ITMO20010070A1 - FLUID CONTAINER, RELATED DEVICE AND OPENING METHOD E-CLOSURE - Google Patents

Description

Description of the industrial invention entitled:

"CONTAINER FOR FLUIDS, RELATED DEVICE AND METHOD OF OPENING AND / OR CLOSING",

TEXT OF THE DESCRIPTION

The invention relates to containers, particularly of the type obtained by thermoforming from a sheet of plastic material or of the type obtained from plasticized and / or aluminized cardboard folded and welded along the edges or of the soft type such as the so-called "bags" or "polybags" , equipped with an opening and closing system.

The containers, the opening / closing devices, and the opening / closing methods are also subject to patent rights with independent claims.

These types of containers are widely used for their lightness, hygienic safety, impact resistance, but above all for their low cost, in the packaging of liquid or pasty products such as detergents, cosmetics, lubricants or other kinds, or food liquids such as milk, fruit juices, wines etc.

In the face of these advantages, however, they are lacking in that they do not have an effective and economical practical opening / closing system to be used after the container has been opened for the first time.

For thermoformed plastic containers, solutions are known, for example, in patents US3278085, WO94 / 08852, WO95 / 25665, WO96 / 01212, WO96 / 14254, WO97 / 17268, WO98 / 10993, WO99 / 48768 which however have some shortcomings.

US 3278085 does not guarantee a stable seal and is not very practical to use.

WO94 / 08852 in the version with screw cap cannot have a good seal since the neck on which the cap is screwed is necessarily of oval section and therefore the threaded areas can separate due to the elastic deformation of the neck itself, a closure must also be present safety, consisting for example of a breakable wall integrated into the container and arranged under the cap, this is quite difficult to achieve.

WO94 / 08852 in the version with external pressure cap cannot guarantee a good seal especially in the points where the welding fins are present.

Also in W095 / 25665 the screw cap placed inside the neck cannot guarantee a good seal, especially near the welded edges, furthermore the production process is more complicated.

In WO96 / 01212 the pressure cap inside the neck cannot have a good seal, especially in the presence of even a modest pressure, if then to favor the seal of the cap it is constructed in such a way as to require a certain forcing for re-insertion, then it becomes difficult both opening and closing.

In W096 / 14254, the container near the opening has a peelable area which can remain open by means of an axially sliding ring, and can be closed with the aid of a fork that is press-fit on the outside of the coupled flaps: the fork is not very practical to use and also does not guarantee sealing as it acts only on a small part of the coupling surfaces. Also the longitudinally sliding ring on the neck is of little practicality and cannot be of help for sealing since it does not act directly on the mating surfaces.

In W097 / 17268 a tubular element with relative screw cap is re-inserted during the container shaping phase: the system is quite expensive to make and also presents difficulties in guaranteeing the sealing between the element with the screw cap and the container body.

For WO98 / 10993 the same comments made to US 3278085 and WO96 / 01212 apply.

In W099 / 48768 the seal should be guaranteed by a forced interlocking between the two surfaces constituting the neck of the container and by the presence of adhesiveness between the surfaces themselves: in this case too, however, the interlocking acts only on a small part of the sealing surfaces. and the adhesiveness cannot give a stable coupling, especially when said surfaces are wet.

Among the containers of the type obtained from plasticized and / or aluminized cardboard folded and welded along the edges, a model with a rectangular or square base with an upper closure with inclined flaps ("gable top") is known. This type of container, as illustrated for example in EP331792, EP448882 and US6024280, has a fair commercial diffusion mainly because it can be easily opened without the intervention of scissors or other cutting tools. Furthermore, as provided in US3458110, US4619398, US4979668 and US5462222, it is also possible to close the opening of this container by applying a gripper element to the folded flap. This "gable top" container has a first drawback in the fact that it cannot be superimposed or that in any case, if superimposed with the help of interposed means, it causes space losses.

A second drawback lies in that when it is used with the aforementioned closing elements, many manual operations are required to be carried out in sequence, which in order are: removal of the pliers, lifting of the flaps, extraction of the spout, and vice versa for closing .

Another type of container made from plasticized or aluminised cardboard folded and welded along the edges, has a parallelepiped shape with a flat (and therefore stackable) lid. Examples of these containers are shown in EP115813, EP465834, US4634008 and a first series of opening / closing means applicable to them are in EP2 14791, US4915290, US4925034, US4934590 and US5101999. These opening / closing means are made so as not to protrude excessively with respect to the plane of the upper face of the container and therefore allow it to overlap, however they cannot in practice guarantee airtightness due to the impossibility of obtaining a perfect and stable coupling between the surfaces of tightness, or due to the impossibility of maintaining good adhesiveness between the surfaces (in the case of EP214791), especially when these are wet. A second series of means for opening / closing, as shown for example in US4813578, US4948015, US4964562, US5297696, US5833112, US5960992, WO95 / 05996, WO96 / 11850 and W099 / 42375, effectively allow a good hermetic closure due to the presence of a screw cap, however, the possibility of overlapping the containers is sacrificed in these cases, due to the presence of the protruding cap. There are also other drawbacks, such as:

- the relatively high cost due to the presence of at least two molded plastic elements of complicated shape and not negligible dimensions,

- the possibility of losing said screw lid which is detached from the container, - the scarce practicality of having to unscrew and screw the lid.

EP543766 shows a closure device to be applied to the spout of a cardboard container, this device has the following drawbacks:

the need to open the container by other means (cutting with scissors),

- the need to remove and relocate this device at each opening and closing operation, this being somewhat inconvenient and also risking losing the device,

poor sealing, especially in the central part of the opening since little or no closing force is exerted here,

the poor seal in the presence of even modest pressure inside the container, since the closure device can slip away from it, not being stuck to the container,

- the construction of the device in two pieces.

The object of the invention is to improve the aforementioned state of the art.

In a first aspect of the present invention a container for fluid products is provided, comprising a first wall and a second wall, at least one of which is thermoformed and between which a cavity is defined to contain said products, said first wall and said second wall being welded in an edge, between said first wall and said second wall a conduit is also defined which is intended to lead into an opening of said container, said conduit being closable by mutual contact of said first wall and said second wall, characterized by this, that said duct cooperates with a pressure device which acts directly in a section which substantially crosses the whole of said duct from side to side.

In an advantageous version of the invention, the duct is shaped in such a way as to allow the closure by simple elastic deformation of the walls, avoiding the risk of breakage or permanent deformation of the walls.

In a second aspect of the present invention a container for fluid products is provided, comprising a first wall and a second wall, at least one of which is thermoformed and between which a cavity is defined to contain said products, said first wall and said second wall being coupled in a first joint and in a second joint which jointly circumscribe said cavity, at least the coupling in said second joint being removable by peeling so as to define an opening of said container, characterized by the fact that said second joint is extends in a substantially straight section.

