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Volume 21, Issue 4
Displaying 1-11 of 11 articles from this issue
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[in Japanese]1967 Volume 21 Issue 4 Pages 183-187
Published: April 01, 1967
Released on J-STAGE: November 11, 2009
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[in Japanese]1967 Volume 21 Issue 4 Pages 188
Published: April 01, 1967
Released on J-STAGE: November 11, 2009
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[in Japanese]1967 Volume 21 Issue 4 Pages 189-196
Published: April 01, 1967
Released on J-STAGE: January 25, 2010
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Shojiro Tanaka, Takashi Kikuchi1967 Volume 21 Issue 4 Pages 197-202
Published: April 01, 1967
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSThe utilization of CMC (carboxymethyl-cellulose) as a surface sizing agent has been studied.
Through several experimental applications on a small size test paper machine, suitable conditions of CMC for the purpose of surface sizing were defined as follows :
D.S. 0.50.8
Viscosity 50100 c.p. (3% soln., 25°C)
Impurity Less than 25%
The paper surface-sized by CMC showed such characteristics as high oil and air resistance and high wet tensile strength. These characteristics might enable us to use CMC for under coating besides general surface sizing.
The practicality of CMC surface sizing was also approved qualitatively and economically by a test run on a commercial paper machine.View full abstractDownload PDF (828K) -
Kiyoshi Mii, Fumikazu Tateiwa, Yoshiyuki Ando1967 Volume 21 Issue 4 Pages 203-208
Published: April 01, 1967
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSMeasurement of air permeability of paper less than a few seconds is unavoidablly subject to a great deal of error so far as the use of hand-operated stop watch. So we developed an automatic permeability tester using a electric second-watch and a light-relay device.
It is confirmed that using the device described, which enables one to test on one-sheet basis instead of using as test proof numerous sheets put together in layer, the exactitude in time of measurement for papers of high air permeability can be improved to a great extent.View full abstractDownload PDF (763K) -
Yoshitaka Ogiwara, Kenichiro Arai1967 Volume 21 Issue 4 Pages 209-213
Published: April 01, 1967
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSRecently, cellulose hydrolytic enzyme, cellulase, has been provided in semi-commercial scale, and it is desired to find some uses. In this paper, to study the feature of the reaction, the phenomena of the hydrolysis of bleached sulfite pulp with commercial cellulase were compared with those with hydrochloric acid. The results were as follows :
1) The difference was shown between the amounts of the part resist to acid hydrolysis and that to enzymatic one. The former was more than 80%, and the latter was less than 70%.
2) The rate of enzymatic hydrolysis of the pulps, each yield being 81% and 55%, prepared with enzymatic treatment, were somewhat lower than that of original pulp. But, in the case of acid hydrolysis of the pulps pretreated with enzyme, two different results were obtained. When the pulp slightly pretreated with enzyme, the rate of hydrolysis decreased, but it increased when it was prehydrolysed up to a certain extent, as compared with that of the original pulp.
3) Nevertheless the shape of the distribution curve and the average DP of the pulp changed remarkably with acid hydrolysis, very small changes were merely observed when the pulp was treated with enzyme.
4) Whereas pulp fiber was changed easely into fine powder with acid hydrolysis, the changes of the fiber in length and width with enzymatic hydeolysis were very small.View full abstractDownload PDF (729K) -
Koichi Nagai1967 Volume 21 Issue 4 Pages 214-216
Published: April 01, 1967
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSSome attempts were made for standardized representation of pulp fiber classifying results.
On H.S. type fiber classifier, log plots of residual fractions versus shieving time indicated rapid falling at the start and subsequent slower linear decrease (Fig. 1), though theire declination varies with the sample, wire mesh, and other shieving conditions.
Thus, it can be regarded as the process consists of two parts; one depends on relatively shorter fiber fraction, and the other represents the behavior of longer or impassable fraction.
Each part was represented by equation in which the passing probability was assumed semiempirically.
Through fitting their solutions with experimental data, the percentages of impassable fractions were estimated. For several samples, these estimated values indicated monoclinic decrease with increasing mesh-opening.View full abstractDownload PDF (492K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1967 Volume 21 Issue 4 Pages 217-223
Published: April 01, 1967
Released on J-STAGE: November 11, 2009
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[in Japanese]1967 Volume 21 Issue 4 Pages 224-227
Published: April 01, 1967
Released on J-STAGE: November 11, 2009
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Blair L. Ingalls, Charles P. Klass, [in Japanese]1967 Volume 21 Issue 4 Pages 228-232
Published: April 01, 1967
Released on J-STAGE: November 11, 2009
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[in Japanese]1967 Volume 21 Issue 4 Pages 233-236
Published: April 01, 1967
Released on J-STAGE: November 11, 2009
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