SK287003B6 - A container having pressure responsive panels - Google Patents

Abstract

A container (1) suitable for containing liquid and having at least one controlled deflection flex panel (3) for accommodating pressure change induced in the container (1), wherein the flex panel (3) has longitudinal and transverse extents defining a plane of the flex panel (3) having a flexure region (5) projecting away from plane, that in the flex panel (3) has a flexure initiator region (8) positioned longitudinally away from said flexure region (5), said flexure initiator region (8) having a lesser amount of arc projecting away from said plane than said flexure region (5). Both regions (5,8) merging longitudinally within the flex panel (3) with the amount of arc progressively increasing from said initiator region (8) to said flexure region (5) so that said initiator region (8) can flex inwardly relative to said plane and wherein in response to pressure changes the amount of arc changes and causes said flexure region (5) to progressively reduce I said amount of arc in response to increasing pressure change in the container (1).

Description

Technical field

The invention relates to a vessel with pressure-adaptable plates, in particular a polyester vessel which can be filled with hot liquid and an improved wall construction of the vessel.

BACKGROUND OF THE INVENTION

During the filling with hot liquid, the construction of the vessel is subject to a considerable and complex mechanical stress due to the thermal stress, the hydraulic pressure during filling and immediately after closing and the vacuum during cooling of the liquid.

The thermal stress acts on the vessel walls when pouring hot liquid. Due to the hot liquid, the vessel walls soften and then shrink unevenly, causing the vessel to deform. Therefore, the polyester must be heat treated for molecular change purposes to produce a vessel with thermal stability.

Pressure and stress are applied to the side walls of the heat-resistant container during filling and also for a considerable time thereafter. When the container is filled with hot liquid and closed, it is subject to initial hydraulic pressure and increased internal pressure. When cooling the liquid and air in the space below the closure, this thermal reduction in volume results in a partial exhaustion of air from the vessel. The vacuum generated as a result of cooling tends to mechanically deform the vessel walls.

Application no. No. 5,178,290 discloses a notch intended to strengthen slab surfaces.

Akiho Ota et al. U.S. Pat. 5238129 encapsulates another reinforcement structure with circular ribs, which in this case extend horizontally in strips above, below and outside the plate surface of the hot-filled bottle.

In addition to the need to reinforce the vessel against thermal stress and vacuum, there is a need to cope with the initial hydraulic pressure and increased internal pressure exerted on the vessel by pouring hot liquid and then closing the lid. Thereby pressure is applied to the side wall of the container. The heat plates will be pushed outwards, which may cause the vessel to deform.

Hyashi et al. U.S. Pat. No. 4,877,141 discloses a plate construction that conforms to an initial natural outward curvature due to internal hydraulic pressure and temperature, followed by inward curvature due to the underpressure generated by cooling. It is important to maintain the relatively flat profile of the plate, but with a slight displacement of the central portion to strengthen the plate, but which does not prevent the plate from moving radially inwards or outwards. However, since the board is generally flat, the range of movement in both directions is limited. It does not include plate fins that would increase flexibility, as these would impede the external and internal reverse movement of the plate as a whole.

Krishnakumar et al. U.S. Pat. No. 5908128 discloses another flexible plate to respond to hydraulic pressure and forces induced by the temperature after filling. A relatively conventional design of a container for filling with hot liquid, in particular a container suitable for pasteurization, is described. The claims define that in the pasteurization process it is not necessary to prepare the container for heat before filling, since a cold liquid is introduced which is heated only after closing the lid. Concave plates are used to compensate for pressure changes. To provide flexibility in a radial outward direction of movement followed by a radially inward movement, the plates are kept in a shallow fold inward to accommodate the variable internal pressure and temperature during the pasteurization process. Increasing the closure temperature, which is maintained for a certain period of time, causes the plastic material to soften, thereby giving the plates a curved inward direction more flexibility in the application of force. However, it was found that too much curvature would prevent this. Permanent deformation of the plates when deflected by force in the opposite direction is prevented by adjusting the shallow deflection and softening the material under the influence of heat. The magnitude of the force transmitted to the walls of the vessel is therefore determined again based on the degree of possible bending of the plates, as is the case with a standard hot-water bottle. However, the degree of deflection is limited because it is necessary to maintain a shallow curvature of the radial profile of the plates. Thus, the construction of the bottle is described by various standard methods.

