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Volume 54, Issue 12
Displaying 1-15 of 15 articles from this issue
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Takeomi Ono2000 Volume 54 Issue 12 Pages 1603-1609,011
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn the area of sheet formation, calenders play apparently very important part to decide final paper quality.
Lately multi nip machine calenders are required long experienced skill to gain stable CD profilecorrections by excluding roll deflection of nip forces, annular deformation caused by thermal profilingand correlation of variations affected by differences.
Recently, several profiling systems have been developed to minimize such variation during finalcalendering. Particularly, soft nip calendering has been remarkably introduced with its correction capacityfor better smoothness, printability and tensile strength. Superior correction potential of soft nipcalendering is reported here in comparison of machine calenders with the examination of several factorsaffecting CD profiling
Further. Crown Controlled Roll for eliminating narrow and broad wave profile deviations is introducedwith precise explanation of design and functional concept, correction potential and its control systems.View full abstractDownload PDF (3231K) -
A Future View in CalenderingKei Iwanaga2000 Volume 54 Issue 12 Pages 1610-1617,011
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSExciting new calender innovations are changing the way different paper grades are finished. They provide potential for more on-line capabilities than previously, as they can operate at faster speeds andstill produce papers with better surface and structural characteristics. Besides high-speed soft-nip calenders.Valmet has recently introduced and started up new Opti Load multinip calenders and Opti Dwelllong-nip calenders.
A grade-by-grade vision of where the calendering process is heading gives a direction for conceptsand expected results. The grades discussed range from newsprint to uncoated woodfree and SCgradesas well as different coated papers.
The new Opti Concept Paper Machine will utilize on-line calendering to a great extent. It is expected, however, that off-line calendering continues to be the primary concept of finishing most highendpaper grades, such as double-coated and triple-coated printing papers. It will be interesting to seehow quickly, and to what extent, the new long-nip calendering process is applied to finishing of certainuncoated mechanical and woodfree papers.View full abstractDownload PDF (4010K) -
Center Drive TF ReelHiroshi Kotake2000 Volume 54 Issue 12 Pages 1618-1623,012
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSRecently, the winding size has been gotten larger and the production has been diversification. So, it has been more difficult to wind without wrinkle and burst at reel. But the traditional surface reel cannot clear these needs because it can not control the torque of winding.
IHI developed the new “TF (Twin Force) Reel” for resolution of these problem. TF reel can control the torque winding and the nip pressure at one time by center drive of the primaryand secondary.View full abstractDownload PDF (1125K) -
Center Wind ReelKatsuhiko Michiura2000 Volume 54 Issue 12 Pages 1624-1631,012
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIt has been confirmed theoretically and experimentally that a center winding reel is effective to wind larger diameter paper roll without wrinkle or burst of the sheet. MHI products two types centerwinding reels and these names are MH Reel-W and MH Reel-CWC.
The MH Reel-CW has the basic concept that is even and steady for paper winding. During operation, the spool moves only on the level rail without transfers of torque and nip. The first domestic MHReel-CW has been installed to wind the super calendered paper and is operating successfully.
The MH Reel-CWC has the structure of conventional surface reel added primary and secondarycenter wind equipment. Therefore a conventional reel can be rebuilt easily to the MH Reel-CWC. The MH Reel-CWC in Japan are operating well and winding larger diameter paper roll than conventionalreel.View full abstractDownload PDF (1688K) -
Takashi Sasaki2000 Volume 54 Issue 12 Pages 1632-1641,012
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSBM 9000 CS. the QCS system by Yokogawa Electric Corporation, is equipped with many kinds of control functions that cope with various types of paper machines. Among them, this paper presents thelatest CLP profile control algorithm and new grade change control of steam pressure that makes use ofdryer model.
The latest CLP profile control adopts finite settling response method that can settle the response tothe objective value in the finite time interval. Moreover, it has the auto-tuning function that defines thecontrol parameters automatically, and adaptive control function that automatically adjusts the controlgain according to cyclic disturbances.
