Xuan writing brush Xuan writing brush Xuan writing brush or Xuanbi (), is a type of ink brush made in Anhui Province, China. Xuan brushes are often mentioned together with the famous Xuan paper - a kind of writing paper (rice-paper). The ink brushes are normally made in Jingxian County (currently Jing County) of Anhui Province. In ancient times, Jingxian County was under the jurisdiction of Xuanzhou Prefecture (宣州府; Xuān-Zhōu Fǔ; currently Xuancheng), so its name bears the character "Xuan" (Xuān). The Xuan brushes gained popularity in Jin Dynasty (256-420) among classic scholars, governmental officials, calligraphists and painters. During the Tang Dynasty (618-907)
Paper machine nips formed by rolls pressing against each other aided by press felts that support the sheet and absorb the pressed water. The dryer section of the paper machine, as its name suggests, dries the paper by way of a series of internally steam-heated cylinders that evaporate the moisture. Calenders are used to make the paper surface extra smooth and glossy. In practice calender rolls are normally placed vertically in a "stack". From the machine chest stock is pumped to a head tank, commonly called a "head tank" or "stuff box", whose purpose is to maintain a constant head (pressure) on