造纸在我国,树皮自东汉以来就是重要的造纸原料。曾在巴拿马国际博览会上荣获金质大奖和1979年荣获全国优质产品金质奖章的宣纸,它的主要原料就是青檀树皮。这种树皮的纤维长、拉力强、韧性好,用它造纸具绵韧、洁白、纹理美观,搓折无损,久不变色,润墨性强等特点,能保存千年完好如新。它不仅是画家用于绘画、书法的珍品,而且是外交照会、历史档案、重要史 Papermaking in our country, bark since the Eastern Han Dynasty is an important papermaking raw materials. Xuan Paper, which won the Gold Medal at the Panama International Exposition and the Gold Medal of National Quality Products in 1979, is the main raw material of P. chinensis bark. This bark of fiber length, tensile strength, good toughness, with its paper making cotton tough, white, beautiful texture, rubbing nondestructive, long time no discoloration, strong ink and other characteristics, can save thousands of intact as new. It is not only a painter for painting, calligraphy treasures, but also the diplomatic note, the history of the file, an important history