GENERAL INFORMATION
IR dryers use very high temperatures and a fixed amount of electricity. One of the drawbacks of using a very hot heat source is that heat wants to travel from a very high temperature to a very low temperature. In other words, the heat generated from an IR dryer will travel to the press wall and attempt to increase its temperature because it is cooler than the heat produced by the IR dryer. Because the thermistors used in the Tempest® dryer use lower temperatures, the heated air has had time to cool by the time it reaches the wall of the press, reducing the chance of premature wear to press parts.
HOW DRYING IS ACCOMPLISHED WITH TEMPEST®
KEY FACTORS TO REMEMBER ABOUT DRYERS FOR SMALL OFFSET PRESSES.
Tempest® "sets" the surface of the ink to prevent
Tempest® accelerates the final drying of oil based inks by raising the temperature of the delivery stack.
Do not expect a dryer to "instantly" dry the ink. Only UV inks and coating dry instantly. The technology and hazards of such systems make them cost prohibitive on small offset presses.
Some jobs may require spray powder. Because dryers for small offset presses do not dry ink instantly, powder will be required from time to time. However, you should expect to see a significant decrease in the amount of powder needed on a regular basis.
Dryingtimeisdependentuponpressspeed,paperstock,inkcoverage, type of ink, etc.
Do not expect a dryer to accelerate the drying of rubber based inks. These inks dry by absorption into the stock, and heat does not accelerate this process.
5
