How to ensure the accuracy of the cover printing rules

In the printing process, the most basic requirement is that the rules should be accurately positioned. Especially when printing the cover, not only the printing color is required to be stable, but also because the post-press processing often has special processes such as lamination, hot stamping, UV glazing, etc., the stability requirements for the rules are higher.

The importance of the rules

1. Hot stamping rules

Since the hot stamping content of the cover is generally not matched with the printed content, the slight change of the printing rules has no particular effect on the quality of the hot stamping, but the hot stamping content has a certain correspondence with the printed content, so hot stamping is required. The rule side is the rule side of the print, thus ensuring the consistency of the hot stamping position of the same batch of jobs.

2.UV glazing rules

The rules of the UV glazing plate should be consistent and matched with the printing rules. The graphic content of the UV varnish is generally required to be partially combined with the printing content, so the tolerance for the fitting error is particularly high, and the general requirement is about 0.01 mm. Since the cover paper sometimes uses relatively loose special paper, the printing is extremely easy to deform, which puts higher requirements on the UV glazing in the post-press process, so the printing rules and the rules in the UV glazing process must be To be unified. If there are jumping rules (unstable rules) during the printing process, the UV glazing must be carefully classified according to the jumping condition, glazing in batches, and adjusting the position of the UV glazing plate.

3. Hot stamping + punching rules

If the post-printing process needs to be stamped after the hot stamping of a certain print content, it is necessary to superimpose two special processes on the same content in the same position. This requires that the nesting error be less than 0.01mm, so the stamping rules, the punching rules and the printing rules must be consistent.

4.UV glazing + bumping rule

The superposition of these two processes is also very strict on the rules. Generally, the UV glazing is performed first and then the embossing is performed. The error of the fitting in the UV glazing process may make the UV glazing error side less obvious in the squeezing process due to the protrusion of the slanting content.

Cover printing precautions

The common paper for general cover is more than 157g/m2, and the weight of special paper is also above 135g/m2. Due to the thicker paper, especially the change of water absorption of the special paper during printing and pressing, the deformation of the paper in printing is large, and the accuracy of the positioning of the paper while the rule is particularly important. General fine books have special post-printing processes such as hot stamping, embossing, embossing, UV glazing, etc. Therefore, it is important to control the printing rules and paper deformation and the rules in the special post-press manufacturing process.

(1) Since the same pattern on the cover may need to be processed twice or three times, this requires multiple positioning processes. Therefore, the content that needs to be processed after printing should be as close as possible to the rule side. It is easy to make the position of the side gauge of the post-press positioning consistent with the position of the printing edge gauge.

(2) When cutting paper, it is required to be accurate, tidy, and small in error. The cutting position and edge cutting should be standardized and tidy to ensure accurate positioning of the cover when printing.

(3) Strictly control the printing process. First, to ensure the balance of ink and water, under the premise of ensuring the printing quality, the smaller the water, the better, so as to avoid the paper being deformed due to excessive water absorption; the second is to control the temperature and humidity of the workshop, the temperature is 20 ~ 25 ° C, the humidity is 60. %~70%; Thirdly, the edge gauge should be stable during the printing process, and the bottom gauge should be stable; Fourth, the color of the entire batch of covers should be consistent.

It can be seen from the above that the implementation of post-press processing is inseparable from the pre-production and design, and it is also inseparable from the precise control of the printing process, and it is inseparable from the strict control of the accuracy of the process after special processing. Only these three aspects can be achieved, in order to ensure the quality of post-press processing, the perfect book cover is presented to the reader.

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