Abstract: A method of wrapping bundles is with stretch film from a reel. Bundles include products in transit through a wrapping machine including a wrapping unit having a ring winder which rotatably arranges stretch film around the bundles. During transit through the winding unit, the stretch film is unwound from the reel and passes through a pre-stretching group which generates axial deformation of the film predetermining an elastic return quantity. The axially deformed film interfaces with a vacuum having a vacuum box producing a constant auxiliary tensional stress on the pre-stretched film equal to the head inside the vacuum box. The film is then deposited on the bundles with a constant stress residue at each point of application of the pre-stretched film after adding the constant load generated by the vacuum box, producing bundles completely wrapped with a programmed stress residue.

Abstract: A machine wrapping bundles with stretch film from a reel with continuous suction includes a ring wrapping machine arranging stretch film around the bundles. The film unwinds from a reel on a rotating ring of the wrapping machine to wrap around bundles, during the passing of the bundles. A pre-stretching group of the stretch film generates an axial deformation of the stretch film. A vacuum box downstream of the pre-stretching group continuously receives the deformed film. The pre-stretching group and vacuum box are arranged on the rotating ring around the bundles. A rotating magnetic track associated with the rotating ring causes a magnetic track wheel/disc to rotate, creating a magnetic transmission having a shaft supported in the pre-stretching group, which actuates a rubber roller on which the film passes. A dynamo connects directly to the magnetic transmission and batteries. A vacuum pump connects to the vacuum box and batteries.

Abstract: A machine wrapping bundles with stretch film from a reel with continuous suction includes a ring wrapping machine arranging stretch film around the bundles. The film unwinds from a reel on a rotating ring of the wrapping machine to wrap around bundles, during the passing of the bundles. A pre-stretching group of the stretch film generates an axial deformation of the stretch film. A vacuum box downstream of the pre-stretching group continuously receives the deformed film. The pre-stretching group and vacuum box are arranged on the rotating ring around the bundles. A rotating magnetic track associated with the rotating ring causes a magnetic track wheel/disc to rotate, creating a magnetic transmission having a shaft supported in the pre-stretching group, which actuates a rubber roller on which the film passes. A dynamo connects directly to the magnetic transmission and batteries. A vacuum pump connects to the vacuum box and batteries.

Abstract: A machine is for packaging products, such as bottles and other containers, in bundles. An apparatus for packaging products in bundles includes a conveying system for the products, crossing in the following order: a separation station for separating the products into a sequence of groups, a wrapping station for wrapping the groups in sequence in a continuous tube of pretensioned extensible plastic film, a cutting station for cutting the continuous tube of pretensioned extensible plastic film to form bundles of the products wrapped in the pretensioned extensible plastic film. The separation station includes a spacing member for spacing products to form groups and a stabilization member for stabilizing spacing between the groups including a first gripper device and a second gripper device. The gripper devices are configured to move and insert spacers into the space formed by the spacing member between two groups of products.

Abstract: A method of wrapping bundles is with stretch film from a reel. Bundles include products in transit through a wrapping machine including a wrapping unit having a ring winder which rotatably arranges stretch film around the bundles. During transit through the winding unit, the stretch film is unwound from the reel and passes through a pre-stretching group which generates axial deformation of the film predetermining an elastic return quantity. The axially deformed film interfaces with a vacuum having a vacuum box producing a constant auxiliary tensional stress on the pre-stretched film equal to the head inside the vacuum box. The film is then deposited on the bundles with a constant stress residue at each point of application of the pre-stretched film after adding the constant load generated by the vacuum box, producing bundles completely wrapped with a programmed stress residue.

Abstract: A cutting unit separating bundles wrapped with a continuous wrap or cutting a flat film in dynamic transit includes a load-bearing structure supporting eccentric wheels hinged on opposite sides of the load-bearing structure and including an outer crown element idly coupled to an eccentric central plate. A heated cutting wire is fixed onto the outer crown element by pins, at a first circumferential portion of the eccentric wheels. A tensioning wire has an elastic compensation element and is fixed to the outer crown element by pins, at a second circumferential portion of the eccentric wheels, so an arc between pins of the first and second circumferential portions is less than 180°. The eccentric central plate is eccentrically fixed to a respective shaft, fixed to a pulley. The pulleys continuously and synchronously rotate to impart alternate motion perpendicular to a continuous wrap or flat film, between engagement and disengagement positions.

Abstract: A honeycomb sandwich sheet or panel, based on thermoplastic polypropylene, includes a structure having two flat outer films, at the top and bottom, welded to at least two inner or central thermoformed blister films, repeated in a regular and continuous pattern, wherein the at least two inner thermoformed films are welded to each other.

Abstract: A honeycomb sandwich sheet or panel, based on thermoplastic polypropylene, includes a structure having two flat outer films, at the top and bottom, welded to at least two inner or central thermoformed blister films, repeated in a regular and continuous pattern, wherein the at least two inner thermoformed films are welded to each other.

Abstract: The present invention relates to a honeycomb sandwich sheet or panel, based on thermoplastic polypropylene, comprising a structure consisting of two flat outer films, at the top and bottom (10, 12), welded to an inner or central film (11) blister thermoformed (13), with blisters repeated in a regular and continuous pattern, wherein said inner or central film (11) is thermoformed on both sides or faces.

Abstract: A motorization group of reels in a machine for winding plastic film onto bobbins, wherein at least two spindles are positioned on a rotating plate around a central shaft constrained to a frame of the machine, a motor being operatively coupled to each of the spindles, in the motorization group each of the motors being constrained to the frame and connected to each of the spindles by a belt transmission which comprises a central deflector unit aligned with a central shaft outside the frame, toothed belts connecting the central deflector unit, on the one hand, to the spindles, and on the other hand, to the motors.

