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Volume 47, Issue 7
Displaying 1-14 of 14 articles from this issue
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Kazuhiro Shoji1993 Volume 47 Issue 7 Pages 811-826
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (2518K) -
Y. Abe, H. Todoroki, W. Okazaki, T. Inadome, A. Sakamoto1993 Volume 47 Issue 7 Pages 827-836
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSStock flow velocity was measured with a jet velocity meter system in various operating conditions of industrial headboxes. Edge flow made the flow directions of both machine sides more inner, and side bleed made them more outer. Larger recirculation inclined the flow direction to the overflow direction. Slice opening profile affected the flow direction, too. These flow behaviours were reflected in fiber orientation of paper. Experiment was performed with changing the differential vector between stock flow velocity and wire velocity. It was suggested that fiber orientation of paper is mainly determined by the relative movement of stock flow to wire at J/W≠1 rather than by the fiber orientation in jet. Furthermore, the z-directional profiles of fiber orientation in x-y plane in papers made by commercial paper machines were measured by a newly developed method. The information of the differential vectors on sheet forming can be obtained from these z-directional profiles.View full abstractDownload PDF (1506K) -
Effect of Retention AidsH. Kaji, K. Monma, T. Katsura1993 Volume 47 Issue 7 Pages 837-844
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSA number of factors affect flocculation. The influences on flocculation by these factors have been estimated by the coefficient of variation of the transmitted light intensity or gray level and the distribution of floc size. These factors affect not only the floc size distribution but also the shape of flocs. It was found that the fractal dimension can express the floc shape of areas which vary from 1 mm2 to 300 mm2.
The energy given to a pulp slurry on a paper machine can be divided into two processes : one used to weaken and/or activate the network and rupture the flocs, the others used to build-up the flocs. As the floc formation proceeds, the shape of flocs tends to become simpler. On the other hand, as the dispersion proceeds, the shape of flocs tends to be more complicated. The shape of flocs is a result of the equilibrium of the forming and dispersion processes. When we compare single and dual system in retention aid, the flocs in dual system have simpler shape and smaller average floc size than single system at the same level of coefficient of variation. The difference in behavior of floc size distribution and floc shape against the shear force may be caused by the difference in the mechanism of flocculation. The shape of the floc is a good index to describe the conditions of the slurry such as the distribution of floc size and the coefficient of variation.View full abstractDownload PDF (3114K) -
The optimum coater head by the latest technologyKouichi Yuuki1993 Volume 47 Issue 7 Pages 845-849
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe OptiCoat coating station is an entirely new unit that has been advanced even further from our earlier reliable and proven solutions. The coating color nozzle application and the control of the coating amount have been divided into separate functions in coating station. Therefore, both functions can be optimized in relationship to the demanding properties for the ideal coating of various paper and board grades. Then the OptiCoat reaches high coated quality and uniformity at high running speeds.View full abstractDownload PDF (557K) -
Hideo Tsunakiri1993 Volume 47 Issue 7 Pages 850-855
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe paper machine No. 8 of Kishu Mill started up from March 1989 and has been operating successfully.
This report is described on the operating experience of Acdeflo and Bel Form from start to now.View full abstractDownload PDF (3613K) -
Nobutaka Hiromatsu1993 Volume 47 Issue 7 Pages 856-861
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe paper machine N 1 of Nohmachi Mill started up from July 1991 and has been operating successfully.
This report is described on the operating experience of N 1 machine from it's start to now.View full abstractDownload PDF (2126K) -
Ikuro Seino1993 Volume 47 Issue 7 Pages 862-867
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSSumitomo Heavy Industries Ltd. has been exclusive licensee of Sunds Defibrator AB in the field of chemical pulping to Japanese market since 1988, at that time the development of a new cooking process was started in Sunds Defibrator.
In general, batch cooking has always had the advantage over continuous cooking by providing more flexibility in the operation of the digesters except lower energy efficiency.
This is especially when switching cooking would be done between different wood species and less homogenous and poor quality wood would be used as raw material.
Therefore, the Super Batch process was developed as a cooking system with energy consumption equal to or lower than that of continuous cooking.
The recent results obtained by means of the Super Batch cooking have shown that there are no major obstacles in taking both softwood cooking and hardwood down to the kappa number range of 10-15.
It is of primary importance that simultaneously the pulp quality is preserved and no excessive yield losses can be tolerated.
Mill scale trials show that this pulp is at least of equal quality compared to standard market pulp and it can be bleached to full brightness without molecular chlorine. Moreover this kappa level seems to be the key to reach full rightness in totally chlorine free bleaching. This fact is very important in view of environmental requirement.
