As an important part of the traditional manufacturing industry, the paper industry often faces the problem of foam in its production process. Foam not only affects the quality and production efficiency of paper, but also may cause damage to equipment and increase maintenance costs. Therefore, the application of defoamers in papermaking is particularly important.

In the paper making process, the formation of foam mainly comes from the surfactant in the pulp, the additives added, and the physical operations such as mechanical stirring and cooking. Under the interaction of these components, it is easy to form a stable bubble layer, and then aggregate into foam. Especially in the key processes of pulping, bleaching and paper making, the foam problem is particularly prominent.

Paper defoamers mainly function through the following mechanisms:

1、 Destroy the stability of foam: Defoamer molecules can quickly penetrate into the interior of foam, reduce the surface tension of bubble membrane, and make bubbles easy to break.

2、 Inhibition of foam regeneration: some defoamers can form a film in the slurry to prevent the formation of new bubbles.

3、 Improve production efficiency: the application of defoamer can reduce the equipment downtime caused by foam, and improve the continuity and stability of the production line.

4、 Improve paper quality: By controlling foam, defoamers can help reduce holes, spots and other defects on the paper surface, and improve the uniformity and gloss of the paper.

When selecting defoamers for papermaking, consideration should be given to selecting the most suitable type of defoamer based on the specific requirements of the papermaking process and the characteristics of the pulp. Choose non-toxic, harmless, and biodegradable defoamers to reduce potential harm to the environment and human health. Ensure that defoamers have good stability during the papermaking process and are not easily degraded or ineffective by the components in the pulp. On the premise of ensuring effectiveness, consider cost-effectiveness and choose products with high cost-effectiveness.

The green and sustainable development path of papermaking defoamers is one of the important ways for the papermaking industry to achieve transformation, upgrading, and sustainable development. In the future, with the increasing awareness of environmental protection and the continuous development of technology, paper defoamers will become more environmentally friendly, efficient, multifunctional, and intelligent. This will help promote the development of the paper industry towards green, low-carbon, and circular directions, and make positive contributions to achieving sustainable development goals. At the same time, paper companies should actively respond to national environmental policies, strengthen technological innovation and product research and development, and promote the green and sustainable development of paper defoamers.