2006年8月 紙パ技協誌

[プリント用ページ]
Successful Press Section Management by Means of EnviroScan™ and FeltView™ Measurement

Hideomi Uchikawa
Voith Paper Automation Japan Ltd.
Reinhard Mullar
Voith Paper Automation GmbH & Co. KG

 Some years ago a one-nip press concept appeared to be a vision that was out of reach. As a press concept like this provides obvious benefits to papermakers. Both woodfree and woodcontaining papers have their own individual dewatering behavior during pressing. Finally, it turned out that woodfree paper grades reach a sufficient dryness level after one nip only.
 This paper describes the press configuration, the successful press section management by means of EnviroScan™ and FeltView™, and the layout data of the commercial reference machine. EnviroScan™ is a single beam compact scanner with moisture and sheet temperature measurements embedded inside the scanner frame as special designed. The scanner and the embedded both moisture and sheet temperature measurement are fully protected from the severe environment. FeltView™ is a press felt optimization system provides scanning measurement of water weight, permeability and surface temperature for up to four press felts. Both EnviroScan™ and FeltView™ should be standard for all Single NipcoFlex Press.


The Field Performance of MJ Former for Packaging Grade

Akihito Nagano and Kazuhiko Masuda
Mitsubishi Heavy Industries, LTD.

 The features and performance of "MJ Former", high speed roll former for packaging grade has been presented at 2004 Japan Tappi. The first installation has successfully started up in Germany one week ahead of schedule. This paper machine has already reached design speed on brown grade. Paper qualities are excellent and achieved the target.
 This paper presents the project outline and performance of paper machine high lighting "MJ Former".


Operating Experience of Headbox with Dilution Control System

Satoru Nakazato
Saga Mill, Oji Paperboard Co., Ltd.

 In 1985, a 5-layer Highspeed Ultra Former was introduced to PM5 in Saga Mill of Oji Paperboard Co., Ltd. Along with the speed-up of the machine, the flow rate through the headboxes increased and exceeded the design rate, resulting in bad BD profiles and exposure of the ridge problems (oil drum-like wrinkles). To solve them, the headboxes have been replaced systematically since 1997 and a micro-rod BD profiling system was brought in 2002. Then, we installed a Dilution Control System as a final stage.
 The installation of the Dilution Control System has provided the improvement of the BD and caliper profile by up to 48% and 25%, respectively. In addition, the down-time for grade change and start-up has been cut by 2.4 minute and 3.8 minute on an average, respectively.
 The outline, the operating experience, and the advantage of the headboxes with the Dilution Control System introduced to the PM5 are summarized in this report.


Development and Operational Suitability Test-Result of High Efficiency Washer 「Zekoo」

Saeko Akiyama, Takefumi Ide and Kiyoshi Yoda
TAIZEN Co., LTD.

 In the Paper Industry, the need for Waste Papers has been increasing more and more. In the process technology for Waste Papers, the pulping process by the kneading method, which is our specialty, has been main current and so the quality of Waste-Pulps is very improved now.
 Then we have aimed at a High concentration Washer to gain the more high quality of Waste Pulps. After many times of the trial and error, we have finally developed our vertical washer with separator, which is "Zekoo"
 This "Zekoo" is capable of high−grade washing for Waste Pulps by our original mechanisms, which are the centrifugal dehydration, the kneading action , the turbulence and the efficient replacement of washing water by fresh water. And the vertical structure of Zekoo enables it to save the installation place and fresh water usages. And this "Zekoo" is designed to be applicable to wide concentrations of pulps and to be simple in the operations and the maintenances.
 In the actual running of Zekoo, some potentials like as high grade rejection capacity of carbons and ashes and recovery capacity of fibers are demonstrated.
 Now we present this epoch-making washer "Zekoo" to the Paper Industry, in which the need for the Waste Papers is increasing more and more in the future.


Equipment and Methods for Reliability-based Maintenance Strategies in the Paper Industry

Oliver Massa
F'IS Paper & Steel, FAG Industrial Service GmbH

 Aimed availability of more than 95% in the paper industry does not allows any unscheduled shutdowns. This necessitates the employment of suitable inspections, measurements and monitoring in order to be able to reliably assess the condition of the equipment and detect damage to machinery early on. With online, a minimal damage or condition changes can be detected at a very early stage in comparison to offline.
 Online condition monitoring allows a fast reaction time to plan the maintenance activities and guarantee highest reliability, but only with a consequent root cause analysis and counter measure, downtime can be reduced substantially.


Total Wet-end System with Reduced Alum Dosage for Linerboard

Takao Sezaki and Yasuhide Yoshimoto
Paper Chemicals Division, Harima Chemicals, Inc.

