JAPAN TAPPI JOURNAL

[title in Japanese]

[in Japanese]

1968 Volume 22 Issue 5 Pages 233-237
Published: May 01, 1968
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.22.5_233

JOURNAL FREE ACCESS

Download PDF (983K)
[title in Japanese]

[in Japanese]

1968 Volume 22 Issue 5 Pages 238-244
Published: May 01, 1968
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.22.5_238

JOURNAL FREE ACCESS

Download PDF (1216K)
Changes of Strength Properties of Wood Pulp with Cellulase Treatment

I. Changes of Strength Properties of High α-sulfite Pulp

Kenichiro Arai, Yoshitaka Ogiwara

1968 Volume 22 Issue 5 Pages 245-252
Published: May 01, 1968
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.22.5_245

JOURNAL FREE ACCESS

Show abstractHide abstract

High α-sulfite pulp was hydrolyzed with powdered cellulase, and the changes of paper strength and some variables assumed to affect the strength were studied.
Tensile strength increased initially with the time of cellulase treatment and it showed aa maximum value. The maximum became considerably higher with beating degree of the pulp.
Tear strength decreased with the time of cellulase treatment. However, in the case of beatenn pulps, the smaller decrease in tear strength was observed as compared to that of unbeaten pulp with cellulase treatment.
When the beaten pulp with beating degree 37°SR was treated with cellulase, the maximum breaking length was about 75% higher than that obtained with beating, whereas the tear factor was almost unchanged.
The changes of characteristics including viscosity-average DP, number-average fiber length, WRV, pentosan content, fiber length distribution, fine fiber content and specific volume of paper web were studied to investigate their influence on the paper strength.
It was concluded that these changes in tensile and tear strength might be interpreted by the fact that only a part of pulp fibers was hydrolyzed with cellulase treatment and a number of fibers were formed which, with regard to interfiber bonding, played an important role particularly in such materials as the high α-sulfite pulp which was less swellable.

View full abstract

Download PDF (1439K)
Graft Copolymerization of 2-Methyl-N-vinylimidazole onto Polyethyl Acrylate

(Studies on the Water-Soluble Polymers XVIII)

Seishi Machida, Nanao Watanabe

1968 Volume 22 Issue 5 Pages 253-257
Published: May 01, 1968
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.22.5_253

JOURNAL FREE ACCESS

Show abstractHide abstract

Graft copolymerization of 2-methyl-N-vinylimidazole onto polyethyl acrylate was studied.
The reaction was carried out in the dimethyl formamide solution under nitrogen atmosphere at 7078°C for two hours and azobisisobutylonitrile was used as an initiator.
A method of separation of the graft copolymer, polyethyl acrylate and poly-2-methyl-N- vinylimidazole was investigated. Each polymer was separated almost quantitatively.
The structure of the graft copolymer was confirmed by infrared absorption spectrum. Solubility of the graft copolymer was found to be similar to that of poly-2-methyl-N- vinylimidazole that is soluble only in polar solvents. Viscosity of the graft copolymer in dimethyl formamide solution was estimated and the reduced viscosity curve showed the character of polyelectrolyte.
It was found that the grafting efficiency is about 26% in the ordinary conditions and the value decreases with the increasing of the ratio of 2-methyl-N-vinylimidazole to polyethyl acrylate in the initial reaction mixture.

View full abstract

Download PDF (1114K)
Studies on Peracid Cooking (2)

Influences of Chip Dimension and pH of Cooking Liquor

Isao Shimada, Tamio Kondo

1968 Volume 22 Issue 5 Pages 258-264
Published: May 01, 1968
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.22.5_258

JOURNAL FREE ACCESS

Show abstractHide abstract

Peracetic acid has now been evaluated as one of superior delignifying and bleaching agents. In the previous paper we reported the peracid pulping data obtained from the preliminary digestion experiments using materials supplied in the form of wood meal and shavings. This investigation constitutes an attempt to determine which cooking condition is responsible for obtaining of the better pulp characteristics through the peracid digestion. The results show that size of the wood chip, namely its thickness, is a dominant factor of some cooking variables. So two types of pretreatment for chip penetration are tested, except in the case where a series of digestion using a few pH of cooking liquor is carried out. Some advantages obtained from the peracid cooking are more than counterbalanced by the higher cost of the cooking liquor dosage required. In this work some other remarks on peracid-cooking pulp are reported also.

View full abstract

Download PDF (1669K)
[title in Japanese]

[in Japanese], [in Japanese]

1968 Volume 22 Issue 5 Pages 265-271
Published: May 01, 1968
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.22.5_265

JOURNAL FREE ACCESS

Download PDF (1248K)
[title in Japanese]

[in Japanese], [in Japanese]

1968 Volume 22 Issue 5 Pages 272-278
Published: May 01, 1968
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.22.5_272

JOURNAL FREE ACCESS

Download PDF (1422K)
[title in Japanese]

[in Japanese]

1968 Volume 22 Issue 5 Pages 279-284
Published: May 01, 1968
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.22.5_279

JOURNAL FREE ACCESS

Download PDF (1097K)
[title in Japanese]

[in Japanese]

1968 Volume 22 Issue 5 Pages 285-290
Published: May 01, 1968
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.22.5_285

JOURNAL FREE ACCESS

Download PDF (4744K)

Register with J-STAGE for free!