Abstract: Peel off device (4) for unwinding a web of material (2) from a stock roll (1), especially for high speed unwinding a web of a thin polymer film or the like, comprising a base (5) associated to the roll (1), a linear guiding device (6) mounted on the base (5), an idler support (7) linearly guided on the base (5) in a direction towards the roll (1), and a pair of idlers (9, 10) for the web (2) to be unwound. The idlers (9, 10) are mounted offset with respect to each other on the idler support (7) to provide for a meandering path of the web between the idlers (9, 10). The axes of rotation (A9, A10) of the idlers (9, 10) are parallel to the bearing axis (A3) of the roll (1). The first idler (9) is pushed towards the roll to maintain a contact force (F) between the first idler (9) and the surface of the roll (1) while the web (2) is peeled off the roll (1).