To solve the problems in printing, we must first have a clear understanding of it. What does this problem look like and how is it different from other problems? Secondly, we should also understand what causes it, and between these causes What does it matter.
The problems described below all have one thing in common: problems that can be observed with the naked eye or with the aid of a microscope.
In general, problems are divided into two categories: errors at the edges of graphics and text and errors at the area of ​​graphics. The error of the edge of the picture and text means that the edge of the picture and text does not match the original, and the error of the picture and text area refers to the problem of the surface of the picture and text. (Note: The problems that occur in screen printing are not limited to these two types. Registering and aligning graphics, adjusting ink volume and post-press processing have an impact on printing quality.)
There are generally four characteristics that can be used to identify, compare, and classify graphic problems, as follows:
position
Refers to the position of the problem in the continuous printed matter relative to the entire graphic. If the location display is "same" (the same), then the problem always appears in the same place. Other possible situations are "various position" (different position) or outside the printing area, or close to (inaccurate) the same position.
direction
Refers to the position of the problem relative to the printing variable. For example, when the angle between the image and the mesh line is 1 ° to 10 ° or 80 ° to 89 °, the jagged edge phenomenon is most obvious. The direction also refers to the direction of the blade scratches, blade length, and image edges.
size
Refers to the size of the image in question relative to the qualified print. For example, smudging will make the image larger, while missing edges will make the image smaller. When the image changes irregularly in the printed product, you can fill in "random" in the form.
frequency
The frequency of problems on fingerprints. Some problems always exist, such as ghosting; some problems appear occasionally, such as ink lines; and some problems appear continuously on several prints and then disappear, then you can fill in the table with "Both".
These four characteristics explain why it is better to solve faults during printing than afterwards. Unfortunately, if the printer does not understand the difference between defects, it is difficult to confirm the problem and solve it.
In addition to the above four features, each fault has one or more features that are easy to identify.
in conclusion
1. The problem of image clarity can be divided into two parts: image edge defects and image area defects.
2. Image edge defect refers to the edge is not accurately and faithfully copied; image area defect refers to the appearance of the printed product or ink coverage.
3. In order to describe the problem clearly, you must first know the recognized standards: location, orientation, size, and frequency.
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