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Volume 48, Issue 3
Displaying 1-11 of 11 articles from this issue
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Tadahiro Kondo1994 Volume 48 Issue 3 Pages 405-423
Published: March 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESS -
Sizing mechanism of ASA and rosin systems, and roles of alum and carboxyl groups of pulp in sizing, etc.Akira Isogai1994 Volume 48 Issue 3 Pages 424-436
Published: March 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSPaper sizing is reviewd in terms of sizing and rerention mechansims of alkenylsuccinic anhydrides, rosin-alum systems and saponified alkenylsuccinic acids on the basis of recent publications and our experimental results. Furthermore, roles of alum and carboxyl groups of pulp in wet-end were studied from the aspects of internal sizing and retention of wet-end additives in sheet.View full abstractDownload PDF (7221K) -
Setsuo Toyoshima1994 Volume 48 Issue 3 Pages 437-446
Published: March 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe application of new material sheets have been increasing in various fields recently. These sheets are made by wet-laid or dry-laid paper making processes. New material sheets have high performances derived from the material itself. Also, these sheets are porous, light weight, and have good convertibility and cost merits. Some application examples such as electrical parts, construction meterials, heat resistant materials, composite materials, and electrical conductive materials are shown in this paper.View full abstractDownload PDF (5589K) -
Masaki Takahashi1994 Volume 48 Issue 3 Pages 447-455
Published: March 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe amount of office wastepaper containing electrostatic printing toners is rapidly growing. Conventional washing and flotation processes of deinking are not so effective to reclaiming speck-free pulp. The dispersing process is essential for peeling the undetached toners from pulp.
This paper shows dry method technology to treat toner-printed office wastepaper. Laboratory single-disk refiner was employed to fiberize the toner-printed wastepaper in dry state. Hand made sheets from reclaimed fiber were weakened in mechanical strength, but looked as if it were deinked, because of the toners in hand made sheet being distributed into fine particles.View full abstractDownload PDF (4591K) -
Kiyokazu Sakai, Osamu Tomita, Shinichi Nagata1994 Volume 48 Issue 3 Pages 456-460
Published: March 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSIt is well known that fiber orientation of paper has influence on the anisotropy of mechanical breaking strength and hygroexpansion coefficients. Therefore, the development of on-line measuring system will contribute a lot in improving stability in paper quality as well as paper quality itself, because the on-line measuring system simplifies influence analyses of fiber orientation under varying conditions of a paper machine.
In our laboratory, we have developed methods for measuring the fiber orientation of paper by employing linear dichroism in the near-infrared range. Test results obtained with the off-line device using these methods showed a good correlation with results obtained under other methods, such as Microwave Molecular Orientation Analyzer and Sonic Sheet Tester. In this paper, we report test results and discuss the development of the on-line system under our methods in comparison with the On-line Retardation Measuring System. The On-line Retardation Measuring System is a device that measures the optical anisotropy of polymer film.View full abstractDownload PDF (514K) -
Raysabro Oye1994 Volume 48 Issue 3 Pages 461-466
Published: March 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe 25th EUCEPA Conference was held under the thesis of “Pulp and Paper 2000” in Wien from 4th till 8th October 1993. About 400 attendants participated from 28 countries. Main topics were TCF pulp making including ozone bleaching and utilization of wastepaper from view points of deinking and energy recovery. Programme has been briefed.View full abstractDownload PDF (3014K) -
1994 Volume 48 Issue 3 Pages 467-474
Published: March 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (10945K) -
[in Japanese]1994 Volume 48 Issue 3 Pages 475
Published: March 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (168K) -
Tsutomu Naito, Junji Ohsawa1994 Volume 48 Issue 3 Pages 476-484
Published: March 01, 1994
Released on J-STAGE: February 22, 2010
JOURNAL FREE ACCESSA sensory value of sheet formation for wood-free papers and Xerography papers has been determined quantitatively by the Sheffe's paired comparison method as in a previous paper of this study. This made possible to compare the results on subjective test with physical properties of paper because the sensory value obtained as an “estimated main effect” was not discrete but continuous in contrast to the ranking. The comparison led to the following conclusions :
1. The physical properties such as basis weight, caliper and optical properties showed poor correlations with the subjective evaluation of sheet formation.
2. Most of the sheet formation testers might be able to determine the subjective evaluation of sheet formation.
3. There was a good correlation between sheet formation with a beta radiography and the sensory value. However it should be noted that some paper with the same local mass variation showed a different sensory value, and vice versa.View full abstractDownload PDF (915K) -
Shao-ping Chen, Hiroo Tanaka1994 Volume 48 Issue 3 Pages 485-492
Published: March 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSN-Chlorination of polyacrylamide (PAM, 0.5%) with NaOCl was maximized after 34 h at 5°C and after 1520 min at 25°C. The lower the addition level of NaOCl, the easier the N-chlorination occurred, contrary to those of low molecular amides. This phenomenon was explained by the formation of amino and carboxyl groups, and the electrostatic repulsive forces between -CONCl and ClO-. The maximum level of N-chlorination was 63% based on NaOCl when 10 molar % of NaOCl to the carbamoyl group was applied to an aqueous solution of PAM.
The effect of N-chlorinated PAM (N-Cl-PAM) on paper strength was compared with that of an anionic PAM (A-PAM) with the same molecular weight (7.25×105). Polydimethyldiallylammonium chloride (PDMDAAC) was added as a retention aid for N-Cl-PAM and A-PAM at the level of 0.1% or 0.2% on pulp. Handsheets showed an increase in dry tensile strength, for example, of 46% by the addition of N-Cl-PAM at 0.5% level based on dry pulp at slightly alkaline conditions, while of only 25% in the case of A-PAM under the same adsorption rate (77%). When N-Cl-PAM was employed at slightly acidic conditions, the retention of N-Cl-PAM reached to 90% even if the retention aid was not present, and an increase in strength was 44%. It was suggested that the paper strength was greatly improved by the formation of covalent bonds to some extent.View full abstractDownload PDF (1241K) -
[in Japanese], [in Japanese], [in Japanese]1994 Volume 48 Issue 3 Pages 493-498
Published: March 01, 1994
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (756K)
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