Process requirements of small paper machines. This kind of shutdown is mainly to ensure product quality and meet the production process requirements, especially the production of high-grade cultural paper. The main reasons for shutdown are as follows: first, the function of wet end water filtering and dewatering elements (or materials) decreases after a certain period of use, and the dewatering and filtering can not reach the initial effect, so they need to be cleaned regularly. Second, replace the main process equipment, such as copper mesh and wool cloth, which need to be replaced regularly after reaching the service life; The press rubber roller and stone roller are worn by the contact between paper and scraper, and the medium height of roller surface changes, which will affect the product quality and also need to be repaired regularly.

　　It is a recovery, treatment and reuse system for dehydration of paper machine forming department. It includes white water collection, transportation, filtration or sedimentation, air flotation and other equipment to separate and recycle fibers and fillers, as well as the whole system to recycle the clean white water in the papermaking process.