EP1215121A1 - Device for packaging quantities of liquid into sealed bags and use thereof - Google Patents

Abstract

The installation comprises a vertical frame, means for moving a sleeve (G) from which the sachet is made, a liquid supply pipe (41) and sleeve opening welding means. There are welding means for connecting opposite ends of the sleeve under the pipe and cutting means. A first welding and cutting station (3) is located either side the pipe and a second welding and cutting station is located under the pipe end.

Description

The present invention relates to an installation to condition doses of liquid in sachets waterproof made from a sheath of flexible material thermosealable, open longitudinally, comprising a vertical frame comprising means for scrolling this sheath from top to bottom, a supply rod for said liquid penetrating into said sheath through said longitudinal opening, means for welding said longitudinal opening below the passage of said filling rod through said longitudinal opening, means for transverse welding to connect the longitudinal edges opposite of said sheath below the dispensing end said feed rod and cutting means to separate the sachets containing said doses, as well than using this facility.

A bag of this type, further comprising a valve adjacent to a pocket containing a straw, one end of which is engaged in the inlet of the valve, its method of manufacturing and packaging are described in EP-0 948 446. As regards the actual packaging says this document gives relatively few details however and does not disclose the means used for this purpose. He ... not discloses no solution for packaging in continued. As described, the shape of the sachets is given by the edges of the strip material and by transverse welds, connecting the two longitudinal edges of the material in strip, giving a quadrilateral profile to the bag.

The continuous vertical packaging process of pouches of berlingots or parallelepiped bricks from continuous tubular material is well known. However, vertical packaging facilities used for this purpose only allow volumes with quadrangular profile or volumes with surfaces regulated, dictated by the tubular shape of the sheath which they came from, leaving little or no room to the fantasy and not allowing to confer a character original, even playful to the sachets thus produced. Moreover a given installation can only produce sachets of identical shapes and dimensions. Only the decor and / or the inscriptions on the outer surface of the bag allow to personalize the sachet according to the product it contains and / or the manufacturer's brand of the product packaged in this sachet.

The main object of the present invention is to allow to condition the liquid continuously, advantageously, but not exclusively, in blank sachets such as described in the aforementioned document and to form sachets likely to have various shapes and easily modifiable according to needs or form we want to give the bag with a minimum of work.

To this end, the present invention has first of all for object an installation to condition doses of liquid in waterproof bags made from a sheath a flexible heat-sealable material according to claim 1. It then relates to a use of this installation according to claim 10.

One of the advantages of this installation is to give the essentially sachet of the shape of its periphery before filling, not leaving between the two welded parts of on either side of the filling rod that a passage for this cane, so the liquid is practically already confined to the periphery of the sachet. This welding giving most of the shape of the bag is accompanied by cutting to separate the welded portions of the sheath in which the bag is formed. With this design, it becomes possible to vary the shape of the periphery given to the sachet, since it is no longer dictated by the straight edges of the tubular sheath.

So just change the welding tools and cutting to change the profile given to the bag. The association of a given profile with an impression appropriate to the profile allows to give particular aspects to the bag. This is how, for example, the profile can recall that of a fruit, the impression of the sachet then reproducing that of the skin of the fruit. Such a sachet can then be used to condition the juice of the fruit whose reproduced sachet appearance. This aspect is obviously not limited to the example above; he can take that of imaginary characters or real, caricatures, objects recalling demonstrations sports, animals etc. The profile given to sachet can also be chosen to evoke a theme used as part of an advertising campaign.

Advantageously, in the case where the packaging installation is used for filling sachets whose blanks are produced according to the above-mentioned EP-0 948 446, relative installation workstations to the packaging of the liquid itself are preceded by a post intended to open the bottom of a pocket adjacent to the valve channel and placement a straw in this channel and in the adjacent pocket.

