Resin Coating of Hand-made Japanese Paper with Latex

Abstract

Pulps made from Kozo (paper mulbery, Broussonetia kajinoki Sieb 29), one of the most essential fiber materials of the Japanese papers, were coated or impregnated with synthetic Latex resin emulsions and their mechanical and physical strength characteristics were tested.
Good results in the strength test were obtained when coating was done with acryl amide water soluble resin.
With regard to applying the synthetic resin in general, it was found that the results brought about by the internal addition into the fiber suspension were better than those resulted from outside addition, i. e. after the sheet is formed (and dryed to a certain degree).
It was also revealed that the so-called nagashi-zuki (worker's own sheet forming motion on the mould along with his dipping out suspended fibers from the stock chest), which implies the most significant characteristic of the hand-made Japanese paper making techniques, becomes considerably difficult when the amount of the added resin exceeeds its maximum limit.