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Volume 28, Issue 12
Displaying 1-9 of 9 articles from this issue
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Toshio Ichimi1974 Volume 28 Issue 12 Pages 571-575
Published: December 01, 1974
Released on J-STAGE: November 10, 2009
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Masatoshi Matsuo1974 Volume 28 Issue 12 Pages 576-582
Published: December 01, 1974
Released on J-STAGE: November 10, 2009
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Tsutomu Shintani, Seishi Machida1974 Volume 28 Issue 12 Pages 583-593
Published: December 01, 1974
Released on J-STAGE: November 10, 2009
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1974 Volume 28 Issue 12 Pages 594
Published: December 01, 1974
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSDownload PDF (324K) -
1974 Volume 28 Issue 12 Pages 595-596
Published: December 01, 1974
Released on J-STAGE: November 10, 2009
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Kyuzaburo Ishiguro, Fumimasa Aburai1974 Volume 28 Issue 12 Pages 597-603
Published: December 01, 1974
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSThe stock inlet distributor is the important part for producing good quality paper by discharging the stock flow from the fan pump uniformly into stock inlet and now so-called manifold type ones are widely applied.
However there exist quite little literatures about the analysis of this part from the viewpoint of engineering, except a few typicial ones published by S. Steenberg, S. Pettersson and etc. these are, however not corresponding with the recent situation, as they dealt with slit types, not multi tube types.
This draft shows the result of theoretical calculation about what shape of header is most adequate for uniform stock discharge from the multitubes into the stock inlet and what over flow rate (re-circulation amount) is to be aimed from the edge of the header, and confirmed the result on the actual machine of 3, 680 mm wire width and 340 m/min speed. The distributor of this machine is as shown in Fig. 4. The result shows that, in order to achieve the universal flow from each tube into stock inlet, over flow rate from the edge of header should be controlled within the range of 7.610%. This figure is found far less than the conventional exprience of 1025%. However as this figure of adequate over flow rate varies according to the shape of header and multi tubes, calculations should be made on each case based on the theoretical formula shown in this draft.View full abstractDownload PDF (1156K) -
Coagulation Characteristics of LignosulfonateMichitaro Jo, Gyosuke Meshitsuka, Junzo Nakano1974 Volume 28 Issue 12 Pages 604-610
Published: December 01, 1974
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSThe pulp and paper industry is genuinely concerned about the pollution from its mill. Concerning the pollution problems, it is important to clear the coagulation characteristics of pulping effluents.
This paper describes mainly the coagulation of lignin in bleach effluents by the use of commercial lignosulfonate as model sample of lignin. Lignosulfonate purified by gel chromatography was treated with chlorine or with chlorine and sodium hydroxide by the similar conditions to pulp bleachig.
The results are summarized as follows ;
(1) Functional groups of lignosulfonate, carboxyl, phenolic hydroxyl and carbonyl groups, increase remarkably by chlorine treatment, while the molecular weight of lignosulfonate decreases by chlorine treatment. The amounts of functional groups and molecular weight of lignosulfonate treated with chlorine-sodium hydroxide do not change significantly comparing with those of chlorine treated lignosulfonate. However, exceptional is the increment of phenolic hydroxyl groups.
(2) Three kinds of lignosulfonate, namely untreated, chlorine treated and chlorine-sodium hydroxide treated, coagulate effectively with aluminium sulfate at the pH level of 4.5-5.0. The efficiency of coagulation, however, drops remarkably with increasing the amount of chlorine added.
(3) The order of coagulant addition and pH ajustment influences the efficiency of coagulation of spent water. The efficiency of coagulation is higher in the case of coagulant addition followed by the pH adjustment of spent water than in the case of reverse order.View full abstractDownload PDF (1297K) -
Peracetic Acid Bleaching of Kraft Pulp Prebleached by Oxygen-AlkaliTomoaki Nishida, Kokki Sakai, Tamio Kondo1974 Volume 28 Issue 12 Pages 611-617
Published: December 01, 1974
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSThe oxygen-bleached birch kraft pulp was further bleached with peracetic acid under the various conditions and the effects of variables at the peracetic acid stage including bleaching temperature and time, pulp consistency, peracetic acid doses and pH of bleaching liquor, upon the properties of the bleached pulp such as yield, brightness, PC No. and viscosity were evaluated statistically. Among the variables tested, bleaching temperature had highly significant effects upon all of these pulp properties, especially the effect upon viscosity of the pulp was remarkable. (Table 3)
In the oxygen-alkali and peracetic acid (O-PA) sequence, pulp brightness 89 could be obtained by treatment with 5% peracetic acid doses and at 90°C, so it seemed to be possible to obtain the fully bleached pulp with O-PA sequence. As pulp brightness increased, brightness stability increased and the decrease in yield was quite slight, in contrast to the case of the oxygen-alkali and hydrogen peroxide (O-P) sequence.
In O-P sequence, when the brightness increased beyond 77, reductions of yield, viscosity and brightness stability of the bleached pulp were quite remarkable as reported in the previous paper. The viscosity of the O-PA bleached pulp was independent of the brightness of the pulp, but largely decreased as the bleaching temperature increased.
Oxygen-bleached pulp was subsequently bleached with peracetic acid and hydrogen peroxide and the sequences O-PA-P, O-P-PA, and O-PA were compared with each other in termes of the pulp properties. As compared at the same amount of chemicals, pulp brightness increased in order, O-PA-P>O-P-PA>O-PA sequences.View full abstractDownload PDF (1247K) -
Hisao Ishikawa, Katsumi Okubo, Tae Oki1974 Volume 28 Issue 12 Pages 618-624
Published: December 01, 1974
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSA study of the permeability of a dilute tororo-aoi mucin solution passing through wood pulp and Kozo pulp beds was carried out by employing a apparatus shown in Fig. 1.
A dilute tororo-aoi mucin solution was remarkable the characteristic permeability through pulp beds than that of the other polymer solutions such as a dilute polyethyleneoxide or polyacryl amide solution. The fluent flow of the mucin solution through pulp beds proved to be unexplainable by Darcy's equation, Q=KAP/ηL. The characteristic permeability was also found to be occured by the interaction between mucin molecule in aqueous solution and the surface of capillary wall of pulp bed.
When the changes of the permeability of a dilute mucin solution by heating treatment were compared with that of the comformation of mucin molecule in aqueous solution, it was found that the transition of order structure, which was a week junction zone structure of the molecule, to helix one on heating above 60°C reduces remarkably the permeability.View full abstractDownload PDF (1233K)
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