Krishnakumar et al. U.S. Pat. 5303834 shows additional flexible plates that can be moved from a convex to a concave position by forming a "shrinkable" container. The vacuum itself cannot reverse the position of the plates, but the plates can be turned manually. When the compressive force is released, the plates will automatically return to their original shape because a large force must be applied to maintain the inverted position, which must be held manually. Permanent plate deformation caused by initial convex deflection can be prevented by using a group of longitudinal bend points.

Krishnakumar et al. U.S. Pat. No. 5971184 shows further "flexible" plates that can be moved from the first convex position to the second concave position according to the claims by forming a bottle that can be gripped by hand with two large flat side walls. Each plate includes a notched central portion that can be inverted in the opposite position. Containers of this type differ in the two large flat opposite walls of the vacuum stability of the hot-filled containers which have

SK 287003 Β6 may maintain a generally cylindrical shape under negative pressure. A larger suction causes the side wall to be enlarged, which is thicker into the concave shape than with smaller plates than with a standard six-plate construction on a predominantly cylindrical container. Due to the design of the container, the force applied to each of the two plates increases, thereby also the bending force.

Nevertheless, it is still necessary to maintain the convex region of the plates in a relatively flat shape, otherwise it would not be possible to draw the plate into the desired concave boiling by vacuum. The need to maintain a shallow concave deflection allowing sufficient flexibility has previously been described by Krishnakumar et al. U.S. Pat. No. 5,338,334 and U.S. Pat. No. 5,908,128. This, in turn, limits the amount of vacuum that is released before the walls of the container are subject to tension. Furthermore, it is generally considered impossible for a shape that is convex in the longitudinal and horizontal planes to be reversed in any way unless the convex curvature is reasonably shallow. Further, when the vacuum is released by removing the closure, the plates cannot return to their original convex position as long as they have some significant convex deflection. At best, the plate deforms under the force and remains in the new inverted position. The plate will no longer be able to be reversed in the opposite direction, as the effect of the heat of the liquid on the softening of the material will cease and the amount of ambient pressure will not be sufficient to do so. Neither will the shape memory by which the plastic was marked before it "collapsed" into a concave position. Krishnakumar et al. U.S. Pat. 5908128 previously described the formation of longitudinal ribs to prevent this permanent deformation that occurs when the plates are bent from a convex position to a concave. The same finding regarding irreversible deformation was reported by Krishnakumar et al. also in U.S. Pat. No. 5,238,334. Hayashi et al. U.S. Pat. 4877141 also shows that if the plates are to be folded against their natural curvature, they must be kept relatively flat.

As a fundamental principle of prior art container failure, the applicant considers the irreversible deformation of the container structure due to the weak design under the effect of the container vacuum, especially when the weight of the container is reduced to gain a competitive advantage on the market.

The invention, on the other hand, allows for greater bending of the side walls to which the negative pressure is applied so that the pressure exerted on the container can be more easily adapted. Here again, the described reinforced ribs of various types and locations can be used to compensate for any unnecessary excess pressure due to ambient forces that would bend the vessel walls to a new " matched pressure " shape.

SUMMARY OF THE INVENTION

It is therefore an object of the invention to eliminate or at least alleviate these problems with currently available containers, or at least to offer users a choice.

Other objects of the invention may be apparent from the following description.

SUMMARY OF THE INVENTION The present invention provides a liquid-filled container comprising at least one resilient panel with controlled deflection to counteract pressure changes induced in the container, wherein the longitudinal and transverse dimensions defining the surface of the resilient panel are relative to the longitudinal axis of the container and the resilient panel has an adaptive area extending therefrom; characterized in that the flexible panel has an adaptive initiation region extending longitudinally from the adaptive region, wherein the convexity of the adaptive initiation region is less than the convexity of the adaptive region and both regions coincide longitudinally with the flexible panel in curvature gradually increasing from the adaptive initiation region to the adaptive region that the adaptive initiation region can be folded in and where, in response to pressure changes, the deflection rate changes and causes a gradual reduction in the deflection rate of the adaptive region in response to the increasing change at the vessel pressure.

Preferably, the adaptable region extends externally in a transverse direction with respect to the longitudinal axis of the container.

Advantageously, the folding of the adaptive region results in a reduction in the external curvature of its external camber.

Preferably, the adaptive region has an outwardly directed curvature which continuously passes into the adaptive region.

Preferably, the adaptive initiation region has an inwardly directed curvature that continuously flows into the adaptive region.

Preferably, the extent of the arch of the surface varies along the axis of the container.

