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1. Loss of photosensitive film during development cannot form a plate
(1) Underexposure.
(2) The dose of the photosensitizer is insufficient or fails, and the sensitivity decreases.
2. The full-page image produces a light gray fog (1) The workplace where the photosensitive liquid is applied and dried is too bright.
(2) Insufficient exposure time and insufficient development.
(3) Excessive heating when coating and drying part of the photosensitive liquid.
(4) The exposure time is too long.
3. Subtle parts of the image are not developed
(1) The exposure time is too long.
(2) The front and back of the positive film are reversed, and the positive film and the facial mask of the photosensitive film do not fit well.
(3) Insufficient pre-processing of the wire mesh.
(4) The photosensitive film is too thick and the type of photosensitive adhesive is not selected properly or the photosensitive adhesive is invalid.
4. There are a lot of bubbles in the screen after coating
(1) Insufficient degreasing treatment of the wire mesh.
(2) Clean the screen before applying the photosensitive adhesive.
(3) In the coating process, the temperature difference between screen drying and photosensitive adhesive is large.
(4) The storage temperature of the photoresist is too high.
(5) The photoresist and coating layer are too thin.
(6) Uneven coating speed. [next]
5. Too many pinholes
(1) Dust is the main cause (2) Progression is caused by blistering of the photosensitive liquid itself.
(3) When using a coating squeegee, if the coating squeegee moves too fast, it will easily blister and generate pinholes.
(4) Adding too much photosensitizer will also produce pinholes.
(5) The coated surface is easy to get dust, so the workplace must be kept clean, such as the printing glass surface, the positive film surface, and the photosensitive liquid coating surface must be kept completely clean.
(6) A small amount of octanol can be added to the photosensitive liquid as an antifoaming agent.
6. Obvious porosity after screen printing plate development
(1) Whether the high temperature drying has been carried out after the shadow.
(2) Whether a photosensitizer with a long shelf life is used.
(4) Whether there is dust falling into the photosensitive adhesive.
(5) Whether the photosensitizer and the emulsion are mixed thoroughly, and whether they are used after the bubbles disappear.
(6) Grasp the exposure time.
7. Graphic resolution is not high after printing
(1) Whether the development is sufficient, and whether to use clean water to wash under pressure after development.
(2) Whether the silk screen used for the second time has been cleaned before use.
(3) Whether the screen is dry in a horizontal position.
(4) Whether to use photosensitive resin with high resolution.
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