Abstract: A wrapping machine has a transfer and accumulation device including an accumulator element on which a part of the sleeve is wound, and a mechanism for performing spreading of the open end of the sleeve after transfer to the covering station. According to the invention, a programmable control device determines the position and/or the inclination angle of the feed axis of the load by synchronizing the positioning control of the transfer device with position data of the load. This results in positioning of the transfer device according to the spatial position of the load to be packaged.

Abstract: A wrapping machine has a transfer and accumulation device including an accumulator element on which a part of the sleeve is wound, and a mechanism for performing spreading of the open end of the sleeve after transfer to the covering station. According to the invention, a programmable control device determines the position and/or the inclination angle of the feed axis of the load by synchronizing the positioning control of the transfer device with position data of the load. This results in positioning of the transfer device according to the spatial position of the load to be packaged.

Abstract: A packaging machine comprises a preparation station for preparing a sleeve from a stretchable plastic film wound flat around a storage reel, and a gripper device for taking hold of the sleeve and transferring it to the depositing station for enveloping the load. According to the invention, the gripper device comprises at least one set of grippers which is equipped with notched bars to create differential stretch with the formulation of a lunula. Each bar is given a translational and/or rotational movement so that the bar can be extracted and the sleeve disengaged at the end of the depositing cycle.

Abstract: A packaging machine comprises a preparation station for preparing a sleeve from a stretchable plastic film wound flat around a storage reel, and a gripper device for taking hold of the sleeve and transferring it to the depositing station for enveloping the load. According to the invention, the gripper device comprises at least one set of grippers which is equipped with notched bars to create differential stretch with the formulation of a lunula. Each bar is given a translational and/or rotational movement so that the bar can be extracted and the sleeve disengaged at the end of the depositing cycle.

Abstract: A machine for winding film, a method of manufacturing spools of pre-stretched film, and spools of pre-stretched film obtained as a result, are disclosed. The method of winding spools of pre-stretched stretchable film includes importing oscillation to the film with a component perpendicular to the axis of the film. For example, during pre-stretched and winding of the film on a take-up spool, a feed spool, i.e. a spool from which the stretchable film for stretching is taken, is caused to oscillate, and/or the take-up core is caused to oscillate. This ensures that successive layers of film are offset, in particular at the margins of the film. Spools of film obtained in this way do not have portions of extra thickness and lower tension at the margins as is the case prior art spools of pre-stretched film.