Water is indispensable in the entire production process of the pulp and paper industry.
Whether the water quality is good or not has a certain impact on the quality of pulp and paper. Capacitor paper, electrical insulation paper, photo paper and rayon pulp, etc., need to be higher than the general production water requirements.
In particular, capacitor paper and electrical insulation paper are produced with water treated with cation and anion exchange resins.
For boiler water, the required quality is even higher. Because hard water will foul the boiler and affect heat transfer. The oxygen, carbon dioxide and chloride ions in the water have an erosive effect on the boiler wall. The content of these impurities is slightly higher, which is detrimental to the operation of the boiler.
Therefore, boiler water must be softened, deoxygenated, and desalted to ensure that its quality meets boiler water standards.
The high content of impurities in the water has a certain impact on the quality of the pulp and paper. For example, the high content of suspended matter, in addition to increasing the dust of the paper, will also reduce the whiteness and strength of the paper.
High hardness in water is not good for sizing paper. The main reason is that when the calcium and magnesium salts are too high, these salts will interact with some rubber compounds, causing the loss of rubber compounds.
In addition, the alkaline pulp is washed with hard water. The calcium, magnesium ions and the dissolved resin in the black liquor produce insoluble calcium soap or magnesium soap, which is adsorbed or deposited on the fiber, which causes difficulty in bleaching. Resin barriers.
The water contains metal ions such as iron and manganese, which will be adsorbed on the fiber during the pulping and papermaking process, causing discoloration of the paper or pulp. Therefore, in general high-grade paper, the iron content in water is not more than 0.1-0.2 mg / L.
If the original paper is photographed, if the iron content is high, the paper will produce yellow rust spots, which seriously affects the use requirements. If the chloride ion content in the water is too high, the manufacture of some high-grade paper or neutral packaging paper and anti-rust base paper, etc., will cause corrosion of the packaged metal products.
Organic matter often exists in water in a colloidal or dissolved state. This is caused by the decay of organic matter such as the pollution of the water source through the water flow zone and the growth of algae in the water. It causes water color, turbidity, and even odor, so when used in pulp and paper, the fiber will strongly adsorb organic pigments or gums. Such as alum treatment will cause these substances to precipitate on the pulp, thereby reducing the whiteness of the pulp or affecting the bleaching process.
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