Digital printing has become a rapidly growing industry, with an increasing demand for digital printing papers. These papers, also known as electronic printing papers, are primarily uncoated but are gradually transitioning to coated fine paper grades. However, the production speed of digital printing systems is currently limited due to insufficient computing power. Fortunately, this issue is expected to be resolved in the near future, which will greatly impact the development of the printing industry as a whole.

Digital printing technology is not a singular process, as different manufacturers utilize various methods. The major categories of nonimpact printing include electrical charge-based methods, magnetic methods, thermal methods, and ink-jet methods. Each printing method has specific requirements for the type of paper used.

In electrophotography, the runnability of the paper is crucial. The paper must have sufficient electrical conductivity and resistivity. Additionally, moisture content and friction are important factors to consider. Other essential characteristics include good dimensional stability to prevent curling and cockling, surface strength, and surface smoothness, especially for high-resolution printing.

In ink-jet printing, papers must possess specific characteristics that match the inks and drop volumes used. The paper must be smooth and have even porosity with small pores to absorb the solvent quickly and counteract spreading. Dimensional stability, as well as the tendency to curl and cockle, are also significant considerations. Digital printers have reported problems with paper, such as static electricity with coated papers and films, curling and moisture issues, and difficulties cutting heavier weights.

While paper costs play a minor role in digital printing, the overall product costs consist mainly of inks, special films, and the printers themselves. These costs typically do not decrease as the number of printed copies increases. Furthermore, the recycling and decolorization of digital papers present ongoing challenges that have not yet been solved.

To ensure compatibility with their machines, printing machine suppliers typically certify the papers accepted for use. Digital printing is commonly used for manuals, price lists, various direct mail materials, as well as low-volume paperbacks and hardcover books. Currently, black-and-white applications account for more than 80% of the digital paper market. The basis weights of digital printing papers vary significantly, ranging from 40 to 400 g/m2.

In conclusion, the demand for digital printing papers is growing rapidly, and advancements in computing power will overcome the current bottleneck of production speed. The expansion of digital printing will have a significant impact on the entire printing industry and the overall value chain. However, challenges remain in terms of paper characteristics, recycling, and decolorization. As the industry continues to evolve, it is essential for manufacturers and suppliers to address these issues to further enhance the digital printing experience.