UA109276C2 - RESISTANT CONTAINER - Google Patents

Abstract

Petaloid base for a stable container that has a practically hemispherical contour of the lower base and numerous egg-shaped constructions of the legs projecting outward from the contour of the lower base to determine the corresponding legs. Its shape is resistant to cracks, increases the container relative to the height of the container, reduces the surface area of the substrate and, accordingly, the use of materials in comparison with known equivalents.

Description

This invention relates to a free standing container, in particular to a petaloid base of a standing container. Such containers can be made by blow molding a plastic such as polyethylene terephthalate (PET).

From the state of the art, it can be seen that the generic term "polyethylene terephthalate" includes compounds that mainly consist of polyethylene terephthalate, and possibly other materials. For example, a compound is used that includes approximately 9595 polyethylene terephthalate and 595 nylon.

It is known from the prior art that these materials can be used together or separately in different layers, for example, in multilayer injection molding and multi-component molding.

Containers made by blow molding from polyethylene terephthalate have been used as beverage containers for a long time. Recently, it has been proposed to use them as containers for transportation, storage and bottling of beverages, such as beer. An example of this capacity is presented in U/O 2007/064277.

The example of UUO 2007/064277 is presented only as reference material: the full concept of the present invention is not limited to a specific operation, material or method of manufacturing the container. However, the invention has specific effects related to thin-walled containers made by blow molding, which can be made of polyethylene terephthalate.

It is in this connection that the present invention is described in this specification.

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

It is known that in order to obtain a stable PET container without an additional separately formed profile, it is necessary to provide the container with an integrally formed petaloid base. The term "petaloid" refers to a base design with multiple "legs" that are at an angle to the base, resulting in a base design that resembles the petals of a flower when viewed from the bottom up at the bottom of the container. The container usually has a cylindrical side wall that forms a circle in horizontal cross-section, then the legs of the base are usually located on a concentric circle of contact whose diameter is less than

Z is the circumference of the cross section of the side wall. The legs provide stable multi-point support for the container.

Container manufacturers are constantly striving to reduce material costs and cost, as well as to facilitate the recycling process. Not only this was the reason for the use of monolithic containers with a petaloid base; attempts are now being made to improve the petaloid base in such a way that it becomes possible to make containers more economically while maintaining strength during storage, transportation and operation. In particular, it is desirable to reduce the amount of material required to give the container adequate strength and durability for commercial use. Even the smallest savings in material per container will have an enormous effect on the production costs of tens of millions 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 hermetic vessel. For example, the container can be used for storing, transporting and bottling beverages, particularly beer. The drink may be carbonated from the very beginning, or if the container is over-pressurized, an extruding gas may be pumped into the container, forcing the drink out of it. Such a container must remain resistant to all internal pressures under various external conditions. Along with resistance to internal pressures, the container must withstand rough handling during transportation.

This invention has been developed in accordance with these premises. On the one hand, the invention is characterized by the presence of a petaloid base of the stable container, which has a spherical contour of the lower base and numerous spherical legs that interrupt it and protrude above it, defining the corresponding number of legs.

Since the legs have a spherical design, it is clear that their contact with the flat surface, on which the base is installed, is carried out with the help of a convex surface. It is preferable that the point of contact of a specific leg with a flat surface is on the curved surface of this leg.

In order to maximize strength and capacity with minimal material consumption, it is preferable that the contour of the lower base is practically hemispherical. For example, the contour may have the shape of a flattened spheroid, where the polar axis coincides with the central axis of the base. For the same reasons, the design of the leg should be elongated and have the shape of either an incomplete ellipsoid or an elongated spheroid. In a preferred embodiment of the invention, the leg structure has an oval shape (incomplete ovoid shape), in which case the points of contact of the leg are most appropriately defined by the widest part of the cross-section of each leg, directed from the outside towards the inner end of the leg structure. In other words, the design of the leg tapers significantly towards the end of the outer part radially in the direction from the central axis of the base.

