Apparatus and method for wrapping a load with a pre-stretched film

Abstract

Described is an apparatus (100) for wrapping with a pre-stretched film (200) a load (300) supported by a surface (310) comprising: a delivery head (1), provided with a delivery mechanism (2) for delivering the film (200); a drive unit, for generating a relative movement between the delivery head (1) and the load (300); a source of compressed air (3), for generating a flow of air in such a way that the flow of air blows the film (200) delivered; an electrostatic charger (4), for applying an electrostatic charge to the film (200); a deflector (5), movable between a first position, wherein the deflector orients the flow of air for blowing the film (200) delivered along a first vertical plane (P) which does not intersect the load (300), and a second position, wherein the deflector orients the flow of air for blowing the film (200) delivered along a second plane (Q), vertical and intersecting the load (300). A control unit controls the movement of the deflector (5) between the first position and the second position by means of an actuator (6).

Description

[0001] DESCRIPTION APPARATUS AND METHOD FOR WRAPPING A LOAD WITH A PRE¬

[0002] STRETCHED FILM

[0003] Technical field

[0004] This invention relates to an apparatus and a method for wrapping a load with a pre-stretched film. In the context of the apparatuses for wrapping a pre-stretched film made of plastic material around a load, there are many prior art solutions wherein the film, wound on a reel, is unrolled from the reel, delivered and wrapped around the load performing a plurality of wrapping revolutions. Usually, the reel interacts with a delivery device which, during the wrapping, picks up and delivers the film in a gradual fashion.

[0005] Background art

[0006] The wrapping operations comprise a relative rotational movement between the load to be wrapped and the delivery device. For example, there are prior art systems wherein the load is positioned on a static platform and the delivery device rotates around the load. Alternatively, there are prior art systems wherein the delivery device is static and the platform on which the load is positioned rotates. In this case, the load is positioned on a rotary platform. If the load is positioned on a static platform, solutions are known which comprise a self-propelled robot, provided with motor-driven wheels and provided with the delivery device. The robot is programmed to perform a plurality of revolutions around the load and, progressively delivering the film, wraps the load. Alternatively, the static platform may be associated with an apparatus provided with a rotary arm. The rotary arm is a device consisting of the delivery device and designed to rotate about the static platform, in such a way as to wrap the load with the film. Whatever the structure of the apparatus, it is complicated, during a first initial step of wrapping, to make the first portion of film adhere adequately and quickly. The term first film portion means the portion of film which comprises the free head end of the film, that is to say, the film portion which is firstly delivered by the delivery device, that is, which comes out of the delivery device first, and which must come into contact with the outer surface of the load. In some solutions, the first portion of film is picked up manually by an operator and positioned on the load, until it is adheres and is stabilised following the wrapping revolutions. In other solutions, the first portion of film is picked up and / or guided by pick-up elements and / or guide elements, such as, for example, grippers. The pick-up elements allow the film to interact mechanically and guide it towards the load, so that the film makes contact with the load. For example, patent documents US8099935B2, US5005335A, US4152879A, US8539739 illustrate different semi-automated or automated solutions wherein the load, positioned in a wrapping station, comes into contact with a film which is picked up and guided by the pick-up elements and / or guide elements. In the case of manual or semi-automated solutions wherein the physical presence of the operator is required, obvious drawbacks emerge due both to the safety risks for the operator present in the wrapping area and the speed and efficiency of the wrapping operations. The use of automated pick-up elements or guide elements overcomes the drawback of the presence of the operator. The mechanical pick-up elements and / or guide elements are not, however, sufficient to make the film adhere to the load in an optimum manner. In fact, the film may be dragged by the reel, due to the relative rotational movement between the delivery device, containing the reel or associated with the reel, and the load. In order to be able to attach to the load correctly, the film may also require multiple wrapping revolutions. In these cases, the quantity of film to be used is unacceptably high, which would not be used for a correct wrapping and a correct protection of the load. In order to overcome these drawbacks, the prior art teaches the automation and further optimisation of the mode of attaching the film to the load. For example, patent documents US9896229B1 and US10604284B2 describe a system for delivering the film which comprises a source of compressed air for blowing on the film in the direction of its free end, in such a way as to keep it oriented in a “flag-like” fashion. By orienting the jet of air, and therefore the film, towards the load, in combination with the reciprocal rotation between the delivery device and the load, the film is brought into contact against the outer surface of the load, facilitating the attachment. However, this solution does not completely overcome the problem, since the jet of air is useful for stretching the film and positioning it extended close to the load, but it is not sufficient to allow a fast and secure gripping. Thus, the problem remains of the large quantity of material which would be lost as a result of the many wrapping revolutions necessary to stabilise the film. For this reason, solutions such as that of patent document EP4067243A1 are also known which, in addition to the air jet, comprise charging the pre-stretched film with an electrostatic charge. In this way, the film charged electrostatically exits the delivery device, is oriented and guided close to the load and thanks to the charge is attracted electrostatically, adhering immediately to the load. However, operatively, it should be noted that this solution still does not guarantee an optimum attachment. In effect, there may be missing attachments or partial and imprecise attachments of the film during the initial wrappings. For this reason, as a whole, the process of optimising the wrapping operations cannot be considered satisfactory.

[0007] Disclosure of the Invention

[0008] The aim of this invention is to provide an apparatus and a method for wrapping a load supported on a surface with a film (preferably prestretched) and which overcome the above-mentioned drawbacks of the prior art.

[0009] In particular, the aim of this invention is to provide an apparatus and a method for wrapping a load with a film (preferably pre-stretched) which is able to guarantee a quick and effective attachment of the film to the load.

[0010] A further aim of this invention is to provide an apparatus and a method for wrapping a load with a film (preferably pre-stretched) which are reliable, secure and efficient, in such a way as to optimise the wrapping operations. Said aim is fully achieved by the apparatus and method for wrapping a load with a film (preferably pre-stretched) according to this invention, as characterised in the appended claims.

[0011] In particular, this invention provides an apparatus for wrapping a load supported by a surface with a film (preferably pre-stretched).

[0012] The load supporting surface is, for example, a pallet; alternatively, the load supporting surface may be, for example, a roller or a conveyor belt.

[0013] According to the invention, the load is wrapped by the film by a relative rotational movement between the load and a film delivery head, wherein the rotation occurs about a vertical axis. In general, according to this invention, there are both solutions wherein the load remains stationary during the wrapping and the delivery head (which is part of a self-propelled robot) rotates about the load and solutions wherein the load is positioned on a platform rotatable about a vertical axis and the delivery head remains stationary during the wrapping.

[0014] The apparatus comprises a delivery head. The delivery head is provided with a delivery mechanism. The delivery mechanism is configured for delivering the film outside the delivery head.

