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Volume 55, Issue 12
Displaying 1-16 of 16 articles from this issue
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[in Japanese]2001 Volume 55 Issue 12 Pages 1650
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (617K) -
Paper Coating Technologies in the 20 th CenturyTerunobu Fukui2001 Volume 55 Issue 12 Pages 1651-1667,013
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSProduction of coated papers for graphic arts reached 6.73M tons in 2000 in Japan. It has been continuing to expand since the production started in 1910s.
In this paper, the history of coating methods and coating materials are described with divided into 5 periods;(1) Brush and Air knife coating in the period from 1910s to 1960s, (2) On-machine coating in the 1950s and 1960s, (3) High speed blade coating in the 1970s and after, (4) Light weight on-machine coating by Gate roll coater in the 1980s and after, (5) Double blade coating in the 1990s.
It is obvious from the facts that both the coating methods and the coating materials have been continuing to evolve to match the market demands and to obtain high productivity, and it will continue in the future.View full abstractDownload PDF (5026K) -
Hisashi Matsui2001 Volume 55 Issue 12 Pages 1668-1686,013
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSCoating materials and their technical trends, important properties of coating colors are described. Recent problems of coating color and their examples of solution are also described. Fine particle pigments are increased and narrow particle size distribution pigments are studied. Transference to calcium carbonate rich formulations has not advanced.
Controlling high shear viscosity and water retention are necessary for coating color. High shear viscosity is generally measured by Hercules-type viscometer, but it is desirable for high shear viscosity to be measured by capillary viscometer or SDR at very high shear rate. Water retention is successfully measured by AA-GWR and this procedure is now in widespread.
It is desirable to be formulated to produce following coating layer. Coating layer is desired to be porous. smooth and uniform. In addition to that, good strength of coating layer is required. Narrow particle distribution pigments or amphoteric additives makes coating layer more porous.
Recently, there are a lot of problems about productivity and cost down, followed by such demands as improving binding strength for latices in order to decreasing binder contents.View full abstractDownload PDF (6377K) -
Masahiro Sugihara, Hiroshi Miura2001 Volume 55 Issue 12 Pages 1687-1695,014
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDesign speed of on and off-machine coater has been increasing successively, and its operating speed will be beyond 2, 000m/min in near future. Under such high-speed coating process, several technologies are required to maintain or improve the productivity and quality of coated paper.
In order to realize stable and efficient high-speed coating, stabilization of paper web behavior and suitable control of coating color flow are required. Improving the precision and response of control systems, reducing the several preparation times, and improving the drying efficiency are also required for high-speed coating. To serve these technical requirements, we have been carrying out several developments and improvements successively. In this paper, state of the art technologies for high-speed coating, such as “mist reduction system” for film coater, and “steam substitution system” for curtain flow coater, are reviewed briefly.View full abstractDownload PDF (4685K) -
High Speed and High Quality Coating TechnologyKouichi Yuuki2001 Volume 55 Issue 12 Pages 1696-1702,014
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe newest coating technology is now developing day by day. The requirement to the coater is contained two totally different categories, one is high speed and the other is quality. These requirements are sometimes contradict in each other. But the newest coating technology is provided both goals simultaneously.
Metso paper developed improved blade coater Opti-Coat jet and Opti-Blade and new film coater Opti-Sizer. These machines are already running in speed world record. And moreover, to achieve higher speed and to get high quality Metso developed totally new spray coating technology Opti-Spray. And these coater series are contained in the part of Opti-Coater called as Opti-Consept.View full abstractDownload PDF (3392K) -
Tadashi Sasa2001 Volume 55 Issue 12 Pages 1703-1710,014
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSCoating machine is classified and named by coating method of its coater head. The products are produced, in accordance with their use and purpose, with the selected coater head characterized by metering method. Blade Coater has been the major coating method for printing paper in the world. because the products coated by blade coater have excellent smoothness, which is one of the most important demanded for the high quality paper. Furthermore, blade coater is very suitable for coating at high speed and has high performance for controlling coating weight in wide range.
Air knife coater is used mainly for film coating especially for carbonless paper and thermal paper, although it is classical type of coater now. Coating with air knife coater is very uniform and satisfies the demand of even coverage. Recently, curtain type coaters have been adopted, often and take the place of air knife coater for film coating.
As mentioned above, the coating method is characterized by demanded product quality. Recently. the demand of inkjet paper for printer has been increasing due to the spread of products related with IT. As the use of paper and demand of quality becomes more various, the selection of suitable coating head for such new products as inkjet becomes an important subject hereafter.
Here, we would like to introduce our representative coating head and classify its function and characteristics.View full abstractDownload PDF (3554K) -
Ryuichi Katayama2001 Volume 55 Issue 12 Pages 1711-1716,015
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSMitsubishi Hachinohe Mill have five coaters including with two on-machine coater. Coater machine No.5 which has been operated since 1988, is blade coater with top speed 1, 575m/min. 5CM produces approximately 600 ton per day of coated paper. For building up smooth runnability of 5CM we had to get over some technological problems.
(1) The suitable types according for description, coat weight and coating speed
(2)“Auto Profiler” which is effective to stabilize coat weight profile rapidly and to prolong blade life.
(3) Suitable of blade extention ratio for high speed coating, to improbe web surfice smoothness and to facilitate grade changes.
(4) The effect of low viscosity color application on decresing blade load in high speed range.
(5) The optimum operational condition of IR dryer for printability.
We have tried further more high speed coating test in a pilot coater. As a result, we obtained good result of runnability and quality in 1, 800m/min.View full abstractDownload PDF (1715K) -
Yutaka Kaneko2001 Volume 55 Issue 12 Pages 1717-1721,016
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIwakuni mill is located on the shores of the inland sea. Which makes an excellent condition fore receiving raw materials and transporting finished products. This location also provides an unlimited supply of mill water and inexpensive mineral resources from nearby.
