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Volume 41, Issue 9
Displaying 1-8 of 8 articles from this issue
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Jiro Kawake1987 Volume 41 Issue 9 Pages 765-771
Published: September 01, 1987
Released on J-STAGE: October 27, 2010
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Shigemi Ohno1987 Volume 41 Issue 9 Pages 772-778
Published: September 01, 1987
Released on J-STAGE: October 27, 2010
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Hidehiko Yamazaki1987 Volume 41 Issue 9 Pages 779-798
Published: September 01, 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSRecently, computer-oriented statistical approaches for data analysis as are called Multivariate Data Analysis and Quantification Theory are paid attention to as methods for prediction of unknown data and for abstraction of complicated phenomena in various kinds of fields like psychology, economics, chemistry, medicine, etc.
The methods can be classified into two groups as follows.
(1) Methods to describe a given property using some other properties, which can be employed to predict unknown data.
(2) Methods to summarize data.
In this article the application of these methods to studies on paper is described. Included are quantification theory type 1, 3 and 4, multiple regression analysis, time series analysis, principal component analysis, factor analysis, multidimensional scaling.View full abstractDownload PDF (3730K) -
Masayoshi Suguri1987 Volume 41 Issue 9 Pages 799-804
Published: September 01, 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSHigh performance rolls made of special plastics has been developed chiefly as papermaking calender rolls, particularly as those for soft calenders and super calenders. Kinyosha which started production of plastic rolls for use with magnetic tape calenders in 1972, has produced a total of some 4, 000 rolls for our client up to the present.
Utilizing the knowhow thus gained, the Company developed plastic rolls for papermaking calenders, whose production was started in 1981.
Kinyo calender rolls are used chiefly for magnetic tapes (not-for-sale items), papermaking and fabrics. The rolls can be grouped into 5 different series depending on the types of plastics used, of which, only plastic rolls for papermaking will be discussed here.View full abstractDownload PDF (1484K) -
Junzo Nakano, Atsushi Ishizu, Gyosuke Meshitsuka, Masahiro Samejima, A ...1987 Volume 41 Issue 9 Pages 805-820
Published: September 01, 1987
Released on J-STAGE: October 27, 2010
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Hiroki Nanko, Shun-ichiro Mukoyoshi, Junji Ohsawa1987 Volume 41 Issue 9 Pages 823-830
Published: September 01, 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSVessel picking troubles of printing papers made from tropical hardwood pulps can be easily prevented by covering vessel elements with several fibers. This paper deals with the effect of covering layer on vessel picking.
Using multi-layered handsheet forming device (JPRI Multi-head) two-layered sheets consisted of a thin surface layer and a thick bottom layer were prepared. Non-vessel picking pulps such as Buna (beech) or softwood BKP were used for the surface layer. Lauan BKP which contains large vessel elements was used for the bottom layer. Vessel pick tendency was evaluated by IGT printing test.
The extremely thin surface layer of 2g/m2 of Buna BKP can effectively prevent picking, where single vessel element is covered only by 4 to 7 fibers. Softwood BKP also has the same effect as Buna BKP. This means that vessel pick phenomenon is controlled by small amount of fibers covering vessels. These fibers play the roll of fixing vessels on the sheet surface and of preventing initial lifting of vessels which leads to complete destruction of vessel-to-under layer bonding.
Stratified sheet formation with single hydraulic headbox appears to be the most promising technology for vessel pick prevention, because it can perfectly prevent vessel picking without limitation of pulp woods used for the mid layer of the sheet.View full abstractDownload PDF (3438K) -
-2-Boiling Point Rise and Vaporization Rate of High Solids Black LiquorHaruo Tsukatnoto, Hiroyuki Tadokoro, Michihiro Nakura1987 Volume 41 Issue 9 Pages 831-840
Published: September 01, 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSComparison of specific gravity, boiling point rise (BPR) and vaporization rate between high solids (70-90%) AP and KP black liquor of softwoods (Douglas fir from North America, Domestic red pine) and hardwoods (Eucalyptus from Tasmania, Domestic oak) were carried out. Specific gravity of black liquor is temperature and solids concentration dependent and it made very little difference except for that of Eucalyptus AP and KP.
Boiling point rise of AP and KP black liquor of softwoods and hardwoods depends upon solids concentration and residual alkali content whether that is AP or KP black liquor of softwoods and hardwoods. AP black liquor of softwoods has higher residual alkali content and higher BPR than KP black liquor, which is caused by higher active alkali charge by a factor of about We found very little difference between AP black liquor of hardwoods and KP black liquor of softwoods & hardwoods. Vaporization rate of AP black liquor of softwoods and hardwoods is nearly equal to or a little lower than that of KP black liquor.View full abstractDownload PDF (1538K) -
1987 Volume 41 Issue 9 Pages 841-842
Published: September 01, 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (417K)
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