During the papermaking pulping process, due to reasons such as pulping raw materials, high-molecular substances like cellulose, and various added chemical agents, a large amount of stable foam is often generated in the mixing and flow delivery treatment of the pulp, which brings many unnecessary troubles to various subsequent processes (washing, transportation, bleaching, alkali recovery, etc.). Defoamers specifically are used in the pulping process of the papermaking industry. Their main function is to eliminate and suppress the foam generated during the pulping process to ensure the smooth progress of production and the improvement of product quality.
Defomaers usually have the following characteristics:
1.Superior performance under high-temperature and strong-alkali conditions: They can quickly defoam under the harsh conditions of high temperature and strong alkali and have a lasting anti-foaming effect.
2.Low dosage: Only a small amount of addition is needed to maintain good continuous defoaming ability, which is cost-effective.
3.Good emulsion stability: They are not easy to adhere to equipment and wire cloth, improving the operating efficiency of equipment as well as the sizing rate and cleanliness of products.
4.Good miscibility: They have good miscibility with black liquor and are suitable for the production conditions of pulp mills.
5.Improve rinsing efficiency: They contribute to the dehydration process, reduce the moisture content of pulp, and lower the energy consumption in the evaporation process.
6.Meet environmental protection requirements: They reduce the usage amount of bleaching chemicals, which is conducive to meeting environmental protection requirements.
Defoamers are crucial for ensuring the production efficiency and product quality of the papermaking industry. They can quickly defoam under high-temperature and strong-alkali conditions, suppress foam for a long time, improve the operating efficiency of equipment as well as the sizing rate and cleanliness of products, while also saving the production costs and energy consumption of pulping enterprises. Correct selection and use of defoamers can effectively solve the foam problem in the pulping process and improve the quality of paper.
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