Heated and cooled roll

Claim 1

A HEAT APPLYING MECHANISM COMPRISING IN COMBINATION A HOLLOW ROLL HAVING AN OUTER HEATING SURFACE, AN AIR INLET LINE MEANS COMMUNICATING WITH THE INTERIOR OF THE ROLL, AN AIR OUTLET LINE COMMUNICATING WITH THE INTERIOR OF THE ROLL, A CONTROLLED LOW PRESSURE SOURCE OF AIR CONNECTED TO SAID INLET LINE CONTROLLED BY A FIRST VALVE FOR PRESSURIZING THE ROLL INTERIOR, A CONTROLLED HIGH PRESSURE SOURCE OF AIR CONNECTED TO THE INLET LINE CONTROLLED BY A SECOND VALVE FOR RAPIDLY COOLING THE ROLL AT THE END OF AN OPERATING RUN WITH THE AIR ESCAPING THROUGH SAID OUTLET LINE, A THIRD VALVE IN SAID OUTLET LINE TO BE OPENED DURING COOLING AND CLOSED FOR PRESSURIZING THE ROLL, AND A COMMON CONTROL MEANS CONNECTED TO SAID SECOND AND THIRD VALVES FOR SIMULTANEOUSLY OPENING THESE VALVES TO RELIEVE THE PRESSURE IN THE INTERIOR OF THE ROLL AND COOL IT WITH A FLOW OF AIR.