Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
  • B65B11/02—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders
  • B65B11/025—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders by webs revolving around stationary articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
  • B65B11/58—Applying two or more wrappers, e.g. in succession
  • B65B11/585—Applying two or more wrappers, e.g. in succession to stacked articles, e.g. pallettised loads

Definitions

• the invention relates to a wrapping process and to a wrapping machine capable of implementing such a process.
• a load such as a package or a pallet is transported from its manufacturing site to a distribution area. During this transport, the load must be protected against dust and possibly against humidity. A step of protection by covering the side walls of the load with a plastic film, also called wrapping, is carried out.
• a plastic film is unwound from its support in order to continuously cover the side walls of the load to be protected by means of turns.
• the covering methods include a first step of forming a first set of ascending turns from the bottom of the load to the top of the load.
• the cover is cut and then installed and possibly blocked on the top of the load.
• the cover is locked against the side walls by making at least one turn of plastic film.
• a welding step is then carried out so as to seal a lower turn covering the side walls and a first plastic film deposited under the load in order to form an integral waterproof protective envelope.
• Document WO 00/53498 proposes to provide a load covered by a set of turns.
• the load protected on its side faces is covered by a cover installed laterally on the top of the load by means of a telescopic arm. Once the cover is installed, it is fixed by welding or glue which makes this operation complicated to manage.
• the documents GB 2192853 and US 5,819,503 disclose a machine in which the load to be protected is mounted on a turntable. This configuration is not advantageous because the load turns on itself.
• Document GB 2192853 deposits the cap on the top of the load before forming the turns on the side walls which prevents forming a sealed envelope.
• Document US Pat. No. 5,819,503 proposes to deposit the cover upstream of the equipment forming the turns on the walls of the load, which implies the formation of a cover that descends strongly on the side walls of the load as well as a slow movement of the load. load so as not to drop the fairing. This also implies a significant footprint with equipment that deposits the fairing next to an equipment which ensures the wrapping.
• EP 1 149767 discloses the formation of a series of ascending turns on a load to the top before covering the top with a cap.
• the turns are formed by a rotation arm fixed above the cuff placement device. It appears that this configuration is not optimized in the management of the fairing.
• the wrapping device is remarkable in that it comprises:
• a cover installation device configured to hold a cover in a standby position and place the cover on the top of the load, the cover partially covering at least one side wall of the load
• the covering means form a first series of ascending turns on the side walls of the load from a lower part of the load to an upper part of the load
• o the fairing installation device places the fairing above of the top of the load in the standby position when the first series of ascending turns reaches the top of the load
• o the fairing installation device places the fairing on the top of the load, the fairing covering the top of the load. the load and coming into contact with at least one turn of the first series of ascending turns, said at least one turn of the first series of ascending turns separating the cover and the side wall of the load, where the covering means form a second series of turns blocking the cap against said at least one turn of the first series of ascending turns.
• control circuit is configured so that the cap placement device places the cap against the top of the load when the first series of ascending turns reaches the top of the load.
• control circuit is configured so that the cap placement device presses the cap against the top of the load before the formation of the first series of ascending turns.
• the cap placement device is configured so that, in the standby position, at least two opposite ends of the cap face upward.
• the cap placement device is configured so that, in the standby position, the cap is stretched.
• the cap placement device is configured to install the cap in the standby position by means of a clamp which pulls one end of the cap from a cap reservoir to a standby position. the clamp, the clamp moving along a rail.
• the cap placement device is configured to apply a force to the cap, said force opposing the movement of the clamp so as to tension the cap.
• the cap is stretched by means of a roller pressing on a support, the cap separating the support and the roller.
• the covering means move around the load during the formation of the series of turns according to a path defining a ring around the load in a horizontal section plane and in which the device for installing the cap is included inside the ring.
• the placement device comprises a plastic film reservoir forming the cap.
• the plastic film reservoir forming the cap prefferably includes at least one set of fingers configured to extend vertically downward and without contact with the sidewalls of the load so that the set of fingers is disposed between the cap and the second series of turns during the formation of the second series of turns.
• the cap placement device comprises a series of nozzles configured to apply a gas jet on the cap towards the foot of the load.
