RU2598995C9 - Stable container c petaloid base - Google Patents

Abstract

FIELD: packaging industry.

SUBSTANCE: petaloid base of stable container, which has approximately a hemispheric lower base and a set of ovate support elements extending from base surface and setting a set of legs.

EFFECT: shape promotes higher resistance to cracking, makes it possible to increase capacity to height of container and reduce area of surface of base, consumption of materials.

34 cl, 13 tbl, 12 dwg

Description

FIELD OF THE INVENTION

The present invention relates to a stable container, in particular to a petaloid base for such a container. Containers can be made by blow molding of plastic materials, such as polyethylene terephthalate (PET).

State of the art

It is known from the prior art that the term “PET” includes compositions having, as the main component, polyethylene terephthalate, but also possibly containing other components. For example, a composition containing about 95% polyethylene terephthalate and 5% nylon can be used. As is known in the art, these materials may be mixed or may be present in different layers, for example, in multilayer injection molding and multicomponent molding.

Blow molded PET containers have long been used as beverage containers. Recently, it has been proposed to use such containers as keg containers for transporting, storing and bottling drinks, such as beer. An example of this keg is presented in WO 2007/064277.

Document WO 2007/064277 is presented by way of example only and by reference only: the entire concept of the present invention is not limited to the particular application, material, or method of manufacturing the container. However, the invention has particular advantages in the case of use for thin-walled containers made by blow molding, which can be made of polyethylene terephthalate. Therefore, the invention is described specifically in connection with such containers.

The first PET containers had a simple hemispherical base and were considered stable due to the fact that a separately formed profile was attached to the base. Despite the fact that the hemispherical base itself is quite simple, easy and durable, the use of an additional profile increases the cost and cost of the material and complicates further processing.

Now it is well known that in order to make a PET container stable without using a separate lining, it is possible to provide the container molded with it in one piece with a petaloid base. The term “petaloid” refers to a base structure with several “legs” that are positioned at an angle to each other throughout the base, resulting in a base structure resembling petals when viewed from the bottom up to the bottom of the container. The container usually has a cylindrical side wall that forms a circle in a horizontal cross section, then the legs of the base are usually located on a tangent circle concentric to the circumference of the side wall cross section and having a diameter smaller than the diameter of the circumference of the side wall cross section. Feet provide a stable multi-point support for the container.

Container manufacturers are constantly striving to reduce material costs and costs, as well as facilitate the recycling process. However, not only this caused the use of solid containers with a petaloid base; Now attempts are being made to improve the petaloid base in such a way that it becomes possible to manufacture containers at lower cost while maintaining reliability during storage, transportation and operation. It is especially desirable to reduce the amount of material required for the container to have the proper strength and stability for commercial use. Even small material savings per container will have a tremendous impact on the cost of production from ten million to billions of containers per year.

The optimal ratio of the amount of material used and the strength of the container is especially important when using the container as a sealed container. For example, a container can be used for storing, transporting and bottling drinks, such as beer. The drink may be carbonated initially, or at excess pressure a propellant gas may be injected into the container, which displaces the drink from it. Such a container should remain resistant to these internal pressures under various environmental conditions. Along with resistance to internal pressures, the container must withstand rough handling during transport.

Disclosure of invention

The present invention has been developed in accordance with these premises. In one aspect, the invention provides a petaloid base for a stable container that has a spheroidal contour of the lower base and several spheroidal support formations that interrupt and protrude from the lower base, forming the corresponding set of legs.

Since the legs are spheroidal, it should be understood that their contact with the flat surface on which the base rests is through a convex surface. Therefore, it is preferable that the contact of a particular leg with a flat surface takes place at a point on the curved surface of that leg.

In order to maximize the strength and capacity of the container while minimizing the consumption of material, it is preferable that the contour of the lower base is essentially hemispherical. For example, the contour may take the form of a spheroid compressed at the poles, the polar axis of which coincides with the central axis of the base. For the same reasons, the support elements must be elongated accordingly and have the form of a partial ellipsoid or an elongated spheroid. In a preferred embodiment of the invention, the support elements are oval (partially ovoid), in which case the contact points of the legs are most conveniently determined by the widest part of the cross-section of each support base, biased towards the inner end of the support elements. In other words, the support elements taper to a greater extent in their radially outer regions than in their radially inner regions with respect to the central axis of the base.

Preferably, the base contains support elements such as legs, the shape of which is substantially rotationally symmetrical about the axis. For example, rotationally symmetrical axis-shaped legs such as spheroids, ellipsoids and ovoids are preferred. If these forms, which form the base, are rotationally symmetric, then the amount of material used to produce these structures can be advantageously minimized. At the same time, the internal capacity of the base and its strength can also be increased.