 In papermaking industry, operating conditions are changing rapidly in order to cope with a rise in worldwide environmental awareness and unavoidable rationalization aiming to improve the profitability. In linerboard, the amount of calcium carbonate that contaminates the wet-end process tends to increase due to an increase in the recycling ratio of magazine. Consequently, such contamination could lead to the problem of frequent trouble by heavy gypsum scale and reduction in performance of wet-end additives because of the raised conductivity.
 Under these situations, reduction of alum is expected to bring a lot of merits in linerboard production. On the other hand, some demerits would also arise from it. The application of "Total Wet-end System" is able to not only get rid of these demerits but also improve the quality of linerboard. We introduce the "Total Wet-end System" with reduced alum dosage, which can offer a solution to the difficulties including the contribution to the environmental protection, quality improvement, and increase of the productivity in linerboard.


Reduction in Effluent Load by Proper Wet-end Chemistry

Koichi Tadaki, Tomoko Asada, Miho Kato and Shigeru Kurose
Chemicals for Pulp & Paper Technical Dept., Somar Corporation

 In recent paper industry, global environmental protection is a big concern beside productivity, run ability and quality improvement. Increased recycled fiber usage promoted by global resource protection and environmental concern brings more foreign materials such as pitch and anionic trash in papermaking system.
 At Somar we have been working on wet-end improvement agent "REALIZER A Series" as functional coagulant which maximizes the effect of variety of wet-end chemicals. Latest polymer technology help us to develop another functional retention aids as "REALIZER R Series" and "REXER FX Series" which are effective in fine and ash retention. Synergistic effect of the combination of these chemicals to improve wet-end performance is referred as "AXISZ SYSTEM". In addition to these chemical developments, long experience in slime control technology in papermaking process at Somar helps us to develop most effective biocide system "CURECIDE SYSTEM". The optimum wet-end control system could be built though the use of our chemical system which gives maximum effect with minimum chemical dosage. Possible reduction in many wet-end chemicals contributes lowering effluent load as well.
 This paper describes the effect of reduction in effluent load by optimizing wet-end operation using "AXISZ SYSTEM" and "CURECIDE SYSTEM".


Density Decreaser for Paper
- MUSCUT Series -

Yuichi Tomoda, Takashi Tanaka and Youichi Mukougawa
Paper & Pulp Group, Specialty Chemical R&D Department
Research & Development Division, NICCA CHEMICAL CO., LTD.

 Recently, "kasadaka-shi", that is high-bulky paper or low-density paper, has been widely used for book paper and paperboard. Low-density paper is combined with chemicals, fillers or large amount of pulp that makes bulkiness of paper. NICCA CHEMICAL has led and developed a cationic type density decreaser with sizing effect and entered the market with MUSCUT K-300. MUSCUT K-300 imparts not only bulkiness and sizing effect but also opacity, whiteness and softness for paper. Also, it shows less pitch trouble and less foaming on actual operation because of its self- fixing ability. We have strained for cationic density decreaser system and have continued to study and develop. Emulsion type products had been the mainstream in cationic type density decreasers. But we have developed a new solid cationic type named MUSCUT KF-2000. We would like to introduce its characteristics and applications.


Data Management of "SmartView®" Inspection System

Atsushi Kurosaki
Surface Inspection Systems Division, COGNEX K.K.

 The Cognex SmartView® Inspection System provide historical and real-time inspection data to PC workstations on the mill-wide network, and to equipments (PLC, DCS, Plant Information System etc.) via OPC/ODBC. The SmartView® OPC Data Access software provides increased flexibility in roll summary data collection, real-time defect data collection, and system status and event monitoring. The SmartView® Data Archive with ODBC enables customers to access historical inspection results using customer-developed data analysis tools or Production Quality Advisor (PQA). PQA is a powerful suite of data analysis and display tools for viewing both current and historical production quality data from Data Archive Servers.


Effects of Pigments Shape on Paper Properties - II

Etsuya Misawa
IMERYS MINERALS JAPAN K.K.
Rajan R. Iyer
IMERYS Pigments for Paper Americas

 It is well known that the flat shape of kaolin particles contribute to paper/print gloss and opacity in coated paper. Flatter particles give improved coverage and smoother surface properties for coated paper. This leads to improved coating structure and results in better print gloss. On the other hand, blocky ultrafine particles generally show advantage on sheet gloss.
 Thus, the combination of flatter and finer particle is assumed to achieve both characteristics. However to measure a pigment's aspect ratio is a time consuming procedure, so there seems to be few detailed studies of the correlation between the aspect ratio and particle size and the affect on coated paper properties.
 This study aimed to research the effect of the pigment's aspect ratio and particle size on coated paper properties in heavy coated paper in particular, in order to understand the interactive mechanism of such unique characteristics.


