Papermaking machinery includes raw material preparation, pulping, papermaking, until it is made into rolled or flat finished products, as well as the processing of paper and paperboard. It is an equipment for pretreatment and processing of papermaking raw materials according to the requirements of cooking or pulping process before cooking or pulping. It is divided into non wood fiber preparation equipment and wood fiber preparation equipment. The former includes grass cutter, reed cutter and sugarcane pulper, while the latter includes Skinner, chipper, etc. Chipper is a machine for cutting logs required for the production of wood pulp into chips of certain specifications, which is divided into disc and drum types; Digester is an equipment that dissolves lignin in papermaking raw materials into cooking liquid to separate papermaking raw materials into fibers. It is divided into intermittent type and continuous type; Wood mill is the equipment for producing wood pulp. According to the production mode, it can be divided into intermittent type and continuous type. According to the pressure mode of log, it can be divided into hydraulic pressure type and mechanical pressure type;

　　Pulping equipment is the equipment used in the process of separating plant raw materials into fibers. Pulping methods can be divided into chemical method, mechanical method and chemical mechanical method. The corresponding pulping equipment includes digester, wood mill, heat mill, pulp washer, bleaching machine, beater and waste liquid recovery equipment. The pulp of wood slices preheated by steam and then ground under high pressure is called hot wood flake ground wood pulp. The machine for manufacturing hot wood flake ground wood pulp is a heat mill, which consumes a lot of power. Therefore, making full use of the heat energy in the pulp grinding process is the key problem of the heat mill; Pulp washer is a mechanical equipment that separates the cooked pulp from the black liquor. According to the black liquor extraction rate, there are two categories: high concentration and low concentration extraction.

　　The purpose of pulp bleaching is to remove the residual lignin and pigment in the pulp after cooking, improve the whiteness of the pulp and make the pulp have white color. Pulp bleaching machine is a widely used bleaching equipment, which is composed of pulp bleaching tank, screw propeller, washing drum and so on. The slurry and bleach are placed in the tank and continuously added with washing water, which circulates in the tank with the help of screw propeller to complete the process of mixing and chemical reaction. The water with bleaching products and residual bleaching liquor is discharged through the inner cavity of the washing drum to obtain white pulp.