Precautions in the process of image atlas printing
With the acceleration of the pace of modern urban construction, in order to visually reflect urban development and reflect the overall urban planning, more and more provinces and cities apply spatial information resources and high-resolution satellite imagery data, and publish corresponding image atlases. In order to ensure high-quality restoration of image landforms, image atlas must be printed with high quality. In this article, the author summarizes the precautions in the process of image atlas printing and share it with you.
Requirements for the printing environment
Due to the printing of the image atlas, the characters and lines of the three-color or two-color overprinting are more. If the temperature and humidity of the workshop are not well controlled, the paper is prone to "corner" and deformation, which causes the overprinting to be inaccurate, and thus cannot be printed normally. Therefore, the temperature of the workshop should be controlled at 20 to 24 ° C, and the humidity should be controlled at 60% to 70%.
Requirements for raw and auxiliary materials
1. Ink
Use imported inks, such as Japanese butterfly ink or matt coated paper special ink.
2. Paper
Due to the strong ink color of the image atlas, the color saturation is required to be bright. Generally, the imported coated paper of 128g/m2 or 157g/m2 is used, the texture is uniform, the dot reproduction ability is strong, and the ink absorption is good.
3. Plate material
Generally adopting the CTP version, the transmission of the dots is accurate, which is beneficial to maximally reproduce the color and level of the image atlas.
4. Blanket
Imported blankets are used. This is because the imported blankets have better indexes in terms of elasticity and density, and can transfer images more completely, and the dot reproduction ability is strong.
Requirements for craftsmen
When the image atlas is printed, there is usually a professional image atlas technician to follow the machine, strictly control the consistency of the color, check the content for errors, and accurately mark the printed products. When printing an image atlas, it is recommended that the same person sign with the machine, because different people have different perceptions of color, and multi-person signatures will affect the consistency of the color of the entire image collection. However, there is also a deficiency in the same person's signing with the machine, that is, a person is prone to fatigue, especially when the equipment is not stopped for a long time, which will adversely affect the physical and mental health of the person. This should be noted.
Precautions in the production process
1. Cleaning Equipment
Since the paper is highly static and easy to absorb dust, it is necessary to pay attention to cleaning the paper roller dust, which is an essential part.
2. Use the same type of equipment
Try to use the same type of equipment, otherwise the diameter of the drum of different equipment is not the same, which will cause the color difference is too large, the overprinting is not allowed, etc., especially when there are spot colors in the four colors, it is more likely to cause overprinting.
3. Printing speed is stable
It is required that the speed of the printing equipment is stable, it is not suitable to accelerate or decelerate frequently, and the printing speed should not be too fast.
4. Cut the paper according to the printing speed
According to the printing speed, the paper can be cut according to the printing speed. For example, if a team can print 5 sets of plates, the paper amount of the 5 sets can be cut, so as to prevent the paper from being exposed to the air for a long time due to untimely printing.
5. "Turning over" while printing
After printing the front side of the 5-6 sets, print the reverse side immediately to avoid deformation due to excessive paper stacking time.
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