What are the characteristics of paper defoamer?


The process of papermaking is divided into two main steps. One is washing, two is papermaking. No matter what the step is, it is inevitable that bubbles will be created. Therefore, defoamer should be used for disposal.


In the process of pulping, the slurry contains fatty acids, resin acids and other natural substances. After cooking liquid and chemical washing, fatty acid soap, fatty acid soap and other foaming substances will be generated. A large amount of foam will cause some trouble for subsequent cleaning and transportation and bleaching, resulting in a decline in pulp quality. Therefore, defoamers should be used. Handle. The defoamer used in the pulping process is mainly divided into two categories: hydrocarbon defoamer and silicone emulsion defoamer. This kind of defoamer can quickly remove the foam produced by lignin and some surfactants, especially when it is used for pulping and washing.


For the papermaking process, if we do not solve the bubble generated during the papermaking process, we will cause breakage of paper, white water level fluctuation and pump frequency fluctuation, which will directly affect the stability and quality of paper production. The paper defoamer can effectively inhibit the foaming of white water. At the same time, the fine bubbles on the surface of fibers and the foams on the slurry can be eliminated. The defoamer can also dissolve the air in the pulp and eliminate the bubbles on the water surface, thus avoiding the formation of voids, reducing the overflow of paper breakage and pulp storage tank, thus ensuring the loss of pulp fibers and chemicals, and improving the uniformity and quality of paper.


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