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Heat control is extremely important for correct foil application, which can be achieved with electric or hot oil heating systems. “There are two types of oil systems: one that is wet and the oil runs through a bored out cavity in the cylinder; the other is a dry oil system where the oil doesn’t come in direct contact with the cylinder but is contained and heated with an electric heating mechanism,” says Larry Hutchison, president of UEI Group. “Between the two systems, the first one needs more consideration as it must have a thicker internal wall to contain the oil and provide structural strength to the cylinder.” Although electric heating does not run as fast as the hot oil system, high-running speeds have been achieved by both, he says.