In the paper industry, after a series of complex processes such as mixing, screening and pulp breaking, a large number of foam are often produced. These foam not only affect the fluidity and uniformity of pulp, but also directly affect the quality and production efficiency of final paper. Therefore, as an indispensable chemical additive, paper defoamers play a crucial role in the paper industry.

The main function of paper defoamer is to reduce the surface tension of liquid, destroy the stability of foam, and make it break and dissipate rapidly. In the papermaking process, the foam in the pulp mainly comes from a variety of added chemical aids, such as filter aid, retention aid, wet strength agent, sizing agent, etc. These additives are prone to generating bubbles during the beating and closed cycle of white water, and due to the presence of fine solid substances such as fibers and pigment fillers in the slurry, the adsorption and stabilization of bubbles become more complex. Paper defoamers, through their unique defoaming mechanism, can effectively control the generation and accumulation of bubbles, maintaining the uniformity and fluidity of pulp.

The existence of foam will seriously affect the quality of paper. On the one hand, the bubbles in the foam are mixed in the pulp, which is easy to form defects on the paper surface, such as bubbles, spots, etc., affecting the appearance and uniformity of the paper. On the other hand, foam can also reduce the strength and durability of the paper, making the paper easy to break or break in the subsequent processing and use. The use of defoamer in papermaking can significantly reduce the generation of foam, ensure the uniformity of pulp, and thus improve the overall quality of paper.

In paper production, the production of foam not only affects the quality of paper, but also adversely affects production equipment. The foam is easy to block the pipeline and network, reduce the operating efficiency of the equipment, and increase the production downtime. By adding paper defoamer, the generation of foam can be effectively controlled, the stable flow of pulp can be maintained, the frequency of equipment maintenance can be reduced, thus improving production efficiency and reducing production costs.

In addition, the use of defoamers in papermaking also contributes to environmental protection and sustainable development. In the process of papermaking, excessive production of foam not only affects production efficiency, but also may lead to waste of resources and environmental pollution. By using defoamers, the generation of foam can be reduced, and the foam content in wastewater can be reduced, thus reducing the impact on the environment. At the same time, with the advancement of technology, more and more environmentally friendly paper defoamers have been developed. These products not only have excellent defoaming effects, but also have characteristics such as low toxicity and low VOC, which are more in line with the concept of modern green manufacturing.

In the paper industry, selecting appropriate defoamers is crucial for ensuring paper quality and production efficiency. Different types of defoamers have different characteristics and applicable ranges, so it is necessary to choose the appropriate defoamer according to specific production processes and paper quality requirements. The commonly used paper defoamers in the current market mainly include kerosene, oil esters, fatty alcohols, polyethers, and organosilicon. Kerosene defoamers can eliminate foam on water surface, but their ability to remove gas from slurry is poor and may affect sizing effect; Oil ester defoamers also have problems such as poor degassing effect and affecting sizing; Polyether defoamers are easily affected by temperature and their defoaming effect is unstable; Although organosilicon defoamers have good defoaming effects, they are used in large quantities and have poor economic viability. In contrast, fatty alcohol defoamers have become the ideal choice of defoamers in the current paper industry because they can quickly remove the gas in the pulp and eliminate the foam on the water surface, and have the smallest impact on sizing and low use cost.

When using paper defoamer, the following points should be paid attention to: first, fully mix the lotion or powder defoamer to ensure its uniform dispersion in the pulp; Secondly, the appropriate amount and point of addition should be determined based on the production process and paper quality requirements; Finally, attention should be paid to the stability and compatibility of defoamers to avoid adverse reactions with other chemical additives.

In short, paper defoamers play an indispensable and important role in the paper industry. It not only improves paper quality and production efficiency, but also contributes to environmental protection and sustainable development. With the continuous advancement of technology and the continuous development of the market, we believe that there will be more efficient and environmentally friendly paper defoamers in the future, bringing broader development prospects to the paper industry.