2014 February JAPAN TAPPI JOURNAL
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Vol.68, No.2 Abstracts


Web Gauging System at a Glance

Yuki Hashimoto
Kobayashi Engineering Works, Ltd.

  Recently, in the paper industry, a population of experienced staff is decreasing year by year, and succession of operation technique poses a problem.
  The industry was supported by craftsmanship of each of operator. Considering actual condition, QCS (Quality Control System) is really needs to help operation by insufficient experienced operators.
  Our company is tying up with NDC infrared engineering (the following NDC is called) lineup the excellent system in this field, and wants to offer the system to the users of the paper industry. We focus to measurements of basis weight, moisture, thickness, then can offer excellent performance with reasonable prices.
  Furthermore, it became possible to reduce sharply the failures by reducing the parts mark of system. We hope that if a system is introduced, user will get quality improvements, claim reduction and overall cost reduction.
  Moreover, we provides to after-sale service including the correspondence in the engineering service such as arrangement of apparatus, improvement of equipment for conveying paper threading tail, erection work, test run adjustment, preventive maintenance and emergency call.


Belt for Extreme shoe press conditions
- BlackBelt E -

Tetsuro Endo
Valmet K.K.
Satu Hagfors
Pulp, Paper & Power, Metso

  Centrifugal casting in a cylindrical mould is the newest method to manufacture shoe press belts. Belts are usually made of polyurethane elastomers reinforced with synthetic yarns, either as a woven base fabric or as straight yarns in two or three layers. Grooved belts are used to get nip dewatering. Groove shape and dimensions are selected based on the requirements of the machine and paper grade.
  Belt wear may be affected by paper machine speed, load, filler content, washing agents used, elastomer material and the reinforcement of the belt. There is a relationship between the shoe press load and the belt stretching: Stretching will increase when the load is increased. This is due to the Poisson effect: when an incompressible material (like polyurethane) is compressed thinner, it will stretch to the other direction. Stretching in the nip causes speed difference in the shoe press and this will enhance belt wear. High modulus reinforcement decreases belt stretching in the nip.
  Good results have been obtained with high modulus yarn reinforced belts fast board and paper machines with shoe presses where standard belts wear or crack.


Solution for Sheet Breaks and Paper Defects by Canvas Passivation Technology

Ryoma Akutsu
Chemicals Development Team, Maintech Paper Tech Co., Ltd.

  In recent years, paper makers have focused on production efficiency and manufacturing cost, even though the paper-making condition has been deteriorated year by year, for example OCC grade down and increase of recycled magazine in the furnish, reuse of recycled fiber and so on. These conditions lead to serious deposit problems in dryer section which cause sheet breaks or defects in a finished paper. Not a few fabric cleaner are used in the machines but have not met paper makers requirement.
  This report introduces a development of a passivation chemical nCleanKeepr®" which works efficiently with any kinds of dryer fabric cleaners. Examples applied in paper machines are also presented.


Simple and laboratory-Scale Coating Machine
-Introduction of "Coating Unit"-

Masaru Futaba
Nomura Shoji Co., Ltd.

  Sumet in Germany released its latest model of the Laboratory-scale coating units. The standard coating unit is equipped with application roll, backing roll and a rod for removing excessive chemicals before coating. It can be used as size press and film press. Optionally, it can be used as a blade or metering rod for coating. Infrared dryers and hot air dryers are used for drying the test strips. The integrated touch screen is used to control the dryers, as well as speed and compression force. The sample is automatically pulled through the coating unit. The coating rolls and coating container can be removed quickly from the unit to ensure easy cleaning. Therefore this type of coating unit is suitable for coating many different kinds of chemicals with only a little amount of coating color. The same condition of coating as well as coating amount can be reproduced exactly as long as the parameters are kept same. These parameters include roll to roll and rod contact pressure, dryer intensity, speed and so on. In this article, the standard type for cut sheet coating and optional type for On-line for roll sample coating are introduced.


Introduction of Automatic Filter
-Applications and References of Non-Electric/Self-Cleaning Filters-

Daisuke Inoue
Ecological & Industrial Machinery Dep.,Itochu Machine-Technos Corporation

  The development of water treatment technology has been contributed to the reduction in water consumption. Water use reduction and cost reduction can be achieved not only by membrane technology but also by appropriate methods of water treatment.
  In this paper, "automatic filter" and its applications in paper and pulp industry are introduced. It is non-electric and self-cleaning filter that mainly uses water pressure for filtrating and cleaning. There is a wide range of applications including intake water and cooling tower filtration.


