JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
Search
Advanced search
OR
Browse
Search
Volume 22, Issue 12
Displaying 1-8 of 8 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • [title in Japanese]
    [in Japanese]
    1968 Volume 22 Issue 12 Pages 47-54
    Published: December 01, 1968
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.22.12_47
    JOURNAL FREE ACCESS
    Download PDF (8414K)
  • [title in Japanese]
    [in Japanese]
    1968 Volume 22 Issue 12 Pages 57-59
    Published: December 01, 1968
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.22.12_57
    JOURNAL FREE ACCESS
    Download PDF (5314K)
  • [title in Japanese]
    [in Japanese]
    1968 Volume 22 Issue 12 Pages 591-598
    Published: December 01, 1968
    Released on J-STAGE: January 22, 2010
    DOIhttps://doi.org/10.2524/jtappij.22.12_591
    JOURNAL FREE ACCESS
    Download PDF (9974K)
  • Wood Characteristics and Kraft Pulp Properties of Hardwood grown in Hokkaido
    Motoo Miyake
    1968 Volume 22 Issue 12 Pages 600-610
    Published: December 01, 1968
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.22.12_600
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Wood characteristices and kraft pulp properties from eleven kinds of hardwood grown in Hokkaido were examined, and then the correlation between the properties of woods and their pulps were studied.
    The results were as followes :
    1) Specific gravity of woods correlated with lignin content (+) * and holocellulose content (-), and besides correlated with fiber width (-), lumen width (-), and the ratio of fiber width to lumen width (-).
    2) Pentsan and α-cellulose content in pulp were correlated with their content in wood (+) respectively, therefore the chemical properties of pulp may be inferred by the results of chemical analysis of wood.
    3) The yield of pulp was strongly correlated with α-cellulose content in the wood (+).
    4) Important factors affecting on the breaking length and burst strength of pulp-sheet were the fiber length (+) and the ratio of fiber width to lumen width (+), and the former was slightly more importand than the latter. Also the tear strength was most affected by fiber length (+).
    5) Sheet-density was found to be correlated with the ratio of fiber width to lumen width (+) and pentsan content (+). And breaking length and burst strength were primarily correlated with the density (+). But tear strength is most affected by fiber length (+), then the density.
    6) Correlation between 0-span breaking length and pulp-sheet strength was found to be relatively slight.
    * Sign indicates whether relationship is positive (+) or negative (-)
    View full abstract
    Download PDF (2805K)
  • Changes of Strength Properties of Wood Pulps with Cellulase Treatment
    III Changes of Strength Properties of Semi-Chemical Pulp
    Yoshitaka Ogiwara, Kenichiro Arai
    1968 Volume 22 Issue 12 Pages 611-616
    Published: December 01, 1968
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.22.12_611
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Unbleached semi-chemical market pulp from coniferous wood (USCP) and bleached one prepared from the former (BSCP) were hydrolyzed with powdered cellulase, and the changes of the strength characteristics of paper sheets as well as some variables assumed to affect the strength were studied. Tensile and tear strength of the pulps decreased with the time of cellulase treatment.
    From the changes of characteristics including that of yield of pulps with the cellulase treatment, water retention value (WRV), fine content, specific volume of web, pentosan content, number-average fiber length and lignin content, the following facts were inferred :
    (1) Changes in tensile strength of BSCP with cellulase treatment were caused by the decrease in interfiber hydrogen bonding and interfiber friction because of the decrease in fiber length, fine content and pentosan content ; the results were similar to those obtained in our previous study made with kraft pulps.
    (2) In spite of the fact that fine content and WRV of USCP increased considerably with cellulase treatment, specific volume of the web increased definitely ; the web became bulky as the lignin content in USCP increased with the cellulase treatment, and the tensile strength decreased.
    (3) Changes in tear strength with cellulase treatment were considered as the results of lowering of fiber length both in USCP and BSCP as well.
    View full abstract
    Download PDF (862K)
  • Automatic Analyzer for the White Liquor
    Jiro Endo
    1968 Volume 22 Issue 12 Pages 617-620
    Published: December 01, 1968
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.22.12_617
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The automatic analysis for the each alkaline content of the white liquor was investigated by the method of potentiometric titration. As a result, an automatic analyzer was tentatively developed. The white liquor can be analyzed automatically at the set up intervals of option, then, the each alkaline content is calculated easily from the titration curves.
    View full abstract
    Download PDF (2301K)
  • [title in Japanese]
    [in Japanese], [in Japanese]
    1968 Volume 22 Issue 12 Pages 621-627
    Published: December 01, 1968
    Released on J-STAGE: May 07, 2010
    DOIhttps://doi.org/10.2524/jtappij.22.12_621
    JOURNAL FREE ACCESS
    Download PDF (12975K)
  • [title in Japanese]
    J. L. Betts, G. G. Wilson
    1968 Volume 22 Issue 12 Pages 628-634
    Published: December 01, 1968
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.22.12_628
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    [in Japanese]
    View full abstract
    Download PDF (4393K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top