There is provided a roller including: a roller body part; and a rubber part attached to the roller body part, the rubber part including: a rubber body part provided on an outer circumference of the roller body part; and a side extending part extending on a side face of the roller body part from a side face of the rubber body part, wherein the roller body part has a recess portion formed on the side face of the roller body part, and into which the side extending part is fitted.

An idler roll employed in a blown film extrusion line is non turning and a plurality of wear strips are removably attached to the idler roll at circumferentially spaced positions around the idler roll. The wear strips engage blown film passing over the idler roll. The wear strips have reduced coefficients of friction than that of the idler roll, have high wear resistances and the blown film passing over the wear strips cleans and polishes the surface area of the wear strips the film moves across, substantially making the wear strips and the non turning idler roll maintenance free compared with idler rollers with bearings.

In many continuously webbed machines, media is fed through the machine with rollers mounted to one or more rotating shafts. These shafts may be supported on each end with a cylindrical journal bearing. The rollers move at the same rate as the media to maintain traction with the media to control media position as it moves the media from one process to another through the sequence of processes in the webbed machine.