JAPAN TAPPI JOURNAL

[title in Japanese]

[in Japanese]

1961 Volume 15 Issue 12 Pages 780-784
Published: December 20, 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.780

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[title in Japanese]

[in Japanese]

1961 Volume 15 Issue 12 Pages 785-786
Published: December 20, 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.785

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Relations between Swellability and Some Papermaking Properties of Unbleached Pulps

Hisaaki Toda, Tsuneaki Kijima

1961 Volume 15 Issue 12 Pages 787-790
Published: December 20, 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.787

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Various unbleached pulps were prepared from birch or fir wood, and their papermaking properties were compared.
It is found that the swellability (water retention value) of pulp is also related to the some papermaking properties such as sheet strength (Fig. 1 and 2), scattering coefficient (Fig.3) and brightness (Fig. 5 and 6) for the unbleached pulps prepared by the same process, similarly in the case of the bleached pulps reported previously. The opacity is, however, not related with these properties (Fig. 4)
These tendencies are found even for chemimechanical (Fig. 7) and groundwood pulps and etc.

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Studies on Synthetic Fiber Papers (Part 6)

On the Relationship of the Structural Fiber and its Papers (1)

Tadao Saeki

1961 Volume 15 Issue 12 Pages 791-796
Published: December 20, 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.791

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We studied the relationship of the structural fibers and its papers with a several synthetic or semisynthetic fibers (i.e. Nylon, Vinylon, Polyester, Polyacryl, Rayon).
The results are followed;
1. The fiber strength in the synthetic fiber papers is not so re-appearant to hand-sheets as a general presumption.
2. We founded that the properties of the structural fibers are important whether they are able to, make paper with a good formation than effects on the strength of their fibers.
3. For example, Vinylon, Nylon and Rayon fibers have better suitabilities to paper-making than Polyacryl and Polyester fibres. Accordingly, the former shows more stronger than the latter.
4. However, the stiffness factor of the synthetic papers was proportional to the Young's modulus of the structural fiber in spite of qualities of the sheet formation.

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Studies on the Aging Test of M-F Acid Colloid and its Application

Sadatomo Maruta, Kumeo Yamamoto, Hiroshi Watabe

1961 Volume 15 Issue 12 Pages 797-802
Published: December 20, 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.797

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Paper chromatography (capillary analysis) is used in a simplified technique for the determination of aging degree of M-F acid colloid.
A development time of 60 minutes usually is adequate. The resin spot is made visible on the paper strip by treatment with 2.0%alum solution, followed by curing and staining with acid dye.
R_f=Distance from origin to resin front (cm) /Distance from origin to water front (cm)
R_fvalue is changed with aging time, but Rf becomes to equilibrium after about 3 hours and its value is 0.50-0.55 M·F acid colloid (R_f≥0.50) imports a high degree of wet-strength to paper.

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Study on Neutral Sulphite CGP

Tosaku Ohno

1961 Volume 15 Issue 12 Pages 803-815
Published: December 20, 1961
Released on J-STAGE: February 10, 2010

DOIhttps://doi.org/10.2524/jtappij.15.803

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Using Japanese birch, alder and oak, respectively, neutral sulphite CGP pulping was conducted to evaluate the effects of wood species, pulp yields, cooking conditions, refining and bleachina on the properties of CGP. The major results were as follows :
(1) Wood species had great influence on the properties of CGP. Under the same conditions, the pulp made from birch was stronger and brighter than the pulp from alder, and the pulp from oak which was dense and dark was poorest in strength and unbleached brightness. The opacity of bleached oak CGP treated by hypochlorite was lower than that of unbleached alder or birch CGP, when their brightmess was the same.
(2) At the same freeness, the strengths (e.g. breaking length) of pulps were closely related with yields and other properties of pulps. Each correlation was found to be approximately linear regardless of cooking variables. With increasing breaking length, yield, unbleached brightness and opacity decreased and sheet dencity, oil penetration and wet web strength increased. In case of oak CGP, bleach requirement increased and the opacity of bleached pulp decreased at the same brightness.
(3) Lowering the freeness of pulps, the strength developed and the opacity increased in case of alder CGP having yields above 83%, and decreased in case of the lower yields pulp. At the same breaking length, the pulps of higher yield and lower freeness were superior in brightness and opacity to those of lower yield and higher freeness.
(4) Bleaching developed the strength and increased the sheet density.
(5) The effects of several cooking variables on the cooking rate were discussed.

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Erratum to : Relations between Hemieelluloses and Physical Properties of Various Bleached Sulphite Pulps

1961 Volume 15 Issue 12 Pages 815a
Published: 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.12_815a

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Erratum

1961 Volume 15 Issue 12 Pages 815b
Published: 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.12_815b

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Erratum

1961 Volume 15 Issue 12 Pages 815c
Published: 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.12_815c

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Erratum to : Effect of Hemicelluloses on the Difference of Papermaking Properties between Sulfite and Sulfate Pulps.

1961 Volume 15 Issue 12 Pages 815d
Published: 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.12_815d

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Erratum

1961 Volume 15 Issue 12 Pages 815e
Published: 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.12_815e

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Erratum to : Effect of Hemicelluloses on Papermaking Properties of Bisulfite and Bisulfite-soda Pulps

1961 Volume 15 Issue 12 Pages 815f
Published: 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.12_815f

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Erratum

1961 Volume 15 Issue 12 Pages 815g
Published: 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.12_815g

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Study on Japanese Papar

(Part II) Change of Viscosity in Paper-making Liquid

Haruji Kato

1961 Volume 15 Issue 12 Pages 816-818
Published: December 20, 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.816

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We studied viscosity of Japanese paper tubs separately Kozo-tub, wood pulp-mixing tub, Gampi tub, extending over two seasons from summer to winter.
Viscosity becomes generally less in summer, then in winter.
Viscus liquid made from Hydrangea Paniculta for size changes its viscosity little by difference of temperature.
Viscosity is lowered down by stirring and much more effects is given on “ Abelmoschus Manihot Medic ” than on “ Hydrangea Paniculta ”.

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[title in Japanese]

[in Japanese]

1961 Volume 15 Issue 12 Pages 819-823
Published: December 20, 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.819

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[title in Japanese]

[in Japanese]

1961 Volume 15 Issue 12 Pages 823-825
Published: December 20, 1961
Released on J-STAGE: February 10, 2010

DOIhttps://doi.org/10.2524/jtappij.15.823

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Bauer Centri-cleaner

[in Japanese]

1961 Volume 15 Issue 12 Pages 826-830
Published: December 20, 1961
Released on J-STAGE: November 17, 2009

DOIhttps://doi.org/10.2524/jtappij.15.826

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