In order to use the minimum amount of material for the legs, it is preferable that the elongated support elements have corresponding longitudinal axes lying in planes radially diverging from the central axis of the base. These axes of the support elements respectively conically extend outward and upward from the central axis of the base.

Each support element may have an elliptical or preferably ovoid intersection with the bottom contour of the base. In order to reduce the stress concentration, it is preferable that the intersection region has a concave profile.

In order to increase the strength of the base, the support elements should preferably diverge radially from the central protrusion. This protrusion can be multifaceted, while the number of sides corresponds to the number of legs.

The support elements are separated by recesses, which, for example, can radially diverge from the polygonal protrusion. In order to minimize material consumption, it is preferred that the recesses expand toward the outer end of the base. Each recess may have, for example, an inner and outer portion, and the walls of the recesses may diverge more sharply on the outer portion than on the inner. However, the walls of the recesses may diverge both in the outer and inner sections.

In the plan view, each support element can have an enlarged central region from which the support element tapers inward through the entire inner part to the inner end. In this case, the internal parts of the support elements are located, respectively, segmental around the entire base. To minimize material consumption, it is preferable that each supporting element in plan view tapers from the enlarged central region to the outside through the entire external part towards the outer edge of the supporting element.

The concept of the invention extends to containers such as barrels, kegs or bottles having a base according to the invention.

Preferably, the container is made by blow molding a preform, most preferably made of PET.

If a material such as PET is used, it is preferable that the container has a ratio of the average pressure resistance to the material flow coefficient of more than 3 MPa / kg. More preferably, the ratio of the average pressure resistance to the material flow coefficient is more than 3.75 MPa / kg. It is also preferred that the container has a capacity ratio of a material flow rate of more than 40 l / kg. More preferably, the ratio of capacity to material flow rate is more than 80 l / kg.

Brief Description of the Drawings

For a better understanding, the invention will be described by way of example with reference to the accompanying drawings, in which:

Figure 1 presents a bottom view of the container with a petaloid base according to the invention;

Figure 2 presents a side view of the petaloid base of the container depicted in Figure 1;

Figure 3 presents a view in longitudinal section of the petaloid base of the container depicted in Figure 1;

Figs. 4 (a), 4 (b) and 4 (c) respectively show a bottom view, a side view and a perspective view of a container with the base shown in Figs. 1-3, using an example of a 0.33 liter bottle;

Figs. 5 (a), 5 (b) and 5 (c) respectively show a bottom view, a side view and a perspective view of another container with the base shown in Figs. 1-3, using a 20 liter keg as an example;

6 (a), 6 (b) and 6 (c) respectively show a bottom view, a side view and a perspective view of another container with a base according to the invention, using an example of a 1.5 liter bottle; in this example, the base is a seven-leg version;

Fig. 7 is a bottom view of the container of Fig. 1, which shows section lines related to Figs. 8 and 9;

On Fig presents an enlarged partial view of a longitudinal section of the petaloid base of the container depicted in Fig.7, made along the section lines VIII-VIII in Fig.7;

In Fig.9 presents an enlarged partial view of a longitudinal section of the petaloid base of the container depicted in Fig.7, made along the lines IX-IX in Fig.7;

Figure 10 presents a side view of the container with a petaloid base with five legs, shown in Fig.1-3, for example, a keg with a non-cylindrical side wall with a volume of 18 l;

FIG. 11 is a side view of a plastic preform for blow molding a keg of 18 L volume shown in FIG. 10; and

Fig. 12 is an enlarged longitudinal sectional view of the base of the container of Fig. 3, as well as a beverage dosage tube inside the container.

The implementation of the invention

1 and 2, the container 10 comprises a hollow body made of PET by blow molding. The container body 10 has a circular horizontal cross-section, the radius of the circumference of which passes orthogonally to the central longitudinal axis 12, which extends centrally through the closed base 14 of the container 10. Above the base 14 (not shown in FIGS. 1 and 2), a substantially cylindrical side wall ends with a neck. The side wall is made in one piece with the base 14, which covers it at the lower end; in turn, the side wall is made integral with the upper part in the neck of the container 10.

The supporting shape of the base 14 is a slightly flattened hemisphere that is rotationally symmetrical with respect to the central longitudinal axis 12 of the container 10. In other words, the lower shape of the base 14 is a spheroid compressed at the poles, which is a rotationally symmetric ellipsoid with a diameter on the polar axis (coinciding with the central longitudinal axis 12) is less than the diameter of the equatorial circle, the plane of which divides it into two parts. This approximately hemispherical shape maximizes resistance to internal pressure, reduces stress concentration to prevent cracking, and maximizes internal volume while minimizing material consumption.

