What is the role of light calcium carbonate in the paper industry?

time:2021/5/19 10:11:49    Views:

The latest research progress in the application of light calcium carbonate in PCC of papermaking industry refers to a product prepared by chemical synthesis. It is the introduction of carbon dioxide into lime water or directly deposited under the effect of sodium carbonate solution and lime water. Light calcium carbonate is superior to heavy calcium carbonate in mass. Its particles are fine, porous and have a narrow particle size distribution. It has the advantages of fine particle size, high whiteness, low price, low foaming and good printing adaptability. Very suitable for paper filler, basically meet the requirements of paper printing and optical properties. Therefore, light calcium carbonate is used as a filler for some high grade paper. By comparing the effect of adding light calcium carbonate and kaolin on the quality and performance of base paper, it was found that the super calenishing paper with light calcium carbonate had higher whiteness and opacity, while the printing parameters, such as smoothness, paper gloss, printing gloss and lint removal, were close to that of kaolin. Perhaps the problem is the potential impact of light calcium carbonate's high-altitude ground rate on printing concentration, ink demand, and printing uniformity. Jia Tianxiang's research found that light calcium carbonate can improve and improve the whiteness, smoothness, appearance strength and ink absorption of coated paperboard.

The whiteness, opacity, loose thickness, evenness and smoothness of the electrostatic carbon paper filled with light calcium carbonate have been improved greatly, the printability of the paper has been improved, the ash content of the paper has been added, and the stability of the paper has been improved. Yong-shun liu and other research found that adding light calcium carbonate light weight printing paper has high volume of paper and opacity, good printing performance, good paper evenness and fineness, falling paper glare, progress paper ash, smooth degree and shape stability, but unfavorable to the sizing of paper strength, tensile strength, and appearance. Zhang Yang's research found that light calcium carbonate can partially replace calcined kaolin for carbon-free carbon carbon paper, which is conducive to saving the cost of paper making. There is no binding force between light calcium carbonate and pulp fiber, resulting in low retention rate. Therefore, light calcium carbonate usually needs to be modified before use. The modification of light calcium carbonate can be divided into two processing processes: dry and wet. The wet modified product has good quality and less active agent. However, when modifying agents that are easily hydrolyzed or insoluble in water are used, a dry modification process is needed. Dry modification surface treatment is simple, easy to industrial production, is now widely used method.

Related news