Abstract
This work was undertaken to study the effects of base paper structure on the coated surface characteristics by observing fiber interfaces of coating layers with a scanning electron microscope. In order to observe fiberinterfaces of coating layers, it was required to separate the coating layer from the base paper without destruction.
The author applied the following techniques for kaolinite coated papers of various binder compositions.
(1) The coated paper of which surface was backed with a polystyrene plate was placed in 72% sulfuric acid for 1.52-hr. The base paper dissolved out leaving the coating layer backed with the polystyrene plate. This technique was found satisfactory for the paper coated with latexstarch-PVA binder.
(2) For the papers coated with latex-starch binders, coating layer were destroyed in some degree during 72% sulfuric acid.treatment. Instead of 72% sulfuric acid treatment., Celluase-CEDA treatment was found effective for these papers.
(3) Scanning electron micrographs of fiber interfaces of coating layers were proved especially of value in studying the correlation between base paper structure and penetration of coatings.
