Defoamer, as its name implies, is a chemical substance that can effectively inhibit and eliminate foam in liquid. Defoamers play a crucial role in the paper industry. Due to the large amount of water and chemical additives involved in the papermaking process, these ingredients are prone to produce foam in the mixing, pumping, coating and other links, affecting the quality and production efficiency of paper. Defoamer can quickly dissipate foam by destroying its surface tension, thus ensuring the smooth progress of papermaking process.

The papermaking process is complex and fine. From pulp preparation, paper machine molding to post-treatment processing, every step may be interfered by foam. Foam will not only lead to uneven paper surface and reduced strength, but also may block equipment, increase energy consumption and cleaning costs. Therefore, effective control of foam is an important link that cannot be ignored in paper production.

There are various types of defoamers for papermaking, which can be divided into organic silicon, mineral oil, polyether, etc. according to their composition. Various defoamers have different characteristics, such as silicone defoamers that are resistant to high temperatures, acid and alkali, and suitable for high-temperature cooking and other processes; Mineral oil defoamers have good dispersibility and wetting properties, and are suitable for the slurry preparation stage. The selection of suitable defoamers should be determined based on specific process conditions and requirements.

When selecting paper defoamers, multiple factors need to be considered comprehensively, including defoaming effect, stability, impact on paper quality, environmental friendliness, and cost. The defoaming effect is the primary consideration, but at the same time, it is necessary to ensure that the defoamer does not introduce new pollutants or affect the physical and chemical properties of the paper. With the increasingly strict environmental regulations and the improvement of consumer environmental awareness, environmentally friendly defoamers have become an inevitable trend in the development of the industry. This type of defoamer has the characteristics of low toxicity and biodegradability, which can reduce environmental pollution and ecological damage.