How do I know if my plastisol ink is cured?
There are multiple destructive and non-destructive test methods for evaluating plastisol cure. These should be used to validate durability at existing settings. Two economical tools for defining dryer performance are the donut probe and the heat gun. Neither is an absolute indicator of complete fusion, and the two have completely different purposes.
The gun should be aimed into the heating chamber and the exit temperature should be recorded. It should read typically between 275 and 325 degrees F for plastisol. The donut should be calibrated and passed through to look for peaks or low spots in the dryer. The peak temperature should be singular and close to the exit point. Once the ink has reached fusion temperature, plastisol does not improve by sustaining the time and doing so may have unwanted side effects, e.g. sublimation.