Paper coating defoamer is the foam nemesis of paper coating process

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Paper coating defoamer is the foam nemesis of paper coating process
By : Zilibon Chemical

2025/4/9
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In the papermaking industry, paper coating is a key link to improve the performance and quality of paper. By evenly applying a layer of coating on the surface of paper, the appearance, printability, water resistance and many other properties of paper can be significantly improved. However, in the process of paper coating, foam problems often follow, bringing many challenges to production. Paper coating defoamer plays a vital role as a right-hand man to solve this problem.

The generation of foam in the paper coating process is the result of the combined effect of multiple factors. First of all, from the perspective of the composition of the coating itself, the coating coating usually contains multiple ingredients such as pigments, adhesives, and additives. Among them, some additives such as dispersants and thickeners play an important role in the stability and fluidity of the coating, but most of them are surface active and can easily reduce the surface tension of the coating, making it easier for air to form bubbles in the coating and exist stably.

Paper coating defoamer mainly works in two ways. On the one hand, the active ingredients in the defoamer have a lower surface tension than the coating, and can quickly migrate to the foam surface to form a new low surface tension film on the foam surface. This film will destroy the original surface tension balance of the foam, thinning the liquid film on the foam surface and eventually breaking it, thereby achieving the purpose of defoaming.

Paper coating defoamers play an indispensable role in the coating process of the papermaking industry. It is a key auxiliary agent to solve foam problems, ensure coating quality, and improve production efficiency. With the continuous development of papermaking technology and the increasing requirements for paper quality, paper coating defoamers will also continue to innovate and upgrade to better meet the needs of the industry and provide strong support for the sustainable development of the papermaking industry.
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