Apparatus and a process for dividing heat-shrinkable plastic film into different temperature regions within a shrink wrap oven including a movable platform; a cylindrical tube immovably mounted within the oven in the direction of movement of the platform and including a platform for supporting a portion of the heat-shrinkable plastic film and a slit running the length of said cylindrical tube; a package covered with heat shrinkable plastic film and including that portion of the heat-shrinkable plastic film resting on the platform adjacent the cylindrical tube; an electric fan mounted at the opposite end of the cylindrical tube containing the platform and sucking ambient air through the cylindrical tube to cool that portion of the heat-shrinkable plastic film as the heat-shrinkable plastic film is tightly shrunk around the package.