In recent years, with the popularization of four-color machines and multi-color machines, most of the multi-color printing work is completed on the multi-color machine at one time, which greatly improves the production efficiency and printing quality. Jobs that can only be completed by "pipelining". For example, some five-color prints need to be overprinted with spot color inks such as gold or silver on a large area of ​​dark ground. The ink color is thick and bright, and the gold and silver inks should have a strong metallic luster. If such jobs are printed at one time using a five-color offset press, it is actually more difficult to achieve the desired results. As we all know, multi-color offset presses are "wet-on-wet" overlays, and dark solids are often two-color or even multi-color overlays. The ink layer is relatively thick, and printing is inherently difficult, plus It is more difficult to stack gold and silver ink on it. Because the transferability and adhesion of gold and silver inks are relatively poor, overprinting onto thick and wet ink layers is prone to imprinting defects and the loss of metallic luster of gold and silver inks. There will also be a phenomenon of "reverse overprinting". In addition, because the chemical properties of gold and silver inks are unstable and the transferability is poor, printing in the "wet pressure wet" state must reduce the speed of the printing press, which greatly affects the production efficiency of the multi-color machine. Most printing companies will try to avoid such low-efficiency and poor-quality printing methods. Generally, two printing methods are used. After the four-color ink printed first is dried and then printed on the machine, the gold and silver inks are printed, and the quality can be obtained. Very good guarantee. However, if a four-color machine is used to print twice, there will be several color groups "run empty", which is too wasteful and less efficient. Therefore, a four-color machine and a single-color machine are generally used in the "flow operation" production mode, which not only ensures the printing quality but also improves the production efficiency of the four-color machine. In terms of the combination of printing machines, in order to ensure the accuracy of overprinting, especially for the difficult printing of overprinting, the author still advocates choosing the same type of monochrome machine and four-color machine for use. However, we have also tried different combinations of offset presses. For example: after printing by Heidelberg four-color machine, it is also good to print gold and silver ink with one "08" machine. For thicker cardboard-like prints, the "print" changes more, so it is more difficult to control, and must be paid enough attention. Although the "printing operation" of the offset press has certain difficulties, as long as it is bold to explore and dare to practice, it can be completely mastered.
A bookcase, or bookshelf, is a piece of furniture with horizontal shelves, often in a cabinet, used to store books or other printed materials. Bookcases are used in private homes, public and university libraries, offices and bookstores. Bookcases range from small, low models the height of a table to high models reaching up to ceiling height. Shelves may be fixed or adjustable to different positions in the case. In rooms entirely devoted to the storage of books, such as libraries, they may be permanently fixed to the walls and/or floor.
A bookcase may be fitted with glass doors that can be closed to protect the books from dust or moisture. Bookcase doors are almost always glazed with glass, so as to allow the spines of the books to be read. Especially valuable rare books may be kept in locked cases with wooden or glazed doors. A small bookshelf may also stand on some other piece of furniture such as a desk or chest. Larger books are more likely to be kept in horizontal piles and very large books flat on wide shelves or on coffee tables.
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