FR2640934A1 - Device for packaging a hollow product - Google Patents

Abstract

The device for packaging a hollow product, such as pipework 1, under a predetermined gaseous atmosphere, comprises a first device 50 for filling/emptying with a conduit equipped with a valve and with a portion consisting of a first flexible sleeve 52, in order to package under a first predetermined gaseous atmosphere a space outside the hollow product 1 and delimited by a flexible impermeable casing 20 attached to a rigid support 10, 30, and a second device 60 for filling/emptying with a conduit equipped with a valve and with a portion consisting of a second flexible sleeve 62, in order to package under a second predetermined gaseous atmosphere the inside of the hollow product 1. Each filling/emptying device 50, 60 mounted on the rigid support 10, 30 is 130 incorporated in the one same supply head 10 and is extended, on the inside of the impermeable casing 20, by a tube 53, 63 and, on the outside of the supply head 10, by a coupling piece 51, 61. A sealing clip 90 is arranged in the supply head 10 to squash each of the sleeves 52, 62 and to provide additional sealing. The coupling pieces 51, 61 are suitable for being coupled up in a sealed fashion to a removable outside device 100 for connecting up to sources of pressurised gas or to vacuum-creating installations.

Description

 Device for packaging a hollow product.

 The present invention relates to a device for packaging a hollow product, such as a pipe, under a predetermined gaseous atmosphere, comprising a rigid support to which is attached at least one flexible element to define a sealed envelope, at least one closable opening being formed ê through the rigid support to inject a gas or create a vacuum inside the sealed envelope.

 Various types of packaging are already known comprising a flexible envelope which may contain a product, which is fixed by a support for example by welding or gluing and has at least one orifice provided with a valve through which a vacuum is produced or put under pressure or under special gas such as an inert gas.

 The various known packaging devices are not, however, specifically adapted to hollow products and do not guarantee that all the surfaces of a product to be protected are in contact with the predetermined gaseous atmosphere # introduced inside the packaging. In addition, the sealing of known packaging devices is not always reliable or no means is provided to guarantee that during storage there have been no modifications, voluntary or involuntary, of the atmosphere. predetermined gaseous.

 The present invention aims to provide a reusable packaging device capable of providing a high level of tightness and reliability, the packaging obtained being able to have a high level of quality in terms of cleanliness, protection against shocks, protection against vibrations, protection of product surfaces, conservation of humidity, protection against corrosion and protection against malicious acts.

 The object of the invention is still more precisely to produce a packaging device suitable for hollow products, such as pipes, and capable of bringing each internal or external surface of the product into contact with a predetermined gaseous atmosphere adapted to this surface.

 These aims are achieved by means of a device for packaging a hollow product, such as a pipe, under a predetermined gas atmosphere, comprising a rigid support to which is attached at least one flexible element to define a sealed envelope, at least one opening. closable being formed through the rigid support for injecting a gas or creating a vacuum inside the sealed envelope, characterized in that it comprises a first filling-emptying device with a first conduit provided with a first valve and of a section constituted by a first flexible sleeve, for conditioning under a first predetermined gaseous atmosphere a space outside the hollow product and delimited by said sealed envelope and a second filling-emptying device with a second conduit provided with a second valve and a section constituted by a second flexible sleeve, for conditioning under a second predetermined gas atmosphere e inside the hollow product, in that each filling-emptying device mounted on the rigid support is incorporated in the same supply head, and extends inside said sealed envelope by a tube and to the outside of the feed head by an end piece, in that a sealing clamp is arranged in the feed head to ensure that each of said sleeves is crushed and to provide additional sealing and in that the end pieces are suitable for connect tightly to a removable external device for connection to pressurized gas sources or vacuum installations.

 According to a particular embodiment, the rigid support comprises a rigid frame or a cage integral with the supply head and the flexible element consists of a first plastic envelope in the form of a bag which surrounds the frame or the cage and is tightly attached to the feed head to form with the latter said sealed envelope.

 In this case, the hollow product can be connected to the tubing of the second filling-emptying device by a tight sleeve and each of the other openings of the hollow product is provided with an individual plug-shaped shutter provided with a thin deformable wall. in order to isolate the second predetermined gas atmosphere inside the hollow product from the first predetermined gas atmosphere in a space outside the hollow product, while allowing visual control of the state of said second gas atmosphere by said thin deformable wall .