In a second advantageous version of said second aspect, said opening is determined by a deformation of said first wall and by a symmetrical deformation of said second wall.

In a second advantageous version of said second aspect, respective appendages of said first wall and of said second wall are present in a median region of said second joint.

In a third aspect of the present invention a container for fluid products is provided, comprising walls between which a cavity is defined to contain said products, said walls being welded in an edge projected towards the outside of said cavity, between said walls a duct being also defined which is intended to lead into an opening of said container, characterized in that said edge has means for retaining devices adapted to open and / or close said duct by mutual moving away / approaching said walls.

In an advantageous version of said third aspect, said means comprise recesses and / or protuberances.

In a fourth aspect of the present invention there is provided a container for fluid products comprising walls welded in an edge, said walls being decoupled in said edge by peeling so as to form an opening of said container and being able to be coupled to determine the closure of said container. by means of the aid of a pressure device, characterized in that said pressure device comprises anchoring means to said walls adapted to act to cause said peeling.

In a fifth aspect of the present invention there is provided a container made from a sheet of folded cardboard and welded at the edges, characterized by this, which has a pressure device attached comprising a pair of bars arranged in a "V" shape, hinged near the joining ends and free to move in opposite ends, characterized in that said bars comprise coupling means adapted to keep said opposite ends mutually close

In a sixth aspect of the present invention, a method is provided for opening and / or closing a container for fluid products comprising walls welded into an edge, said walls being decoupled in said edge by peeling so as to form an opening of said container, said opening cooperating with pressure devices adapted to close said opening, characterized in that it comprises acting with said pressure devices to cause said peeling.

In a seventh aspect of the present invention a pressure device is provided, suitable for closing a container with flexible walls, comprising a pair of bars arranged in a "V" shape, hinged near the junction ends and free to move at opposite ends, characterized hence, said bars comprise hooking means adapted to keep said opposite ends mutually close. In a first advantageous version of said sixth aspect, said bars have a curved shape, with the convex walls facing each other.

In a second advantageous version of said sixth aspect, said pressure device is made of monobloc plastic material.

In a third advantageous version of said sixth aspect, said pressure device comprises anchoring means to said container which act even while said device is in the open position.

In a fourth advantageous version of said sixth aspect, said pressure device further comprises second hooking means adapted to keep said device stably positioned in an open position.

An eighth aspect of the present invention provides a method for opening a container of the type comprising a first wall and a second wall, at least one of which is thermoformed and between which a cavity intended to contain a fluid product is defined, said first wall and said second wall being coupled in a first joint and in a second joint which together circumscribe said cavity, said second joint being developed in a substantially straight section, at least the coupling in said second joint being removable by peeling so as to define an opening of said container, characterized in that it comprises symmetrically bending said first wall and said second wall at said second joint.

In an advantageous version of this eighth aspect, said bending comprises bending around axes substantially parallel to the longitudinal axis of said opening.

The invention will be better understood with the aid of the attached drawings in which:

Figure 1 represents a container, of the type obtained by thermoforming and welding from two sheets of plastic material, made according to the invention, in the closed and still sealed state.

Figure 2 represents the container of Figure 1 in a partial perspective view showing the open state.

Figure 3 is a view like that of Figure 1, when the container has been opened and closed.

Figure 4 represents the container of Figure 1 in a partial perspective view of the container still sealed according to a variant of the invention.

Figure 5 is a plan view of a pressing device in the open state, present in the previous Figure 4.

Figure 6 is a plan view of the pressing device of Figure 5, in the closed state.

Figure 7 is a partial and greatly enlarged side view of the container of Figures 1, 2, 3 and 4, showing a joint obtained on one of the welding edges near the opening.

Figure 8 is a view like that of Figure 7 showing in section the pressure device of Figures 2, 3 mounted in the joint.

Figure 9 is a partial and greatly enlarged plan view of the terminal part of the presser of Figures 2, 3, in the closed state.

Figure 10 is the X-X section of Figure 9.

Figure 11 is the section Xl-XI of Figure 9.

Figure 12 is the ΧΠ-ΧΠ section of Figure 9.

Figure 13 is a plan view of the pressure device of Figures 2, 3, shown in the configuration as it is printed.

Figure 14 is a perspective view showing a variant of the pressing device according to the invention, in the open state.

Figure 15 is a perspective view like that of Figure 14, in the closed state.

Figure 16 is a perspective view of a further variant of the pressure device according to the invention.

Figure 17 is the section XVH-XVII of Figure 2, with the container open.

Figure 18 is the section like that of Figure 17, with the container closed.

Figure 19 is the section like that of Figure 17, however referred to a container according to the state of the art.

Figure 20 is the section like that of Figure 19, showing the inappropriate behavior in closing.

Figure 21 is a partial and interrupted perspective view of a container such as that of Figure 1, however, showing particular joints and protrusions for the attachment of a pressure device.

Figure 22 is a perspective view like that of Figure 21, with the pressure device mounted.

Figure 23 is a schematic plan view of Figure 22, in the open state.

Figure 24 is a perspective view of a further variant of the pressing means, as an alternative to the pressing means of Figures 22, 23.

Figure 25 is a partially interrupted side view of a further pressure device according to the invention, mounted in the corner of a container with thermoformed walls.

Figure 26 is section XXVI-XXVI of Figure 25.

Figure 27 is a perspective view of Figure 25.

Figure 28 is an interrupted perspective view of a parallelepiped-type container made from folded cardboard, still sealed and fitted with a pressure device according to the invention.

Figure 29 is a strongly enlarged and interrupted perspective view of the container of Figure 28 showing the opening step by peeling.

Figure 30 is a greatly enlarged and interrupted perspective view of the container of Figure 28 showing a different conformation of the handles for peeling.

Figures 31, 32 and 33 are sections, in correspondence with the handles for peeling, of pressure devices according to the invention, showing three respective variants of the anchoring to the handles of the container.

Figure 34 is a broken view of section XXXIV -XXXIV of Figure 33.

Figure 35 is an interrupted perspective view of a pressure device such as that of Figures 25, 26, 27, with hygienic protections, moreover mounted on a container such as that of Figure 28, in which the opening was obtained by removing a corner of the container itself.

Figure 36 is section XXXVI-XXXVI of Figure 35.

Figure 37 is the section like that of Figure 36, with the container closed.

Figure 38 is an interrupted side view of a folded cardboard container according to the invention, near the area intended for opening.

Figure 39 is an interrupted perspective view of a folded cardboard container, of the type known as a "gable top".

Figure 40 is a perspective view of the container of Figure 39 in the open state, according to the state of the art.

Figure 41 is a perspective view of the container of Figures 39, 40, with a pressure device according to the invention inserted, in the open state.

Figure 42 is a view like that of Figure 41, in the closed state.

Figure 43 is a view of a presser as in Figure 5, however with a different hooking system.

