What causes plastisol to build-up on the back of screens and how can I eliminate it?
When printing wet-on-wet, the dry screen will pick up wet ink from the garment. If the ink remains wet on the back of the screen the amount of ink pick up is minimal. As a matter of fact, after several prints you will find that the colors appear slightly more opaque since the amount of lift off is nil (printing wet ink against wet ink). Build-up results when the ink on the back of the screen dries out. The dry layer of ink will, again, as with the dry screen, pick up ink from the garment. As the second layer of ink dries, the build-up process continues. The layer of ink on the backs of the screens will widen also, creeping into the image area. Once this happens, production must be stopped to wipe the screens clean. Once production begins again, so does the build-up process. Rutland plastisols have been formulated to remain wet during the printing process and therefore eliminates any build-up on the backs of screens.
