four bits for a pixel, the codes use the same bit pattern for the colors of areas. The present paper proposes an FIFO buffer scheme which compresses color signals efficiently. Using an FIFO buffer, some colors in an image can be coded indirectly with the addresses of the colors in the buffer. The FIFO scheme will be built in SRC scheme and BDC scheme, making both of the coding schemes more efficient. Using a buffer of suitable sizes, the sample images in our experiment are compressed about 10% in average to the original size, while the compresion ratio of the prototype schemes are around 15%.View full abstractDownload PDF (1993K) -
Asao FUKUURA, Riichiro KUSAKI1989 Volume 26 Issue 2 Pages 85-94
Published: March 31, 1989
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSSome alkyd resins with acryloyl functional groups through urethane bond were synthesized to get vehicles for inks whose surfaces were cured by UV irradiation to prevent blocking and set-off of next paper, and whose inner parts were cured by oxidation. Then their UV curing reaction and oxidative reaction were analyzed by infra-red absorption spectra. We found that acryloyl functional groups can be also polymerized by the radicals from oxidation process of unsaturated fatty acid groups of alkyd resins. Therefore UV curable and oxidative polymerizable inks, which consisted of acrylates, alkyd resins, phtoinitiators, oxidative driers, inhibitors, and pigments, were developed successfully. And oxidative polymerization rate could be controlled by adding inhibitors such as p-methoxyphenol and the like.View full abstractDownload PDF (1092K) -
Basic Course (2) Spectral Reflectance CurveToshio ICHIMI1989 Volume 26 Issue 2 Pages 95-102
Published: March 31, 1989
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSThe colors of printed matters can be expressed scientifically in the form of spectral reflectance curves measured by spectrophotometer. These curves are converted tristimulus values X, Y, Z, or chromaticity coordinates x, y. These values can also be read directly by photoelectric colorimeter. The shape of spectral reflectance curves indicates each color specifications (hue, value, chroma, etc), and explains the principles of additive mixture of color stimuli or subtractive mixture of colorants.View full abstractDownload PDF (2225K)
- |<
- <
- 1
- >
- >|