Figure 44 is a partial and interrupted view like that of Figure 43, showing the anchoring phase to the container.

Figure 45 is a view of the presser of Figure 43, in the closed state.

Figure 46 is a perspective and interrupted view showing a construction phase by extrusion of the presser of Figure 43.

Figures 47 and 48 are partial views of pressure devices with different hooking systems. Figure 49 is an interrupted side view of a container such as that of Figure 1 with a further version of the pressure device according to the invention.

A container 1 of the type obtained from two sheets 2 of thermoformed plastic material peripherally welded along a protruding edge 3, has in the upper part a duct 4 11 which ends in an appendage 5 circumscribed by the said heat-sealed edge 3 which guarantees the original sealing of the container 1.

This appendage 5 can be detached at the first opening by tearing it along pre-scored fracture lines 6, by traction on the ring 7.

As shown in Figure 2, where the container is shown open without the appendix 5, immediately below the opening 8 there is a pressure device 9 formed by two bars 10 arranged in a "V" shape, hinged in an X axis near the vertex of conjunction 11.

As illustrated in Figures 7 and 8, this presser 9 in the vertex 11 is stably anchored to the container 1, by snap insertion into a suitable joint 12 obtained on the edge 3; it is pointed out that this insertion can already be carried out in the production plant, but for simplification it could also be easily carried out by the user, since said presser 9 is attached to the package in another way.

Said presser 9 can be advantageously and economically constructed of molded plastic material in one piece.

On the ends 13 opposite to the hinged zone 11, these bars 10 are able to interlock reciprocally and stably, when they are approached by the force exerted by two fingers in the direction of the arrows A. Such an interlocking mechanism is illustrated in detail in Figures 9, 10, 11 and 12.

The interlocking mechanism M cooperates with appendages 14 which, if vertically approached in the direction of the arrows B, cause the release and opening of the pressure device 9.

This mechanism is extremely practical and effective since, by simply pressing the index finger and thumb vertically or horizontally, the container 1 is opened or closed.

Advantageously, in order to better distribute the sealing action along the section transversal to the duct 4, the internal faces 15 of the bars 10 are provided with a slight curvature with a convexity turned inward.

Furthermore, again to improve the sealing action, said internal faces 15 are provided with one or more longitudinal projections 16: as shown in Figure 10, a shape that allows optimal coupling and maximum pressure in said coupling area, has a of the internal faces 15 flat and the other with a longitudinal ridge 16.

The container of Figure 4 differs from that of Figures 1, 2 and 3 in that the two thermoformed sheets 2, near the fracture line 6 and the pressure device 9, are flat and substantially close together: such a configuration can facilitate the opening operation since it can be obtained by repeatedly rotating the appendix 5 in the direction of the arrow 17, in this case a slight increase in pressure will be necessary to make the liquid escape, caused by the crushing of the container 1 in order to space the sheets 2 in the duct 4.

In order to make the positioning of the closed presser 9 more stable, even in the presence of fluid pressure, a further joint 18 is provided on the edge 3 opposite to that where the joint 12 is present. in containers of the type previously described in Figures 1, 2 and 3.

Figures 4 to 6 show a pressure device 9 with a different hooking system.

Figures 14 and 15 show a further variant of the pressure device 19 which allows the opening and closing of the container by transversal sliding in the direction of the arrows 20.

Figure 16 shows a pressure device in which the approaching and distancing of the ends 13 is obtained mainly by elastic deformation of the bars 10, the bars 10 being joined in the vertex 11 in a fairly rigid way. In this case the slot G between the bars 10 close to the vertex 11 can be exploited to obtain the stable anchoring of the pressure device 9 to the edge 3 of the container 1 by simple pressure insertion, without however having the need for the joint 12 in the edge. 3. In order to improve said anchoring, the internal faces 15 in correspondence with the slot G can advantageously be provided with projections, extending in a direction orthogonal to the projections 16 and with a "sawtooth" cross section. Advantageously, the edge section 3 in which this type of presser 9 is to be inserted will be equipped with grooves N, parallel to the edge 3 and easily obtainable during the welding phase, in which said "sawtooth" projections can firmly engage. Figure 17 shows the perfect conformation of the duct 4 in the section corresponding to the presser 9, 19: since the edges 3 are defined in a plane P, the wall 2 is connected to said plane P with a radius of curvature R such that said wall 2 can assume a plane shape corresponding to said plane P by simple elastic deformation within its own elastic limit; in this way an optimal coupling of the walls 2 with a small force F is obtained, without the risk of breakage or permanent deformation of the walls 2.

Advantageously, since the thickness of the wall 2 in millimeters is equal to S, this radius of curvature R (expressed in mm.) Will be: R> 36S <2>.

As shown in Figures 19 and 20, the same force F exerted in a conduit 4 of traditional shape does not allow it to close, however causing considerable stresses on the walls 2 near the edges 3, which can also cause breakages.

Figures 21, 22, 23 illustrate the application of a presser 9 to a container of the thermoformed type whose duct 4 ends in a section 27 where the walls 2 are welded in a way that can be decoupled by peeling. Said portion 27, substantially straight, extends between two edges 3 where the weld is instead stable. The walls 2 extend into the median part of said section 27 in the form of two appendages 28 spread outwards; advantageously the terminal parts of the appendages 28 have enlargements 29, easily obtainable by melting and / or folding, able to lock into the joints 24 of the presser 9. As in the previous case, the presser 9 can already be positioned in the factory, or it can be the user himself to insert it easily by transversal sliding in the direction of arrow F2.

It should be noted that the container 1 can also be of the type with a decoupled (peelable) joint extended both in the portion 27 and throughout the remaining edge 3, although the area involved in the peeling is only that of the portion 27.

The particular curved shape of the bars 10 in addition to the already mentioned advantage, in this case offers a first further advantage in allowing the insertion of the flaps 28 into the joint 24 without interference of the end 13 which is already spread apart, and a second further advantage in the fact that this splayed state of the end 13 allows a better grip on the fingers to exert the peeling action.

As illustrated in Figures 22 and 23, in order to keep it open stably, the presser 9 can also be equipped with further interlocking means 30 arranged beyond the X axis, the open position can in any case be reached automatically and stably upon release. of the ends 13, due to an elastic return at the junction point 11.

The presser of Figure 24 is similar to that of Figures 22, 23 but has the joints 24 arranged laterally: the advantage of such a shape is that the presser 9 can be obtained with simple two-element molds.

Figures 25, 26 and 27 show a container 1 of the type with walls 2 thermoformed and welded in an edge 3 whose opening is obtained by cutting or detaching a corner 32; in this case the presser 9 has, adjacent to the hinge 11, a protuberance 33 with a base extended in a direction D and shaped with a U-shaped section suitable for being fitted onto the edge 3 of the container 1.

