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Volume 54, Issue 11
Displaying 1-17 of 17 articles from this issue
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[in Japanese]2000 Volume 54 Issue 11 Pages 1456
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (521K) -
Development & OperationHiroaki Fujii2000 Volume 54 Issue 11 Pages 1457-1467,011
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn the globalizing age, corporate management is being based on ROE and mergers are popular in the region. Companies want to make the best use of their equipment, which sometimes mean to increase operating speeds. The dryer section of a papermachine becomes critical in that sense. Its configuration and design concept affect paper quality significantly, with complicated pricey equipment tending to produce paper of better quality. So, balanced sense for investment is required and basic understanding on paper drying is also imperative.View full abstractDownload PDF (3576K) -
Kazuhiro Ohira2000 Volume 54 Issue 11 Pages 1468-1474,011
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe basic process of drying paper has not changed for decades. The cylinders heated with steam have been used to dry the wet sheets. However, designing speed of paper machines has recently increased up to 1, 500 m/min and over, even with newsprint and fine paper grade. The high-speed operation is supported by various improvements in sheet run-ability, quality of paper, and energy efficiency.
We introduce our drying concept necessary for high-speed machines, relating it to drying mechanism. in this paper.View full abstractDownload PDF (2351K) -
Satoshi Seki2000 Volume 54 Issue 11 Pages 1475-1480,011
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIncreasing of the paper machine operation speed urges to introduce the new design concept and technology for not only Wet-end but also dryer part.
We, IHI-Voith group. develop the new technology such as the Duo-stabilizer system for single tier dryer layout, the Duo-stabilizator for improved double tier layout, rope-less tail transfer system and the Duo-cleaner which is the cleaning system for canvas, felt and wire with quiet new design in order to solve the problem in dryer part at high speed operation.
This report introduces our new design concept of the high speed dryer for any paper grades not only board grade and the advantage of our new equipments.View full abstractDownload PDF (3407K) -
Hidehiko Yamazaki2000 Volume 54 Issue 11 Pages 1481-1492,012
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSOur first Yankee was on our drawing board in 1891. It was a prototype which was delivered three years later. The Goteborg Mill was our first Yankee customer and the dryer was operating way into the 1980 s. Since then, more than four hundred fifty Yankee cylinders have left our factory in Karlstad, Sweeden. We have developed materials and manufacturing methods. We have made use of stateof-art computer programmes when designing the dryers. The casting process has been refined, machining takes place in computer-controlled equipment. Yankee dryers of jumbo size are found in tissue machines with a production speed of more than 2, 000 m/min.
Besides, in tissue machine. innovatory TAD (Through Air Drying) technology has been developed. Quality of household paper was greatly improved with the technology.
On the other hand, an innovatory technology, Impingement Dryer for paper and board machines to attain much higher drying rate than conventional steam cylinder dryers was invented. It is the key drying unit of OptiDry drying section. This will help paper machines attain a machinespeed over 2000 m/min in very near future.
Finally, other innovatory drying technology for paperboard is described. That is Condebelt, which is a straight through type of dryer based on press drying. No size press and no calender are necessary with Condebelt. Condebelt attains high smoothness and exceptionally high sheet strength even using low grade of pulps.View full abstractDownload PDF (5730K) -
Dryer Section Ventilation and Runnability SystemsKoji Masuda2000 Volume 54 Issue 11 Pages 1493-1499,012
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDryer sections were for a long time based on double-felting. Because of machine speed up, the single-felting has been further and further extended through the dryer section. and the dryer sections of the faster machines of today are in practice totally based on single-felting. Also during this transition from one concept to another, the demands on dryer section ventilation and runnability systems have changed.
Regarding Sumitomo/Valmet totally enclosed hood, the dryer section is separated from the machine room, and the benefits are:
1) Energy economy, 2) Runnability improvement, 3) Paper quality improvement
Sumitomo/Valmet Blow Boxes would achieve:
1) Excellent pocket ventilation, 2) Runnability improvement
Suitable blow box concepts for any paper grade and machine configuration commercially could be proposed.
