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Volume 47, Issue 4
Displaying 1-11 of 11 articles from this issue
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On the Utilization of Fiber Lumen Loading and Micropore LoadingKatsuhisa Fujiwara1993 Volume 47 Issue 4 Pages 437-448
Published: April 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThis review is of the research and development of inorganic filler composite pulps prepared by either lumen loading or micropore loading. These composite pulps are not only valuable for high performance paper but also suitable for environmental harmony due to its biodegradability and recyclability.
This paper reports four kind of pulp and papers, i. e. (1) fiber lumen loaded with titanium dioxide by high turbulence (2) fiber lumen loaded with ferrite by high turbulence (3) fiber lumen loaded with ferrite by in situ chemical reaction and (4) fiber micropore loaded with nickel carbonate and calcium carbonate by precipitation method.
It was suggested that the inorganic filler composite pulps should be of practical use for high performance papers in the future.View full abstractDownload PDF (3328K) -
Ryutichiro Kurane1993 Volume 47 Issue 4 Pages 449-459
Published: April 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSRhodococcus erythropolis produces a kind of microbial flocculant. This bioflocculant was able to efficiently flocculate all the suspended solids tested in an aqueous solution. Among those tested were microorganisms such as E. coli and baker's yeast, activated sludge, algae, kaolin clay, muddy water, river bottom sediment, ash and charcoal powder. The bioflocculant NOC-1 from Rhodococcus erythropolis has a wide flocculating activity against both organic and inorganic materials.
From an aqueous solution of a water soluble pigment, removal of the water soluble pigment was attained by the bioflocculant NOC-1. The bioflocculant NOC-1 was able to efficiently flocculate and precipitate the soluble pigment in an aqueous solution tested. Among those efficiently tested were black ink, melanoidin pigment (blackish brown pigment) and black colored pigment of the black liquor of pulping industry.
This bioflocculant was purified, and was found to be composed mainly of protein. This bioflocculant is biodegradable flocculant which causes no problem of environmental pollution.View full abstractDownload PDF (5990K) -
Kenichi Yamazaki, Tetsuo Ishikawa, Yoshihiko Hattori1993 Volume 47 Issue 4 Pages 460-464
Published: April 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSEffects of latex Tg, starch level in color recipe and interval time between coating and drying on offset print mottle were studied. Coating colors were coated by a SDTA pilot coater. Coated samples were printed by RI print tester and commercial sheet-fed offset press and print mottle tendencies were evaluated. Starch and latex contents at coated surface were measured and relationships between print mottle and the surface binder contents were discussed. Temperature at the coated surface during drying process was measured and the influence of latex film formability on print mottle was also discussed.View full abstractDownload PDF (2135K) -
Application to New Bleaching SequencesD. Lachenal, F. Wable, P. Damiens, H. Ledon1993 Volume 47 Issue 4 Pages 465-471
Published: April 01, 1993
Released on J-STAGE: April 23, 2010
JOURNAL FREE ACCESSThe major changes occurring in lignin during H2O2 bleaching of mechanical pulp under conventional conditions (70°C ; 5% H2O2) were investigated by thioacidolysis. The only detected change was the degradation of some carbonyl groups, likely by the HOO- anion. The main interunit bonds in lignin were left unaffected. As a consequence no delignification is expected when H2O2 is applied on a kraft pulp unless the conditions are modified. Delignification occurred at 90°C but the cellulose molecules were damaged. A dramatic improvement was observed when part of the metal ions present in pulp was removed by an EDTA pretreatment. Since at the same time, delignification, brightness and DP of cellulose were increased it is likely that the anion HOO- was still playing a key part in the process. It was shown that H2O2 (P) under these conditions can be advantageously combined with O2 (O) in O/P or O-P type treatments. Bleaching sequences like OPD (D for ClO2) or OPZ (Z for ozone) were investigated.View full abstractDownload PDF (988K) -
Tadashi Fukuda, Katsumi Fujisawa, Toshikatsu Komatsu, Shuhei Maruya1993 Volume 47 Issue 4 Pages 472-479
Published: April 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe “RGP 76 CD Refiner” that was installed in Kushiro Mill Jujo Paper Co. Ltd. first in Japan, has been successfully operating since January 1991.