In order to make the coupling stable, as shown in Figure 26, the branches of said protuberance 33 have "sawtooth" projections 34 on the inside and the corresponding edge 3 is equipped with longitudinal grooves N, easily obtainable during the welding, in which said projections 34 can firmly fit.

Furthermore, the defined plane D1 of the bars 10 forms with respect to said direction D an offset angle Z of at least 15 °, advantageously about 30 °.

The pressure device 36 of Figures 28 and 29 is used in a parallelepiped container 35 obtained by folding and welding along the edges of a sheet of waterproofed cardboard. Said presser 36 has a recess 37 adapted to be inserted into the welding edge 38 and two joints 24 suitable to receive and lock corresponding protuberant tabs 39 of said edge 38; the said recess 37 is therefore located in the axis of symmetry K arranged on the plane defined by the median axes of the two bars 10.

The welding edge 38 in correspondence with the presser 36 is not stably welded as in the other parts but is welded so that it can be peeled off by removing the tabs 39.

Therefore, the pressure device 36 can be used both for carrying out the first peeling opening and for carrying out the subsequent hermetic closure.

As is clearly evident in the Figures, the tabs 39 also allow the firm anchoring of the presser 36 to the container 35 even in the open state, thus avoiding the danger of losing said presser 36 and the inconvenience of always having to reposition it. As shown in Figure 28, the presser 36 can already be mounted in the right position, on the flap 40 folded down, directly in the production plant, while maintaining the possibility of overlapping and bringing the containers 35 together.

This detail is important since these containers are currently directly stacked on pallets in supermarkets, and thus are also exposed to customers, therefore these containers are not (and cannot) be equipped with any means for hermetic sealing to be used after the first opening.

In order not to penalize the speed of the packaging production process, the presser 36 can be attached to the package in different ways, for example by attaching it with a point of hot melt glue to one of the walls of the container 35, in which case it will be the user who will insert it. easily in the flap 40 after having raised it; the tabs 39 will not be welded so that they appear to the user already spread apart.

The tabs 39 of Figure 29 are formed in protuberance with respect to the normal welding edge 38, therefore to avoid unnecessary scraps, it is convenient to have a recess in correspondence with said tab 39 in the edge of the bottom seal of the container. illustrated tabs 39 formed inside the normal protrusion of the edge 38; in order to avoid the risk of tearing, the edge 38 will be shaped with recesses 41 with a profile well connected to the tongue 39.

Figure 31 illustrates a system for anchoring the bars 10 of the presser to the tabs 39: this is obtained by rotating the bolts 42, integrated with the presser itself and penetrating the thickness of the tabs 39 at the points 43 (Figure 30).

In Figure 32 the tabs 39 are welded, for example with an ultrasonic vibration system, in an upper portion of the surface W of the bars.

The tabs 39, as in the illustrated examples, are made entirely of the same material as the walls 2 but may, moreover, be made up of distinct elements connected to the walls 2, for example by ultrasonic welding.

In Figures 33 and 34 the tabs 39 are slidably inserted inside a slot 44 of the presser where there is a longitudinal ridge 45 with a "sawtooth" section, gradually protruding into the slot 42 so as not to offer an obstacle to the insertion of the tab 39 in the insertion direction F2 and to allow instead the maximum resistance to sliding in the orthogonal direction.

Figures 33 and 34 show an elastic lip T arranged in the upper part of one of the bars 10 which, in the closing phase, rests on a corresponding wall of the other bar 10, in this way a hygienic protection is obtained which prevents contamination. edges of the opening subject to contact with the liquid being dispensed.

Figure 35 shows a presser of the type illustrated in Figures 25, 26, 27, applied to a container of the type illustrated in Figure 28, in this case, however, the opening is obtained by cutting or tearing one end of the flap 40 according to note mode.

This presser also has a hygienic protection formed in this case by an elastic lip T on each bar, whose operation in opening and closing is illustrated in Figures 36 and 37.

As shown in Figure 38, instead of the tabs 39, the container 35 has in the edge 38 a first portion 3a facing outwards, not welded, a second portion 3b welded in a peelable manner and arranged between said first portion 3a and the cavity, and all the remaining part 3c welded in a stable manner. The first section 3 a can correspond to a single median zone of section 3b, it can correspond to the whole zone of section 3b but, as illustrated, it can also extend beyond. The anchoring to the presser / retractor device 36 will be carried out in said first portion 3 a of the non-welded edge 3.

Figures 39 and 40 show a cardboard container of the "gable top" type 46 in the closed state and in the open state, respectively. The opening 47 which is normally formed in these types of containers has an exaggeratedly high extension L1 and is not justified by practical needs of use but it is so for intrinsic reasons.

As shown in Figures 41 and 42, the opening 47 is made cooperative with a pressure device 9 of the type shown in Figures 25, 26, 27, 35, but with an overturned "U" profiled protuberance 33 of much larger length L , advantageously greater than half the length of a bar 10. Therefore, in this way the opening 47 is made stably closed in the section L by the U-shaped protuberance, and can be closed on request in the section L2 by applying a force with the index finger and thumb. in the direction of the arrows A. To obtain the opening, a force will be applied, with the index finger and thumb, in the direction of the arrows B.

Figure 43 shows a pressure device with a different coupling system in the ends 13 and with a different hinging of the bars 10, in this case the closure and coupling of the ends 13 is obtained, very easily, by pressing between the thumb and forefinger in the position of arrows C while opening is obtained, just as easily, by pressing in the position indicated by arrows H (Figure 45). This occurs because by pressing on the lever 48, the tooth 49 moves away from its coupling by rotation around the hinge 50.

As shown in Figure 44, by forcing the opening of the presser 9 in the direction of the arrows L, it is possible to easily insert the edge 3 into the slot G.

Figure 46 shows how this type of presser 9 can be obtained by cutting along the lines 51 of a section obtained by extrusion, making the pressing device 9 itself even more economical.

The cut along the lines 51 can also be only partial, leaving some connection points between each element and its adjacent one, therefore the pressers 9 would remain assembled in forms of bars or rolls in order to better serve a possible machine capable of positioning said pressers on the containers. , the individual pressing elements being automatically detached from the aforesaid machine.

In Figure 47, the hooking tooth 49 operates inside a hole 52 of the bar 10, which allows, with respect to the model of Figure 45, a smaller transverse dimension of the presser 9.

In Figure 48 the pressure device 9 can be opened by acting directly on the end of the hook 49 with a force H1 acting parallel to the bars 10 in a direction substantially orthogonal to the X axis.

Figure 49 shows a pressure device 9 which has in the joining end 11 a dimension in height Y much higher than the normal height of the bars 10, determined by an extension 53; this end 11 is constrained to a joint 12 obtained in the edge 3 of suitable dimensions for the height Y. This expedient makes the positioning of the presser 9 more precise and stable, especially when it is positioned close to the opening 8; in fact, if the measurement Y were small, the presser 9 during the closing phase would tend in the terminal part 13 to rotate upwards in an incorrect position. Moreover, this better axial positioning of the presser 9 in proximity to the opening 8 allows the use of hygienic protection lips T of smaller height dimensions.

