All issues
Volume 44, Issue 4
Displaying 1-6 of 6 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hiroyoshi Hosomura, Koichi Makiyama1990 Volume 44 Issue 4 Pages 417-432
Published: April 01, 1990
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSIn sophisticated Office Automation (OA) systems, electronic information exchange is evolving, and data is increasingly kept in electronic storage materials such as magnetic and optical discs. But in the office place, hardcopies are still required to deal with the information captured on disks, transmitted through OA networks and visualized on the screens of video display terminals. Paper remains the most important material as a hardcopy substrate. For transferring electronic information onto paper, non-impact printing technology is the wave of the future.
Xerography and “Plain Paper” or Cut Sheet Xerographic Paper are a promising technology combination in non-impact printing. This technology team is forecast to be applied and expanded for all upcoming hardcopy systems with higher speed and quality, not only digital and full-color copying machines but also printers, facsimiles and multi-function hardcopy terminals.
The technology of Cut Sheet Xerographic Paper is being developed at the request of innovative hardware and customer demand. Alkaline paper technology enabled xerographic paper to solve the copy quality problems of talc-acid paper which also limited its archival property. Recently, alkaline xerographic paper technology became a main stream in Japanese xerographic paper trends.View full abstractDownload PDF (1775K) -
Sumiko Hikami, Yoshiaki Shoji, Toshio Kasai, Yonekichi Tanaka1990 Volume 44 Issue 4 Pages 433-446
Published: April 01, 1990
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThis report explains the technique of recovery and reuse from the white water :
(1) The technique by the high rate packed synthetic fiber,
(2) The technique by the clarifier and the high rate filter,
(3) The technique by the biological treatment, the clarifier and the high rate filter,
They select the system (1) or (2) according to the concentration of SS in raw water.
The report says sterilization by UV further.
The result of (1) is SS of treated water=410 mg/l. The result of (2) is 12 mg/l. The result of (3) is COD of treated water<10 mg/l, SS=12 mg/l. The terated water of (3) should be able to use for shower water.View full abstractDownload PDF (3469K) -
Revision of Standard Energy Unit Requirements of pulp and paper products Part 2 PulpEnergy Committee JAPAN TAPPI1990 Volume 44 Issue 4 Pages 447-459
Published: April 01, 1990
Released on J-STAGE: February 22, 2010
JOURNAL FREE ACCESSDownload PDF (1169K) -
Testing Standards Committee JAPAN TAPPI1990 Volume 44 Issue 4 Pages 460-464
Published: April 01, 1990
Released on J-STAGE: February 22, 2010
JOURNAL FREE ACCESSTo determine the brightness of paper, the Hunter reflectometer has been widely accepted in Japan. However, the Hunter is not so popular in the other countries as in Japan.
JAPAN TAPPI prepared a JIS draft in which a new testing method for diffuse blue reflectance factor (ISO Brightness) of paper and paperboard is described. The present paper deals with the content of this draft as well as the background with which this draft was made.View full abstractDownload PDF (538K) -
Effect of depression of color reversion in TMP by treatment of crude enzyme solution from Pleurotus ostreatusSanro Tachibana, Tomoaki Koyanagi, Masashi Sumimoto1990 Volume 44 Issue 4 Pages 487-495
Published: April 01, 1990
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSPre-treatment of unbleaced thermomechanical pulp with extracellular enzyme solution as well as with crude enzyme solution from Pleurotus ostreatus, a kind of white-rot fungi, followed by alkaline hydrogen peroxide bleaching was found to give remarkable effect on depression of light -induced color reversion of thermomechanical pulp (TMP). The differences in incubation conditions, however, result in considerable differences in depression of color reversion. The highest suppresive depression was observed when unbleached TMP was treated either for 3 hours with the crude enzyme solution from P. ostreatus incubated with a rotary shaker or for 9 hours with that from the fungus incubated in a L-type Monod tube. The optimum pH of the enzymatic reactions to depress such color reversion was 4.5 to 5.0. And furthermore, suppressive depression of color reversion was observed when the lipase activity in the crude enzyme solution was small.
Based on the results of the reactivity between the crude enzyme solution and model compounds, the highest suppresive depression of color reversion was observed when the molar ratio of reduction to oxidation was 2.3. Therefore, this shows that enzyme reactions to reduce the chromophoress seem to contribute mainly to the depression of color reversion, but some of the oxidative reactions also seem to contribute to the depression.
However, almost no effect was observed by the treatment of ground wood pulp (GP) with the enzymatic solution. This suggests that TMP and GP have different chromophores contributing to the respective light-induced color reversion.View full abstractDownload PDF (3332K) -
1990 Volume 44 Issue 4 Pages 496-502
Published: April 01, 1990
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (977K)
- |<
- <
- 1
- >
- >|