Factors Affecting the Quality of PCB Ink:

• Viscosity:

  Viscosity, also known as dynamic viscosity, measures the fluidity of PCB ink under external forces. It is crucial for the ink’s performance.

• Plasticity:

  Plasticity refers to the ink’s ability to maintain its properties after deformation, enhancing printing accuracy.

• Thixotropic Behavior:

  PCB ink exhibits gel-like properties at rest but changes viscosity when agitated, known as thixotropy.

• Fluidity:

  Fluidity describes how the ink spreads under external forces and is influenced by viscosity, plasticity, and thixotropy.

• Viscoelasticity:

  Viscoelasticity refers to the ink’s ability to quickly rebound after shearing, crucial for optimal printing results.

• Dryness:

  PCB ink should dry slowly on the screen for accurate printing but quickly on the substrate.

• Fineness:

  Fineness indicates the size of pigment particles in the ink, affecting smooth application and print quality.

• Wire Drawing:

  Wire drawing measures the ink’s tendency to stretch into threads without breaking, impacting printing quality.

• Transparency and Hiding Power:

  PCB inks vary in transparency and hiding power based on their application requirements.

• Chemical Resistance:

  Inks must meet strict standards for resistance to acids, alkalis, and solvents for specific applications.

• Physical Resistance:

  PCB inks should resist scratches, thermal shock, and peeling while meeting electrical performance criteria.

• Safety and Environmental Protection:

  PCB inks should be non-toxic, odorless, and environmentally friendly to ensure safety and compliance.