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Volume 48, Issue 2
Displaying 1-12 of 12 articles from this issue
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Water penetration, apperance of sizing features, and sizing mechanism of alkylketene dimersAkira Isogai1994 Volume 48 Issue 2 Pages 271-287
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSPaper sizing is reviewed in terms of water-penetration theory, retention of sizes in sheet, distribution of sizes in sheet, and sizing mechanism of alkylketene dimers, on the basis of recent publications and our experimental results.View full abstractDownload PDF (5700K) -
Raysabro Oye1994 Volume 48 Issue 2 Pages 288-297
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSIt can be stressed that paper and paperboard are based on renewable bioresouces and environmentally friendly products. In this meaning, utilization of pulpwood from sustainable forest is more significant.
Utilization of eucalyptus woodchips from Australian natural forests has been spread since a quater of a century in Japan. However, the share of Australian woodchips is declining and the amount of plantation eucalyptus chips from South Africa, Chile, China, Thai and Vietnam is expanding.
Some comparisons on pulping quality of plantation eucalyptus carried out at four papermakers were shown in this paper.
It can be said that pulping quality of wood should be considered as one of the most important factor in selecting wood species for eucalyptus plantation.View full abstractDownload PDF (1239K) -
Haruo Tsukamoto1994 Volume 48 Issue 2 Pages 298-304
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
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Noriji Miyabe1994 Volume 48 Issue 2 Pages 305-316
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSJapan TAPPI gave praise to Mr. Morizane, the president of Shinhama Pump Mfg. Co., Ltd., who developed the new flotation cell which was based on his own idea.
The kneading process is used to improve the quality of deinked pulp by helping to release the ink particles from the surface of the fiber.
A certain portion of the ink particles are small in size. These small particles are difficult to remove by conventional flotation cells.
It has been proven in both pilot plant and commercial scale runs that the new type of flotation cell has excellent small particle removal efficiency.
This makes it possible to reduce the amount of wash water required and, to potentially reduce the size of the washer itself.
The new “Hi-FLOTATOR” has other advantages apart from excellent ink removal, these include clean operation, compact design, reduced maintenance and increased energy savings due to fewer motors and pumps.
To date, Nippon Paper group has installed 11 “Hi-FLOTATOR” plants in 8 mills. In this paper, I will show some comparisons between the “Hi-FLOTATOR” and other flotation cells thats are in operation in our mills.View full abstractDownload PDF (1078K) -
Evolution and DesignHideomi Uchikawa1994 Volume 48 Issue 2 Pages 317-320
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe Therma-Jet Cross Direction Caliper Control System was designed and developed by Impact Systems Inc. to overcome the limitations of conventional CD Caliper Control Systems and achieve high performance CD Caliper Control or paper and board machines. This goal has been reached. The Therma-Jet is now installed on more than 200 paper and board machines worldwide, continuously provides up to 80% reductions in CD Caliper variations.
Impact Systems Inc. has already received at U. S. Patent for Therma-Jet, and in Japan a patent was issued in 1992. Over the years, Therma-Jet has also undergone numerous design improvements allowing for an even broader range of applications. For example, the Actuators feature multiple jet nozzles and higher powered heater coil, which produces higher temperature differentials and efficiencies. This has resulted in the successful implementation of Therma-Jet Systems on both hot roll and soft roll calenders, where roll temperatures are high and very accurate roll surface temperature control is vital. Typical results on fine paper and newsprint are shown in figures 7 and 8.View full abstractDownload PDF (2386K) -
IM-3 SCV, IM-3 SRVFuji Technica Co. Ltd1994 Volume 48 Issue 2 Pages 321-323
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
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Shigeo Matsushima1994 Volume 48 Issue 2 Pages 324-343
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSMechanism of mechanical strengths is discussed for corrugated fiberboards of single face, single wall and double wall. The strength under the tensile load is discussed by the experimental results of the tensile deformation. Their strengths under the surface compression and the uniform bending made from the applied moment of the axis along the machine direction are discussed by elastic theory. Different mechanism of the strength is denoted for the deifference of the fiberboard.
From the mechanism, the argument of the design for their fiberboards is performed on obtained effective results. And the determination of the reasonable shape for their fiberboards is studied from the obtained stress behavior.View full abstractDownload PDF (2482K) -
1994 Volume 48 Issue 2 Pages 344-352
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
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[in Japanese]1994 Volume 48 Issue 2 Pages 353
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
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Takanori Miyanishi1994 Volume 48 Issue 2 Pages 354-359
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe technology to analyze the short-term basis weight variation and the long-term variation of relevant paper machine process variables was developed. A number of measured data were stored in a database for several weeks. By the proper interpretation of accumulated data, it was found that the paper quality problem derived from the interaction of short-term and long-term process variation. The developed system quickly identified the causes of the problem and appropriate corrective action was taken to eliminate the bottlenecks in optimum paper machine operation.View full abstractDownload PDF (1090K) -
Evaluation of the Factors Affecting Print Mottle and Consideration of Coating Structure Formation ProcessHideyuki Matsubayashi, Toshihiro Inoue, Yoko Saito1994 Volume 48 Issue 2 Pages 360-367
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe effects of a variety of coating conditions on Croda ink mottle were examined. Point-to-Point analyses and comparisons of Croda ink densities, surface latex concentration, and coat weights facilitated the following conclusions ; Croda ink density correlated better with coat weight than with surface latex concentration. The more the coat weight, the less the Croda ink density. The best relationship for degree of Croda ink mottle was the line gradient for the regression between ink density and coat weight. It has been found that the smaller the line gradient, the less the print mottle. The smaller line gradient means that ink density fluctuates little even when the coat weight changes. It was effective to use the low Tg latex, the high drying temperature or short the dwell time to make the line gradient smaller.View full abstractDownload PDF (1073K) -
1994 Volume 48 Issue 2 Pages 368-375
Published: February 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (1413K)
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