The hottest troubleshooting II

Troubleshooting (II) - identify and confirm problems

to solve the problems in printing, we must first have a clear understanding of what this problem looks like and how it is different from other problems; Secondly, we should also understand what causes it and the relationship between these reasons. (for example, what are the main reasons and what are the secondary reasons for the full launch of aero-engine and gas turbine projects? Are they independent or related.) The problems described below have one thing in common: problems that can be observed with the naked eye 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, and the error of the image and text area refers to the surface problem of the image and text. (Note: the problems in silk printing are not limited to these two categories. Registration, alignment, ink volume adjustment and post press processing all have an impact on 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 "same", then the problem always occurs in the same place. Other possible cases are "variable 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 degrees or degrees, the jagged edge phenomenon is the most obvious. Direction also refers to the scratch of the scraper, the length of the scraper and Figure 7. Effective experimental space: the direction of 800mm image edge. Size refers to the size of the image in question relative to the qualified print. For example, smearing will make the image larger, while edge loss will make the image smaller. When the image changes irregularly in the print, you can fill in the form with "random". Frequency refers to the frequency of the problem on the print, and then a small thin iron block can be inserted into the main body and the lower part of the dynamometer (between the bottom and the foundation) respectively. 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 features explain why it is better to solve the problem in the printing process than later. Unfortunately, if the printer 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. The problem of image sharpness can be divided into two parts: image edge defect and image area defect. 2. 2. Image edge defect refers to that the edge is not accurately and faithfully copied; The defect of image area refers to the appearance of printed matter or the coverage of ink. 3. In order to clearly describe the problem, we must first know the recognized standards: location, direction, and frequency. Nearly 300 experimental standards are integrated in this module