• Another object of the invention is a wrapping process which is faster than the prior art methods for attaching a cap to the top of a load.
• the wrapping process is remarkable in that it includes:
• the wrapping process is remarkable in that the fairing is disposed just above the top of the load when the first series of upward turns reaches the top of the load.
• Figure 1 shows a schematic view of a wrapping device according to the invention
• FIG. 2 represent schematic views of a wrapping device according to a first step of a wrapping process
• FIG. 3 is a schematic view of a wrapping device according to a second step of a wrapping process
• FIG. 4 shows a schematic view of a wrapping device according to a third step of a wrapping process
• FIG. 5 shows a schematic view of a wrapping device according to a fourth step of a wrapping process
• FIG. 6 shows a schematic view of a wrapping device according to a fifth step of a wrapping process
• FIG. 7 shows a schematic view of a wrapping device according to a sixth step of a wrapping process
• FIG. 8 is a schematic view of a wrapping device according to a seventh step of a wrapping process
• FIG. 9 is a schematic view of a wrapping device according to an eighth step of a wrapping process.
• Figure 10 is a schematic view of a cap placement device suitable for use in a wrapping device
• FIG. 11 represents a schematic view of the cap placement device according to a first step of a wrapping process
• FIG. 12 represents a schematic view of a wrapping device according to a first step of a wrapping process
• FIG. 13 represents a schematic view of a wrapping device according to a second step of a wrapping process
• FIG. 14 shows a schematic view of a wrapping device according to a third step of a wrapping process
• FIG. 15 represents a schematic view of a wrapping device according to a fourth step of a wrapping process
• FIG. 16 represents a schematic view of a wrapping device according to a fifth step of a wrapping process
• FIG. 17 represents a schematic view of a wrapping device according to a sixth step of a wrapping process
• FIG. 18 shows a schematic view of a wrapping device according to a seventh step of a wrapping process
• Figures 19 and 20 show schematic views of another wrapping device.
• the cap is formed and installed after the formation of a first set of upward turns which reaches the top of a load.
• the equipment forming the turns is stopped and plastic film is pulled from one side of the wrapper. This film is cut to form the cap.
• the inventors propose a new wrapping device making it possible to form this envelope as illustrated in FIG. 1 in a particular embodiment.
• the inventors propose a new organization of the steps of the covering process to form an upper envelope as is proposed in a particular embodiment illustrated in FIGS. 2 to 9.
• Load 1 can be protected by an upper casing which covers the top of load 1 and the side walls.
• load 1 is protected by an integral casing which protects all faces of load 1.
• the covering of the side walls is achieved by means of a first series of ascending turns 2 which extends from a lower part of the load to an upper part of the load.
• the first series of ascending turns 2 starts at the foot of the load 1 to reach the top of the load 1.
• Each turn partially covers the previous turn so as to form a side wall which makes the water run off which is deposited on the side walls.
• the turns are formed by a plastic film which is waterproof, the water which is projected against the side walls does not pass through the film. Under the effect of gravity, the water falls along the coils. The direction of overlap of the turns causes the water to pass from turn to turn without being able to reach the side walls of the load. The turns cover the side walls of the load.
• a cover 3 is deposited so as to cover the top of the load 1 as well as the upper part of the side walls.
• the cover 3 partially covers the first series of ascending turns 2 to come into contact with at least the last turn of the first series of ascending turns 2.
• the cover 3 is fixed by one or more turns, for example arranged in the form of a band or a second series of ascending turns.
• the cover 3 is mechanically fixed to the side walls of the load 1 above the first series of ascending turns by means of the second series of turns.
• the load 1 to be protected is deposited on a first plastic film (not shown).
• the first plastic film will protect the bottom of the load from external aggressions, for example water and dust.
• the first plastic film is deposited on a support.
• the load 1 to be protected is deposited on the first plastic film which is deposited on the support so that the first plastic film separates the load 1 and the support.
• the support can be made of various materials which are not impervious to dust and humidity.
• a weld can be made between the first plastic film and the turns of the side walls to make the integral protection waterproof.
• the wrapping device comprises a device 4 for placing a cap 3 which is configured to hold a cuff in a standby position and dispose the cuff on top of the load. It also comprises means 5 for covering the side walls of the load 1 configured to form series of turns around the side walls of the load by means of a film.