[0015] In an example, the delivery head comprises a plurality of rollers.

[0016] In an example embodiment, the delivery head includes a system for applying a pre-stretched film. In possible variants, the delivery head might not be provided in the pre-stretching system; in that case, for example, a reel of film is provided which is already pre-stretched. Alternatively, the apparatus might not have pre-stretching rollers (so the apparatus does not perform any action for pre-stretching and deforming the film) and delivers the film in a non-deformed state (not pre-stretched).

[0017] If the delivery head includes the system for applying the pre -stretching, the delivery head comprises, for example, at least two pre-stretching rollers. The pre-stretching rollers are configured so as to stretch and deform the film. In particular, the film is stretched due to the difference in speed of rotation between the at least two pre-stretching rollers. With respect to a delivery path, the roller of the at least two rollers which is further downstream will have a speed of rotation greater than that of the roller of the at least two rollers which is further upstream. In an example, the apparatus may have three pre-stretching rollers.

[0018] In an example, the delivery head comprises at least one control roller. The control roller is configured to be in contact with the film delivered. In particular, operatively, when the film is wrapped around a corner of the load, the control roller is pressed by the film. The control roller is configured for receiving the pressure of the film and increasing the quantity of film delivered. In this way, the apparatus reduces the tension of the film on the corner of the load.

[0019] In an example, the delivery head comprises at least one delivery roller. Preferably, the delivery head comprises two delivery rollers. The delivery rollers are counter-rotating rollers configured for automatically delivering the film. This solution makes it possible to prevent that the delivery of the film is performed manually or that the film is withdrawn outside the delivery head following the adhesion to the load and the rotation of the delivery head about the load.

[0020] The apparatus comprises a drive unit. The drive unit is configured to generate a relative motion between the delivery head and the load. The apparatus comprises a source of compressed air. The source of compressed air is configured to generate a flow of air, in such a way that the flow of air blows the film delivered. The apparatus comprises an electrostatic charger. The electrostatic charger is configured for applying an electrostatic charge to the film. The apparatus comprises a deflector. The deflector is mobile between a first position and a second position. In the first position, the deflector is configured to orient the flow of air in such a way as to blow the film delivered along a first plane. The first plane is a vertical plane. The first plane is a plane that does not intersect the load. In the second position, the deflector is configured to orient the flow of air in such a way as to blow the film delivered along a second plane. The second plane is a vertical plane. The second plane is a plane which intersects the load. The apparatus comprises an actuator. The actuator is configured for moving the deflector between the first position and the second position. The apparatus comprises a control unit. The control unit is connected to the actuator. The control unit is configured to control the actuator, in such a way that the deflector is moved between the first position and the second position. The deflector, suitably controlled by the control unit and conveniently actuated in combination with the above- mentioned features of the apparatus according to the invention, makes it possible to improve an attachment of the film to the load. The attachment of the film to the load corresponds to the first operation to be performed for a wrapping. In effect, a non-optimum or imprecise attachment would cause a non-optimum or imprecise wrapping, and / or an excessive waste of material, causing a loss of overall efficiency in the wrapping process.

[0021] The term “deflector” is used to mean, in general, any device or system which is able to vary the orientation of the air flow.

[0022] Several examples are provided in this invention regarding possible embodiments of the above-mentioned deflector.

[0023] In short, there are three different approaches for making the deflector. According to one approach, the air flow is generated with an orientation (determined, for example, by the orientation of the nozzles from which the air comes out) and the deflector includes a fin (that is, a mechanical deflector), which intercepts the air flow and is movable (for example, by rotation) relative to the delivery head, for mechanically varying the orientation of the air flow.

[0024] According to another approach, the delivery head is movable (for example by rotation) for mechanically varying the orientation of the flow of air, provided that the nozzles which dispense the flow of air are on board the delivery head. In this case, the delivery head acts as a deflector.

[0025] According to yet another approach, in which the delivery head is mounted on board a self-propelled robot (provided with a carriage fitted with motor- driven wheels), it is the robot itself which varies the orientation of the flow of air, by means of a relative suitable movement path with respect to the load, for example by rotating the entire robot (and, consequently, also the delivery head and, therefore, also the nozzles) with respect to the load. In this case, the deflector is achieved by a movement of the entire robot (or, more generally, of a relative movement of the load with respect to the structure which supports the delivery head).

[0026] The examples briefly described above will be described in more detail below.

[0027] In an example, the action of the deflector is achieved by means of the delivery head. In this example, the delivery head is movable between the first position and the second position. In the first position, the head is configured to orient the flow of air in such a way as to blow the film delivered along the first vertical plane, which does not intersect the load. In the second position, the delivery head is configured to orient the flow of air in such a way as to blow the film delivered along the second vertical plane, which intersects the load. In this example, the actuator which allows the delivery head to be moved between the first position and the second position may be a dedicated actuator or, alternatively, the drive unit may move the head between the first and the second position. In an example, the apparatus comprises an anthropomorphic robot (for example, a robot with 6 axes). In this example, the delivery head is integral with an end of the anthropomorphic robot. Thus, in this example, the robot acts as a dedicated actuator for the delivery head, and it is the movement of the robot along its axes which determines the orientation of the head (acting as deflector) between the first and the second position. In an example, the control unit is programmed to receive a start signal and to respond to the start signal. The control unit is programmed, in response to the start signal, for setting the apparatus in a first operating configuration. In the first operating configuration, the control unit is programmed to deactivate the drive unit, in such a way that the delivery head is stationary relative to the load. The control unit is programmed to control the actuator in such a way that the deflector is in the first position. The control unit is programmed to activate the delivery mechanism. The control unit is programmed to activate the electrostatic charger. The control unit is programmed to activate the source of compressed air. In this way, the delivery head delivers a flag of pre-stretched film which comprises a free head end. In the first operating configuration, the flag is oriented along the first plane, so that it does not make contact with the load. Moreover, the flag has an electrostatic charge and is blown by the source of compressed air, in such a way that it is completely extended along the first plane.

[0028] In an example, the control unit is programmed to keep the apparatus in the first operating configuration until a first switching condition occurs. The first switching condition corresponds to when the pre-stretched flag of film reaches a predetermined length. Alternatively, the first switching condition corresponds to when a predetermined first time interval passes. In this way, depending on the type of apparatus and the type of load to be wrapped, the control unit sets a predetermined quantity of film as a function of the specific application.

