JAPAN TAPPI JOURNAL

Progress in TAPPI Non-wood Plant Fiber Pulping Session

My Impression on 11 th Non-wood Plant Fiber Pulping Session in 1980 TAPPI Pulping Conference

Yoshinari Kobayashi

1981 Volume 35 Issue 6 Pages 471-479
Published: June 01, 1981
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.2524/jtappij.35.471

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Summarization of Responses to Questionnaire cocerning “the Improvemnt of Efficiency at COD Removal” for Pulp and Paper Mill Effluent (I), (II)

[in Japanese], [in Japanese]

1981 Volume 35 Issue 6 Pages 480-507
Published: June 01, 1981
Released on J-STAGE: January 29, 2010

DOIhttps://doi.org/10.2524/jtappij.35.480

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Pulp and paper industry in Japan is now confronted with severe regulations on water pollution by the government or the local self-government. In order to meet the regulation, the reduction of COD has been carried out through the coagulating sedimentation, the biological treatment or the combination of both processes. The treatment has become more and more expensive for the pulp and paper companies.
This report is a summarization of responses to questionnaire sent to 25 companies (67 mills) concerning the cut down of the costs for the treatment of effluent obtained by the improvement of efficiency at COD removal. Results are as follows :
(1) Each company takes such measures as the intensification of operation management, the alteration into the use of cheaper chemicals, the rationalization of the use of mill water and the saving of energy to cut costs.
(2) The amount of COD generating for a unit term and the cost of treatment are quite different from mill to mill.
(3) Reduction ratio of COD is significantly dependent upon the regulation, and the severer the regulation, the higher the reduction ratio and the higher the cost of treatment.
(4) Reduction ratio of COD through coagulating sedimentation process and activated sludge process is also very different between mills. This is probably clue to the difference of quality of effluent.

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[title in Japanese]

1981 Volume 35 Issue 6 Pages 508
Published: June 01, 1981
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.2524/jtappij.35.508

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Pulp and Paper Mills in Japan (33)

Tokyo Mill, Takasaki Paper Co., Ltd.

Takasaki Paper Co. Ltd.

1981 Volume 35 Issue 6 Pages 509-514
Published: June 01, 1981
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.2524/jtappij.35.509

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Tokyo Mill started its operation in 1966 is located on Soka City in the east of Tokyo. Tokyo Mill manufactures jute liner board and gypsum liner board with TCC Former (Takasaki Combination of Centri Former) witch are converging curved wire former.
The mill site area is about 70, 000 m² and the employees are 95.

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The Effect of Ozone Treatment on TMPs Produced at Various Defibrating Temperatures

Takamasa Kubo, Jun Hosokawa, Takeshi Kobayashi, Isao Akamatu, Yutaka K ...

1981 Volume 35 Issue 6 Pages 515-523
Published: June 01, 1981
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.2524/jtappij.35.515

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In this paper, the effect of first-refining temperatures on ozone treatment was investigated for thermomechanical pulps which were defibrated under the conditions of first-refining temperatures at 105, 125 and 160°C, and then treated with ozone. Further, another aim of this paper is to elucidate the cause of high sheet strength in ozone-treated thermomechanical pulps.
In ozone treatment of thermomechanical pulps, the pulp yield and bleachability were not influenced by the difference of first-refining temperature, but the brightness of each pulp was raised by only two points by the addition of 4% ozone on pulp.
Characteristics of pulp sheet such as breaking length and folding endurance of pulp sheet except for tear factor tended to increase for all pulps defibrated at 105, 125 and 160°C after the pulps were treated with ozone. However, as for the tear factor, it was increased by the addition of ozone in case of pulps defibrated at 105 and 160°C, but decreased in case of pulp at 125°C. The difference would depend on the gap of the tear factor in the thermomechanical pulps untreated with ozone.
It was found that the increase of sheet strength by ozone treatment was mainly attributed to a large amount of film-formation among fiber, which was confirmed by scanning electron micrography.

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Studies on Cause of Deterioration to Air-Elementsfor Deinking, and on Washing

Masukichi Nakamura, Toshio Yamazaki

1981 Volume 35 Issue 6 Pages 524-530
Published: June 01, 1981
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.2524/jtappij.35.524

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Polyethylene air-elements used in the floatation deinking method are susceptible to decreases in the flow of air, the bubbling property and the strength of polyethylene in the process of deinking.
Contaminants consist of precipitated materials on outer and inner surfaces of the tubular elements and of plugging materials made of unsoluble silicates inside of the elements. The contaminants seemed to be derived from the reaction product between carbon dioxide in the air and sodium silicates in the furnish.
The flow of air can be completely recovered without impairing polyethylene by means of immersing it into hot alkali and an acidic sodium fluoride to remove organic materials and silicates in the plugging contaminants.
In order to prevent the air-elements from plugging, it is recommended to use the air free from carbon dioxide and or a deinking formulation excluding sodium silicates. The decrease in the strength of tubular elements seemed to be caused by the deformation of polyethylene, which was confirmed by the electron microscopic observation.

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Process System Approaches for Resources Recycling in Pulp and Paper Industries

2 nd Report : Time Series Analysis of Waste Paper Recycling System

Hiromu Ohno, Fusao Yoshida, Iori Hashimoto, Siuteaki Shioya, Takeichir ...

1981 Volume 35 Issue 6 Pages 531-537
Published: June 01, 1981
Released on J-STAGE: January 29, 2010

DOIhttps://doi.org/10.2524/jtappij.35.531

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In recent years, the recycle utilization of resources has been of great importance as an effective measure for the solution of energy, resources and environmental pollution problems. With this context, the recovery and utilization of waste paper have tended to increase in many countries.
This 2 nd report is concerned with data analysis of waste paper recycling and utilization in pulp and paper industries. Five kind of variables, amounts of paper production and shipment, pulp and waste paper consumption, and waste paper purchase are analysed by using a method of time series analysis to forecast future values of paper production and waste paper consumption. Paper production in Japan will be increase up to 24 ± 6 million tons, and amount of waste paper consumption in paper production will increase up to 12 ± 3.8 million tons. Thus, waste paper utilization ratio willbe 50 %. These forecasted values include steadily growing trend, business fluctuations and irregularvariations.

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[title in Japanese]

[in Japanese]

1981 Volume 35 Issue 6 Pages 538
Published: June 01, 1981
Released on J-STAGE: November 13, 2009

DOIhttps://doi.org/10.2524/jtappij.35.538

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