In order to make the flattening of the duct 4 more regular and gradual in the axial direction of the duct 4 itself, the dimension in height Y can be extended to the whole of the presser 9 up to the end 13, or it can also be limited to a median area of the bars 10 by protuberances 54.

Also in this case the further joint 18 is present, which makes the closure stable even in the presence of pressure inside the container, since the presser 9 cannot in any way slide axially when it is closed.

It is evident that a container of this type, while supported in one hand, can be opened and closed easily by the same hand, without the danger of losing lids or other accessories.

Furthermore, when the presser 9 is released by applying pressure at the point H or HI, the bars 10 and the relative lips T automatically arrange themselves, due to the effect of elastic forces, in a position that does not interfere with the outflow of liquid, which makes the container is also very efficient from a hygienic point of view.

The pressure devices according to the invention, particularly the models shown in Figures 16, 25, 26, 27, 41, 42, 43 and 47 can be used in containers of the soft bag type.

Since the walls and the sealing edges of said bag containers have low rigidity, the pressers shown in Figures 16 and 43 lend themselves to being easily anchored to an edge of the said container by acting in sequence in the following way: - spreading the presser at the ends 13, with respect to its normal resting position, so that the gap G is widened,

- inserting the edge 3, 38 of the container inside the slot G thus opened,

- releasing the presser 9 in its normal position so that it locks on the edge 3, 38.

Also in this case the positioning of the presser 9 can be performed by the user but can also be done directly in the packaging plant.

It should be noted that, since the containers of the present invention are all of the collapsible wall type, a particularly wide opening is not necessary to allow the air to enter since the outflow can occur following a slight crushing on the walls of the container, in in this way the air must not enter the container during the outflow of the liquid.

This reduced opening from which the liquid comes out without gurgling is instead advantageous since it allows to better control the flow direction and to avoid any spillage.

Moreover, this characteristic of the collapsibility of the container can be advantageously exploited to favor the conservation of the residual liquid content, sealing the container itself without the presence of air inside.

It is also highlighted how the invention, particularly in the aspect concerning containers with thermoformed walls or with a floppy bag, can favor a wider field of use, in fact these containers are currently mainly relegated to a use where the contents are used only once. , such as: small containers with disposable doses of detergents or other, or refill doses for other types of more expensive containers.

For example, a thermoformed container with an outlet opening limited in size to a few millimeters and equipped with a closure device of the type shown in Figure 43, is very suitable to be used for all household liquid detergents, shampoos, etc., since opening and closing is very easy and quick even with gloves or slippery hands.

As already mentioned, for these containers 1 also a food use is not excluded since they are already originally equipped with a hygienic safety seal 5, 6, advantageously equipping them with the pressure device 9, 36 with lips T for hygienic protection.

The different pressure devices illustrated can also be combined in any different way: thus for example the device of Figure 29 or that of Figure 41 can have ends 13 with hooking of the type represented in Figures 5, 43, 47 and 48 or even any other known type coupling; or the pressing device of Figure 43 can have the hinge 11 like that of Figures 2, 3 or 23, 24 etc.

The hygienic protection with elastic lips T or with any other sealing system on the upper part of the bars 10 can also be applied to all the pressers 9, 19, 36 illustrated.

The pressure devices 9, 19, 36 can be produced by injection, or any other forming system, possibly connected to each other in an array, in the form of strips wound on reels or in the form of bars to allow maximum automation in the forming process and in the process of matching to the container.

Claims (102)

