All issues
Volume 47, Issue 8
Displaying 1-13 of 13 articles from this issue
- |<
- <
- 1
- >
- >|
-
Kokki Sakai, Ryuichiro Kondo1993 Volume 47 Issue 8 Pages 933-943
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSReviewed are our studies on the biomechanical pulping, biobleaching, and biological treatment of bleach effluent using ligninolytic fungi.
A fungal treatment of the coarse mechanical pulps with fungus IZU-154 significantly reduced the refining energy and improved the strength properties of the mechanical pulps. Note that no addititives or nutrients were added prior to the fungal treatment.
Pulp brightness was greatly increased when the fungus IZU-154 or KS-62 was used to directly bleach hardwood and softwood kraft pulps. Combined fungal and chemical bleaching could greatly reduce the use of chlorin-based chemicals and the pollution load of waste liquors from bleaching processes. Chlorine-free bleaching became possible when the two-stage fungal treatment was performed on oxygen-prebleached kraft pulp.The biobleaching did not seriously affect the strength properties of bleached pulp.
The color of the pulp bleaching effluent was reduced when incubated with the fungus IZU-154 or KS-62. Decolorization with IZU-154 was enhanced if glucono-d-lactone, acetic acid, or glucose was added to the incubation system. It should be noted that the fungus KS-62 did not require any additives or nutrients in decolorizing the bleach effluent. This fungus was also able to decrease the COD and AOX of the effluent.View full abstractDownload PDF (1866K) -
Jeff Mayovsk1993 Volume 47 Issue 8 Pages 944-949
Published: August 01, 1993
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSWith the growing environmental concerns facing the pulp and paper industry, there is a need to lower digester kappa to reduce the amount of organics to the bleach plant. There is also a need to maintain a satisfactory yield. To address these concerns, a pulping study comparing polysulfide and polysulfide-SAQ to kraft and kraft plus SAQ was conducted. A western United States softwood mixture was cooked over the range 15 kappa to 30 kappa. The effect of these additives on pulp yield is that the polysulfide and SAQ produce similar yield increases compared to conventional kraft for the kappa range 20 to 30. At 15 kappa the polysulfide pulping results in a superior yield increase compared to SAQ. The combination of SAQ with polysulfide liquor results in a synergistic effect that increases with kappa for the range studied. The pulping results and physical property comparisons of polysulfide, polysulfide-SAQ, SAQ, and conventional kraft are discussed.View full abstractDownload PDF (1226K) -
Satoru Iwasa1993 Volume 47 Issue 8 Pages 950-955
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSWith the growing environmental concerns facing the pulp and paper industry, saving energy, an effective use of resources, utilization of waste paper and lightweight paper and paperboard come to tay as countermeasures. Use of recycled waste water and progress in closed system increasingly worsen water for papermaking.
The contribution to environmental concerns and new application to a coating chemical with the new PAM strength agent are outlined as compared to starch which brings disadvantage, for instance the complicated process of cooking, a declining rate of increase in strength at high addition levels and a rise in waste water load (COD).
Additionally, Neu Size 770, which can compare alkaline sizing agents (AKD, ASA) in sizing efficiency in neutral as well as alkaline paper making conditions without deposits and/or slippage problems, is summarized.View full abstractDownload PDF (1008K) -
Formation and Physical Properties of Woodfree Coating Base and Fine Paper from No.2 PM of Nippon Kakoh Seishi K. K.Takao Abe1993 Volume 47 Issue 8 Pages 956-959
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSExisting No.2 paper machine of fourdrenire and open draw type mainly producing woodfree coating base paper ranged 80 to 210g/m2 of basis weight had been rebuild to IHI-Voith Duoformer-D for the purpose of improving sheet formation without diminishing the other physical properties.
As the result of rebuilding, sheet formation had been greatly improved through the installation of a D-section on existing fourdrenier and also maximum basis weight reached up to 275g/m2 and more.View full abstractDownload PDF (762K) -
Philip C. Norrdahl1993 Volume 47 Issue 8 Pages 960-966
Published: August 01, 1993
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSThe effect of different drying configurations and drying profiles on offset print mottling was studied on a pilot coater utilizing a drying simulation program and a laboratory sheet fed four color offset print. The existence, as well as significance, of a drying critical area was demonstrated. The key factor in drying critical area is the coating color solidification process. On the base stock/coating color combination studied the critical solids content starts at 73% and ends at 81%. During this drying phase, specific evaporation should be low and rates of about 15kg/m2h or higher clearly will increase the print mottling.