In a machine if today, the ventilation and runnability systems should be an integral part of the paper producing process and could not be separately designed from the rest of the dryer section.View full abstractDownload PDF (4064K) -
Yoshiyuki Omori2000 Volume 54 Issue 11 Pages 1500-1509,013
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSPaper machines have been continuously getting wider and faster though the remarkable change in the drying section has not been taken place in terms of the basic drying theory and the mechanical structure since the multiple drying cylinder system was developed. As the latest paper making technology, highlighting the paper making technology with high speed machine, I'd like to introduce some results of our study on dryer fabrics, especially, on the structure, airpermeability, surface smoothness and light reflecting character on dryer fabrics for single tier drying system which will be the mainstream of the future paper making machines. In connection with this single tier drying, the drying system that incorporates both single tier drying-cylinders and air caps is also refered to.I also report about the running stability of dryer fabrics and the disposition of felt rolls which enable the paper side of dryer fabrics not to touch on felt rolls, which is one of the effective measures to solve such problems as picking and sheet break caused by contamination on dryer fabrics.
Besides above, I also report the correlation between surface smoothness, boundary layer air of dryer fabrics and the device for sheet running stability as well as the methods for stable operation of dryer fabrics and high performance materials for dryer fabrics.View full abstractDownload PDF (3872K) -
Dry End OperationManabu Itoh, Jun Azetaka2000 Volume 54 Issue 11 Pages 1510-1516,013
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSNo.51 paper board machine (No.51 PM) started up in May 1992 with the purpose of both succeeding the 4 scrapped paper board machine grade and getting into a new business for double-side coated bleached paper board business. The daily capacity is about 250 T. the wire width is 3, 950mm, the reel width is 3, 550mm, and the design maximum speed is 450m/m. The main section and the support equipment for No.51 PM have been supplied by Kobayashi Engineering works, L.T.D. It has been 8 years since the start-up, however, the quality of No.51 PM' s products keeps its fame in terms of printability. press efficiency. and so on.
No.51 PM has 4 on-line coater heads, 2 stacks softnip calenders, and 6 rolls hardnip calender stacks which are before and after the coater heads. As one of the pioneers for the recent trend of the combination of on-machine coater and gloss-purpose calender, No.51 PM has developed various experiences and improvements in terms of runnability, safety, productivity. and cost savings. Especially the dryer to reel area has improved its runnability.
In this report, we will mainly introduce the operating experience in the dryer to reel of No.51 PM.View full abstractDownload PDF (3018K) -
Osamu Yoshikawa2000 Volume 54 Issue 11 Pages 1517-1522,013
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe N 8 paper machine of the Niigata Mill started up in July 1998, to increase production capacity of coated paper and to improve the paper quality. This machine is the 3 rd large paper machine at Hokuetsu Paper that equipped on-machine coater. and adopted the state-of-the-art technology in the various points to achieve high productivity and good quality together.
We have been in operation for 2 years from the startup of the N 8 paper machine. During operation. the repeating improvement was continuously established to ensure high efficiency and good quality of a higher level.
This paper reports on the operation experience of the dryer part. The focus of topic is SYM-RUN Dryer Section mainly, that equipment was the first introduction to our company.View full abstractDownload PDF (3325K) -
Minoru Kumasaki2000 Volume 54 Issue 11 Pages 1523-1528,014
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe 20 th century is that of fossil fuel. The coming 21 st century will be that of after-fossil-fuel energy. The paper focuses on biomass as a new energy source, and describes its characteristics, supply capability, possibility of a small scale power generation system from biomass and potentiality of bioenergy in Japanese forest industry.View full abstractDownload PDF (1563K) -
[in Japanese]2000 Volume 54 Issue 11 Pages 1529
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (232K) -
[in Japanese]2000 Volume 54 Issue 11 Pages 1532
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (258K) -
Hiroshi Ono, Yasuyuki Kamijo, Takanori Miyanishi2000 Volume 54 Issue 11 Pages 1533-1545,014
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSRecent trends such as increased production and decreased fresh water usage requires the development of more efficient retention and drainage aids. We synthesized cationic polyvinylphenol (vinyl benzyl trimethylammonium chloride-vinylphenol copolymer) as a newly developed cofactor for a polyethyleneoxide based retention system.
Maximum fine retention and drainage was obtained by using cationic cofactor with 30 mol% of cationic group and 70 mol% of phenolic hydroxide group. It was postulated that the charge and charge density of vinyl phenol based cofactor was the most important property. Instead of cationic cofactor, we used pDADMAC and PFR and compared this system to a conventional PFR (phenol formaldehyde resin)/PEO system. Maximum fine retention and drainage was obtained by using pDADMAC and PFR with 45 mol% of cationic group and 55 mol% of phenolic hydroxide group. It was postulated that pDADMAC was adsorbed onto both pulp fiber and PFR, therefore the optimum ratio of cationic group was higher than the case of cationic cofactor.