Preferably, the base consists of structures, such as leg structures, whose shape is rotationally symmetrical about the axis. For example, such shapes as spheroids, ellipsoids and ovoids, which determine the structure of the leg, which is mostly rotationally symmetrical about the axis. Preferably, if these base forms are rotationally symmetric, the amount of material used to produce these structures would be minimized. At the same time, it is necessary to increase the internal capacity of the base and its strength.

In order to minimize the use of leg material, it is preferred that the elongated leg structures have respective longitudinal axes that lie in radially increasing planes with respect to the central axis of the base. These axes of the leg structure respectively have the shape of a cone that increases radially upwards and away from the central axis of the base.

Each leg design can have an elliptical or mostly oval cross-section with a lower contour of the base. In order to reduce the stress concentration, it is preferable that the cross-sectional area be concave.

In order to increase the strength of the base, it is preferable that the leg structures diverge radially from the central projection. This projection can be multi-sided, while the number of sides corresponds to the number of legs.

Leg designs are separated by recesses, which, for example, may diverge from the top of the polygonal projection. In order to reduce material consumption, it is preferred that the recesses widen towards the outer end of the base. Each depression can have, for example, an internal and an external cross-section, and the walls of the depressions can deviate more sharply in the external cross-section than in the internal one. However, the walls of the recesses can deviate both in the outer and inner sections.

In plan view, each leg structure may have an enlarged central region from which the leg structure emanates and tapers in an inner to inner direction

From the edge Then the inner parts of the leg structures are placed separately on the circumference. In order to reduce material consumption in appearance, it is preferred that each leg structure separate from the enlarged central area and expand from the outer part towards the outer end of the leg structure.

The concept of the invention extends to such containers as barrels or bottles with the base described in the invention. Preferably, the container is made by blow molding the initial form, ideally made of PETF.

Preferably, in the case of using PET material, the container should have a ratio of average pressure resistance to material flow rate greater than C MPa/kg. It is preferable that the ratio of the average pressure resistance to the material consumption ratio is greater than 3.75

MPa/kg. It is also preferable for the container to have a ratio of capacity to material consumption ratio of more than 40 l/kg. It is more preferable that the ratio of the capacity to the material consumption ratio is more than 80 l/kg.

To facilitate the understanding of the invention, the invention will be described by way of examples with reference to the accompanying drawings, where:

In fig. 1 is a bottom view of a container with a petaloid base according to the invention;

In fig. 2 is a side view of the petaloid base of the container shown in FIG. 1;

In fig. C shows a section from the side of the petaloid base of the container shown in fig. 1;

In fig. 4(a), 4(b) and 4(c) are respectively a bottom view, a side view and a perspective view of a container with a base as shown in FIG. 1-3, on the example of a bottle of 0.33 liters;

In fig. 5(a), 5(b) and 5(c), respectively, represent a bottom view, a side view and a perspective view of another container with a base as shown in FIG. 1-3, on the example of a barrel with a volume of 20 liters;

In fig. 6(a), 6(b) and b(c), respectively, represent a bottom view, a side view, and a perspective view of another container with the base of the present invention, using a 1.5-liter bottle as an example; in this example, the base is a seven-legged option;

In fig. 7 is a bottom view of the container shown in FIG. 1, marked by cross-section lines that refer to fig. 8 and 9;

In fig. 8 shows an enlarged part of the section from the side of the petaloid base of the container shown in fig. 7, along the intersection lines MP-MPI;

In fig. 9 shows an enlarged part of the side section of the petaloid base of the container, because the one shown in fig. 7, along the intersection lines IX-IX;

In fig. 10 is a side view of a container with a petaloid base with five legs as shown in FIG. 1-3, this example is a barrel with a non-cylindrical side wall of 18 liters;

In fig. 11 is a side view of the plastic initial mold for blow molding the 18 liter barrel shown in fig. 10; and

Fig. 12 shows an enlarged view of a section of the side of the base of the container shown in Fig. 3, as well as beverage filling tubes inside the container.

