2013 February JAPAN TAPPI JOURNAL
 
2013 February JAPAN TAPPI JOURNAL

Vol.67, No.2 Abstracts


Characterization of Eucalypt Elite Trees for Pulp Production in Northern Brazil

Yujiroh Fukuda, Tomotaka Shinya, Eiji Iwata, Kazunori Hayashi, Shinichi Onogi
and Akiyoshi Kawaoka
Research and development department, Agri-Biotechnology Research Laboratory,
Nippon Paper Industries Co., Ltd.

  Amapa Florestal e Celulose S.A. (AMCEL), with the total area of 300,000 ha in Amapa state located in northern Brazil, operates eucalyptus plantation and wood chip production. AMCEL has outstanding features of flat and large bundled land, the distance to the chip mill and the port, abundant precipitation and warm climate. However, AMCEL could not make the most of these features because the growth of trees of plantation was not very good. After the purchase of AMCEL in December 2006, AMCEL has started the original selection and breeding program. As a result of continuous practice of the program, the growth of the trees was greatly improved.
  The author stationed in AMCEL from 2009 to 2012 as a supervisor of Research Department and had been working on the improvement of tree growth and property through tree breeding program. In this report the business summary of AMCEL will be presented. Then the relationship between tree growth and the tree property of clonal forest, such as KP yield and wood basic density measured by rapid analyses method, will be discussed.


Optimization of the Condition in the Press Section

Ryosuke Kobayashi
Chemicals Development Team, Maintech Paper Tech Co., Ltd.

  In recent years, neutral papermaking, high-ash content of the printing paper and weight reduction in paperboard is in progress. At the same time, increase in the blending ratio of waste paper, closed water system, paper recycling rate, attributable to these trouble of deposit on the machine that has increased in the wet section, to pursue quality improvement and production efficiency and stability operations, has become a major issue.
  Maintech has developed new "On-press®" and "Pitch guard®" series.
  Release agent "On-press®" greatly improve the sheet release performance from press roll, especially Center Press Roll. Cleaning and prevention agent "Pitch guard®" significantly reduce stickies and other deposition in the wet section.
  This report describes the concept and mechanism about "On-press®" and "Pitch guard®" series, and introduces actual case studies about pitch prevention, sheet, release improvement.


The Present Condition of the “AOKI CLEANER”in the Paper Manufacture Industry
-Blade Type Canvas Cleaner-

Narihiro Ohtaka
Aoki Machinery Co., Ltd.

  In recent years the operation troubles of paper machine and its quality problems occur more frequently due to foreign materials including sticky pitch coming from increasing recycled paper usage. The sticky materials and pitch on canvas causes paper break at dryer, faulty spot, frequent splicing at winder, which decrease productivity.
Screening, pitch control chemical, high pressure water has been used to improve these situations, but these measures cannot solve the problems completely.
  We, AOKI Machinery, has been developed “AOKI CLEANER”, an epoch-making blade type canvas cleaner. Let us introduce its mechanism and some operation facts.


Introduction of Raumaster Finishing System

Masashi Shibaki
Itochu Machine-Tehnos Corporation

  Raumaster Paper was founded in 1984 in finland and one of the best company in paper and pulp finishing system. It has been over 20 and 30 years since current finishing system were started up in many paper and pulp mills in Japan and they are now facing the deterioration by long term use. Our company started the business with Raumaster Paper in 2012 in response to the market needs and would like to introduce Raumaster finishing system in this paper.


The Countermeasures for Reduction of the Fuel Consumption in Lime Kiln

Hideto Suzuki
Consulting Department, Taiheiyo Engineering Corporation

  Over the past years, Taiheiyo Engineering Corporation (TEC), Tokyo has conducted numerous investigations in cement plants around the world for various clients who have process and operation problems or who are planning for innovations.
  TEC have developed successful techniques to diagnose the existing cement plants and to overcome the existing process/operational problems and to reduce the fuel consumption and thus assuring stable kiln operation.
  In the paper industry in Japan is implementing various measures to reduce the fuel consumption.
Although a certain improvement has been obtained, but not to the extent of large reduction of fuel consumption is obtained, so far.
  Hence based on energy-saving technology adopted in cement plants, TEC has conducted extensive study in Lime Kiln operation achieved following successful results towards reduction of the fuel consumption.
1) Diagnosis of Lime Kiln : TEC have conducted a diagnosis study on existing Lime Kiln towards the existing process/operational problems and to found optimal countermeasures for reduction of the fuel consumption.
2) Replacement of existing Kiln Burner: By replacing the existing Kiln Burner with Taiheiyo's TMP Burner (Taiheiyo Multi-purpose Burner), TEC achieved improved burnability efficiency and reduction in the amount of primary air.
3) Adjustment of Lime Cooler: For the improvement of heat recovery efficiency of existing Lime Kiln Cooler, Grate Speed Control and Airflow Control was adopted to Lime Kiln Cooler, for better cooling efficiency.
4) Adjustment of Kiln Operation: TEC has reduced the amount of water at the Lime Kiln Inlet Housing, thus optimizing the O2 concentration control, and the raw meal filling ratio in the Lime Kiln.
  As a result of adopting above mentioned countermeasures, TEC achieved a 13% to 15% reduction of the fuel consumption.


High-Efficiency and Power-Saving Closed Condensate Recovery System
-High Efficiency Control Method of Once-Through Boilers in Multiple Installation
and Closed Condensate Recovery System for Small Once-Through Boilers-

Masahiko Murakami and Tomohiro Okubo
Miura Co., Ltd.