Preferably, the adaptive initiation region varies in a transversely diverging range along the longitudinal axis of the container.

Preferably, the adaptable region varies in a transversely diverging range along the longitudinal axis of the container.

Preferably, the adaptive initiation region is reversed by reversing its curvature in response to a vacuum change within the vessel.

Preferably, the adaptive region is reversed by reversing its curvature in response to a vacuum change within the container.

SK 287003-6

Preferably, the container is adapted to be filled with liquid at a temperature higher than room temperature, wherein the resilient panel is adapted to reverse the convexity after changing the internal pressure during the temperature change of the liquid, the adaptive initiation region being adapted to reverse relative to its convexity. causes the curvature of the adaptive region to be reversed with respect to the curvature direction thereof.

Preferably, the resilient panel is adapted to deflect inwardly after the internal pressure has dropped during liquid cooling. Preferably, the deflection is outwardly relative to the surface.

Preferably, the flexible panel is adapted to flex outwardly in use after the internal pressure has increased during heating of the liquid. Preferably, the deflection is inwardly with respect to the surface.

Preferably, the container comprises a plurality of flexible panels spaced apart about its longitudinal axis.

Preferably, each resilient panel comprises at least one central adaptive initiation region and a pair of resilient regions extending from the adaptive initiation region toward the opposite longitudinal ends of the resilient panel.

Preferably, the adaptive initiation region is located closer to the center of the flexible panel having first and second adaptive regions extending longitudinally away from the adaptive initiation region, wherein the first adaptive region extends toward one end of the elastic panel and the second adaptive region extends toward the opposite end of the elastic panel. panel.

Preferably, the vessel is adapted to be filled with liquid at a temperature above room temperature, with the adaptive initiation region and / or the adaptive region having a bulge that varies in a transverse diverging direction along the axis of the vessel.

Preferably, the container has a pair of substantially inflexible regions between which the adaptive initiation region and the adaptive region are guided, wherein the flattened region extends between the inflexible regions to form an end of the adaptive initiation region.

Preferably, the adaptive initiation region and / or the adaptive region meet at the top and provide a flexible panel made in two parts.

Preferably, the adaptive region is positioned in the direction of one longitudinal end of the flexible panel and the adaptive initiation region is positioned in the direction of the opposite end of the flexible panel.

Preferably, the adaptive initiation region extends from the surface to a lesser extent than the adaptive region.

Preferably, the adaptive initiation region is located closer to one longitudinal end of the flexible panel than the adaptive region.

Other aspects of the invention may be apparent from the following description, which is given by way of example only and in which reference is made to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows a front view of a container according to one possible embodiment of the invention.

Figure 2a shows a front view of the panel surface of the container of Figure 1.

Figure 2b shows a side view of the panel surface of Figure 2a.

Figure 3 shows a side view of the inverted face of the panel of Figure 2a.

Figures 4a-c schematically show a cross-section of the container of Figure 1 sequentially along lines A-C, unless the panel faces are inverted.

Figures 5a-c schematically show cross-sections of the container of Figure 1 sequentially along lines A-C when the panel faces are reversed.

Figures 6a-c show front and rear views of another embodiment of a panel surface.

Figure 7a shows a front view of another embodiment of a panel surface.

Figures 7b, c show side views of the panel surface of figure 7a in an inverted and inverted position.

Figure 8a shows a front view of another embodiment of a panel surface.

Figures 8b-d show side views of the panel surface of Figure 8a in an inverted, partially inverted and inverted position.

Figures 9a-c and figures d-f show schematic cross-sections taken sequentially along lines corresponding to letters A-C of the container of Figure 1 having a different panel surface in the inverted and inverted position.

DETAILED DESCRIPTION OF THE INVENTION

In Figure 1, according to a preferred embodiment of the invention, the container, generally designated 1, has a main side wall 2 of generally cylindrical shape.

The container 1 is capable of adapting to pressure and, in particular, a container for filling with a hot liquid intended to be filled with a liquid having a temperature higher than room temperature. The container 1 may be formed in a folded form

286 of polyester or other plastics, eg. heat treated polyethylene terephthalate (PET). The lower part of the side wall 2 comprises a plurality of vertically oriented longitudinally depressurized elastic panels 3 which are disposed along the perimeter of the container, separated from each other by the smooth longitudinal flat regions 4. Each panel may be generally rectangular in shape and adapted to be hot when the container is filled. liquid, closing the container and then cooling the liquid to the inside. During the process, the vacuum flexible panels 3 behave so as to compensate for the vacuum caused by the filling with hot liquid.