La figure 1 est une vue en élévation de cette forme d'exécution;

la figure 2 est une vue partielle agrandie de la figure 1, illustrant le premier poste de soudage et de coupe;

la figure 3 est une vue selon III-III de la figure 2, outil de soudage et de coupe enlevé;

la figure 4 est une vue partielle de l'outil de soudage et de coupe seul vu selon IV-IV de la figure 2;

la figure 5 est une vue selon V-V de la figure 1 illustrant le second poste de soudage et de coupe;

la figure 6 est une vue en perspective des outils de soudage et de coupe seuls destinés à être associés au second poste de soudage et de coupe de la figure 5;

la figure 7 est une vue partielle agrandie de la figure 1;

la figure 8 est une vue en coupe selon VIII-VIII de la figure 7;

la figure 9 est une vue partielle agrandie d'un détail de la figure 8;

la figure 10 est un schéma de la suite des opérations du premier poste de soudage et de coupe ;

la figure 11 est un schéma de la suite des opérations du second poste de soudage et de coupe.

Other features and advantages of the present invention will become apparent on reading the following description made in connection with the appended drawings showing, schematically and by way of example, a particular embodiment of the installation which is the subject of the present invention and its use.

Figure 1 is an elevational view of this embodiment;

Figure 2 is an enlarged partial view of Figure 1, illustrating the first welding and cutting station;

Figure 3 is a view along III-III of Figure 2, welding and cutting tool removed;

Figure 4 is a partial view of the welding and cutting tool alone seen along IV-IV of Figure 2;

Figure 5 is a view along VV of Figure 1 illustrating the second welding and cutting station;

FIG. 6 is a perspective view of the welding and cutting tools alone intended to be associated with the second welding and cutting station of FIG. 5;

Figure 7 is an enlarged partial view of Figure 1;

Figure 8 is a sectional view along VIII-VIII of Figure 7;

Figure 9 is an enlarged partial view of a detail of Figure 8;

FIG. 10 is a diagram of the sequence of operations of the first welding and cutting station;

Figure 11 is a diagram of the following operations of the second welding and cutting station.

The installation illustrated in Figure 1 includes a frame B comprising two parts side by side B1 and B2. The part B1 is intended for the formation of straws P and their feeding in sachets, including blanks, in this example, are previously formed in a strip material in the form of a flattened sheath G. This sheath G is stored as a coil (not shown) and is brought to part B2 of frame B by a roller 1, disposed at top of this part B2 which is more particularly the object of the present invention.

This sheath G is open longitudinally along its left edge with reference to Figure 1. In this example, going down, this duct G goes through a post of loading of straw 2. This one is obviously necessary only if P straws are to be loaded into the bags formed in the sheath G and more particularly when these bags are fitted with valves. Sheath G then passes through a first welding and cutting station 3 and by a second welding and cutting station 4.

The first welding and cutting station 3 is shown in more detail in Figures 2 to 4 and includes a support frame 5 connected to the frame B2 by two slides 6 mounted on two vertical slides 7 secured to each of their ends of two fixing plates 8 parallel, fixed to frame B2 by bolts 9. Nuts clamps 10 serve to fix the slides 6 on the vertical slides 7. A VR adjustment wheel is secured to a shaft 70 whose end is engaged with a screw jack 71 intended to move the frame vertically support 5 on the vertical slides 7. This setting is intended to adapt the position of the welding station and cutting according to the size of the sachets in which the liquid is conditioned.

Two tool supports 11 and 12 are slidably mounted each on two slides 13, respectively 14 fixed to two parallel sides of the support frame 5. Each of these supports 11, 12 is connected to a jack 15, respectively 16, to slide these supports on the slides 13, 14. Each tool support 11, 12 comprises two tool holders 17, 18, respectively 19, 20. Each tool holder 17-20 has a fixing pin 21, 22, 23, respectively 24 of which each crosses supports 25, 26, 27, respectively 28, in the form of pairs of parallel plates, pierced with coaxial openings. At one of their ends, the fixing pins 21-24 end with heads 21a, 22a, 23a, respectively 24a, while keys 21b, 22b, 23b, respectively 24b retain them at their other ends.

The two tool holders 17, 18, respectively 19, 20 of the tool supports 11, 12 are each slidably mounted on two slides 29a, 29b respectively 30a, 30b. Nuts fin 17a, 18a, 17b, 18b, 19a, respectively 20a, two other nuts, symmetrical to the last two 19a, 20a not being visible, serve to tighten the tool holders 17-20 behind the scenes 29a, 29b, 30a, 30b. Two joysticks adjustment 31, 32 (FIG. 2) are integral with axes, one of which threaded part is engaged with a nut (not shown), secured to each of the supports 17, respectively 18. These adjustment levers 31, 32 are used to move the supports relative to the slides 29a, 29b.