In fig. The 1st and 2nd container 10 consists of an empty body made by the PET blow molding method. The body of the container 10 is a circular horizontal section, the radius of the circle increases orthogonally to the central longitudinal axis 12, which passes through the center of the closed base 14 of the container 10. Above the base 14, which is not shown in fig. 1 and 2, the almost cylindrical side wall ends with a thinned part. The side wall is a single unit and closes from below at the base 14; in turn, the side wall is a single piece and ends in the upper part of the thinned part at the top of the container 10.

The reference shape of the base 14 is a slightly flattened hemisphere, which is rotationally symmetric about the central longitudinal axis 12 of the container 10. In a more general sense, the lower shape of the base 14 is an oblate spheroid, that is, it is a rotationally symmetric ellipsoid, where the diameter on the polar axis (coinciding with the central along the longitudinal axis 12) is smaller than the largest diameter of the circle, the plane of which divides it in half. This almost hemispherical shape maximizes resistance to internal pressure, reduces stress concentration to avoid cracks, and also increases internal volume while reducing material consumption.

According to the invention, the base 14 consists of integrally formed streamlined legs located on a petaloid base, the legs of the given example are defined as five hollow oval structures 16 legs, which are evenly distributed around the circumference and diverge from a relatively small almost pentagonal convex projection 18 on the central longitudinal axis 12.

In a more general sense, the design of the 16 legs is elongated ellipsoids in the form of elongated spheroids, the diameter of which relative to the polar axis is greater than their equatorial diameter.

The polar axes 20 of the spherical structures 16 of the legs diverge upwards in planes located around the circumference with the same interval relative to the central longitudinal axis 12

From the container 10. Thus, the polar axes 20 of the structures 16 of the legs (see Fig. 2) lie on an imaginary surface in the form of a truncated cone located around the central longitudinal axis 12.

Located next to each other on the circumference of the parts of the structures 16 of the legs are separated by recesses 22, which diverge uniformly around the circumference from the top 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 located radially outside below the structures of 16 legs. At the same time, each structure 16 of the leg and the central projection 18 are connected by means of a transitional part, which is smoothly curved so that there is no gap and transition.

Thus, as shown in fig. C, the design of the leg 16, the smooth curve of the transitional part and the central protrusion 18 together form a wave-shaped cutting surface.

As shown in fig. The convex central protrusion 18 has a radius of curvature r, which is smaller than the total radius of curvature A of the spherical base 14: thus, N»g. Moreover, the convex central protrusion 18 is located below - that is, in operation it is below - the lowest point of the contour of the lower base. Also, the convex central protrusion 18 is located higher - that is, during operation, it is at the top - in the area of the construction of the legs 16.

Designs 16 legs protrude outwards relative to the lower spherical contour of the base 14 in accordance with the oval convex wall. The convex wall of each structure 16 legs is surrounded by a concave transition zone 26 in the shape of an oval circle. The concave transition zone 26 is located in the spherical base wall with a larger radius of curvature to reduce stress concentration and the likelihood of cracks. Adjacent transitional zones 26, located on the circumference of the construction of the legs 16, partially define the recesses 22 between the specific constructions of the legs 16.

Each leg structure 16 is generally elliptical (oval in the example) in bottom view, reaching its maximum width in a wide central region 28 between its inner edge 30 and outer edge 32. Thus, each leg structure 16 tapers to its end in in opposite directions from the widest part of the central area 28: along the inner part 34 to the central longitudinal axis 12 and the outer edge Z0; and along the outer part 36 from the central longitudinal axis 12 to the outer edge 32.

According to the plan view from below, the tapered inner parts 34 of the structure because the legs 16 are located close to the adjacent elements on the circular base 14, like the slices of an orange.

The inner parts 34 of the leg structures 16 alternate with narrow inner sections 38 of the depressions 22 separating them, which are almost parallel, but in the example given, they widen slightly, moving away from the pentagonal central projection 18 towards the outer edge. Where they widen and pass into the outer sections 40 below the widest part of the leg structure 16, the recesses 22 widen almost exponentially between the tapered outer portions 36 of the leg structures 16 until they reach their maximum width between the outer edges 32 of adjacent leg structures 16.

