The cover is the face of a book. A good print cover will entice readers to buy. The quality of cover printing is of great significance to the social image of books. So, what should pay attention to in custom book cover printing? Let’s find out together.
In the printing process. The basic rule is that the rules must position. Especially the album cover printing. Not only printing color requires stability. And because the post-press processing technology often has special processes. Such as lamination, hot stamping, and UV glazing. Thus, the requirements for process stability are higher.
- 1. Hot stamping
Because the hot stamping content of the cover is not matched with the content. Thus, slight changes in printing rules do not greatly affect the quality of hot stamping. There is a certain correspondence between the hot stamping content and the content. Thus, the ruled edge of hot stamping must be the ruled edge of printing. Thereby ensuring the consistency of the hot stamping position of the same batch of jobs.
- 2. UV coating
The rules of the UV coating plate must be consistent with the printing rules. The graphic content needs to be coated with UV varnish. Has partial matching requirements with the printed content. Thus, the requirements for fitting errors are particularly high. The general need is around 0.01mm. Since the cover paper is sometimes made of a loose special paper. It is easy to deform during printing. This puts forward higher requirements for UV coating registration in the post-press process. Thus, the printing rules and the rules in the UV coating process must unify. If there is a phenomenon of jumping rules (rules are unstable) during the printing process. In UV glazing, the printed products must classify according to the jumping rules. Coating in batches and adjusting the position of the UV coating plate.
- 3. Hot stamping + embossing
If it is necessary to emboss the content of the book after hot stamping in the post-press process. Two special crafts need to superimpose the same content in the same location. This requires that the fit error be less than 0.01mm. Thus, the hot stamping rules, embossing rules, and printing rules must be consistent.
- 4. UV glazing + embossing
The superposition of these two crafts also has very strict requirements on the rules. , generally, UV glazing first and then embossing. Registration errors during UV coating may not be noticeable. It is due to the bulge of the embossed content during the embossing process.
Matters needing attention in book cover printing
(1) The basic weight of the main used paper for general covers is above 157g/m2. The weight of the special paper is also above 135g/m2. Due to the thicker paper, especially the special paper. The water absorption changes during printing and pressing. During printing, the paper is large. The accuracy of the positioning of the side-drawing paper is particularly important. Generally, hardcover books have special post-press processes. Such as hot stamping, embossing, debossing, and UV glazing. Thus, the control of printing rules and paper deformation. It is very important to match the rules in post-press special process production.
Because the same pattern on the cover may need two or three post-press processing. This requires many positioning processes. Thus, the content needs to process after printing. It should keep close to the rule edge as much as possible. In this way. It is easy to make the position of the edge ruler positioned after printing. Consistent with the position of the printing edge ruler. And more accurate.
(2) When cutting paper, it must be accurate, neat, and free of minor mistakes. The position of the jaws and the trimming of the sides should be standard and neat. To ensure the correct positioning of the rules when printing book covers.
Strict control of the printing process. One is to ensure the balance of ink and ink. Under the premise of ensuring the printing quality. The smaller the water volume, the better. Prevents paper from deforming due to excessive water absorption. The second is to control the temperature and humidity of the workshop. The temperature is 20-25°C, and the humidity is 60%-70%. Third, in the printing process. Side rules and bottom rules must be stable. Fourth, the color of the entire batch of covers should be consistent.