In Figure 2a, the vacuum flexible panel 3 of the container 1 is shown. The vacuum flexible panel 3 comprises at least one connection region 7 that connects the adaptive region 5 with the flat regions 4. The adaptive region 5 comprises an adaptive initiation region 8 that controls the connection of the adaptive region 5 and the connecting region 7. Preferably, the connecting region 7 can be folded in relatively easily under the influence of a vacuum, and the adaptive initiation region 8 will deflect the adaptive region 5 by reversing and subsequently folding inwards. Thus, a much larger volume of vacuum spring panels 3 will be exhausted than with prior art spring panels. Thereafter, the vacuum is reduced substantially more than in the case of prior art containers, and the container walls will therefore be subject to a substantially lower pressure.

The connecting region 7 preferably allows to adjust the radius from the center of the container 1 to the edge of the flexible panel 3 (inside the connecting region 7) independently of the radius at the edge of the flat regions 4 (the outer boundary around the connecting region 7). Thus, the connecting region 7 will allow for the independent addition of the flat region 4 on the one hand and the addition of the flexible panel 3 and its optimization for deflection on the other hand. The connecting area 7 compensates for all circumferential differences in radius between the two structures.

The boundary 8A between the adaptation initiation region 8 and the remainder of the adaptation region 5 is shown as being strongly arched in the circumferential direction of the flexible panel 3.

The degree of arcuate deflection or projection of the adaptive initiation region 8 with respect to the plane defined by the median longitudinal axis of the container is substantially smaller than the size of the arc or projection of the adaptive region 5, which causes greater sensitivity to vacuum. The adaptive initiator region 8 further comprises an initiator element end 9 which is predominantly flat and is therefore most sensitive to negative pressure. Thus, when the container 1 is subjected to a negative pressure, the vacuum spring panel 3 may bend at the end 9, followed by a deflection and reversal of the entire adaptive initiation region 8, and then the reversal of the adaptive region 5 will proceed. element concave. In this embodiment, however, the projection of the concave region relative to the plane defined by the median longitudinal axis of the container will be smaller than the projection of the remainder of the adaptive region 5.

Importantly, in response to a gradual reduction in the volume of the vessel 1 during cooling, the reversal of the adaptive region 5 may continue to be uniformly continued. This is in contrast to the plate that "collapses" between the two states. Due to the gradual deflection of the adaptive region 5 to the inverted position and from the inverted position in response to a relatively small pressure difference compared to the plates that "collapse", less force will be transmitted to the side walls of the container 1. This makes it possible to use a smaller amount of material in the construction of the container and thus to reduce production. As a result, fewer load failures can be expected for the same amount of material.

Moreover, the reduced pressure difference required to reverse the adaptive region 5 allows a larger number of flexible panels 3 to be contained in a single container 1. The flexible panel 3 may also not be large, since low vacuum is sufficient to deflect the panel. Thus, the flexible panels 3 need not be large, nor does it need to reduce their number in the container, allowing greater flexibility in the construction of the container.

Figure 2b shows a section along line DD of Figure 2a. The flexible panel 3 is shown with the adaptive region 5 in the inverted position, with a dashed line indicating the boundary of the adaptive region 5 with the connection region 7. In a preferred embodiment of the invention, the adaptive region 5 is predominantly arched in radially outward or transverse direction as shown. The connecting area 7 is predominantly U-shaped, where the relative height of the sides of the "U" determines the relative radius where the flat area 4 and the adaptive area 5 are located. The ending 9 is most sensitive to vacuum as it extends to the smallest extent. j. has the smallest arc of the adaptive area 5.

Figure 3 shows a flexible panel 3 with an adaptive region 5 that is reversed as a result of the vacuum. The end 9 and the adaptive initiation region 8 are first deflected and inverted so that the adjacent surface of the adaptive region 5 is pulled inwards. This continues along the adaptation region 5 until the adaptation region is completely reversed, as shown by the line mark of the projecting region 5b. The dotted line in Figure 3 shows the edge of the adaptive area 5 and the dashed line 5a shows the position of the adaptive area 5 when not reversed.

