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 wrapping method comprises the prior stretching of a film. The prior Stretching of the film advantageously includes a step of paying out the film from a feed reel, a stretching step, and a step of winding the stretched film onto a mandrel or a take-up reel in readiness for subsequent use. The film of the present invention is previously stretched under a large amount of tension, is released, and is then wound under moderate tension, under which the film is allowed to relax. The present invention is applicable to preparing film for wrapping loads that are optionally palletized and suitable for being put into place either manually, or mechanically.

Abstract: A wrapping method comprises the prior stretching of a film wherein the prior stretching of the film advantageously includes a step of paying out the film from a feed reel, a stretching step, and a step of winding the stretched film onto a mandrel or a take-up reel in readiness for subsequent use. The film of the present invention is previously stretched under a large amount of tension, is released, and is then wound under moderate tension, under which the film is allowed to relax. The present invention is applicable to preparing film for wrapping loads that are optionally palletized and suitable for being put into place either manually, or mechanically.

Abstract: A wrapping method comprises the prior stretching of a film wherein the prior stretching of the film advantageously includes a step of paying out the film from a feed reel, a stretching step, and a step of winding the stretched film onto a mandrel or a take-up reel in readiness for subsequent use. The film of the present invention is previously-stretched under a large amount of tension, is released, and is then wound under moderate tension, under which the film is allowed to relax. The present invention is applicable to preparing film for wrapping loads that are optionally palletized and suitable for being put into place either manually, or mechanically.

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.

Abstract: The present invention relates to a pre-stretched film, and to apparatus and a method of applying outer packaging to packages and to loads, optimized as a function of the structure and in particular the shape of the package or the load, in particular a palletized load, and also as a function of the transport and handling that the package or the load must be capable of withstanding without the outer packaging being dislocated. According to the invention, a stretchable film is stretched over at least one roller having a diameter that varies along its axis of rotation so as to form parallel longitudinal zones in the film that have different degrees of stretching. These zones make it possible, in particular, to track the external outlines of objects to be packaged and/or to provide locally-reinforced bonding, or on the contrary to present surfaces that are more relaxed. The present invention applies in particular to packaging and grouping together loads that may optionally be palletized.

Abstract: The present invention relates to a pre-stretched film, and to apparatus and a method of applying outer packaging to packages and to loads, optimized as a function of the structure and in particular the shape of the package or the load, in particular a palletized load, and also as a function of the transport and handling that the package or the load must be capable of withstanding without the outer packaging being dislocated. According to the invention, a stretchable film is stretched over at least one roller having a diameter that varies along its axis of rotation so as to form parallel longitudinal zones in the film that have different degrees of stretching. These zones make it possible, in particular, to track the external outlines of objects to be packaged and/or to provide locally-reinforced bonding, or on the contrary to present surfaces that are more relaxed. The present invention applies in particular to packaging and grouping together loads that may optionally be palletized.

Abstract: The present invention relates to a pre-stretched film, and to apparatus and a method of applying outer packaging to packages and to loads, optimized as a function of the structure and in particular the shape of the package or the load, in particular a palletized load, and also as a function of the transport and handling that the package or the load must be capable of withstanding without the outer packaging being dislocated. According to the invention, a stretchable film is stretched over at least one roller having a diameter that varies along its axis of rotation so as to form parallel longitudinal zones in the film that have different degrees of stretching. These zones make it possible, in particular, to track the external outlines of objects to be packaged and/or to provide locally-reinforced bonding, or on the contrary to present surfaces that are more relaxed. The present invention applies in particular to packaging and grouping together loads that may optionally be palletized.

Abstract: This device is designed such that the differential tangential speeds V are variable at different points of a deformable flat film (1) or plate that moves along at least one drawing roller (3) rotating about an axis XX, said film (1) or plate moving in a direction perpendicular to the axis of rotation of the roller and resting on a generatrix G.sub.N of the roller. The roller (3) has a rotational speed N which is constant with time, while the distance G.sub.N C.sub.1 from the supporting generatrix G.sub.N of the film to the axis C.sub.1 of rotation of the roller is variable with time. The invention is applicable to the drawing of plastic films.

Abstract: The invention relates to a drawing device. This device is designed such that the differential tangential speeds V are variable at different points of a deformable flat film (1) or plate that moves along at least one drawing roller (3) rotating about an axis XX, said film (1) or plate moving in a direction perpendicular to the axis of rotation of the roller and resting on a generatrix G.sub.N of the roller. The roller (3) has a rotational speed N which is constant with time, while the distance G.sub.N C.sub.1 from the supporting generatrix G.sub.N of the film to the axis C.sub.1 of rotation of the roller is variable with time. The invention is applicable to the drawing of plastic films.

Abstract: A machine for packing a load in a section of sheath made of supple material, and particularly of plastic material, comprises mechanisms for supplying flat sections of sheath in the direction of the load and for opening the downstream end of each section of sheath opposite the load, and a pleating device for progressively pleating part of each section of sheath. The pleating device has rotatable pleating members applied against the sheath and against support ramps located inside the sheath. A movable covering frame whose section is larger than the cross section of the load to be packed is provided for bearing the section of pleated sheath. The rotatable pleating members are mounted on a support independent of the covering frame and the pleating device comprises mobile pleating arms.

Abstract: A device for shaping a film of heat-retractable plastics material in the zone of the lateral spaces of a pallet-less multi-layer load having a layer of reduced width, said spaces for gripping purposes being defined by right-angled dihedrons, comprises mobile shaping elements intended to be applied against the film of plastics material which is still soft covering the faces of each dihedron defining a space for gripping.Each shaping element is constituted by a bar and means are provided to displace each shaper bar in the direction of the edge of the dihedron, to engage said bar in the angle of the dihedron between the layer of reduced width and the normal layer of the load located beneath this reduced layer.Each shaper bar is fast with one or more elements accelerating cooling of the plastics material.

Abstract: A packing for a pallet-less multi-layer load with a layer of reduced width defining lateral spaces for gripping purposes, each of these spaces, which are parallel to each other, having the form of a right-angled dihedron, comprises a plastic film element for protection and reinforcement applied on the reduced layer and the spaces for gripping. The protecting and reinforcing element is provided, in its parts adapted to be applied respectively on the faces of the dihedrons forming the spaces for gripping, with at least one additional band or strip folded inwardly and forming an extra thickness on the two faces of each of these dihedrons. The protecting and reinforcing element of plastics film is advantageously constituted by a section of sheath with gussets, the gussets being disposed either perpendicularly or parallel to the spaces for gripping.