Figures 2 and 4 show in more detail three of the four tools, the fourth not being visible, 33, 34 and 35 mounted on the four tool holders 17-20. Each tool 33-35 has on its rear side a fixing block, of which only two 36, 37 are visible in FIG. 4. Each block is crossed by a bore 36a, 37a, intended for passage a fixing pin 21, respectively 23, both other bores are not visible.

Each tool 33, 34 has, in its upper part, a welding electrode 38, 39 which can be seen in lines interrupted in Figure 2. The flat surfaces of the tool 35 and the invisible tool facing the tool 34, are located opposite the electrodes 38, respectively 39 and constitute counter-electrodes. The welds formed by the two electrodes 38, 39 define the entire periphery of the bag with the exception of a vertical passage 40 (Figure 2) formed between the tools 33, 34 on the one hand and between the tool 35 and the invisible tool located opposite the tool 34 (figure 2). The vertical passage 40 is intended to leave pass a liquid supply rod 41 (Figure 1).

The lower parts of the two tools 33, 34 (Figures 2 and 4) each have a movable knife 42, 43 actuated by a jack 44, 45. These movable knives 42, 43 have a shape corresponding to the outer edge of the welding electrodes 38, 39. The two tools, of which only tool 35 is visible, have opposite each movable knife 42, 43 a receiving groove, of which only the groove 46 is visible in FIG. 4, of a shape corresponding to that of the knife mobile 42.

The actuation mechanism of the second welding station and cutting 4 is illustrated in more detail by the figure 5, while the tools intended to be associated with this mechanism actuation are illustrated in Figure 6. The assembly of this actuation mechanism is carried by a horizontal rectangular frame 47, integral with two vertical slides 48, 49, each engaged with a motor linear 50, 51, each of which is fixed to the frame B2 (Figure 1) by fixing angles 52.

The two short sides of the rectangular frame 47 each carry a jack 53, 54, each of them being engaged with a slide 55, respectively 56, mounted on the chassis through guide rails (not shown) running along the two sides 47a, 47b of the chassis 47. The slide 55 carries a slide 57 which can be moved perpendicularly to the slide 55 by M1 drive motors, M2, that is to say transversely to chassis 47. The slide 56 also carries a slide 58 also movable transversely to the chassis, by M3 drive motors, M4.

Each slide 57, 58 carries two tool holders 59, 60, respectively 61, 62, each secured to a jack 63, 64, respectively 65, 66. A free roller 67, arranged transversely to the center of the chassis 47 is intended to receive the bottom of the sheath G.

Tools intended to be mounted on the second station welding and cutting 4 are illustrated in perspective by Figure 6. These tools include a welding electrode 68 located opposite a counter electrode 69, these two organs 68, 69 being fixed to the supports 60, 62 by fixing parts 100. Advantageously the counter-electrode 69 is associated with cooling means. Both other supports 59, 61 carry the cutting members 72, 73. While the member 73 is a counter-cutting member fixed connected to the support 59 by fastening parts 100, the cutting member 72 is formed by a sliding mounted block on fixing rods 101 and pressed towards the counter-cutting member 73 by return springs 102. This assembly allows the block to move back when it meets the counter-cutting member 73 and then allow the knives (not visible).

The welding members 68, 69 and cutting 72, 73 are shaped to simultaneously close and then cut, the parts lower and upper of two adjacent sachets, to connect to each other, through the space 40 left free, the welds made in the first welding station and cutting 3 by the electrodes 38 and 39, forming thus a continuous weld delimiting a packaging volume for the liquid.

Two pairs of pinch lips 74, 75; 76, 77, are arranged respectively above and below these tools welding 68, 69 and cutting 72, 73 and are intended to be fixed to the slides 55, respectively 56. The lips 74 and 76 advantageously have an attached tongue 74a, 76a made of an elastically compressible material, such as an elastomeric material used to make the seals. These lips are used to pinch the sheath G during welding and cutting operations. Given that, as will be explained during the relative description during operation, the workstation is moved from up and down by linear motors 50, 51 during welding and cutting operations, pinching lips 74-77 are also used to pull the sheath G without slipping during these welding and cutting operations.

According to a preferred form of the present invention, the bags formed by the welding and cutting units 3, 4 have a valve, for example, like the bag described in EP-0 948 446.

