Abstract: A device intended for creating a reinforcing strip formed by flattening a tube (t) comprising a first means for dispensing a tape (b) comprising an interleaf (D on one of its faces, at a given linear speed, and a second means comprising two rolls intended to flatten the said tube (t), in which device the said first and second means are able to be set in rotation relative to one another about an axis of rotation (XX?) parallel to the direction (p) in which the tape (b) progresses through the device, so that when the device is operating, the tape (b) is wound in a spiral on itself in contiguous turns to form a tube (t) the axis of which corresponds substantially to the axis (XX?) of rotation of the first means with respect to the second means, characterized in that it comprises a means (3) of calibrating the diameter of the tube (t) and positioned between the first and second means, and in that the said calibration means (3) rests against the exterior surface of the said tube (t), and a separation means (27) po