Due to the density of the screen, the brand of the photosensitive adhesive, the light source, etc., the exposure time will be inconsistent, which requires time to accumulate experience.
Here, we recommend a test method:
1. Prepare a stencil coated with photosensitive adhesive, and also prepare a negative film (it is best to have large patterns and thin lines on it), and stick the left end of the negative film to the stencil with transparent tape (to avoid between the negative film and the screen) Of the location)
2. Use a piece of red paper (red or black waxed paper, or red film--characterized by its thinness and good shading effect) between the negative and the screen to cover the right three-quarters of the pattern, and the left One quarter is exposed, after five minutes of exposure in the usual way, turn off the power
3. Move the red paper to the right by a quarter, that is, half of the negative film is covered and half is exposed. After exposure for 5 minutes in the usual way, turn off the power; and so on. Exposure four times, then The four parts on the screen from left to right are exposed for 20 minutes, 15 minutes, 10 minutes, and 5 minutes, respectively.
4. Use the usual method to clean the screen, and observe carefully, which part of the effect is good, which time is used.
note:
1. You can also choose to move the red paper from right to left
2. You can also choose 1 second, 180 seconds, 300 seconds per exposure ...
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