In accordance with the invention, the base 14 comprises integral molded streamlined legs having a petaloid arrangement around the base. In this example, the legs are defined by five hollow egg-shaped support elements 16, which are evenly and radially diverged from a relatively small essentially pentagonal convex protrusion 18 on the central longitudinal axis 12. In a more general sense, the support elements 16 are elongated ellipsoids in the form of elongated spheroids, diameter which along their polar axis are larger than their equatorial diameter.

The polar axes 20 of the spherical support elements 16 are directed outward and upward in planes radially spaced at equal intervals relative to the central longitudinal axis 12 of the container 10. Thus, the polar axes 20 of the support elements 16 (see FIG. 2) lie on an imaginary surface of a truncated cone, located around the central longitudinal axis 12.

The pairs of support elements 16 adjacent to each other on the circumference are separated by recesses 22, which diverge evenly around the circumference from the apex 24 of the pentagonal central protrusion 18. The bases of the recesses repeat the spherical shape of the base 14 and open at their outer edges on the outer part of the base 14, which is located radially the outside is lower than the support elements 16. In this case, each support element 16 is connected to the central protrusion 18 by means of a transitional part that is smoothly curved without any gaps and transitions odes.

Thus, as shown in FIG. 3, the support member 16, the smoothly curved transition portion and the central protrusion 18 together form a wavy profile.

As shown in FIG. 3, the convex central protrusion 18 has a radius of curvature r smaller than the total radius of curvature R of the spherical base 14: R> r. Moreover, the convex central protrusion 18 is located at a level at a distance from the lowest point of the contour of the lower base, that is, actually below it. Also, the convex central protrusion 18 is located within the height of the supporting elements 16, that is, actually above them.

The supporting elements 16 extend outward from the lower spheroidal contour of the base 14 due to the egg-shaped convex walls. The convex wall of each supporting element 16 is surrounded by a concave transition zone 26 having a closed egg-shaped contour. The transition zone 26 runs smoothly in the spheroidal wall of the base with a large radius of curvature and helps to reduce stress concentration and reduce the likelihood of cracks. The transition zones 26 adjacent to the circumference of the support elements 16 partially define the recesses 22 between these support elements 16.

Each support element 16 is essentially elliptical (in this example, egg-shaped) when viewed from below, and reaches a maximum width in the enlarged central region 28 between its inner end 30 and outer end 32. Thus, each support element 16 tapers in opposite directions from the widest part of the central region 28: along the inner part 34 inward to the central longitudinal axis 12 and the outer end 30; and also along the outer portion 36 outward from the central longitudinal axis 12 to the outer end 32.

In the bottom view, the inner parts 34 of the support elements 16 tapering inwardly cone inwardly are located close to adjacent elements on the round base 14, like orange slices. The inner parts 34 of the support elements 16 alternate with the narrow inner sections 38 of the recesses 22 separating them, which can be almost parallel, but in the example shown, they expand slightly as they move away from the pentagonal central protrusion 18 towards the outer edge. However, where they extend into the outer sections 40 beyond the widest part of the support elements 16, the recesses 22 expand almost exponentially between the tapering outer parts 36 of the support elements 16 until they reach the maximum width between the outer ends 32 of the adjacent support elements 16.

Thus, when moving along the recesses 22 from the Central longitudinal axis 12 towards the outer contour of the base 14, the distance between the supporting elements 16 increases. For comparison, in the known petaloid base disclosed in EP 06711331, this distance is reduced.

Seen from the side, the support elements 16 are located outside the lowest point of the base 14 on the pentagonal protrusion 18, that is, actually below it. All support elements 16 are located on the same level. Thus, at this level, each abutment element 16 has a contact point 42 that lies stably on a flat abutment surface (not shown) perpendicular to the central longitudinal axis 12 of the container 10.

Figure 3 shows that the supporting elements have a shape resembling an egg, and the widest part of their profiles is slightly biased inward and downward towards the inner ends 30.

The contact points 42 of the support elements 16 are equidistant from each other on the tangent circle centered on the central longitudinal axis 12 of the container 10. The diameter (x) of the tangent circle refers to the diameter (D _y ) of the side wall of the container 10 as:

$$\frac{D_y}{0.5x}=k$$

According to the invention, k is preferably in the range of between 3.6 and 5.5, more preferably between 4.0 and 5.3, even more preferably between 4.2 and 5.0, and is usually 4.7. This characteristic can be compared with typical PET bottles on the market, which typically have a coefficient k ranging from 2.5 to 3.5. The relatively large k value of the invention is due to the relatively small x value. This is an advantage since the small touch circle creates a small - and therefore stronger - stiffness diaphragm between the contact points 42.

