JAPAN TAPPI JOURNAL

Pulp and Paper Industry in Information Oriented Era

The Coming Technical Problems

Yusaku Fukuda

1986 Volume 40 Issue 3 Pages 227-230
Published: March 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.227

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Reports on 1985 Japan-Canada Technology Exchange

1985 Pulp and Paper Technology Conference and Mill Tour

Overseas Technology Exchange Committee, Shuji Yamamoto

1986 Volume 40 Issue 3 Pages 231-253
Published: March 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.231

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As the 7th Japan Canada Technology Exchange, a technical conference and a mill tour were organized in October 1985. Tojo Kaikan near Hanzomon of Imperial Palace was the site of 1985 Pulp and Paper Technology Conference, which was attended by nearly 200 peoples including 36 peoples from overseas. The conference was featured with two keynote addresses derivered by Mr. S. Yamamoto of the Industrial Bank of Japan, and Mr. J. H. Whalen of CIP Inc. 19 technical papers in the area of pulping, papermaking and paper properties were also presented. Panel discussion on the usage of recycled fibers brought considerable attention from attendance. One week tour of 5 pulp and paper mills in western part of Japan was participated by more than 30 peroples accompanied by many wives. This is the brief report on the event of conference and mill tour.

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About the Instrumentation of Paper Sorting Process

Tuneya Sato

1986 Volume 40 Issue 3 Pages 254-261
Published: March 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.254

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Interview with Sulzer Escher Wyss

The Recent Papermaking Technology

J. TAPPI Editorial Committee

1986 Volume 40 Issue 3 Pages 262-273
Published: March 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.262

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Microtopography of paper surface. II Surface roughness of printing paper

Haruki Wakebe, Hiroshi Hara, Raysabro Oye

1986 Volume 40 Issue 3 Pages 275-283
Published: March 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.275

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To characterize microtopography of paper surface, roughness testing was investigated by means of three different smoothness testers of air-leak, optical contact and stylus types.
Applying these testers, surface roughness of papers could be studied from different points of view. For instance, the surface of handsheets on the plate side had many pores at fiber crossings and it was macroscopically smoother. Handsheets from hardwood pulp showed finely rugged surfaces compared to those from softwood pulp. No large pore was found on the surface of an India paper due to filler loading and it was more finely even compared to the anti-plate side of handsheets. The surface of a coated paper was affected by roughness of the base stock and it still exhibited high smoothness.
It was understood that the air-leak type smoothness tester gave ruggedness of paper surface as a total volume and the optical contact type showed it as a distribution of depth in ruggedness. The three dimensional roughness was measured by scanning the stylus in x and y directions by the stylus type smoothness tester.

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The fundamental investigation of kraft cooking from the viewpoint of chemical engineering

Part 2 The stoichiometric analysis of kraft cooking reaction

Miyuki Kojima, Junzo Aoi, Hiroshi Tsuchiya, Takeo Nagasawa

1986 Volume 40 Issue 3 Pages 284-294
Published: March 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.284

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This report concerns the experimental results to clarify the stoichiometry between the consumption of alkali or sulfur, and the dissolution of wood components (carbohydrate, lignin, etc.) during alkali cooking of two wood species, Buna (Fagus crenata Blume) and Akamatsu (Pinus densi flora S. et Z.).
From the results, the different manner of the carbohydrate dissolution was observed between kraft and soda cooking of Buna, but no difference in the case of Akamatsu. The most part of lignin in both woods was dissolved on the bulk delignification stage. NaOH was guantitatively consumed by dissolution of carbohydrate, but no Na₂S was consumed by it. A small part of Na₂S was consumed during the delignification reaction.

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Evaluation and Observation of Latex Distribution in Coated Paper by means of EPMA

(2) Effects of basis weight variation and latex distribution on trapping during unit type offset printing

Masahiro Kohno, Tadahira Hamada

1986 Volume 40 Issue 3 Pages 295-303
Published: March 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.295

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When coated papers are provided to multi color unit type offset printing, uneven transfer between the ink film of cyan and that of magenta occurs sometimes resulting the ink mottle on printed surface.
In this paper, the correlation between the local variation of basis weight in coated paper and that of magenta ink density on the printed surface and also, the relation between latex distribution and trapping were studied. Latex distribution was determined by using EPMA technique presented in the previous report.
The results were summarized as follows:
(1) In order to measure the local variation of basis weight in the specimen, contact β-ray method was employed. The variation of the basis weight correspond to that of the optical density in the X-ray film.
It was recognized that the pattern of basis weight variation corresponded to that of magenta ink density. From the results, it was assumed that the trapping trouble was dependent upon the coating weight variation which had been caused by the local variation of basis weight in base paper under various coating conditions.
(2) In order to correspond to the size and pattern of ink mottle on the printed surface, continuous measurement of Os X-ray intensity with EDS was carried out by counting the unit area of 1×1 mm² from 30 to 50 spots on 0s0₄ tagged coated layer surface. Color distribution maps of Os were depicted indicating the levels of OsLα X-ray intensities in 12 colors (2600-4700 counts).
It was shown by the color distribution maps of Os that the specimen which caused good trapping had considerably uniform distribution of latex but that with poor trapping had ununiform distribution of latex corresponding to the size and shape of ink mottle.
(3) The similar results were also obtaind by the color distribution map of Os measured with CMA (Computer aided X-ray microanalyzer).
(4) The Os distribution map of cross section measured with CMA indicated that the specimen with good trapping had less migration of latex into base sheet than that with poor trapping.
(5) From the results, it was recognized that the pattern of basis weight variation corresponded to that of latex distribution on the surface and ink mottle originated from poor trapping during unit type offset printing of coated paper was caused by the ununiform distribution of latex occuring at low binder level on the surface.

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[title in Japanese]

1986 Volume 40 Issue 3 Pages 304
Published: March 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.304

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Erratum to : Papermaking Machines of Sumitomo Valmet and Sumitomo Wärtsilä

1986 Volume 40 Issue 3 Pages 322
Published: 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.3_322

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