 According to another possible embodiment, the hollow product is placed in a second internal plastic envelope in the form of a bag which is tightly attached to a surface of the supply head which surrounds the tubing of the second filling device. emptying in order to isolate the second predetermined gas atmosphere prevailing inside the second envelope and penetrating inside the hollow body, from the first predetermined gas atmosphere prevailing in the space located between the second internal envelope and the envelope waterproof exterior.

 In this case, each bag-shaped plastic envelope can be fixed to the feed head using a slight initial tightening of the bag, supplemented by strapping using a collar on an area. corrugated profile ring.

 According to an advantageous characteristic of the device according to the invention, each valve of the first and second filling-emptying devices comprises two valves in series, with a first seat, a first ball cooperating with the first seat and with a first return spring, a second seat, a second ball secured to the first ball by a connecting rod and cooperating with the second seat and the second return spring, and sealing means arranged around each seat.

 However, according to a possible alternative, each valve of the first and second filling-emptying devices comprises a toroidal metal seat and a stamped stainless steel valve.

 In order to ensure that the conditioning device is not subject to unauthorized modifications to the predetermined gas atmosphere, the device may include means for securing seals between the sealing clamp and the supply head when the sealing clamp sealing is in the closed position of crushing of the sleeves.

 According to a particular characteristic, the feed head is extended by an upper end in the form of a hanger facilitating storage and handling operations.

 In this case, a damping device can be interposed between the feed head and the upper end in the form of a hanger.

 The first bag-like plastic envelope may be partially opaque so as to protect against light while allowing the state of the internal packaging to be checked.

 The removable external device for connection to sources of pressurized gas or vacuum installations comprises a main body, provided with a handle, to which flexible pipes for connection to said sources of pressurized gas or installations for connection are connected. empty, and which comprises means for fitting onto said end pieces provided with sealing members and locking members.

 According to another particular embodiment of the packaging device according to the invention, the rigid support comprises a rigid container in the form of a chest provided with a door and at the upper part of which is incorporated the feed head, and the element flexible comprises at least # two plastic elements arranged in openings in the trunk to constitute visualization indicators of the pressure inside the trunk as well as inside the hollow body connected to said second filling device- emptying.

 In this case, the content can be equipped with a removable tray on which the hollow product is fixed or inflated bladders can be placed around the hollow body inside the container to immobilize the hollow body.

Other characteristics and advantages of the invention will emerge from the following description of particular embodiments of the invention, with reference to the accompanying drawings, in which
FIG. 1 is a perspective view of a packaging device according to a first embodiment of the invention,
FIG. 2 shows in perspective two conditioning devices similar to that of FIG. 1, suspended on a carriage,
FIG. 3 is a sectional view showing a removable internal device for supplying gas or placing under vacuum, ready to fit onto a supply head forming part of the packaging device according to the invention,
FIG. 4 is a view similar to that of FIG. 3, but in which the removable external device is fitted onto the supply head,
FIG. 5 is a detailed front view showing a sealing clamp cooperating with a double sleeve incorporated in the supply head of the packaging device according to the invention,
FIGS. 6 and 7 are sectional views along lines VI-VI and Vil-Vil of FIG. 5,
FIG. 8 is a detailed view in section showing a means of connecting a pipe to be packaged to the supply head and of connecting a sealed plastic bag outside to the same supply head,
- Figures 9 and 10 are sections through the individual shutters of a pipe to be packaged according to a particular embodiment of the invention, respectively for conditioning the interior of the pressure piping and conditioning the inside the vacuum piping,
FIG. 11 is a schematic sectional view of a device for packaging a hollow product according to a second embodiment of the invention, with a double plastic envelope,
FIG. 12 is a perspective view similar to that of FIG. 1, but showing a particular form of flexible envelope,
FIGS. 13 and 14 are perspective views showing packaging devices comprising a rigid cage-shaped structure,
FIG. 15 is a detail view showing in section a special form of valve,
FIG. 16 is a perspective view of a third embodiment of the invention with a rigid structure in the form of a box provided with pressurization indicators with flexible walls, and
- Figure 17 is a top view of the packaging device of Figure 16.

 Figure 1 shows schematically in perspective a device for packaging a hollow product such as piping 1, according to a first embodiment according to the invention.

 The conditioning device essentially comprises a rigid structure composed of a head casing 10 for gas supply and a rigid frame 30 comprising uprights 31 to which the piping 1 is fixed using flexible folding straps 32. An outer envelope 20 of flexible plastic material has the form of a bag enveloping the rigid frame 30 and the product 1 to be protected, and is attached by its opening to the supply head 10. The fixing of the flexible envelope 20 on the head 10 can be produced by welding, gluing, compression or strapping using a collar 21.