The packaging installation according to the present invention includes, upstream of the welding and cutting 3, 4, a station 2 for loading straws P in the channels formed by the valves formed in the sheath G. This post will now be described with particular reference in Figures 7 and 8.

A transfer disc 78 is pivotally mounted around a horizontal axis perpendicular to the plane of the sheath G. At this indeed, the center 78a of the disc 78 is fixed and the disc 78 is attached to a drive hub 78b pivotally mounted at using ball bearings 79. A pinion 78c secured to the hub 78b is connected to a pinion 80a of a drive motor 80 by a toothed belt 81. The surface of the disc carries twelve radial slides 82, mounted sliding in supports 82a. Each radial slide 82 is pushed towards the center of the transfer disc 78 by springs of recall 83 and each of them carries a push button 84. 82b radial housings are mounted in the radial slides 82 to receive the straws P.

A radial slide 82 on two carries a straw P folded back into insertion position. Advantageously, these straws are previously shaped as described in WO 99/3791. The pushers 84 of the other radial slides 82 located between those carrying the straws P are shaped in perforation organs. In fact, the V valves described in EP 0 948 446 mentioned above occupy the part right of sheath G (Figure 7) and their entrance is closed by a cover that the pushers 84 shaped as organs of perforation are intended to perforate to give access to the valve channel V.

Figure 9 shows the guiding and clamping device different layers of films forming the sheath in which the V valves are formed. In fact there are two guiding and clamping devices 85, 86, one located above and the other below the perforation axis and inserting straws P, consisting of a horizontal line passing through the center of the transfer disc 78.

Each guide and clamping device 85, 86 comprises two fixed support surfaces 87, 88 arranged in V shape between which the edge of the disc passes transfer 78, as well as the ends of the slides 82, 82a. These support surfaces 87, 88 are fixed to a part of frame B2. Clamping surfaces 89, 90, 91 are integral, one 89, a cylinder 92, the other 90, 91 a cylinder 93. Two other cylinders, associated with clamping surfaces counterparts, and of which only the cylinder 93a is visible on the Figure 7 work identically and are used for same purpose as the cylinders 92, 93. They are arranged symmetrically above the valve V and thus allow tighten the film layers of the sheath G on top of this valve V. A film intended to form the outer wall of the sachets as well as a film intended to form the seal of closing of a pocket to contain the curved part of the straw P are arranged between the support surface 87 and the clamping surface 89. The film forming the other wall of the sachet and a first film of valve V formation are clamped between the two clamping surfaces 90, 91, while the second valve film is clamped between the surface of clamping 91 and the bearing surface 88. Devices spacer ball and spring 94, 95 are intended for separate the two clamping surfaces 90, 91 in position cylinder 93.

The fixed center 78a of the transfer disc 78 carries a cylinder 96 (figure 7) aligned with the horizontal axis of perforation and inserting straws P passing through the center of this transfer disc 78 and through the valve channel V aligned with the diameter of this transfer disc 78.

A power station 97 (Figure 8) of the disc transfer 78 in straws P is diametrically opposite the station loading 2 of straws P into the channels of valves V. This post includes fiber optic positioning means 98, to ensure precise angular alignment of the disc transfer 78. A pusher 99 is slidably mounted according to an axis passing through the center of the transfer disc 78. The front part of this pusher 99 has a larger diameter smaller than the back, so you can get into the straw conduit P to keep it aligned in the pushing in a housing 82b secured to the transfer disc 78.

The operation of the packaging facility will now be explained with reference to Figures 10 and 11 which give the chronology of operations relating to the first and at the second welding and cutting stations 4. Being given that the operations relating to the loading station of straws 2 are made on duct G when stationary, as those of the first welding and cutting station, while the second welding and cutting station 4 is also used for advance the sheath step by step and therefore performs a movement vertical alternating with the operations of welding and cutting, loading station operations straw 2 and the first welding and cutting station 3, between operations of the second welding station and cutting 4.

First of all, it should be noted that the feed rod in liquid 41 drops to a level arriving at mid-height cutting tools 42, 43 (Figures 1, 2 and 4), that is to say at a level situated substantially below the first welding station, thus making it possible to carry out continuous and constant flow liquid supply without that the liquid does not overflow.

