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Volume 15, Issue 3
Displaying 1-10 of 10 articles from this issue
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[in Japanese]1961 Volume 15 Issue 3 Pages 158-159
Published: March 10, 1961
Released on J-STAGE: November 17, 2009
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[in Japanese]1961 Volume 15 Issue 3 Pages 160-167
Published: March 10, 1961
Released on J-STAGE: November 17, 2009
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[in Japanese]1961 Volume 15 Issue 3 Pages 168-170
Published: March 10, 1961
Released on J-STAGE: November 17, 2009
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[in Japanese], [in Japanese]1961 Volume 15 Issue 3 Pages 171-173
Published: March 10, 1961
Released on J-STAGE: November 17, 2009
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Yuji Harazaki, Kinroku Otsuka, Michio Fukushima, Atsuo Nakanishi1961 Volume 15 Issue 3 Pages 174-181
Published: March 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe results of a study of the properties of paper treated with PVA powder by the beater addition are presented.
Factors affecting the retention and the strength of the sheets are discussed including the rate of dissolution, particle size of the resin in the range of saponification degree 95.7-99.9%. The absorption water of the sheets are needed more than 60% before drying process.
Major advantage was found in the use of PVA powder as beater addition for paper strength.View full abstractDownload PDF (1023K) -
(Part 3) Method of Total Alkali Titration and Side Reactions between Sulphide and Sulphite taken place at that TitrationZenshiro Isono1961 Volume 15 Issue 3 Pages 182-189
Published: March 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe side reactions between sulphide and sulphite which take place at the neutralization of those mixtures and the total alkali titration method of kraft liquors were studied. The results are summarized as follows :
1. When total alkali of a sample containing sulphite in great quantities is titrated without aldehyde, the side reactions pointed out by D. R. Moltzau are taken place distinctly and result a decrease in alkalinity.
2. On the contrary, it is possible to titrate whole of sulphite (not a half of sulphite, as usually supposed) when titration is made rapidly with 1 N-acid using methyl orange indicator on a 50 ml of diluted sample by twenty times of the original liquor containing Na2 SO3 about 5 g/l or less, and nearly at the end point promote the reaction which increases alkalinity at acidic medium by heating and then cooling to the room temperature, and again titrate to the final end point.
Total alkali obtained in such way, therefore, is expressed as follows :
NaOH+ Na2S + Na2CO3+ Na2SO3+ Na2SiO3
And in this way, no addition of furfural is neccessary.
3. The side reaction which decreases alkalinity is expressed in the next chemical equation.
2NaHS+4NaHSO3=3Na2S2O3+3H2O
And the reaction by which whole of sulphite are neutralized is expressed as follows :
NaHSO3+3H2S=NaHS+3S+3H2O
or
2NaHSO3+2H2S=Na2SO3+3S+3H2OView full abstractDownload PDF (1853K) -
Manufacture of Semichemical Pulp by Reproduced Cooking Liquor from Soda Pulp Waste LiquorYutaka Kimura, Toshiro Fujii, Isao Akamatsu, Yasuichi Murao1961 Volume 15 Issue 3 Pages 190-196
Published: March 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe cyclic treatment was designed that lignin is removed from alkali pulp waste liquor by passing SO2 gas, the filtrate is used as cooking liquor of semichemical pulp and the semichemical pulp waste liquor is concentrated and burned with removed lignin, the resulting smelt is used as cooking liquor of alkali pulp.
This report is explained the effect of pH variation (acidic to neutral) of reproduced cooking liquor from soda pulp waste liquor on chemical properties of semichemical pulp.View full abstractDownload PDF (1291K) -
Part 4. The Behaviors of Paper and Paper Bag by Changing Moisture Content of ThemNobuakira Fujinami, Takefumi Okamura1961 Volume 15 Issue 3 Pages 197-200
Published: March 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSGenerally speaking, after the heated cement was packed in the paper bag (or at low humidity of atmosphere), the moisture content of paper would be fairly lowered. So, we tried to examine the relation between a few strength properties and moisture content of Clupak and Normal Japanese kraft paper and paper bag.
1) Decrease rate of elongation of machine direction (M. D.) of Clupak paper was not so different from that of elongation of cross direction (C. D.) of Normal kraft paper by changing moisture content of it.
But decrease rate of elongation of C. D. of Clupak paper was larger than that of elongation of each direction of the other papers.
2) Decrease rate of the product of tensile strength and elongation of M. D. or C. D. of Clupak paper was larger than that of each direction of Normal kraft paper by decreasing moisture content of it.
Specially, the absolute value of the product of C. D. of Clupak paper was lowest.
3) In the results of Face & Back drop test using small type of paper bag, Normal kraft paper bag with low moisture content decreased in a sixth and Clupak paper bag with low moisture content decreased in a eighth. Yet, Clupak paper bag had a little higher drop number to destruction.
4) In the results of Butt drop test, the strength of Clupak paper bag had sixty per cent of that of Normal kraft paper bag at 2.5% moisture content.View full abstractDownload PDF (730K) -
[in Japanese]1961 Volume 15 Issue 3 Pages 201-206
Published: March 10, 1961
Released on J-STAGE: November 17, 2009
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[in Japanese]1961 Volume 15 Issue 3 Pages 207-210
Published: March 10, 1961
Released on J-STAGE: November 17, 2009
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