The basic process for producing heat-applied plastisol transfers is uncomplicated. You print a design with plastisol ink, but instead of printing it directly on the garment, you print the design on special paper. The paper is then passed through a dryer where the ink is heated until it has gelled just enough to be dry to the touch. It's important not to cure the ink too much.
The resulting print, called a transfer, can be stored until needed. When you want to apply the transfer to a T-shirt, place the garment in a heat transfer press, put the transfer on top of the garment, ink side down, and close the press. The heat and pressure applied by the press will force the ink into the garment and finish curing it. When the press is opened and the paper is peeled off the shirt, the ink remains behind. When done correctly, a heat-applied plastisol transfer will be as permanent as a direct print and under some circumstances nearly indistinguishable.