The mill started producing pulp in 1937. Then expanded its production to relating fields such as fine paper, chemical products. With the start of the operation of PM 9 in 1998, Iwakuni mill is producing 650, 000 ton/year of fine paper. 70% of the product is coated paper.View full abstractDownload PDF (2139K) -
Takuo Kitayama2001 Volume 55 Issue 12 Pages 1722-1730,016
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn conjunction with the rapid development of computer technology and the progress of digital technology in the past ten years, printing industry is changing its business style. The dominance of digital processing and the emergence of the CTP accelerate the integration of the reproduction process and the plate making process. As for the printing press, ‘Direct imaging press’, ‘Electrophotography and Inkjet printer satisfied the demand of high quality digital imaging’ are developed and used in a area of ‘short run’and ‘on-demand’ printing. In addition to those situation, the environmental requirement is another factor of the changes in the printing industry. Because the exclusion of VOCs are demanded for the purpose of the earth-environment preservation and improving working environment, the use of soy oil increased as a substitution for the organic solvents in the printing ink. The development of waterbased ink has also been discussed to meet this demand. Here. I would like to address the trends of the printing industry from the technical point of view and its effect on the characteristic of the coated paper.View full abstractDownload PDF (4386K) -
Jiro Kawabayashi, Hiroshi Onishi2001 Volume 55 Issue 12 Pages 1731-1737,017
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSRecent years. demand for quality of printing has been increasingly becoming strict. In particular, the element that is most emphasized recently is consistency of quality, including stability of color tone and ink lay as well as the condition that there is no defect caused in the printing and binding processes. As for color tone. for instance. the points regarded most critical are to be accurate to the actual color of products rather than excellent chroma and rich density, to reproduce the same colors as those on the previous edition of catalogue or other catalogues for the same products, to uniform colors of parts with those on the other pages. and to exactly stick to color tone on the final approved proof. In term of color tone, what is primarily required to paper stock is that whiteness and color hue must be consistent. In this article. I wish to discuss on paper quality expected form a viewpoint of final products printed by offset.View full abstractDownload PDF (1890K) -
[in Japanese]2001 Volume 55 Issue 12 Pages 1740
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (239K) -
[in Japanese]2001 Volume 55 Issue 12 Pages 1741
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (248K) -
Photo-catalytic Oxidation Treatment of Wastewater from Pulp and Paper Mills in ThailandHiromutsu Wada, Prisnar Siriacha, Yoshinari Kobayashi2001 Volume 55 Issue 12 Pages 1742-1749,017
Published: December 01, 2001
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSThe authors surveyed the present status of wastewater treatment in several handmade paper mills in Thailand. The quality of wastewater, it was made clear that the COD and color improved considerably by combined treatment of anaerobic process with aerobic one. Ozone oxidation under UV irradiation improved water quality more rapidly than ozone treatment alone (Part 1 and Part 2).
In the present study, the authors carried out TiO2 photo-catalytic oxidation under artificial UV lamp or solar light as light sources. Wastewater sample which contained organic substances as COD 100 mg/L and colored in pale brown was collected from final aerobic ponds in small pulp and paper mills. UV irradiation (artificial UV light or solar light) with TiO2 catalyst decreased COD more rapidly and eliminated color more effectively than UV treatment alone. The deceleration degree of dyestuff gave extremely excellent results by TiO2 photo-catalytic oxidation using UV lamp or solar light.
In conclusion, it was suggested that organic compounds given as COD and color caused by dyestuff in wastewater can be decomposed by biological treatment of combined anaerobic-aerobic process, followed by TiO2 photo-catalytic oxidation treatment under artificial UV light or solar light in relatively short time. This is a kind of non-chemical process in wastewater treatment.View full abstractDownload PDF (1562K) -
Shuichi Maeda, Masakazu Hakomori, Toru Nakai, Akira Nakamura, Masaru K ...2001 Volume 55 Issue 12 Pages 1750-1760,018
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThere has been increasing interest in receiving sheets having porous layers for use in digital printing because of their porosity, low thermal conductivity and high compressibility. The simplest route to obtain paper sheet having a porous layer is to coat a sheet substrate with a coating mixture containing fine air bubbles. In our own research program we have focused on the preparation of the coating mixture using a bubble coating method of introducing and dispersing air bubbles in a resin-containing liquid. Recently we reported the way to disperse and stabilize fine bubbles as the key technology in obtaining successful microporous layer.
In this paper we describe the formation, characterization and application of the microporous layer prepared by the method. The microporous layer has been analyzed in terms of its structure, thermal conductivity and compressibility. The microporous layer has an average surface pore diameter of 5 to 12μm and a density of 0.14 to 0.25g/cm3. The paper sheet having the microporous layer has a thermal conductivity of 0.25W/(m·k) or less. The compression stress of the sheet under a high compression of 10% by volume is measured to be 6.2kg/cm2 or less.
A recording sheet for a thermal wax transfer printer is considered to be one of the most likely commercial applications for the microporous paper sheet. This is because the thermal wax transfer system requires not only low thermal conductivity and high compressibility but also a high affinity to wax ink. In this system a molten ink permeates into the microporous surface layer due to the capillary action of a large number of fine pores. The microporous layer acts as an ink-receiving layer in thermal wax transfer printing and enhances the print quality such as the optical density, tone reproduction, dot reproduction and color brightness.View full abstractDownload PDF (3013K) -
2001 Volume 55 Issue 12 Pages 1761-1763
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (1321K) -
[in Japanese]2001 Volume 55 Issue 12 Pages 1764-1765
Published: December 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (492K)
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