source:News release time:2023-06-14 Hits: Popular:PCB Assembly company
1. The dry membrane is not sticked on the copper foil firmly
(1) The surface of the copper foil is not clean, and there are oil or oxidation layers. Re -clean the board and wear glove operation.
(2) The solvent volatilizes in dry membrane solvents and spoils. Storage should be low temperature and do not use expired dry membranes.
(3) Fast transmission speed and low PCB film temperature. Change the PCB film speed and PCB film temperature.
(4) The environmental humidity is too low. Maintain a 50 % relative humidity of the production environment.
2. Bubbles appear between the dry membrane and the surface of the copper foil
(1) The surface of the copper foil is uneven, with concave pits and scratches. Increase the pressure of PCB film, and the plate transmission should be brought lightly.
(2) The surface of the thermal pressure roller is uneven, and there are concave pits and rubber membrane drilling. Pay attention to protecting the flat surface of the thermal roller.
(3) PCB film temperature is too high to reduce the temperature of the PCB film.
3. Dry film wrinkle
(1) The dry membrane is too sticky, and put it carefully.
(2) The front of the front of the PCB film is too hot, and the preheating temperature of the board should not be too high.
4. Residue
(1) Poor capsule quality and replace the dry membrane.
(2) The exposure time is too long, shortening the exposure time.
(3) The shadow solution is invalid, and the shadow solution is changed.
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