What equipment does a paper machine consist of?

Papermaking equipment is a machine that includes raw material preparation, pulping, papermaking, until it is made into rolls or flat sheets, and processing paper and cardboard.

Material preparation equipment

Material preparation equipment is equipment for pretreatment and processing of paper-making raw materials according to the requirements of the cooking or refining process before cooking or refining. It is divided into non-wood fiber preparation equipment and wood fiber preparation equipment. The former includes grass cutters, reed cutters, and sugarcane decontamination machines, while the latter includes debarkers and chippers.

Pulping equipment

Pulping equipment is the equipment used in the process of separating plant raw materials into fibers. Pulping methods can be divided into chemical, mechanical, and chemical-mechanical methods. The corresponding pulping equipment includes digesters, refiners, heat mills, washing machines, bleaching machines, beaters, and waste liquid recovery equipment.

After the wood chips are preheated by steam, the slurry that is ground under high pressure is called hot wood chip groundwood pulp. The machine that makes hot wood chip groundwood pulp is the heat mill. The heat mill consumes a lot of power, so it is sufficient. Utilizing the heat energy in the refining process is the key issue of the thermal mill; the pulp washing machine is 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 a white color. A bleaching machine is a kind of bleaching equipment commonly used, which is composed of a bleaching tank screw propeller, washing drum, and other components. The slurry and bleaching agent are placed in the pool and the washing water is continuously added, and the screw propeller is used to circulate in the pool to complete the process of mixing and chemical reaction. The water with bleaching products and residual bleaching liquid is discharged through the inner cavity of the washing drum so that a white pulp is obtained.

The paper machine is a complete set of equipment linked to the division of the pulp into the paper web, including the headbox, the wire section, the press section, the drying section, the calendar, the paper reel, and the transmission section. , Lubrication, heat recovery, and other auxiliary systems. The wire part that forms the wet paper web is the core of the paper machine, so the paper machine can be divided into fourdrinier paper machine, clamp paper machine, and cylinder paper machine according to the structure of the wire part.

After the paper sheet from the drying, the section is calendered by the calendar, the smoothness, gloss, and tightness of the paper sheet can be improved, the thickness of the whole paper sheet can be uniform, and the air permeability can be reduced; finally, the paper web is compressed by the reeling machine. Rolling into a paper roll completes the main process of papermaking. In order to meet different needs in the future, there are supercalenders, rewinders, paper cutters, etc. behind the paper reel in the papermaking workshop.