塗布のレオロジー : 塗布量に影響を与える因子について

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The study has been made of the relations between the physical property of liquid and the thickness of a layer of liquid remaining on the all, after draining the liquid and the thickness of the liquid layer coating a solid body drawn out of a liquid. The thickness h of coated layer was calculated following equation by the weight method. h=W/2 _ρS W: corrected weight of the coated layer that is released of surface tension effect. ρ:density of liquid S: coated area The relations between the thickness of coated gelatin solution and glycerin solution, the physical properties of those and the moving velocity of the solid are shown in Table I, which indicates the difference between the observed and the calculated value. These differences are attributed to the temperature difference between the solid and the liquid, or between ambient air and the liquid which cause viscosity increase of liquid which remains on the solid. The experimental results which exclude temperature difference are shown in Fig. 6 and these results accord with the values calculated by equation (4) which is derived from neglecting the surface tension below 6.38 cm/sec of coating velocity. In Fig. 8, equation (8) is obtained which combines the force F of lifting solid and the above mentioned equation (4). As shown in Fig. 9, Fig. 10, the observed values accord with the values calculated by equation (8) below the coating velocity 2.22 cm/sec within the values of viscosity ranging from 0.050 to 10 poise. The region where equation (8) is satisfied becomes narrow with an increase of the coating velocity. For example, the observed values accord with those calculated within the viscosity range 0.050- 0.780 poise at coating velocity 6,38 cm/sec. Therefore the thickness of coated layers can be calculated by measuring dF/dt and using equation (8) in the above designated region. The deviation of the observed thickness in the high viscosity region points to the appearance of non-Newtonian behavior. Then the deviation in the low viscosity region as shown in Fig. 6, Fig. 8 and Fig. 10 is considered to be owing to the dynamic surface tension effect which appeared at high speed coating. The equation (5) containing the term of surface tension is derived by Deryagin. In order to obtain the required thickness 0.0176 cm, the coating velocity was calculated 13.2 cm/sec by the equation(5) and 8.02 cm/sec by the equation (4) respectively. The expected thickness was obtained by coating gelatin solution with 8 m/min.
社団法人日本材料学会の論文
1965-04-15

塗布のレオロジー : 塗布量に影響を与える因子について

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