紙パ技協誌

化学繊維紙の現状と展望

ファイバーベース合成紙の正しい認識のために

小林良生, 前松陸郎

1978 年 32 巻 8 号 p. 443-450
発行日: 1978/08/01
公開日: 2010/01/22

DOIhttps://doi.org/10.2524/jtappij.32.8_443

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工場紹介(1)

王子製紙(株)春日井工場

王子製紙株式会社

1978 年 32 巻 8 号 p. 451-462_1
発行日: 1978/08/01
公開日: 2009/11/10

DOIhttps://doi.org/10.2524/jtappij.32.8_451

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抄紙機ウエットパートの改良, 進歩 (III)

スクリーン, フローボックス, スライスについて

上田末喜

1978 年 32 巻 8 号 p. 463-469
発行日: 1978/08/01
公開日: 2009/11/10

DOIhttps://doi.org/10.2524/jtappij.32.8_463

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パピルス

1978 年 32 巻 8 号 p. 470
発行日: 1978/08/01
公開日: 2009/11/10

DOIhttps://doi.org/10.2524/jtappij.32.8_470

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紙の衝撃引張り破断特性について (第3報)

衝撃引張り速度依存性

木村実, 門屋卓

1978 年 32 巻 8 号 p. 471-475
発行日: 1978/08/01
公開日: 2009/11/10

DOIhttps://doi.org/10.2524/jtappij.32.8_471

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Paper is usually subjected to stress or strain under dynamic conditions concerning its uses. Therefore, it is important to obtain the information of mechanical properties of paper under impact conditions. This paper deals with the impact behavior of paper at different rates of impact elongation.
The summary in this study is as follows.
(1) Time-to-failure of NBKP sheets decreases with increasing rates of impact elongation. Strain-to-failure, however, remains a constant value within the impact velocity range in this study. These results are in agreement with those of static load-elongation tests.
(2) Impulse decreases with increasing rates of impact elongation. The behavior of impulse with impact velocities is similar to that of time-to-failure. On the contrary, energy absorption increases with increasing rates of elongation. This seems to show that the critical velocity by von Kármán exists at higher impact velocity level than that adopted in this study.

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紙のZ方向における圧縮弾性について

大崎茂芳, 藤井良彦

1978 年 32 巻 8 号 p. 476-484
発行日: 1978/08/01
公開日: 2009/11/10

DOIhttps://doi.org/10.2524/jtappij.32.8_476

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The compressive modulus. B' and the compressive viscosity η of a handmade paper were measured for the Z-direction (the direction perpendicular to the surface). The modulus was obtaind by the dynamic and the static methods while the viscosity was obtained by the dynamic method. The value of B' increased from 10⁷ to 10¹⁰ (dyn/cm²) by application of pressure while the value of η from 10⁴ to 10⁷ (poise). It was also found that these values increased with the apparent density of the paper. The water absorbed in the paper also affected on these values.
The structure of the cross section parallel to the Z-direction in the paper was observed by means of the scanning electron microscope in order to clarify the correlation between the structure and the modulus. It was found that B' incrased with the decrease of void fraction which was measured with the electron micrograph.

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SO₂+MgSO₄二成分蒸解法に関する研究

「カラマツ・アカマツからのケミカルパルプ製造と蒸解廃液からのMgSO₄回収」

鈴木勉, 戸坂圀夫, 林治助

1978 年 32 巻 8 号 p. 485-494
発行日: 1978/08/01
公開日: 2010/01/22

DOIhttps://doi.org/10.2524/jtappij.32.8_485

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Larch and red-pine chips, which were composed of sap-and heart wood by equal weight, were cooked in the liquor of 32% SO₂ and 24% MgSO₄ the same cocentration as in the chemical pulping of spruce and it has been examined whether the quality of the pulps is good or not.
The relationship between cooking temperature and time to obtain chemicalpulp from larch or red-pine were 6, 4, and 3 hrs. at the temperatures of 135° to 140°, 150°, and 160°C, respectively.
All these pulps contained the considerable amount of screenings of 10 to 20% by weight based on an ovendry wood, but they were easily defiberated with Disc-refiner.
Screened yield and paper strength of the pulps obtained from larch or red-pine at 135° to 140°C were comparable or superior to those of Mg-base sulfite pulps.
When cookings of these species were carried out with the same temperature-time schedule as in the sulfite, so-called easy-bleaching type, screening yields of pulps became higher and also reject stocks were significantly reduced.
The pulps showed excellent paper strength comparable to KP, and furthermore the yield of fiber stock was superior to that of KP.
The recovery of MgSO₄ as a cooking chemical from waste liquors of softwoods was investigated.
The recovery was not dependent on the type of waste liquor but on the degree of carbonization of waste liquors by evaporation.
The chemicals was completely separated from highly carbonized substance by washing with water.
However, in low degree of carbonization, the two-steps washing with SO₂ solution and water was required for the full separation of the chemical.

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海外技術ニュース

1978 年 32 巻 8 号 p. Preface10-Preface13
発行日: 1978/08/01
公開日: 2009/11/10

DOIhttps://doi.org/10.2524/jtappij.32.8_Preface10

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