TAPPI JOURNAL October 2008
Vol.62 No.10 Abstracts
Introduction of IntensaPulper
Stock Preparation Dept., Voith IHI Paper Technology Co., Ltd.
In the secondary fiber system, improvement of the runnability of the pulper respects to that of the efficiency of the fiber system itself.
We, Voith IHI Paper Technology (VIPT), offer not only the equipment but also total system of the stock preparation which is combined with worldwide leading technology of Voith Paper, Germany, and more than 40 year's experience and know how in Japan of Ishikawajima Industrial Machinery (IIM). As a result of such synergy effect of the leading technology, the joint venture, VIPT, has developed the innovative low consistency pulper which is named "IntensaPulper".
The "IntensaPulper" and the latest secondary fiber system applied with the IntensaPulper are introduced herewith.
Recent Experience and Tendency of Refiner and Refiner Bar
-Introduction of Saving Energy for Refiner and Low Intensity Bar-
Aikawa Iron Works Co., Ltd.
Recently saving energy is an important issue in the pulp and paper industry in Japan because of increasing oil prices. Besides the price of waste paper which is used in our country is increasing, so we have to use low quality material more than before. We have to use low quality and weak strength of material so that we should well manage them. Therefore we would introduce a result of energy saving by our new refining machine and the new suitable plates for the low intensity refining.
Key Parameters for Trouble-Free ASA Operation and Recent Trends
Eka Chemicals K.K.
Alkenyl succinic anhydride (ASA) is of increased interest to the paper industry, mainly because of its potential to decrease the application costs. This paper reviews the most relevant parameters for trouble free ASA operations, the ASA manufacturing process, the emulsification process and the application of ASA in the wet end. Since those parameters are today better understood and more optimized than in the past, trouble-free ASA sizing is achieved in an increasing number of paper mills. Recent trends in the ASA technology indicate further developments towards new stabilizers and simpler emulsification systems targeting an even broader field of applications in the future.
Multilayer Curtain Coating and New Type of Calendering
Hidehiko Yamazaki and Akihito Nagano
Metso Paper Japan Co., Ltd.
The authors introduce newly developed coating and calendaring technologies in our presentation.
Multilayer coating gives a broader coating application window compared to traditional coating methods. It can apply both high coat weights and multiple layers in a single stage. In this way it gives better economy by enabling thicker, less expensive, coating layers for certain paper/board properties (bulk, opacity, brightness...) and thinner, more expensive, coating layers for other properties (gloss, barrier...).
Metal belt calendering gives better surface topography and printability compared to traditional, shorter dwell, calendering methods. The other way round is that it gives the targeted surface properties at higher bulk and stiffness thus saving in the material costs of the paper/board manufacturing.
The preliminary research results of combining these new surface treatment processes are promising. It seems to be possible to compensate the less smooth surface produced by contour type multilayer coating by advanced, long dwell, metal belt calendering.
Release Agent for Press Rolls
Sales Engineering Div.，Maintech Co., Ltd.
Deposition of pitch or fine fiber on the press rolls causes defects in the sheet, sheet breaks and fiber rising. Especially for high speed PMs, sheet release from the rolls is not only limiting their speed but also giving strong impact to paper quality.
Cationic polymer has been generally used to keep the roll surface clean, however, those program are not able to reduce draw and fiber rising effectively.
Our technology, a continuous application of chemical additives (Polymer based product, On PressTM) directly onto press rolls treats surface and establishes a protective coating that prevents deposit buildup.
In addition to preventing deposition and linting on the press rolls, this new technology enables mills to increase PM speed and/or improve paper quality.
In this report, basic mechanism of the roll release is explained and case histories to newsprint and coated paper M/C are presented.
Keyword: press roll, web release, open draw, tension, pitch, stickies, deposit, polymer, sheet break
The Coating, which Have Stain Resistance and Easy Separating Properties
Keiji Nakai, Masaki Tsuji, Teruyuki Kitagawa and Junji Taguchi
Nomura Plating Co., Ltd.
Our company has offered various wear (for the paper manufacture industries) parts and mold-release characteristic parts until now. However, it is not that all are also satisfied and nothing, there was a case where meeting the request could not be finished. So, in this announcement, our company introduces the various plating which exceed the plating which can be offered now. Although all needs cannot be grasped since this plating is a utilization stage, it is the plating which is advancing by our company towards utilization.
Pest Control Program for Quality Assurance
Research & Development, Earth Environmental Service Co., Ltd.
The various measures have been taken since before in a factory as the prevention of the breeding and extermination of the insects. The pest control program for quality assurance is needed for these factories. However, there are few cases that developed the program of effective prevention of the breeding and extermination. The factory where has the program that be able to explain to the outside a company is few.
Today, we explain about the point of effective pest control program for quality assurance.
High Performance QCS Recognized by New Designed PaperIQ Plus
Application Engineering, Metso Automation K.K.
PaperIQ Plus developed by Metso is built upon the proven and successful architecture of the first PaperIQ systems. Modular and intelligent IQSensors with their extensive self diagnostic provide the low-noise sheet quality measurements required for stable controls. The performance of IQScanner has been upgraded by increasing its capability to scan at much higher speeds. Horizontal stiffness, alignment and vibration resistance have been improved. New scanning sensors have been added to measure sheet properties based on the optical technology. One of the newest sensors, IQCaliper-L, measures caliper without contacting to the sheet.
Non scanning, full sheet measurements have been developed as well. IQInsight measures high frequency MD and CD snapshots of the sheet moisture immediately after it is formed and pressed, helping with wet end and press section optimization programs and allowing better control from that location.
This paper presents the Metso new developed QCS with new scanner and sensors.