Thus, moving along the recesses 22 from the central longitudinal axis 12 towards the outer diameter of the base 14, the distance between the structures 16 of the legs increases.

For comparison, in the previously existing petaloid base disclosed in EP 06711331, the distance is reduced.

When viewed from the side, the leg structures 16 are located at a level below - that is, in operation they are below - the lowest point of the base 14, defined by the pentagonal protrusion 18. All leg structures 16 are located at the same level. Thus, at this level, each leg structure defines a contact point 42 which, in a steady state, rests on a flat support surface (not shown) perpendicular to the central longitudinal axis 12 of the container 10 .

In fig. Figure 3 shows that the leg structures are egg-shaped, with the widest part of their cross-sections slightly offset inwards and downwards towards the inner edges 30.

The contact points 42 of the structures 16 of the legs are equidistant from the circle of contact centered on the central longitudinal axis 12 of the container 10. The diameter (x) of the circle of contact refers to the diameter (0) of the side wall of the container 10 as: 05x

According to the invention, K should preferably be in the range between 3.6 and 5.5, more preferably between 4.0 and 5.3, most preferably between 4.2 and 5.0, usually 4.7. This can be compared to typical

PET bottles on the market, which usually have a coefficient of K in the range from 2.5 to 3.5. A relatively large value of K of the invention is associated with a relatively small value of x. This is an advantage because the small contact circumference creates a small - and as a result significantly strong - wall between the contact points 42.

As a result, the central part of the circle of contact between the points 42 of the collision of structures 16

The legs are completely resistant to movement under internal pressure up to burst pressure. The stability of this part inside the circle of contact is enhanced by the wave-shaped section of the wall, which is defined by the inner parts 34 of the structures 16 of the legs, the depression 22 between them and the central projection 18.

Strength within the contact circumference is important not only for burst pressure cases, but also for stability because the lowest point of the central longitudinal axis (the lowest point of the base 14 in relation to the central pentagonal projection 18) tends to "push out" under internal pressure. If the lowest point touches the surface used as a support, the container will not be able to stand stably at the contact points 42 of the structures 16 legs.

The strength of the shape of the base of the invention is aimed at stability and capacity in relation to the height of the container, in comparison with already existing developments, where the distance from the central top of the base to the supporting surface is relatively small.

When considering any design of the legs 16 in the longitudinal direction (ie, from the inside of the container 10 in the direction of the central longitudinal axis 12), the outline of the designs of the legs 16 describes a practically constant radius of convexity between the radii of concavity of the transition zones 26 to each side. The traditional petaloid base has flat surfaces with M-shaped recesses between the legs to minimize material costs and stress concentration. Stress concentrations create areas in the container that are prone to cracking under high internal pressure.

The design of the base 14 of the present invention is particularly suitable for containers intended for filling liquids under pressure. In particular, a large value of K makes the base stronger and more suitable for maintaining stability while the container is subjected to high internal pressure. Moreover, as the value of K increases, it is possible that the curved central protrusion 18 will be located lower on the axis than if the container is subjected to high internal pressure. This can increase the volume of beverages that can actually be dispensed from the container 10. This advantage is discussed with reference to FIG. 12, which shows a section from the side of the base of the container 14 shown in fig. 3, as well as a beverage filling tube inside the container.

In this connection, the container is used as a beer keg 10, which is equipped with a closure device on the neck of the keg tube 10. The tube 120 connects to the closure device (not shown) and is located along the central longitudinal axis 12 near the base of the keg 10.

The lower axial end of the tube 120 is located in the central protrusion 18. The end of the tube 120 is inside the central protrusion 18 and hangs from the top of the central protrusion 18, thereby creating a circular area through which the beverage can enter from the keg 10 into the tube 120 and back . The shape of the central protrusion 18 also allows the lower axial edge of the tube 120 to be positioned correctly and secured inside the central protrusion during installation and operation.

