JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 32, Issue 10
Displaying 1-8 of 8 articles from this issue
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  • My Recollections of the Improvements in Paper Making (Supplement)
    Itsuki Nishi
    1978 Volume 32 Issue 10 Pages 548-554
    Published: 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.10_548
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1978 Volume 32 Issue 10 Pages 555
    Published: 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.10_555
    JOURNAL FREE ACCESS
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  • Pulp and Paper Mills in Japan (3)
    -Kishu Mill, Kishu Paper Co., Ltd.-
    Kishu Paper Co. Ltd.
    1978 Volume 32 Issue 10 Pages 556-565_1
    Published: 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.10_556
    JOURNAL FREE ACCESS
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  • Summarization of Responses to Questionnaire sent to Member Companies and Others Concerning the Less Odor Recovery Boiler of Kraft Mill
    [in Japanese], [in Japanese]
    1978 Volume 32 Issue 10 Pages 566-583
    Published: 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.10_566
    JOURNAL FREE ACCESS
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  • Effect of Shrinkage during Drying on Dimensional Stability of Paper
    Tsuneaki Kijima, Isao Yamakawa
    1978 Volume 32 Issue 10 Pages 584-592
    Published: 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.10_584
    JOURNAL FREE ACCESS
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    Dimensional stability of papers made from hardwood and softwood bleached sulfate pulps has been studied. This report deals with the effect of the sheets shrinkage during drying. The results obtained are summerized as follows :
    1) Dimensional stability was directly related to shrinkage during drying in both cases of hardwood and softwood sheets. But the effect of the beating on dimensional stability differed between hardwood and softwood bleached sulfate pulp.
    2) When handsheets were prepared from unbeaten or slightly beaten pulps, dimensions of the sheets from softwood pulp were more changeable than those from hardwood pulp. As beating was greatly increased, dimensional stability of paper from hardwood pulp decreased more rapidly than that from softwood pulp. These results were caused by the difference of fiber morphology. In early stage of beating, softwood fibers were more flexible and easier in contact with each other than hardwood fibers, and therefore, paper prepared from softwood fibers was inferior in dimensional stability to those from hardwood fibers. In the range of low C.S.F., however, hardwood fibers were short in length and contacted with each other effectively, so sheets made from these fibers shrinked extremely during drying. Consequently, the paper thus obtained was very unstable in dimensional stability.
    3) The sheets dried under tension to prevent from shrinking were very stable in dimensional change when compared with the sheets dried without tension. Relations between shrinkage in sheet volume and dimensional stability differed in drying conditions. Fibers in the sheets dried under tension contacted with each other poorly because of preventing from shrinking.
    4) The handsheets dried under or without tension (1 st step drying) were immersed in water sufficiently, then they were dried again under either conditions (2 nd step drying). Properties of the sheets thus obtained were more affected by 2 nd step drying condition than 1 st step condition. In case of wet strengthen paper, however, effects of 1 st step drying condition were prominent.
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  • Studies on Flocculation and Sedimentation Treatment of Pulp Mill Effluent (Part 3)
    Recovery and Reuse of Alum Sludge
    Tsutomu Horikoshi, Osamu Ebinuma, Masaru Yamakoshi
    1978 Volume 32 Issue 10 Pages 593-598
    Published: 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.10_593
    JOURNAL FREE ACCESS
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    The principal object of this paper is to recover and reuse of Alum sludge. Alum will be used as a coagulant for COD (Chemical Oxygen Demand) and colour removal.
    We studied on some processes of recovering the Alum by reaction with sulfuric acid and utilizing sulfur dioxide from the gas of boiler stack as a source of sulfuric acid.
    The results are summarized as follows :
    (1) The ash of Alum sludge prepared at high pH (about 12.0) with Ca (OH) 2 was extractable with sulfuric acid, if it was incinerated at high temperature (about 900°C). The sludge thus prepared was reusable.
    (2) Alum sludge which was made at low pH (58) was activated by adding Ca (OH) 2 or CaCO3 betore incineration. The ash was extractable with sulfuric acid and the Alum was recovered. It was possible to provide for a closed system.
    (3) It was possible to utilize SO2 gas from an oil boiler as a source of sulfuric acid.
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  • Study on the Morphology of Paper-making Hemps. II
    Effect of Beating on Non-wood Fibres.
    Hiroshi Hara, Lâm Thi Bach Tuyêt, Raysabro Oye
    1978 Volume 32 Issue 10 Pages 599-606
    Published: 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.10_599
    JOURNAL FREE ACCESS
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    Neutral sulphite semi-chemical pulps were prepared from kenaf and flax and beaten to varied freeness. Morphological changes in the fibre structure were observed with scanning electron microscopy after freeze drying and structural changes in hand-sheet were measured with the mercury porosimeter.
    At the same freeness level, kenaf pulp showed higher density, stretch, breaking length, burst factor and stiffness than those from flax pulp, though flax pulp fibres were larger in diameter and developed more external fibrillation.
    Concerning porous structure, it was found flax sheet had more recesses on the sheet surface and more pores than kenaf.
    It can be concluded that flax pulp was easily subjected to external fibrillation and kenaf pulp to internal fibrillation, which rendered to higher strength and faster air permeability.
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  • [title in Japanese]
    1978 Volume 32 Issue 10 Pages Preface1-Preface3
    Published: 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.10_Preface1
    JOURNAL FREE ACCESS
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