The new grade change control that makes use of dryer model is now under development, and thataims to enhance the accuracy of steam pressure prediction and make the work of control tuning moresimpleView full abstractDownload PDF (2391K) -
Noriyuki Watanabe2000 Volume 54 Issue 12 Pages 1642-1648,013
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSAt present, though QCS is used in paper process normally, it was originally developed for the purpose of the measurement and quality control. After that, MD control, CD control and various optimizationcontrol have been added, and then, QCS is becoming to be unified with DCS, and MES as well today.
This time, I would like to think about the composition and principle of quality measurement sensor, a basic part of QCS, again.View full abstractDownload PDF (3579K) -
Outline of Automatic Web Inspection System and Advanced SystemKenji Ogino2000 Volume 54 Issue 12 Pages 1649-1655,013
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn 1965, OMRON developed Automatic Web Inspection System (WIS) that detects holes and dark spots on paper.
WIS have been improved year by year according to the requirement of customer and our advancedtechnology. WIS is classified into 4 generations. On 2 nd generation, CCD-camera type systemwas developed and data processing function was greatly improved using by μ CPU. WIS got position ofquality control system in Paper Industry. On 3 rd generation, Image-System was developed.
By using Image-System, operator can recognize detected fault and can remove its cause. On 4 thgeneration, WIS was greatly advanced by combination with Image-System. In the coming near future.new WIS will be developed by advanced technology that will include detection by using color-CCDcamera and an automatic pattern-based fault classification system.View full abstractDownload PDF (3236K) -
Shinya Monma2000 Volume 54 Issue 12 Pages 1656-1660,014
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSN 2 PM for newsprint was started up in February, 1998. at Nippon Paper Yatsushiro Mill. The design speed of this paper machine is max. 1, 700m/m. The wire wid this 9, 050mm.
This paper machine is one of the wide and high speed machines in the world. This machine has alot of the newest equipments based on the newest paper making technologies in the world or Japan. andthe automatic equipments. Our mill can efficiently produce and continuously supply the best qualitynewsprint to the press rooms of Kyushu area by this N2PM.
This paper mentions about the outlines from the dryer part to reel part and the operating experienceat these parts from start-up. As for the outlines, the configuration of this N 2 PM dryer is the topdeck and single canvas dryer at the both of pre-dryer part and after-dryer part. And the calender isthe soft-nip calender, because we can reduce the two-sidedness of paper, and produce good printabilitynewsprint by this calender. The users already recognize the newsprint quality of N 2 PM is the best.And as for the operating experience, this paper mentions about the sheet break and the paper threading.We are going to try to operate this paper machine at 1, 700m/min the future.View full abstractDownload PDF (1473K) -
Dry End OperationMasaaki Ohba2000 Volume 54 Issue 12 Pages 1661-1664,014
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe Tomakomai mill. Oji Paper. started producing paper in 1910. It has been modified and upgraded very much since then. Nowadays, it is one of the biggest newsprint mills in the world.
The N-6 Newsprint machine, which is the newest machine in Tomakomai mill, started producingnewsprints in April 1998 in order to stabilize future supplies of newsprints and meet the severe qualityrequirements from the newspaper companies.
The N-6 machine was equipped with a lot of cutting edge technologies. We have been aiming abuilt-up of papermaking technologies at the highest machine speed in the world and improvements ofthe paper quality.
Two and half years passed since the start-up and the machine is being operated at the present machinespeed (1, 450-1, 550m/min) in spite of various troubles. In the near future, we hope that we willoperate the machine at 1, 600m/min by using the operating experience, which we have been getting, and new ideas.
This paper will report four points of the operating experience about the dry end of the N-6 machine.
1. CARB bearings (the newest attempt in Japan)
2. Modified stationary siphons (correspond with CARB bearings)
3. Guiders at the dryer parts (troubles and countermeasures)
4. TNT-C (against the bigger diameter of a parent reel)View full abstractDownload PDF (1643K) -
Kiyoaki Iida2000 Volume 54 Issue 12 Pages 1665-1669,014
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSEvery industry in Japan is working on the project inheriting and transferring its industry's technical legacy to next generation. JAPAN TAPPI also started to deal with it a couple of years ago. The projecthas two categories. One is collecting description on technologies, paper product samples and manufacturingequipment and sorting them in database. The other is to make them available for public andlet them speak their history for the next generation.
