In the screen printing industry, the performance of peelable protection inks depends not only on peel stability across complex substrates but also on the structural integrity of the ink film. Due to the high viscosity and heavy film build characteristic of screen printing, air entrapment is a constant threat. If micro-bubbles are not eliminated, they become stress-concentration points, leading to film tearing or adhesive residue during removal.

By combining RK-Chem’s specialized release additives with targeted defoaming technology, formulators can achieve a balance between high-efficiency protection and effortless removal.

1. Industry Pain Points in Screen Printing Peelable Inks

• "The Air Trap" in Thick Layers: Screen printing forces ink through mesh under high shear, easily trapping air. In high-viscosity peelable systems, these bubbles cannot escape, resulting in pinholes that compromise both protection and tensile strength during peeling.

• Adhesion Build-up vs. Clean Removal: The deep contact between resin and substrate often causes adhesion to increase over time. For precision parts, any residue or "ghosting" after peeling is unacceptable.

• Thermal Degradation in Heat-Peel Processes: In automotive or electronic workflows, inks are often peeled immediately after baking. High temperatures can cause standard additives to migrate too quickly or fail, making the film brittle and causing it to "shatter" into small pieces.

2. RK-Chem Release Solutions: Precision Interface Control

The RT-3143 series creates a "flexible isolation barrier" at the interface, ensuring continuous and smooth peeling even for thick screen-printed layers.

• RT-3143 (Cold-Peel Specialist): The Room-Temperature Lubricant

• Core Function: Specifically regulates the initial peel force between the ink and substrates like PET, metal, or glass. It eliminates the "stuttering" feel during removal.

• Advantage: It assists in leveling out mesh marks, providing a smooth surface that prevents extra suction caused by surface roughness.

• RT-3143A (Heat-Peel Enhanced): The High-Temperature Shield

• Core Function: Features exceptional thermal stability. It maintains a stable molecular isolation layer at the interface during 80°C–150°C baking cycles.

• Advantage: It prevents "thermal sintering" where the resin bonds permanently to the substrate due to heat, ensuring the film remains elastic and peels in one piece.

3. Synergistic Defoaming: Ensuring a Dense, Flawless Film

To eliminate bubbles during production and printing, a dual-stage defoaming strategy is essential:

• RP-6086 Silicone Defoamer: The Macro-Bubble Breaker

• Features: Extremely low surface tension. It rapidly breaks large bubbles generated during high-speed mixing and the mechanical action of the squeegee.

• Application: Added during the grinding stage to ensure the ink is air-free before packaging, preventing mesh clogging during printing.

• RP-3098 Non-Silicone Defoamer: The Micro-Bubble Terminator

• Features: Provides excellent de-aeration with superior system compatibility.

• Application: Ideal for high-precision systems where pinholes and fish-eyes must be zero. It eliminates deep-seated micro-bubbles to ensure a dense film. As a non-silicone agent, it avoids inter-layer adhesion issues if multiple coats are required.

4. Formulation Design Guidelines

For solvent-based screen printing peelable inks, we recommend the following additive loading:

• Peel Control: Add 0.8% - 2.5% of RT-3143 (Cold-Peel) or RT-3143A (Heat-Peel).

• Defoaming Combination:

• RP-6086: Add 0.1% - 0.3% during the grinding phase for initial foam control.

• RP-3098: Add 0.2% - 0.5% during the let-down stage to eliminate micro-bubbles and ensure a level surface.

• Technical Tip: Given the high viscosity of screen inks, ensure a minimum of 15–30 minutes of high-shear mixing after adding additives to ensure uniform distribution.

5. Conclusion

In the development of peelable screen printing inks, peel force control and film quality are inseparable. By utilizing the RT-3143 series to solve interface bonding and pairing it with the RP-6086 and RP-3098 dual-defoming strategy, your products can achieve the performance standards of top international brands.

Visit rk-chem.com for 2026 Technical Data Sheets or to request a sample kit.

Tags: #ScreenPrinting #RT3143 #RT3143A #RP6086 #RP3098 #PeelableInk #Additives #RKChem