Cooled mandrel for winding a strip product

A winding mandrel according to any of the previous claims, comprising a number (n) of segments (2) and wherein the central shaft (1) extends between a rear portion connected to means for driving said shaft into rotation round its axis, and a front portion for supporting the segments (2), characterised in that the radial sliding of the segments is controlled by a rack-type device comprising a tubular sheath (3) mounted to slide axially on the front portion of the central shaft and whereon are arranged at least (n) faces (31) tilted with respect to the axis, co-operating each with a mating tilted face (21) of a corresponding segment (2), for controlling, respectively, the expansion or the retraction of the mandrel by sliding the sheath (3) between two positions, respectively a retracted position and an extended position, under the action of a control rod (4) mounted slidingly parallel to the axis (X′X) of the central shaft (1) and prolonged beyond a front end (12) thereof in order to be attached to a linking member (40) with the tubular sheath (3), extending transversally before the front end (12) of the central shaft (1).

A winding mandrel according to any of the previous claims, characterised in that each segment (2) comprises an internal portion (20′) supporting means controlling the radial sliding and an external portion (20) in the form of a cylindrical sector, of welded construction and comprising two curved plates, respectively internal and external, spaced apart from one another in order to provide a free space divided, by at least one wall parallel to the axis, into at least two chambers, respectively supply and exhaust chambers, wherein emerge, respectively, an inlet orifice and an outlet orifice of heat exchanging fluid, arranged in the internal plate of the segment, at an end thereof, said chambers being communicated at the other end of the segment.