SK12182001A3 - A container having pressure responsive panels - Google Patents

Abstract

A container (1), suitable as a hot-fill container, includes a controlled deflection flex panel (3) which may invert and flex under pressure, such as hot-fill conditions, to avoid deformation and permanent buckling of the container (1). The flex panel (3) includes an initiator portion (8) which has a lesser projection than the remainder of the flex panel (3) and initiates deflection of the flex panel (3).

Description

Container with plates that adapt to pressure

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. The polyester must therefore be heat treated for molecular changes 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 reinforce plate 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. Thus, pressure is applied to the side wall of the vessel. 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 adapts to the initial natural curvature outwardly due to internal hydraulic pressure and temperature, followed by a curvature inwardly due to the vacuum generated during 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. 5,908,128 discloses another resilient plate to respond to hydraulic pressure and forces induced by the post-filling temperature. 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 container is therefore determined again on the basis of the degree of possible deflection of the plates, as is the case with a standard hot-water bottle. However, the deflection rate 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 in various standard ways.

Krishnakumar et al. U.S. Pat. 5303834 shows additional resilient 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.

should 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 "resilient" plates that can be moved from a first, convex position to a 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 opposing walls of the vacuum stability of the hot-filled containers, which are intended to maintain a generally cylindrical shape when the vacuum is applied. A larger suction causes the side wall to be enlarged by which they are drawn into the concave shape thicker than for smaller plate sizes than in the standard six-plate construction on a predominantly cylindrical container. The design of the container increases the force applied to each of the two plates, thereby increasing 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 subjected to stress. 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 for this. 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 has previously described the formation of longitudinal ribs preventing 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 greater bending of the side walls to which the negative pressure is applied so that the pressure applied to the container can be more easily adapted. Here, too, the reinforced ribs of various types described above and the positioning 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.

One aspect of the invention shows a container with a central longitudinal axis, said container comprising at least one resilient plate that is reversible, said resilient plate having at least one region extending from a direction of said plane, said plane being defined by said longitudinal axis and said resilient the plate also includes at least one initiator element region extending in said direction to a lesser extent, wherein in use the deflection of the initiator element region deflects the remaining portion of the flexible plate.

In one preferred embodiment, the projection is outwardly relative to the plane.

In another preferred embodiment, the projection is in the inner direction with respect to the plane.

In one preferred embodiment, the flexible plate may be arched

In another embodiment, the resilient plate may be comprised of two resilient portions meeting at the top.

Preferably, the flexible plate may be positioned between relatively inelastic flat areas.

In one preferred embodiment, the initiator element region, or each of the initiator element regions, is located predominantly at the end of said resilient plate.

In another preferred embodiment, the initiator element region may be located around the center of the flexible plate.

The initiator element area or each of the initiator element areas may preferably comprise a predominantly flat section.

The flat section may preferably be located at the distal end of said region with an initiator element relative to the lagging portion of the flexible plate.

In one preferred embodiment, the initiator element region, or each of the initiator element regions, may project in the opposite direction with respect to the remaining portion of the flexible plate.

The boundary between said initiator region and the remaining portion of said resilient plate may be predominantly curved in the circumferential direction of the plate.

In one preferred embodiment, the projection of the flexible plate may gradually increase away from said region with the initiator element.

In another embodiment, the projection of the flexible plate away from said region with the initiator element may remain largely equally large.

The container may preferably comprise a connecting area between said flexible plate and said flat areas, the connecting area being adapted to position said flexible plate and said flat areas at different points of circumference with respect to the center of the container.

The joining area may preferably have a predominantly U-shaped shape, wherein the flank of the joining area towards the flexible plate is adapted to bend, whereby the "U" shape is substantially straight when the flexible plate is in the first position and returns to the original "U" shape when the flexible plate is inverted from the first position.

The projection of the initiator element region may be adjusted to allow the initiator element region to be deflected after the predetermined liquid introduced into the container has been cooled to a predetermined temperature.

The resilient plate may preferably be adapted so that, when in use, the initiator element is rotated upon deflection.

Another aspect of the invention shows a flexible plate with controlled deflection, wherein the initiator element region extends at a predetermined rate and the elastic region extends away from said initiator element region to a greater extent, the deflection of the flexible plate in a controlled manner in response to the varying vessel pressure .

Another aspect of the invention shows a flexible plate with controlled deflection for a container filled with hot liquid, the initiator element region extending at a predetermined rate and the resilient region extending away from said initiator region increasingly, wherein said side wall between said regions is bent outwardly, wherein the deflection of the resilient plate between said regions increases in a controlled manner in response to varying pressure in the vessel.

