The special phenomenon of overprinting on the J2108 machine
2019-02-02 11:04:45
Imprinting is generally divided into two cases: one is the error of the upper and lower rules; the second is about the rules and regulations. Both situations may occur at the same time, or they may occur independently, which will directly affect the quality of printed products. Under normal circumstances, it is easier to find the reasons for over- or under-printing. Sometimes the situation is much more complicated. We have encountered one case.
When we printed a batch of colorful works, yellow and red were overprinted accurately. When printing blue, there was a problem. The rules are well set up, but the picture and text are quite different. Most of the pictures and texts are registered. The individual pictures are far apart. Is it a bad film? Or is the paper retractable? We have carefully checked and compared the printed papers and found that the paper is indeed very powerful, but it will not be such a big influence on the rules and regulations and individual images. Will it be a matter of stress? If the pressure is uneven, it may also lead to contraction or expansion of individual images. We opened the blanket cylinder and found no abnormalities after inspection. The lining was also satisfactory. What are the reasons? We began to examine the mechanical reasons. During the inspection, we found that there was a loose paper in the teeth and we adjusted our teeth. It was because of this that the reason for overprinting was not allowed.
Our preliminary analysis is this: the left and right overprints are not clearly caused by the paper's rise. Because the teeth are loose and the two heads are inconsistent, causing the paper to tilt, and forming a trend, when the paper is passed to When embossing the teeth, it is still in a tilted state, plus the paper has a certain degree of tenacity and tension. At the same time of hydrophilic, through different pressures and the pressure of the roller, the paper is arbitrarily raised, thus forming a paper stretching and mechanical The synchronous complications of the failure have created difficulties for underprinting. After adjusting the machine and printing plate, we minimized the error in the vast majority of images and texts, and finally remedied the printing products.
When we printed a batch of colorful works, yellow and red were overprinted accurately. When printing blue, there was a problem. The rules are well set up, but the picture and text are quite different. Most of the pictures and texts are registered. The individual pictures are far apart. Is it a bad film? Or is the paper retractable? We have carefully checked and compared the printed papers and found that the paper is indeed very powerful, but it will not be such a big influence on the rules and regulations and individual images. Will it be a matter of stress? If the pressure is uneven, it may also lead to contraction or expansion of individual images. We opened the blanket cylinder and found no abnormalities after inspection. The lining was also satisfactory. What are the reasons? We began to examine the mechanical reasons. During the inspection, we found that there was a loose paper in the teeth and we adjusted our teeth. It was because of this that the reason for overprinting was not allowed.
Our preliminary analysis is this: the left and right overprints are not clearly caused by the paper's rise. Because the teeth are loose and the two heads are inconsistent, causing the paper to tilt, and forming a trend, when the paper is passed to When embossing the teeth, it is still in a tilted state, plus the paper has a certain degree of tenacity and tension. At the same time of hydrophilic, through different pressures and the pressure of the roller, the paper is arbitrarily raised, thus forming a paper stretching and mechanical The synchronous complications of the failure have created difficulties for underprinting. After adjusting the machine and printing plate, we minimized the error in the vast majority of images and texts, and finally remedied the printing products.
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