[0029] In an example, the control unit is programmed for setting the apparatus in a second operating configuration, in response to the first switching condition. In the second operating configuration, the control unit is programmed to deactivate the delivery mechanism. The control unit is programmed to control the actuator in such a way that the deflector is in the second position. In this manner, when the first switching condition occurs, the deflector is moved from the first position to the second position. In this manner, the deflector leaves the flag free to orient itself along the second plane and come into contact with the load. For this reason, the flag, charged electrostatically, may adhere to an outer surface of the load. These solutions have the advantage of dividing the operation for attaching the film to the load into two configurations. In one configuration, the film is oriented far from the load; in the other configuration, the movement of the deflector is such as to indirectly guide and / or accompany the film, leaving it free to orient towards the load, and allowing the attachment.

[0030] In an example, the control unit is programmed, in response to the first switching condition, to deactivate the electrostatic charger.

[0031] In this manner, in the second operating configuration, no electrostatic charge is applied to the film. It should be noted that when the head end of the film is delivered whilst the electrostatic charger is active, it maintains its electrostatic charge. This also applies if, upstream, the electrostatic charger is deactivated. The above is to be considered true until the state of the film, charged electrostatically, is disturbed by a contact between the film and the elements which can absorb the charge. For this reason, disabling the electrostatic charge upstream after a film has been delivered downstream with an electrostatic charge allows the film to retain its charge and, if necessary, attach to the load during the contact.

[0032] In an example, in the second operating configuration, the control unit is also programmed to keep the drive unit deactivated.

[0033] In this way, in the second operating configuration the delivery head is stationary relative to the load.

[0034] In an example, the control unit is programmed to keep the apparatus in the second operating configuration for a predetermined maintaining time interval. In this solution, in a similar manner to that provided by the first switching condition, the control unit is based on a time signal, in order to allow the operating configuration of the apparatus to be switched.

[0035] Alternatively, the control unit may be programmed to keep the apparatus in the second operating configuration until a second switching condition occurs.

[0036] In an example, the control unit is programmed for setting the apparatus in a third operating configuration, in response to the second switching condition. In the third operating configuration, the control unit is programmed to activate the drive unit. The control unit is programmed to activate the delivery mechanism, at least for a duration of a part of the third operating configuration. The control unit is programmed to activate the source of compressed air, at least for a duration of a part of the third operating configuration. This solution allows, in the third operating configuration, the relative movement between the delivery head and the load to be wrapped. For this reason, by moving reciprocally, the delivery head can wrap the load with the film.

[0037] In an example, the control unit is programmed for keeping the apparatus in the third operating configuration. The control unit is programmed for deactivating the delivery mechanism for a first portion of the duration of the third operating configuration. The control unit is programmed to activate the delivery mechanism for a second portion of the duration of the third operating configuration. In this way, in a first step the film is tensioned, since the delivery head is in relative motion with respect to the load and the delivery is deactivated. It should be noted that, when the delivery mechanism is set in the deactivated state, the film is not able to be extracted from the delivery head. This is due to the friction forces generated between the film and the plurality of rollers. In a second step, the film is free to be delivered and, in combination with the relative rotation, wrapped around the load.

[0038] In an example, the control unit is programmed to activate the source of compressed air. Moreover, the control unit is programmed for setting a speed of the flow of air of the source of compressed air to a reduced speed, with respect to the speed of the flow of air of the source of compressed air in the first operating configuration.

[0039] This solution is advantageous because the air flow, blown towards the film, prevents the film from being drawn towards the delivery mechanism. In other words, the air jet facilitates the delivery of the film. In effect, in the absence of the jet, due to the nature of the film and the nature of the delivery mechanism, the film could remain adherent to the delivery mechanism and be called back by the delivery mechanism. In an example, the flow of air blown by the source of compressed air towards the film has a minimum speed. The minimum speed is a speed set by the control unit. The minimum speed is included in a range of from 20% to 30% of an operational jet speed. Alternatively, the minimum speed may be within a different range, depending on the specific application and / or the specific apparatus and / or the specific load to be wrapped. The operational jet speed is the speed of the flow of air, blown by the source of compressed air, during a standard blowing condition. The operational jet speed may be the speed of the flow of air, blown by the source of compressed air, during the first and / or during the second operating configuration. Alternatively, the operational jet speed may be a further speed of the flow of air known to the control unit.

[0040] The advantage of setting a minimum speed as described lies in the fact that the control unit sets a speed which allows the problem of returning the film towards the delivery mechanism to be avoided. A further advantage relates to the fact that, by reducing the speed to a minimum value, the apparatus saves energy and optimises the employment of resources for supplying the source of compressed air and / or the apparatus.

[0041] In an example, the control unit is programmed for activating the electrostatic charger for at least a part of the duration of the third operating configuration wherein the delivery mechanism is active. In this way, the control unit can also activate, if required by the conditions, the electrostatic charger, and electrostatically charge the film.

[0042] In an example, the apparatus comprises a carriage. The drive unit, the delivery head, the source of compressed air, the electrostatic charger and the deflector are associated with the carriage to form a self-propelled robot. The self-propelled robot is able to move around the load. This solution constitutes an embodiment wherein the self-propelled robot is a compact structure which is able to wrap the film around the load, being able to move about it.

[0043] In an example, the control unit receives the start signal and sets the first operating configuration whilst the relative speed between the delivery head and the load is zero. In this example, in effect, the apparatus may be moved close to the load to be wrapped (manually or by means of the drive unit itself) and, once it has reached and stopped close to the load, the control unit may start the wrapping cycle.

[0044] In an alternative example, the control unit can control the delivery mechanism and / or the electrostatic charge and / or the air source whilst the relative speed between the delivery head and the load is different from zero. For example, the delivery mechanism may deliver a predetermined portion of film and, with the jet of air active, keep it delivered “in the form of a flag” whilst the drive unit moves the head towards the load. This has the advantage of reducing the cycle times (the film is attached with operation in progress) and prevents, before each wrapping, the apparatus from stopping in front of the load.

[0045] It should be noted that in the setting of the first operating configuration, the control unit is programmed for:

[0046] - deactivating the drive unit;

[0047] - controlling the actuator in such a way that the deflector is in the first position;

[0048] - activating the delivery mechanism, the electrostatic charger, activating the compressed air source;

[0049] In effect, in the first operating configuration, the flag is oriented along the first plane, in such a way that it does not make contact with the load. As described, the control unit may be configured to also activate, in the first operating configuration, the drive unit. The drive unit may impart to the delivery head a motion along a predetermined direction such that the plane along which the load is oriented (initially not interfering with the load, that is to say, in the first position) translates. By translating, the plane passes from the first position to the second position (in which it intersects the load), allowing the film to attach to the load.

[0050] Following the attachment, the control unit may command the drive unit to perform a predetermined number of wrapping revolutions.

