Material preparation equipment

    It is the equipment for pretreatment and processing of papermaking raw materials before cooking or refining according to the requirements of cooking or refining process. It is divided into non wood fiber preparation equipment and wood fiber preparation equipment. The former includes grass cutter, reed cutter and sugarcane pulp remover, while the latter includes peeler and chipper.

    Chipper is a kind of machine which can cut the logs required for producing wood pulp into chips of a certain specification, which is divided into disc type and drum type; digester is a kind of equipment which can dissolve the lignin in the paper-making raw materials in the cooking liquid and separate the paper-making raw materials into fibers, which is divided into intermittent type and continuous type; wood grinder is a kind of equipment for producing wood pulp, which can be divided into intermittent type and continuous type according to the mode of production There are two types of pressurization: hydraulic pressurization and mechanical pressurization;

Pulping equipment

        It 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 grinder, hot mill, pulp washer, pulp bleaching machine, pulp beater and waste liquid recovery equipment.

       Wood chips are heated by steam and then ground under high pressure. The machine for making hot wood chips is hot mill, which consumes a lot of power. Therefore, making full use of the heat energy in the process of grinding is the key problem of hot mill. Pulp washer is the mechanical equipment for separating the pulp from black liquor. According to the extraction rate of black liquor, it has 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 brightness of pulp, and make the pulp have white color. Bleaching machine is a kind of bleaching equipment which is widely used. It is composed of screw propeller of bleaching tank and washing drum. Pulp and bleach are put in the tank and washing water is added continuously. With the help of screw propeller, they circulate in the tank and complete the process of mixing and chemical reaction. The water with bleach products and residual bleach liquor is discharged through the inner cavity of the washing drum to obtain white pulp.

paper machine

       It is a complete set of equipment to make the pulp form a web, including headbox, net part, press part, dryer, calender, Winder, transmission part and auxiliary systems such as steam, water, vacuum, lubrication and heat recovery. The web forming the wet web is the core of the paper machine, so the paper machine can be divided into long web paper machine, pinch web paper machine and round web paper machine according to the web structure.

Cast iron dryer press roll for paper machine

        Headbox is a kind of equipment which can send the pulp of appropriate concentration to the net evenly and stably through the distributor, rectifying device, weir pool, weir plate nozzle and other parts, also known as the net front box. After the pulp is sprayed from headbox to the copper net, the wet paper is formed on the net and dehydrated. Then it is pressed, that is, the moisture of the wet paper is extruded from the net by mechanical method to improve the dryness of the paper At the same time, it can improve the surface properties of the paper, eliminate the net mark and increase the smoothness, tightness and strength; then it can enter the drying section to further dehydrate the wet paper after pressing, so as to shrink the paper, make the fiber bond tightly and increase the strength.

       The paper from the dryer can be calendered by the calender, which can improve the smoothness, glossiness and tightness of the paper, make the whole thickness of the paper consistent, and reduce the air permeability. Finally, the paper is rolled into a paper roll by the winder, which completes the main process of papermaking. In order to meet the different needs in the future, there are also super calender, rewinder, paper cutter and so on behind the winder in the paper workshop.

       Paper industry will consume a lot of raw materials, water, electricity and chemicals, and produce a lot of wastewater and waste residue. Therefore, the future of paper machinery will use a wide range of paper-making raw materials, reduce the consumption of materials and energy in the paper-making process, and reduce environmental pollution.