Introduction of Paprican's Optical Calibration Program
-Special Report: Paper Optical Properties, Best Measurement and Influence from Materials and Process-
Lorentzen & Wettre K.K.
Optical properties are the most readily-assessed quality attributes of pulp and paper products, which have directly impact on price performance. Visual assessment and ranking are highly subjective and influenced by conditions, so that several evaluation methods were developed. But, insufficient knowledge with the result difference between methods caused disagreement and confusion in the marketplace.
So, knowing a basic knowledge of optical properties and best measurement to meet customer's specification is essential to paper makers. The calibration program is also important part in measurement to sustain reliable results, which productive calibration program is provided by the Paprican, Pulp and Paper Research Institute of Canada.
This report shows highlights of a presentation on optical properties made by Paprican at the L&W seminar in May. It illustrates the basic concepts of optical measurements and factors influencing optical properties, as well as the importance of regular calibration to ensure reliable results.
Fully Sprit Seal for Poor Accurate Rotations in Agitators Services
Mechanical Seal Engineering Dept., John Crane Japan, Inc.
Conversion of gland packing to mechanical seal in pulp and paper mills is underway but it is only limited to the major machines like pumps for cooking and chemical or refiners. Gland packing is still favoured in raw material tanks or horizontal agitators for chest.
This is because the horizontal agitators often generate shaft runout or vibration because of its long distance with external bearing that maintains shaft, or change of load to impeller due to liquid decrease, etc., and it is thought that mechanical seals cannot accommodate.
However, there is a mechanical seal that can absorb such shaft runout or vibration by using rubber bellows. Furthermore, its fully split design can reduce cost and time of the maintenance.
We would like to introduce here the fully split mechanical seal which can accommodate the shaft runout of horizontal agitators with actual experiences.
For Sound or Noise in Industrial World Part III
-It Thinks about the Noise as Part of T.F.O. from SKF-
Condition Monitoring Service Division, SKF Japan
"For sound or noise in industrial world" is the third in this time. I want to see by thinking mainly about the sound that the person doesn't hear of easily this time. In a sense, the noise that the machine is generated seems to be "Scream" of the machine. The state of the rotation seems to have emitted various noise as bad one. I think that the sound of person's hearing is a sound pressure (roundness), the frequency (tone), and it exists variously. I want to explain these while putting the example.
Introduction of Fan: Performance and Design Technique
Hidemitsu Nagai and Yoshimasa Watanabe
Engineering Div., TERAL INC.
It is interested in the world scale as
the Kyoto Protocol is adopted by COP3, and the reduction
of the CO2 gas is requested. In the blower industry,
a further energy saving becomes an urgent problem.
In our company, a big model of the amount of power
consumption is advancing restyling. This time, "CTF3-OB
turbofan" (high-pressure type) and "CMF3-OB mild fan"
(Middle-pressure type) blower series were turned on
to the market, it introduces it here. The new model
machine is used as a charging air fan of the paper
mill equipment etc.
Report on PaperCon '08
Nippon Paper Industries Co., Ltd., Product Development, Research Laboratory
Oji Paper Co., Ltd., Pulp & Paper Research Laboratory
PaperCon '08 was held in Sheraton Dallas, Texas, U.S.A. from May 4 to 7. There were 77 sessions and 181 presentations in this conference. This international conference attracted over 1000 participants from around the world. We had an opportunity to join the conference and made a summary of interesting 16 presentations in this report.
Behaviors of Carbohydrate Yield and Hexenuronic Acid Formation during Softwoods Alkaline Cooking
Shiho Takahashi, Guangfan Jin, Akiko Nakagawa-izumi and Hiroshi Ohi
Graduate School of Life and Environmental Sciences, University of Tsukuba
Graduate School of Agricultural and Life Sciences, The University of Tokyo
Hachinohe Mill, Mitsubishi Paper Mills, Ltd.
It is required to use more Japanese softwoods, for example, Larix leptolepis (Japanese larch), Pinus densiflora (Japanese red pine), and Cryptomeria japonica (Japanese cedar) for the effective production of pulp and bio-energy. The pulp yield in cooking stage is one of the most important factors at a pulp mill. However, it is difficult to know the yield due to a continuous operation of the mill. In this paper, we proposed on a method for estimating Japanese softwood pulp yields at a continuously operated kraft pulp mill. The behaviors of xylan, mannan, carbohydrate and hexenuronic acid (HexA) contents in various alkaline cooking of Japanese larch were studied. A Part of dissolved xylan was re-adsorbed by wood fibers in the cooking, and the result indicates that the pulp yield can not be estimated from ratios of xylose to glucose (X/G ratios) liberated by acid hydrolysis from the pulps. Therefore, we made some equations which could simulate the behaviors of delignification, carbohydrates, ratio of mannose to glucose (M/G ratios), and HexA in the cooking from the results of kraft, kraft-AQ and PS-AQ cooks. From these equations, we clarified the relationship between pulp yields and the M/G ratios, and then, it was shown that a good correlation existed between pulp yields and M/G ratios at kappa number 25. The softwoods pulp yields with kappa number 25 at the mill using the Japanese red pine and Japanese cedar mixed wood chips were estimated by the proposed method. The M/G ratios of mill pulps from kraft-AQ and kraft cooks were 0.0812 and 0.0704, respectively, and the result means that the pulp yield by kraft-AQ cook was 1.3% higher than that by kraft method. HexA contents of PS-AQ and kraft-AQ pulps with kappa number 25 at a given H-factor from Japanese softwoods were higher than that of kraft pulp. At the mill trial, the HexA content of kraft-AQ pulp was 7 mmol/kg higher than that of kraft pulp.
Keywords: kraft, anthraquinone, polysulfide, pulp yield, carbohydrate, hexenuronic acid