The film film of the film is attached to the printing surface (convex surface) of the screen, and then exposed in a vacuum exposure machine. The exposure time depends on the thickness of the photoresist and the energy of the exposure lamp and the requirements of the screen (the general line, solder resist, characters, and screen time required for the screen). Generally, the exposure ruler is used to determine the exposure time. Exposure time, and then fix the exposure time of the screen.
Note: If the exposure time is too short, the photosensitive adhesive will be easy to fall off, the line will become thicker, the solder resist is not strong, and the character number is not strong. If the exposure time is long, it will cause quality accidents such as incomplete development or thinning of the line. Therefore, it is especially recommended that the accurate exposure time comes from the scientific practice. Before the exposure in production, the exposure time must be fixed with the exposure ruler, and then the exposure time should be fixed. Do not do things by experience and work blindly.
