Wrapping system for a packaging machine of the "sleeve" type able to wrap hot sheets of heat-shrink packaging material around objects ( 10a, 10b, 10c, etc.) to be packaged, wherein said system comprises: - first objects conveying means, wich are able to move objects ( 10a, 10b, 10c, etc.) longitudinally in a spaced succession; - second objects conveying means, which are arranged downstream and at a short longitudinal distance with respect to said first objects conveyor means in order to form a first opening between said first and said second object conveyor means, wherein said second objects conveyor means are able to receive the objects ( 10a, 10b, 10c, etc.) coming from said first objects conveyor means, and wherein said second objects conveyor means are able to move the same objects ( 10a, 10b, 10c, etc.) along a wrapping surface which has an inlet end and an outlet end; - third objects conveyor means, which are arranged downstream and at a short longitudinal distance from said second object conveyor means in order to form a second opening between said second and said third object conveyor means, wherein said third objects conveyor means are able to receive the objects ( 10a, 10b, 10c, etc.) arriving from said second objects conveyor means; - sheets feeder conveyor means, which are positioned in the vicinity of said first opening and which are able to supply individual sheets (Sb) of heat-shrink material; - sheet wrapping means, which are positioned in the vicinity of said second objects conveying means and which comprise at least one suspended wrapping bar, which is oriented transversely with respect to the direction of advancement of the objects ( 10a, 10b, 10c, etc.) and which is brought to move along an orbital path that passes through said first and said second opening, wherein said suspended wrapping bar transports the sheets ( Sa, Sb, Sc) of packaging material; - control means, which are able to control, operate and synchronize the various operative means; characterized by the fact that said sheet wrapping means comprise separator means ( 502/512/602), which are able to prevent and/or limit the contact between the front portion and the rear portion of the sheet (Sb) when said bar transports said sheet ( Sb) for the execution of the wrapping operations of the sheet ( Sb) around the product. - first objects conveying means, wich are able to move objects ( 10a, 10b, 10c, etc.) longitudinally in a spaced succession; - second objects conveying means, which are arranged downstream and at a short longitudinal distance with respect to said first objects conveyor means in order to form a first opening between said first and said second object conveyor means, wherein said second objects conveyor means are able to receive the objects ( 10a, 10b, 10c, etc.) coming from said first objects conveyor means, and wherein said second objects conveyor means are able to move the same objects ( 10a, 10b, 10c, etc.) along a wrapping surface which has an inlet end and an outlet end; - third objects conveyor means, which are arranged downstream and at a short longitudinal distance from said second object conveyor means in order to form a second opening between said second and said third object conveyor means, wherein said third objects conveyor means are able to receive the objects ( 10a, 10b, 10c, etc.) arriving from said second objects conveyor means; - sheets feeder conveyor means, which are positioned in the vicinity of said first opening and which are able to supply individual sheets (Sb) of heat-shrink material; - sheet wrapping means, which are positioned in the vicinity of said second objects conveying means and which comprise at least one suspended wrapping bar, which is oriented transversely with respect to the direction of advancement of the objects ( 10a, 10b, 10c, etc.) and which is brought to move along an orbital path that passes through said first and said second opening, wherein said suspended wrapping bar transports the sheets ( Sa, Sb, Sc) of packaging material; - control means, which are able to control, operate and synchronize the various operative means;