PCB film common faults and solutions

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PCB Manufacturers: Common Dry Film Faults and Solutions

In the PCB process, using dry film technology can lead to several common faults. Below are some common issues encountered with PCB films and their solutions:

1. Dry Film Not Firmly Attached to Copper Foil

- Cause: The surface of the copper foil is not clean, possibly due to oil or oxidation.
- Solution: Clean the surface again and wear gloves to prevent contamination.

- Cause: The dry film solvent has deteriorated due to volatilization.
- Solution: Store dry film at low temperatures and avoid using expired materials.

- Cause: Fast transmission speed and low PCB film temperature.
- Solution: Adjust the PCB coating speed and temperature.

- Cause: Ambient humidity is too low.
- Solution: Maintain the relative humidity of the production environment at 50%.

2. Bubbles Between Dry Film and Copper Foil Surface

- Cause: The copper foil surface is uneven, with pits and scratches.
- Solution: Increase the pressure during the PCB film application and handle the plates gently when placing them.

- Cause: The surface of the hot press roll is uneven, with pits or damage from drilling.
- Solution: Ensure the hot press roll surface is well-maintained and protected.

- Cause: The temperature of the PCB film is too high.
- Solution: Reduce the PCB film temperature.

PCB film common faults and solutions

3. Dry Film Wrinkles

- Cause: The dry film is too sticky, which can cause mishandling.
- Solution: Handle the board carefully throughout the process.

- Cause: The board is too hot prior to applying the film.
- Solution: Ensure that the preheating temperature is not excessively high.

4. Leftover Adhesive

- Cause: The dry film quality is poor.
- Solution: Replace the dry film with a higher-quality option.

- Cause: Exposure time is too long.
- Solution: Shorten the exposure time.

- Cause: Developer malfunction.
- Solution: Replace the developer.

By addressing these common issues with appropriate solutions, PCB manufacturers can ensure a more efficient and effective production process.

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