|2010 August JAPAN TAPPI JOURNAL
Vol.64, No.8 Abstracts
The Approach to Improve the Functions of SAQ® as a Cooking Additive
Kawasaki Kasei Chemicals Ltd.
It is very important subject for pulp mills to produce pulp effectively from a viewpoint of effective use of fossil fuel and forest resources. In order to improve both delignification rate and pulp yields, anthraquinone compounds have been used as cooking additives. SAQ® has been used as a cooking additive in many KP mills. Kawasaki-Kasei has been putting energies into not only the technical service to pulp mills but also the studies of SAQ®. This report introduces three topics as our actions; (i) the development of SAQ® addition to impregnate effectively into wood chips, (ii) the studies of anthraquinone compounds which effect improves more significantly than SAQ®, and (iii) the suggestions of the eco-friendly cooking method with SAQ®.
Chlorate Based Eka Purate® Technology Used for Small-scale Generation of Chlorine Dioxide for Microbiological Control in Papermaking
Ong Hui Lam, Yap Ken Fui, Gunnar Goransson, Yoshikazu Sonehara and Shigeharu Harakawa
Eka Chemicals, Asia Pacific
Good control of microbiological activity in process waters is crucial for high productivity and quality in pulp and paper production. Over the last decade oxidizing biocides have become the preferred solution for microbe and slime control in papermaking process waters. A key benefit of the change from organic biocides to oxidizing biocides has been improved cost performance.
Available oxidizing biocides include combined halogen oxidants, sodium hypochlorite, paracetic acid and chlorine dioxide. This report focuses on Eka Purate® a chlorate based technology for small scale generation of chlorine dioxide used as a biocide in papermaking industries in fresh water and process water applications.
The Application of Latest Bladed Style Top Former Producing Board Grades
-Pulse Frequency Top FormerTM-
Yutaka Fujishima and Masahito Mukai
Paper Machinery Engineering Dept., Kobayashi Engineering Works, Ltd.
The rebuild of a fourdrinier with a vintage blade style top forming configuration is examined for papermachines producing board grades. Limitations of the pre-rebuild design are discussed from a fundamental standpoint. The fluid mechanics of the vintage and rebuilt twin wire forming sections are examined. Design challenges and solutions to mitigate the limitations of the pre-rebuild former are discussed.
The rebuild is engineered for the specific furnish and application based upon end product needs. A majority of the existing forming section remains intact minimizing installed cost and papermachine down time for installation.
Three rebuilds are reported on, two on linerboard grades and one on a woodfree uncoated grade. Performance is characterized before and after each rebuild with regards to operating capacity and a variety of sheet properties, depending on the grade of paper being produced. Significant improvements in capacity, formation, smoothness, and mechanical strength properties were realized after the rebuilds.
This report is prepared focusing on the linerboard rebuild at this time.
Introduction of Electronic Nip Impression Measurement System “Sigma-Nip”
Nomura Shoji Co., Ltd.
A scheduled paper machine shutdown presents a valuable opportunity for mill engineers representatives to diagnose, correct, and optimize roll and nip conditions. Electronic nip impression measurement systems enable on-the-spot evaluation of nip profiles and have become an increasingly valuable tool for diagnosing problems and improving profiles, paper quality, and machine operation.
Sigma-Nip, an electronic nip analysis system, calculates and records nip width at multiple points across rollers face length in real-time with unprecedented speed, accuracy and repeatability. Sigma-Nip presents a revolution in quality control. Now, for the first time ever the technician is able to accurately, efficiently and economically measure roller profiles and alignment condition. Sigma-Nip consists of a series of thin-film resistive ink pressure transducers on a carrier sheet. As this carrier sheet is loaded in between rollers the Windows based software assimilates the readings into easily interpretable graphical images-all in real-time.
Use of Superlow Viscosity Modified Starch for Coating
Research and Development Laboratory, Oji Cornstarch Co., Ltd.
Recently development of printing technology requires high quality printing paper but also low-cost paper, so that paper mills have improved productivity and cost of color materials. They require the material that is able to make high solid and high speed coating color.
We have developed superlow viscosity modified starch, itfs named gHSS COATh. Usually if it uses a low viscosity starch for coating color, surface strength of its coated paper is very week. But using of HSS COAT is able to maintain the surface strength of coated paper. Besides it can be prepared with higher solid coating color, so that coated paper quality, including such as gloss etc., is improved, and itfs probable to reduce latex.