As a result, the central part within the tangent circle between the contact points 42 of the support elements 16 is sufficiently rigid and, therefore, resistant to movements due to internal pressure up to the burst pressure. The stiffness of this region inside the touch circle is reinforced by a wavy section of the wall defined by the internal parts 34 of the support elements 16, the recesses 22 between them and the central protrusion 18.

The strength of the area within the tangency circle is important not only with regard to bursting pressure, but also for stability, because the lowest point of the central longitudinal axis (the lowest point of the base 14 on the central pentagonal protrusion 18) tends to be "pushed" down under the influence of internal pressure . If the lowest point reaches the surface used as a support, the container will not be able to stand stably on the contact points 42 of the support elements 16. The strength of the shape of the base according to the invention means that the distance from the central top of the base to the supporting surface is relatively small compared to existing solutions, which provides stability and capacity in relation to the height of the container.

When considering any support element 16 in the longitudinal direction (i.e., from the side of the container wall 10 toward the central longitudinal axis 12), the contour of the support elements 16 describes a substantially constant convex radius between the concavity radii of the transition zones 26 to each side. A traditional petaloid base usually has flat surfaces with V-shaped recesses between the legs to minimize material costs and stress concentration. Concentrations of stress create areas in the container that are susceptible to cracking under high internal pressure.

The base structure 14 of the present invention is particularly suitable for containers for dispensing a liquid under pressure. In particular, the increased value of k makes the base more durable and therefore more suitable for maintaining stability when the container is exposed to high internal pressure. Moreover, with an increase in the value of k, it is possible that the curved central protrusion 18 will be lower in the direction of the central axis than would be possible for a container that is subjected to high internal pressure. This can maximize the volume of the drink that can be dispensed from the container 10. This advantage is discussed with reference to FIG. 12, which shows the same longitudinal section of the base of the container 14 shown in FIG. 3, as well as a tube 120 for dispensing drinks .

In this regard, the container is used as a beer keg 10, which is equipped with a closing device on the neck of the keg 10. The pipe 120 is attached to the closing device (not shown) and is located along the central longitudinal axis 12 to the base of the keg 10. The lowermost axis of the edge of the pipe 120 extends to the central protrusion 18. The end of the tube 120 falls inside the central protrusion 18 and hangs inside the top of the central protrusion 18, thereby providing an annular gap through which the beverage can pass from the keg 10 to the tube 120 and vice versa. The shape of the central protrusion 18 also allows you to correctly position the lower axis end of the tube 120 and hold it inside the Central protrusion during installation and operation.

When spilling a drink, keg 10 is in an upright position. The closing device allows the injection of gas under pressure into the upper space of the keg 10 in order to squeeze the drink through the tube 120. Since the lower axis of the edge of the tube 120 is located inside the central protrusion 18, the central protrusion 18 is in a relatively low axis position inside the keg 10, which guarantees the extraction of almost the entire volume of the drink contained in keg 10.

To further increase the amount of drink that can be removed from keg 10, you can place the tube 120 in one of the supporting elements 16. In this case, the tube 120 will need to be displaced from the central longitudinal axis 12 towards its lower edge. Although this can significantly increase the amount of beverage that can be removed from keg 10, it can also complicate the installation of the closure and tube 120 on keg 10. In particular, installing the curved tube 120 in keg 10 may require a more complex automated installation process. Moreover, bending of the tube 120 and deviation from the central longitudinal axis 12 can expose the closure device to which the tube 120 is attached with its upper end to uneven loads. This can reduce the reliability of the closing device, which is of particular importance for keg 10, which is subjected to high internal pressure.

The petaloid base of the invention can be used in the manufacture of many types of containers, such as bottles and kegs. FIGS. 4 (a), 4 (b) and 4 (c) and FIGS. 5 (a), 4 (b) and 4 (c) show a base according to the present invention having five legs used respectively for a bottle 44 volume of 0.33 liters, which is usually used for carbonated soft drinks, and for keg 46 volume of 20 liters, which is usually used for beer. These images show characteristics not shown in FIGS. 1 and 2, namely, a cylindrical side wall 48 crowned with a neck 50. The side wall 48 is made integrally with the base 14, with which it ends from the bottom; in turn, the side wall 48 is made integrally with the neck 50 at the top of the container, which it ends at the top.