CLAIMS 1. Container (1) for fluid products, comprising a first wall (2) and a second wall (2) at least one of which is thermoformed and between which a cavity designed to contain said products is defined, said first wall (2) and said second wall (2) being welded into an edge (3), between said first wall (2) and said second wall (2) a duct (4) being also defined, intended to lead into an opening (8) of said container (1), said conduit (4) being closable by mutual contact of said first wall (2) and said second wall (2), characterized in that said conduit (4) cooperates with a pressure device (9, 19 , 36) which acts directly in a section which substantially crosses the whole of said duct (4) from side to side. Container (1) according to claim 1, characterized in that said section is substantially straight. Container (1) according to one or more of claims 1 or 2, characterized in that said pressure device (9, 19, 36) comprises a pair of bars (10) arranged in a "V" shape, hinged at the first ends ( 11), and equipped, in the second ends (13) opposite said first ends (11), with hooking means (M, 49) adapted to keep said second ends (13) mutually close to each other. 4. Container (1) according to one or more of claims 1 to 3, characterized in that at least one of said two bars (10) has, in the internal face (15) facing the other bar (2), a curved longitudinal conformation with convexity facing said other bar (2). 5. Container (1) according to claim 4, characterized in that at least one of said two bars (2) is elastically deformable, so that when said opposite ends (13) are approached, the inner faces (15) of said two bars (2) become substantially parallel. Container (1) according to one or more of claims 1 to 5, characterized in that, being in said presser (9, 19, 36) configured two internal faces (15) intended for contact with in said duct (4) , in a section according to a plane orthogonal to said portion, one of said two faces (15) has a rectilinear conformation and the other of said two faces (15) has a conformation with at least one projection (16). Container (1) according to one or more of claims 1 to 6, characterized in that said edge (3) has connection means (N, 12, 18, 28) adapted to keep said pressure device (9 , 19, 36). Container (1) according to claim 7, characterized in that said connection means (N, 12, 28) are intended to cooperate with said pressure device (9, 19, 36) so that said pressure device (9 , 19, 36) remains anchored to said container (1) even in the open state. Container (1) according to claim 7 or 8, characterized in that said connection means (N, 12, 18, 28) comprise a further interlocking means (18) intended to cooperate with said opposite ends (13) . Container (1) according to one or more of claims 3 to 9, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means (M, 49) are such as to allow the engagement of said opposite ends (13) by means of forces (A) acting in rotation with respect to said axis (X) and are such as to allow their release by means of forces (B) acting in a direction substantially parallel to said axis (X). Container (1) according to one or more of claims 3 to 9, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means (M, 49) are such as to allow the engagement of said opposite ends (13) by means of forces acting in rotation with respect to said axis (X) in a first radial position (C) and are such as to allow their release by means of forces acting in rotation with respect to said axis (X) in a second radial position (H) different from said first radial position (C). Container (1) according to claim 11, characterized in that said second radial position (H) is closer to said axis (X) than said first radial position (C). Container (1) according to one or more of claims 3 to 9, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means (M, 49) are such as to allow the engagement of said opposite ends (13) by means of forces (C) acting in rotation with respect to said axis (X) and are such as to allow their release by means of forces (HI) acting in a substantially orthogonal direction to said axis (X). Container (1) according to one or more of claims 1 to 13, characterized in that said pressure device (9, 19, 36) is a monobloc made of plastic material. Container (1) according to one or more of claims 1 to 14, characterized in that said pressure device (9, 36) is equipped with interlocking means (30) adapted to keep said opposite ends (13) apart from each other. ). Container (1) according to one or more of claims 3 to 15, characterized in that said bars (10) are equipped at the top with sealing means (T) able to act when said presser (9) is in the state Closed. Container (1) according to one or more of claims 3 to 16, characterized in that at least one of said bars (10) is equipped in the upper part with an elastic lip (T) intended for contact with the other bar (10) or to a respective elastic lip (T) of the other bar, when said presser (9) is in the closed state. Container (1) according to one or more of claims 1 to 17, characterized in that, at least in correspondence with said portion, the edges (3) being defined in a plane (P), the wall (2) is connected to said plane (P) with a radius of curvature (R) such that said wall (2) can assume a plane shape corresponding to said plane (P) by simple elastic deformation within its elastic limit; Container (1) according to claim 18, characterized in that since the thickness of the wall (2) is equal to S, said radius R of curvature is: R> 36S <2>, being R and S expressed in millimeters. 20. Container (1) according to one or more of claims 1 to 19, characterized in that, at least in correspondence with said section, said duct (4) has substantially flat and adjacent walls (2), being the opening (8) of said duct (4) obtainable by mutual separation of said walls (2) under elastic deformation. 21. Container (1) for fluid products, comprising a first wall (2) and a second wall (2) at least one of which is thermoformed and between which a cavity designed to contain said products is defined, said first wall (2) and said second wall (2) being coupled in a first joint (3) and in a second joint (27) which jointly circumscribe said cavity, at least the coupling in said second joint (27) being removable by peeling so as to define an opening (8) of said container (1), characterized in that said second joint (27) extends in a substantially straight section. Container (1) according to claim 21, characterized in that said opening (8) is determined by a deformation of said first wall (2) and by a symmetrical deformation of said second wall (2). 23. Container (1) according to claims 21 or 22, characterized in that in a median area of said second joint (27) there are respective appendages (28) of said first wall (2) and of said second wall (2 ). Container (1) according to claim 23, characterized in that said appendages (28) are spread apart. Container (1) according to one or more of claims 23 or 24, characterized in that said appendages (28) have enlargements (29) in the terminal part. 26. Container (1) according to one or more of claims 21 to 25, characterized in that it comprises a pressure device (9, 19, 36) acting at said second joint (27) adapted to restore the closure of said container (1) at said second joint (27). 27. Container (1) according to claim 26, characterized in that said pressure device (9, 19, 36) has grip areas (W, 24, 42, 45) suitable for engaging with said appendages (28, 29) so that with the widening of said pressing device (9, 19, 36) said peeling is made possible. 28. Container (1) according to one or more of claims 26 or 27, characterized in that said pressure device (9, 19, 36) consists of two bars (10) arranged in a "V" shape, hinged at the joining ends (11) and free to move in the opposite ends (13), and equipped with coupling means (M, 49) adapted to keep said opposite ends (13) mutually close to each other. 29. Container (1) according to one or more of claims 26 to 28, characterized in that at least one of said two bars (10) has, in the internal face (15) facing the other bar (10), a curved conformation with convexity facing said other bar (10). 30. Container (1) according to claim 29, characterized in that at least one of said two bars (10 is elastically deformable, so that when said opposite ends (13) are approached, the inner faces (15) of said two bars (10) become substantially parallel. 31. Container (1) according to one or more of claims 26 to 30, characterized in that, being in said presser (9, 19, 36) configured two internal faces (15) intended for contact with said first wall (2) and said second wall (2), in a section according to a plane orthogonal to said second joint, one of said two faces (15) has a rectilinear conformation and the other of said two faces (15) has a conformation with at least one projection (16 ). 32. Container (1) according to one or more of claims 26 to 31, characterized in that said edge (3) comprises connection means (12, 18, 28, 29) adapted to keep said pressure device (9 , 19, 36). 