While the duct G is stopped, the loading station of straws 2 first performs the drilling operation of the film closing the inlet of valve V. For this purpose, the cylinders 92, 93 tighten the support and clamping surfaces 87-91 one against the other, immobilizing the sheath G. The jack 96 placed in the center of the transfer disc 78 is actuated and pushes the slide 82 secured to a piercer 84 in the direction sheath G to provide an opening through it allowing access to the valve V channel. The cylinder 96 goes back and the slide 82 is brought back by return springs 83.

Then the motor 80 rotates the transfer disc 78 of 30 °, corresponding to an angular step separating two adjacent runners 82, to place a runner 82 into which a straw P has been loaded. The cylinder 96 is then pressed again to engage the end front of the straw P in the channel of the valve V. The depth of engagement of straw P in valve V is chosen to keep the valve closed. The cylinder 96 returns in its initial position and the springs 83 return the slide 82 backwards, while the straw P remains engaged in the valve channel V.

Drilling and loading of straw P which have just been described take place simultaneously welding and cutting operations at the first workstation welding and cutting 3. The chronology of these is illustrated in Figure 10. The cylinders 15 and 16 press the tools 33, 34 and the tools facing them and of which only the tool 35 is visible in Figures 2 and 4, one against others. The welding electrodes 38, 39 are then supplied with current pulses for welding of the sheath G. Then, the jack 44 is actuated to bring the knives 42, 43 into the receiving grooves facing them and of which only the throat 46 is visible in Figure 4, thus cutting the sheath G on the outside welds formed by the electrodes 38, 39 and the thus separating from the rest of the sheath G.

As seen in Figure 1, the electrodes of welding 38, 39 and the knives 42, 43 are two different levels, so the welding operations and cutting carried out almost simultaneously by the welding and cutting station, are carried out on two bags succeeding one another along the sheath G. Thus, a bag is sealed while the one that is right below it is filled with liquid and simultaneously cut. During the next operation cycle, the sachet that has welded has come down one step and is therefore opposite knives 42, 43.

The chronology of the welding and cutting operations of the second welding and cutting station 4 is illustrated by the FIG. 11 with more specific reference to FIGS. 5 and 6. At first which is at the end of the operations the first welding and cutting station 3, the cylinders 53, 54 push the tools 72-77 against each other, so that the sheath G is pinched between the lips 74, 75, on the one hand, and between the lips 76, 77 on the other hand, these two pinch lines above it, respectively below the welding tools 68, 69 and cutting tools 72, 73. During the following operations, all of the bodies mounted on the chassis 47 will be driven down by linear motors 50, 51.

The length of the downstroke will correspond exactly the length separating two successive sachets or to that separating two successive valves V, which amounts to the same. However, while the V valves are formed on sheath G with regular and precise spacings before the operation of conditioning the liquid in the sachets, the sachets are only formed during the packaging operation, simultaneously with it so these are the V valves which serve as reference means.

Then, the jacks 64, 66 controlling the tools for welding 68, 69 corresponding to the electrode and the counter electrode welding, press these tools together. The electrodes are supplied with current by pulse, which limits the welding time, then cool immediately after in an extremely long time short, the counter-electrode 69 being able to serve as a cooling by being connected to means (not shown) for example a Peltier bimetal, to lower quickly its temperature, while maintaining the parts tightly welded, which is not possible with heating by resistance. Cooling after welding in keeping the pieces tight is important in this case. In indeed, at the time of this welding, the sachet is filled with liquid and was therefore deformed, so that the welded surface gondola. Keeping it tight during cooling, the appearance of this welded portion is significantly improved.

Then the cylinders 64, 66 are open and it is slides 57, 58 to be moved by the motors M1, M2, M3, M4 to bring the tools cut 72, 73 in place of the welding tools, i.e. by moving the sliders 57, 58 to the right by compared to figure 5. After this displacement, these are the cylinders 59 and 60 which bring the cutting tools 72, 73 together by projecting the knives of tool 72 to make them penetrate the grooves of the counter cutter tool 73 while cutting in passing the portion of sheath G corresponding to previously welded portions. Note in Figure 6 that the welded portions and the cut portions serve to connect the two portions together welded by electrodes 38, 39 (Figure 2) and cut by knives 42, 43, on either side of space 40 left free to allow the passage of the feeding rod in cash 41. However, while the first welding and cutting station 3 performs operations welding and cutting respectively on two successive sachets, the second welding and cutting station 4 performs simultaneously welding then cutting of two parts lower, respectively upper, of two sachets successive. At the same time, the lower bag whose part upper was welded is separated from the sheath G after the cutting operation.