Figure 10 shows the base with five legs on the example of a 18-liter keg 104 with a non-cylindrical side wall 108. In the example shown, the side 108 is convex relative to the axis of the central longitudinal axis of the keg 104 and essentially follows an egg-shaped shape. In the lower part along the axis, the side smoothly bends around the spheroidal contour of the lower base according to the invention. In the upper part along the axis, which tapers significantly more than the lower part, the side wall smoothly bends around the concave neck of the keg 104. The convex side wall 108 has a shape in which the resistance to internal pressure is maximum, the internal capacity of the keg 104 is increased and material consumption is minimized. Figure 11 shows an enlarged side view of a plastic preform for blow molding the container depicted in Figure 10.

Without departing from the spirit of the present invention, various variations thereof are possible. For example, a variant of the base according to the invention depicted in FIGS. 6 (a), 6 (b) and 6 (c) can be used for 52 bottles of 1.5 liters. This option has seven support elements 54 instead of five and a multilateral central protrusion 56 between them. As with the five-leg version, the seven-leg base can be used for containers of any size, such as bottles of 0.33 L, 0.5 L, 1 L, 1.5 L or more, and kegs of 20 L and other

To ensure optimal stability, more preferably an odd number of legs, at least three (in this case, the central protrusion usually has the shape of a triangle), but preferably not more than seven; the presence of five or seven legs is most preferred.

Without limiting the essence of the invention defined in the claims, various examples of spatial characteristics of containers can be given.

Table 1 contains the results of comparing the volumes of traditional bases and the base of the invention with respect to a five-leg base. Volumes in the table are expressed in milliliters (ml). By volume is meant the internal capacity of the base, that is, that part of the container that is located below the cylindrical side wall of the container. It should be noted that the base according to the invention has a volume of about five times the volume of a traditional petaloid base of the container, as well as better parameters in terms of compactness and use of materials for each specific volume.

Table 1 Five-legged container Regular base The basis of the invention Keg 20 l, d = 235 mm 128 (20%) 634 Bottle 0.33 L, d = 60 mm 2.7 (18%) fifteen Bottle 0.5 L, d = 65 mm 3.5 (18%) 19 Bottle 1.0 L, d = 80 mm 6.5 (18%) 36 Bottle 1.5 L, d = 95 mm 11 (20%) 55

Tables 2-8 show various parameters and sizes that help determine the shape of the base for each of the container volumes listed above.

table 2 Five-legged container Lower base contour radius The radius of the transition from the contour of the lower base to the side wall Keg 20 l, d = 235 mm 135.0 mm 49.6 mm Bottle 0.33 L, d = 60 mm 34.5 mm 19.1 mm Bottle 0.5 L, d = 65 mm 37.4 mm 20.7 mm Bottle 1.0 L, d = 80 mm 46.0 mm 25.4 mm Bottle 1.5 L, d = 95 mm 54.6 mm 30.2 mm

Table 3 Five-legged container The radial protrusion of the support elements below the radius of the contour of the lower base Touch circle diameter Keg 20 l, d = 235 mm 18.1 mm 99.9 mm Bottle 0.33 L, d = 60 mm 5.3 mm 28.6 mm Bottle 0.5 L, d = 65 mm 5.5 mm 31.0 mm Bottle 1.0 L, d = 80 mm 7.1 mm 38.1 mm Bottle 1.5 L, d = 95 mm 8.4 mm 45.3 mm

Table 4 Five-legged container The length of the supporting elements along the polar axis Width of support elements along the polar axis Keg 20 l, d = 235 mm 80.2 mm 59.5 mm Bottle 0.33 L, d = 60 mm 22.9 mm 15.6 mm Bottle 0.5 L, d = 65 mm 24.8 mm 16.9 mm Bottle 1.0 L, d = 80 mm 30.6 mm 20.8 mm Bottle 1.5 L, d = 95 mm 36.6 mm 24.7 mm ∗ including transition zone

Table 5 Seven-legged container Lower base contour radius The radius of the transition from the contour of the lower base to the side wall Keg 20 l, d = 235 mm 135.0 mm 49.6 mm Bottle 0.33 L, d = 60 mm 34.2 mm 18.9 mm Bottle 0.5 L, d = 65 mm 37.3 mm 20.7 mm Bottle 1.0 L, d = 80 mm 46.2 mm 25.6 mm Bottle 1.5 L, d = 95 mm 54.6 mm 30.2 mm

Table 6 Seven-legged container The radial protrusion of the support elements below the radius of the contour of the lower base Touch circle diameter Keg 20 l, d = 235 mm 18.1 mm 99.9 mm Bottle 0.33 L, d = 60 mm 5.3 mm 28.5 mm Bottle 0.5 L, d = 65 mm 5.8 mm 31.0 mm Bottle 1.0 L, d = 80 mm 7.2 mm 38.5 mm Bottle 1.5 L, d = 95 mm 8.4 mm 45.4 mm