 The supply head 10 essentially comprises first and second filling-emptying devices 50, 60, each device 50, 60 comprising a nozzle 51, 61 adapted to be connected in leaktight manner to a removable external device 100 for connection to a source of pressurized gas or to a vacuum installation, provided with two flexible gas inlet pipes 101, 102 which are connected respectively with the nozzles 51, 61 when the external device 100 provided with a handle 122 is connected to the supply head 10. Each filling-emptying device 50, 60 further comprises a valve, not visible in FIGS. 1 and 2, an additional sealing element 52, 62 constituted by a flexible sleeve cooperating with a sealing clamp 90, and a tube 53, 63 opening into the interior of the sealed envelope 20.

 In the embodiment of Figures 1 and 2, the tubing 63 of the second filling-emptying device 60 is connected by a flexible tight sleeve 33 to one end of the tubing 1 to be conditioned, while the other openings of the tubing are provided sealing means 70 constituted by individual plugs 71 provided with a thin deformable wall as will be described with reference to FIGS. 9 and 10.

 The tubing 53 of the first filling-emptying device 50 opens directly inside the sealed envelope 20, but outside the tubing 1. The presence of a double filling-emptying device 50, 60 thus makes it possible to condition independently both the inside and the outside of the hollow product 1 to be protected such as a piping element, the internal and external packaging of the product 1 possibly being different. It is thus possible, for example, to create a vacuum inside the pipe 1 and to have a slight overpressure or an inert gas inside the envelope 20 around the pipe 1.

In order to facilitate storage and handling operations, the feed head 10 is advantageously extended at its upper part by a part 40 in the form of a hanger with a hook 41 allowing installation on a bar 121 of suspension which can be mounted by example on a cart
120 (Fig 2). Holes 42 in the hangers 40 make it possible to connect
between them the products of the same batch.

Protection against vibration can be improved
by the integration of shock absorbers between the head housing
supply 10 and the upper part 40 for hooking forming
hanger.

A pocket 80 containing accompanying documents
of the conditioned product can be fixed on the rigid casing of the
feed head 10. -
Figures 1 and 2 show a rigid frame 31
fitted with flexible folding straps to hold the product 1
during handling and storage. However, other types of
rigid structures 30, such as cages 31 can be
used according to the form of the product to be packaged. In this case
cage 31 is always attached to a head 10 supplying
gaseous fluids, itself preferably surmounted by a part in
hanger shape (Fig 13 and 14). Likewise, the shape of the envelope
waterproof bag-shaped 20 may have special shapes
adapted to the configuration of the product to be packaged (Fig 12).

In Figure 2, there is shown by way of example a
part 1 vacuum packed, with a plated envelope 20
against product 1 (packaging device shown in
right in Figure 2) and a second part 1 packaged under
pressure, with an inflated envelope 20 (conditioning device shown on the left in FIG. 2).

The external appearance of the external waterproof envelope 20
thus makes it possible to verify the integrity of the packaging as regards
concerns the gas atmosphere external to the product 1. The choice of a
partially opaque outer casing 20 protects the
produces 1 with respect to light while leaving the possibility
observe the individual shutter 71 devices
various openings of the pipes 1 not attached to the tubing
63. This also makes it possible to monitor the integrity of the
conditioning with regard to the internal gas atmosphere at
product 1, taking into account the particular shape of the plugs 71, as shown in Figures 9 and 10.

 Each stopper 71 for closing an opening of the hollow product 1 is made of an elastic material and comprises a bulged part 72 of toric shape intended to come to engage behind a conical end similar to the end 1a of FIG. 8 delimiting an opening of the piping 1. The bulged part 72 is extended by a part 73 in the form of a portion of a sphere, the thickness of which decreases from the bulged part 72.

Part 74 of the sphere portion has a reduced thickness such that, depending on the internal pressure prevailing in the pipes 1, this very thinned part 74 has a shape that is convex towards the outside when it is an internal packaging. under pressure (Fig 9) and a concave shape towards the outside when it is an internal vacuum packaging (Fig 10).

 The individual shutters 71, like the sleeves 33 for connection between the hollow product 1 to be conditioned and the tube 63 for supplying gaseous fluid to the interior of the hollow product 1 can be made of silicone elastomers.

 The casing of the feed head 10 can itself be made of a thermoplastic fluorinated resin of the type known under the name Teflon and which can consist of the following products: KEL-F, PCTFE, FEP.

