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Volume 39, Issue 5
Displaying 1-8 of 8 articles from this issue
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Coaters (1)Jujiro Kohno1985 Volume 39 Issue 5 Pages 435-444
Published: May 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSIn the 2nd Report, I would like to introduce the recent trends of various types of coating machine for printing papers other than that of pure blade type.
While the coating machine of pure blade type has been the mainstream for the production of coated papers, other types of coating machine such as air knife coater, rod coater and roll coater have now been highly evaluated once again for the production of specialty papers because of their own peculiar performances that can not be realized by the pure blade type. The improvements toward higher speed runnability and larger control range of coat weight have put spurs to this extensive utilization.
The hydro-bar as a new means of metering is also described.View full abstractDownload PDF (3117K) -
Kinichi Shimohira1985 Volume 39 Issue 5 Pages 445-456
Published: May 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSIn this paper following articles are briefly reviewed.
(1) Composition and manufacturing process of offset ink.
(2) Theoritical mechanism of setting and drying of offset ink.
(3) New various drying methods of offset ink.
(4) Deinking of news prints.View full abstractDownload PDF (1673K) -
Eiichi Matsumoto1985 Volume 39 Issue 5 Pages 457-463
Published: May 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThis paper reviews briefly on New Kamyr Continuous digester's development processes.
1) The four main types of Kamyr Continuous Digesters are being described :
Hydraulic type Digester
Single Vapour/Liquor Phase Digester
Two Vessel Vapour/Liquor Phase Digester
Two vessel hydraulic type Digester
2) Extended Delignification reviewing about pulp quality and bleachability.View full abstractDownload PDF (1051K) -
[in Japanese]1985 Volume 39 Issue 5 Pages 465-468
Published: May 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSNordiskafilt has developed a press felt with a seam. The felt is installed open-ended like a dryer canvas and is then joined on the paper machine. This development, a joint project with Nordiskafilt and Fiskeby AB in Shärblacka, has led to faster and easier installation, cleaner felt, and added a new dimension to press felt design. The article introduces results at Shärblacka PM 9.View full abstractDownload PDF (6987K) -
Part 1 : Modeling of Web Drying in a Dryer SectionKiyoaki Iida1985 Volume 39 Issue 5 Pages 469-476
Published: May 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe drying process in a papermachine dryer section is regarded as the accumulation of heat and mass transfers at the both surfaces of a web and those along the z-direction of a web. Based on this concept, several computer models of web drying in a dryer section have been proposed since 1970.
These models, however, run usually on high speed computers, which seem to restrict their availabilities for studying the various phenomena of drying processes in details.
The new model is developed in this report, based mainly on Snow's and Hinds's model, and have following characteristics.
It requires more input data than its predisessors, such as atmospheric data and cylinder surface temperatures at each dryer cylinders. It, on the otherhand, can be simulated with any operating conditions, actual as well as hypothetical, by specifying them at each cylinders, and gives closer looks at drying phenomena at any locations in a dryer section. The model is verified to be reliable with several mill operating conditions, by comparing the simulated web temperatures at the middle of every free runs to those observed.
Then, its simplified version, which assumes the uniformity in z-direction of a web in contrast to the original model of a ten layer structure, is tested, and found that it gives almost the same results as those by the multi-layer model. This means that the heat and mass transfer in z-direction are not rate determining in web drying, and can be negligible with ordinary printing papers.
This simplified model has many advantages. It can run on personal computers with one whole simulation of a dryer section in about ninety minutes, and be simulated very easily at any given dryer conditions.
Studies by this simplified model will be reported in successive series.View full abstractDownload PDF (934K) -
(1) Study forevaluating latex distribution atcoatedlayer surfacesTadahira Hamada, Masahiro Kohno1985 Volume 39 Issue 5 Pages 477-485
Published: May 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe study was undertaken to evaluate the degree of latex (SBR) distribution at the coated layer surfaces by means of EPMA (Electron Probe X-Ray Microanalyser).
It was found that the latex of coated layer was able to be tagged with osmium by exposing the specimen to osmium tetroxide vaper for over 6 hours and the X-ray intensities of osmium were proportional to latex contents of coated layers. EPMA technique analyzes as thin layer as a few microns from the surface, so, the degree of latex migration to the surface can be evaluated semiquantitatively by this technique.
The similar results were obtained by exposing the specimen to bromine for1015 minutes instead of osmium tetroxide.
The results obtained using energy dispersive spectrometer (EDS) were compared with those obtained from wave length dispersive spectrometer (WDS).
WDS proved more effective in this kind of analysis owing to its higher peak to background ratio and better spectral dispersion.View full abstractDownload PDF (9728K) -
Bagasse SOX PulpAkio Mita, Takashi Saeki, Katsushi Sugiyarma, Yoshinori Yazawa, Takash ...1985 Volume 39 Issue 5 Pages 486-498
Published: May 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe yield, the strength, etc. of pulps prepared by SOX, Mg-SP, NSSC, KP, AP, RMP, and lime pulping process from the same lot of bagasse (without depithing) were compared. An improvement of the strength and/or brightness of bagasse pulp prepared by SOX process (SOXP) was attempted by blending unbleached and bleached kraft pulp prepared from soft wood (NUKP and NBKP) in it.
Maximum yields of baggsse pulps obtained by those process are 73.2% (SOX), 74.8% (AP), 68.7% (lime pulping), and 83.6 (RMP). The breaking length, burst factor, and tear factor of SOXP at the yield of 62.4% were 3.4 km, 1.5, and 27, respectively. The breaking length, burst factor, and tear factor of KP at the yield of 41.1% were 7.1 km, 4.5 and 48, respectively.
The strength of SOXP was remarkable improved by blending NUKP and or NBKP in it. The paper and paperboard made from SOXP are considered to be applicable to packing materials.View full abstractDownload PDF (1543K) -
1985 Volume 39 Issue 5 Pages 499
Published: May 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (140K)
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