Banana roller devide NBR roller and EPDM roller.it has a certain arc in the longitudinal direction, it is fixed by the ball bearing and rotatable.When the film is rotated through the roller, it will be stretched in the longitudinal direction because of the certain curvature of the curbed rubber roller. The roller can stretch the film to eliminate wrinkles and prevent the material in the cutting process.In other words, curved shaft fixed and the bending rubber roller would rotate well.It is widely used for the paper, film, textiles and similar machine and equipment.