• the covering means will form at least a first series of ascending turns 2 by means of a film from a foot of the load 1 to the top of the load 1 and a second series of ascending turns 6.
• the wrapping device also comprises a control circuit configured to control the movement of the device 4 for placing the cover 3 and its actuation.
• the control circuit is also configured to control the covering means 5 of the side walls of the load 1.
• the control circuit is configured so that:
• the covering means form a first series of ascending turns on the side walls of the load from a lower part of the load to an upper part of the load, - the fairing installation device places the fairing above the top of the load in the waiting position when the first series of ascending turns reaches the upper part of the load,
• the cover installation device deposits the cover on the top of the load, the cover covering the top of the load and coming into contact with at least one turn of the first series of ascending turns, said at least one turn of the first series of ascending turns separating the fairing and the side wall of the load,
• the covering means form a second series of turns blocking the cap against said at least one turn of the first series of ascending turns.
• the control circuit is configured so that the device 4 for placing the cap 3 is placed just above the top of the load 1 when the first series of ascending turns 2 reaches the top of the load.
• the cap 3 is prepared and is ready to be placed on the top of the load once the load 1 is in its working position, that is to say in the position allowing the formation. of a first series of ascending turns.
• the fairing is not placed on the top of the load by other equipment before reaching the working position. This makes it possible to reduce the footprint of the wrapping device.
• the cover 3 is in a standby position in which the cover 3 is just above the top of the load 1.
• just above the top of the load 1 is meant that the cover 3 can be pressed against the top of the load 1 or that the fairing 3 is placed a few centimeters above the top of load 1 preferably less than 20cm above the top of load 1.
• the cover 3 When the cover 3 is just above the load 1, the area occupied by the cover 3 can completely cover the top of the load 1 or partially cover the top of the load 1.
• the cover 3 completely or partially covers the top of the load 1 in a vertical direction of observation.
• the partial coverage of the top of the load by the cap 3 represents at least 50% of the surface of the load 1 according to a horizontal section plane in order to facilitate the precise placement of the cap if necessary.
• the cap 3 is formed and is in the standby position before the load 1 reaches its working position, that is to say the position where the first series of turns 2 is formed.
• the fairing 3 is formed and is in the standby position when the load 1 moves below the fairing 3.
• the cap 3 is pressed against the top of the load 1 and is in the waiting position before initiating the formation of the first set of ascending turns 2.
• the load 1 is installed in the working position and the cover 3 reaches the waiting position during the formation of the first series of ascending turns 2.
• the cap 3 is pressed against the top of the load 1 when the first series of ascending turns 2 reaches the upper part of the load, for example the top of the load 1.
• the first series of ascending turns may end at the top or below the top of the load. It is also possible to provide that the first series of ascending turns partially covers the top face. of the load. This latter configuration is possible when the turns are formed with a stretched film which will retract on the top of the load.
• the cap 3 advantageously has a U-shape along two perpendicular cutting planes which comprise the vertical direction.
• the edges of the cap 3 are substantially horizontal or are directed downwards. These embodiments are more difficult to industrialize. It is possible to press the cover 3 against the top of the load when the first ascending turns 2 are formed and advantageous to raise the cover 3 when the turns reach the top of the load 1. It is still possible to provide that the turns are formed without the cap 3 being in contact with the top of the load 1 and possibly with the use of a minimum threshold distance which ensures non-contact between the turns and the edges of the cap 3.
• a first set of descending turns is advantageously formed so as not to interfere with the placement of the cover 3 on the side walls.
• the first set of descending turns covers the first set of ascending turns.
• the turns of the first set of descending turns may be contiguous or not overlap.
• the plastic film forming the first series of ascending turns 2 is cut.
• the cap 3 is placed on the top of the load 1 during the formation of the first series of descending turns without being installed.
• the cover 3 is then installed so as to partially cover at least one turn of the first series of ascending turns on the side walls of the load 1.
• the cover 3 being already placed on standby above the load 1, it is possible to install the cover 3 very quickly.