We would like to recommend using of HSS COAT for coating color.
A New Type of PAM Based Micro-particle Polymer Dispersion
-Performance of POLYTENTION-
Research and Development Department, Paper Chemicals Division, Arakawa Chemical Industries, Ltd.
From an environmental protection point of view, a necessity of paper recycling has to be highly encouraged by paper industry. Recycling rate of used paper has been increasing, and fibre 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, various wet-end additives or internal wet-end agents cannot show desirable performance.
We have already introduced a new PAM based type agent, POLYTENTION (“PT”), in recent report. “PT” shows high coagulation force and it can make fibre one-pass retention higher even under severe condition. “PT” also gives favorable paper strength to dried sheet, as compared to the sheet using only retention aids.
“PT” reduces total wet-end additives, and it is expected controlling the paper making conditions.
This report explains floc formation and sheet formation with “PT” and introduces the effect of “PT” under various paper making conditions.
Insect Control and Energy Saving by Light Effects
It has been the most common understanding that the purpose of utilizing light is to secure a certain level of illuminance. However, recently, the aim of reducing effects on the environment has increased demand for other manners of utilizing light. From an insect control standpoint, now that chemical treatment is insufficient and needs for structural insect control is growing, insect control by light is becoming increasingly important.
We will give a presentation about the following topics.
1) Energy saving by utilizing light
2) Correlation between insects and light in facilities
3) Insect control by thermographic inspection
4) Adiabatic effect in facilities by IR (infrared ray) control
In view of energy saving, the combination of UV control and IR control which are seemingly contradictory will be essential for facility management in future.
Benefits of Gas Seal Installation in Blowers for Containment of Noxious Odors
-How to Contain Noxious Odors-
Gas Seal Engineering Dept., John Crane Japan, Inc.
Noxious odor is one of the inseparable issues for paper mill plants. There is odor generation not only during the manufacturing process of pulp, but also during the concentrating process of black liquor and the bleaching process of recycled pulp.
How to prevent noxious odors from leaking out to the atmosphere is a big issue. Therefore, we can assume that many factories are using their energy to prevent odor leakage from the blowerfs shaft seal. John Crane has found out that the non-contacting gas seal is more effective than the conventional contacting mechanical seal when it comes to reducing the leakage of noxious odors. Non-contacting gas seals are also effective in reducing power consumption and extending operation longevity. John Cranefs non-contacting gas seals, especially the Type 2800E, have been installed into paper mill plants and have succeeded in reducing odor leakage to ZERO. We at John Crane assure you that our gas seals will help to prevent gas leakage, and we hope that you will use our gas seals in your blowers.
Mettler Toledofs Digital ISM and Cableless Solution for Pulp & Paper Industry
Process Analytics Division, Mettler Toledo K.K.
In 2007, Mettler Toledo introduced the new digital technology for on-line monitoring sensors, called ISM (Intelligent sensor management). ISM has a quite new concept for the future and for today. ISM gives every industry a lot of benefits by making all the handling operations much simpler, more error-free and more efficient.
In addition to this, Cableless solution gW100 cableless kith is now available for easy installation and connection.
The W100 provides the advantages of cableless installations. In combination with the ISM technology, this kit provides flexibility for many applications in Pulp & Paper industry.
Advanced Management Method of Press Section
Control System Eng. Dept., Voith IHI Paper Technology Co., Ltd.
The FeltView press felt optimization system provides scanning measurement of water weight, permeability and surface temperature continuously with on line for up to four press felts. These measuring data are changed to visual graphical figures and some arrangement pictures are shown in the monitor screen. In particular, color maps converted form raw signals produce the optimization operation with detailed analysis of water weight, permeability and temperature over a felt life.
The integration of these data enable more comprehensive data analysis of process interactions. Moreover, these data are saved in the OnView system for up to one year for a long term analysis and historical comparisons of felt performance.
“FeltView” system is optimal tool for press operators to back up to expected results with effective analysis of three data bases.
Estimate of the Fixation and Reduction Amount of CO2 by Carbonization Treatment of Paper Sludge
-The Possibility of CCS Technology of Carbonization Treatment-
Faculty of Risk and Crisis Management, Chiba Institute of Science
Fuji Industrial Research Institute of Shizuoka Prefecture
Gakunan Daiich Cooperation of Paper Manufacturing Association
Naoto Matsue and Teruo Henmi
Department of Agriculture, Ehime Univ.