The flat region may preferably be positioned between said inelastic regions so as to form an end portion of said region with an initiator element.

Another aspect of the invention shows a resilient control plate having an initiator element region extending at a predetermined rate and a resilient region extending away from the initiator element region to a lesser extent, wherein the resilient region is disposed away from said initiator region, the deflection being The elastic plate between said regions runs in a controlled manner in response to varying vessel pressure.

In one preferred embodiment, said region with the initiator element and / or the elastic region may be predominantly arched.

In another preferred embodiment, said region with the initiator element and / or the resilient region may be comprised of two plate portions abutting at the top.

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 the container according to one embodiment of the invention. Figure 2a shows a front view of the plate surface of the container of Figure 1.

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

Figure 3 shows a side view of the inverted plate surface of Figure 2a.

• f

Figures 4a * c schematically show a cross-section of the container of Figure 1 sequentially along lines A-C when the plate surfaces are not inverted.

Figures 5a-c schematically show cross-sections of the container of Figure 1 sequentially along lines A-C when the plate surfaces are inverted.

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

Figure 7a shows a front view of another embodiment of the plate surface.

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

Figure 8a shows a front view of another embodiment of the plate surface.

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

Figures 9a-c and figures d-f show diagrammatic cross-sections taken sequentially with lines corresponding to the letters A-C of the container of Figure 1 having another plate surface in an 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 is in particular a container for filling with a hot liquid intended to be filled with a liquid at a temperature higher than room temperature. The container 1 may be formed in a folded form of polyester or other plastic, e.g. heat treated polyethylene terephthalate (PET). The lower part of the side wall 2 comprises a plurality of vertically oriented longitudinal vacuum plates 3, which are spaced along the perimeter of the container, separated from each other by the smooth longitudinal flat areas 4. Each plate may be generally rectangular in shape and adapted to be filled with hot liquid , closing the container and then cooling the liquid in. During the process, the vacuum plates 3 behave so as to compensate for the vacuum caused by the filling with hot liquid.

In FIG. 2a, the vacuum plate 3 of the container 1 is shown. The vacuum plate 3 comprises at least one connecting region 7 which connects the projecting region 5 with the flat regions 4. The projecting region 5 comprises a region with an initiator element 8 which controls the connection of the projecting region 5 and the connection region 7. Preferably, the connection region 7 can be folded in relatively easily under the influence of a vacuum and the region with the initiator element 8 will deflect the projecting region 5 by inverting and then folding inwards. Thus, a much larger volume of vacuum plates will be exhausted, even with the prior art flexible plates. 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 i to the edge of the flexible plate 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 independent addition of the flat region 4 on one side and the addition of the flexible plate 3 and its optimization for deflection on the other side. The connecting area 7 compensates for all circumferential differences in radius between the two structures.

The boundary 8A between the regions with the initiator element 8 and the rest of the projecting region 5 is shown as being strongly arched in the circumferential direction of the plate 3.

The degree of arcuate deflection or projection of the region with the initiator element 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 projecting region 5, thereby giving greater vacuum sensitivity. The region with the initiator element 8 further comprises an end of the initiator element 9, which is predominantly flat and is therefore most sensitive to negative pressure. Thus, when the vessel 1 is subjected to a vacuum, the vacuum plate 3 may bend at the end of the initiator element 9, followed by a deflection and reversal of the entire region with the initiator element 8, and then the inverted region 5 is further inverted. element 9 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 projecting region 5.

Importantly, in response to a gradual reduction in the volume of the vessel I during cooling, the reversal of the protruding area 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 protruding 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. 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 projecting region 5 allows a larger number of plates 3 to be contained in a single container 1. The plate 3 may also not be large, since a low vacuum is sufficient to deflect the plate. Thus, the plates 3 need not be large, nor 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 plate 3 is shown with the protruding region 5 in the inverted position, the dashed line indicating the boundary of the protruding region 5 with the connecting region 7. In a preferred embodiment of the invention, the protruding region 5 is predominantly arched in radially outward or transverse direction as shown by direction arrow 6. the region 7 is predominantly U-shaped, where the relative height of the sides "U" determines the relative radius where the flat region 4 and the protruding region 5 are located. The termination of the initiator element 9 is most sensitive to vacuum as it protrudes to the smallest extent; has the smallest arc of the protruding area 5.

Figure 3 shows a plate 3 with a protruding area 5 which is reversed as a result of the vacuum. The end of the initiator element 9 and the region with the initiator element 8 are first deflected and inverted so that the adjacent surface of the projecting region 5 is pulled inwardly. This continues along the protruding region 5 until the protruding region is completely reversed, as indicated by the mark 5b. The dotted line in Figure 3 shows the edge of the projecting region 5 and the dashed line 5a shows the position of the projecting region 5 when not reversed.

