Ad screen printing ink rookie water UV ink is optimistic (2)

Process requirements

1. The ink must be fully stirred before use.

2. In the printing process, if the ink layer is still not thin enough to cause dot gain, the HU349 thinning agent can be added to the first color and the second color ink.

3. Under the same printing conditions, since the UV ink is thicker than the solvent-based ink ink layer, the dot on the negative film can be adjusted before the screen is made. When the screen is made, a higher mesh number is selected. The single-sided flattened screen of screen or selected special UV ink can also meet the requirements by controlling the thickness of the photosensitive layer of the screen.

4. Screen making techniques:

1) Use a thin capillary photosensitive film or indirect five-star red photosensitive film to make a screen.

2) When photosensitive screens are used to make screens, in addition to using yellow polyester screens, the thickness of the photo-resist layer should be controlled at about 4 μm, and the surface roughness (RZ) should be less than 5 μm, so that the sharpness of the dots can be improved.

3) Highlights of quality control in screen making:

1 In order to ensure that small screen dots are not lost during the use of the screen, the screen must be roughened and degreasing before the screen is coated and pasted to make the photosensitive adhesive adhere to the screen securely and the small dots are not lost. To ensure that the shades of color are too natural.

(2) Screen printing screens of various colors, under the premise of ensuring the uniform and uniform tension, must be completely dried after coating and sticking the photo-resist film, otherwise the small outlets will be lost in advance during development or printing. The screen life is reduced; if the screen tension is not uniform, in addition to four-color overprinting, the screen may have moiré.

3 In the screen printing of four-color dot printing, if you want to copy the dot image of the color separation film to the screen printing film, the screen production needs some skills. During the exposure, the photosensitive layer on the screen owes Exposure and overexposure can not make the best screening plate, so the screen production must control the exposure time of the photosensitive layer (using the exposure ruler to measure the optimal exposure time), to ensure that the small screen dot (high-profile print Dots) can be washed through, and the screens on the screens can be attached to the screens.

4 After the exposure of the screen version of the development of quality is very important, the mesh screen version must be a combination of comprehensive development and local development, because the small screen is not easy to penetrate the screen, after full-scale printing, if the small network is also No rushed out, at this time should be a small network of local "water column" type fill-in, so that the small outlets penetrated, to ensure that the printed high-profile outlets are not lost.

After the 5th version of the graphic is developed, it is necessary to check the color separation film and determine the correctness of the screen to perform double exposure to improve the service life of the screen.

5. The printing conditions should be tested before use. After the printing, the ink should be placed for 24 hours before testing the performance of the ink.