Table 7 Seven-legged container The length of the supporting elements along the polar axis Width of support elements along the polar axis Keg 20 l, d = 235 mm 78.9 mm 54.8 mm Bottle 0.33 L, d = 60 mm 22.4 mm 14.0 mm Bottle 0.5 L, d = 65 mm 24.4 mm 15.3 mm Bottle 1.0 L, d = 80 mm 30.3 mm 19.0 mm Bottle 1.5 L, d = 95 mm 35.7 mm 22.4 mm ∗ including transition zone

Table 8 Transition zone radius (five legs) The radius of the transition zone (seven legs) Keg 20 l, d = 235 mm 12.0 mm 8.0 mm Bottle 0.33 L, d = 60 mm 3.15 mm 1.88 mm Bottle 0.5 L, d = 65 mm 3.44 mm 2.05 mm Bottle 1.0 L, d = 80 mm 4.26 mm 2.54 mm Bottle 1.5 L, d = 95 mm 5.0 mm 3.0 mm

FIGS. 7–9 provide additional spatial information regarding a 20 L keg with a five-foot base 14. Figure 10 and 11, respectively, provides information on the size of the keg 104 with a volume of 18 l with a base with five legs and its preform.

On Fig shows an enlarged partial view of a longitudinal section of the petaloid base of the keg of 20 l, shown in Fig.7, the cross section is made along the section line VIII-VIII. The resulting secant plane intersects the support element 16 at its contact point 42, and is parallel and located radially at a distance of 50 mm from the central longitudinal axis 12 of the keg 10. In this section of the support element 16, its contour has a substantially constant convex radius of 23, 0 mm, which is located between the recesses with a radius of 12.0 mm transition zones 26 and each side.

In Fig.9 presents an enlarged partial view of a longitudinal section of the petaloid base of the keg of 20 l, shown in Fig.7, the section is made along the line IX-IX. The resulting secant plane is aligned with the central longitudinal axis 12 of the keg 10 and intersects the same supporting element 16 as shown in Fig. 8 at the contact point 42. The view in Fig. 9 corresponds to the view shown in Fig. 3, but it shows the following additional information on keg sizes of 20 liters is given in Tables 9 and 10.

Table 9 Radius Lower base contour radius 135.0 mm The radius of the concave central protrusion 35.0 mm The radius of the concave transition zone between the concave central protrusion and the radially inner end of the support element 12.0 mm The radius of the support element in the region of the inner part near the radially inner end of the support element 35.0 mm The radius of the support element in the region of the inner part between the radially inner end and the central region of the support element 43.0 mm The radius of the support element in the central region between the touch circle and the inside 50.0 mm The radius of the support element in the Central region, which is located radially inside and near the tangent circle 20.5 mm The radius of the support element in the Central region, which is located radially outside and near the tangent circle 24.0 mm The radius of the support element in the central region between the touch circle and the outer part 32.0 mm The radius of the support element in the region of the outer part between the radially outer part and the central region of the support element 27.75 mm The radius of the support element in the region of the outer part near the radially outer edge 120.0 mm The radius of the concave transition zone between the contour of the lower base and the radially outer end of the supporting base 12.0 mm The radius of the transition from the contour of the lower base to the side wall 49.6 mm

This data on the size of the radii also applies to points on other supporting elements 16 of the container 10. Such points are usually located inside any plane in which lies both the central longitudinal axis 12 of the container and the polar axis of the specific supporting element 16.

Table 10 Distance The distance along the central longitudinal axis between the curved central protrusion and the plane containing the tangent circle 3.0 mm The axial depth of the central convex protrusion along the central longitudinal axis 4,5 mm The distance along the central longitudinal axis from the contour of the lower base to the plane containing the tangent circle 8.0 mm The distance along the axis parallel to the central longitudinal axis, from the transition zone (between the central protrusion and the support element) to the plane containing the tangent circle 7.5 mm The axial depth of the base part (the distance along the axis from the plane containing the tangent circle to the lower in the direction of the axis of the edge of the cylindrical side wall) 91.2 mm The radial length of the section from the central longitudinal axis to the transition between the base contour and the support element 84.66 mm

In addition to the above spatial characteristics, Table 11 shows the information obtained as a result of tests to assess the bursting pressure. These are data indicative of a standard tensile pressure in a 20 L keg 10 with a five-leg petaloid base 14 according to the present invention. For comparison purposes, pressure assessment tests were also performed on a traditional petaloid base under similar conditions.

