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Volume 20, Issue 7
Displaying 1-7 of 7 articles from this issue
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[in Japanese]1966 Volume 20 Issue 7 Pages 347-351
Published: July 05, 1966
Released on J-STAGE: November 11, 2009
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[in Japanese]1966 Volume 20 Issue 7 Pages 353-358
Published: July 05, 1966
Released on J-STAGE: November 11, 2009
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[in Japanese]1966 Volume 20 Issue 7 Pages 359-368
Published: July 05, 1966
Released on J-STAGE: November 11, 2009
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The Effect of Wood Extractive on Color of ThioligninJunzo Nakano, Kenji Iiyama, Hyoe Hatakeyama, Nobuhiko Migita1966 Volume 20 Issue 7 Pages 369-376
Published: July 05, 1966
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSThe purpose of this study was to determine the influence of wood extractives on the color of thiolognin from sulfate cooking. Tests were carried out on shavings made from freshly cut Japanese red pine (Pinus densiflora), Yezo spruce (Picea jezoensis), Sugi (Cryptomeria japonica) and white birch (Betula Tauschii) woods and fromsimilar samples after storage for 3, 6 and 8 months in the unbarked condition.
Wood shavings extracted with alcohol-benzene were obtained, on each of the above wood species. Non-extracted and extracted shavings were cooked separately under the same condition : active alkali 41.0 g/l (as Na O), sulfidity 26.0%, max, temp. 165°C, total cooking time 3.0 hrs. and liquor ratio 1 : 7. The isolated thiolignins were examined by the absorption of ultraviolet and visible light. Reflectance spectrum was also measured on dried thiolignin powder crushed to less than 100 meshes, and the color of thiolignin was expressed by the X Y Z system of C.I.E., so-called visual efficiency Y %, dominant wave length λd mμ and percent saturation Pe %.
The values obtained in this experiment were analyzed statistically. The results are as follows :
(1) Wood extractives appear to combine with protolignin during storage of pulpwood or sulfate cooking, but have little effect on the color of thiolignin.
(2) The oxdation of lignin during storage of pulpwood makes dominant wave length change to longer wave length for softwood, but to shorter for hardwood (white birch). Visual efficiency and percent saturation are largely unaffected by storage times of pulpwood.
(3) There is considerable difference of the thiolignin color among wood species, especially between softwood and hardwood. However, there is no difference between sapwood and heartwood in the case of Sugi.View full abstractDownload PDF (1189K) -
Its Process and Calcination by Pneumatic Conveying KilnKatsuhiro Nozawa1966 Volume 20 Issue 7 Pages 377-382
Published: July 05, 1966
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSExperimental method of obtaining regenerated lime slurry by means of high temperature gas coming from pneumatic regenerator newly developped for laboratory use has been described. Its initial moisture of 150% D.B. was previously reduced to some 40% and then dried to below 5%. It was finally shot by pneumatic high temperature gas when passing through the disintegrator rod, the maximum transfer coefficient of which ranges from 4500 to 5000 W/∂ρ.
It has been revealed that in the course of operation of the pneumatic conveying dryer the variation of high temperature gas traced on the Morier diagram moves exactly along with the adiabatic cooling line, its individual values thus having been proved to be almost equal to the theoretical ones.
It is shown that the pneumatic conveying dryer system can be adopted as the most useful for the purpose of drying lime slurry.
After drying lime slurry was burned by the pneumatic kiln, burrning efficiency being leveled up to 80% per cent.View full abstractDownload PDF (1023K) -
Part VI Influence of Testing Environment on the Physical Properties of Paper made from Grafted PulpSang Bong Lee, Mitsuo Fujii1966 Volume 20 Issue 7 Pages 383-390
Published: July 05, 1966
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSTwo kinds of paper were made as follows :
(a) One was made from methyl methacrylate (MMA), ethyl methacrylate (EMA), and butyl methacrylate (BMA) grafted pulp of various degree of grafting.
(b) The other was made by saturating the paper made from original pulp with various concentration of polymer (PMMA, PEMA and PBMA) solution.
Stress-strain curves for these paper were measured over the temperature range from -10°to 130°C, and folding endurance was also examined at various temperatures.
Physical properties of these paper are directly affected by relative humidities at the definite testing temperature : i.e., tensile strength of the paper decreases with increasing relative humidities, while elongation-at-break increases.
There is a maximum value in every case for stress-temperature curves and the temperature which gives the maximum value correspond to the glass transition temperature (Tg) of the polymers in the case of (b), but the temperature are 40°60°C in the case of (a).
These results are mainly due to two effects : one is to increase the paper strength owing to the decrease of moisture content in sheet with increasing temperature, and the other is to decrease owing to the decrease of yield point of the polymer above Tg.
Folding endurance of the paper decreases with the increase of testing temperature. As this property is remarkably affected by the flexibility of the fibers, it is considered to be due to the dominating effect of the moisture content in sheet rather than temperature effect against the polymer.
The effect of heat treatment on the paper strength was observed by changing the heating temperature, and it was found that the higher paper strength can be obtained by treating the paper above the softening point of the polymer.View full abstractDownload PDF (1379K) -
[in Japanese]1966 Volume 20 Issue 7 Pages 391-396
Published: July 05, 1966
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSDownload PDF (788K)
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