33. Container (1) according to claim 32, characterized in that said connection means (12, 18, 28, 29) comprise a further interlocking means (18) intended to cooperate with said opposite ends (13). Container (1) according to one or more of claims 27 to 32, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means (M, 49) are such as to allow the engagement of said opposite ends (13) by means of forces (A) acting in rotation with respect to said axis (X) and are such as to allow their release by means of forces (B) acting in a direction substantially parallel to said axis (X). Container (1) according to one or more of claims 28 to 33, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means (M, 49) are such as to allow the engagement of said opposite ends (13) by means of forces (C) acting in rotation with respect to said axis (X) in a first radial position (C) and are such as to allow their release by means of forces ( H) acting in rotation with respect to said axis (X) in a second radial position (H) different from said first radial position (C). Container (1) according to claim 35, characterized in that said second radial position (H) is closer to said axis (X) than said first radial position (C). 37. Container (1) according to one or more of claims 28 to 33, characterized by the fact that a rotation axis (X) being configured in said connecting end (11), said coupling means (M, 49) are such as to allow the engagement of said opposite ends (13) by means of forces (C) acting in rotation with respect to said axis (X) and are such as to allow their release by means of forces (HI) acting in a substantially orthogonal direction to said axis (X). 38. Container (1) according to one or more of claims 28 to 37, characterized by the fact that said pressing device (9, 36) is equipped with interlocking means (30) adapted to keep said opposite ends (13) apart from each other. ). 39. Container (1) according to one or more of claims 28 to 38, characterized by the fact that said barriers (10) are equipped at the top with sealing means (T) adapted to act when the detopressor (9) is in the state Closed. 40. Container (1) according to one or more of claims 28 to 39, characterized by the fact that at least one of said barriers (10) is equipped in the upper part with an elastic lip (T) intended for contact with the other bar (10) or to a respective elastic lip (T) of the other bar, when the said presser (9) is in the closed state. 41. Container (1, 35) for fluid products, comprising walls (2) between which a cavity designed to contain said products is defined, said walls being welded into an edge (3, 38) projected outwards of said products cavity, between said walls (2) being further defined a conduit (4) intended to lead into an opening (8) of said container (1, 35), characterized by this, which said edge (3, 38) has means ( N, 3a, 12, 18, 28, 29, 39) for holding devices (9, 19, 36) suitable for opening and / or closing said conduit (4) by reciprocal removal / approaching of said walls (2). 42. Container (1, 35) according to claim 41, characterized by that said holding means comprise recesses and / or protrusions (N, 3a, 12, 18, 28, 29, 39). 43. Container (1, 35) according to claims 41 or 42, characterized in that said holding means (N, 3a, 12, 18, 28, 29, 39) are undercut grooves (12, 18) obtained in the width of said edge (3, 38). 44. Container (1, 35) according to one of claims 41 to 43, characterized in that said holding means (N, 3a, 12, 18, 28, 29, 39) are grooves (N) parallel to said edge (3) and obtained in the thickness of said edge (3, 38). 45. Container (1, 35) according to one or more of claims 41 to 44, characterized in that being of the type made from folded cardboard (35), said means for retaining (N, 3a, 12, 18, 28 , 29, 39) are arranged in the median area intended to be opened by peeling. Container (1, 35) according to claim 45, characterized in that said holding means (N, 3a, 12, 18, 28, 29, 39) are spread apart tabs (39). 47. Container (1, 35) according to claim 46, characterized in that said means for holding (N, 3a, 12, 18, 28, 29, 39) are external portions (3a) not welded of said edge ( 3, 38). 48. Container (1, 35) according to claims 45 to 47, characterized in that said holding means (N, 3a, 12, 18, 28, 29, 39) are engaged with said pressure device (9, 36 ) so that by slowing down said pressure device (9, 36) it is possible to peel off said container (1, 35). 49. Container (1, 35) for fluid products comprising walls (2) welded into an edge (3, 38), said walls (2) being decoupled in said edge (3, 38) by peeling so as to form an opening (8) of said container (1, 35) and being coupled to determine the closure of said container (1, 35) by means of the aid of a pressure device (9, 19, 36), characterized in that said pressure device (9, 19, 36) comprises anchoring means (W, 24, 42, 45) to said walls (2) adapted to act to cause said peeling. 50. Container (1, 35) according to claim 49, characterized in that said anchoring means (W, 24, 42, 45) comprise joints (24, 42, 44, 45) for said walls (2) or for elements of said walls (2). 51. Container (1, 35) according to claim 50, characterized in that inside said joints (24, 42, 44, 45) there are ridges (45) suitable for penetrating into said walls (2) or in elements of said walls (2). 52. Container (1, 35) according to one or more of claims 49 to 51, characterized in that said anchoring means (24, 42, 44, 45) comprise bolts (42) passing through the thickness of said walls (2 ) or elements of said walls (2). 53. Container (1, 35) according to one or more of claims 49 to 52, characterized in that said anchoring means comprise areas welded to said walls or to elements of said walls. 54. Container (1, 35) according to one or more of claims 49 to 53, characterized in that said pressure device (9, 19, 36) consists of two bars (10) arranged in a "V" shape, hinged in the connecting ends (11) and free to move in the opposite ends (13), and equipped with hooking means (M, 49) adapted to keep said opposite ends (13) mutually close. 55. Container (1, 35) according to claim 54, characterized in that at least one of said two bars (10) has, in the internal face (15) facing the other bar (10), a curved shape with convexity facing said other bar (10). 56. Container (1, 35) according to claim 55, characterized in that at least one of said two bars (10) is elastically deformable, so that when said opposite ends (13) are approached the said internal faces (15) of said two bars (10) become substantially parallel. 57. Container (1, 35) according to one or more of claims 54 to 56, characterized in that, being in said presser (9, 19, 36) configured two internal faces (15) intended for contact with in said duct ( 4), in a section along a plane orthogonal to said portion, one of said two faces (15) has a rectilinear conformation and the other of said two faces (15) has a conformation with at least one projection (16). 58. Container (1, 35) according to one or more of claims 54 to 57, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means (M, 49 ) are such as to allow the engagement of said opposite ends (13) by means of forces (A) acting in rotation with respect to said axis (X) and are such as to allow their release by means of forces (B) acting in a substantially direction parallel to said axis (X). 59. Container (1, 35) according to one or more of claims 54 to 57, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means (M, 49 ) are such as to allow the engagement of said opposite ends (13) by means of forces (C) acting in rotation with respect to said axis (X) in a first radial position (C) and are such as to allow their release by means of forces (H) acting in rotation with respect to said axis (X) in a second radial position (H) different from said first radial position (C). 60. Container (1, 35) according to claim 59, characterized in that said second radial position (H) is closer to said axis (X) than said first radial position (C). 61. Container (1, 35) according to one or more of claims 54 to 57, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means (M, 49 ) are such as to allow the engagement of said opposite ends (13) by means of forces (C) acting in rotation with respect to said axis (X) and are such as to allow their release by means of forces (HI) acting in a substantially direction orthogonal to said axis (X). 62. Container (1, 35) according to one or more of claims 54 to 61, characterized in that said pressure device (9, 19, 36) is a monobloc made of plastic material. 63. Container (1, 35) according to one or more of claims 54 to 62, characterized in that said pressure device (9, 19, 36) is equipped with interlocking means (30) adapted to keep said opposite ends (13). 64. Container (1, 35) according to one or more of claims 54 to 63, characterized in that said bars (10) are equipped at the top with sealing means (T) adapted to act when said presser (9, 19 , 36) is in the closed state. 65. Container (1, 35) according to one or more of claims 54 to 64, characterized in that at least one of said bars (10) is equipped in the upper part with an elastic lip (T) intended for contact with the another bar (10) or to a respective elastic lip (T) of the other bar (10), when said presser (9, 19, 36) is in the closed state. 66. Container (1, 35) according to one or more of claims 49 to 65, characterized in that it is of the parallelepiped-shaped cardboard type with flap (40) folded on one side and where said pressure device (9, 19, 36) is set up in the operative position. 67. Container (1, 35) according to one or more of claims 49 to 65, characterized in that it is of the parallelepiped-shaped cardboard type with flap (40) folded on one side and with said pressure device (9, 19 , 36) attached to said container (1, 35) in an inoperative position. 