Application of acid-resistant defoaming agent in papermaking

Paper coating is a crucial step in the papermaking process. It enhances the paper's gloss, smoothness, and print quality by applying a special coating material to the paper surface. Coating materials typically include resins, adhesives, and fillers, which are evenly applied to the paper surface through a precise coating process. This not only improves the paper's appearance but also enhances its water and tear resistance, making it more suitable for applications such as printing, packaging, and writing. Therefore, paper coating technology plays a vital role in improving the quality and versatility of paper.

• Dissolved gases in the coating liquid: Dissolved gases in the coating liquid may be released from the liquid during coating, forming bubbles.
• Particulate matter in the coating liquid: If the coating liquid contains particulate matter, these particles may form bubbles during the coating process.
• Excessive viscosity of the coating liquid: When the viscosity of the coating liquid is too high, bubbles may form during the coating process. 4. Excessive coating speed: If the coating speed is too fast, the coating liquid may not fully adhere to the paper surface, resulting in bubbles.

Coating equipment issues: Improper design or operation of the coating equipment may also cause coating bubbles.

If bubbles are not promptly eliminated during paper coating, what adverse effects will they have on production and operation?

• Reduced product quality: Bubbles can cause unevenness on the paper surface, affecting printing quality and the appearance of the paper product.
• Reduced production efficiency: Bubbles can lead to production downtime and cleaning, affecting production efficiency.
• Energy waste: Bubbles increase energy consumption during the drying and heating processes, resulting in energy waste.
• Resource waste: Bubbles can increase scrap rates, resulting in wasted resources and increased costs.
• Environmental impact: Bubbles can cause wastewater to contain hazardous substances, polluting the environment. 

The acid-resistant defoamer developed by Nanhui Defoamer Research Institute uses special silicone polyether as the main material and is compounded with additives with high efficiency and good dispersibility. It is a new type of defoamer for pulp. It is characterized by high temperature resistance and strong alkali resistance, and can defoam and inhibit foaming under high temperature and strong alkali.