(Quoted from ScreenWeb.com. Full article here.)
With the injection of performance fabrics and garments being developed for many niche markets, the demand for innovative ways to decorate them has drastically increased. Enter dye sublimation printing.
The beautiful thing about this process is the lack of any "print feel" to the garment. Because it takes a white fiber and dyes it through heat and pressure, there's no residual ink on the surface to create a texture or to block airflow. Many sport teams have moved toward sublimated apparel for training gear and uniforms because the garment retains all of the dry-wicking properties that an undecorated garment would, plus it's a lot more colorful.
This process is almost always done on a polyester garment because it's the best fabric for absorbing the dye into the fibers. There are some garments that have a cotton base with a polyester coating or poly fibers woven into the cotton to give printers additional options, but the optimal surface to sublimate is one that will completely accept the process of dyeing from the ink as it turns into a gas.
Assuming you're comfortable with the basics of the process, and you have a clear idea of what types of garments you can do, it's beneficial to consider a few quick tips to make your prints as good as they can be: learning the color progression of sublimation, adjusting your design comps to fit the products, using the nature of sublimation in your designs, and understanding outsourcing vs printing in-house.
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