Sublimation is actually a printing method that uses dyes with a molecular weight of less than 300 in disperse dyes. These dyes are easily sublimed because of their small molecular weight. The sublimation temperature is between 180 and 200 degrees Celsius. At this temperature, polyester approaches its softening point. Large gaps make it easy for gaseous dye molecules to enter the gap between molecules and become part of the fiber. This is the theory of dye-sublimation printing.
The procedure is to first print the dye on special paper and then transfer the pattern to the polyester cloth by hot pressing at about 200 degrees Celsius.
Disperse dyes/sublimation printing can only be applied to polyester and some nylon cloths. Cannot be applied to cellulose fiber fabrics.
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