PFR adsorption amount was measured when pDADMAC was added to the pulp slurry containing 20% PCC filler. pDADMAC addition increased the adsorption amount of PFR onto the pulp slurry. When comparing the PFR/PEO and the pDADMAC/PFR/PEO systems, the collision frequencies among pDADMAC, PFR. PEO molecules and PCC particles suggest that the bridging component of the overall retention mechanism is different. The main bridging component for the PFR/PEO system was the PFR-PEO complex while for the pDADMAC/PFR/PEO system the bridging component was the PFR-PEO complek and the PEO itself. It was revealed that the optimum addition of coagulant further increased the fine retention and drainage when using PFR/PEO system.View full abstractDownload PDF (2909K) -
Effects of Press-Drying on Restraining Surface Roughening of PaperKiyoshi Sasaki, Toshiharu Enomae, Fumihiko Onabe2000 Volume 54 Issue 11 Pages 1546-1554,015
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSPress-drying, that is, a concurrent process of wet-pressing and drying is potential to restrain surface roughening because it provides strong interfiber bondings. Press-dried handsheets for thermo-mechanical pulp (TMP) and hardwood bleached kraft pulp (HBKP) were compared with calendered handsheets in terms of response to water treatment.
It was found that the water absorption rate was much lower for press-dried handsheets than calendered ones. This can be attributed to the structural differences as clearly shown by scanning electron micrographs, where fibers of press-dried sheets appeared intensively densified near the heated-side surface, while those of calendered sheets were transversely uniform in density. The dense structure peculiar to press-drying was considered to obstruct water penetration. Furthermore, press-drying effects on restraining surface roughening was confirmed by the result that even at the same level of water absorption, roughening of the press-dried sheets was much lower than that of the calendered sheets for TMP.In contrast, effects of press-drying on restraining surface roughening were not so striking for HBKP, probably because of some degree of its irreversibility observed even for the calendered sheet. Consequently, it was considered that water was allowed to penetrate through small intraand interfiber pores gradually and that hornification of the fiber walls caused by heat and pressure in press-drying prevented fibers from swelling that would lead to surface roughening.View full abstractDownload PDF (3455K) -
Determination of Chloroform Amounts by Solid Phas Micro-extractionHiroshi Ohi, Kiyoshi Masuzawa2000 Volume 54 Issue 11 Pages 1555-1563,015
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSSolid phase micro-extraction (SPME)/headspace gas chromatography (GC) is well known as a method for analysis of volatile compounds. The SPME method was applied to estimating the amount of chloroform formation from reactions of kraft pulp and lignin model compounds with chlorinated compounds. In addition, spent liquors from bleaching stages of a hardwood bleached kraft mill were analyzed. Then. the chloroform formation in the bleaching process with chlorinated compounds was discussed on the basis of the results from the model experiments together with the spent liquors.
The reaction was carried out in a closed vial, and volatile compounds were sampled and injected directly to GC by the use of the SPME. Guaiacol and syringol gave chloroform in a yield of 120, 000 ppm after reacting with the excess amounts of NaClO. Eucalyptus kraft pulp with kappa number 14.4 was treated with 2.5% active chlorine dose (chlorine ratio 0.17). The amounts of chloroform formation were 280 ppm for the chlorine treatment (pH 1.2, and then adjusted to pH 12.1), 450 ppm for the hypochlorite treatment (pH 10.7), and 20 ppm for the chlorine dioxide treatment (pH 4.0). The chloroform concentrations of the spent liquors from C-Ep-H-D stages were 0.47ppm, 0.44ppm, 12ppm, and 0.18 ppm, respectively.
The chloroform formation are estimated at 430ppm (3, 000 t for seven millions ton pulp) for the C-E-H-D process and 29 ppm (200t for seven millions ton pulp) for the D-E-D-D process. The mechanism of chloroform formation with chlorine dioxide should be studied further.View full abstractDownload PDF (2150K) -
2000 Volume 54 Issue 11 Pages 1564-1570
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (3091K) -
[in Japanese]2000 Volume 54 Issue 11 Pages 1571-1573
Published: November 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (928K)
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