When pouring the drink, the barrel 10 must be in a vertical position. The pressure allows the forcing gas to be introduced into the free space of the barrel 10 so that the beverage begins to pass through the tube 120. Since the axially lower edge of the tube 120 is located inside the central protrusion 18, the central protrusion 18 is in a relatively low axial position inside the barrel 10, this ensures that almost the entire volume of the drink in barrel 10 can be poured.

It is possible in the future to increase the amount of drink that can be poured from the barrel 10 by inserting the tube 120 into one of the structures 16 legs. In this case, the tube 120 will need to be shifted from the central longitudinal axis 12 to the side of its lower edge. While this may greatly increase the amount of beverage that can be dispensed from keg 10, it may also complicate the process of installing the closure device and tube 120 onto keg 10. In particular, installing a curved tube into keg 10 may require a more complex automated installation process. Moreover, the bending of the tube 120 and deviation from the central longitudinal axis 12 can subject the equipment to which the tube 120 is attached at the upper edge to uneven loads.

This can reduce the reliability of the equipment, which, in particular, applies to cases where the barrel is exposed 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 barrels. In fig. 4(a), 4(b) and 4(c) and fig. 5(a), 4(b) and 4(c) show the base of the present invention with five legs, respectively, for a bottle 44 with a volume of 0.33 liters, which is usually used for carbonated soft drinks, and for a barrel 46 with a volume 20 liters, which is usually used for beer. These drawings describe characteristics not shown in fig. 1 and 2, namely the cylindrical side wall 48, closed by the thinned part 50. The side

From the wall 48 is monolithic with and closed near the lower edge of the base 14; in turn, the side wall 48 is monolithic with and closed near the upper edge in the thinned part 50 at the top of the container.

Fig. 10 shows a base on five legs on an example of an 18-liter barrel 104 with a non-cylindrical side wall 108. In this example, the side 108 is curved relative to the axis of the central longitudinal axis of the barrel 104 and basically repeats the shape of an oval. In the lower axial part, the lateral side smoothly curves around the spherical contour of the lower base of this invention. In the upper axial part, which narrows much more than the previous one, the side wall smoothly wraps around the concave part of the barrel 104. The curved side wall 108 has a shape that maximizes resistance to internal pressure, increases the internal capacity of the barrel 104, and reduces material costs. fig. 11 is an enlarged side view of a plastic preform for blow molding the container shown in FIG. 10.

Other variants of the invention are possible without changing the concept of the invention. For example, the variant of the basis of the invention shown in fig. b(a), 6(B) and b(c), can be used in the production of bottles 52 with a volume of 1.5 liters. This variant has seven leg structures 54 instead of five and usually a multi-sided central projection 56 between them. As with the five-leg version, the seven-leg base can be used with containers of all sizes, such as 0.33 liter, 0.5 liter, 1 liter, 1.5 liter or larger bottles, as well as barrels with a volume of 20 liters, etc.

An odd number of legs is preferable to ensure optimal stability, there should be at least three legs (in this case, the central protrusion is usually in the shape of a triangle), but preferably no more than seven; the presence of five or seven legs is most preferred.

In order to combine the invention into a single whole without limiting its scope specified in the claims, the dimensions are indicated in the example. First, the table below shows the results of a comparison of the volume of a base that is normally used and a base according to the invention, while we are talking about a base with five legs. The volumes in the table are expressed in milliliters (ml). The volume refers to 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 is worth noting that the base according to the invention has a volume approximately five times larger than the volume of the traditional petaloid base of the container, as well as better parameters in terms of compactness and the use of materials for each specific volume.

Secondly, such dimensions help to determine the shape of the base for each of the above volumes of the container as: the base of the base to the side wall ktnnntyunnnnnnn VDE peneyu - ' . structures of the legs below. .

A container with five legs: and the diameter of the circle of contact with the radius of the contour of the lower base

Barrel 2 heads, where 235 mm. | i8 Yaymm | 77 996mm777 legs along the polar axis of the x axis, including the transition zones of the base of the base to the side wall of the NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNS . at. . structures of the legs below. .