In this study, we proposed a new CO2 fixation and reduction method for the paper industry using carbonized paper sludge (CPS). The carbonaceous material in CPS is derived from CO2 in the air. We considered the CO2 fixation and reduction method using carbonization treatment which stably preserves carbonaceous material in PS. And this CO2 fixation and reduction method is also considered to be a low cost and realizable carbon capture and storage (CCS) technology in the near feature.
We collected the CPS from PS cooperative treatment factory in Fuji city of Shizuoka pref., and analyzed by XRD, XRF and TG/DTA. The carbonaceous material in CPS was classified by chemical fractionation treatment using soil science method. Especially, the carbon content ratios of CPS were analyzed by CHNS/O Analyzer. The classifying results show that the almost all the carbonaceous material in CPS could be considered ghumic materialh that were chemically stable. From this analyzing results, the estimated total amount of CO2 correspond to carbonaceous material in CPS was equal to 19.6t-CO2 form the daily carbonization treatment process. In this process, the CO2 released from cellulose can be considered "carbon neutral", however the CO2 discharged from calcite should be calculated at 1.1t-CO2. At the same time, carbonization treatment needed 5,500m3 of LNG for combustion improver and 1,016kWh of electricity for exhausting gas treatment. From these processes, the 12.5t-CO2 emission was estimated. The total amount of CO2 storage in the daily carbonization treatment was calculated at 6.0t-CO2, and it was equal to 133.1kg-CO2 in 1t CPS. Applying the carbonization process to PS treatment enables to reduce 214.1 kg-CO2 in 1t dried PS (DPS) as compared to applying normal incineration process. On the other hand when PS is substituted instead of crude oil for fuel in boilers, the reduction of CO2 is estimated at 358.3kg- CO2/t (DPS)
These results show that the carbonization and thermal utilization processes to PS can be considered as a CO2 reduction method. And only carbonization process can be considered as CO2 fixation process in limited usage by returning it to the soil as soil conditioner.
Keywords: paper sludge (PS), carbonization treatment, CO2, CCS, soil
Effects of TEMPO-mediated Oxidation of Pulp Fibers on Filtration and Ion-exchange Properties of Handsheets
Technical Division, Yamashin Filter Corp.
Tsuguyuki Saito, Toshiharu Enomae and Akira Isogai
Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo
First, highly fibrillated TEMPO-oxidized hardwood bleached kraft pulp (FTO-HBKP) was prepared by disintegration of TEMPO-oxidized HBKP (carboxylate content of ca. 1.5 mmol/g) in de-ionized water. The translucent FTO-HBKP dispersion thus obtained was added to the original unbeaten HBKP suspension in tap water to prepare HBKP/FTO-HBKP handsheets. The addition levels of FTO-HBKP to HBKP were set to be 0-30% based on dry weight of HBKP. The HBKP/FTO-HBKP sheet density was linearly increased as the addition level of FTO-HBKP was increased from 10 to 30%, and correspondingly the peak position of micro-pore size of the sheets was shifted to smaller range direction. Although air permeability of the sheets was decreased with the addition of FTO-HBKP, the sheets prepared even with 30% FTO-HBKP had still sufficient air permeability for filter materials. Filtration efficiency of nano/micron-size particles for the sheets in air was clearly improved by the FTO-HBKP addition, showing that the HBKP/FTO-HBKP sheets have potential applications as high-performance air-filters. Second, a TEMPO-oxidized softwood bleached kraft pulp (TO-SBKP: carboxylate content of ca. 1.2 mmol/g) was prepared from unbeaten SBKP, and handsheets were prepared thereof using either de-ionized water or tap water with 0-30% (based on dry weight of TO-SBKP) aluminum sulfate. Ion-exchange behavior of sodium carboxylate groups in TO-SBKP was then evaluated. When the TO-SBKP sheets were prepared in de-ionized water with aluminum sulfate, Na content originally present in the TO-SBKP sheet was decreased with the increase in the aluminum sulfate addition by ion-exchange. When tap water was used, Ca and Mg ions present in the tap water were first introduced to the TO-SBKP sheets by ion-exchange. Al content was increased with the aluminum sulfate addition by ion-exchange. Once-dried TO-SBHKP sheets also had similar ion-exchange capability from Na to Al, when the sheets were soaked in tap water or de-ionized water with aluminum sulfate.
Keywords: TEMPO-mediated oxidation, oxidized pulp, papermaking, disintegration, nano-fiber, air-permeability, ion-exchange, filtration efficiency