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Overprinting is not the most common problem in newspaper printing. Newspapers are often encountered by readers. Special complaints from some advertisers have a great impact on the reputation and economic benefits of newspapers.
1. Types of inaccurate overprint
Inaccurate overprinting includes three types: circumferential overprinting and axial overprinting, that is, circumferential expansion, axial expansion, and axial skew. Because the paper absorbs water and expands during the printing process, overprinting may occur in the circumferential and axial directions of the cylinder due to expansion, that is, the color printing plate expands to the four sides first, and then the printing color appears to shrink inward. Overprinting is not allowed to be more obvious on the four sides of the paper in the axial and circumferential directions. Generally, as long as the rear color printing rubber liner is adjusted to make it slightly thicker than the front color printing liner, it can basically be solved. The axial skew is mainly caused by the following reasons: First, there is a deviation in the punching of the PS (CTP) version, which causes a certain color version of the same set of four-color version to be skewed after bending, which makes the overprint inaccurate; another One situation is that after long-term use, there is mechanical wear on the shaft end of the plate cylinder and the gear, which causes the plate cylinder and the rubber cylinder to be not completely parallel when they are in contact, which is caused by skew caused by mechanical reasons.
2. Cost analysis
This kind of vinyl paper used as a traditional plate-making is available for sale in printing materials stores. A roll requires us about 20 yuan, but a roll can be used at least a few hundred times. The cost of each roll is only a few cents. The cost of supplementing a folio CTP version is about 40 yuan, not to mention that sometimes one set or several sets need to be replaced at the same time, the cost advantage is self-evident; at the same time, if the overprint is not allowed to be complained by the advertiser , Often means that the advertising costs from tens of thousands to tens of thousands of yuan can not be recovered, and from the perspective of time, the version change and version need to be stopped and waited, if the version change cannot meet the requirements once again, the version will be changed again The delay in time is very obvious, and we feel that this is a very effective method after a period of use, and it is proposed to be shared with industry peers.
3. Solutions
Some newspapers are equipped with a light-controlled scanning cross-line automatic bending machine when purchasing a printing machine, which minimizes the error during bending. At the same time, they purchase a commercial rotary machine equipped with a diagonal pull version.å‘› ⑼ åµ is hooped by the edge of the hoop ?? / P>
However, a considerable number of newspapers still use manual punching and bending at the same time. At the same time, the printing press is not equipped with a slanting plate version mechanism. And cost is a lot of waste. After research, we adopted the following method to effectively solve this problem: cut a piece of 10cm × 10cm waste version, use black plastic paper to paste it into 3 layers, 4 layers, 5 layers and other different thicknesses. Different degrees of axial skew of the one-color version, remove the version (note that the version cannot be broken), select different layers of black adhesive paper and cut it with a utility knife to a width of about 1cm, then fold it in half, with the glued water facing the printing plate According to the position and degree of skew, it is necessary to stick on the operation side or the transmission side. For thicker skew (4 layers and 5 layers), the position of the adhesive tape can also be moved to the middle seam direction; For spline wear, according to usual experience, the color plate should normally be the same at the same position every day, so that the appropriate number of layers of adhesive paper can be attached to the color plate crease during the plate installation. After the color plate is reinstalled on the machine, the position of the corresponding end can be raised, and the skew is corrected, reducing the time and number of shutdown processing, ensuring the timeliness, and the quality is also guaranteed.
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