Precipitated silica is widely used in the papermaking industry and has a significant effect on improving paper performance. The following are several main aspects of precipitated silica improving paper performance in the papermaking industry:

1. Improving paper's resistance to ink penetration
As a paper filler, precipitated silica can effectively enhance paper's resistance to ink, reduce the penetration and diffusion of ink on the paper surface, and thus improve the clarity and neatness of printed products.

2. Enhance paper mechanical strength
Adding precipitated silica can increase the mechanical strength of paper, such as tensile strength and burst resistance. This helps to improve the durability of paper during processing and use, and reduce the risk of breakage and tearing.

3. Increase paper whiteness
Precipitated silica itself is a white powder, and its uniform distribution in paper fibers can significantly improve the whiteness of paper, making the paper whiter and more beautiful.

4. Reduce the unit weight of paper
By adding an appropriate amount of precipitated silica during the papermaking process, the unit weight of paper can be reduced while maintaining the physical properties of paper, thus achieving lightweight paper. This helps to reduce production costs and improve resource utilization efficiency.

5. Improve the feel and gloss of paper
The addition of precipitated silica can also improve the feel and gloss of paper, making the paper smoother and more delicate, and improving user experience.

6. Reduce costs and improve production efficiency
The production cost of precipitated silica is relatively low, and it is easy to combine with the papermaking process. Therefore, the use of precipitated silica as a paper filler helps to reduce production costs while improving production efficiency and product quality.

In summary, the application of precipitated silica in the papermaking industry can significantly improve many properties of paper, including anti-ink penetration, mechanical strength, whiteness, unit weight, feel and gloss. These improvements not only improve the quality and market competitiveness of paper, but also promote the sustainable development of the papermaking industry.