Importantly, when the vacuum is removed from the container after the closure has been removed, the plate 3 may leave the position it has assumed by the vacuum and return to its original shape. This can be assisted by uniformly increasing the arc curvature from one end of the projecting region 5 to the other, wherein the arc of curvature will gradually increase from the region with the initiator element 8. Alternatively, the projecting region 5 may have a substantially constant increase. When the pressure is released, the region with the initiator element 8 causes the transverse movement of the plate 3 arched inward, starting by reversing the region with the initiator element 8, followed by an elevated projecting region 5 without causing irreversible deflection. The vacuum plate 3 can be inverted repeatedly 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 protruding region 5 in an inverted position. In this preferred embodiment, the projecting region protrudes increasingly outwardly from the region with the initiator element 8.

Figures 5a-c show cross-sections of the vessel I along lines AA, BB and CC with the protruding region 5 in the fully inverted position 5b due to the applied negative pressure. The area of the protruding area 5 along the line AA is deflected to a relatively large extent compared to the region of the proximal area with the initiator element 8. The dotted lines 5a in Figures 5a-c indicate the position of the protruding areas 5 without applying vacuum.

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

Figure 7a shows a front view of another embodiment of the vacuum plate 300. The vacuum plate 300 comprises two projecting regions 500 positioned vertically side by side. The region with the initiator element 800 is located in two directions from the central end of the initiator element 900. In this embodiment, the center of the vacuum plate 300 is most susceptible to deflection under the influence of vacuum and thus deflects first. Figures 7b and 7c show successively the vacuum plates 300 without applying vacuum and in a fully inverted position.

The dotted line 800a illustrates the arc deflection boundary between the region with the initiator element 800 and the rest of the projecting region 500.

Figure 8a shows a front view of another embodiment of a vacuum plate indicated generally by an arrow 3001. The vacuum plate 300 'comprises two projecting regions 500' and 500 positioned vertically side by side with respective regions with an initiator element 800 'with a central area 900' therebetween. However, unlike the vacuum plate 300, the normal position of one of the projecting regions 500 'is concave and not convex (see FIG. 8b). By applying hydraulic pressure, the concave projecting 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 plates 300 '. Once the liquid has cooled, the vacuum causes the two projecting regions 500 'and 500 to reverse in the direction of the arrow 6B (see Fig. 8d).