• the cover 3 can be brought into contact with the top of the load 1 and the edges of the cover 3 are then released from the placement means 4. If the cap 3 is already in contact with the top of the load, 1 it suffices to free the edges of the cap 3, which represents a significant time saving with respect to the methods of the prior art.
• a second series of descending turns is subsequently formed, which advantageously descends to the foot of the load 1.
• a first step of welding the last turns of the second series of descending turns is advantageously carried out to block the plastic film against the side walls and release the load 1.
• a second welding step is advantageously carried out so as to form an integral sealed envelope by reacting the plastic film covering the side walls and the first plastic film which covers the bottom. It is still possible to make the second weld before the first weld. If the first plastic film is not useful, this second soldering step is not performed.
• the means 5 for covering the side walls of the load 1 are configured to form several turns which cover the side walls of the load 1. It is particularly advantageous to provide that the covering means 5 of the side walls are mounted to move relative to the load 1 so as to rotate around the side walls of the load 1. In this way, it is easier to achieve complete recovery of the load 1. It is particularly advantageous to use a fixed load 1 when covering the side walls because this reduces the risks of deterioration of the load compared to a rotating load.
• the wrapping device comprises a frame provided with several feet 7 which support a plate 8.
• the covering means 5 are fixed to the plate 8 and they are arranged to move vertically. so as to form sets of ascending turns, for example from the foot of the load 1 to the top of the load 1, or sets of descending turns, for example from the top of the load 1 to the foot of the load 1.
• Other embodiments are also possible which do not use the plate 8 or which do not link the plate 8 with the covering means 5.
• the covering means 5 comprise a ring 10 which completely surrounds the load 1 to be protected in a horizontal section plane.
• the ring 10 forms a circulation path for a supply device 1 1 of the plastic film forming the turns.
• the device 11 for supplying the plastic film turns around the load 1 so as to form the turns.
• the supply device 1 1 is shown in the form of a roller serving as a reservoir for the plastic film forming the turns. It is also possible that the supply device 1 1 comprises a plastic film stretching system configured to stretch the plastic film present in the reservoir before or during the formation of the turns.
• the ring 10 is arranged to move vertically and form ascending or descending turns or even horizontal turns.
• the altitude of the ring 10 can be modified by means of an actuator 9 mounted on the plate 8, for example by means of a motor, a jack or any equivalent device.
• the ring 10 can be replaced by a rotatably mounted arm which can move vertically or on which the supply device 1 1 is movable vertically.
• the positioning means 4 of the cover 3 are configured to place the cover 3 above the load 1 and to install the cover 3 on the top of the load 1, preferably by pressing the cover 3 against the top of the load 1.
• the placement means 4 of the cover 3 are fixed to the plate 8 and are arranged to move vertically so as to approach or move away from the top of the load 1 and thus be able to adapt to loads 1 having different heights.
• the positioning means 4 of the cover 3 are configured to move independently of the covering means 5 in the vertical direction.
• the placement means 4 of the cap 3 are configured to apply pressure on the top of the load 1 in order to stabilize the load during the formation of the turns.
• the stabilization of the load 1 can be obtained by means of one or more fingers which limit or even block a movement of the top of the load 1 in one or more horizontal directions by limiting or preventing a horizontal displacement of the top of the load. 1.
• the cap 3 is pressed against the top of the load 1 before starting to cover the side walls with the first series of ascending turns 2.
• the cap 3 is pressed during the establishment of the covering means 5.
• the covering means 5 move from a position of waiting for the load 1 to a position for forming the first. series of ascending turns 2.
• the cover 3 is installed in masked time during the installation of the covering means 5.
• the positioning means 4 of the cover 3 descend towards the top of the load 1 and install the cover 3 while the supply device 1 1 of the plastic film also goes down.
• the cover 3 is deposited while the ring 10 is descending until it reaches the foot of the load 1 to form the first series of ascending turns 2.
• the cap 3 is pressed against the top of the load 1 before the installation of the covering means 5 from a position of waiting for the load 1 to the position of formation of the first series. ascending turns 2. For example, the cap 3 is placed on the top of the load 1 before the ring 10 descends towards the foot of the load 1.