Once the cutting is complete, the cylinders 59, 60 are brought back, then it is the turn of the cylinders 53, 54 to be brought back. At the same time, at the end of this welding and cutting operation of the second station welding and cutting 4, the sheath G is lowered by one step corresponding to the height of a sachet, so that the first welding and cutting station 3 can start again its operating cycle.

While the first welding and cutting station 3 performs its operations, the chassis 47 of the second welding and cutting 4 is brought up one step by linear motors 50, 51.

It is also during this time interval that carry out the perforation and loading operations of straw 2 that we are going to describe, given that this is also on the stationary sheath that these operations are carried out. After the sheath G has been moved by the second welding and cutting 4, a valve V is aligned in line with the diameter of the transfer disc 78. A slide 82 carrying a piercer 84 is positioned on the diameter of the transfer disc 78 aligned with the the valve V. The four cylinders 92, 93, 93a (the cylinder 92a not being visible) push the bearing surfaces 89, 90 against each other as well as against the surfaces of fixed supports 87, 88, on either side of valve V. The intermediate bearing surface 91 is clamped between the surfaces 90 and 88 support. The different layers of film forming the sheath G are thus firmly held in place on either side of valve V.

The cylinder 96 pushes the radial slide 82 in the direction of valve V, so that the perforator 84 perforates the film which closed the entrance to the valve V channel. We recall that in this example, we assume that the sheath G and the valve V are conformed as described in EP-0 948 446 to which can refer. However, the invention can obviously also apply to other types of sachets fitted with valves. When the cylinder 96 moves back, the return springs 83 bring the slide 82 back with the piercer 84.

The motor 80 then drives the transfer disc of a step, in this example, this step corresponding to 30 °, placing thus a next slide 82 carrying a straw P on the line connecting the center of the transfer disc 78 to the valve channel V. The cylinder 96 is again actuated to push slide 82 and engage straw P in the channel of valve V. Once the engagement of straw P is finished, the four cylinders 92, 93, 93a (the cylinder 92a not being visible) move backwards, loosening the film layers of the sheath G.

Simultaneously with the straw loading operation P in the valve channel, pusher 99 diametrically opposite valve V with respect to the transfer disc, is also operated to push a straw P into the slide 82 diametrically opposite.

This perforation and loading operation of the straw P being simultaneous with the operation of the first post welding and cutting 3, a new cycle of the second welding and cutting station 4 with sheath drawing G can start again.

Claims (11)

