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Volume 39, Issue 8
Displaying 1-7 of 7 articles from this issue
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Coating Materials (1) : LatexJujiro Kohno1985 Volume 39 Issue 8 Pages 723-732
Published: August 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSI have summarized the recent trends and current status of improvements and developments of coating materials. In this report I would like to specifically introduce those of SB latex in the first place.
Various improvements have been made on SB latex for getting not only adhesive function but also printabilities such as ink-receptibity, print gross, ink-set and blistering. In other words, optimum ratios of S to B have been established and unsaturated vinyl compounds containing several kinds of functional group have been introduced. And further such factors as gel percentage and particle size have been examined together.
As a result, the SB latex suitable for the use of sheet, web-offset and rotogravure printing has been developed in compliance with the quality requirements of printing papers.
In Japan, this SB latex is primarily used for the coated printing paper except for some special purposes.View full abstractDownload PDF (1360K) -
Hiroslu Yamada1985 Volume 39 Issue 8 Pages 733-746
Published: August 01, 1985
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSData are collected with regard to wetting in the papermaking and related fields for the purpose to aid research and practice in the future.
In this first part, following the fundamentals well known hitherto, surface-energetic values of wood fibers, synthetic fibers and filaments, fillers and pigments, and paper machine wire were presented together with those of auxiliaries for paper.View full abstractDownload PDF (1772K) -
Fumihiko Togashi, Kenichi Katahe1985 Volume 39 Issue 8 Pages 747-756
Published: August 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSIn this paper, following articles are briefly reviewed.
1) General chemicals of Surfactants used as Deinking Agent.
2) Function which required in Deinking Process.
3) Current of Deinking Agent.View full abstractDownload PDF (3972K) -
1985 Volume 39 Issue 8 Pages 770
Published: August 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (109K) -
Part III : The Computer Model for Evaluating the Effects of the Cross Directional Variationsof Operating Conditions at each CylindersKiyoaki Iica1985 Volume 39 Issue 8 Pages 771-776
Published: August 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSIt is reported in Part I and Part II of this series that the computer model can simulate the web drying phenomena in a paper machine dryer section by feeding the several operating conditions at each cylinder The model, a simplified version in Part I, is now modified to evaluate the effects of the cross directional variations of operating conditions at each cylinder and simulate the resulting cross directional variations of web drying.
First, heat and mass transfers in a cross direction of a web within a web layer during drying are calculated and compared to those between a web and its surroundings, such as heat transfers from cylinder surfaces to a web and water evaporation from a web to atmospheres. It is found that the former are far much smaller than latter, and can be neglected in a drying process of a paper machine. In other words, a web can be regarded to be independent crosswise.
Then, based on these results, the model is extended to a following structure.
1. A cross direction is divided into a certain numbers of blocks.
2. The simulations, similar to those in Part I and Part II, are carried out at each block, using their own operating conditions. It means that every block of a web dries up independently each other throughout drying, depending only on it circumstances.
3. The results on each block are combined in parallel to give their profiles in a cross direction at any locations in a dryer section.
The simulated results by this model correspond well with various experiences in mill operations, which suggests that the model is reliable enough. So, this extended model will be further used in Part IV of the series to predict the effects of the cross directional variations of several operating conditions, like cylinder surface temperatures and cylinder pocket humidities, to web drying in some commercial paper machines.View full abstractDownload PDF (737K) -
Studies on Load Elongation Behavior of Paper (Part 2)Minoru. Kimura, Hiroshi Shimizu1985 Volume 39 Issue 8 Pages 777-784
Published: August 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSMechanical behavior of a relatively weak spot in paper during deformation was investigated by the finite element method. Significant stress and strain concentrations could be found when the spot was located outermost in the rectangular specimen. Thicker spots connected crosswise to the defect showed a remarkable reinforcing effect on the mechanical response of the thin spot, while they contributed rather negatively if arranged lengthwise. Paper has a non-uniform distribution of mass, and stress and strain of a certain spot may result from a complicated combination of the mechanical phenomena.View full abstractDownload PDF (987K) -
Kazutoshi Yoshihara, Isao Akamatsu, Hiroshi Kamishima1985 Volume 39 Issue 8 Pages 785-791
Published: August 01, 1985
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSBiodegradation of lignin was investigated by usingCoriolus hirstusIFO 4917 and poplar wood meal (42-60 mesh). The optimum cultivation conditions were also studied.
Optimum temperature and pH were 35°C and 4.0 to 7.0, respectively. The optimum moisture content was ca. 54% (This value is equivalent to ca. 2 mlof the basal medium to ca. 1 g of poplar wood meal.). Under conditions above mentioned, about 25% of lignin was decomposed after ten days.
As a carbon source, carboxymethyl cellulose sodium salt (CMC) was most effective in the lignin decomposition by C. hirstus IFO 4917. By using CMC, lignin decomposition after 10 days increased to 27.4%. Two percent molasses was also effective as the carbon source.
For a nitrogen source, urea was the most effective one. Addition of 0.5% glucose as the carbon source and 0.2% urea as the nitrogen source to the basal medium increased poplar lignin decomposition to as much as 31.5% for 10 days. Amino acids such as L-Arginine, L-Asparagine, and L-Citrulline were also effective as another nitrogen source in lignin decomposition of poplar wood meal. These components are well known as the members of the urea cycle.View full abstractDownload PDF (1041K)
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