How many pieces of Xuan paper are knife paper?

Yuan Shu paper is a kind of bamboo paper, which was called Xieting paper in ancient times, also known as Xiegong paper. It was named Yuanshu Paper because the emperor used it to write sacrificial ceremonies at the Temple Fair in Yuanri, and it was also called Xiegong Paper or Xiegong Paper because the famous minister Xie Fuchun praised the making of this paper. Xuan paper is a traditional paper for painting and calligraphy in China. Its raw material is mainly sandalwood. It originated in Jingxian County, Xuancheng, Anhui Province, and was named "Xuan Paper" after the government ruled Xuancheng. A piece of "knife" paper describes ancient papermaking. The paper that has just been made is neatly placed one by one, without being scratched or stained with some ink. As soon as the knife fell, a pile of thick vertical blanks was immediately split, and the burrs could not fly. The neat sound line is still in my ear ... I caught this feeling, and the number that a "knife" can completely cut is called a "knife"