How to distinguish the film and mask made by screen printing with naked eyes

1. Appearance inspection: visually inspect the film marks, appearance, process quality and graphics, and check whether the film is smooth, free from wrinkles, cracks and scratches, clean and free from dust and fingerprints.

2. Optical density test: measure the transparent and opaque parts with ordinary optical densitometer, or compare them with visual comparison method.

3. Detail and detail size inspection: When checking details, use a special optical instrument with linear magnification of 65,438+00 times or more, which has measuring scale and can read, and check whether there are wire defects (such as pinholes and edge gaps) and whether there are dirty spots between wires.