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Volume 34, Issue 4
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[in Japanese]1980 Volume 34 Issue 4 Pages 63-64
Published: April 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (240K) -
1980 Volume 34 Issue 4 Pages 80
Published: April 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (167K) -
1980 Volume 34 Issue 4 Pages 82
Published: 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (84K) -
Junzo Nakano1980 Volume 34 Issue 4 Pages 265-275
Published: April 01, 1980
Released on J-STAGE: November 16, 2009
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Shuji Hosoya1980 Volume 34 Issue 4 Pages 276-282
Published: April 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSIn the bleaching of high yield pulp, it is necessary to degrade selectively the chromophoric group in pulp components, lignin, carbohydrate and extractives. The word of “selective” used here means that there is no degradation or dissolution of colorless materials during bleaching. Numerous papers have been published regarding the mechanism of high yield pulp bleaching, but many important problems have yet to be dealt with.
The objective of this review is to clarify the reactions of lignin during the course of hydrogen peroxide and dithionite bleaching from the standpoint of lignin chemistry. Changes in the number of functional groups in lignin preparations were measured after hydrogen peroxide and dithionite bleaching. Lignin model compounds were reacted with these bleaching reagents and the reaction mechanism were discussed.View full abstractDownload PDF (725K) -
E. W. Grandmaison, J. Marois1980 Volume 34 Issue 4 Pages 283-289
Published: April 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSAn investigation of the total reduced sulphur (TRS) emissions from a fluid bed calciner has indicated that the only TRS component originating at this source was H2S and this emission emanated from the mud drying system. The principal variable affecting the H2S emission was the soluble sulphide in the lime mud feed to the cage mill.
Methods for controlling the sulphide concentration in lime mud have been evaluated. The filtration properties of lime mud were investigated with the objective of maximizing the soluble sulphide removal from the filter cake feed to the calciner. Techniques for oxidizing soluble sulphide in lime mud were also evaluated. The results of these tests demonstrated the technical and economic feasibility for aeration in sparged vessels and aeration with high pressure oxygen.View full abstractDownload PDF (3426K) -
Oe Mill, Marusumi Paper Co., LtdMarusumi Paper Co. Ltd.1980 Volume 34 Issue 4 Pages 290-298
Published: April 01, 1980
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSThe city of Kawanoe where the Oe Mill is located, has been historically developed as a key station of ocean trade, between Takamatsu and Matuyama in Shikoku.
That location is very suited for traffic convenience having easy access to Osaka, Chugoku, and Kyushu area.
The company was established in 1920, and we are now operating three paper mills of Kawanoe, Kinsei and Oe.
We are introducing here the profile of our new Oe Mill which was started up on stream in December 1979 with most modernized equipments for producing newsprint, so that the future potentiality could hopefully be expected as our sea-front plant.
The all manufacturing facilities are equipped on land of 300, 000 square meters and approximately one hundred and twenty employees are working for daily production.
The producing capacity of pulp and paper are as follows.
Pulp TMP 450 T/D
Paper Newsprint 550 T/DView full abstractDownload PDF (14197K) -
Hidehiko Yamazaki, Toshio Kurita, Kazumasa Miyazaki, Hidehisa Yokomizo ...1980 Volume 34 Issue 4 Pages 299-315
Published: April 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSSeveral fibers from Musa species grown and extracted in the Philippines (P) and Ecuador (E), that are cavendishii (from P and E), saba (Philippine local name, sapientum P), canton fiber (natural hybrid of textilis × balbisiana from P), gros Michel (from E), alinsanay (Philippine local name, from P), were investigated into their pulping characteristics and paper-making properties, and compared with those of abaca fiber.
From the results of this investigation, it was found that :
(1) The alkaline sulfite method, which is suitable for abaca, is applicable to the fibers from other Musa species.
(2) Pulp brightness, crude yield and screened yield increase as parenchyma content and 1% NaOH extracts in the fiber decrease.
(3) Fiber length and width distribution curves show that the samples can be separated into practically two groups. Banana fibers have a feature of grouping into one block. Every pulp contains brick shape cells like stegmata in abaca pulp.
(4) On the pulps other than saba and cavendishii (P), drainage time develops pretty fast as beating proceeds. Collapse of parenchyma seems to have much influence on the increase of drainage time.
(5) Pulp fibers of saba, cavendishii (P), gros Michel and abaca are apt to form fiber lumps caused by their entanglement.
(6) All pulps show equal or rather high strength values than abaca in the beating range of up to 100 seconds of drainage time. While, in the lower drainage time range, which is suitable for good sheet formation, abaca and cavendishii (P) show higher strength values.
(7) For strength development, addition of parenchyma to unbeaten fiber is effective, however, its addition to beaten fiber has negative effect.View full abstractDownload PDF (13847K) -
The Effect of Beating on the Structure of Fibre Walls and Hand-sheets from Non-wood FibresHiroshi Hara, Raysabro Oye1980 Volume 34 Issue 4 Pages 316-321
Published: April 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSFibres of flax waste and kenaf bark were studied on their morphological changes during pulping and beating by means of scanning electron microscopy and specific surface measurement. Following results were obtained.
1) Flax fibres were frozen smashed in liquid nitrogen and gently delignified with chloriteacetic acid solutions. Thus middle lamellae and the primary walls were removed and disappeared, then the secondary walls with fibrils of about 10° inclined S helics were exposed. These fibrils were split into fibril bundles of one to several μm width parallel to the fibrilar angle. Moreover, the secondary walls were delaminated easily to separate.
2) Kenaf fibres, which were treated as flax fibres, exposed the secondary walls with fibrils of Z helics of about 10°. However, no fibril bundle was observed. This can be considered that a cohesion force between fibrils of kenaf fibres is stronger than that of flax fibres.
3) At the same freeness level, specific surface area of handsheet from flax fibres was larger than that of kenaf. This is because flax fibre is more subjected to the external fibrillation, so fibril bundles and fibrils are easily separated from a parent fibre to form a closed sheet structure.
On the other hand, kenaf fibres are least changed macroscopically during pulping and beating, so fibres are the main geometrical component of the sheet strcture.View full abstractDownload PDF (5766K) -
Takeshi Kobayashi, Jun Hosokawa, Takamasa Kubo, Isao Akamatsu, Yutaka ...1980 Volume 34 Issue 4 Pages 322-326
Published: April 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSAlkaline soaking after ozone treatment was studied for mechanical pulp in order to improve sheet strengths of ozone treated pulp with yield of 85% or more.
The results obtained are summarized as follows :
Alkaline soaking of ozone treated pulp increased tear factor and breaking strengthe to 1.2 and 1.5 times higher respectively than those of non-soaked pulp.
Alkaline soaking reduced brightness, freeness and slightly pentosan content in the pulp. On the other hand, it increased sheet density, K value and carboxyl group content.View full abstractDownload PDF (463K)
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