Table 11 Test Burst pressure of traditional base (bar) Tearing pressure of the base according to the invention (bar) one 9.29 9.55 2 7.68 9.04 3 9.09 8.59 four 8.92 9.57 5 8.8 9.29 6 5.99 7.78 7 5.96 8.69 8 6.25 8.08 9 9.14 9.31 10 8.82 8.33 Average 7.99 8.82 Maximum 9.29 9.57 Minimum 5.96 7.78 Differents. 3.33 1.79

Thus, it can be seen that the average tensile pressure in a 20 liter keg with a base with five legs is approximately 8.8 bar (880 kbar). In this case, the material consumption for a keg of 20 l corresponds to 0.234 kg of polyethylene terephthalate. Accordingly, it is possible to calculate the ratio of pressure resistance, capacity and consumption of materials for a given keg of 20 l:

The ratio of the average pressure resistance to the consumption of materials = 3.76 MPa / kg

The ratio of capacity to material consumption = 85 l / kg

It is understood that such ratios can be extrapolated to containers of various shapes and sizes with the base described in the present invention.

Figure 10 and Table 12 provide additional dimensional information for keg 104 with a volume of 18 liters.

Table 12 The radius of curvature of the convex contour of the lower base 135.0 mm Case diameter at widest point 287.0 mm The radius of curvature of the convex contour of the body 352.0 mm The radius of curvature of the contour region between the body and the neck 185.0 mm The radius of curvature of the contour of the concave neck 65.0 mm Neck diameter 65.0 mm Total length along the axis 490.0 mm The length along the axis from the base to the neck of the neck 472.0 mm The length along the axis from the inlet of the keg to the label for filling the drink, which indicates 18 liters from the bottom 112.5 mm

11 and Table 13 provide additional information on the dimensions of the preform 106 for keg 104 with a volume of 18 l, shown in FIG. 10.

Table 13 Total length along the axis 195.0 mm Length along the axis from the base to the neck rim 177.0 mm Axis base thickness 6.0 mm The thickness of each cylindrical side wall 11.0 mm The length along the axis of the part of the cylindrical neck below the rim 15.0 mm The length along the axis of the part of the neck below the rim to the cylindrical side wall (including the cylindrical part of the neck and the conical part of the neck) 57.3 mm The diameter of the cylindrical part of the neck 64.2 mm The diameter of the cylindrical side wall 77.0 mm Preform Inner Diameter 55.0 mm Throat Diameter 81.0 mm

The approximate burst pressure for a given 18 liter keg with a five-leg base is approximately 14 bar (1400 kbar). The material consumption for kegs with a volume of 18 l is 0.468 kg of polyethylene terephthalate. Accordingly, the relations of resistance to pressure, capacity and material consumption for a keg with a volume of 18 l can be calculated as follows:

The ratio of the average pressure resistance to the consumption of materials = 3 MPa / kg

The ratio of capacity to consumption of materials = 41 l / kg

For a base with five legs, the following ratios can be used:

20 liter barrel:

Support elements length along the polar axis / width

supporting elements along the polar axis = 1.35

Diameter of a circle of a touch / width of support elements on

polar axis = 1.68

Lower base contour radius / sidewall diameter = 0.57

The radius of the contour of the lower base / radius of the transition from the contour of the lower base to the side wall = 2.72

The radial protrusion of the support elements below the radius of the contour of the lower base / radius of the contour of the lower base = 1.13

Bottles of various volumes:

Support elements length along the polar axis / width

supporting elements along the polar axis = 1.47

Diameter of a circle of a touch / width of support elements on

polar axis = 1.83

Lower base contour radius / sidewall diameter = 0.58

Lower base contour radius / transition radius from contour

lower base to sidewall = 1.81

The radial protrusion of the support elements below the radius of the contour

lower base / radius of the contour of the lower base = 1.15

Similarly, a base with seven legs corresponds to such ratios as:

20 liter barrel:

Support elements length along the polar axis / width

supporting elements along the polar axis = 1.44

Diameter of a circle of a touch / width of support elements on

polar axis = 1.82

Lower base contour radius / sidewall diameter = 0.57

The radius of the contour of the lower base / radius of the transition from the contour of the lower base to the side wall = 2.72

The radial protrusion of the support elements below the radius of the contour of the lower base / radius of the contour of the lower base = 1.13

Bottles of various volumes:

Support elements length along the polar axis / width

supporting elements along the polar axis = 1.59

Diameter of a circle of a touch / width of support elements on

polar axis = 2.03

Lower base contour radius / sidewall diameter = 0.57

The radius of the contour of the lower base / radius of the transition from the contour of the lower base to the side wall = 1.8

