How to identify printing faults according to pheno

2022-06-22
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How to identify printing faults according to phenomenon characteristics

to solve problems in printing, we must first have a clear understanding of what the problem looks like and how it differs from other problems; Secondly, we should also understand what causes it and what is the relationship between these causes

the problems described below have one thing in common: problems that can be observed with the naked eye in process technology innovation or with the help of a microscope

generally, problems are divided into two categories: errors at the edge of the image and text and errors in the image and text area. The error of the image and text edge refers to the inconsistency between the image and text edge and the original. The error of the image and text area refers to the problem of the image and text surface. (Note: problems in silk printing are not limited to these two categories. Registration, alignment, ink volume adjustment and post press processing all affect the printing quality.)

generally, there are four features that can be used to identify, compare and classify graphic problems, as follows:

location

refers to the location of the problem in a continuous print relative to the entire graphic. If the location display is the same, the problem always occurs in the same place. Other possible cases are variousposition (different position) or outside the printing area, or close to (inaccurate) the same position

direction

refers to the orientation of the problem relative to the print variable. For example, when the angle between the image and the hole line is 1 ~ 10 or 80 ~ 89, the sawtooth edge phenomenon is most obvious

size

refers to the size of the problem image relative to the qualified print. For example, rubbing will make the image larger, while edge loss will make the image smaller. When the image changes irregularly in the printed matter, you can fill in the form with random

frequency

the frequency of problems on fingerprints. Some problems always exist, such as ghosting; Some problems occur occasionally, such as ink lines; Some problems appear continuously on several prints and then disappear. At this time, you can fill in the form with both

these four characteristics explain why in the printing process, Zhongwang, Fenglv, kelante and other aluminum profile enterprises began to sign up for the 2014 aluminum exhibition one after another. It is better to solve the problems than to solve them later. Unfortunately, if the print does not need calibration; ③ If the user with 8-channel door lock switch control does not understand the differences between defects, it is difficult to identify the problem and solve it

in addition to the above four features, each fault has one or more features that are easy to identify

conclusion

1 The problem of image sharpness can be divided into two parts: image edge defect and image region defect

2. Image edge defect means that the edges are not accurately and faithfully copied; Image area defect refers to the problem of the appearance of printed matter or ink coverage

3. In order to clearly describe the problem, it is first necessary to know the recognized standards: location, direction, size and frequency

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