紙パ技協誌

正誤

1966 年 20 巻 5 号 p. 67
発行日: 1966年
公開日: 2010/01/25

DOIhttps://doi.org/10.2524/jtappij.20.5_67

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紙とデンプン接着剤

森本智

1966 年 20 巻 5 号 p. 231-235
発行日: 1966/05/05
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.20.5_231

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製紙工業におけるスライムコントロール方法の進歩について

細見正明

1966 年 20 巻 5 号 p. 236-244
発行日: 1966/05/05
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.20.5_236

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製紙用サイズ剤について

小杉堯夫

1966 年 20 巻 5 号 p. 245-251
発行日: 1966/05/05
公開日: 2010/01/25

DOIhttps://doi.org/10.2524/jtappij.20.5_245

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紙力増強剤について

伊東五郎

1966 年 20 巻 5 号 p. 252-256
発行日: 1966/05/05
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.20.5_252

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木材パルプの単繊維強度

臼田誠人, 池田成生, ナバロハイメ・R, 中野準三, 右田伸彦

1966 年 20 巻 5 号 p. 257-264
発行日: 1966/05/05
公開日: 2010/05/07

DOIhttps://doi.org/10.2524/jtappij.20.5_257

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The individual fiber strength were studied on sulfite pulp and kraft pulp prepared separately from pine early- and late-woods by varing cooking time. Pulp yield varied from 67% to 42% according to cooking time. The permanganate number of pulps, lateral order distribution and DP of cellulose were determined, and their effects on the strength of pulp were discussed.
The fiber strength of sulfite pulp and kraft pulp decrease with decreasing yield (sulfite pulp : 32-14 g/fiber, kraft pulp : 34-21 g/fiber). Comparing the fiber strength of these two pulps at the same level of yield, kraft pulp gives a considerably high strength. Neither DP nor lateral order distribution of cellulose can account for the cause of the higher fiber strength of kraft pulp. Leopold (1961) reported that xylan in wood fiber is located between fibrils, and contributes to the fiber strength by binding the fibrils. The fiber strength of kraft pulp rich in xylan, therefore, is expected to drop by the alkali extraction mo-re remarkably than sulfite pulp. However, on extraction of hemicellulose, the fiber strength of sulfite pulp decreased similarly as kraft pulp. In general, the degree of decrease in fiber strength diminishes as lowering pulp yield.
Forgacs (1961) pointed out that the fiber would be broken at “node”, i.e. local defects in sulfite fiber. Microscopical observation, however, revealed that the node exists in kraft pulp as well as in sulfite pulp (ref. to photo 3), and in many cases fiber was broken at this position on tensile test. Therefore, individual fiber strength shows the strength of locally damaged portion of wood fiber. In order to clarify the difference of fiber strength between sulfite pulp and kraft pulp, it is necessary to know the physical properties of the damaged portion.
The decrease in fiber strength on alkali extraction seems to be attributed to the expansion of this defect by the concentration of stress resulted from strong swelling. This assumption was ascertained by the results obtained from the determination of fiber strength of nitrated pulps.

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Stora法における蒸解排液中の全SO₂の定量について

菅泉実, 竹谷克巳, 米田豊

1966 年 20 巻 5 号 p. 265-273
発行日: 1966/05/05
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.20.5_265

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On Stora process, Na₂SO₃ and NaHSO₃ are used for the first stage as cooking chemicals.
The cost of the chemicals is relatively higher than that of ordinary Ca-SP process. Therefore re-used system and recovery system must be adopted in this process.
In the equilibrium state, the ratio of Na₂SO₃ to NaHSO₃ in the solution used is determined by total SO₂ and pH. However, the total SO₂ value in the waste liquor is affected by the other reducing substances, therefore, usual iodometric titration cannot be employed in this case.
To the analysis of the total SO₂ in Stora waste liquor, the method for Na₂S, Na₂SO₃ and Na₂S₂O₃ in KP black liquor was tried to apply. For this purpose, the basis of TAPPI standard T625m-48 have been investigated.
From the above investigation, the following new method was employed for the analysis of Na₂SO₃ and NaHSO₃ in Stora waste liquor.
At the first, the value of total reducing substances (A) was determined by potentiometric titration using iodine without usual removal of organic precipitate formed by addition of ZnCO₃.
Meanwhile, for the determination of reducing substances except Na₂SO₃ and NaHSO₃, excess amount of formalin was added to the waste liquor for making the adduct of Na₂SO₃ and NaHSO₃. After the treatment with formalin, the value of reducing substances (B) was determined potentiometrically using iodine.
From the difference between A and B, the true amount of total SO₂ was determined easily.
Furthermore, it has been certified that the end point of the usual iodometric titration identified with potentiometrical method.
According to the result of actual routine work, it is concluded that new iodometric method is more useful and accurate on the determination of effective chemicals in waste liquor.

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製紙用化学薬品について (其の2)

奥田昌信

1966 年 20 巻 5 号 p. 275-282,290
発行日: 1966/05/05
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.20.5_275

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試作した自己反応型耐水性澱粉の紙コーテング用顔料バインダーとしての検討

岡根正明, 恒松雄八郎

1966 年 20 巻 5 号 p. 283-285
発行日: 1966/05/05
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.20.5_283

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最も新しく開発された耐水性澱粉系バインダー “Nylgum A-220”

A. Harsveldt

1966 年 20 巻 5 号 p. 286-290
発行日: 1966/05/05
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.20.5_286

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