Requirements for book printing paper
The quality of printing paper is an important condition in order to print high-quality books and magazines with pictures and texts. Although it has an important relationship with equipment, inks, and operational requirements and links, the final printing effect still needs to appear on the paper.
At present, book printing has developed to high-speed and multi-color, and many high-end books are also using offset printing paper. As long as paper is used properly, offset printing paper can also print high-quality products that meet customer requirements. However, as far as the current research and analysis of a large number of books and periodicals products is concerned, there are indeed some products with different degrees of imaginary, flower, paste, and lack of strokes. The image dots are not full, the uniformity is poor, and the edges are incomplete. The background color is faint, not uniform. In the field, the large title word is not full, the print is serious, and there are quality defects such as powder drop, hair loss or black spots on the paper itself. These defects directly affect the stable improvement of the quality of book printing. The existence of these outstanding quality problems is actually related to the poor quality of paper, poor printability and insufficient production control.
In terms of the printability of printing paper, it is not enough to simply print the product through the printing press. Book printing paper should also have excellent surface strength, ideal ink absorption characteristics, good tensile strength, good flatness uniformity, uniform whiteness, and no serious offset, powder, lint, no obvious black. Defects such as spots. Only in this way can the demand for high quality prints be met.
The stiffness and surface strength of the paper are related to the degree of sizing of the paper, and the degree of sizing is related to the quality of the printed product. The correct sizing degree can increase the paper strength appropriately, which not only reduces the phenomenon of “leaf edge†caused by environmental influence, but also avoids the pleating phenomenon in the printing process, and also helps the imprinted ink to be full, clear and uniform. The good strength of the paper surface plays an important role in reducing the offset.
Book printing paper should have good ink absorption and non-diffuse properties. The characteristic of offset printing is ink printing by the principle of oil and water repelling. The printing dampening requires a small amount of water, and most of this small amount of water penetrates into the paper and is volatilized by the printing pressure. During the printing process, the ink is also infiltrated into the paper by the printing pressure after the ink is applied, and the conjunctiva is dried on the surface. This drying process is quickly completed by air conditioning to obtain a print that is not dirty. Therefore, printing paper is required to have good absorption characteristics for water and ink. It is good for the imprinted ink to be full, thick and even, without causing serious defects such as imprinting diffusion, and obtaining high quality products with beautiful text and clear images.
Book printing paper should also have good tensile strength. Paper with good tensile strength can not only pass through the printing machine smoothly, but also help the paper to maintain balance during operation, to the page code, accurate overprinting, no pleats in printing, and paper not to be torn. Especially for high-speed rotary printing, it is important to keep the paper path balanced operation and page number accurate.
Printing companies should pay attention to the selection of books and printing papers, improve the selection and control of the main raw materials for printing, strengthen the on-site management of the printing process, and adjust the machine pressure for the printing suitability of the paper, adjust the ink and water balance, control Good amount of ink, etc.
Practice shows that one of the most important aspects of printing high-quality books and periodicals is the need to improve and improve the quality of books and periodicals, and to lay a good foundation for the printing of high-quality books and periodicals. Therefore, paper mills need to further understand and clarify the printing suitability of offset printing, as well as the necessary conditions and requirements of paper, only in this way, will be beneficial to continuously improve the quality of paper and improve the stability of paper printing. Prerequisites for improving the quality of book printing products.
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