It is valuable that the profile and / or design of the vacuum plates can be varied. As shown e.g. 9, the container 1 may have vacuum plates with protruding areas 51, including two planar areas 10 which meet at the top ϋ so as to form an angular plate, i.e. not a curved plate. Figures 9a-c show cross-sections through lines AA, BB and CC of the container I of Figure 1 with protruding areas 5 '. Figures 9d-f show inverted positions of protruding areas 51 of Figures 9a-c, solid lines 5'b show inverted position and dotted lines 5 'and show the position before turning. In addition or otherwise, the plates 3 of all embodiments can be positioned transversely with respect to the longitudinal axis of the container I, 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 specific 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 1 / Γ A container suitable for filling with a liquid at a temperature higher than room temperature, characterized in that it comprises at least one flexible plate with controlled deflection for compensating for pressure changes induced in the container, said flexible plate being t extending in the longitudinal and transverse directions, said elastic plate having an elastic region with a transverse curvature in the longitudinal direction and an adjacent elastic region with an initiating element with another transverse curvature, and said curvature merging longitudinally so that movement of said elastic region in response to vacuum is transmitted and causing a longitudinally increasing deflection of said elastic region in response to increasing pressure changes in the vessel. Container according to claim 1, characterized in that the curvature of said initiator region longitudinally coincides with said resilient region such that the curvature gradually increases from the initiator region to the resilient region. Container according to claim 2, characterized in that said elastic region comprises a transverse curvature of the variable in the longitudinal direction. Container according to claim 2, characterized in that said elastic region has a greater transverse curvature than that of said region with the initiator element with respect to said longitudinal dimension of said elastic plate. ⁵ A container according to claim 2, characterized in that in response to a change of pressure in said vessel, said curvature of the initiating element turns. Container according to claim 5, characterized in that in response to a change in pressure in said container, the curvature of said elastic region is reversed. Container according to claim 5, characterized in that the curvature of said region with the initiator element is reversed in response to a vacuum in said container. Container according to claim 6, characterized in that, in response to a vacuum in said container, the curvature of said elastic region is reversed. A vessel with a longitudinal axis, wherein said vessel is adapted to be filled with a liquid at a temperature above room temperature, said vessel comprising a wall with at least one resilient plate that can be inverted, said resilient plate being adapted to bend inwardly upon cooling of said liquid upon cooling of said liquid, said flexible plate having at least one protruding region, said protruding region extending from a direction defined by a plane defined by said longitudinal axis and said flexible plate also comprising at least one region with and the resilient plate also includes a connection region, and said connection region connects said region to the initiator element with said wall, wherein in use, deflection of the connection region inverts the curvature of the initiator element region, no. this will reverse the curvature of the protruding area. Container according to claim 9, characterized in that the projection is in an external direction with respect to said plane. Container according to claim 9, characterized in that the flexible plate is predominantly arched with an arc of the region with an initiator element smaller than the projecting region. Container according to claim 10, characterized in that the flexible plate is predominantly arched with an arc of the region with the initiator element smaller than the remaining portion of the flexible plate. Container according to claim 9, characterized in that the projection is in the inner direction with respect to said plane. Container according to claim 13, characterized in that the flexible plate is predominantly arched with an arc of the region with the initiator element smaller than the remaining portion of the flexible plate. 15. A thin-walled container with a longitudinal axis, characterized in that it is made of plastic and is adapted to be filled with a liquid at a temperature higher than room temperature, said container comprising: an upper part comprising: an upper entrance with a closure capability; sealing; a lower part with a base closing the bottom of the container and a wall between said upper and lower parts, said wall having a generally cylindrical shape and comprising at least one longitudinally vertically oriented vacuum plate, said plate being adapted to cool down said liquid when the internal pressure is reduced said vacuum plate comprising a connecting region and a longitudinal region extending outwardly, said connecting region joining said extending region outwardly with said wall, and said connecting region being adapted to be folded inwardly upon cooling of said liquid, said region extending outwardly comprises a region with an initiator element and said region with an initiator element comprising a predominantly flat region and an elevated region, said flat region joining said connecting region with said developing The raised region extends outwardly to a lesser extent than the rest of the outwardly extending region, and in use, said flat region curves inwardly due to increased vacuum, causing the curvature of said raised region to be reversed, thereby reversing the curvature of the outward extending region. 16. A container, characterized in that it has at least one resilient control plate having a region with an initiator element that enters a predetermined amount and a resilient region that extends away from said region with the initiator element to a greater extent, the deflection of the resilient plate in the reaction, the varying pressure in the vessel proceeds in a controlled manner. 17. A container adapted to be filled with a liquid at a temperature higher than room temperature, comprising a wall with a flexible plate with controlled deflection having an initiator element region extending away from said initiator region in a progressively increasing amount, the wall between said regions is bent outwardly, wherein the deflection of the flexible plate between said regions increases in a controlled manner in response to varying pressure in the vessel. r * 18. A container having a controlled deflection plate with a region having an initiator element extending at a predetermined rate and a resilient region extending in the opposite direction to the initiator element region to a lesser extent, the resilient region being spaced away from said region with the initiator element, wherein the deflection of the flexible plate proceeds in a controlled manner in response to the varying pressure in the vessel. 19. A container adapted to be filled with a liquid at a temperature higher than room temperature, comprising a wall with a flexible plate with controlled deflection, the initiator element region extending at a predetermined rate and the flexible region extending away from said initiation region a gradually decreasing element, wherein said wall between said regions is folded inwardly, wherein the deflection of the flexible plate between said regions increases in a controlled manner in response to varying vessel pressure. A controlled bias container according to any one of claims 16 to 19, characterized in that it comprises a pair of predominantly inflexible regions between which said initiating element region and said resilient region are located, wherein said flat inflexible regions are flat the region so as to form an end portion of said region with the initiator element. Controlled deflection container according to any one of claims 16 to 20, characterized in that the initiator element region and / or the elastic region is predominantly arched. Controlled bending container with a controlled deflection plate according to any one of claims 16 to 20, characterized in that the region with the initiator element and / or the flexible plate consists of two plate parts contacting at the top. A container with a longitudinal axis, comprising a wall with at least one resilient plate that can be inverted, said resilient plate being adapted to bend by varying the internal pressure, said resilient plate having at least one projecting region, and said projecting region extending from the direction of said plane, said plane being delimited by said longitudinal axis, said resilient plate also comprising at least one region with an initiator element extending in said direction to a lesser extent and said resilient plate also comprising a connecting region and said connecting region connecting said region having an initiating element with said wall, wherein in use, deflection of the connecting region causes reversal of the curvature of the region with the initiating element, causing reversal of the curvature of the projecting region. A container, characterized as predominantly described herein with reference to Figures 1 to 5, 6, 7, 8 or 9 of the accompanying drawings.