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Volume 42, Issue 11
Displaying 1-8 of 8 articles from this issue
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Taigi Morimoto1988 Volume 42 Issue 11 Pages 995-1009
Published: November 01, 1988
Released on J-STAGE: November 16, 2009
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Hideki Fujiwara, Chizuru Kaga1988 Volume 42 Issue 11 Pages 1010-1021
Published: November 01, 1988
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSSurface chemistry is now an important method in studies of coated paper. Several techniques have been studied in order to determine the binder concentration in coating layer because the binder migration is one of the major interests in coating technology. Resently, a technique for the analysis of SB-latex concentration on the surface of coated paper was developed. With this method, SB-latex concentration is measured by reflected ultraviolet absorption, and the surface latex profiles as well as its concentration are obtained.
In this paper, the fundamentals, the system control, and applications of this technique comparing with ESCA are reviewed.View full abstractDownload PDF (1759K) -
Masahiro Koizumi1988 Volume 42 Issue 11 Pages 1022-1028
Published: November 01, 1988
Released on J-STAGE: November 16, 2009
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Process Control And Automation Committee1988 Volume 42 Issue 11 Pages 1029-1039
Published: November 01, 1988
Released on J-STAGE: November 16, 2009
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PART II. Results of Application in Commercial Paper MillsMasayoshi Suguri1988 Volume 42 Issue 11 Pages 1040-1046
Published: November 01, 1988
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSFollowing previous studies in which resins were evaluated on an experimental basis for applicability to supercalender rollers and on-machine soft calender rollers, the present paper describes conditions and results of plastic roller application in commercial paper mills. Plastic rollers are used for four types of soft-nip calenders, of which three are on-machine soft calenders and one is an off-machine soft calender. The on-machine soft calenders have been operating successfully and the off-machine soft calender has also been in smooth operation, although some initial problems were encountered. Although super-calenders have been operating favorably for thermosensitive paper, the application to the production of glassine paper is being tested. In addition, for other types of paper, only one or two rollers for multiroll super-calenders have been used, and applications are still being developed. The paper finishes by considering precautions to be taken when using plastic rollers.View full abstractDownload PDF (1037K) -
1988 Volume 42 Issue 11 Pages 1047-1050
Published: November 01, 1988
Released on J-STAGE: November 16, 2009
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Evaluation of Flocculation Behavior of Paper Stocks by Laser-optical and Image Processing Methods. IFlocculation Behavior under Static ConditionsChangman Sohn, Fumihiko Onabe, Makoto Usuda1988 Volume 42 Issue 11 Pages 1051-1058
Published: November 01, 1988
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThis experimental work is intended to investigate the flocculation behavior of paper stocks under static conditions using laser-optical and image processing methods. Zeta potential measurement was also utilized to determine the surface charge characteristics of various components of the stock.
Interactions among various components in paper stock were investigated by the change in the intensity of transmitted and scattered lights through the sample cell while stock were in sedimentation state. Image processing method was used to visulalize the flocculation behavior of stock.
It was found that the sedimantation of stock components proceeds in different two steps : flocculation by polymer bridging and subsequent sedimentation.View full abstractDownload PDF (5652K) -
Relationship between water retention values and mechanical strengths of handsheets from bleached TMPTae Soo Cho, Hisao Ishikawa1988 Volume 42 Issue 11 Pages 1059-1069
Published: November 01, 1988
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSWater retention value (WRV) is a valuable parameter for papermaking, and is widely used in pulp evaluation. The purpose of present investigation is to clarify and discuss influence of WRV on the physical properties of bleached TMP, such as apparent sheet density and sheet strength. TMP fraction on 24 mesh were bleached by a NaClO/peroxides system under mild conditions to various degrees of delignification. Then, physical properties were measured for each of partially delignified TMP and for handsheet from the TMP. Furthermore, the bleached TMP fibers were examined by comparing the morphological images obtained by scanning electron microscope. Following results were obtained.
WRV increased gradually with increase in delignification degree. In other words, increase in hydrophilic degree of partially bleached TMP brought about an increase in WRV. WRV of never-dried TMP bleached by NaClO/H2O2 and NaClO/O3 system were linearly related to apparent density of the handsheets. Tensile strength and burst factor of the sheets prepared from the bleached TMP were shown to be proportional to WRV. Folding endurance increased sharply with a slight increase in degrees of delignification. On the other hand, tear factor decreased after reaching to the maximum value, as the delignification proceeded. It was shown by scanning elctron photomicro-graph that the TMP fibers were swollen and softened by the mild bleaching with the NaClO/ peroxide system.View full abstractDownload PDF (5772K)
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