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Volume 42, Issue 10
Displaying 1-10 of 10 articles from this issue
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Kenzo Sakamoto1988 Volume 42 Issue 10 Pages 901-907
Published: 1988
Released on J-STAGE: November 16, 2009
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Process Control And Automation Committee1988 Volume 42 Issue 10 Pages 908-916
Published: 1988
Released on J-STAGE: November 16, 2009
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Bong-Yong Kim1988 Volume 42 Issue 10 Pages 917-922
Published: 1988
Released on J-STAGE: November 16, 2009
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Masao Takahashi, Teiji Sato, Masahide Ogawa1988 Volume 42 Issue 10 Pages 923-932
Published: 1988
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSA marked development of ink jet printing system is expected in a color copying. Peculiar properties required for an ink jet printing paper are 1) a satisfactory ink-absorbing capacity, 2) uniform shape of dot like true circle, 3) an excellent color performance (density, gloss, hue, and clearness), 4) a prominent light-resisting property, and 5) a favorable surface strength.
When Mizukasil P-78 (or CaO-coated product) of gel type amorphous silica is coated on a surface of the ink jet printing paper, the five factors mentioned above are significantly improved, and an excellent color image can be obtained. Thus the amorphous silica shows an excellent clearness, hygroscopicity and surface dyeing property ; and shows a favorable range of pore distribution, acid strength distribution, density of silanol group and particle size distribution.
It becomes clear that an excellent color image of the ink jet printing paper is how to functionalize the surface of coated layer with due regard to the compatibility of ink with the ink jet printing paper.View full abstractDownload PDF (7598K) -
R. W. Eklund, H. A. LeBlanc, D. G. Halley1988 Volume 42 Issue 10 Pages 933-939
Published: 1988
Released on J-STAGE: April 23, 2010
JOURNAL FREE ACCESSThe continual quest to improve on the end-use performance of existing coated papers and development of new products is a costly effort. Paper companies and suppliers depend on laboratory and/or pilot coater facilities for product improvement and development of new coated paper products. A pilot coater facility can simulate most production conditions. However, it is quite costly to operate and maintain. Most laboratories are equipped to screen coatings but not to simulate high speed blade coating conditions without a high speed pilot coater.
The Cylindrical Laboratory Coater (CLC) helps fill the need between a laboratory and pilot coater. The CLC is a high speed laboratory blade coater which facilitates low cost research and experimentation into coated paper improvements, new product development and coating rheology.
This paper discusses the features of the Cylindrical Laboratory Coater and discusses some studies done with groundwood containing papers.View full abstractDownload PDF (5092K) -
Kyuzaburo Ishiguro1988 Volume 42 Issue 10 Pages 940-946
Published: 1988
Released on J-STAGE: November 16, 2009
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1988 Volume 42 Issue 10 Pages 949-952
Published: 1988
Released on J-STAGE: November 16, 2009
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1988 Volume 42 Issue 10 Pages 952
Published: 1988
Released on J-STAGE: November 16, 2009
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Part 3. Characterization of Pulps Produced by CTMP-O3 ProcessYasuo Kojima, Seung Lak Yoon, Tsutomu Kayama1988 Volume 42 Issue 10 Pages 953-962
Published: 1988
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSHigh yield pulps were produced from hardwoods (birch and oak) by CTMP-O3 process.
Chemical and physical properties of these pulps were determined as well as bleachability with alkaline-hydrogen peroxide. Furthermore, changes of the distribution of lignin in the cell wall of the pulps by treatment with ozone and peroxide were observed under a ultraviolet microscope.
The yield and lignin content of the ozonized pulps decreased with increasing the rate of ozone consumption.
A large portion of dissolved material from the pulps by ozonization was consisted of lignin degradation products. Therefore, it was concluded that lignin reacted with ozone selectively and was almost dissolved from the pulps.
The energy required for the second refining, to reach specified freeness, was rapidly decreased by ozonization for 5 min.
Sheet strength properties of these ozonized pulps were higher than those of conventional CTMP. Particulary, a remarkable increase in tensile index was found.
The transverse sections of the cell wall of ozonized pulps were observed under a ultraviolet microscope at 280 nm. The results showed that lignin was dissolved stepwise from the outermost layer of pulps by ozonization. Elongation of the ozonization time led to the increase of the area of the lignin free region in the cell wall. No differences were found in the mode of delignification between the pulps from birch wood and from oak wood.
The PC number of ozonized pulps was significantly decreased by hydrogen peroxide bleaching. The distribution of lignin in the cell wall of the ozonized pulps was changed by the hydrogen peroxide bleaching while this phenomenon was not found for conventional CTMP by hydrogen peroxide bleaching. Lignin remained at the lumen side of the cell wall after ozone treatment found to be dissolved with alkaline-hydrogen peroxide.View full abstractDownload PDF (5834K) -
Micro topography of paper surface IVHaruki Wakebe, Hiroshi Hara, Raysabro Oye1988 Volume 42 Issue 10 Pages 963-972
Published: 1988
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe relation between the micro-topography of paper surface and liquid absorption in minute time was investigated on softwood and hardwood bleached sulphate sheets and an india paper by an apparatus, which was originally designed by Bristow and modified in order to be able to change the lip pressure.
It was found the Parker Print-Surf roughness increased a little in case of the hardwood bleached sulphate sheet and decreased in the softwood sheet and the india paper, when the lip pressure increased. The value of Rp decreased at the clamping pressure of 10 kg/cm2 and increased at 20 kg/cm2 in all cases. The roughness index calculated from the dynamic liquid absorption decreased in both softwood and hardwood sheets with lip pressure. The distribution of depth of void on paper surface measured from the stylus type smoothness tester became wider on the softwood sheet and the india paper, but narrower in the hardwood sheet.View full abstractDownload PDF (6913K)
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