[0051] In an example, the predetermined portion of film delivered by the delivery mechanism is oriented perpendicularly to the direction of movement imparted by the drive unit. It should be noted that, during the step of moving the head towards the load (and during the contact), the delivery mechanism has already delivered the predetermined portion; therefore, during the movement towards each other, the control unit may also disable the delivery mechanism.

[0052] In an example, the apparatus may include a detection sensor. In an example, the detection sensor is a photocell. The sensor is configured for detecting a contact between the film and the load. In an example, when the sensor detects the contact it can, without stopping the movement of the drive unit, re-activate the delivery mechanism (if it has been deactivated). In this way, the wrapping cycle occurs without stops, in a fluid and efficient manner.

[0053] According to one aspect of this invention, a method is provided for wrapping a load with a pre-stretched film. The method comprises a step of preparing an apparatus. The apparatus comprises a delivery head, provided with a delivery mechanism for delivering the film. The apparatus comprises a drive unit, for generating a relative movement between the delivery head and the load. The apparatus comprises a source of compressed air, for generating a flow of air towards the film delivered. The apparatus comprises an electrostatic charger, for applying an electrostatic charge to the film. The apparatus comprises a deflector, movable by an actuator between a first position and a second position. In the first position the deflector directs the flow of air to blow the film delivered along a first plane, the first plane being vertical and not intersecting the load. In the second position the deflector guides the flow of air for blowing the film delivered along a second plane, the second plane being vertical and intersecting the load. The apparatus comprises a control unit. The method comprises a step of controlling the actuator, by means of the control unit, for moving the deflector between the first position and the second position. The method comprises a step of enabling the relative movement between the delivery head and the load, using the control unit, in such a way as to wrap the load with the film, whilst the film is delivered.

[0054] In an example, the control unit receives and responds to a start signal. In response to the start signal, the control unit prepares the apparatus in a first operating configuration. In the first operating configuration, the drive unit is deactivated, in such a way that the delivery head is stationary relative to the load, the deflector is in the first position. Moreover, the delivery mechanism, the electrostatic charger and the source of compressed air are activated. During this step, the delivery head delivers a flag of pre-stretched film comprising a free head end of the film, oriented along the first plane.

[0055] In an example, the control unit keeps the apparatus in the first operating configuration until a first switching condition occurs. The first switching condition corresponds to when the pre-stretched flag of film reaches a predetermined length. Alternatively, the first switching condition corresponds to when a predetermined first time interval passes.

[0056] In an example, the control unit, in response to the first switching condition, prepares the apparatus in a second operating configuration. In the second operating configuration, the delivery mechanism is deactivated and the deflector is in the second position. Moreover, the control unit may activate the electrostatic charger.

[0057] In an example, the control unit keeps the apparatus in the second operating configuration for a predetermined maintaining time interval.

[0058] In an example, the control unit prepares the apparatus in a third operating configuration, in response to a second switching condition. In the third operating configuration the drive unit is active, in such a way that the delivery head is in relative movement with respect to the load. In the third operating configuration the delivery mechanism is active, at least for the duration of a part of the third operating configuration. In the third operating configuration the source of compressed air is active, at least for the duration of a part of the third operating configuration.

[0059] In an example, for a first portion of the duration of the third operating configuration, the delivery mechanism is deactivated, in such a way that the film is taut whilst the delivery head is in relative movement relative to the load. In an example, for a second portion of the duration of the third operating configuration, the delivery mechanism is active.

[0060] In an example, the source of compressed air is active for a part of the duration of the third operating configuration. The source of compressed air is active at a reduced speed. The speed is reduced compared to the first operating configuration.

[0061] Brief Description of the Drawings

[0062] These and other features of the invention will become more apparent from the following detailed description of a preferred, non-limiting example embodiment of it, with reference to the accompanying drawings, in which:

[0063] - Figure 1 illustrates an apparatus for wrapping a load with a pre-stretched film;

[0064] - Figures 2 and 3 show a delivery head with a deflector positioned in a first position and in a second position;

[0065] - Figures 4 and 5 show the delivery head with the deflector positioned in the first and in the second position, wherein elements inside the delivery head are visible;

[0066] - Figures 6 and 7 are a top view of the delivery head with the deflector positioned in the first and in the second position;

[0067] - Figure 8 is a top view of the delivery head with the deflector shown both in the first and in the second position;

[0068] - Figure 9 is a perspective view of the delivery head in which there are also a first plane, a second plane, the load.

[0069] - Figure 10 shows a first operating configuration, wherein the film is delivered far from the load;

[0070] - Figure 11 shows a second operating configuration, wherein the film is delivered towards the load;

[0071] - Figure 12 shows a third operating configuration, wherein the film is wrapped around the load;

