Essential Specifications for PCB Screen Printing Technology
PCB screen printing technology is governed by specific guidelines that drive its development. Let’s explore the key specifications that ensure the efficiency and accuracy of PCB screen printing:
1. Marking System
- All components, mounting holes, and positioning holes must be labeled with silk-screen markings like H1, H2, etc., aiding in the installation process.
2. Character Arrangement
- Silk-screen characters should be arranged left to right and bottom-up, maintaining a consistent direction for polarized components within each functional unit.
3. Avoidance Guidelines
- Avoid applying silkscreen on device pads, tin tracks needing tinning, and areas where devices will be placed post-installation, except for high-density PCBs exempt from silk screen printing.
4. Soldering Reliability
- Avoid silkscreen on device pads for soldering reliability and on tin channels for continuity. Maintain a 5 mil spacing between silkscreen elements to prevent functionality issues.
5. Polarity Indication
- Clearly indicate the polarity of polarized components on the silkscreen for easy identification.
6. Accuracy of Light Drawing Files
- Ensure PCB light drawing files are accurate, displaying each layer correctly and fully outputted.
7. Device Identification
- Match device identification on the PCB with symbols in the BOM to maintain consistency.
8. Directional Connector Indication
- Clearly indicate the direction of directional connectors on the silkscreen for proper assembly.
9. Barcode Marker Inclusion
- Include a barcode position marker on the PCB for easy scanning, and if space permits, add a 42*6 barcode silkscreen frame.
10. Legible Information
- Ensure that board name, date, version number, and relevant details on the finished board are clearly legible on the silkscreen and in the PCB file.
11. Manufacturer Information and Signs
- Include relevant manufacturer information and anti-static signs on the PCB to comply with industry standards and regulations.
