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Volume 31, Issue 5
Displaying 1-11 of 11 articles from this issue
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1977 Volume 31 Issue 5 Pages 59
Published: May 01, 1977
Released on J-STAGE: November 11, 2009
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[in Japanese]1977 Volume 31 Issue 5 Pages 60-63
Published: May 01, 1977
Released on J-STAGE: November 11, 2009
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Itsuki Nishi1977 Volume 31 Issue 5 Pages 236-244
Published: May 01, 1977
Released on J-STAGE: November 11, 2009
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1977 Volume 31 Issue 5 Pages 244
Published: 1977
Released on J-STAGE: November 11, 2009
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Part I. What's the Forecasting?Hiroshi Asaoka, Shogo Kachi, Kenji Iiyama1977 Volume 31 Issue 5 Pages 246-253
Published: May 01, 1977
Released on J-STAGE: November 11, 2009
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Eiichi Shiokawa1977 Volume 31 Issue 5 Pages 254-261
Published: May 01, 1977
Released on J-STAGE: November 11, 2009
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Susumu Kashiwabara1977 Volume 31 Issue 5 Pages 262-264
Published: May 01, 1977
Released on J-STAGE: November 11, 2009
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Yasuhiko Kurosawa, Noriji Miyabe, Shunsuke Sakuma1977 Volume 31 Issue 5 Pages 265-269
Published: May 01, 1977
Released on J-STAGE: November 11, 2009
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Effect of the Partially Aminated Polyacrylamides on the Paper Strength Improvement for Various Pulps (especially for news print paper pulp).Kyoji Suzuki, Hiroo Tanaka1977 Volume 31 Issue 5 Pages 270-274
Published: May 01, 1977
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSPartially aminated polyacrylamides (C-PAM) containing the amine units of 16 to 57 mol %, the amide units of 53 to 0 mol % and others were prepared by the Hofmann degradation of polyacrylamide (PAM), and applied to the handsheets of bleached pulp (BKP), unbleached pulp (UKP), news print paper pulp (News P) and waste paper pulp (WP) as wet-end additives. The following results were obtained :
(1) The four kinds of cationic polyacrylamides showed the nearly similar effect on the dry tensile strength. The dry strength improvements for various pulps by the addition of C-PAM increased in the following order; BKP<UKP<News P<WP.
(2) Wet tensile strengths were improved approximately in proportion to the amino group content in C-PAM for any pulps described above.
(3) The dry strength improvements of news print paper pulp handsheets treated with C-PAM at pH 4 were remarkable at the low amino group content, which showed about 30% increase at 0.5% level of addition based on dry pulp. The retention capacity of C-PAM at pH 4 decreased with the increase of its amino group content. When the amino group content increased from 15 mol % to 57 mol %, the amount of retention decreased from 95% to 50% at the 0.5% level of addition (Fig. 5).
These results indicate that the dry tensile property of news print paper pulp treated with C-PAM in an acid medium is intimately related to the amount of retention of C-PAM.
The C-PAM of low amino group content is very useful and practicaly hopeful because of its low cost.View full abstractDownload PDF (633K) -
Katsmi Ooknbo, Tae Oki, Hisao Ishikawa1977 Volume 31 Issue 5 Pages 275-284
Published: May 01, 1977
Released on J-STAGE: January 25, 2010
JOURNAL FREE ACCESSIn order to elucidate the mechanical properties of bleached sulfite pulp, NUSP and LUSP were bleached with peracetic acid (PA) in vapor phase under the following conditions :
Chemicals addition on pulp, 10 to 32% ; DAISERU stabilizer addition on pulp, 0.018% ; pulp consistency, 33% ; temperature, 90°C ; pH 4 ; bleaching time, 60 min for NUSP and 30 min for LUSP.
Viscosity of BSP thus obtained was 4 to 16 cp, and the brightness was 86 to 94% GE. Comparison between the sheet strengths and pentosan content or viscosity of BSP prepared under above conditions was also carried out. The results are summarized as follows :
1. NUSP and LUSP were more easily bleached than NUKP or LUK1 by PA-bleaching in vapor phase. Brightness of both SP, bleached with PA in vapor phase, was 5 to 8% GE higher than that of multistage-bleached SP at the equal pulp viscosity.
2. The decrease in tensile strengh, burst factor, tear factor and folding end. of linter pulp during PA- or multistage-bleaching was attributed to decrease viscosity of the pulp in a cupri ethylenediamine solution.
On the other hand, sheet strengths of PA- or multistage-beached NSP and LSP at the equal freeness increased proportionally with increasing pentosan content in the bleached pulps, except folding end. of multistage-bleached NSP sheet.
3. The ellution pattern of gel filtration of hemicellulose, isolated from NSP with 5% KOH solution, was found to unchange hardly during multistage- or PA-bleaching in vapor phase. Whereas hemicellulose in LSP was partially degraded to lower molecular part during both bleaching. The lower molecular content of hemicellose in the PA-bleached LSP was more than that in the multistage-bleached pulp.
4. Tensile strength and burst factor of PA- or multistage-bleached pulp increased proportionally with increasing sheet density of each bleached pulp at the equal f reeness. The sheet strengths of PA- or multistage bleached KP were stronger than that of BSP at the equal sheet density. From the facts described above, it is assumed that the decrease of DP of polysaccharides in BSP is reduced the sheet strengths of the BP, and also, that the strengths are greater affected by the amounts of pentosan and lower molecular part of hemicellulose in the pulps.View full abstractDownload PDF (1049K) -
Akio Mita, Koichi Nagata, Hiroshi Isono, Toshiaki Nishino, Yuji Kato1977 Volume 31 Issue 5 Pages 285-293
Published: May 01, 1977
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSStudied was the effect of a high content of sodium sulphate in cooking liquor when three types of NSSC high-yield pulps were prepared from two species of hardwood chips.
The three types of NSSC high-yield pulps were NSSC (series I) pulp substitute for USP with 65% yield ca, NSSC (series II) pulp for corrugating medium with 75% yield ca, and NSSC (series III) pulp substitute for GP with 85% yield ca.
The chips were commercial-sized chips A (moisture 8.86%), chips B (moisture 11.84%), and pulp mill chips.
Initially, pre-examinations (conventional NSSC process) were conducted under the conditions that cooking liquor for NSSC (series I, II, and III) was prepared from sodium sulphite and/or sodium carbonate, the chips were cooked (liquor ratio 5l/kg), and the cooked chips were treated with a disk refiner.
Next, sodium sulphate was added to the cooking liquor (as Na2O) in accordance with its mol ratio of 6.25, 12.5, 25, or 100%, and then the cooking liquors were used for the NSSC cooking process.
Under all conditions, the NSSC pulp was prepared without complications, and the pulp yield slightly increased.
Strength of the NSSC pulp (I) and (III) slightly increased; however, the NSSC pulp (II) grade slightly decreased.
When adding sodium sulphate of a mol ratio of 100, the NSSC pulp yield was 70.9% (CSF, 600ml), density 0.54, breaking length 4.1 km, burst factor 2.2, and tear factor 64.
The NSSC pulp (II) yield was 77.5% (CSF, 464ml), density 0.68, breaking length 2.81 km, and tear factor 65. The NSSC pulp (III) yield was 85.0% (CSF 190 ml), density 0.62, breaking length 4.19 km, burst factor 2.37, and tear factor 57, displaying greater strength than conventional GP made from softwood.View full abstractDownload PDF (936K)
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