Installation for conditioning doses of liquid in sealed bags made from a sheath (G) of a flexible heat-sealable material, open longitudinally, comprising a vertical frame (B) comprising means (50, 51, 74-77) to scroll this sheath (G) from top to bottom, a feed rod (41) of said liquid entering said sheath (G) through said longitudinal opening, welding means (38, 39) from said longitudinal opening to below the passage of said supply rod (41) through said longitudinal opening, transverse welding means (68) for connecting the opposite longitudinal edges of said sheath (G) below the distribution end of said feed rod (41) and cutting means (42, 43, 72, 73) for separating the sachets containing said doses from said sheath, characterized in that it comprises a first welding and cutting station (3) , arranged on both sides other of said feed rod (41), to provide first welds and cutouts outside these first welds, a second welding and cutting station (4) below the end of said rod feed (41), to form transverse welds to connect the two adjacent ends of the first welds located on either side of said feed rod of two adjacent pairs of said first welds and to form cutouts on the outside said transverse welds. Installation according to claim 1, characterized in that said first and second welding and cutting stations (3, 4) each comprise at least two supports (11, 12; 59-62) arranged on either side of said sheath (G), guide means (13, 14; 47a, 47b) of these supports (11, 12; 59-62) in a direction transverse to the travel of said sheath (G), actuation means (15, 16; 53, 54) to move said supports (11, 12; 59-62) along their respective guide means, in opposite directions to each other to bring them closer or away from each other, welding means (38, 39, 68, 69), cutting means (42, 43, 72, 73) and fixing means (21-24, 36, 100, 101) for connecting said welding means (38 , 39, 68, 69) and cutting (42, 43, 72, 73) removably to said respective supports (11, 12; 59-62). Installation according to one of the preceding claims, characterized in that the supports (59, 60) of the cutting and welding means (69, 73) of said second welding and cutting station (4) located on one side of said sheath (G) and the supports (61, 62) of the cutting and welding means (68, 72) of this same welding and cutting station (4) located on the other side of said sheath (G) are each integral with an independent actuator (63-66) for moving the supports (59, 60) arranged on one side of said sheath (G) and those (61, 62) disposed on the other side of this sheath (G), against each other and to separate them from each other, and in that two sliding devices (57, 58), are displaceable according to two horizontal trajectories and parallel to each other, each of them being kinematically integral with two of said supports (59, 60, 61, 62) located on the same side of said sheath (G), and are engaged with ec drive means (M1-M4) for sliding them along said paths, alternately in two opposite directions, so as to alternately put said welding means, respectively cutting in a working position determined relative to said sheath (G). Installation according to claim 3, characterized in that each of the two sliding devices (57, 58) kinematically integral with said respective supports (59-62) arranged on either side of said sheath (G), are integral with two members respective slides (55, 56) mounted on guide means (47a, 47b) defining a horizontal trajectory, perpendicular to those of said sliding devices (57, 58), said sliding members each being engaged with drive means ( 53, 54) in order to bring them closer, alternately to move them away from one another, gripping means (74-77) of said sheath (G) being integral with said sliding members (55, 56), the guide means ( 47a, 47b) of these sliding members (55, 56) being integral with a chassis (47) engaged with vertical guide and drive means (50, 51) for driving said chassis alternately up and down and bottom up, the length of this head stroke being determined as a function of the vertical dimension of said sealed bags. Installation according to claim 3, characterized in that the vertical position of the welding (38, 39) and cutting (42, 43) means of said first welding and cutting station is fixed during the packaging process, these welding means (38, 39) and cutting (42, 43) being aligned vertically on either side of said sheath (G) with a spacing corresponding to the pitch separating two of said successive sealed bags. Installation according to claim 5, characterized in that said welding (38, 39) and cutting means (42, 43) are integral with a common support (5) connected to said frame (B2) by height adjustment means (7, 70, 71, VR) and locking (10) of these adjustment means. Installation according to one of the preceding claims, characterized in that said welding means (38, 39, 68) are constituted by electric pulse heating means. Installation according to one of the preceding claims, characterized in that said welding means (68) comprise a counter-support (69) associated with cooling means. Installation for conditioning doses of liquid in sealed bags comprising a valve (V) formed by a channel formed between two thermoplastic films arranged inside said sheath at the location of each of said bags, extending transversely to said sheath and a pocket, the bottom of which is adjacent to the inlet of said valve channel (V), according to one of the preceding claims, characterized in that it comprises, upstream of said first welding and cutting station (3) , a station (2) for introducing one end of a straw (P) into said valve channel (V), this station (2) comprising means (84) for piercing the bottom of said pocket adjacent to the inlet of said valve channel (V) and means (82) for inserting one end of a straw (P) into the inlet of said valve channel (V) and the rest of said straw (P) into said pocket. Installation according to claim 9, characterized in that said station (2) for introducing a straw (P) into said valve channel (V) comprises means (87-93) for flattening and tightening said sheath (G) and on the other side of said valve channel (V), a transfer disc (78) pivotally mounted and substantially coplanar with said flattened sheath (G), a plurality of radial housings (82b) for said straws (P), distributed equiangularly over this transfer disc (78), an equivalent series of radial guide means (82) for said means (84) for piercing the bottoms of said pockets, alternating with said housings (82b), means (80, 81) for moving said disc transfer (78) step by step to successively bring a piercing member (84) and one of said radial housings (82b) in alignment with each of said valve channels (V), and means (96) for moving radially and alternately towards the exterior of said transfer disc (78) said transfer member bore (84) and said straw (P) when they are respectively in alignment with said valve channel (V). Use of the installation according to one of the previous claims for filling packaging continuously from said sheath (G) by said liquid simultaneously with the steps of welding and cutting the perimeter said sachets.

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