This report is described its operating experience.View full abstractDownload PDF (960K) -
Takashi Kon, Ryojiro Katsube, Kazuma Yoshimoto1993 Volume 47 Issue 4 Pages 480-494
Published: April 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (2139K) -
1993 Volume 47 Issue 4 Pages 495-504
Published: April 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (14977K) -
[in Japanese]1993 Volume 47 Issue 4 Pages 505
Published: April 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (253K) -
A. Sawatari, K. Sakurai, T. Ohhashi, M. Matsui1993 Volume 47 Issue 4 Pages 506-516
Published: April 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSWhatman # 1 filter paper, handsheet from softwood bleached sulfate pulp (abbreviated as NBKP hereafter), handsheet from thermomechanical pulp (abbreviated as TMP hereafter) and regenerated cellulose film were treated with 401 watts/m2 of corona discharge for the duration of 0 to 180 min. Some changes were examined in the SEM images of the cellulose fibre sheets, in the sheet strength and in the sheet porosity by the increase in the duration of the corona treatment. The following results were obtained.
(1) The SEM images changed with the Whatman # 1 filter paper, the handsheet from NBKP and the handsheet from TMP. That is, perforation or boring occurred in the case of the higher duration of 30 min. and 60 min. But, no changes occured with the regenerated cellulose film, as the duration of the corona treatment increased.
(2) The tensile index and Young's modulus of the fibre sheets decreased gradually but significantly with the increase in duration of the corona discharge treatment. At that time, the zero span tensile strength also decreased slightly. The tensile index and tensile modulus decreased also in the case of regenerated cellulose film with the increase in the duration.
(3) As the duration of corona treatment increased, the cellulose fibre sheets became more permeable. The porosity and mean pore radius obtained by the mercury intrusion method also increased with the increase in the duration. However, no changes occured in permeability with the regenerated cellulose film, even in the duration of 180 min.
From the above-described facts, the corona-induced defects is considered to partly bring about the decrease in the cellulose fibre sheet strength.
Another mechanism should be considered further from the fact that the tensile strength and the tensile modulus decreased with the increase in the duration for the regenerated cellulose film. A certain fraction of the more microscopical framework which resists against an external force, must be degradated by the oxidation processes. Both mechanism are proposed to affect the reduction in cellulose sheet strength by the corona treatment for a long duration. At the present state, the importance of the two mechanisms cannot be estimated for the reduction in the sheet strength.View full abstractDownload PDF (8007K) -
Direction III Strength of Single-Faced Corrugated FiberboardShigeo Matsushima, Tadashi Yano, Satoru Matsushima, Toshiaki Yokota1993 Volume 47 Issue 4 Pages 517-528
Published: April 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSRelations between the strengths of single-faced corrugated fiberboard and the shapes or Young's modulus of the kraft liner (KL) and the semichemical corrugated medium (SCP medium) are analyzed under the uniform bending around the moment axis in the machine direction. Values of EfS (bending strength per unit mass for SCP medium) and Eks (strength per unit mass for KL) are discussed.
Obtained results are as follows;
(1) Absolute maximum stresses σsmax and σkmax of SCP medium (CM) and KL decrease with the increase of thickness Ts and wave height h for CM and thickness Tk for KL, and also increase with the increase of wavelength L for CM.
(2) σsmax decreases and σkmax increases with the increase of Young's modulus Ek for KL.
(3) Efs decreases initially and comes to increase gradually with the increase of T. On the contrary, EfS increases at first, then turns to decrease gradually with the increase of L. Efk increases with the increase of Ts and decreases with the increase of L. Efs increases and Efk decreases with the increase of Ek and Tk.View full abstractDownload PDF (1545K) -
[in Japanese]1993 Volume 47 Issue 4 Pages 529-537
Published: April 01, 1993
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (1367K)
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