Factors Influencing Screen Printing Quality

• Material Properties:

  Viscosity, fineness, and fluidity of printing materials are crucial factors affecting screen printing quality.

• Screen Conditions:

  Mesh type, tension, and photosensitive adhesive used on the screen impact the final print result.

• Printing Parameters:

  Pressure, blade hardness, angle, and speed during the printing process significantly influence the outcome.

• Printing Environment:

  Temperature, humidity, and cleanliness of the printing environment are essential for consistent and high-quality prints.

Viscosity and Printability in Screen Printing

The viscosity of printing materials, like synthetic resins and pigments, is affected by temperature variations. Maintaining a stable temperature and humidity in the screen printing area, along with standardized screen plate and PCB screen printing conditions, is key to achieving consistent print quality.

Fluidity Considerations in Screen Printing

The particle size and agglomeration of printing materials determine the mesh selection for optimal fluidity. It is recommended that the mesh opening be 3 to 5 times the average particle size for efficient printing results.

Material Fluidity and Its Impact on Printing

Prior to using stored printing materials, thorough stirring is necessary to prevent pigment particle agglomeration. Thixotropic fluids, which exhibit decreased viscosity with increased shear rate, require time to recover after stirring. The proper consideration of factors like thixotropic index (TI), print pressure, wire resolution, and leveling performance is crucial for achieving desired print outcomes.