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        # Solving Dye Migration and Screen Clogging in Textile Plastisol Screen Printing Inks

        

**Topic:** Coatings

        

Screen printing bright white graphics onto dark 100% polyester athletic sportswear is a demanding technical operation. Formulators must stop dispersed fabric dyes from turning white ink pink, while preventing ink from drying and choking fine mesh screens during long print shifts.

        
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## Problem

White ink prints on red or navy polyester garments appear clean right off the conveyor dryer, but turn pinkish-purple 24 to 72 hours later. On the shop floor, ink thickens and dries in fine 60T to 90T screen meshes during hot summer runs, forcing frequent washouts.

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## Likely cause

Disperse dyes used in synthetic polyester fibers sublime into gas at temperatures above 130°C. Standard plasticizers absorb these gaseous dye molecules and allow them to migrate through the cured ink layer to the outer surface. Premature screen choking occurs when low-grade plasticizers with high volatile loss evaporate on the warm screen platen.

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## Corrective direction

Formulate dedicated 'Low-Bleed White' plastisols using virgin Paste PVC Resin with non-phthalate plasticizers like DOTP or ATBC that feature low volatility and poor affinity for disperse dyes. Incorporate active dye-blocking barrier particles (such as activated carbon micro-fillers or specialty barrier resins) into the underbase formulation. Set flash cure units to 105°C to 115°C for 4 to 6 seconds to set the ink film without triggering polyester sublimation, followed by a controlled tunnel oven cure strictly at 155°C to 160°C.

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          ## Frequently Asked Questions

          
### Why do white prints turn pink days after drying rather than inside the oven?

Disperse dyes continue migrating slowly at room temperature as long as the plasticizer in the ink film has open pathways to dissolve and carry the dye to the surface.

### Can adding thinners or mineral spirits fix thick ink on the screen?

No. Solvents evaporate quickly, ruin plastisol shelf life, and weaken the ink film's wash fastness. Use low-viscosity plasticizer reducers like DOTP instead.

        
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By NBT Technical Desk · Updated 2026-09-06

        

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