(Quoted from Kent Hudson, Contributing Write of Impressions Magazine. Full article here.)

The dryer performs a very important job in a screen-printing shop. If it's not working properly it can result in the ink that cracks, or falls off after a garment is washed. 

Achieving the required temperature to completely fuse plastisol ink should not be a guessing game. Just like any other high-performance piece of equipment, the more you understand how it operates, the easier it is to use.