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Volume 45, Issue 10
Displaying 1-8 of 8 articles from this issue
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The speciality of thin paper on demand and an approach to the lightening and multicolor printabilityHiroshi Hara, Takashige Yoshimura1991 Volume 45 Issue 10 Pages 1079-1094
Published: October 01, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe first thin paper was made as printing paper for the Bible at Oxford in 1841.
The basis weight of thin paper is up to 40g/m2. And this paper includes cigarette paper, India paper and carbon copying paper.
India paper is printing paper for dictionaries or the Bible. The origin of this paper is NAJIO-TORINOKO which is a kind of WASHI, or Chinese rice paper made from pith of rice paper tree. This thin printing-paper has characteristics of thinness and is highly opaque. And in order to keep its quality, pulp is refined elaborately and good scattered filler is added.
Recently, ultra-light-weight coated paper which is coated with light weight coating color by the gate roll coater has been developed.
In order to produce paper with many different characteristics, we make good use of many kinds of pulps, ways of refining, many sorts of fillers, surface sizing agents and calendering methods. And the fabrics for paper making are selected after due consideration.
Now, ways of recycling and improving the stiffness of thin paper are being studied.
In the future, it is expected that the use of thin paper will increase as the media produces higher information density per unit of paper weight.View full abstractDownload PDF (4471K) -
Wood Science Committee1991 Volume 45 Issue 10 Pages 1095-1105
Published: October 01, 1991
Released on J-STAGE: October 27, 2010
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Takashi Myoen1991 Volume 45 Issue 10 Pages 1106-1109
Published: October 01, 1991
Released on J-STAGE: October 27, 2010
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Solutions provided by Hitachi, LtdProcess Control and Automation Committee1991 Volume 45 Issue 10 Pages 1110-1119
Published: October 01, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThis serial report describes current topics in pulp and paper process instrumentation technology, and this paper forcuses on the automation technology that Hitachi, Ltd. provide for the pulp and paper industry.View full abstractDownload PDF (2380K) -
[in Japanese]1991 Volume 45 Issue 10 Pages 1132
Published: October 01, 1991
Released on J-STAGE: October 27, 2010
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Hiroshi Tomimasu, Philip Luner1991 Volume 45 Issue 10 Pages 1134-1143
Published: October 01, 1991
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSA new method using electron beams was developed to measure the coating weight distribution in a large sample area with a high resolution. Paper samples before and after coating were irradiated with electron beams between 50 and 200 keV generated by an electron gun, and electrographs were obtained on a film. The images were digitized by a drum scanner, and the difference between these images were calculated at different pixel sizes (0.1-1.6mm) with an image analyzer to measure the coating weight distribution. With this method, the effect of the basis weight distribution of the basestock on the coating weight distribution was examined. The effect of the surface roughness of the basestock was studied at the same time using profilometry. The results showed that on a fine scale, the surface roughness of the basestock controls the coating weight distribution. On a large scale, the basis weight distribution of the basestock controls the paper surface roughness. Consequently, the coating weight distribution is affected by the basis weight distribution of the basestock. The results also showed that the type of furnish (softwood or hardwood) and wire marks of the basestock have a significant influence on the coating weight distribution.View full abstractDownload PDF (3140K) -
Electrostatic Interactions between Coating Color Components as studied by Electron MicroscopyYong-Kyu Lee, Shigenori Kuga, Fumihiko Onabe, Makoto Usuda1991 Volume 45 Issue 10 Pages 1144-1151
Published: October 01, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSFor the purpose of visualizing the interaction between latex and pigment particles by electron microscopy, a new fixation technique was introduced that can preserve the shape of latex particles during the drying process. The method consists of mounting a drop of highly diluted coating color on a Formvar-coated copper grid for transmission electron microscopy (TEM) and treating the solution on the grid with osmium tetroxide vapor in a dessicator. Metal coating of this grid provided a specimen suited for scanning electron microscopy (SEM).
When the pH of sample suspension was adjusted by using phosphate buffer, the SEM observation revealed a striking difference in behavior between a conventional anionic latex and an amphoteric latex in aggregating tendencies with clay particles. While the anionic latex particles were dispersed nearly uniformly on the substrate at both acidic and alkaline conditions, the amphoteric latex particles were strongly adsorbed onto clay particles in acidic and nearly neutral conditions. These results suggest the effectiveness of using amphoteric latexes as a means to control the latex-pigment interaction in coating colors for improving flow properties and preventing binder migration.
The pH dependences of viscosity and the sediment volume ratio of undiluted coating colors were consistent with the latex-clay interaction as indicated by SEM observation.View full abstractDownload PDF (2361K) -
1991 Volume 45 Issue 10 Pages 1152-1157
Published: October 01, 1991
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (1050K)
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