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Volume 25, Issue 12
Displaying 1-10 of 10 articles from this issue
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Setsuro Kagesa1971 Volume 25 Issue 12 Pages 586-588
Published: December 01, 1971
Released on J-STAGE: November 10, 2009
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Yoichi Odaka1971 Volume 25 Issue 12 Pages 589-594
Published: December 01, 1971
Released on J-STAGE: November 10, 2009
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T. Hotta1971 Volume 25 Issue 12 Pages 595-599
Published: December 01, 1971
Released on J-STAGE: November 10, 2009
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Application Properties of Coating Colors Containing Carboxyethylated Polyvinyl AlcoholMitsuru Kondo, Satoshi Dotani, Tadashi Kamioka1971 Volume 25 Issue 12 Pages 600-605
Published: December 01, 1971
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSThe properties of carboxyethylated polyvinyl alcohol (CEP) coating colors and coated paper were studied, and the correlations between high shear rheological properties and actual coating trials on a pilot equipment were discussed.
It was found that the colors had high shear rheological properties desiable equivalent to those of starch colors and casein colors, and the colors could be successful applied by blade, air knife and roll coaters to produce smooth, pattern-free coatings, while the flow properties of the unmodified PVA colors were less than those of CEP colors and they showed severe patterning.
In addition to good rheological properties of the colors, the qualities of the coated papers were satisfactory for printability tests, and especially, ink receptivity of the papers was superior to that of PVA/clay, starch/clay and casein/clay coated papers.View full abstractDownload PDF (1158K) -
An Approach to Some Powerfull Hydrotropic ReagentsYozo Yamada, Tamio Kondo1971 Volume 25 Issue 12 Pages 606-611
Published: December 01, 1971
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSAqueous aminobenzene sulfonate solutions, such as sodium sulfanilate and sodium metanilate, were found to be efficient delignifying agents for beech wood. Factors affecting the degree of delignification, such as liquor concentration and cooking time, were studied. With wood meals, 93-95% of the original wood lignin could be removed after 2 hr at 170°C in 30% aqueous solution of sodium aminobenzene sulfonates at an initial pH of 9.5. It was found that at a pulping yield of 46% the chemical properties of the pulp after new hydrotropic cooking was superior to that of the conventional hydrotropic digestion. A comparison of the analytical figures and the gel-chromatogram of the new hydrotropic lignins with those of the lignins recovered from the usual hydrotropic cooking liquors showed that the occurrence of the bulk delignification reaction followed by a prior extended depolymerisation would also seem probable.View full abstractDownload PDF (1062K) -
Kuninori Usami, Tsutomu Kayama1971 Volume 25 Issue 12 Pages 612-625
Published: December 01, 1971
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSThis paper describes the results of alkaline pulping of beech wood, which has been cooked by ammonium sulfite and ammonium hydroxide solutions. In series of cooking, liquor concentration, maximum temperature and cooking duration at maximum temperature were varied. Evaluation of pulpings were investigated by analysises of the residual lignin and pentosans in resultant pulps, bleaching and paper strength tests.
Summary of results are shown as follows ;
1) It was found that the best conditions for cooking were as follows :
Liquor composition : Ammonium sulfite 18%, Ammonium hydroxide 30%
Liquor to wood ratio 4.5 : 1
Maximum temperature 180°C
Time at maximum temperature 2hr.
2) Total pulp yield ranged from 55.8% to 64.6%. It was decreased with increasing sulfite-ion concentration. The pulp yield was increased rapidly in proportion to ammonium-ion concentration in the range of lower concentrations, but this relation was reversed over some ion concentration. This changing point was moved to the higher ammonium-ion concentration with increasing sulfite-ion concentration.
3) Residual lignin in pulps stood in the range of 0.89-6.90% (based on oven dry wood). The rate of delignification was proportion to [NH4] [SO3] 3.016. The ability of delignification with sulfite-ion was about three cubed times as much as that of ammonium-ion.
4) The degradation of pentosans by cooking were controlled with increasing the concentration of ammonium-ion, but were activated with increasing the concentration of sulfite-ion.
5) Whiteness of bleached pulps were slightly lower than that of the ordinary bleached chemical pulps. In the case of well cooked pulps, decreasing of pentosans by bleaching was a little. The maximum decrement of pentosans was not exceeded about 4%. Yields of bleached pulps stood in the range of 53-56% (based on oven dry wood).
6) The strength properties of unbleached pulps were lower than those of the ordinary sulfate pulps, but those were improved by bleaching treatment. The strength properties of bleached pulps were similar to those of the ordinary bleached sulfate pulps. The pulps cooked by 18% ammonium sulfite and 40% ammonium hydroxide solution showed best strength properties.View full abstractDownload PDF (1907K) -
Masami Tajima1971 Volume 25 Issue 12 Pages 626-628
Published: December 01, 1971
Released on J-STAGE: November 10, 2009
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Rokuro Maematsu1971 Volume 25 Issue 12 Pages 629-637
Published: December 01, 1971
Released on J-STAGE: January 22, 2010
JOURNAL FREE ACCESSThe use of fluorescent whitening dyes with food paper container or packing material and sanitary napkin for medical supplies is forbidden by the Food Sanitation Law in Japan.
The ground of this law is introduced ; the toxic experimental results and its opinions were introduced.
A measurement of fluorescent strength by colrimeter and the relationship between additional amounts and florescent strength, stripping method of fluorescent whitening paper were studied.
The retention of fluorescent dyes in paper is 31%.View full abstractDownload PDF (1826K) -
[in Japanese]1971 Volume 25 Issue 12 Pages Preface1-Preface3
Published: December 01, 1971
Released on J-STAGE: November 10, 2009
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1971 Volume 25 Issue 12 Pages Preface9-Preface10
Published: December 01, 1971
Released on J-STAGE: November 10, 2009
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