• the cap 3 is on standby and possibly pressed against the top of the load 1 after the covering of the side walls is engaged by the first series of ascending turns 2. In all cases, the cap 3 is ready to be placed and advantageously blocked before the first series of ascending turns 2 reaches the top of the load 1.
• the installation time of the cover 3 is not added to the time it takes to cover the side walls because the two actions are simultaneous.
• the cap 3 is installed by releasing its edges and the second series of ascending turns 6 blocks the cap 3.
• the turns descend to the foot of the load 1 so as to form a sealing joint with the first plastic film.
• the successive descending turns may or may not overlap so as to form a second complete side wall or not.
• the plastic film is configured to reach the top of load 1 and return to the bottom of load 1. The coils stop between the top of load 1 and the bottom of load 1. .
• the plastic film is configured to reach the top of the load 1 and not to return to the bottom of the load 1.
• the plastic film forming the side walls is sealed at the top of the load 1 and advantageously with the cap 3.
• the last turn of the covering is a horizontal turn so as to cover the previous turn with a large area.
• the last turn is welded to the previous turn and the plastic film is cut in order to separate the load and the covering means 5.
• the means of placement 4 of the cap 3 can be formed in different ways.
• a particular embodiment is illustrated in Figure 15 in which the film forming the cap 3 is held in the waiting position by means of one or more clamps 13.
• the cap placement device 4 can be configured to install the cap 3 in the standby position by means of a clamp which pulls one end of the cap 3 from a reservoir to a clamp standby position. , the clamp moving along a rail. Such a configuration makes it possible to form the cap 3 while the means for placing the cap are in motion, which saves time.
• the placement means 4 of the cover 3 comprise a clamp 13 or a first pair of clamps 13 which is configured to pull on the plastic film forming the cover 3 in order to take it from a position storage ( Figures 11 and 12) in the standby position ( Figures 15 and 16).
• the clamp 13 advantageously moves along a rail 14 which is configured to go up at one of its ends in order to bring up an edge of the cover 3 and prevent the cover 3 from being inserted under a turn of the first series. of ascending turns 2.
• the rail 14 can move vertically to pass through the ring 10.
• the clamp 13 comes into contact with one end of the cap 3 to be installed.
• the clamp 13 moves along the rail 14 by pulling on the cover 3 until it reaches the waiting position.
• the clamps 13 are in the standby position, the cap 3 is in the standby position to be installed on the top of a load.
• the cover 3 is fixed to the placement means 4.
• the cap 3 is formed from a reservoir of caps 15 which is shown here as a roll of plastic film, but it is also possible to replace the roll of plastic film with one. reservoir of caps already cut and presented in another form.
• the reservoir 15 is arranged in an upper part of the placing means 8 so that the grippers make a more or less long path so as to draw the necessary length of plastic film.
• the plastic film reservoir 15 forming the cap 3 is arranged inside the generator defined by a device for supplying plastic film intended to form the turns or inside the ring 10.
• the generator is advantageously defined by an axis of rotation of a roll 1 1 of plastic film forming the plastic film reservoir forming the turns.
• the reservoir 15 is then placed inside the imaginary cylinder formed by the roller 11 which supplies the plastic film forming the turns during the multiple revolutions.
• the placement means 4 can pass through the ring. For example, it is possible to lower the placement means to change the tank 15 between two charges.
• a tensioning device 16 is attached to the cover 3 and applies a tension with respect to the clamps. In this way, as the clamps 13 advance along the rail 14, they pull on the cap 3 which is held by the tensioning device 16.
• the tensioning device 16 is arranged to hold the end opposite the clamps 13 when the clamps 13 reach the waiting position.
• the tensioning device 16 can be configured to apply a force on the cap 3 opposing the movement of the clamp 13 so as to tension the cap 3. This embodiment is particularly efficient and compact.
• the tensioning device 16 is formed by one or more rollers which press against a support 17.
• the cap 3 is wedged between the support 17 and the roller or rollers 16.
• the use of a roller 16 is particularly advantageous because this makes it possible not to damage the cap 3.
• the support 17 can also be in the form of a roll.
• the clamps 13 can be moved along the rail 14 in various ways, for example by means of one or more cables, a chain, pneumatically. It is also possible to provide that the clamps 13 are equipped with at least one actuator which allows their movement along the rail 14, for example by means of a motor, a jack or any other equivalent device.
