Studies on the Paper Yarn (Report 7)

Abstract

We made experiments to find out the Resin Treatment method of thin paper. We tested how the properties of the same Resin affected a sheet of thin paper when it was finished over with Melamine Formaldehyde Resin.(1) Relationships between Resin added-% on fiber and the paper strength :Diy strength increased so far as the increase of Resin content of sheet was within 10%, but it decreases when the increase of Resin content was more than 17%.Wet strength had a tendency to increase in proportion to the Increase of Resin content so far as Resin content was low, but when Resin added-% become more than 10%, the increasing tendency of the wet strength was diminished, becoming 50-70% of the dry strength of untreated paper.(2) Aging conditions and the strength of treated paper :When Reisn directly prior to the gelling, was used, the paper strength was greater than in the case of (1). As for the aging conditions, the concentration of 15%-16% and the aging temperature of 80-90°C, are convenient for the manipulation in its industrial production.(3) Curing temperature. curing hour, and the strength : Though it is commonly believed that 130°C., 10mins. (the application of which conditions is common in the factories, ) are essential, but 100±5°C., 30 minutes. were perfect for the curing.