Journal of the Japanese Technical Association of the Pulp and Paper Industry
Online ISSN : 1884-4731
ISSN-L : 0370-0313
Volume 3, Issue 3
Displaying 1-9 of 9 articles from this issue
  • Yoshinari Sannomiya, Satoru Kakumoto
    1949 Volume 3 Issue 3 Pages 2-8,52
    Published: June 20, 1949
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    The more pitch trouble was experienced by cylinder machine than by the fourdrinier during the season of June-Sept. last year at Geibo mill of Nippon Shigyo K.K. The actual condition of pitch trouble at the mill and the extent of damages are described. As possible preventives, the uses of alum cake and infusorial earth in the beater are suggested. Some of the measures being adopted at Geibo mill are as follows.
    1) Elimination of pitch trouble by means of saponification and washing of resin from the wet pulp in the digester.
    2) Addition of 5-10% talc or clay.
    3) Addition of 14% alum cake.
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  • Nobuo Amii
    1949 Volume 3 Issue 3 Pages 9-12,52a
    Published: June 20, 1949
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    The mucilage obtained from special plant called “ Noriasa” recently developed by Prof. Kagawa of Kyoto University, has been experimented for Japanese paper making at Takasago Mill of Mitsubishi Paper Co. The mucus content of Noriasa is found to be less compared with Tororoaoi but the effect on paper making is about the same. Besides, microscopical examinations show that the mucilage obtained from Noriasa has very much the similar sharacteristics of Tororoaoi, especially with respect to elongation of the mucous liquid, drop in viscosity due to lapse of time after extraction, diminishing of viscosity at higher temperature, changes in viscosity is unmarkeetc. The fact that Noriasa grows in high spirits in hot summer when Tororoaoi due to stirring, table, might be of worth for thepaper makers to notice.
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  • Gijiro Saiki
    1949 Volume 3 Issue 3 Pages 13-14,52b
    Published: June 20, 1949
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    The idea that the fourdrinier is after all the cylinder having infinite radius, has brought about the application of the fourdrinier paper making to the cylinder machine as reported in this paper. The device is so made that the flow of well stirred stock is directly let out to the rotating cylinder without use of vat. The new method has the following characteristies.
    1) Vat is no longer required
    2) Packing in between vat and cylinder not necessary.
    3) Prevents loss of power which is due to friction.
    4) Increase durability of felt.
    5) Saves space when several cylinders are installed.
    However, as to what types of paper can be profited by this method and how fast the machine can be run are the problems to be studied in future.
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  • Mitsuo Nagayama
    1949 Volume 3 Issue 3 Pages 15-16,53
    Published: June 20, 1949
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    In order to be able to maintain uniform quality of Tengujo paper for export, it is maintained that the specifications are necessary. It is questionable that the same testing method used for foreign style paper is applicable to Tengujo. Therefore, standard specifications of mimeograph base paper as well as new testing method applicable to Tengujo have been devised. For details, refer to “ Studies on Tengujo ” in Seishi Shiryo No. 1.
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  • Meisuke Ueno
    1949 Volume 3 Issue 3 Pages 17-22,53a
    Published: June 20, 1949
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    It is pointed out that the pulp made by this process is quite suitable for making wrapping and bag paper as well as vulcanized fiber substitute, paper container etc. The preparation of cooking liquor is described and particularly, cooking operation and gas recovery are explained with experimental data. The following points are made clear
    1) Composition of cooking liquor is limited to the proportion of CaO : S=1 : 1 with 3% concentration respectively.
    2) In cooking, the liquor is charged so as to leave air space in the upper part of the digester.
    3) Cooking pressure is 120 lbs per sq. in. while cooking time, 1012 hours.
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  • Junsaburo Yamamoto, Gaku Sei
    1949 Volume 3 Issue 3 Pages 23-29,53b
    Published: June 20, 1949
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    Studies have been made on the possible factors affecting bulk No. The bulk Nos. of alkali cellulose obtained from different rayon pulps under the same conditions were compared. Some of the conclusions reached in this study are as follows.
    1) No positive effect is observed by hemicellulose during alkali steeping.
    2) No distinct effect on the pressed ratio and shredding curve.
    3) The higher the steeping temperature, the shorter the shredding time, although this tendency is not very notable.
    4) The longer the steeping time, the better the shredding action
    5) Shredding works better at 40°C than at 20°C but when the temperature gets to 60°C, it is no longer good because shredding swiftly completes and powderized and the bulk No. suddenly advances.
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  • Hiroshi Yeguchi, Hachiro Yoshikawa
    1949 Volume 3 Issue 3 Pages 30-38,53c
    Published: June 20, 1949
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    Studies on the possible utilization of hardwoods by kraft process have beencarried out. It is concluded that from the standpoint of cooking time, yield and strength, it is best to use hardwoods with conifers in 50-50 proportion in weight or about 40% of hardwoods in volume mixed with conifers. The following are some of the results.
    1) It takes less time to cook hardwoods than soft woods inspite of the hardness.
    2) Pulp yield is about 5% higher in the case of hardwoods.
    3) Alkali consumption per digester is higher for hardwoods. Chlorine No. 5 of hardwoods corresponds to chlorine No. 10 of conifers approximately.
    4) Heart-wood and sap-wood usually result in lack of uniformity even under the same cooking condition.
    5) Pulp made from hardwoods gives maximum strength at around chlorine No. 5. Breaking length and bursting strengths are about the same as conifer-pulp but tearing strength drops to 2/3 of conifer-pulp.
    6) The maximum strength is observed when the proportion of mixture of hardwoods and conifers is 50-50 with anexception of tearing strength.
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  • Sogo Yenokibara
    1949 Volume 3 Issue 3 Pages 39-40,54a
    Published: June 20, 1949
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    Studies on the computation of power required by pulp separator have been carried out with some actual experimental data.
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  • A. S. Cosler
    1949 Volume 3 Issue 3 Pages 41
    Published: June 20, 1949
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    Download PDF (183K)
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