Technology Development in Tissue Making and Things Europe

Dairo Tomita
RIKENGREEN CO.,LTD.

  Rikengreen offers the most advanced paper chemical technologies in Japan under exclusive license from the global leading company, Ashland Hercules Water Technologies.
We offer every chemical product and its application technique required from pulping operation through comprehensive paper making. We are confident in helping and assisting the mills optimal operations with our specialties; the best fit application techniques based on the knowledge of whole process of the paper making operations and the quick understanding of the specific feature of the individual machine and its environmental requirements.
  In this report, we would like to present the state-of-the-art tissue technologies using the new, fully cross linked coating agent and the low AOX wet strength agent from European industry.


Total Solution of Papermaking Machine by New Type Wet-End Improver

Hiroyuki Oishi, Koichi Tadaki, Kazutaka Kasuga and Yukihiro Fujita
Technical Dept., SOMAR Corporation

  In recent years, the effect or performance of various wet-end chemicals has been
weakened, because of the closed system of papermaking machines, recent poorer quality
of pulp materials and other factors mentioned later. Especially, the dosage of the wet-end chemicals such like retention aid, paper strong agent, and sizing agent has increased to show their further more effect, in response to the higher dosage of waste paper and fillers. That resulted in stain of papermaking equipment, and defects of paper surface.
"REALIZER A Series" which our company has developed, is an effective / practical
high-performance coagulant and special cationic polymer to applied to pretreatment process of pulp materials. On the other hand,"REALIZER R Series, FX Series"is a high molecular special polymer with various structure which enables to achieve excellent retention with small dosage.
  Wefd like to emphasize the New type Wet-end System, the unique usage system, that is, using together"REALIZER A Series","REALIZER R Series"and "FX Series". It would be noted that we named the unique system"AXISZ SYSTEM"and R & D has been still working for farther better runnability and productivity.
  In this paper, we'd like to introduce the characteristics of the abovementioned and newly developed systems.


Adaptable Paper Strength Agents for Papermaking of High Electrical Conductivity

Takashi Minabe
Research and Development Department, Paper Chemicals Division,Arakawa Chemical Industries, Ltd.

  In recent years, paper making systems have been changing from the viewpoint of environmental protection and cost reduction. Recycling rate of used paper has been increasing, and fiber quality has become worse. For a reason of operation cost reduction, consumption of fresh water has also been restricted. Under such highly closed wet-end condition and high electrical conductivity, various wet-end additives or internal wet-end agents cannot show desirable performance.
  We developed powerful internal paper strength agents which show higher retention rate than conventional chemicals under high electrical conductivity. A new internal paper strength agent (amphoteric PAM) can form a polyioncomplex under high electrical conductivity because of increasing ionic charge density in the polymer. In addition, we also developed a paper strength agent of spray type for papermaking of high electric conductivity. Combination use of internal additives and spray type paper strength agent, it is capable of exhibiting the higher paper strength effect than use of internal additives only.


Optical Bleach Plant
-Pulping Process Control by In-Line Optical Transmitter-

Keijiro Suzuki
BTG Japan, Spectric Co., Ltd.

  In this paper I present the new concept "Optical Bleach Plant"which has great possibilities to measure the pulp characteristics and control the process in fiberline instead of the method in past year. The fiberline process is the "key"of papermaking process and has a big effect on the whole of papermaking pr if the fiberline process is stabilized or variating. In other words, in the fiberline there are big potentials which will affect on the quality of products and its profitability. It is my great pleasure if I can show the "thread of light"to improve your fiberline process with our new concept and technologies.


For Sound or Noise in Industrial World Part VI
- It Thinks about the Noise as Part of T.F.O from SKF -

  "For sound or noise in industrial world" is the five in this time. This explanation is a noise by the contamination. The contamination accounts for 14% of the whole of the problem that the damage at the early stage of the bearing doesn't reach the calculation longevity. The contamination exists from small one to the big one, and from rigid to soft. And, there is the solid and liquid. I present the example of the soft solid one by this contamination, deprave the longevity of the bearing by it, and tell how the noise is generated.


Fully Split Seal for Agitators Services
-Type-37FS Fully Split Seal-

Takahiro Hayashi
EU Engineering Dept. John Crane Japan, Inc.

