Two cloths, one file, two different results. The explanation is in the blend rather than in the press.
How sublimation actually works
The dye turns to gas under heat and bonds inside the polyester filament itself.
There is no ink layer on the surface, which is why the print cannot crack or peel.
Polyamide does not take the dye
It stays lighter, so a 70/30 blend renders the same file softer than an 80/20 does.
The effect is most visible in deep solids and least visible in light, airy artwork.
Which blend to pick
Choose the higher polyester content when the cloth is carrying a brand mark for display.
Choose the higher polyamide when the cloth will genuinely be used to clean every day.
Designing for the softer render
Increase contrast rather than saturation, and avoid relying on a single deep solid.
We proof on the actual blend before the run, so nobody is surprised by the first carton.