The drying energy source had little influence on the print mottling tendency. However, for the best print and paper gross combined with least print mottling, a drying concept including both infrared and air dryers is recommended.View full abstractDownload PDF (1725K) -
Yasushi Kitamura1993 Volume 47 Issue 8 Pages 967-972
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSSome kinds of surface coating methods such as plating, thermal spraying and ion plating have been tested for prolonging life of coater blades. It is found that special chromium plating is best coating of them for wear resistance. In addition to coating methods, it is very important for coating profile to be adjusted to types of coaters.View full abstractDownload PDF (1400K) -
Hiroyasu Hayano1993 Volume 47 Issue 8 Pages 973-976
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSWe have installed two high speed full synchro folio sheeters of/Maruishi in order to modernize finishing room in Nichinan mill, Oji Paper Co, Ltd.
The skid ratios which need not be sorted reaches 99 percent and 73 employees were reduced.
We achieved the original plan of improving the accuracy of sheet sizes after cutting as well as getting higher yields in salable products.View full abstractDownload PDF (600K) -
Hitoshi Takano1993 Volume 47 Issue 8 Pages 977-982
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSWe have developed the remote support function which improves system maintenanability for B/M 7000 XL.
Both corrective maintenance and preventive maintenance can be performed quickly. In addition, this function is provided with the remote tuning capabilty and operational advice to satisty the curent operation of condition.View full abstractDownload PDF (2110K) -
N. Ozaki, K. Tateoka, S. Hayashi, W. Shinohara1993 Volume 47 Issue 8 Pages 983-987
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe idea of applying intelligent control using neural networks and fuzzy logic to actual plants, where modern control theory is not powerful enough, is becoming popular. This paper presents one example applied to a recovery boiler in paper pulp mill.
A recovery boiler aims to generate steam and to collect expensive soda, which is a waste from chemical reaction at the previous process. Experts still exist to operate the plant efficiently because of its process's complexity. Among them are the operators' actions based on the visual perception of the charbed. In order to reduce these operators' burden, control algorithm handling both conventional process data and image data is discussed in this paper.
The control algorithm, visual feedback control, has two part. One is the perception of the charbed's shape organized by Neural Networks and the other is fuzzy control system based on operators' experience.
First we discuss the present plant operations done by operators and point out the possibility of automatic manipulation. Next, explain the detailed algorithm including how we implemented neural networks and fuzzy logic. Finally the result of control to the plant is discussed.
Due to the kindness support of a certain user, we have implemented this algorithm and evaluated to the actual plant.View full abstractDownload PDF (980K) -
1993 Volume 47 Issue 8 Pages 994-1000
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (3084K) -
[in Japanese]1993 Volume 47 Issue 8 Pages 1001
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (260K) -
Toshiharu Enomae, Fumihiko Onabe, Makoto Usuda1993 Volume 47 Issue 8 Pages 1002-1013
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe geometrical profile and the latex concentration of the coating/basepaper interface, namely, interface morphology were studied. The interface roughness supposed to concern mottling was measured by a topographic SEM system or stylus instrument for coated papers with different basepaper roughness. In the wavelength range below 150μm, the roughness of the interface profile corresponded to that of the basepaper before coating. On the contrary, above 250μm. the smoother the basepaper before coating, the rougher the interface profile. The wetting deformation was expected to occur in a floc size scale, not in a fine scale such as fiber size. The latex concentrations of both sides of coatings were also compared. Starch accelerated the migration of SB-latex in the hot air drying. However, the interface of the coating with high surface latex concentration does not always have low latex concentration. It implies that the latex concentration profile of the interface side of coatings is not influenced by the drying condition.View full abstractDownload PDF (3050K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1993 Volume 47 Issue 8 Pages 1014-1022
Published: August 01, 1993
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (1798K)
- |<
- <
- 1
- >
- >|