Importantly, when the vacuum is removed from the container after removal of the closure, the resilient panel 3 may leave the position it has assumed due to the vacuum and return to its original shape. This can be assisted by uniformly increasing the arc curvature from one end of the adaptive region 5 to the other, the arc of curvature gradually increasing from the adaptive initiating region 8. Alternatively, the effective area 5 may have a substantially constant increase. When the pressure is released, the adaptive initiation region 8 induces a transverse movement of the flexible panel 3 in a curved inward direction, which begins by reversing the adaptive initiation region 8, followed by an increased adaptive region 5 without causing it to be irreversibly deflected. The vacuum spring panel 3 can be repeatedly inverted without significant permanent deformation.

Figures 4a-c show cross-sections of the container 1 of Figure 1 taken along lines AA, BB and CC with the adaptive region 5 in the inverted position. In this preferred embodiment, the adaptive region 5 protrudes increasingly outwardly from the region with the adaptive initiation region 8.

Figures 5a-c show cross-sections of the container 1 taken along lines AA, BB and CC with the adaptive region 5 in the fully inverted position 5b due to the applied vacuum. The area of the adaptive region 5 along the line AA is deflected to a relatively large extent compared to the region of the nearer region of the adaptive initiation region 8. The dotted lines 5a in Figures 5a-c indicate the position of the adaptive regions 5 without applying vacuum.

Figure 6a shows a front view of another embodiment of the resilient panel 30 with an adaptive initiation region 80 and a flattened region 90. The connecting region 70 of the resilient panel 30 is a planar element that surrounds the resilient region 50. Figure 6b illustrates the resilient panel 30 without applying negative pressure. The adaptive region 50 has a predominantly still arched curvature from the adaptive initiation region 80 in the direction of the arrow 6. Figure 6c shows the resilient panel 30 with the adaptive region 50 in the fully inverted position due to the application of vacuum.

Figure 7a shows a front view of another embodiment of the flexible panel 300. The flexible panel 300 comprises two adaptive regions 500 positioned side by side. The adaptive initiation region 800 is located in two directions from the central end of the initiation region 900. In this embodiment, the center of the flexible panel 300 is most sensitive to deflection under the influence of vacuum and thus deflects first. Figures 7b and 7c show successively the flexible panels 300 without applying a vacuum and in a fully inverted position.

The dotted line 800a shows the arc deflection boundary between the adaptation initiation region 800 and the remainder of the adaptation region 500.

Figure 8a shows a front view of another embodiment of a flexible panel indicated generally by an arrow 300 '. The flexible panel 300 'comprises two adaptive regions 500' and 500 positioned side by side with respective adaptive initiation regions 800 'with a centrally flattened region 900' between them. However, unlike the flexible panel 300, the conventional position of one of the adaptive regions 500 is concave and not convex (see FIG. 8b). By applying hydraulic pressure, the concave adaptive region 500 is inverted in the direction shown by the arrow 6a (see FIG. 8c), thereby reducing the pressure on the flat regions 4 between adjacent spring panels 300 '. Once the liquid has cooled, the vacuum causes the two adaptation regions 500 'and 500 to reverse in the direction of the arrow 6B (see FIG. 8d).

It is valuable that the profile and / or construction of the flexible panels can be varied. As shown e.g. 9, the container 1 may have flexible panels with adaptive regions 5 'including two planar regions 10 which meet at the top 11 so as to form a rectangular plate, thus not a curved plate. Figures 9a-c show cross-sections through lines AA, BB and CC of the container 1 of Figure 1 with adaptable regions 5 '. Figures 9d-f show inverted positions of the adaptive regions 5 'of Figures 9a-c, with solid lines 5'b showing inverted position and dotted lines 5'a showing pre-invert position. In addition or otherwise, the elastic panels 3 of all embodiments can be positioned transversely with respect to the longitudinal axis of the container 1, i.e. not vertically, as shown e.g. Figure 1.

Thus, a vessel is adapted to accommodate pressure, comprising resilient plates which allow for a large change in the volume and thus of the contents of the vessel, thereby reducing the pressure applied to the walls. As a result, less material is required to maintain the integrity of the container, making it less expensive to manufacture.

Where reference has been made in the preceding description to particular parts or components of the invention to which known equivalents exist, then these equivalents are also included as if they were specifically defined.

Although the invention has been described by way of example and with reference to possible embodiments, it is to be understood that modifications or improvements may be made therein without departing from the scope of the invention as defined in the appended claims.

