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  • Defoamer for paper sizing agent: ensure smooth paper sizing process

    By : Zilibon Chemical
    2024/11/19
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    In the papermaking industry, sizing is an indispensable link. Sizing can improve the printability, writing performance and durability of paper. In the process of paper sizing, the generation of foam is a common phenomenon. At this time, defoamer for paper sizing agent has become a key item to eliminate foam.

    The chemical properties of the sizing agent itself and the mechanical stirring during the sizing process are the main reasons for the generation of foam. Excessive foam will interfere with the uniform distribution of the sizing agent on the paper fibers. However, the presence of foam may cause the sizing agent to be wrapped in the foam, resulting in some paper fibers being unable to be effectively sizing, thereby reducing the water resistance of the paper.

    One of the working principles of defoamer for paper sizing agent is to reduce surface tension. The defoamer molecule has a special structure, and its lipophilic group and hydrophilic group can be arranged in a directional manner on the surface of the foam film. When the defoamer is added to the pulp containing the sizing agent, it can reduce the surface tension of the foam film and make the foam film unstable.

    Defoamers for paper sizing machines can also destroy the elasticity of the foam film. It can penetrate into the foam film, interact with the molecules in the foam film, disrupt the arrangement of the molecules inside the foam film, and make the foam film lose its elasticity. Once the foam film loses its elasticity, the foam will quickly break under the action of external pressure or its own gravity, thereby achieving the purpose of defoaming.

    Defoamers for paper sizing agents play a vital role in the papermaking industry. With the continuous development of papermaking technology, their performance and functions will continue to be optimized and upgraded. Future defoamers will develop in the direction of low toxicity and biodegradability to reduce the impact on the environment.
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