sentences:  Steel yankees are instead always metallised since the beginning.The big dimension generates a problem with the elimination of the condensate forming inside the cylinders, therefore all yankees use a system with blow through steam which than it is re-compressed by help of a thermocompressor (ejector).In the inner surface of the yankee circular grooves are present which accommodate small pipes (s.c. "straw pipes" or "straws") through which the mixture of steam and condensate is sucked by means of a pressure difference between the yankee and the tank collecting the condensate (separator).