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Volume 39, Issue 2
Displaying 1-8 of 8 articles from this issue
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Technology on Kraft Pulp Bleaching with Hydrogenperoxide and OzoneMakoto Iwasaki1985 Volume 39 Issue 2 Pages 197-208
Published: February 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSIn this paper following articles are briefly rewied.
1) Trend of Hydrogenperoxide bleaching
2) Technology of Hydrogenperoxide bleaching and delignification
3) Manufacturing method of Ozone
4) Influence of process conditions on Ozone bleaching
5) Technology of Ozone bleaching (Labolatory scale)View full abstractDownload PDF (1713K) -
Masaji Kurosatva1985 Volume 39 Issue 2 Pages 209-219
Published: February 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThis paper describes the development and usage of honeycomb structure made of ceramic paper and inorganic binders.View full abstractDownload PDF (8651K) -
Shinich Inoue1985 Volume 39 Issue 2 Pages 220-224
Published: February 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSTakasaki Paper Mfg, Co., Ltd. introduced a new high load biological waste water treatment system into its Osaka plant in September 1981.
The system has been satisforily operated without any trouble such as odor, noise etc., furthermore it has been able to manage a big-wide change of load.
This system with its compact is especially recomendable for an urban type factory like ours, who has a ristriction on a plant site and strict environmental regulations.
Also it is suitable for a closed water system.View full abstractDownload PDF (2294K) -
Tokyo Division, Jujo Paper Board Co., Ltd.Jujo Paper Board Co. Ltd.1985 Volume 39 Issue 2 Pages 225-230
Published: February 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSJujo Paper Board Co., Ltd. was established in 1964, and incorporated Senju Paper Co., Ltd. in 1983.
The division is located in Soka City, Saitama Prefecture and has a capacity of 1211 T/D of paper board (linerboard, corrugating medium and chipboard) with 4 paper board machines.
Last year, No. 3 and No. 4 paper board machines which produce corrugating medium and chipboard have started its operation.
The division site area is about 108, 000 m2 and the number of employees is about 240.View full abstractDownload PDF (12850K) -
1985 Volume 39 Issue 2 Pages 231
Published: February 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (125K) -
Masayuki Ozeki, Raysabro Oye, Sadatoshi Miura1985 Volume 39 Issue 2 Pages 233-242
Published: February 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDurability of papers, such as acid and neutral wood free papers, Japanese Kozo (Broussonetia papyrifera) and Gampi (Wikstroemia retusa) papers, as well as handsheets from Mitsumata (Edgeworthia papyrifera), Kozo, Manila hemp and softwood sulphate pulps, were compared by means of degradation rate or relative durability obtained from Arrhenius plots of folding endurance at various temperatures and relative humidities. It was confirmed that papers or handsheets from bast fibres for Japanese paper-making were less degradable compared with those from wood pulps.
Influences of acidity and sulphate ion concentration at handsheet making were also investigated. It was not perceivable that sulfate ion concentration was adversely so effective to durability of paper as acidity, which deteriorated properties of papers from bast fibres as well as from wood pulp.View full abstractDownload PDF (1209K) -
Makio Hasuike, Koji Murakami1985 Volume 39 Issue 2 Pages 243-250
Published: February 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSInterrelationships between optical properties and layered structure of the sheets from beaten thick-walled (TK) elements and from mixture of thin-walled short (TNS) elements and lightly beaten TK elements were discussed quantitatively by applying the layered model theory developed by Scallan and Borch.
The “apparent” layer thickness, t', determined from the experimental values of reflectance and basis weight by using Eq. [3A] was a good structural parameter which relates optical properties to layered structure of the sheets especially from highly bleached pulp elements. Since the layered structure of real sheet is different from the parallel layered model illustrated by Scallan and Borch, it is pointed out that the “apparent” layer thickness, t', is practically affected by two geometrical parameters of the sheet, the layer thickness in z-direction, tf, and anisotropy parameter, s, and expressed as t'=tf/ε. The tf estimated by analyzing the cross sections of the sheets and t' from optical data for the thick-walled element sheets are tabulated in Table 3.
Peculiar characteristics in optical properties of the sample sheets were found. The opacity and specific scattering coefficient of the sheets from beaten TK elements increase with the progress in beating and those of the sheets from the mixture of TNS elements and TK elements also increase with the increase in the content of the TNS elements (Table 2 and Fig. 4). The increase in specific scattering coefficient indicates that optically effective surface area of the sheet increases. It was reflecteted on the increase in the number of optically effective layers. n0, and on the decrease in “apparent” layer thickness, t', of the sheets (Table 3).
These structural changes in the thick-walled element sheets estimated from the optical data could be supported by the layered structure observed on the cross sections of the sheets (Fig. 3). In the case of beaten TK element sheets, thin filmy layers were found among the element-to-element spaces due to the separation of TK elements during beating process. In the sheets from mixture of TNS elements and TK elements, the TNS elements were located in the sheets like a bridge between TK elements.View full abstractDownload PDF (6673K) -
PAP prepared from Leucaena latisiliqua (L) Gillis (Ip. PAP)Akio Mita, Kenji Kanazawa, Susumu Kashiwabara, Nobuharu Hara, Akihiko ...1985 Volume 39 Issue 2 Pages 251-259
Published: February 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSStudies were carried out on the preparation of a new chemical pulp from Leucaena latisiliqua (L.) Gillis chips (Ip. chips) by Hydrogen peroxide alkali (PA) process.
The cooking liquor of PA process is an aqueous solution containing, hydrogen peroxide, sodium hydroxide (as H 2 O 2 2% and Na 2O 20% based on dry matter) and small quantities of auxiliaries (EDTA 0.3%, anthraquione 0.1%). The liquor ratio to Ip. chips is 4.5 l/kg.
Hydrogen peroxide alkaline pulp (PAP : Total yield of 41-57%, rejects of 2.7-7.5% and screened 38-49%) was obtained from Ip. chips after cooking for one hour at 180-190°C.
By this process there was no need for recourse to disc refiners or other like processing machines.
The analyses of the unbleached pulp (Ip. PAP) were kappa no. 14.7-22.1, and brightness 28.5-35.0% Hunter. PAP 102 (Total yield 57.0%, rejects 7.5%, screened 49.5%, kappa no. 22.1) has breaking length 4.3 km, burst factor 2.3, tear factor 66, and folding endurance 11 at C.S.F. 448 ml.
Ip PAP 110 (Total yield 41.2%, kappa no. 14.7, brightness 35.0% Hunter) could be bleached to brightness 70.0% Hunter by one stage with sodium hypochlorite.View full abstractDownload PDF (6702K)
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