Types of Photosensitive Emulsions for Screen Printing
1. Types of Photosensitive Emulsions
Photosensitive emulsions are used to coat the mesh fabric, forming a light-blocking layer to create the pattern.
1.1 Diazo Emulsion
Low cost with good water resistance, suitable for general inks (such as water-based and solvent-based inks).
Longer exposure time with moderate resolution.
1.2 SBQ Emulsion (Single-Component Photopolymer)
High resolution with short exposure time, ideal for fine details (such as circuit boards and high-definition halftones).
More expensive and requires high-mesh screens.
1.3 Capillary Film
Pre-coated film that directly adheres to the mesh, eliminating the coating process.
Suitable for high-precision applications.
2. Material Selection Recommendations
2.1 General Printing
Polyester mesh + aluminum alloy frame + Diazo emulsion.
2.2 High-Precision Printing
Stainless steel mesh/high-mesh polyester + SBQ emulsion.
2.3 Curved/Flexible Surface Printing
Nylon mesh + low-viscosity ink.
Selecting the appropriate materials can significantly enhance screen durability and print quality. The choice should be based on ink type, substrate material, and pattern complexity.