Influence of Diffused Light on Visual Perception of Print Gross in Coated Paper

Takeshi Watanabe, Nobuhiro Matsuda and Hisashi Matsui
Polymer Research Laboratories, JSR Corporation

 Recently, coated paper is required characteristics of visual perception components like print gloss, sheet gloss and brightness and so on. It is a trend in the differentiation of the coated paper quality to give the product these components. "Print Gloss" is especially an important final quality of coated paper.
 However, for the print gloss, as for ''the specular gloss'' measured with standard gloss meter and ''the visual perception of print gloss'' that man feels in sense, all might be not the same, and be different.
 In this study, we considered that the visual perception of print gloss was influenced by permeation, absorption and diffusion of light in the ink layer (resins and ink pigments) and the coating layer (pigments and binders), in addition to ruggedness on printed surface, and investigated clarification of the key factor and the quantification of the visual perception of print gloss with using goniophotometer and scanning white-light interferometer.
 As a result, it was found that the roughness on the printed surface of 10μm or less influenced to the visual perception of print gloss, furthermore the internal diffuse reflection light in the ink layer and the coating layer greatly influenced. And then the quantification of the visual perception of print gloss was also able to be established, it reported with this paper.

Keywords: coated paper, visual perception of print gloss, goniophotometer, internal diffuse
       reflection light


Express Moisture CD and MD

Nakano Reijiro
Sales Development Dept., Honeywell Japan Inc.
Mikio Kojima
Honeywell Process Solutions,Honeywell Japan Inc.

 Most CD moisture profiling devices are controlled from profiles obtained at the reel or, in the case of fine paper machines, possibly from the pre-size press scanner. In recent years, there is a continuing trend toward obtaining a flat moisture profile from the press section, and as a result, some mills have installed moisture scanners following the press section to control the sheet moisture profile. The reasons for this include the desire are to operate the press section in an even loading mode, to separate problems originating in the dryer section from those originating in the press section and to produce a uniform CD sheet bulk out of the press section.
 In terms of MD Moisture, water removal in the press section is relatively inexpensive compared to moisture removal using steam heated dryers. Removal of an additional 1% of moisture in the press section can decrease the steam requirements in the dryer section by 4%, making it more economical to remove moisture mechanically than by evaporation. Methods for improving pressing moisture removal efficiency to reduce the moisture removal load on the dryer section are continually sought. So the actual moisture measurements in press would contribute to optimize the press section.
 The Fiber Optics Moisture Sensor provides both CD and MD accurate and reliable measurements in wet press and dryer section over a broad range of paper grades, from tissue to heavy board, and of moisture levels, from bone dry sheets at the size press to high levels at the wet press. New generation of moisture sensor consists of a light source, an optical fiber for delivering the radiation to the web, a monitoring optical fiber and two detectors. The light source and all electric devices are located to outside of the machine, designed for maximum reliability, long operating life, and minimized maintenance requirements. This paper presents the Honeywell new developed Moisture sensor and applications.


For Achievement of Environmental Standard in Gulf of Toyama
- Reduction of Nitrogen / Phosphorus in Drainage -

Hirokazu Kondo
Nomachi Mill, Chuetsu Pulp & Paper Co., Ltd.

 The achievement of environmental standard situation of COD in Gulf of Toyama changed in the low situation of 32-60% after 1997. It was concluded that a rise of COD was Inside Production of photo plankton which assumed mineral nutrition salts (nitrogen / phosphorus) from land level nourishment source in investigation of Toyama prefecture in 2001, and an action of premeditated reduction of nitrogen / phosphorus in Manufacturing and The sewerage treatment was judged with need. This paper introduce an action in Nomachi Mill for corresponding to a plan of Toyama prefecture.


Effect of External Fibrillation on the Retention of Filler

Taegeun Kang and Hannu Paulapuro
Helsinki University of Technology, Laboratory of Paper Technology

 The purpose of this study was to examine the effect of external fibrillation of chemical pulp fibers on the retention of filler during sheet forming in a high-vacuum dewatering device. An ultra-fine friction grinder was used to prepare fibers with different degrees of external fibrillation, while keeping their internal fibrillation constant.
 The entrapment of filler particles was found to increase with increased internal fibrillation of fibers in the presence of chemical aid, and it can be further increased by promoting mostly external fibrillation of fibers. Increasing the degree of external fibrillation alone, without changing the internal fibrillation, can be used as means to control the retention of filler.

Keywords: External fibrillation, Internal fibrillation, Ultra-fine friction grinder, Filler, Retention