[0072] Detailed description of preferred embodiments of the invention

[0073] The numeral 100 denotes an apparatus for wrapping a load 300 supported by a surface 310 with a pre-stretched film 200. Preferably, the load 300 is positioned above the surface 310. Preferably, the surface 310 is a pallet. Alternatively, the surface 310 is another means for supporting and / or transporting industrial products. The apparatus 100 comprises a delivery head 1. The delivery head 1 is provided with a delivery mechanism 2. The delivery mechanism 2 is configured for delivering the film 200 outside the delivery head 1. In particular, the delivery head 1 is configured for unwinding the film 200 from a state in which it is rolled in a reel to a state in which the film 200 is unwound in a continuous extended sheet. The delivery mechanism 2 comprises a plurality of rollers 20. At least one roller of the plurality of rollers 20 is motor-driven. In particular, the delivery mechanism 2 includes three pre-stretching rollers 21. The delivery mechanism 2 includes a control roller 22. The delivery mechanism 2 further includes two delivery rollers 23. The apparatus 100 comprises a drive unit. The drive unit is associated with the delivery head 1. Alternatively, the drive unit is associated with the load 300. The drive unit is configured to generate a relative motion between the delivery head 1 and the load 300. The relative motion is a rotational movement between the delivery head 1 and the load 300. According to an embodiment, wherein the drive unit is associated with the delivery head 1 , the delivery head 1 rotates about the load 100. In a different embodiment, wherein the drive unit is associated with the load 300, the load 300 is positioned on a platform which is able to rotate, whilst the delivery head 1 is fixed. The apparatus 100 comprises a source of compressed air 3. The source of compressed air 3 is configured to generate a flow of air. The source of compressed air 3 comprises fans 30. The fans 30 generate the flow of air, which blows the film 200. The flow of air touches the film 200 and allows the film 200 to remain extended. In the absence of the flow of air, the film 200 might fall downwards, folding or tangling on itself due to gravity. The apparatus 100 comprises an electrostatic charger 4. The electrostatic charger 4 is configured for applying an electrostatic charge to the film 200. The electrostatic charger 4 comprises an electrostatic bar and / or an electrostatic roller. The electrostatic charger is positioned along a first vertical axis. The plurality of rollers 20 is positioned along a second vertical axis. The first and the second vertical axes are parallel to each other. The electrostatic charger 4 applies the electrostatic charge to the film 200 when the film 200, delivered by the delivery head 1 , comes into contact with the electrostatic charger 4. The apparatus 100 comprises a deflector 5. The deflector 5 is movable between a first position and a second position. In the first position, the deflector orients the flow of air to blow the film 200 along a first plane P. The first plane P is a vertical plane. The first plane P is a plane which does not intersect the load 300. In the second position, the deflector orients the flow of air for blowing the film 200 along a second plane Q. The second plane Q is a vertical plane. The second plane Q is a plane which intersects the load 300. The apparatus comprises an actuator 6. The actuator 6 is configured to move the deflector 5 between the first position and the second position. Thus, the film 200 may be oriented, alternatively, along the first plane P or along the second plane Q. For this reason, the film 200 may be oriented in such a way as not to intersect, or not be in contact, with the load 300, or in such a way as to intersect, or be in contact, with the load 300. The first plane P and the second plane Q define an angle between each other a. Preferably, the angle a is an angle in the range of 0°<a<90°. The apparatus 100 comprises a control unit. The control unit is connected to the actuator 6. The control unit is configured to control the actuator 6 in such a way that the deflector 5 is moved between the first and second positions. The control unit is configured to control the delivery mechanism 2. The delivery mechanism 2 may be set, by the control unit, to an active state. In the active state, the delivery mechanism 2 is configured for delivering the film 200. The delivery mechanism 2 may be set, by the control unit, to a deactivated state. In the deactivated state, the delivery mechanism 2 is configured for not delivering the film 200. The control unit is configured to control the drive unit. The drive unit may be set, by the control unit, to an active state. In the active state, the drive unit is configured to enable the relative motion between the delivery head 1 and the load 300. The drive unit may be set, by the control unit, to a deactivated state. In the deactivated state, the drive unit is configured to disable the relative motion between the delivery head 1 and the load 300. The control unit is configured to control the source of compressed air 3. The source of compressed air 3 may be set, by the control unit, to an active state. In the active state, the source of compressed air 3 is configured to generate the flow of air. The source of compressed air 3 may be set, by the control unit, to a deactivated state. In the deactivated state, the source of compressed air 3 is configured to disable the jet of air. The control unit is configured for controlling the electrostatic charger 4. The electrostatic charger 4 may be set, by the control unit, to an active state. In the active state, the electrostatic charger 4 is configured for applying an electrostatic charge to the film 200. The electrostatic charger 4 may be set, by the control unit, to a deactivated state. In the deactivated state, the electrostatic charger 4 is configured to disable the application of the electrostatic charge to the film 200.

[0074] In an example, the control unit is configured for activating or deactivating the electrostatic charger 4 on the basis of a delivery signal. The delivery signal may indicate, alternatively, whether the state of the delivery mechanism 2 is active or de-active. If the delivery signal indicates that the state of the delivery mechanism 2 is active, that is, the film 200 is delivered, the control unit is configured for setting the electrostatic charger 4 in the active state. On the other hand, if the delivery signal indicates that the state of the delivery mechanism 2 is deactivated, that is, the film 200 is not delivered, the control unit is configured for setting the electrostatic charger 4 to the deactivated state. In other words, in the example described, the electrostatic charge is applied to the film 200 only when the film 200 is delivered.

[0075] In an example, the control unit is configured for activating or deactivating the electrostatic charger 4 on the basis of a time signal. In particular, the control unit is configured for activating or deactivating the electrostatic charger 4 after a predetermined period of time has passed. Alternatively, the control unit is configured for activating or deactivating the electrostatic charger 4 on the basis of a path signal. The path signal is based on the measurement of a space travelled by the delivery head. Alternatively, the path signal is based on the measurement of rotations of the load. The apparatus 100 may include a spatial measuring instrument. Preferably, the spatial measuring instrument is a phonic wheel.

[0076] In an example, the control unit is configured for detecting the attachment of the film 200 to the load 300. Preferably, the control unit is configured to receive an attachment signal from the control roller 22. In particular, if the film 200 presses on the control roller 22 the control unit receives the attachment signal. Vice versa, if the film 200 does not press on the control roller 22, that is, the attachment has not occurred, the control unit does not receive the attachment signal, but sends an alarm signal.

[0077] In an example, the apparatus 100 may have a switched off state, a switched on state and an operating state. In the switched off state, the control unit is switched off. Therefore, it is not possible to perform any operation. In the switched on state, the control unit is switched on. It is also possible to interact with the apparatus 100 through a control panel. The apparatus 100 may include manual commands configured to commands the movement of the delivery head 1 and load 300 towards each other. The apparatus 100 is set to the switched on state by means of a pushbutton. Alternatively, the apparatus is set to the switched on state by means of a selector switch. In the switched on state, the control unit is configured to perform an attachment assessment (A), on the basis of selected parameters. The attachment assessment (A) is a choice between proceeding with the wrapping or renouncing the wrapping. In an example, the attachment assessment (A) is performed by the user, and is communicated to the control unit by a pushbutton and / or a remote control and / or a control panel. In the switched on state, the control unit is configured for positioning the carriage (B) in a predetermined position. The predetermined position is the wrapping position provided for by the specific application, depending on the type of apparatus 100 and the type of load 300 to be wrapped. In the operating state it is programmed to receive a start signal. In response to the start signal, the control unit is programmed for setting the apparatus 100 to a first operating configuration. It should be noted that in order to receive the start signal, the control unit must have previously received a switching on signal. Once the apparatus 100 has been switched on, then the control unit can receive the start signal. The start signal may be a command given manually by an operator, or a remote command, for example by a remote control device, or a signal which may arrive by an exchange of information between further devices which collaborate with the apparatus 100, inside a work environment in which the apparatus 100 operates. In the first operating configuration, the control unit is configured for deactivating the drive unit, activating the delivery mechanism 2 (D, E), activating the source of compressed air 3 (C) and activating the electrostatic charger 4. The control unit is also configured to command the actuator 6 to move the deflector 5 to the first position. The first operating configuration is an extraction step. During the extraction step, the film 200 is delivered, electrostatically charged and blown to stretch it, while the deflector 5 orients it away from the load 300. The control unit is programmed for keeping the apparatus 100 in the first operating configuration until there is a first switching condition. The first switching condition occurs when the film 200 delivered reaches a predetermined length. Alternatively, the first switching condition occurs when a predetermined first time interval passes. Preferably, the first predetermined time interval is a time interval set by the operator.

