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There is a commonly used type of paper in the papermaking process, especially in copying paper technology. Its scientific name is sulfuric acid paper, and it is widely used in the printing and advertising industries. Below is a detailed explanation of the use of sulfuric acid paper.
1. An Introduction to Sulfuric Acid Paper
Sulfuric acid paper is made from natural fibers derived from micro-plant materials. These fibers are processed in a wet state through beating and papermaking without the use of adhesives or fillers. Afterward, the paper is soaked in a concentrated sulfuric acid solution for approximately two to three seconds. It is then rinsed with clean water and treated with glycerin for surface finishing before being dried into a thin, rigid film. The resulting material has a compact structure, good hardness, and slight transparency. It is not breathable, and neither water nor oil can penetrate it, making it highly resistant to moisture and mold. This makes it easy to store over long periods. However, due to its dryness, sulfuric acid paper tends to generate static electricity easily when handled, which can cause multiple sheets to stick together during the printing process.
2. A Brief Description of the Use of Sulfuric Acid Paper
As mentioned earlier, one challenge when printing on sulfuric acid paper is the static buildup that occurs during feeding. To address this, it's important to ensure that the paper is properly dried and that the printing environment maintains suitable temperature and humidity levels. Because the paper is stiff and less flexible, it can be more difficult to separate compared to other papers of similar weight. This may require adjusting the suction and blowing systems on the printing press to improve feeding efficiency.
Additionally, sulfuric acid paper has limited light transmission after printing, leading to various optical effects such as light absorption, reflection, and refraction. This can affect the color perception of printed ink, making the actual color appear different from what is expected. During the printing process, it’s essential to carefully adjust the ink color and dosage. When evaluating the ink color, placing a layer of white paper underneath the sulfuric acid paper can help reduce visual color distortion. It’s also advisable to avoid using dense, fine halftone patterns on sulfuric acid paper with a smoothness below 100 filaments, and to limit the screen count to prevent excessive detail that might not reproduce well.
In summary, this article briefly outlines the key considerations in using sulfuric acid paper. While these details may seem small, they can significantly impact the quality of the final print if overlooked. Paying attention to these nuances in daily production can make a big difference. After all, success often depends on the smallest of details.
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