Industry definition and classification of paper machine

The industry definition of paper machine refers to machinery that includes raw material preparation, pulping, papermaking, until it is made into rolls or finished products, and processing paper and board. The following is the definition and classification of the edited paper machine.

Types of paper machines: paper machines include fourdrinier multi-cylinder paper machines, rotary paper machines, etc. The types of paper machines used are different according to different paper products.

Equipment classification: The material preparation equipment is the equipment for pretreatment and processing of papermaking raw materials before cooking or refining according to the requirements of the cooking or refining process. It is divided into non-wood fiber material preparation equipment and wood fiber material preparation equipment. The former includes grass cutters, reed cutters, and sugarcane depidders, while the latter includes peelers and chippers.

Pulping equipment is the equipment used in the process of separating plant material into fibers. Pulping methods can be divided into chemical methods, mechanical methods and chemical mechanical methods. The corresponding pulping equipment includes digesters, wood grinders, thermal mills, pulp washers, pulp bleaching machines, pulping machines and waste liquid recovery equipment.

The machine for making hot wood chip ground wood pulp is the thermal mill, which consumes a lot of electricity, so making full use of the heat energy in the refining process is the key issue of the thermal mill; The mechanical equipment for liquid separation, the bleaching machine is a commonly used bleaching equipment, which consists of the screw propeller of the bleaching tank, the washing drum and other components. The pulp and bleach are placed in the tank and continuously added to the washing water, and circulated in the tank with the help of the screw propeller to complete the process of mixing and chemical reaction. The water with bleaching products and residual bleach is discharged through the inner cavity of the drum, resulting in a white pulp.

The paper machine is a complete set of equipment that makes the pulp to form the paper web, including the headbox, wire section, press section, drying section, calender, reeling machine, as well as the main engine such as the transmission section and steam, water, vacuum , 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, sandwich paper machine and rotary wire paper machine according to the structure of the wire part.

The headbox is a device that uniformly and stably sends the slurry of appropriate concentration to the net through the pulp distributor, rectifier, weir tank, weir plate nozzle and other components, also known as the head box; the slurry is sprayed from the headbox to the copper After the wire, the wet paper sheet is formed on the wire part and dehydrated; after that, the moisture of the wet paper sheet from the wire part is squeezed out, and then enters the drying part, and the paper sheet from the drying part is calendered by a calender After that, the smoothness, gloss and tightness of the paper sheet can be improved, the thickness of the paper sheet can be uniform across the whole width, and the air permeability can be reduced; finally, the paper web is rolled into a paper roll by the reeling machine, which completes the main process of papermaking.

In the future, the future of paper machine will be developed to use a wide range of papermaking raw materials, reduce material and energy consumption in the papermaking process, and reduce environmental pollution.