[0078] In an example, the control unit is programmed for setting the apparatus 100 to a second operating configuration, in response to the first switching condition. The control unit is programmed for deactivating the delivery mechanism 2, stopping the delivery of the film 200. Also, the control unit is programmed to control the actuator 6 in such a way as to move the deflector 5 to the second operating position. The second operating configuration is an attachment step (G). In the attachment step (G), by moving the deflector 5, the film 200 is free to be oriented towards the load 300.

[0079] In an example, there is a pause (F) between the first and second operating configurations.

[0080] In an example, the control unit is programmed to keep the apparatus 100 in the second operating configuration for a predetermined maintaining time interval. Preferably, the predetermined maintaining time interval is a time interval set by the operator.

[0081] In an example, the control unit is programmed to keep the apparatus 100 in the second operating configuration until there is a second switching condition. Thus, the attachment step is the step wherein the delivery head 1 orients the flag of film 200 delivered, charged electrostatically, in such a way that it makes contact with the load 300. The electrostatic charge is applied to the film 200 in such a way that, upon contact with the load 300, the film 200 adheres to the load 300.

[0082] In another example, in response to the first switching condition, the control unit is configured for deactivating the electrostatic charger 4 and not applying any electrostatic charge to the film 200.

[0083] In a further example, in response to the first switching condition, the control unit is configured for keeping the drive unit deactivated, in such a way that the delivery head 1 and the load 300 are not moving relative to each other.

[0084] In an example, the control unit is programmed for setting the apparatus 100 to a pause operating configuration (H). The pause operating configuration (H) can be set by the control unit in response to the second switching condition. In the pause operating configuration (H), the control unit is programmed to keep the deflector 5 in the second position and deactivate the delivery mechanism 2, the drive unit, the source of compressed air 3.

[0085] In an example, the control unit is programmed for setting the apparatus 100 to a third operating configuration, in response to the second switching condition. The control unit is programmed for activating the drive unit, in such a way as to enable the relative movement between the delivery head 1 and the load 300 (I). The third operating configuration is a wrapping step. The control unit is programmed to activate the delivery mechanism 2 (L, M) at least for a duration of a part of the third operating configuration. The control unit is programmed to activate the source of compressed air 3 at least for a duration of a part of the third operating configuration.

[0086] In an example, in the third operating configuration, the control unit is programmed to keep the drive unit active and deactivate the delivery mechanism 2, for a first portion of the duration of the third operating configuration.

[0087] It should be noted that, when the delivery mechanism 2 is set to the deactivated state, the film 200 is not able to be extracted from the delivery head 1 . This is due to the friction forces which are generated between the film 200 and the plurality of rollers 20.

[0088] Alternatively, the control unit is programmed to keep the drive unit active and activate the delivery mechanism 2, for a second portion of the duration of the third operating configuration.

[0089] The third operating configuration or wrapping step may comprise two different sub-configurations. In one, the delivery head 1 and the load 300 are moving relative to each other whilst the film 200 is not delivered. For this reason, the film 200 is tensioned, since the free head end of the film 200 remains adherent and fixed to the load 300. In the other, the delivery head 1 and the load 300 are moving relative to each other whilst the film 200 is delivered. Thus, the film 200 is wrapped around the load. With a succession of wrapping revolutions, the load 300 may be wrapped with the film 200 by means of layers of film 200 superposed on each other and / or by wrapping the load 300 along a height dimension.

[0090] In an example, the control unit is further configured to keep the drive unit active and deactivate the source of compressed air 3. Alternatively, the control unit is configured to keep the drive unit active and activate the source of compressed air 3. The source of compressed air 3 may be activated at a reduced speed. The speed is reduced relative to an operational jet speed. The operational jet speed is the speed of the jet during a standard jet condition. A standard jet condition may be the first and / or the second operating configuration.

[0091] In an example, the speed of the flow of blown air towards the film 200 is included in a range of from 20% to 30% of the operational jet speed.

[0092] In an example, the control unit is programmed for activating the electrostatic charger 4 for at least a part of the duration of the third operating configuration wherein the delivery mechanism 2 is active. Once the wrapping operations have been completed, the control unit is configured for setting the apparatus 100 in an end state (F). Subsequently, the control unit and / or the operator can set the apparatus 100 in the switched off state.

[0093] In an example, the apparatus 100 comprises a carriage 101. The drive unit, the delivery head 1 , the source of compressed air 3, the electrostatic charger 4 and the deflector 5 are associated with the carriage 101 to form a self-propelled robot 10. The robot 10 is able to move around the load 300. The robot 10 is provided with a vertical pole. The delivery head 1 is configured for sliding vertically along the pole. The carriage 101 is provided with at least one motor-driven wheel. The carriage 101 is provided with at least one steering wheel. The carriage 101 is provided with a contact member, to contact the load 300. In an example, the control unit is associated with the robot 10. For example, the control unit is installed on board the robot 10. In another example, the control unit is installed outside the robot 10. In a further example, the control unit is associated with the apparatus 100. In an example, the robot is powered by at least one electric battery.

[0094] In a preferred embodiment, the operating sequence which the robot performs is that shown in the tables below.

[0095] The following sections, listed in alphanumeric order for reference, are nonlimiting example modes of describing the invention.

[0096] A. An apparatus (100) for wrapping a load (300) supported by a surface with a film (200), the apparatus (100) comprising:

[0097] - a delivery head (1 ), provided with a delivery mechanism (2) configured for delivering the film (200) outside the delivery head (1 );

[0098] - a drive unit, for generating a relative motion between the delivery head (1 ) and the load (300);

[0099] - a source of compressed air (3), configured to generate a flow of air in such a way that the flow of air blows the film (200) delivered;

[0100] - a control unit.

[0101] A1. The apparatus according to paragraph A, comprising an electrostatic charger (4), configured for applying an electrostatic charge to the film (200).

[0102] A2. The apparatus according to one or more of paragraphs A or A1 , comprising:

[0103] - a deflector (5), movable between a first position, wherein the deflector orients the flow of air for blowing the film (200) delivered along a first plane (P), the first plane (P) being vertical and not intersecting the load (300), and a second position, wherein the deflector orients the flow of air for blowing the film (200) delivered along a second plane (Q), the second plane (Q) being vertical and intersecting the load (300);

[0104] - an actuator (6), configured to move the deflector (5) between the first position and the second position, wherein the control unit is connected to the actuator (6) and configured to control the actuator (6) in such a way that the deflector (5) is moved between the first position and the second position.

