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29 巻, 9 号
選択された号の論文の11件中1～11を表示しています
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1975 年 29 巻 9 号 p. 52
発行日: 1975/09/01
公開日: 2009/11/10
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本邦洋紙草創期を開拓した学校出の技術者達 (IV)西 済1975 年 29 巻 9 号 p. 459-463
発行日: 1975/09/01
公開日: 2009/11/10
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及川 五郎1975 年 29 巻 9 号 p. 464-467
発行日: 1975/09/01
公開日: 2010/01/22
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高清水 博1975 年 29 巻 9 号 p. 468-474
発行日: 1975/09/01
公開日: 2009/11/10
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森 喜久造1975 年 29 巻 9 号 p. 475-484
発行日: 1975/09/01
公開日: 2009/11/10
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本間 忠一, 大森 直孝1975 年 29 巻 9 号 p. 485-487
発行日: 1975/09/01
公開日: 2009/11/10
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1975 年 29 巻 9 号 p. 488
発行日: 1975/09/01
公開日: 2009/11/10
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1975 年 29 巻 9 号 p. 489-491
発行日: 1975/09/01
公開日: 2009/11/10
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山内 龍男, 村上 浩二, 今村 力造1975 年 29 巻 9 号 p. 492-497
発行日: 1975/09/01
公開日: 2009/11/10
ジャーナル フリーAn attempt to approach better understanding on porous structure of paper, particularly on interconnected fiber to fiber channels occupied large part of total pore volume of paper, was made by applying the conception of porous model in packings of uniform spheres to the penetration and retraction curves obtained by mercury porosimetry. The experimental data for a series of handsheets prepared from a bleached softwood kraft pulp with variety of wet pressure and beating degree are presented.
The mercury penetration into the channels between fibers and the retraction from those are completed within narrow pressure range and further, in handsheets of unbeaten fibers, almost all mercury penetrated are retracted at the reduced pressure. It may be reasonably considered from these behavior of mercury on handsheets from unbeaten or lightly beaten fibers that the channels between fibers having complicated structures in practic are similar to the interconnected pore-space of packed spheres. However, the tendency is ound that the total mercury retraction volume expressed as the percentage to the total mercury penetration volume decreases with decreasing the total penetration volume. These facts seem to indicate that the pores occupied by mercury after the reduced pressure are formed within the sheets as the effects of wet pressing or beating operations.
The penetration and retraction curves concretely represent the actual change in porous structure of handsheets. In addition to the tendency mentioned above, the apparent breakthrough pressure obtained form penetration curves and the apparent withdrawal pressure from retraction curves increase meaningfully with decreasing the total volume of mercury penetrated.抄録全体を表示PDF形式でダウンロード (1052K) -
マングローブ材パルプのビスコース化反応性について甲斐 惟幸, 後藤 孝, 山路 敬三, 森上 正三1975 年 29 巻 9 号 p. 498-504
発行日: 1975/09/01
公開日: 2009/11/10
ジャーナル フリーThe filterability of viscose is one of the most important characteristics of dissolving pulp. In this paper, the filterability of viscose prepared from mangrove dissolving pulp (MDP) was compared with that from hardwood dissolving pulp (LDP) or softwood dissolving pulp (NDP). The filterability of the viscose prepared from MDP with the xanthation method by use of the emulsified carbon bisulphide reagent, was more excellent than that from LDP and was comparable with that from NDP. In industrial viscose process, sodium cellulose prepared from MDP showed higher compressibility than that from LDP. Press ratio suitable to viscose process for the MDP was found to be 2.30±0.05 to the oven dry pulp. This range was very narrow as compared with those in other dissolving pulps. The quantities of sodium hydroxide in steeping and carbon bisulphide necessary for xanthation of the MDP were nearly equal for the LDP and the NDP. The filterability of the viscose prepared from MDP at the suitable conditions was better than that from LDP, whereas it was inferior to that from NDP and nearly equal to that from LMDP (L50 : M50). The optical microscopic observation of the filtered residue of viscose from MDP revealed that there existed many free fibers compared with other dissolving pulps, forming the min obstacles to filtration. As we considered that the strong pressing of sodium cellulose from MDP caused heterogeneities in shredding, the press ratio was regulated by varying the blending ratio of LDP or NDP to MDP. And with this method, the filterability for the dissolving pulp of L25 : M75 showed the minimum KW and the suitable press factor was obtained at the press ratio of 2.42.6. The filterability for the dissolving pulp of N30 : M70 showed the value as much as 20% higher KW than that for the pure NDP, in which case the suitable press factor was abtained at the press ratio of 2.6. By blending 2530% of LDP or NDP to MDP, the shredding of sodium cellulose from MDP was improved and the filterability of viscose was remarkably made better.抄録全体を表示PDF形式でダウンロード (1131K) -
〓皮 (青檀) 繊維の形態について前松 陸郎, 曽我部 隆紀1975 年 29 巻 9 号 p. 505-509
発行日: 1975/09/01
公開日: 2010/01/22
ジャーナル フリーThe bast fibers from the shoots of “Tan” (Pteroceltic Tatarinowii, Maxim. Ching-tan in China) have been used as one of the most important raw materials for Chinese handmade paper.
The morphology and the structure of the bast fibers of “Tan” were researched under the light microscope as shown in Fig. 13.
Staining reactions with various stains were observed as follows;
Stain Colors Developed Graff “C” Stain Yellow......yellowish......grayish red purple Herzberg Stain Grayish red drab to yellowish red purple Selleger Stain Light purple Wilson Stain Light purple Phloroglucinol None
The structure of (Tan, Mitsumata, Gampi, manila hemp) swollen by using various swelling agents (17.5% caustic solution, Schweitzer's reagent, 84.5% phosphoric acid) have been given as shown in Fig. 413.抄録全体を表示PDF形式でダウンロード (4936K)
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