The paper machine is a complete set of equipment that enables the pulp to form a paper web, including headbox, mesh department, press department, drying cadre, calender, coiler, transmission department and other host machines and auxiliary systems such as steam, water, vacuum, lubrication and heat recovery. The net part forming the wet web is the core of the paper machine, so the paper machine can be divided into long net paper machine, clip net paper machine and round net paper machine according to the structure of the net part.
Headbox is the equipment that evenly and stably sends the slurry with appropriate concentration to the network through the slurry distributor, rectifier device, weir pool, weir plate nozzle and other components, also known as the front box of the network; After the slurry is sprayed from the headbox to the copper mesh, a wet paper sheet is formed on the mesh and dehydrated; Then press, that is, squeeze out the moisture of the wet paper sheet from the mesh by mechanical method, improve the dryness of the paper sheet, improve the surface properties of the paper sheet, eliminate mesh marks and increase smoothness, tightness and strength; Then it enters the drying cadre to further dehydrate the pressed wet paper, shrink the paper, closely bond the fibers and increase the strength.
After being calendered by the calender, the smoothness, gloss and tightness of the paper can be improved, the full thickness of the paper can be consistent, and the air permeability can be reduced; Finally, the paper web is rolled into paper rolls by the paper coiler, that is, the main process of papermaking is completed. In order to meet different needs in the future, super calender, rewinder, paper cutter, etc. are also set behind the paper coiler in the paper workshop.
The 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 papermaking machinery will be to use a wide range of papermaking raw materials, reduce material and energy consumption in papermaking process, and reduce environmental pollution.