  MIURA as a leading manufacturer of small once-through boilers has adopted “Plant infrastructure total solution” as a slogan and is promoting various eco-friendly proposal activities through water treatment devices for industrial water and compressors using in-plant process steam, and so on. This paper explains following technologies;
ESmall once-through boilers with very high efficiency and quick response
EClosed condensate recovery system with high-efficiency and power-saving


Improvement of Existing Wastewater Treatment Facilities with Microbial Products and Chemicals to Control Offensive Odor

Kenji Hayashi
Mushugen Industries Co., Ltd.

  Mushugen Industries Co., Ltd. is a manufacturer of microbial products and deodorants for waste water treatment. In the field of sewage treatment and disposal of human waste, we have different perspectives from other plant manufacturers. Using those perspectives, we have been working on the trouble of existing waste water treatment facilities and improving its function for long time. The microbial products and deodorants of technology cultivated in it, and the maintenance management know-how using these products.
  Based on those, we have promoted the application in the field of pulp and paper waste water treatment from six years ago. In terms of functional improvement of the existing waste water treatment facilities, the needs of the current situation is met which is obtained certain results. In conjunction with knowledge about the characteristics and problems of the pulp and paper waste  water treatment obtained so far, to introduce a summary of them.


SUCCESS FORMER Started-Up for 2Ply Lightweight Linerboard

Chen Jun and Masahito Mukai
Paper Machinery Engineering Dept., Kobayashi Engineering Works, Ltd.

  Although the growth rate has become slow down recently, Chinese paper industry still keeps higher level of its expansion. Our company continues supplying formers from the beginning of 1980, and we take pride in having supported the growth of industry. The occurrence which has deeply recognized us, is a remarkable progress of Lee & Man Paper Manufacturing Ltd. which acquired the 2nd place of paper and paperboard production in China. It was only a 100,000-ton /year with two paper machines until 1999, however, it has become the production capacity of 30 times or more in about ten years. The opportunity of employing the first Success Former for PM3 in 2000, may have become a landmark for the subsequent progress of Lee & Man Paper. Success Former features both high quality and productivity with excellent energy saving former operation. The results are four continuous repeat orders for PM5, PM10, PM11 and PM13, respectively. The forming sections of all above machine consist of three-ply Success Formers with sheet transfer felt systems.
  In order to meet an industrial demand for producing light-weight linerboard, two-ply on top former with fourdrinier as a base-ply, was installed as PM16 in 2011. The top former is a Success Former which has received high reputation from the customer. This paper makes the introduction of the forming section of PM16, and reports the conditions of its successful start-up.


The New Internal Sizing Agent for Paperboard as an Alternative to Rosin Materials

Junichi Hogouri
Research and Development Department, Paper Chemicals Division,
Arakawa Chemical Industries, Ltd.

  In recent paperboard manufacturing, recycled paper is used as the main raw material. The recycled material involves deteriorated fiber and much filler such as calcium carbonate (CaCO3). Higher CaCO3 content in pulp slurry will increase pH, therefore acid additives such as alum will be neutralized and easily lose their ability. To make matter worse, Paper manufacturers will tend to avoid the addition of acidic  compounds. Higher pH condition and lower addition level of Alum causes lower sizing degree, in particular the case of rosin size.
  In neutral-alkaline papermaking condition, AKD or ASA is commonly used instead of rosin-Alum system. However, in the case of paperboard, slow speed in inducing sizing of AKD, paper slipperiness trouble, and deposit or poor machine runability trouble on ASA will be recognized. In this report, a new type sizing agent will be introduced. It must cover wide range pH of wet-end condition and can be possible to replace rosin-Alum system.


On-line Drainage Meter in the Forming Section  -Introduction of “FiberScanFIX”-

Masaru Futaba
Nomura Shoji Co., Ltd.

  Cristini in Italy released a portable drainage meter in the Forming Section with microwave technology in 2004 and it has become a standard tool for diagnosing the Forming Section because of its accuracy and wide range of measurement values. FiberScanFIX was developed as on-line system based on portable FiberScan.
  In this article, the benefits of measuring with FiberScan FIX on-line drainage meter in the Forming section are introduced. Diagnosis of the Forming Section with FiberScan FIX enables the process optimization and saving costs.


Possibilities of Optical Sensors  -Consideration on the Functions and Applications-

Keijiro Suzuki, Takuya Maekawa, Ryohei Watanabe and Yoshio Ishitsu
Spectris Co, Ltd.

  BTG has been engaging to develop a number of solutions in Pulp and Paper process with the epoch-making brand-new technologies for more than 80 years. By the Tohoku earthquake and Tsunami, the Japanese Pulp and Paper industries faced the big difficulties and this forced us to find the new way of business. In this paper, we show the possibility of raising the productivity and profitability with BTG optical sensors.


Development of High Quality Porous Fillers (PartⅠ)
-Study of the Effect of Particle Properties of Porous Fillers on Bulkiness and Opacity of Paper-

Manabu Yamamoto
Advanced Technology Laboratory, Oji Holdings Corporation
Hiroyuki Wakasa
Core Technology Laboratory, Oji Holdings Corporation
Hitoshi Okada
Japan Pulp & Paper Research Institute INC.

  Due to their low specific gravity, porous fillers, including precipitating silica, have, in recent years, been increasingly used as additives (fillers) for the purpose of increasing paper bulkiness (reducing weight). The use of porous fillers has advantages such as continued utilization of existing equipment without the occurrence of discoloration problems inherent with mechanical pulps. However, problems such as degraded paper strength still remain to be solved. In view of this, we have conducted a study in an attempt to develop a high quality porous filler with superior bulkiness performance, excellent opacity and minimal degradation in paper strength.
  This report reveals that a porous filler with minimized degradation in paper strength, high bulkiness performance, and excellent opacity has been obtained by optimizing the primary particle diameter and the secondary coagulation particle diameter.