• the clamp 13 When the clamp 13 is in the gripping position, it passes from an open position to a closed position to catch the cap 3 (FIG. 12). The clamp 13 is in the closed position until it reaches the standby position. As illustrated in FIG. 17, the clamp tilts into the open position to release the cover 3, once the first series of ascending turns 2 has been formed and when the covering means 5 do not interfere with the installation of the cover 3.
• the cap reservoir 15 is formed from a roll of plastic film
• the plastic film feed rollers 18 which pull on the film.
• the actuation of the drive rollers 18 can be conditioned by the movement of the clamps 13 so that a movement of the clamps 13 from the storage position to the standby position results in a rotation of the drive rollers 18.
• a movement of the grippers 13 in the other direction does not activate the rollers 18.
• the speed of movement of the grippers 13 is identical to the running speed of the drive rollers 18 for do not stretch the plastic film. It is also possible to use a system for stretching the cover by means of the clamp and possibly rollers
• the wrapper has means 19 for transporting the load 1 in a work zone which is located immediately below the means for placing 4 of the cover 3. In this configuration, the loads 1 move. to come under the placement means 4 of the cover 3 which makes it possible to simplify the operating mechanism of the latter.
• the load 1 is brought from a standby position to a working position.
• Load 1 is moved by means of a displacer.
• the mover is a load displacer 1 by bearings.
• the mover can be formed by a motor which drives the rollers of the transport means 19.
• the mover can be a conveyor.
• the cap 3 is placed in the waiting position in the placement means 4 of the cap 3 while the load 1 moves to arrive just below the placement means 4 of the cap 3.
• the fairing 3 is locked against the top of the load 1 before being installed.
• By blocking the cover 3 before releasing its edges it is possible to better control the final position of the cover 3 relative to the top of the load and to the depth of coverage of the side walls.
• This configuration makes it possible to limit the consumption of plastic film by adapting the dimensions of the cover 3.
• the set of fingers 20 is installed while the placement means 4 press the cap 3 onto the load top 1.
• the set of fingers 20 is configured to press the cover 3 on at least two opposite side faces so as to apply the same stress on two opposite ends of the cover 3.
• the fingers 20 are applied simultaneously on the two opposite faces. load 1 to reduce the risk of the fairing moving 3.
• the fingers 20 are applied to a first pair of opposite side faces of the load 1 and to a second pair of opposite side faces different from the first pair.
• the fingers 20 are applied simultaneously to the two pairs of side faces of the load 1.
• At least two fingers 20 are used to press the cover 3 on a lateral face and to tension the cover 3 in a horizontal direction.
• the central part of the lateral face is covered by a tensioned cap 3, which improves the quality of the covering and the rendering of the covering.
• the fingers 20 are mounted to be able to rotate in a direction perpendicular to the lateral face on which the finger presses the cap 3. In this way, the fingers 20 are able to push the cap 3 towards the side. foot of the load in order to tension the cover 3 vertically. The fingers 20 are also able to stretch the cover 3 horizontally towards the outside of the side walls.
• the fingers 20 are designed to have a depression depth relative to the top of the load which is equal to at least 50%. the height of recovery of the load by the cover 3 on the lateral face considered. For example, if the cap 3 covers the top 20cm of the load, the finger 20 is configured to sink at least 10cm.
• the fingers 20 are designed to have a depression depth relative to the top of the load which is equal to at least 80% of the height of the load being covered by the cap 3.
• the two fingers 20 which press the cap 3 on a side face are spaced at a distance at least equal to 50% of the width of the side face, preferably at least 70%.
• the spacing being less than 100% to keep the fingers 20 in contact with the side wall.
• fingers 20 movable in rotation is presented because this corresponds to an embodiment which is simple to implement and particularly effective, it is possible to replace this rotation of the fingers by a movement in vertical translation and a movement in translation. horizontal.
• the fingers 20 are used after the cap 3 has been placed on the top of the load and detached from the placement means 4.
• the fingers 20 have been installed and the cover 3 is stretched, it is advantageous to produce the second series of ascending turns 2 which makes it possible to block the cover 3 against the load.