  Retrofit shaft seal from gland packing to mechanical seal in pulp and paper mills is proceeded but it is only limited to the major machines such as pumps for cooking and chemical or refiners. Gland packing is still applied in raw material tanks or horizontal agitators for chest.
  This is because the horizontal agitators often occur shaft runout and vibration. These factors are long deflecting shaft and changing tank liquid level, etc. So, it is thought that mechanical seals cannot be applied.
  However, there is a mechanical seal that can absorb such shaft runout and vibration by using rubber bellows. Furthermore, fully split design can reduce cost and time of the maintenance.
  We would like to introduce the fully split mechanical seal which can be applied accommodate the shaft runout and vibration for horizontal agitators with actual experiences.


A Report on ISWFPC 2013
-June 12-14, 2013 at Vancouver, Canada-

Shiho Takahashi
Forestry and Forest Products Research Institute

  ISWFPC 2013 (The 17 th International Symposium on Wood, Fiber, and Pulping Chemistry) was held in Vancouver, Canada hosted by PAPTAC (Pulp and Paper Technical Association of Canada). Total participants were 183 people from 16 countries. There were 91 oral presentations on 11 sessions and 103 poster presentations. Summaries of several presentations regarding biorefinery, pulping and bleaching, and lignin chemistry were introduced in this report.


A report on 15th Fundamental Research Symposium
"Advances in Pulp and Paper Research"
|September 9-13, 2013 at Cambridge, UK|

Minoru Kimura
The University of Tokyo

  15th Fundamental Research Symposium "Advances in Pulp and Paper Research" was held at Cambridge, UK on September 9|13, 2013 hosted by The Pulp and Paper Fundamental Research Society. Total participants were 110 people, and 42 oral presentations including a keynote address and 3 reviews were conducted togather with 11 poster presentations. Summaries of several presentations and personal
impression on this symposium will be reported.


Corporate Profile & Products Information (9)

KURITA WATER INDUSTRIES LTD.

  KURITA WATER INDUSTRIES was established as a boiler chemical supplier in 1949. For more than 60 years since its establishment, Kurita has been contributing to the development of industry and society by providing solutions to customerfs problems as a leader in the fields of water and the environment. Defining our corporate philosophy as "Study the properties of water, master them, and we will create an environment in which nature and man are in harmony." We are aware that the Kurita Group has a mission to create new solutions to different issues involving water and the environment.
  Given that water resources are limited, it is essential to make effective use of water and to establish a continuous cycle of clean water to and from nature for repeated utilization. On the basis of its accumulated water technologies, Kurita will devote all its strength to helping to resolve various issues in the field of Pulp and Paper Industries.
  In this article, we would like to introduce our corporate profile as well as the technical trend and the recent development of water treatment chemicals for pulp and paper making process.


Research Report(Original Paper)

Moist Heat Accelerated Ageing Test of Naturally Aged Paper: Predicted Initial Physical Properties and Degradation Rate Indicator at Room Temperature by the Result of Suspension Method

Kang Lee and Masamitsu Inaba
Graduate School of Fine Arts, Tokyo University of the Arts

  In order to take measures for preventing degradation of paper whose permanence is low, like acid paper, and saving them in a better state for a long time, it is preferable to estimate the natural ageing rate of various types of papers and to predict their life expectancy. Conventionally, the permanence of paper is evaluated by artificially ageing paper at a single temperature, but it has been reported that if paper deteriorates differently at different temperatures, the assumed permanence of paper at a single high temperature will differ from that at room temperature.
  Thus, in this research, 11 naturally aged books from the Journal of the Chemical Society published in Britain that had deteriorated over time for 130 to 80 years were selected and further aged artificially under 4 temperature conditions between 60 and 90 (65%r.h. constant). It was possible to obtain the degradation rates of tear index, burst index, degree of polymerization and discolouration at room temperature by Arrhenius plots with high correlation coefficient (more than 0.97). Initial physical properties were calculated by estimated degradation rates, current physical properties and time that elapsed from the publication of the sample books. The degradation rate indicator (degradation rate constant divided by tear or burst index) were calculated as in our previous research, since the higher the physical properties, the lower the degradation rate of
tear or burst index was. Better correlation was observed between the concentration of hydrogen ion before moist heat accelerated ageing and the degradation rate indicator of the physical properties of paper at room temperature than at higher temperature.