 The flexible envelope 20 in the form of a bag can be made, for example, of polyethylene or polypropylene.

 As already indicated, the waterproof envelope 20 can be attached to the supply head 10 by welding, bonding or compression. However, according to a preferred embodiment shown in Figure 8, the attachment of the bag 20 on the housing of the feed head 1 is obtained using a slight initial tightening of the bag, supplemented by a strapping on an annular zone 22 with a wavy profile. This strapping is obtained using a rubber collar 21 or a conventional metal collar provided with a clamping screw.

 A more particular description will now be given with reference to FIGS. 3 and 4 of the cooperation between a removable external device 100 for connection to sources of pressurized gas or vacuum installations, and the nozzles 51, 61 of the first and second devices. filling-emptying 50, 60.

 The removable external device 100 comprises a body 110 surmounted by a handle 122 and comes to fit simultaneously on the two end pieces 51, 61 (Fig 1) to communicate respectively the flexible conduits 101, 102 connected to the removable external device 100 with the internal conduits of the first and second ends 51, 61.

 The removable external device 100 comprises two legs 111, 112 which engage on either side of the heads 153 of the nozzles 51, 61 to come into abutment in grooves 151, 152 formed on a front face of the body 150 of the head supply 10 supporting the ends 51, 61. The body 110 of the removable external device 100 comprises in the free space located between the two legs 111, 112 two revolution heads 115 intended to come to engage in the cavities 154 in profile adapted located at the ends of the ends 51, 61.

 Insofar as the end pieces 51 and 61 are identical, as well as the associated organs for supplying fluid through the removable external device 100, we will only describe with reference to FIGS. 3 and 4 that the end piece 51 intended to receive gaseous fluid from the flexible conduit 101, or to allow the evacuation of gaseous fluid towards said flexible conduit 101, depending on the type of installation to which this conduit 101 is connected.

 The end piece 51 comprises a projecting part 153, the external faces of which cooperate with the internal faces of the legs 111, 112 of the removable external device 100 and carry grooves 155 into which can be locked locking balls 118 urged by springs 119 placed in housings formed in the internal faces of the legs 111, 112 in a plane perpendicular to the end of the gas passage conduit 113 opening through the head 115. The end of the projecting part 153 of the nozzle 51 defines a cavity of revolution 154 with frustoconical portions intended to receive a head 155 and to come to bear by its external rim against a seal 114 arranged around the head 115 between the legs 111, 112 of the removable external device 100.

 The end of the conduit 113 for gas passage through the body 110 of the removable external device 100 projects from the head 115 to form a nozzle 116 provided with lateral orifices 117 for gas passage. The nozzle 116 is intended to engage in a passage formed in the seat 131 of a first valve 130 comprising a ball 132 cooperating with a return spring 133.

A second valve 140 is placed in series with the first valve 130 in a conduit 157 opening at the end 154 of the end piece 51. The second valve 140 comprises a seat 141 and a ball 142 made integral with the ball 132 by a rod 156 placed axially in the duct 157. The ball 142 cooperates with a return spring 143 as in the case of the first valve. O-rings 134, 144 are placed on the seats 131, 141 of the first and second valves 130, 140 respectively.

 The presence for each end piece 51, 61 of a double valve 130, 140 with two balls 132, 142 secured by a spacer 156 makes it possible to increase the security of the seal after removal of the removable external device 100 using which predetermined gas atmospheres have been created through the nozzles 51, 61 in the packaging device. When the removable external device 100 is engaged on the end pieces 51, 61 (FIG. 4) the second ball 142 is detached from its seat automatically by means of the spacer rod 156.

 Although double valves 130, 140 with two balls 132, 142 constitute a preferred embodiment, other embodiments are possible. Thus, in Figure 15, there is shown a simple valve 230 intended to be mounted in a conduit 157 and comprising a metal toric seat 231, without plastic or elastomer, and a valve 232 in stamped stainless steel.

 FIGS. 5 to 7 and 11 show a device which contributes to increasing the tightness of the packaging device in a controlled atmosphere and which also provides protection against untimely modifications of the gaseous atmospheres.

 For the sake of clarity, FIG. 6 does not show the valve 130, 140 with double ball incorporated in each end piece 51, 61, and in FIGS. 5 and 7, the body 150 is not shown part of the feed head 10.

