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Volume 50, Issue 10
Displaying 1-11 of 11 articles from this issue
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Ryouichi Tagami1996 Volume 50 Issue 10 Pages 1371-1383
Published: 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESS -
Kohji Masamizu, Junta Egawa, Masaaki Hagiwara, Toshiyuki Ukigai1996 Volume 50 Issue 10 Pages 1384-1390
Published: 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSIn Japan, consumption of printing/information paper (OA paper) is increasing and consequently so is office wastepaper (OWP). To cope with increasing tonnage of OWP more applications for deinked OWP must be found and mix ratios in existing recycle content papers must be increased. This goal can be accomplished through improving the quality of OWP deinked pulp.
To date most OWP in Japan is incinerated to protect confidential information and because the quality of OWP pulp limits its use. With increasing OWP tonnage civil and economic pressure is building to develop effective OWP deinking technology.
We responded by a study of deinking toner inked plain paper copy paper (PPC) and for control purposes included research on deinking conditions which effect ink detaching and collecting using newspaper offset inks.
It became clear that the factors influencing deinking toner inks are significantly different from those of offset inks in newspapers. We found toner inks are much more difficult to detach than offset inks. But by increasing process temperature, increasing ink removal energy (mechanical energy) and the inclusion of chemically specific deinking agents, high quality OWP pulp can be produced.
In this paper, we analyze the variety and characteristics of deinking agents from an interfacial scientific standpoint.View full abstractDownload PDF (1067K) -
Masao Nishimura1996 Volume 50 Issue 10 Pages 1391-1405
Published: 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSPaper drying mechanism in dry part of paper machine is to supply necessary heat to each dryer so as to dry wet web up to stipulated water content by means of raising gradually the temperature of water and pulp in wet web and evaporate water gradually. In many cases, the heat is made of steam. The steam turns into condensate in each dryer by radiating heat.
In order to increase wet web drying efficiency and to increase production volume, it is indispensable to exhaust the condensate which is produced in each dryer with high efficiency. And it is also indispensable to supply steam to each dryer through economical feeding systems.
To achieve the purpose, it is necessary to know accurate supply steam volume and accurate condensate volume produced in each dryer.
In this technical description, I have concluded how to calculate above two volume. Both the accurate supply steam volume and the accurate condensate volume make it possible to design economical drainage system.View full abstractDownload PDF (2367K) -
Chuichi Honma1996 Volume 50 Issue 10 Pages 1406-1414
Published: 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThis paper describes web inspection system, surface sensor and sheet sensors for a new generation of quality control system (optimum), especially exhibited at SPCI Stockholm Sweden June 4-7, 1996.View full abstractDownload PDF (1228K) -
Wood Science Committee1996 Volume 50 Issue 10 Pages 1415-1432
Published: 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESS -
May 610, 1996 at Auckland, New JealandTerunobu Fukui, Hiroyuki Yamaguchi, Yuji Abe, Kiyoaki Iida1996 Volume 50 Issue 10 Pages 1433-1444
Published: 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESS -
[in Japanese]1996 Volume 50 Issue 10 Pages 1445
Published: 1996
Released on J-STAGE: November 16, 2009
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Formation of a fusant having ability for depression of light-induced color reversion of mechanical pulps by protoplast fusion of Phanerochaete chrysosporium and Fusarium solaniSanro Tachibana, Miyuki Wada, Kazutaka Itoh, Tomohito Itoh, Tae Oki1996 Volume 50 Issue 10 Pages 1446-1455
Published: 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSA protoplast fusion between Phanerochaete chrysosporium and Fusarium solani was tried to form a fusant having higher ability for depression of light-induced color reversion of mechanical pulps than that of the parental strains. The maximum yield of protoplasts from P. chrysosporium was obtained by a combination of 2% Cellulase “ONOZUKA” R-10 (CR), 2% Novozyme-234 (NV) and 0.2% Chitinase. In the case of F. solani, the maximum yield of protoplasts was obtained by a combination of 2% CR and 2% NV. It was found that magnesium sulfate was more effective than mannitol as osmotic stabilizers. Protoplasts from P. chrysosporium and F. solani were fused with polyethlene glycol. Fusants which were grown on a minimal medium agar plate were screened on a malt-extract agar plate containing 2, 6-dichloroindophenol sodium salt as a reductive indicator, and two fusants, fusant 1 and 2 having the ability for the depression were obtained. By analysis of the isozyme patterns of the fusants and the parental strains, the fusants were found to be fusant strains between P. chrysosporium and F. solani. Reactivity between extracellular crude enzymes solution from the fusants and a substrate, methoxy-p-quinone was examined. Formation of methoxyhydroquinone and 3, 4-dimethoxyphenol from the substrate was observed. However, in some cases, formation of small amount of 3, 4-dimethoxyphenol or no formation of the phenol was recognized.
Pretreatment of unbleached thermomechanical pulp (TMP) with extracellular crube enzymes from the fusants was found to give remarkable effect on depression of light-induced color reversion of TMP. The color reversion of TMP could be depressed almost 100% and 81% by fusant 1 and 2, respectively. The ability for the depression of the fusants was higher than that of the parental strains. However, it was found that the ability for the depression of the fusants was largely decreased after four subcultures of the fusants.View full abstractDownload PDF (1680K) -
Comparison of Spent Liquor of Alkali-Methanol-Anthraquinone Cooking with Kraft Black LiquoZensaku Abe1996 Volume 50 Issue 10 Pages 1456-1461
Published: 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe spent liquor (black liquor) of alkali-methanol-anthraquinone cooking (AMA) of beech (Fagus crenata) was compared with beech kraft black liquor to get the better understanding of AMA pulping.
The results are summarized as follows :
(1) The yield of syringol and guaiacol formed in AMA cooking of extractives-free wood meal were 0.50 and 0.25% based on original wood, while in kraft cooking 0.18 and 0.17 %.
(2) The color of AMA lignin was light yellow-brown and L*a*b* it by using a colormeter were 48.0, 8.8, and 21.0. The color of kraft lignin was dark brown and L* a* b* of it were 30.6, 3.7, and 8.8.
(3) Ultraviolet absorbance E (lg-1cm-1) of AMA lignin at 230-300 nm was a little higher than that of kraft lignin. On the other hand, the E of AMA lignin at 300-400 nm was lower than that of kraft lignin.
(4) The ionization difference spectrum (ΔEi) of AMA lignin at 250-260 nm was about 1.5 times of that of kraft lignin. AMA lignin has more free phenolic hydroxy group than kraft lignin.
(5) Therefore, the mechanism of delignification in AMA pulping is very different from that of kraft pulping.
(6) The evaporation rate of AMA black liquor on the heating hot plate at 120°C under atmosphere was more than twice of that of kraft black liquor.
(7) The AMA black liquor concentrated to one-fifth of its original volume was liquid at room temperature, while the kraft black liquor concentrated to the same level was high viscous liquid.View full abstractDownload PDF (910K) -
1996 Volume 50 Issue 10 Pages 1462-1467
Published: 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (896K) -
[in Japanese]1996 Volume 50 Issue 10 Pages 1468-1471
Published: 1996
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSDownload PDF (707K)
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