[0105] A2.1. The apparatus (100) according to paragraph A2, wherein the control unit is programmed to receive a start signal, and, in response to the start signal, sets the apparatus (100) to a first operating configuration, wherein:

[0106] - the drive unit is deactivated, in such a way that the delivery head (1 ) is stationary relative to the load (300);

[0107] - the deflector (5) is in the first position;

[0108] - the delivery mechanism (2) and the source of compressed air (3) are active, in such a way that a flag of film is delivered comprising a free head end, oriented along the first plane (P).

[0109] A2.1.1. The apparatus (100) according to paragraph A2.1 in combination with paragraph A1 , wherein, in the first operating configuration, the electrostatic charger (4) is active, in such a way that the flag of film delivered, oriented along the first plane (P), is electrostatically charged.

[0110] A2.2 The apparatus (100) according to any one of paragraphs A2.1 or A2.1.1 , wherein, in response to the start signal, the control unit is programmed to keep the apparatus (100) in the first operating configuration until there is a first switching condition.

[0111] A2.2.1 . The apparatus (100) according to paragraph A2.2, wherein the first switching condition is one of the following conditions:

[0112] - the flag of film (200) reaches a predetermined length;

[0113] - a predetermined first time interval is passed.

[0114] A2.2.2. The apparatus (100) according to paragraph A2.2 or A2.2.1 , wherein the control unit is programmed for setting the apparatus (100) to a second operating configuration, in response to the first switching condition, wherein, in the second operating condition:

[0115] - the delivery mechanism (2) is deactivated, in such a way that the delivery of the film (200) is stopped;

[0116] - the deflector (5) is in the second position, in such a way that the flag is oriented along the second plane (Q) against the load (300) and in such a way that the flag, charged electrostatically, adheres against the load.

[0117] A2.2.2.1 . The apparatus (100) according to any one of paragraphs A2.2 or A2.2.2 in combination with paragraph A1 , wherein, in response to the first switching condition, the control unit is configured to deactivate the electrostatic charger (4), so that, in the second operating configuration, the electrostatic charger (4) is deactivated, and no electrostatic charge is applied to the film.

[0118] A2.2.2.2. The apparatus (100) according to any one of paragraphs A2.2.2 to A2.2.2.1 , wherein, in the second operating configuration, the drive unit is kept deactivated, in such a way that the delivery head (1 ) is stationary relative to the load (300).

[0119] A2.2.3 The apparatus (100) according to any one of paragraphs A2.2.1 to A2.2.2.2, wherein the control unit is programmed for keeping the apparatus (100) in the second operating configuration for a predetermined maintaining time interval.

[0120] A2.3 The apparatus (100) according to any one of paragraphs A2 to A2.2.3, wherein the deflector and the actuator correspond to the delivery head (1 ), the delivery head being configured to move between the first position and the second position, to orient the flow of air between the first plane and the second plane. A2.4 The apparatus (100) according to one or more of the paragraphs from A2 to A2.2.3, wherein the deflector includes a fin, and wherein the actuator is configured for moving the fin between the first and the second position.

[0121] A2.5 The apparatus (100) according to any one of paragraphs A2 to A2.2.3, comprising a carriage (101), wherein the drive unit, the delivery head (1) and the source of compressed air (3) are associated with the carriage (101) to form a self-propelled robot (10), the robot (10) being able to move around the load (300), and wherein the deflector corresponds to the delivery head and the actuator corresponds to the drive unit, and wherein the robot is configured for moving along a path of movement relative to the load and, by moving the robot, orienting the flag of film between the first plane and the second plane.

[0122] A.3 The apparatus (100) according to any one of paragraphs A2.2.1 to A2.2.3, wherein the control unit is programmed for setting the apparatus (100) to a third operating configuration, in response to a second switching condition, wherein, in the third operating configuration:

[0123] - the drive unit is active, in such a way that the delivery head (1 ) is in motion relative to the load (300);

[0124] - the delivery mechanism (2) is active, at least for a duration of a part of the third operating configuration;

[0125] - the source of compressed air (3) is active, at least for a duration of a part of the third operating configuration.

[0126] A.3.1. The apparatus (100) according to paragraph A.3, wherein, in the third operating configuration, the control unit is programmed for setting the apparatus (100) as follows:

[0127] - for a first portion of the duration of the third operating configuration, the delivery mechanism (2) is deactivated, in such a way that the film is taut whilst the delivery head 1 is in relative movement relative to the load (300).

[0128] - for a second portion of the duration of the third operating configuration, the delivery mechanism (2) is active.

[0129] A.3.1.1 The apparatus (100) according to any one of paragraphs A.3 or A.3.1 , wherein the control unit is programmed to activate the source of compressed air (3) at least for a part of the duration of the third operating configuration, at a reduced speed, with respect to the first operating configuration.

[0130] A.3.2. The apparatus (100) according to any one of paragraphs A.3 or A.3.1.1 in combination with paragraph A1 , wherein the control unit is programmed for activating the electrostatic charger (4), for at least a part of the duration of the third operating configuration wherein the delivery mechanism (2) is active.

[0131] A4. The apparatus (100) according to any one of paragraphs A to A.3.2, comprising a carriage (101), wherein the drive unit, the delivery head (1) and the source of compressed air (3) are associated with the carriage

[0132] (101 ) to form a self-propelled robot (10), the robot (10) being able to move around the load (300). A.4.1. The apparatus (100) according to paragraph A4, wherein the robot (10) comprises an electrostatic charger (4), configured for applying an electrostatic charge to the film (200).

[0133] A4.1.1 The apparatus (100) according to paragraph A4 or A4.1 , wherein the robot (10) comprises:

[0134] - a deflector (5), movable between a first position, wherein the deflector orients the flow of air for blowing the film (200) delivered along a first plane (P), the first plane (P) being vertical and not intersecting the load (300), and a second position, wherein the deflector orients the flow of air for blowing the film (200) delivered along a second plane (Q), the second plane (Q) being vertical and intersecting the load (300);

[0135] - an actuator (6), configured to move the deflector (5) between the first position and the second position, wherein the control unit is connected to the actuator (6) and configured to control the actuator (6) in such a way that the deflector (5) is moved between the first position and the second position.

[0136] A5. The apparatus (100) according to one or more of paragraphs A to A.4.1.1 , wherein the film is a pre-stretched film.

Claims

CLAIMS1. An apparatus (100) for wrapping a pre-stretched film (200) around a load (300) supported by a surface, the apparatus (100) comprising:- a delivery head (1), provided with a drive mechanism (2) adapted to dispense the pre-stretched film (200) out of the delivery head (1 );- a motorization for generating a relative motion between the delivery head (1 ) and the load (300);- a source of pressured air (3) for generating an air flow so that the air flow blows the dispensed film (200);- an electrostatic charger (4), configured to apply an electrostatic charge to the film (200);- a deflector (5), movable between a first position, wherein the deflector directs the air flow for blowing the dispensed film (200) along a first plane (P), the first plane (P) being vertical with no intersection with the load (300), and a second position, so that the air flow blows the dispensed film (200) along a second plane (Q), the second plane (Q) being vertical and intersecting the load (300);- an actuator (6), configured for moving the deflector (5) between the first and the second position;- a control unit, connected to the actuator (6) for controlling the actuator (6) so that the deflector (5) is moved between the first position and the second position.

