Since the 20-page book has the commonality of a variety of shaped books, it is important to analyze the imposition principles and imposition techniques of the 20-book book and communicate with peers.
The principle of imposition of 20 books
1. open the printing sheet must not exceed the length of the short side of the press depth and feed effective printing area of the ink
The 20-books are all done by size printing, so the short side length of the large paper is the key to imposition. Only the paper within the effective printing ink area of ​​the printing machine can be printed, so the publishing practitioner first To understand the performance parameters of different presses.
There are two main types of printing machines currently used in China: one type is a web printing machine. This type of printing machine is suitable for large printing and simple folding because of its high speed and the folding function of the conventional format. Opened books (such as teaching materials), and 20-page books are not suitable for printing on web press because of their speciality and folding method is different from regular books; the other is sheetfed printing machine. It is the main model of the printing industry . It is more suitable for printing 20-page books. Due to the variety of sheet-fed printing presses, different types of printing presses have different printing depths and effective printing inking areas. Table 1). Only by knowing the paper feed depth and effective print inking area of ​​different presses can you choose the right model for different sizes of paper.
2. Save money and save time
When publishing a book, the publisher first considers how to save money and save time while ensuring the quality of the book. We can see from the 20-page paper segmentation diagram that there are two printing methods for this type of book, one is the size printing method (as shown in Figure 1, the paper is cut into two sizes), and the other is 3 The printing method (as shown in Figure 2, the paper is cut into 3 pieces of printing), although both printing methods can achieve the purpose of printing books, it is clear that the size printing method is better than the three printing method. Save time and money. This is because when using the size printing method, each side only needs to be printed twice, and the last two times can complete the printing task, and the 3 printing method has to print 3 times on each side and the last 3 times to complete the printing task. Therefore, the size printing method can reduce the printing workload or the machine cost by about 50% compared with the 3 printing method, which is the best choice for printing 20 books.
3. No waste of paper and no impact on the subsequent binding process
We know that the opening of large and small printed paper is unconventional. It cuts the paper into two pieces of paper of different sizes according to the specifications of the book (as shown in Figure 1), so it must be used as long as the material is opened, especially The cut small open paper, as long as it is cut, it becomes a designated product, and it cannot be used in other places. Therefore, it is necessary to calculate the amount of materials before the material is opened to prevent paper waste.
Especially when making 20-page books with odd-numbered printed sheets, improper imposition can easily cause paper waste, or bring trouble to the subsequent binding process, affecting the quality of book binding. So how do you not waste paper on the 20-page book that prints odd-numbered prints by size printing without affecting the subsequent binding? Next we will focus on this issue.
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