Abstract: An automatic core-charging and bobbin-discharging group in a plastic film winding machine, positioned partially juxtaposed and partially below a winding reel includes a core charging portion having a motorized linear actuator carrying a guide-support which houses a certain number of cores suitable for receiving plastic film, the guide-support being movable, backwards and forwards, between a position associated with a core charger and a juxtaposed position, axially parallel to a spindle of the winding reel, with the cores inserted on the spindle, the linear actuator also being vertically liftable with a variation in an external diameter of the cores, and a bobbin discharging portion having a motorized conveyor belt, equipped with an extendable portion, movable between a position below a spindle carrying the wound bobbins and a discharging portion of the bobbins, the conveyor belt being vertically liftable with a variation in an external diameter of the bobbins.

Abstract: An accompanying squeezing unit in a machine for winding plastic film onto bobbins, in which at least two spindles are positioned on a rotating plate around a central shaft constrained to an upright of the machine, the group including an accompanying squeezing roll situated on a lever mechanism which is selectively actuated to rotate-oscillate by actuators in order to maintain the squeezing roll positioned on a film in the final winding onto a bobbin positioned on one of the spindles, the lever mechanism being activated when the plate carrying the spindles is rotated to discharge a finished bobbin. The lever mechanism in the group includes two first levers and two second levers articulated relative to each other.

Abstract: A honeycomb sandwich sheet or panel, based on thermoplastic polypropylene, includes a structure having two flat outer films, at the top and bottom, welded to at least two inner or central thermoformed blister films, repeated in a regular and continuous pattern, wherein the at least two inner thermoformed films are welded to each other.

Abstract: The present invention relates to a honeycomb sandwich sheet or panel, based on thermoplastic polypropylene, comprising a structure consisting of two flat outer films, at the top and bottom (10, 12), welded to an inner or central film (11) blister thermoformed (13), with blisters repeated in a regular and continuous pattern, wherein said inner or central film (11) is thermoformed on both sides or faces.

Abstract: An automatic positioning group in a machine for winding plastic film onto bobbins that determines the correct position of an operative oscillating element with respect to a core such as a bobbin of a film having a different diameter sizes, wherein the operative oscillating element is supported at first free ends of levers hinged on pins associated with a frame of the winding machine and oscillated by a related actuator. The levers extend, in an opposite position to the ends carrying the operative oscillating element into appendices which collaborate with at least one pair of abutments positioned on a respective cam rotated with respect to the frame by an actuator, wherein each of the abutments is positioned on the cam with a different radial dimension with respect to a rotation axis of the rotating cam. The operative oscillating element can consist of a contact roll or a cutting blade.

Abstract: A holding and supporting group of a winding spindle in a machine for winding plastic film onto spools includes a winding reel positioned between two uprights, wherein a first upright carries a rotating plate which cantilever-supports three spindles and a central shaft, wherein the central shaft is supported at the other end by the second upright, wherein, in correspondence with a free end of the central shaft, there is a star-shaped plate with three supporting arms for each free end of the three spindles through a respective toggle lever mechanism driven by an actuator carried on a lever articulated with respect to the star-shaped plate, and in turn caused to oscillate between an operative blocking position of the respective spindle and a rest position for releasing the respective spindle by an additional actuator.

Abstract: An accompanying squeezing unit in a machine for winding plastic film onto bobbins, in which at least two spindles are positioned on a rotating plate around a central shaft constrained to an upright of the machine, the group including an accompanying squeezing roll situated on a lever mechanism which is selectively actuated to rotate-oscillate by actuators in order to maintain the squeezing roll positioned on a film in the final winding onto a bobbin positioned on one of the spindles, the lever mechanism being activated when the plate carrying the spindles is rotated to discharge a finished bobbin. The lever mechanism in the group includes two first levers and two second levers articulated relative to each other.

Abstract: A motorization group of reels in a machine for winding plastic film onto bobbins, wherein at least two spindles are positioned on a rotating plate around a central shaft constrained to a frame of the machine, a motor being operatively coupled to each of the spindles, in the motorization group each of the motors being constrained to the frame and connected to each of the spindles by a belt transmission which comprises a central deflector unit aligned with a central shaft outside the frame, toothed belts connecting the central deflector unit, on the one hand, to the spindles, and on the other hand, to the motors.

Abstract: A holding and supporting group of a winding spindle in a machine for winding plastic film onto spools includes, a winding reel positioned between two uprights, wherein a first upright carries a rotating plate which cantilever-supports three spindles and a central shaft, wherein the central shaft is supported at the other end by the second upright, wherein, in correspondence with a free end of the central shaft, there is a star-shaped plate with three supporting arms for each free end of the three spindles through a respective toggle lever mechanism driven by an actuator carried on a lever articulated with respect to the star-shaped plate, and in turn caused to oscillate between an operative blocking position of the respective spindle and a rest position for releasing the respective spindle by an additional actuator.

Abstract: An automatic core-charging and bobbin-discharging group in a plastic film winding machine, positioned partially juxtaposed and partially below a winding reel includes a core charging portion having a motorized linear actuator carrying a guide-support which houses a number of cores suitable for receiving plastic film, the guide-support being movable, backwards and forwards, between a position associated with a core charger and a juxtaposed position, axially parallel to a spindle of the winding reel, with the cores inserted on the spindle, the linear actuator also being vertically liftable with a variation in an external diameter of the cores, and a bobbin discharging portion having a motorized conveyor belt, equipped with an extendable portion, movable between a position below a spindle carrying the wound bobbins and a discharging portion of the bobbins, the conveyor belt being vertically liftable with a variation in an external diameter of the bobbins.