2. The apparatus (100) according to claim 1 , wherein the control unit is programmed for receiving a start command, and, responsive to the start command, setting the apparatus (100) in a first working configuration, wherein:- the motorization is set to an inactive state, so that the delivery head (1) is stationary with respect to the load (300);- the deflector (5) is set in the first position;- the drive mechanism (2), the electrostatic charger (4) and the source of pressured air (3)are all activated, so that a flag of pre-stretched filmincluding a head free end of the film (200) is provided, oriented along the first plane (P).

3. The apparatus (100) according to claim 2, wherein, responsive to the start command, the control unit is programmed for holding the apparatus (100) in the first working configuration until a first commutation condition is met, the first commutation condition being either of the following conditions:- the flag of pre-stretched film (200) reaches a predetermined length;- a first predetermined time interval has lapsed.

4. The apparatus (100) according to claim 3, wherein the control unit is programmed for setting the apparatus (100) in a second working configuration, responsive to the first commutation condition, wherein, in the second working configuration:- the drive mechanism (2) is inactive, so that the film (200) dispensing is stopped;- the deflector (5) is set in the second position, so that the flag is oriented along the second plane (Q) against the load (300) and so that the flag, electrostatically charged, adheres to the load.

5. The apparatus (100) according to claim 4, wherein, responsive to the first commutation condition, the control unit deactivates the electrostatic charger (4), whereby, in the second working configuration, the electrostatic charger (4) is deactivated, and no electrostatic charge is applied to the film.

6. The apparatus (100) according to claim 4 or 5, wherein, in the second working configuration, the motorization is kept in the inactive state, so that the delivery head (1 ) is stationary with respect to the load (300).

7. The apparatus (100) according to any of the claims from 4 to 6, wherein the control unit is programmed for holding the apparatus (100) in the second working configuration for a predetermined hold time interval.

8. The apparatus (100) according to any of the claims from 4 to 7, wherein the control unit is programmed for setting the apparatus (100) in a thirdworking configuration, responsive to a second commutation condition, and wherein, in the third working configuration:- the motorization is set to an active state, so that the delivery head (1 ) is in relative motion with respect to the load (300);- the drive mechanism (2) is active, at least for part of a duration of the third working configuration;- the source of pressured air (3) is active, at least for part of the duration of the third working configuration.

9. The apparatus (100) according to claim 8, wherein, in the third working configuration, the control unit is programmed for setting the apparatus (100) as follows:- for a first portion of the duration of the third working configuration, the drive mechanism (2) is inactive, so that the film (200) is tensioned while the delivery head (1 ) is in relative motion with respect to the load (300);- for a second portion of the duration of the third working configuration, the drive mechanism (2) is active.

10. The apparatus (100) according to claim 8 or 9, wherein the control unit is programmed for activating the source of pressured air (3), at least for a part of the duration of the third working configuration, at a reduced rate, with respect to the first working configuration.

11. The apparatus (100) according to any of claims from 8 to 10, wherein the control unit is programmed for setting the electrostatic charger (4) in active state, for the at least a part of the duration of the third working configuration wherein the drive mechanism (2) is active.

12. The apparatus according to any of the preceding claims, comprising a carriage (101 ), wherein the motorization, the delivery head (1), the source of pressured air (3), the electrostatic charger (4) and the deflector (5) are associated to the carriage to constitute a self-propelled robot (10), the robot (10) being capable of moving around the load (300).

13. A method for wrapping a load (300) with a pre-stretched film (200), comprising the following steps:- providing an apparatus (100), including: a delivery head (1 ), provided with a drive mechanism (2) for dispensing the film (200), a motorization for generating a relative motion between the delivery head (1) and the load (300), a source of pressured air (3) for generating an air flow towards the dispensed film (200), an electrostatic charger (4), for applying an electrostatic charge to the film (200), a deflector (5), movable through a actuator (6) between a first position, wherein the deflector (5) directs the air flow for blowing the dispensed film (200) along a first plane (P), the first plane (P) being vertical with no intersection with the load (300), and a second position, so that the air flow blows the dispensed film (200) along a second plane (Q), the second plane (Q) being vertical and intersecting the load (300); a control unit;- by the control unit, controlling the actuator (6) to move the deflector (5) between the first position and the second position;- by the control unit, enabling the relative motion between the delivery head (1 ) and the load (300), while the film (200) is dispensed, to wrap the load (300) with the film (200).

14. The method according to claim 13, comprising the following steps:- the control unit receives a start command;- responsive to the start command, the control unit sets the apparatus (100) in a first working configuration, wherein: the motorization is inactive, so that the delivery head (1) is stationary with respect to the load (300); the deflector (5) is in the first position; the drive mechanism (2), the electrostatic charger (4) and the source of pressured air (3) are activated, thereby providing a flag of pre-stretched film (200) including a head freeend of the film (200), oriented along the first plane (P).

15. The method according to claim 14, wherein the control unit holds the apparatus (100) in the first working configuration until a first commutation condition is met, the first commutation condition being either of the following conditions:- the flag of pre-stretched film (200) reaches a predetermined length;- a first predetermined time interval has lapsed.

16. The method according to claim 15, wherein the control unit, responsive to the first commutation condition, sets the apparatus (100) in a second working configuration, wherein:- the drive mechanism (2) is inactive, so that the film (200) dispensing is arrested;- the deflector (5) is set in the second position, so that the flag is oriented along the second plane (Q) against the load (300);- the electrostatic charger (4) is inactive.

17. The method according to any of the claims 14 to 16, wherein the control unit sets the apparatus in a third working configuration, responsive to a second commutation condition, wherein, in the third working configuration:- the motorization is set to an active state, so that the delivery head (1 ) is in relative motion with respect to the load;- the drive mechanism (2) is active, at least for part of a duration of the third working configuration;- the source of pressured air (3) is active, at least for part of the duration of the third working configuration.

18. The method according to claim 17, wherein, in the third working configuration, the control unit:- for a first portion of the duration of the third working configuration, sets the drive mechanism (2) in the inactive state;- for a second portion of the duration of the third working configuration, sets the drive mechanism (2) in the active state and sets the source ofpressured air (3) in an active state, at a reduced rate, with respect to the first working configuration.

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