1. Wear and tear: Reason one is the wear and tear of components and equipment that come into contact with copper mesh, woolen cloth, pulp, and formed paper for a long time, such as pulp pumps, pulp crushers, desanders, vacuum box panels, press rollers, calendering rollers, etc; Reason 2: Parts that move relatively frequently between components, such as scrapers, inlet heads, cylinders, vacuum rollers, vacuum pumps, etc.　　2. Lubrication: Mechanical rotation cannot be separated from bearings. Paper machines, mainly composed of rotating rollers, have a wide variety of types and quantities of rollers, with hundreds of different types of bearings. Therefore, lubrication management work is very important, especially affected by water, high temperature, and heavy loads. Lubricating oil (grease) is prone to loss, evaporation, and aging, which can damage the lubrication effect, cause bearing damage, and shaft head wear. Therefore, regular inspections and refueling are essential.　　3. Fatigue: Heavy load and continuous operation of machinery are prone to fatigue failure. On paper machines, due to the constraints of mechanical structure and operating principles in certain parts, the design strength of components (such as mesh table shaking spring plate, electromagnetic clutch suction cup, coupling overload prevention pin, etc.) should not be too large to avoid damage. The solution can be taken through measures such as maintenance and technological improvements.

　　Traditionally, the paper machine is divided into long mesh, circular mesh, sandwich mesh, and mixed long circular mesh models according to the type of paper forming machine used; There are also cultural paper machines (including newsprint), cardboard machines (including packaging paper), toilet paper machines, and special paper machines based on their main product varieties; Or according to the thickness of the produced paper, it can be divided into thin paper machines, cardboard machines, and conventional paper machines.

　　A paper machine is a collective term for a complete set of equipment that forms a paper web for pulp, including a main unit such as a pulp box, a mesh unit, a pressing unit, a drying unit, a calendering machine, a paper rolling machine, and a transmission unit, as well as auxiliary systems such as steam, water, vacuum, lubrication, and heat recovery.　　A machine that produces paper by dewatering the pulp water suspension that meets the requirements of papermaking through a filter, mechanical extrusion dewatering, and drying processes. The paper machine consists of three main parts: forming, pressing, and drying, which complete the above process. It is equipped with necessary finishing, coiling, and transmission devices, as well as auxiliary systems such as pulp supply, pulp and white water circulation, vacuum, ventilation and exhaust, paper loss treatment and lubrication, and self-control. The specifications of paper machines are often expressed by the width of the finished paper they produce (referred to as the width of the paper), the width of the copper mesh, and the preferred operating speed. The width of modern large paper machines can reach 11m, the working speed of the machine can reach over 1000m/min, the daily paper production can reach hundreds of tons, and the weight of the entire machine can reach over a thousand tons, reaching over a hundred meters. Small paper machines are commonly used in developing countries and some specialty paper production, with a width of 1-3m and a working speed of tens of meters to 200 meters per minute.

　　Mesh lining pressing includes two methods, namely lining mesh pressing and sleeve mesh pressing.　　1. Lining net pressing　　Mesh pressing is the process of lining a large plastic mesh inside a pressed blanket, in order to reduce fluid pressure in the pressing area and facilitate dehydration. The use of lining mesh pressing can achieve the goal of increasing the pressure in the pressing zone, improving the dryness of wet paper width, and increasing the speed of the paper machine. However, due to the plastic mesh used for lining and pressing being packed inside the blanket, loading and unloading are more complicated and prone to damage. At the same time, the effect is limited. Therefore, it has not been widely promoted and used.　　2. Net pressing　　Net pressing is the process of placing a net cover on a flat pressing rubber roller or vacuum roller below, and fixing the two ends of the plastic net cover with block or whole ring pressure rings.　　The hardness of the adhesive layer of the net roller should be slightly higher than that of ordinary rubber rollers, generally 95-96 Shore hardness, and the hardness should not be less than 88-90. If the adhesive layer is too soft, the mesh sleeve is prone to deformation. In addition, both ends of the rubber roller should be machined into a circular arc shape with a radius of no less than 12.5mm to prevent cracks or scratches on the mesh sleeve.　　The mesh sleeve used for net pressing is made of double-layer woven single filament plastic mesh with a thickness of 2.25mm, a quantitative amount of about 900g/m2, and a void volume of about 1500cm/m. The dehydration mechanism of net pressing is basically the same as that of groove pressing. Because the mesh sleeve is made of single filament double-layer weaving, the side in contact with the blanket has enough mesh gaps to accommodate the pressed water, and the bottom layer has a channel for flowing water, so the water extracted from the wet paper during pressing is dehydrated in a vertical flow manner.