• the turns are formed to cover the fingers 20.
• the fingers 20 prevent movement of the cap 3 during the formation of the turns.
• fingers 20 having a longitudinal axis arranged vertically when the cover 3 is stretched over the various lateral faces.
• the fingers 20 protrude from the top of the load so as to allow the fingers 20 to be withdrawn from the top of the load so as not to modify the second series of ascending turns 6. Once the turns are formed, it is advantageous to move the placement means 4 of the cover 3 vertically and upwards.
• the fingers 20 are installed but they do not come into contact with the cover 3 to apply tension to the cover 3.
• the fingers 20 are installed away from the side walls, preferably at a minimum distance of the closest side face between 1 cm and 10cm. During their installation, the fingers 20 can lightly press on the cover 3 to facilitate its shaping around the side walls. This embodiment is advantageous when the plastic film forming the cover 3 is not heavy enough to fall under its own weight and press against the side walls.
• the second series of ascending turns 6 is produced. However, the second series of turns 6 does not come into contact with the cap 3 because it is blocked by the fingers 20. The second series of turns 6 is shaped by the fingers 20.
• the fingers 20 are withdrawn upwards and the turns 6 surrounding the cap 3 press the cap 3 against the side walls as the fingers 20 are withdrawn. It is particularly advantageous to provide for a withdrawal of the fingers. 20 by a vertical and upward movement of the positioning means 4 of the cover 3, which facilitates the formation of a turn which can slightly overlap the top of the load 1.
• the plastic film forming the turns is elastically stretched. It can advantageously be the same for all the turns forming the covering envelope.
• the withdrawal of the fingers 20 is configured to stretch the second series of ascending turns 6 upwards so that when the turns 6 are disconnected with the fingers 20, the second series of turns ascenders 6 will block the fairing 3 and apply a tensile force directed towards the foot of load 1.
• the inventors have observed that the realization of the ascending and / or descending turns causes the generation of air flows which slow down or prevent the descent of the cover 3 under the effect of gravity.
• the device for moving the edges of the cover 3 is activated after release of the cover 3 and before the cover 3 covers the side edges of the load 1 to save time. It is particularly advantageous to use the fingers 20 to press on the cover 3 in order to accelerate its descent and its placement facing the lateral edges of the load.
• the device for moving the edges of the cover 3 may comprise one or more series of nozzles which inject a flow of gas, preferably air in order to force the cover 3 to descend more. quickly to cover the side walls of the load and come into contact with the turns of the first series of ascending turns. It is particularly advantageous to use nozzles to form gas jets because the realization is facilitated compared to the fingers which have to move.
• a series of nozzles or each series of nozzles can define a specific dimension of load 1 and be organized in the form of a ring. It is also possible to provide that a series or each series of nozzles represents a side wall of the load 1.
• a plurality of series, for example four series, are activated in order to lower the fairing 3 more quickly on the four side walls of the load 1.
• the control circuit can be configured to independently control the series of nozzles in order to eject gas on the edge of the load to lower the fairing 3.
• the gas can be injected during the step of covering the edges of the cover by the second series of turns without this hindering the formation of the second series of turns.
• the gas can come from a cylinder containing pressurized gas or from a compressor.
• FIG. 10 represents means 4 for placing the cover 3 which are particularly advantageous for increasing the rate of formation of the protective envelopes.
• Figures 11 to 18 show different configurations of the placement means 4 representative of the consecutive steps of the wrapping process to form a sealed envelope.
• the placement means 4 can also be used to form a sealed envelope only against dust, or even a non-sealed envelope if the turns are non-contiguous.
• the formation of the cap 3 from a plastic film reservoir takes place during the movement of the load for the sake of saving time.
• This configuration of the placement means 4 makes it possible to place the cap 3 more precisely in the various wrapping processes which use a cap 3.
• a waterproof envelope by means of a waterproof cap and in particular of plastic.
• the device and method allow for faster placement of a cap which may also be formed from a flexible material such as a sheet of paper, card stock or material. organic.
• a waterproof envelope it is possible to replace the plastic material cap as well as the film forming the turns by another material, preferably a bio-based material.
• the cap 3 is prepared during the installation of the load 1 in its working position under the placement means 4.
