source:Industry News release time:2022-05-27 Article author:yu Popular:pcb
01Bubble appears between the dry film and the copper foil surface
Bad problem: Choosing a flat copper foil is the key to ensuring no bubbles.
Solution: increase the pressure of the electroacoustic PCB film, and handle the board with care.
Bad problems: The surface of the hot pressing roller is uneven, with pits and film smudges.
Solution: Regularly check and protect the flatness of the surface of the heat press roller.
Bad problem: The temperature of the electroacoustic PCB film is too high, causing some contact materials to wrinkle due to the temperature difference.
Solution: reduce the temperature of the electroacoustic PCB film.
02 The dry film is not firmly attached to the copper foil
Bad problem: The surface of copper foil is not properly cleaned, and direct operation will leave oil stains or oxide layers.
Solution: Wash the plate with gloves.
Bad problem: dry film solvent quality is not up to standard or has expired.
Solution: Manufacturers should choose high-quality dry film and regularly check the shelf life of dry film.
Bad problem: fast transmission speed, low temperature of electroacoustic PCB film.
Solution: Change the electroacoustic PCB film speed and the electroacoustic PCB film temperature.
Bad problem: The humidity of the processing environment is too high, resulting in prolonged dry film bonding time.
Solution: Keep the relative humidity of the production environment at 50%.
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