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Volume 20, Issue 3
Displaying 1-11 of 11 articles from this issue
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[in Japanese]1966 Volume 20 Issue 3 Pages 93-99
Published: March 05, 1966
Released on J-STAGE: November 11, 2009
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[in Japanese]1966 Volume 20 Issue 3 Pages 115-120
Published: March 05, 1966
Released on J-STAGE: November 11, 2009
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[in Japanese]1966 Volume 20 Issue 3 Pages 121-126
Published: March 05, 1966
Released on J-STAGE: November 11, 2009
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[in Japanese]1966 Volume 20 Issue 3 Pages 127-130
Published: March 05, 1966
Released on J-STAGE: November 11, 2009
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Hideaki Masaki, Yoshimi Hirakawa1966 Volume 20 Issue 3 Pages 131-139
Published: March 05, 1966
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSCauses of the pitch trouble in the news paper machine process were found out and the preventative treatment for them were established. Troublesome pitch in the process comes mostly from unbleached sulfite pulp. The pitch of sulfite pulp is more fluid and sticky than that of ground pulp and chemi-ground pulp. Those characteristics are due to insufficient seasoning of wood in winter. The same results are obtained also in ground pulp.
The pitch trouble caused by sulfite pulp is avoided by means of converting the wood species, red pine to Japanese cedar. In the case of ground pulp, the trouble is apt to appear when the wood contains amount of sticky pitch.
The depositing pitch of ground pulp is remarkably reduced when oxidation agent is used to accelate the seasoning effect. For this effect, permanganate is most intensive and peroxide or calcium hypochlorite are also considerably effective.View full abstractDownload PDF (1864K) -
Eiichi Taniguchi1966 Volume 20 Issue 3 Pages 140-143
Published: March 05, 1966
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSThe purpose of the work reported here has been to clear not only the process of bleaching ground pulp yields, but also the behavior of active group contents, K-value and copper number under the various per acetic acid bleaching.
And also, to make sure how hemicelulose undergo change were investigated about active groups, degree of polymerization and yields of one. It may be concluded from above results that per acetic acid were milder against carbohydrate.
After extraction of hemicelulose from per acetic acid bleaching pulps by dimethylsulufoxide, carbonyl group contents in pulp remarkably decreased. It seems likely that one of the factors of color reversion depend on carbonyl group contents in per acetic bleaching pulps.View full abstractDownload PDF (949K) -
Report No. 1 The effect upon the strength of the accomplished paper if tension is given to hand wetsheetTakefumi Okamura1966 Volume 20 Issue 3 Pages 144-150
Published: March 05, 1966
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSA lot of researches have been announced about the relation between the tension given to sheet and the strength of accomplished paper in the process of drying sheet.
These researches, however, every of them, are described that by adding a constant tension or threegraded tension to sheet in the process of drying it, it should be dried and, then analized. According to this method, therefore, it seems difficult to understand well in what quantity of water, how much effect, tension which is given in the process of drying, gives to sheet.
Now, the experiment which I am going to make is as follows. We add tension to sheet the moment it contains a certain quantity of water, and later dry it under the same condition. In comparison with the sheets which is given no tension and dried under the same condition, I intend to analize how much effect, tension gives to the accomplished paper, in what quantity of water.
Conclusion
1) If tension is given, in machine direction, to wetsheet which contains 70% of water, accomplished paper reduces both its logitudinal and lateral tensile strength and expansion.
2) When we extend longitudinally wetsheet which contains 70% and 60% of water, the side of wetsheet indicates shrinkage in proportion to the expansion of the length. The difference of shrinkage which results from the difference of expansion keeps the same degree not only in the process of drying but also in the accomplished paper. The ratio of the longitudinal expansion to the lateral shrinkage is nearly 1 to 0.64 in every case.
3) When we extend wetsheet longitudinally as long as long as 3%, 2%, and 1% of its length which contains 70% and 60% of water, perfectly preventing it from its longitudinal shrinkage, the ratio of lateral shrinkage of the dried paper is 6.7%, 6.06% and 5.50% respectively.
4) When we extend longitudinally wetsheet (70%55% of water) as long as 1% of its length and, dry it, keeping its expansion, the dried paper reduces 0.5%0.7% of its longitudinal expansion. When we extend it longitudinally as long as long as 2% and 3% of its length, it reduces its longitudinal expansion at the same rate. On the contrary, it increases 0.2%0.4% of its lateral expansion.
5) When we extend wetsheets which contain various quantity of water (70%55%), if the ratio of expansion is identical, the strength of accomplished paper has very little difference among them.View full abstractDownload PDF (1213K) -
A. W. Naumann, [in Japanese]1966 Volume 20 Issue 3 Pages 151-155
Published: March 05, 1966
Released on J-STAGE: November 11, 2009
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R. G. Woolery, [in Japanese]1966 Volume 20 Issue 3 Pages 155-162
Published: March 05, 1966
Released on J-STAGE: November 11, 2009
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[in Japanese], [in Japanese]1966 Volume 20 Issue 3 Pages 163-166
Published: March 05, 1966
Released on J-STAGE: November 11, 2009
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1966 Volume 20 Issue 3 Pages 166
Published: 1966
Released on J-STAGE: November 11, 2009
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