How to Avoid Graphic Printing in Screen Printing

In screen printing, a large area of ​​graphic printing is easy to print. How to avoid it?

There are two kinds of printing, one is caused by ink, and too much or too little ink can easily cause hair growth. The second is that the solid pattern is not sufficiently transparent and uniform during development, and as a result, the ink is not evenly distributed during printing.

For the first one, it is mainly to control the amount of ink in the frame. When ink is added, it should not be too much. The first time the amount of ink added is about 200 grams, it is appropriate. When printing for a period of time, it is necessary to add ink again. This time it is skillful. When did one add ink? Another is how much ink? When it is found that the ink between the ink blade and the scraper is less than half, ink should be added. The amount of ink added is about 100 grams. Adding ink is also tricky. If it does not stop, it should be slowly added from the edge of the frame. And to add a little ink and so on to print a few dishes and then add. If the ink is shut down, there are two methods. One is to add ink to the front of the squeegee. After the squeegee is used, the ink should be leveled with a knife that is inked. Otherwise, the ink will still be printed. The other is to use the ink squeegee and the squeegee. Reach out and add ink to the back of the ink knife.

For the second, adding the appropriate amount of thinner in the ink can be solved.

There is also a skill in printing, the printing speed must be lowered, because the faster the scraper retracts, the ink ribbon will enter the printing area, resulting in the next disc printing, generally adjusted to 55--60rpm It is advisable to add some thinner to the ink to reduce the viscosity of the ink. Adjust the light source to overcome the problem of printing on the plate after printing.
(2004-06-25)
In multiple spell prints, there are often times when the layout is inconsistent after printing, and the dots are reduced to different colors, and even irregular and unshaped flowers appear. The solution is as follows:

1, in the voltage, current and exposure time under the same conditions, the main application of direct light print, if the light source adjustable printing machine, to adjust the light position of the idiocy lamp to direct light position, if it is positioning lights, it is necessary Adjust the position of the PS version.

Because the printing film also has an emulsion layer, the image portion on the film is exposed after the development by exposure to an uneven surface above the film. During the printing process, if the light is obliquely projected to the graphic part during exposure, it will affect the restoration of the graphic. Therefore, vertical light should be used for printing. The larger the format, the longer the lamp should be to keep the verticality of light as much as possible.

2, multi-splicing environmental printing lighting to use as much as possible the use of yellow light, because fluorescent tubes are currently used UV components, and the PS version of the photosensitive range is also in the blue-violet area.

3, multiple spells in the sun operation, the action should be fast and always pay attention to cover with light black paper, in order to avoid the crosshairs in the multiple operation process, due to long exposure time caused by the layout of the flower exposure exposure shadow.

4, manual development is not standardized, is not strict, even with a large row of pens to help significantly, it is easy to cause layout defects.

5. To solve other quality problems that may occur on the PS plate production line, a high-quality PS plate should be used.

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