Pre-printing error printing remediation program (below)

The identification methods of film on the production site generally include: manual scraping film identification method and naked eye observation and identification method. The artificial scraping film to identify the film surface of the film is to use a blade to scrape the film on the film except for the finished printed product. If the scraped film is damaged, a light transmission phenomenon occurs at the scratch, indicating that the surface is the film surface. The method of visual observation and identification is that the film surface of the film is relatively dark, while the film surface (base surface) is relatively bright, with a clear mirror effect. If the film is identified by the same reticulated version, when the film is observed visually by the film, the film has a dark feeling, and the density of the dot is relatively large. When the film is face-down inspection, the film is felt. Films are bright and glossy, and dot density is also small.
Film spot size identification method

If the sun-dried version of the screen, the film surface of the film is not in direct contact with the surface of the printing plate, and the dots of the dried fabric will appear smaller phenomenon, affecting the reproduction quality of the product. Therefore, the printing and printing staff must learn to identify the commonly used dots with the naked eye. In this way, if the film surface of the film is incorrectly used during printing, the printing plate dot becomes significantly smaller, and by checking the printing plate or printing sample sheet, it is possible to find the error of the printing plate.

In general, 1 to 10% of the dots are commonly used, and they are also easily visually recognizable. The identification of the number of points within 50% of the points within the network is based on the number of particles that can accommodate the same point in the space between the two sides of the edge. That is, within the gap between the two outlets on the opposite side, three equal-sized outlets can be placed, which is a 10% outlet; if within a distance between two outlets, two equally large outlets can be accommodated, which is called 2 In the distance between two outlets, it can accommodate 1.5 equally large outlets, called 30% outlets; if two outlets can accommodate 1.25 same-sized outlets, it is called 40%. Network points; if the two outlets can accommodate one and the same size of outlets, that is to say, the printing outlets and white spots in each unit area account for half of the total, that is, 50% outlets. And 50% of the Internet sites are judged by the number of white spots that can hold the same size between the two white spots.

From the point of view of the regularity of the number of dots, the number of dots contained within the spacing of two white dots is exactly the same as that of 40%; 70% is the same as 30%; 80% is the same as 20%; 90% is the same as 10% . 10% is the field version. If the layout is a field version, there will be no oblique light transmission due to no dot gap. Therefore, the field version of the film film upwards will not affect the density of the field layout. .

Therefore, correctly understanding the characteristics of the film and the factors affecting the quality of the printing plate reproduction, and carefully relating the film output, printing process, and quality inspection control technology, can not only reduce or avoid the occurrence of prepress process quality problems, but also better. Guarantee the printing quality of the product.