A container with seven legs: and the diameter of the circle of contact with the radius of the contour of the lower base

Barrel 2 heads, where 235 mm. | i8 Yaymm | 777 996mm777 legs along the polar axis of the x axis including transition zones 00000000

Barrel 2 goals and -235mm. | // 124b0mm 7 | -( vbOhm/b

In fig. 7-9 provides additional dimensional information for a 20-liter barrel with a five-axle base 14. FIG. 10 and 11, respectively, provide information on the dimensions of an 18-liter barrel 104 with a five-axis base and initial shape.

In fig. 8 shows a partial side view through the petaloid base of the 20 liter barrel shown in fig. 7, along the MIP-MISH crossing line. The resulting cross-sectional plane partially coincides with the leg structure 16 at the point of contact 42, and it is also parallel and located radially at a distance of 50 mm from the central longitudinal axis 12 of the barrel 10. In this cross-section, the leg structure 16, its contour is a convexity with a constant radius 23.0 mm, which is located between recesses with a radius of 12.0 mm of the transition zones 26 and each side.

In fig. 9 shows a partial side section through the petaloid base of the 20-liter barrel shown in fig. 7, along the line of intersection of THEM-THEM. The cross-sectional plane formed coincides with the central longitudinal axis 12 of the barrel 10 and intersects with the same structure 16 of the leg, as shown in fig. 8 at point 42 collision. View of fig. 9 corresponds to the view shown in fig. 3, while providing the following additional information about the dimensions of the 20 liter barrel as: located inner edge of the leg structure " radially located inner edge of the leg structure " radially located inner edge and central area of the leg structure " contact circumference and inner part " located radially from and is adjacent to the contact circle " located radially outside and is adjacent to the contact circle " contact circle and outer portion " located outside and central area of the leg structure " radially located outer edge of the leg structure " located edge of the leg structure "

These radius data are also applicable to points on other structures 16 of the leg of the container 10.

These points are usually located inside any plane that coincides with both the central longitudinal axis of the container 12 and the polar axis of the specific structure of the legs 16. circle plane of contact with the "axis"

НЯ of tannins yinnnnnnnvinnynia Я of the circumference of the zone of contact (between the central projection and the structure of the leg) to the plane of the circle of contact "to the lower in the direction of the axis of the edge of the cylindrical side wall)" and the structure of the leg'

In addition to the specified dimensions, the following information obtained from pressure evaluation tests is offered, which represents the typical bursting pressure in a 20 liter barrel with a petaloid base 14 with five legs in accordance with the present invention. In comparison, pressure evaluation tests were performed with a traditional petaloid base under similar conditions. The values presented in the table indicate the bursting pressure in bars. basics (bar) inventions (bar) today, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, now, ,

Thus, it can be seen that the average bursting pressure in a 20-liter barrel with a five-leg base is approximately 8.8 bar (880 kbar). At the same time, the consumption of material per barrel of 20 liters corresponds to 0.234 kg of PETF. Accordingly, you can calculate the ratio of pressure resistance, capacity and material consumption for this 20-liter barrel:

The ratio of average pressure resistance to material consumption is 3.76 MPa/kg

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

It is clear that similar relationships can be extrapolated to containers of various shapes and sizes with the basis described in this invention.

Fig. 10 provides additional dimension information for an 18 liter barrel 104 from the bottom '

Fig. 11 provides additional information on the dimensions of the initial mold 106 for the 18 liter barrel 104 shown in FIG. 10:

Base thickness 77777771 1 mm

The length along the axis of the part of the neck below the upper part of the neck to the cylindrical lateral truncated cone)

The approximate burst pressure in this 18 liter barrel with a five leg base is approximately 14 bar (1400 kbar). Material consumption per barrel of 18 liters is 0.468 kg of PETF. Accordingly, the ratio of pressure resistance, capacity and material consumption per barrel of 18 liters can be calculated as follows:

The ratio of the average pressure resistance to material consumption - C MPa/kg

The ratio of capacity to material consumption is 41 l/kg

For a base with five legs, the following values correspond:

A barrel with a volume of 20 liters:

The length of the leg structures along the polar axis/ the width of the leg structures along the polar axis - 1.35

The diameter of the contact circle/width of the leg structures along the polar axis is 1.68

The radius of the contour of the lower base/diameter of the side wall is 0.57

The radius of the contour of the lower base/ the radius of the transition from the contour of the lower base to the side wall -272

The radial protrusion of the leg structures below the radius of the contour of the lower base/radius of the contour of the lower base - 1.13

Bottles of different volumes:

The length of the leg structures along the polar axis/width of the leg structures along the polar axis is 1.47

The diameter of the contact circle/width of the leg structures along the polar axis is 1.83

The radius of the contour of the lower base/diameter of the side wall is 0.58

The radius of the contour of the lower base/ the radius of the transition from the contour of the lower base to the side wall - 1.81

З Radial projection of leg structures below the radius of the contour of the lower base/radius of the contour of the lower base - 1.15

Similarly, a base with seven legs corresponds to the following ratios:

A barrel with a volume of 20 liters:

The length of the leg structures along the polar axis/ the width of the leg structures along the polar axis - 1.44

The diameter of the contact circle/width of the leg structures along the polar axis is 1.82

The radius of the contour of the lower base/diameter of the side wall is 0.57

The radius of the contour of the lower base/ the radius of the transition from the contour of the lower base to the side wall -2.12

The radial protrusion of the leg structures below the radius of the contour of the lower base/radius of the contour of the lower base - 1.13

Bottles of different volumes:

The length of the leg structures along the polar axis/ the width of the leg structures along the polar axis - 1.59

The diameter of the contact circle/width of the leg structures along the polar axis is 2.03

The radius of the contour of the lower base/diameter of the side wall is 0.57

The radius of the contour of the lower base/ the radius of the transition from the contour of the lower base to the side wall - 1.68

The radial protrusion of the leg structures below the radius of the contour of the lower base/radius of the contour of the lower base - 1.15

It is clear from the above description that the improved form of the petaloid base of the invention has various additional advantages. This gently curved shape without sharp corners offers better resistance to cracking. It is also important that its surface area is smaller than the surface area of known equivalents. Thus, with a given amount of polymer, the invention allows you to make the walls thicker, thus, you can get a stronger base. As an option, it is possible to reduce the weight and consumption of material while maintaining the strength of the base.

A strong base is especially important in applications where containers are subject to increased internal pressure and/or elevated temperature, such as carbonated beverages, beer, and hot or pasteurized liquids.

Claims (34)

