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How much is the exposure tolerance for PCB auto dry film?

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#81115

How much is the exposure tolerance for PCB auto dry film? | 28 September, 2018

How much is the exposure tolerance for PCB auto dry film?

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#81117

How much is the exposure tolerance for PCB auto dry film? | 28 September, 2018

Principle A layer of photosensitive material (photosensitive oil or dry film) is applied to the copper foil on the board surface, and PCB manufacturer should be use the position is exposed by black film, This applies to most PCB factories, especially PCB proofing factories, such as ALLPCB, 4PCB.etc. And the line pattern is formed after development. Second, chemical cleaning Equipment: chemical cleaning machine Function: a. Remove oxides, garbage, etc. on the surface of Cu; b. roughen the surface of Cu to enhance the bonding between the surface of Cu and the photographic oil or dry film. Method for detecting the effect of washing plate: a. Water film test, requirement Factors affecting the washing board: degreasing speed, degreaser concentration, micro-etching temperature, total acidity, Cu2 concentration, pressure, speed Defects that are easy to produce: open circuit (poor cleaning results in film), short circuit (cleaning does not produce garbage)

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#81121

How much is the exposure tolerance for PCB auto dry film? | 29 September, 2018

for pattern position with +/-2mil tolerance, pattern width may minus 0.5mil max with the traditional auto exposure.etching tolerance determined by the base copper foil.

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