Abstract
Pore structure of coatings is closely related to ink absorption in printing process. In the previous paper drying conditions and latex content were discussed as regulating factors of coating structure.In the present paper influence of pigment composition and calendering on the liquid absorbency of coated paper were examined by Bristow's method and ultrasonic attenuation method.Pigment compositions of coated paper samples prepared were altered by changing clay and calcium carbonate ratio with different particle shapes and sizes.Conclusions obtained are as follows;1.Absorbed water volume increased with the ratio of calcium carbonate which has largerparticle size than clay.2. Total pore volume in coatings occupied with water could be calculated from Bristow's curve for the coated paper samples with the same smoothness as that of their base paper.3. Calendering decreased the transferred liquid volume.The reason for this finding may be that calendering leads to the smoothness improvement and compression of coatings that in turn made the pore volume smaller. However, that did not influence the absorption rate when water penetrated through the base paper layer.
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