Winding plant for use in plastic film production lines, in particular, extendable plastic films, and winding method of plastic film rolls

A winding plant for use in plastic film production lines comprising a plurality of reels (11-14) connected to a star-like reel carrier (15) rotatable around its own axis in a clockwise and a counterclockwise direction, said reels (11-14) being arranged around said star-like reel (15) in a manner such that a first reel (12) of said plurality of reels is situated in an operative winding position of a film (20) to form a complete roll (21), said reels (11-14) each comprising a mandrel (26) supported by a tailstock associated with a star-like flange element (16) comprising a first and a second notch (23,24), wherein said flange element (16) is rotatable around its own axis in a clockwise and a counterclockwise direction in a manner independent from said star-like reel carrier (15) when said tailstocks are released from said mandrels (26), so as to bring said first notch (23) to a second unloaded reel (13) and said second notch (24) to a third reel (14) loaded with a roll (21) of film (20) wherein said first notch (23) is circular-sector shaped and has a size substantially similar to the section size of a mandrel (26) or has a size substantially similar to a complete roll;

• said winding plant also including a drawing and pressure device comprising at least one cylinder (18) arranged in contact with said first reel (12) in operative winding position, said drawing and pressure device being rotatable around a torsion axis (28) and being controlled under pressure through cylinders (27).