The radial protrusion of the support elements below the radius of the contour of the lower base / radius of the contour of the lower base = 1.15

It follows from the foregoing description that an improved form of the petaloid base of the invention has various additional advantages. In particular, the advantage is a smoothly curved shape without sharp angles, which contributes to better resistance to cracking. It is also important that the surface area of the base is less than the surface area of known equivalents. Thus, for a certain amount of polymer, the invention allows the walls to be made thicker, which means that a more solid base can be obtained. Alternatively, the weight and material consumption can be reduced while maintaining the strength of the base. A strong base is especially important when containers are subject to increased internal pressure and / or elevated temperatures, such as carbonated drinks, beer, and hot or pasteurized liquids.

Claims (33)

1. The petaloid base of the stable container, which has a spheroidal shape of the lower base and several spheroidal support elements that protrude from the surface of the lower base and define a set of legs, and the support elements radially diverge from the central protrusion, have the shape of elongated ellipsoids, the longitudinal axes of which lie in the planes radially diverging from the central axis of the base, and directed conically outward and upward from the central axis of the base. 2. The base according to claim 1, the shape of the lower base of which is a spheroid compressed at the poles, the polar axis of which coincides with the central axis of the base. 3. The base according to claim 1 or 2, in which the lower base has a substantially hemispherical shape. 4. The base according to claim 1, in which the supporting elements are in the form of elongated spheroids. 5. The base according to claim 1, in which the supporting elements are egg-shaped. 6. The base according to claim 1, in which the widest part of the profile of each support element is shifted inward towards the inner end of the support element. 7. The base according to claim 1, in which the axis of the support elements intersect at a point lying on the central axis below the base. 8. The base according to claim 1, in which each supporting element intersects with the surface of the lower base along an elliptical contour. 9. The base of claim 8, wherein the intersection is egg-shaped. 10. The base of claim 8 or 9, wherein the intersection is concave. 11. The base according to claim 1, in which the central protrusion has a radius of curvature less than the radius of curvature of the lower base. 12. The base according to claim 8 or 11, in which the Central protrusion is located below the lowest point of the surface of the lower base. 13. The base according to claim 1, in which the supporting element and the Central protrusion are paired through a smoothly curved transition section. 14. The base of claim 13, wherein the support member, the smoothly curved transition portion, and the central protrusion together form a wave-like profile. 15. The base of claim 13 or 14, wherein the transition portion has a bend whose curvature is different from the curvature of the support member and / or the central protrusion. 16. The base of claim 1, wherein the central protrusion is substantially convex with respect to the outer surface of the container. 17. The base according to claim 1, in which the central protrusion forms a recess on the inner surface of the container, the recess being configured to accommodate and fix the free end of the tube for supplying liquid inside the container. 18. The base according to claim 1, in which the central protrusion is essentially multilateral, and the number of sides corresponds to the number of supporting elements. 19. The base of claim 18, wherein the support elements are separated by recesses. 20. The base of claim 19, wherein the recesses radially diverge from the tip of the multilateral protrusion. 21. The base according to claim 19 or 20, in which the recesses expand towards the outer edge of the base. 22. The base of claim 21, wherein each recess has inner and outer sections, and the walls of the recesses diverge in both the outer and inner sections. 23. The base of claim 22, wherein the recess walls diverge more sharply in the outer portion than in the inner portion. 24. The base according to claim 1, in which each supporting element has an enlarged plan view of the Central region, which tapers inward through the inner section to the inner end of the supporting element. 25. The base of claim 24, wherein the inner portions of the support members divide the base into segments. 26. The base of claim 24 or 25, wherein each support element tapers outward from a wide central region through an external portion toward an external end of the support element. 27. A stable container that has a base according to any one of paragraphs. 1-26. 28. The container according to p. 27, in which the supporting elements of the base have corresponding contact points that are located at a distance from each other on the tangent circle, the diameter (x) of which refers to the diameter (D _y ) of the side wall of the container as follows:

where k has a value in the range between 3.6 and 5.5. 29. The container according to p. 28, in which k has values in the range between 4.0 and 5.3. 30. The container according to claim 29, in which k has values in the range between 4.2 and 5.0. 31. The container according to any one of paragraphs. 27-30, for which the ratio of the average tensile pressure resistance to the material flow is more than 3 MPa / kg. 32. The container according to any one of paragraphs. 27-30, for which the ratio of capacity to material consumption is more than 40 l / kg. 33. The container according to any one of paragraphs. 27-30, which contains a tube for pouring drinks located on the Central longitudinal axis of the container and passing between the base of the container and the opening of the container.

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