• a new cap 3 is prepared as soon as the previous cap 3 has left the placement means 4.
• the preparation of the cap 3 can start while the second set of ascending turns is in progress, for example by moving the clamps.
• the formation of the cap 3 can be initiated while the wrapping device is still processing the previous load.
• the rotating support cannot turn over when it is too close to the load or too close to the frame, especially if the film intended to form the cover is pulled.
• Figures 19 and 20 illustrate another embodiment of a wrapping device.
• the device is shown without a conveyor.
• the wrapping device defines a working position of the load.
• the working position is the position of the load when the cover 3 is deposited and the series of turns are formed.
• the covering means 5 configured to form series of turns around the side walls of the load 1 by means of a film are identical to those which have been described above.
• the cap placement device 4 3 is configured to hold a cap 3 in a standby position and place the cap 3 on top of the load 1 when the load 1 is in a working position.
• the cover 3 is formed by a first film.
• the first film partially covers at least one side wall of the load 1.
• the cap placement device 4 3 is substantially identical to what has been described above.
• the cap placement device 4 3 differs from that illustrated in the other figures by installing the film reservoir outside the working cylinder defined by the rotation of the covering means around the load and the cap placement device.
• the working cylinder extends vertically.
• the wrapping device is provided with one or more returns 21 which are arranged to circulate the film from a reservoir 15 in the form of a reel to the cap placement device 4 3.
• the returns 21 can be arranged to define a film circulation path which passes through a side face of the frame or through a top wall of the frame. In the illustrated embodiment, the film path passes through the side wall.
• the film extends continuously from the cap placement device 4 3 to the spool.
• the film is always in contact with the cap placement device 4 3 and the spool regardless of the position of the cap placement device 4 3.
• the reference (s) 21 define a portion of film extending vertically or with a vertical component inside the working roll and which connects a reference with the cap placement device 4 3.
• the vertical movements of the Cap placement device 4 3 can be used to form the cap.
• the cap placement device 3 moves down to lay the cap on top of the load 1, it pulls the first film from the spool.
• the cap placement device absorbs the excess film to form the next cap. If the vertical displacement of the cap placement device 4 3 is not sufficient to form the entire length of the cap, the cap placement device 4 3 can pull on the film, for example by means of the pliers described above to form the length of the cap required.
• the film reel may not be associated with a motor.
• the cover is formed at least partially in the cover placement device 4 3 before the load is installed in the working position.
• the cap is formed at least partially during the processing of the previous load. If necessary the rest of the fairing can be formed when the load moves to the working position and / or when the load is in the working position and the first upward turns are forming.
• the reservoir 15 is motorized in order to accept movement of the film between the reel and the cap placement device 4 3 in the two opposite directions. This configuration is advantageous when the loads have a low height which imposes a significant displacement of the device 4 for placing the cap 3 vertically and in particular over a distance greater than the length necessary to form the cap.
• the covering ring substantially defines the section of the working cylinder.
• the second film forming the turns on the side walls is supplied from a reel which circulates along the ring.
• the first film forming the cap passes over the ring and descends towards the cap placement device 4 3 inside the ring so as to allow the formation of a cap when the turns are formed on the ring. the side faces of the load.
• Such a configuration is more advantageous than that proposed in document EP 1 149767 which uses a rotary arm which prevents the formation of the cap as long as the arm is in rotation.
• the cuff placement device holds the cuff formed or being formed and can move vertically by translation.
• the cap placement device can move vertically regardless of the height of the covering means.
• the cap placement device 4 3 is devoid of tilting means about a horizontal axis, which facilitates its construction. It also does not have a clamp moving horizontally to search for the film from a peripheral area to a diametrically opposed area.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Basic Packing Technique (AREA)
• Closures For Containers (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=67956864

Family Applications (1)

Country Status (3)

Family Cites Families (6)

• 2019
  • 2019-02-14 FR FR1901533A patent/FR3092826A1/fr active Pending
• 2020
  • 2020-02-14 EP EP20710225.2A patent/EP3924260A1/de active Pending
  • 2020-02-14 WO PCT/FR2020/050274 patent/WO2020165547A1/fr unknown

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