PCB Tech - How to keep PCB film

As the precision requirements of circuit boards are getting higher and higher, and the density is getting higher and higher, the dimensional stability of PCB film is particularly important. If the PCB film negatives are slightly deformed, they may cause dislocations and gaps during production. Next, let the editor take you to understand PCB film and storage methods!

1. Reasons affecting PCB film deformation

Ambient temperature and relative humidity are the two main factors that affect film size changes. Most of the changes in film size deviation are determined by ambient temperature and relative humidity. The deviation of the total deviation affected by the ambient temperature and relative humidity is proportional to the size of the film. The larger the size, the greater the deviation.

2. How to keep PCB film

1. By controlling the ambient temperature and relative humidity, it can control the deformation of the film. Ensuring the stability of the ambient temperature and relative humidity ensures the stability of the film size to a large extent. For example, thick film (0.175mm~0.25mm) is less sensitive to environmental changes than thin film (0.1mm);

2. In addition, the preservation and transportation of the film have a great influence on the size of the film negatives;

3. The unopened original film negatives should be stored and transported under the conditions of 50% relative humidity and 20 degrees Celsius.

4. Before using the film, open the airtight seal, remove the inner packaging, and keep it in contact with the ambient temperature for a period of time.

5. After the film is drawn and punched, it should be wrapped in special film paper and placed in a dry special-sized plastic bag for storage and transportation as soon as possible. It is absolutely forbidden to put the film directly in a hot and humid environment, and it is not allowed to perform destructive operations such as bending, folding and stretching the film.

In summary, we can know that the storage of PCB film can only ensure the dimensional stability of the film if there is a good environment during transportation, production, storage and use, and the changes in temperature and humidity are reduced. How is it, did you learn some little knowledge? Continue to pay attention to the editor, I will take you to travel in the ocean of PCB knowledge!
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