Common Failures Caused by Printed Circuit Boards

1. Poor Bonding:

   • Ensuring proper surface treatment of printed boards is crucial for achieving strong bonding.
   • Various treatment methods are necessary depending on the material characteristics.

2. Inaccurate Image Printing Position:

   • Issues such as inconsistent material shape and excessive shrinkage can result in printing inaccuracies.
   • Changes in temperature and humidity can particularly impact printing accuracy, especially with flexible materials like plastic film.

3. Precision Graphics Printing:

   • Stringent requirements for screen frame structure, screen stretching, material properties, screen printing machine, and environmental conditions are essential for precise graphics printing.

General Faults and Remedies for Manual Screen Printing

• Before printing, it is important to understand the properties of the printed board material.
• Thoroughly inspect the screen to ensure it is clean and free from any printing material residue.
• After printing, clean the screen plate with solvent to prevent blockages in the holes.
• Avoid using resin tape for screen attachment to prevent screen shrinkage and errors in graphic size.
• If tape must be used, position it away from the graphics to prevent printing imperfections.
• Regularly check for foreign particles in the printing material and remove them before printing.
• Properly clean and rotate the squeegee to extend its lifespan and maintain good print quality.
• If the scraper is worn or chipped during screen printing, inspect and grind it to ensure optimal performance.