Reduced amount of air passing through the felt at the vacuum roll and vacuum suction box

Components such as resins, inks, adhesives, and plastics are recycled into fibers, and sulfite wood pulp and mechanical wood pulp are used to produce resins and fatty acids. In addition, filler chemicals such as rosin gum, defoamers, wet strength agents, retention aids, and resin control agents also contain many organic components. Fiber debris attached to the carpet, because it usually contains water-insoluble substances such as resin and rosin gum, is difficult to remove chemically. Inorganic adherents include fillers such as china clay, calcium carbonate, titanium dioxide, insoluble oxides and hydroxides, as well as phosphates, silicates and sulfates. The main problem caused by dirty blankets is the appearance of streaks on the surface of the blanket, causing uneven moisture in the paper banner. The dirt on the felt surface causes carpet marks or pinholes on the surface of the sheet. As the air permeability of the blanket decreases and the amount of air passing through it decreases, the pressure difference between inside and outside will increase significantly after running to the position of the vacuum suction box, resulting in increased wear of the felt. The air permeability of the blanket is reduced, the effective volume of water is reduced, the amount of water in the blanket in the nip decreases, and the sheet is easily crushed. After the gap is clogged, the amount of air passing through the felt at the vacuum roll and vacuum suction box decreases, causing the felt to fail to remove water.

Reasonable selection and configuration of washing equipment High-speed paper machines generally need to be equipped with chemical cleaning spray, high pressure needle-type swing spray, low-pressure fan-shaped lubrication spray and edge lubrication spray. The chemical cleaning spray pipe shall be installed on the side of the felt contacting paper sheet at the position after the blanket is out of the pressure zone. The function is to spray the chemical detergent on the surface of the blanket and remove the fine stuffing and adhesives through the chemical reaction; The subsequent high-pressure showers use sufficient water pressure to disperse the fine fibers, fillers, and adhesives on the surface of the carpet during high-speed operation to facilitate removal in the subsequent process; low-pressure fan-shaped lubrication spray hoses should be used in high-pressure spraying. After the shower pipe, its role is to scour and dilute the dirt that is dislodged by the high-pressure water so that it can be sucked by the vacuum suction box.

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