68. Container (1, 35) according to claim 67, characterized in that said pressure device (9, 19, 36) is glued to a wall of said container (1, 35). 69. Container (1, 35) obtained from a sheet of folded cardboard and welded in an edge (3, 38), characterized in that it has attached a pressure device (9, 19, 36) comprising a pair of bars arranged in a " V ", hinged near the joining ends (11) and free to move in the opposite ends (13), characterized by the fact that said bars (10) comprise coupling means (M, 49) able to keep said bars close together opposite ends (13). 70. Container (1, 35) according to claim 69, characterized in that said pressure device (9, 19, 36) is anchored to a wall of said container (1, 35) in an inoperative position. 71. Container (1, 35) according to claim 70, characterized in that, being said container (1, 35) of parallelepiped shape, said pressure device (9, 19, 36) is anchored to said container (1, 35 ) in an operational position. 72. Container (1, 35) according to claim 71, characterized in that said pressure device (9, 19, 36) is anchored on said edge (3, 38) of a flap (40) folded onto a side wall. 73. Method for opening and / or closing a container (1, 35) for fluid products comprising walls (2, 35) welded into an edge (3, 38), said walls (2, 35) being decoupled in said edge (2 , 35) by peeling so as to form an opening (8, 47) of said container (1, 35), said opening (8, 47) cooperating with pressure devices (9, 19, 36) suitable for closing said opening (8, 47), characterized in that it comprises acting with said pressing devices (9, 19, 36) to cause said peeling. 74. Method according to claim 73, characterized in that said action comprises opening bars (10) arranged in a "V" shape of a pressure device (9, 19, 36). 75. Pressing device (9, 19, 36)., Suitable for closing a container (1, 35) with flexible walls, comprising a pair of bars (10) arranged in a "V" shape, hinged near the joining ends ( 11) and free to move in the opposite ends (13), characterized in that said bars (10) comprise hooking means (M, 49) adapted to keep said opposite ends (13) mutually close to each other. 76. Pressing device (9, 19, 36) according to claim 75, characterized in that said hooking means (M, 49) are an integral part of said bars (10). 77. Pressing device (9, 19, 36) according to one or more of claims 74 to 75, characterized in that at least one of said two bars (10) has, in the internal face (15) facing the other bar (10), a curved conformation with convexity facing said other bar (10). 78. Pressing device (9, 19, 36) according to one or more of claims 75 to 77, characterized in that at least one of said two bars (10) is elastically deformable, so that when said opposite ends (13) are approached, the internal faces (15) of said two bars (10) become substantially parallel. 79. Pressing device (9, 19, 36) according to one or more of claims 75 to 78, characterized in that in a section along a plane transversal to said bars (10), the inner face (15) of one of the said bars (10) has a rectilinear conformation and the internal face (15) of the other bar (10) has a conformation with at least one projection (16). 80. Pressing device (9, 19, 36) according to claim 79, characterized in that said at least one projection (16) is substantially present along the entire active length of said bar (10). 81. Pressing device (9, 19, 36) according to one or more of claims 75 to 80, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means ( M, 49) are such as to allow the engagement of said opposite ends (13) by means of forces (A) acting in rotation with respect to said axis (X) and are such as to allow their release by means of forces (B) acting in a direction substantially parallel to said axis (X). 82. Pressing device (9, 19, 36) according to one or more of claims 75 to 80, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means ( M, 49) are such as to allow the engagement of said opposite ends (13) by means of forces (C) acting in rotation with respect to said axis (X) in a first radial position (C) and are such as to allow their release by means of forces (H) acting in rotation with respect to said axis (X) in a second radial position (H) different from said first radial position (C). 83. Pressing device (9, 19, 36) according to claim 82, characterized in that said second radial position (H) is closer to said axis (X) than said first radial position (C). 84. Pressing device (9, 19, 36) according to one or more of claims 75 to 80, characterized in that a rotation axis (X) being configured in said connecting end (11), said coupling means ( M, 49) are such as to allow the engagement of said opposite ends (13) by means of forces (C) acting in rotation with respect to said axis (X) and are such as to allow their release by means of forces (HI) acting in a direction substantially orthogonal to said axis (X). 85. Pressing device (9, 19, 36) according to one or more of claims 75 to 84, characterized in that said pressing device (9, 19, 36) is a monobloc made of plastic material. 86. Pressing device (9, 19, 36) according to one or more of claims 75 to 85, characterized in that said pressing device (9, 19, 36) is equipped with interlocking means (30) adapted to mutually maintain remove the said opposite ends (13). 87. Pressing device (9, 19, 36) according to one or more of claims 75 to 86, characterized in that said bars (10), in an approximately median area of their length, are equipped with anchoring means (W , 24, 42, 44, 45) for said flexible walls (2, 35). 88. Pressing device (9, 19, 36) according to one or more of claims 75 to 87, characterized in that, being configured an axis of symmetry (K) arranged on the plane formed by the median axes (DI) of the two bars ( 10), the conjunction (11) of said bars (10) is in said axis of symmetry (K). 89. Pressing device (9, 19, 36) according to one or more of claims 75 to 87, characterized in that, being configured an axis of symmetry (K) arranged on the plane formed by the median axes (DI) of the two bars ( 10), the joining material of said bars (10) is not in said axis of symmetry (K). 90. Pressing device (9, 19, 36) according to one or more of claims 75 to 89, characterized in that said bars (10) are hinged to the respective branches of an inverted U-shaped element (33). 91. Pressing device (9, 19, 36) according to claim 90, characterized in that in the internal walls, said inverted U-shaped element (33) has longitudinal protrusions (34) with sawtooth. 92. Pressing device (9, 19, 36) according to one or more of claims 90 to 91, characterized in that with reference to the base (D) of said inverted U-shaped element (33) conventionally arranged on a horizontal plane , the plane D1 defined by the median axes of said bars (10) is angled downwards by an angle (Z) of at least 15 °. 93. Pressing device (9, 19, 36) according to claim 92, characterized in that said angle (Z) is about 30 °. 94. Pressing device (9, 19, 36) according to one or more of claims 90 to 93, characterized in that said inverted U-shaped element (33) is developed in length by a measure (L) at least equal to half of the length of a said bar (10). 95. Pressing device (9, 19, 36) according to one or more of claims 75 to 94, characterized in that it has an elastically expandable slot (G) so as to be stably clamped to the edge (3, 38) of a soft-walled container (1, 35). 96. Pressing device (9, 19, 36) according to one or more of claims 75 to 95, characterized in that it has an axial profile with a constant section such as to allow it to be formed by extrusion. 97. Pressing device (9, 19, 36) according to one or more of claims 75 to 96, characterized in that said bars (10) are equipped at the top with sealing means (T) adapted to act when said presser ( 9, 19, 36) is in the closed state on a container (1, 35). 98. Pressing device (9, 19, 36) according to one or more of claims 75 to 97, characterized in that at least one of said bars (10) is equipped in the upper part with an elastic lip (T) intended for contact with the other bar (10) or to a respective elastic lip (T) of the other bar (10), when said presser (9, 19, 36) is in the closed state on a container (1, 35). 99. Pressing device (9, 19, 36) according to one or more of claims 75 to 98, characterized in that at the joining ends (11) said pressing device (9, 19, 36) is equipped with a extension (53) substantially orthogonal to said bars (10). 100. Pressing device (9, 19, 36) according to one or more of claims 75 to 99, characterized in that in correspondence with an approximately median zone, said bars (10) are provided with protuberances (54). 101. Method for opening a container of the type comprising a first wall (2) and a second wall (2) at least one of which is thermoformed and between which a cavity intended to contain a fluid product is defined, said first wall (2) and said second wall (2) being coupled in a first joint (3) and in a second joint (27) which together circumscribe said cavity, said second joint (27) being developed in a substantially straight section, at least the coupling in said second joint (27) being removable by peeling so as to define an opening (8) of said container, characterized by this, which comprises symmetrically bending said first wall (2) and said second wall (2) in correspondence with said second joint (27). 102. A method according to claim 101, characterized in that said bending comprises bending around axes substantially parallel to the longitudinal axis of said opening (8).