 As shown in FIGS. 6 and 11, each conduit 157 of the nozzles 51, 61 containing a valve 130, 140 is extended by a conduit 158 of larger cross section inside which is mounted a sleeve 160 which makes it possible to constitute for each device 50, 60 for filling and emptying a second sealing level. After establishment of the desired gas atmospheres inside the hollow body 1 by the filling-emptying device 60 and outside the hollow body 1 by the filling-emptying device 50, a sealing clamp 90 articulated by a hinge 91 on the feed head 10 is folded down and locked by a stop device 93 to crush a central part 161 of each of the two sleeves 160 arranged in the conduits 158. The clamp 90 comprises a fixed jaw 92 and an articulated jaw 97 provided with teeth 96, 95 in order to increase the effectiveness of the sealing by crushing of the parts 161 of the sleeves 160 which may be made of rubber, for example of elastomers.

 The use of seals 94 between the sealing clamp 90 which crushes the sleeves 160, and the casing of the supply head 10 makes it possible to guarantee the good condition of the packaging on the one hand due to the improvement of the sealing of the filling-emptying systems 50, 60, on the other hand by prohibiting inadvertent voluntary or involuntary reconditioning, no reconditioning being possible without breaking the seals.

 Furthermore, the existence of the waterproof barrier constituted by the clamp 90 allows very good resistance to pressure over time while allowing possible repackaging without destroying the prior packaging.

 FIG. 11 also shows an alternative embodiment in which a hollow part such as a pipe 1 is not directly connected by a sleeve to a gas supply pipe 63 and provided with individual shutters as in the embodiments embodiment of FIGS. 1 and 2, but a second sealed envelope 170 in the form of a bag, internal to the outer envelope 20, and completely covering the packaged product 1 is fixed in a sealed manner to a second bearing 11 of the casing of the head supply 10, in an area surrounding the gas supply pipe 63.

 The flexible and waterproof internal envelope 170 can be made of the same materials as the external envelope 20 and can be attached to part 11 of the casing of the supply device 10 for example by a collar 171 provided with teeth and tightening the end of the envelope 170 against a bearing 172 integral with the part 11 and also provided with teeth, in a similar manner to the attachment already described for the external envelope 20.

 In the embodiment of FIG. 11, the predetermined gas atmosphere prevailing inside the internal envelope 170 and penetrating inside the hollow body 1 is isolated from the gas atmosphere prevailing in the space located between envelopes 170 and 20.

 Here again, the inflated or deflated appearance of each of the bags 20, 170 indicates a possible modification of the gaseous packaging and serves as a pressurization indicator.

 Figures 16 and 17 show a particular embodiment of the invention in which the rigid structure 230 is constituted by a rigid container in the form of a trunk 231 provided with a door 232 and at the top of which is incorporated the head power supply 10 which can be quite similar to the head 10 already described with reference to the other embodiments.

 The trunk 231 can be provided with handles 235 and with hooks for closing 233. A removable tray 234 makes it possible to fix a hollow object in the traditional way on the tray then to introduce it without contact with the walls of the trunk. However, inflated bladders can also be used to hold the hollow object inside the trunk 231.

 The walls of the trunk 231 are pierced with at least two windows closed by flexible elements 126 made of plastic material which play the role of pressurization indicators allowing, like the envelopes 20, 170 of FIG. 11 or the envelope 20 and the plugs 70 Figures 1 and 2, to visualize, by the inflation or deflation of these flexible elements 126, the pressure on the one hand inside the hollow body l by connection with the conduit 159 connected to the device 60 of filling ssage-emptying opening through the end piece 61 out of the trunk 231, and on the other hand inside the hollow body 1 by connection with the conduit 159 connected to the filling-emptying device 50 opening through the end piece 51 out of the trunk 231.

Claims (15)