Claims (24)

PATENT CLAIMS Container suitable for liquid filling comprises at least one flexible panel (3) with controlled deflection for compensating for pressure changes induced in the container (1), wherein the longitudinal and transverse dimensions defining the surface of the flexible panel (3) are relative to the longitudinal axis of the container (1) and the flexible panel (3) has an adaptive region (5) extending from its surface, characterized in that the flexible panel (3) has an An initiation region (8) extending longitudinally from the adaptation region (5), wherein the convexity of the adaptive initiation region (8) is smaller than the convexity of the adaptation region (5) and both regions (5,8) coincide longitudinally with the flexible panel (3) in a curvature gradually increasing from the adaptive initiation region (8) to the adaptive region (5) so that the adaptive initiation region (8) can bend inwardly and where in response to pressure changes the deflection rate changes and causes the deflection rate of the adaptive region ( 5) in response to an increasing pressure change in the vessel (1). Container according to claim 1, characterized in that the adaptive region (5) extends externally in a transverse direction with respect to the longitudinal axis of the container (1). Container according to claim 1 or 2, characterized in that the bending of the adaptive region (5) results in a reduction in the external curvature of its external arch. Container according to claim 1, 2 or 3, characterized in that the adaptive region (8) has an outwardly directed curvature which continuously passes into the adaptive region (5). Container according to claim 1, 2 or 3, characterized in that the adaptive initiation region (8) has an inwardly directed curvature which continuously passes into the adaptive region (5). Container according to claim 1, characterized in that the extent of the arch of the surface varies along the axis of the container (1). Container according to claim 1, characterized in that the adaptive initiation region (8) varies in a transversely diverging range along the longitudinal axis of the container (1). Container according to claim 7, characterized in that the adaptive region (5) varies in a transversely diverging range along the longitudinal axis of the container (1). Container according to claim 7, characterized in that the adaptive initiation region (8) is reversed by reversing its curvature in response to a vacuum change inside the container (1). Container according to claim 9, characterized in that the adaptive region (5) is reversed so that its curvature is reversed in response to a vacuum change inside the container (1). Container according to claim 1, wherein the container (1) is adapted to be filled with a liquid at a temperature higher than room temperature, wherein the flexible panel (3) is adapted to oppositely arch after a change in internal pressure during the liquid temperature change, that the adaptive initiation region (8) is adapted to be reversed with respect to its camber direction, thereby causing the camber of the adaptive region (5) to be reversed with respect to its camber direction. Container according to claim 11, characterized in that the flexible panel (3) is adapted to deflect inwardly after the internal pressure has dropped during liquid cooling. Container according to claim 11 or 12, characterized in that the deflection is outwardly relative to the surface, Container according to claim 13, characterized in that the flexible panel (3) is adapted to flex outwardly in use after the internal pressure has increased during heating of the liquid. Container according to claim 11, characterized in that the deflection is inwardly with respect to the surface. Container according to claim 11, characterized in that it comprises a plurality of flexible panels (3) spaced around its longitudinal axis. Container according to claim 11, characterized in that each flexible panel (3) comprises at least one central adaptive initiation region (8) and a pair of adaptive regions (5) extending from the adaptive initiation region (8) towards opposite longitudinal ends of the flexible panel (3). Container according to claim 1, characterized in that the adaptive initiation region (8) is located closer to the center of the flexible panel (3) having first and second adaptive regions (5) extending longitudinally away from the adaptive initiation region (8), a first adaptive region (5) extending towards one end of the flexible panel (3) and a second adaptive region extending towards the opposite end of the flexible panel (3). Container according to claim 18, adapted to be filled with a liquid at a temperature above room temperature, characterized in that the adaptive initiation region (8) and / or the adaptive region (5) has a bulge which varies in transverse diverging direction along the axis of the vessel (1). Container according to claim 19, characterized in that it has a pair of substantially inflexible regions between which an adaptive initiation region (8) and an adaptive region (5) are guided, wherein the flattened region (900 ') extends between the inflexible regions to form completion of the adaptive initiation area (8). Container according to claim 1, characterized in that the adaptive initiation region (8) and / or the adaptive region (5) meeting at the top (11) provide a flexible panel (3) made in two parts. Container according to claim 1, characterized in that the adaptive region (5) is positioned in the direction of one longitudinal end of the flexible panel (3) and the adaptive initiation region (8) is positioned in the direction of the opposite end of the flexible panel (3). Container according to claim 1, characterized in that the adaptive initiation region (8) protrudes from the surface to a lesser extent than the adaptive region (5). Container according to claim 1, characterized in that the adaptive initiation region (8) is positioned closer to one longitudinal end of the flexible panel (3) than the adaptive region (5).