As the project needs support from those worked in the industry. JAPAN TAPPI is asking helpfrom volunteers in all aspects including basic project planning.View full abstractDownload PDF (897K) -
[in Japanese]2000 Volume 54 Issue 12 Pages 1670
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (250K) -
Development of Optimized Flow Based on the Mechanism of Enzymatic DeinkingMitsuhiro Sugino, Mitsuo Takai2000 Volume 54 Issue 12 Pages 1671-1678,015
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIt is important to elucidate the mechanism of enzymatic deinking and establish the optimized enzymatic deinking flow to realize enzymatic deinking method. We have already reported that the combinationof mechanical action and enzyme activity is very important and that enzyme reduce mechanical energyto get the same residual toner level of the control pulp. In this paper, we compared several treatmentflows to establish the optimized enzymatic deinking flow. Kneading is very effective for the cleantonerconversion and reduction of residual toner area. And to get the same residual toner area of finalpulp as control. kneading energy could be reduced by enzyme as 30% while it was added at pulper.Concerning the optimized enzymatic flow, we compared pulper addition with kneader addition. Consequentlykneader addition with agitated soaking gave the best result. Hairy toner ratio of the optimizedenzymatic deinking flow was smaller than conventional pulper addition method. Moreover to get thesame residual toner area of final pulp as control, kneading energy could be reduced by enzyme as 50%in the case of kneader addition. As a result of that, the damage of fiber by kneading could be decreasedand sheet strength was improved. New process gave 10% reduction of kneading energy to get thesame residual toner area as by usual alkaline deinking. Therefore it could be concluded that the optimizedenzymatic deinking flow was superior to not only reported enzymatic deinking but also conventionalalkaline deinking.View full abstractDownload PDF (2474K) -
Tsutomu Noguchi, Kazuki Satake, Hidemi Tomita2000 Volume 54 Issue 12 Pages 1679-1685,015
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSCO2 emission of the packaging for a video camera recorder were evaluated. We measured the emission involved in transporting the raw materials and molded samples and producing the molded. The emission involved in the disposal of packaging were not considered. We determined that molded pulp made of recycled pulp has lower CO2 emission (-77%) than expanded polystyrene (EPS) made of virgin material because molded pulp does not need to be subjected to the steam-expansion process and because the packaging can be stacked so it takes up less space while being transported.
The weight of molded pulp packaging must be kept within four times that of the EPS packaging if the CO2 emission of the molded pulp packaging are to be less than that of the EPS packaging.
The evaluation of a molded cushion added to a carton of corrugated fiberboard shows that molded pulp made of recycled paper produces -34% less CO2 emission than the new EPS although the use of corrugated fiberboard increases the weight 40%.View full abstractDownload PDF (2485K) -
Takanori Miyanishi2000 Volume 54 Issue 12 Pages 1686-1698,016
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSA computer model was developed to simulate modified kraft cooking digesters such as MCC, EMCC, ITC and Lo-Solids and to compare their performances with the conventional kraft digester. Results from the computer model showed that extension of cooking zone into the Hi-heat washing zone was a key to modified cooking. The content of xylan in modified cooked pulp was higher than that in the conventional pulp. As hardwood chips contain more xylan than softwood chips, it was predicted that the pulp yield increase in modified cooking would be more pronounced in hardwood kraft pulp than in softwood kraft pulp. An order of pulp yield and viscosity of hardwood kraft pulp from two-vessel digesters was as follows: Conventional<MCC<Lo-Solids<EMCC<ITC. A low packing degree of chips was obtained by simulation of Lo-Solid cooking, which explained the smooth downward movement of a chip column and a stable kappa number in the Lo-Solids cooking.View full abstractDownload PDF (3900K) -
2000 Volume 54 Issue 12 Pages 1699-1700
Published: December 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (391K)
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