1. Device for packaging a hollow product, such as a pipe (1), under a predetermined gas atmosphere, comprising a rigid support (10, 30; 10, 230) to which is attached at least one flexible element (20; 126) to define a sealed envelope, at least one closable opening (51, 61) being formed through the rigid support for injecting a gas or creating a vacuum inside the sealed envelope, characterized in that it comprises a first filling-emptying device (50) with a first conduit (157, 159) provided with a first valve (130, 140; 230) and a section constituted by a first flexible sleeve (160), for packaging under a first gaseous atmosphere predetermined a space external to the hollow product (1) and delimited by said sealed envelope and a second filling-emptying device (60) with a second conduit (157, 159) provided with a second valve (130, 140 ) and a section consisting of a second sou sleeve ple (160), to condition the interior of the hollow product (1) under a second predetermined gas atmosphere, in that each filling-emptying device (50, 60) mounted on the rigid support (10, 30; 10, 130) is incorporated in the same feed head (10), and extends inside said sealed envelope by a tube (53, 63) and outside of the feed head (10 ) by a nozzle (51, 61), in that a sealing clamp (90) is disposed in the supply head (10) to ensure a crushing (161) of each of said sleeves (160) and provide a additional skin and in that the end pieces (51, 61) are adapted for sealingly connection to a removable external device (100) for connection to sources of pressurized gas or vacuum installations. 2. Device according to claim 1, characterized in that the rigid support (30, 10) comprises a rigid frame or a cage (31) integral with the supply head (10) and in that the flexible element (20 ) is constituted by a first plastic envelope in the form of a bag which surrounds the frame or the cage (31) and is tightly attached to the supply head (10) to form said waterproof envelope with the latter. 3. Device according to claim 1 or claim 2, characterized in that the hollow product (1) is connected to the tube (63) of the second device (60) for filling-emptying by a sealed sleeve (33) and in that that each of the other openings of the hollow product (1) is provided with an individual plug-shaped shutter (-71) provided with a thin deformable wall (74) in order to isolate the second predetermined gaseous atmosphere inside the hollow product (1) of the first predetermined gas atmosphere in the space outside the hollow product (1), while allowing visual control of the state of said second gas atmosphere by said thin deformable wall (74). 4. Device according to claim 1 or claim 2, characterized in that the hollow product (1) is placed in a second internal envelope (170) of plastic material in the form of a bag which is tightly attached to a surface (11 ) of the supply head (10) which surrounds the tubing (63) of the second filling-emptying device (60) in order to isolate the second predetermined gaseous atmosphere prevailing inside the second envelope (170) and penetrating inside the hollow body (1), the first predetermined gaseous atmosphere prevailing in the space located between the second internal envelope (170) and the sealed external envelope (20). 5. Device according to any one of claims 2 and 4, characterized in that each plastic bag-shaped envelope (20, 170) is fixed to the supply head (10) using a slight initial tightening of the bag, supplemented by a strapping using a collar (21, 171) on an annular zone with a wavy profile (22, 172). 6. Device according to any one of claims 1 to 5, characterized in that each valve (130, 140) of the first and second filling-emptying devices (50, 60) comprises two valves in series (130, 140) with a first seat (31), a first ball (132) cooperating with the first seat (131) and with a first return spring (133), a second seat (141), a second ball (142) integral with the first ball (132) by a connecting rod (156) and cooperating with the second seat (14i) and the second return spring (143), and sealing means (134, 144) arranged around each seat (131, 141 ). 7. Device according to any one of claims 1 to 5, characterized in that each valve (230) of the first and second filling-emptying devices (50, 60) comprises a toroidal metal seat (231) and a steel valve stamped stainless steel (232). 8. Device according to any one of claims 1 to 7, characterized in that it comprises means (94) for fixing seals between the sealing clamp (90) and the supply head (10) when the sealing clamp (90) is in the closed position for crushing the sleeves (160). 9. Device according to any one of claims 1 to 8, characterized in that the feed head (10) is extended by an upper end (40) in the form of a hanger facilitating storage and handling operations. 10. Device according to claim 9, characterized in that a damping device is interposed between the feed head (10) and the upper end (40) in the form of a hanger. 11. Device according to claim 2, characterized in that the first envelope (20) of plastic in the form of a bag is partially opaque so as to provide protection against light while allowing the state of the internal packaging to be checked. 12. Device according to any one of claims 1 to 11, characterized in that the removable external device (100) for connection to sources of pressurized gas or vacuum installations comprises a main body (110), provided a handle (122), to which are connected flexible pipes (101, 102) for connection to said sources of pressurized gas or vacuum installations, and which comprises means (111, 112) for fitting onto said ends (51, 61) provided with sealing members (114) and locking members (118, 119). 13. Device according to claim 1, characterized in that the rigid support (230, 10) comprises a rigid container in the form of a chest provided with a door (232) and at the upper part of which is incorporated the feed head ( 10), and in that the flexible element comprises at least two plastic elements (126) arranged in openings in the trunk (230) to constitute indicators for visualizing the pressure inside the trunk as well as 'inside the hollow body (1) connected to said second filling-emptying device (60).  14. Device according to claim 13, characterized in that the container (23C) is equipped with # a removable tray (234) on which the hollow product is fixed. 15. Device according to claim 13, characterized in that inflated bladders are placed around the hollow body (1) inside the container (230) to immobilize said hollow body (1).