FORMULA OF THE INVENTION 25 1. A petaloid base of a stable container having a spheroidal contour of the lower base and multiple legs of a spheroidal design, which are constructed separately from the contour of the lower base, determining the required number of legs, where the leg design diverges by a beam from a central projection; and the construction of the legs is ovoid. Zo 2. The base according to claim 1, where the contour of the lower base is a flattened spheroid, the polar axes of which coincide with the central axis of the base. 3. The base according to claim 1 and claim 2, where the contour of the lower base has a hemispherical shape. 4. The base according to claim 1 and claim 2, where the design of the legs is an elongated ellipsoid. 5. The base according to claim 4, where the structure of the legs is an elongated spheroid. 35 6. The base of each of the preceding claims, wherein the widest cross-sectional portion of each leg structure is offset inwardly toward the inner end of the leg structure. 7. A base according to any of the preceding claims, wherein the leg structures have respective longitudinal axes, these axes lying in planes radially diverging from the central axis of the base. 8. The base according to claim 7, where the axes of the leg structures are shifted outwards from the central axis of the base, 40 thus forming a cone. 9. The base according to claim 8, where the axes of the leg structures are displaced outward and upward from the central axis of the base. 10. The base according to claim 9, where the axes of the leg structures intersect at a point that lies on the central axis below the base. 45 11. A base according to any of the preceding claims, wherein each leg structure elliptically intersects the contour of the lower base. 12. The base according to claim 11, where the intersection is represented in the form of an ovoid. 13. The base according to claim 11 or claim 12, where the intersection is made in the form of a concave intersection. 14. A base according to any of the preceding claims, wherein the central projection has a radius of curvature less than 50 times the radius of curvature of the lower base curve. 15. A base according to any of the preceding claims, wherein the central projection is located at a level lower than the lowest point of the contour of the lower base. 16. A base according to any of the preceding claims, wherein the leg structure and the central projection are connected by a smoothly curved transition portion. 55 17. The base according to claim 16, wherein the leg structure, the smooth curve of the transition part and the central projection together form a wave-shaped cutting surface. 18. The base according to claim 16 or claim 17, where the transition part forms a bend, the curvature of which is different from the curvature of at least one leg structure and the central projection. 19. A base according to any of the preceding claims, wherein the central protrusion has a curved shape relative to the outer surface of the container. 20. A base according to any of the preceding claims, wherein the central protrusion forms a niche relative to the inner surface of the container, the niche being necessary for accommodating and securing the free end of the fluid supply tube within the container. 21. A base according to each of the preceding items, wherein the central protrusion is usually of a polygonal structure, with the number of sides corresponding to the number of leg structures. 22. A base according to any of the preceding claims, wherein the leg structures are separated by indentations. 23. The base of claim 22, depending on claim 21, wherein the recesses diverge from the top of the polygonal projection. 24. The base of claim 22 or claim 23, wherein the recesses extend toward the outer edge of the base. 25. The base according to claim 24, wherein each recess has an inner and outer cross-section, and the outer cross-section of the walls of the recesses can be dramatically different from the inner cross-section. 26. The base according to claim 25, where the walls of the recesses differ in both external and internal sections. 27. A base according to any of the preceding claims, wherein in plan view, each leg structure has a wide central region that tapers from the center toward an outer edge of the leg structure. 28. The base according to claim 27, wherein the inner parts of the leg structures are arranged around the base in the form of segments. 29. The base of claim 27 or claim 28, wherein in plan each leg structure tapers from a wide central region through an outer portion toward an outer end of the leg structure. 30. The stable container has the basis described in each of the previous clauses. 31. The container according to claim 30, where the structures of the legs of the base determine the corresponding points of contact, which are equidistant from the circle of contact, the diameter of which (x) corresponds to the diameter of the side wall (Оу) of the container as follows: 05x where K is in the interval between 3.6 and 5.5. 32. The container according to claim 31, where K is in the interval between 4.0 and 5.3. 33. The container according to claim 32, where K is in the interval between 4.2 and 5.0. Zo 34. The container according to each of claims 30-33, where the ratio of the average resistance of the bursting pressure to the consumption of the material is greater than 3 MPa/kg. 35. Container according to each of claims 30-34, where the ratio of capacity to material consumption is more than 40 l/kg. 36. A container according to any one of claims 30-35, which has a beverage dispensing tube which coincides with the central longitudinal axis of the container, said tube being located between the base of the container and the opening of the container. : x 26 with 16 26 and , 32 40) Z6 ' I aa» 28 and - -22 M, 0 nya, . aren stova v ihen Ya t v-: Z ky as 401 zv 16 ts i ia. 1 and Fikg.1 sig re and "6 and 26 ' 22 26 x I ; ! /, E 1 y y i 16 49 y 16 18 c, 42 16 16 4 2 Fig. 2 14 i o full mon mon ! in y ' r ; 14 ia Shchy ' ! 16 28 48 and in iv Fig. 3 r 5O 486 | yes (a) and Fo, all (c) Fig. 4 ut vo 48 la a), yeh y (c) ich ) che ra Y t-v Fig. 5 / (in 6 In (in) in sh s- y Fig. sonny KI v - 50 v: nya Mottit and (f) and 16 OS SCHE A I ; and sh SY u ach (ya, az u Fik. 7 And Gn She and speasvovnnchya ah 16 rt at 26 Fig. 8 Ші ші в У вх ник че и х ни Х и ш шш ши ЕН и БЖ" в шо у 8 Е 02 я У ; / Ann. 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