This paper introduces the outline of the Sumitomo/Sunds Super Batch process and total fiber line technologies with the Super Batch.View full abstractDownload PDF (851K) -
F. Hoshino, S. Fukaya, T. Yanagihara1993 Volume 47 Issue 7 Pages 868-871
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSEffects of the particle size of plastic pigment on sheet gloss and structure of coatings which were constituted of clay/plastic pigment/binder were studied. The most effective particle size for sheet gloss was about 200 nm and the ranking of the size for sheet gloss did not vary before and after supercalendering. In addition, such ranking was not affected by the king of binder coexisted in coating.
From structural analysis, it was found that the coating having highest sheet gloss showed highest degree of orientation of clay particles, highest surface smoothness in submicron range, and lowest surface concentration of plastic pigment.
Those results indicated that clay/plastic pigment packing manner, which would affect the orientation of clay particles and the surface smoothness, was a dominant factor for sheet gloss development rather than thermoplasticity of plastic pigment.View full abstractDownload PDF (1885K) -
Kenji Higuchi1993 Volume 47 Issue 7 Pages 872-875
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSIn this high rate filter, bundles of lond fibers are fixed at their lower end portions but free-standing at their upper end portions. Feed water is passed downward through the fiber bundles with suspended solids in the feed water being captured in the interstices between the fibers. As the filtering process proceeds, the lower portions of the fiber collapse with the result that suspended solids in the feed water are arrested very effectively due to the higher fiber density in the lower portion of the filtering media. The filtering process is terminated when the pressure drop through the filtering media has reached at a predetermined value. Then, the fiber bundles are backwashed with water (filtered water) and air. Upon backwashing, the fiber bundles are fully extended, and release deposited solids. The filter is ideally suited for treating white water for its recovery and clarifying river and industrial water.
Performance
Feed Water Turbidity : less than 50 mg/l
Treated Water Turbidity : less than 2 mg/l
Flow Rate 20100 m/hr.
Backwash Time : 6 minutes
Characteristics
The use of long fibers (polyacrylnitrile) permits the filtering process to occur at flow rates far exceeding those of the conventional sand filter. The higher flow rates achievable with this filter results in significant savings in space requirements. Being fixed to the filter bottom, the fiber bundles stay put even when backwashed at exceedingly high flow rates, which in turn results in a short duration of backwash. Standard and skid-based filter units are available. Therefore, these filter units can be installed with a minimum of site work. The fiber filtering media are resistant to any chemical attacks, and therefore can be used for treating not only process water and white water but various waste waters as well.View full abstractDownload PDF (647K) -
Rune Hillström, Svante Nilsson1993 Volume 47 Issue 7 Pages 876-880
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSGötaverken Energy AB in Sweden had developed the new black liquor recovery system, CHEMRECTM, which is based on black liquor gasification.
The first commercial CHEMRETM kraft recovery booster plant, capacity 34 t·DS/h at Frövifors Bruk in Sweden was successfully started up in May 1991 and the continuous operation was initiated in August the same year.
CHEMRECTM booster is one of the applications of the system and gives incremental recovery capacity expansion in mills where recovery boilers are undersized.
In the paper, the development history of CHEMRECTM, the operating results at Frövifors are summarized and the new standard CHEMRECTM booster plant is introduced.View full abstractDownload PDF (6713K) -
1993 Volume 47 Issue 7 Pages 881-885
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (8060K) -
[in Japanese]1993 Volume 47 Issue 7 Pages 886
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (167K) -
(Part 2) Verification by the experimental paper machineAkira Eguchi, Toshimi Tajima, Norio Fujita, Tetsuo Makino1993 Volume 47 Issue 7 Pages 887-899
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSIt is suggested that fiber orientation have relation to a shear force and shear direction in the stock at the forming section after jet trapping on the wire. This mechanism would be mainly influenced by a flow velocity and direction of a stock jet from headbox.
This paper shows about the jet flow characteristics relation with edge sides flow rate increase, side bleeds flow rate change, slice lip profile, using a 500 mm pond width experimental headbox. And further, paper making trial was made and the fiber orientation mechanisms are studied.
At the result of the flow characteristics test and the paper making trial study, the fiber orientation could be controlled with the edge side flow rate, bleed flow rate.
To improve the fiber orientation, it is most important to reduce a cross flow, especially the edge sides flow, of the jet.View full abstractDownload PDF (3387K) -
[in Japanese]1993 Volume 47 Issue 7 Pages 900-907
Published: July 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (1341K)
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