DE202019105777U1 - Plastic container with pressure-resistant bottom - Google Patents

Abstract

Plastic container (1), in particular for beverages, with a base region (2), a base body (4) adjoining this base region (2) in the longitudinal direction (L) of the plastic container (1), and a base body (4) in the longitudinal direction (L) Base body (4) at least indirectly adjoining mouth region with a container mouth, the base region (2) having at least three feet (22), characterized in that the base region (2) has at least one tension band (24) with at least one branching region (26), starting from which at least three tension band sections (24a, 24b, 24c) of the tension band (24) extend.

Description

The present invention relates to a plastic container, in particular to a plastic container with a pressure-resistant base or pressure-resistant base area and in particular to a pressure-resistant plastic container. The present invention relates in particular to a plastic container for beverages with a base region, a base body adjoining this base region in the longitudinal direction of the plastic container and an orifice region with a container mouth that at least indirectly adjoins this base body in the longitudinal direction. In particular, the floor area has at least three feet.

Plastic containers for beverages have long been known from the prior art in different sizes and filling volumes, for example from smaller filling quantities in the range from 200 ml to larger filling quantities of 2 l or large filling quantities of 5 l. Compared to glass bottles, the plastic containers are characterized by their low weight. The plastic containers are usually produced from preforms which are expanded into the plastic containers in the course of a blow molding process, for example by means of the application of a gaseous and / or liquid medium. For this purpose, the preforms are usually introduced into a blow mold and expanded relative to this blow mold.

An attempt is usually made to save as much material as possible in the production of plastic containers and at the same time to achieve high stability of the plastic container. In particular, the bottoms of the plastic containers are subject to particular challenges with regard to stability, since these serve both as standing surfaces for the containers and at the same time have to withstand higher internal pressures. From the published application DE 10 2013 101 332 A1 For example, the applicant is aware of a container base with two dome-like structures of different curvature around a gating point in the center of the base.

The present invention relates in particular to containers for so-called still water and / or slightly pressurized products. The container bottom of containers, for example also containers with higher filling volumes such as about 2.0 l, are to be further developed in such a way that the base center remains (positionally) stable even at higher internal pressures, for example of 0.4 bar or 0.6 bar, and the Pressure load on individual floor areas does not result in them having contact with the standing surface or floor level, thereby impairing the stability of the container. For example, in the case of a container base with several dome-like structures, even with a small base weight, it should be ensured that the base center does not shrink under the internal pressure and that an average dome radius is in contact with the base plate and the bottle would therefore no longer be stable.

From the devices and methods currently known from the prior art, there is the disadvantage that, with a low floor weight, a high pressure load can lead to an undesirable mobility of the center of the floor.

The present invention is based on the object of further developing the containers known from the prior art in such a way that even with a low base weight, in particular the base center withstands a high (internal) pressure load and remains stable, and thus a pressure-resistant container base is provided.

The object is achieved according to the invention by the subject matter of the independent claims. Advantageous embodiments and developments of the invention are the subject of the dependent claims.

A plastic container according to the invention, in particular for holding fluids, preferably liquids and particularly preferably for beverages, has a base region, a base body adjoining this base region in the longitudinal direction of the plastic container, and a mouth region, at least indirectly adjoining this base body in the longitudinal direction, in particular with a (closable) container mouth, the bottom area preferably having at least three feet. In an orientation of the container standing on a floor level, the feet of the container form the standing area of the container on the floor level. Preferably, in an orientation of the container standing on the floor level, its floor center or a floor center point of the floor area does not contact the floor level, but is preferably spaced from it (in the longitudinal direction). The container is preferably formed in one piece.

According to the invention, the container and in particular the base region have at least one tension band with at least one branch region, from which at least three tension band sections of the tension band extend. The three drawstring sections preferably each extend in pairs in different directions relative to one another. The drawstring is preferably suitable and intended to exert forces acting on a floor center or a floor center - such as, for example, an injection point of the container to guide the drawstring onto a side wall of the container, in particular onto a side wall of the base body. A drawstring is preferably arranged between each two feet of the container, and particularly preferably the drawstring or the drawstrings each extend between two feet.

It is proposed that the floor area have a drawstring which is not linear over its entire extent or (mathematically speaking) represents an (unbranched) space curve, but which branches at least at one point or at one area. In other words, a floor area with a drawstring is proposed in which a drawstring section branches or divides into two drawstring sections at a branching area. Such a branching region, from which (in total) at least three tension band sections extend, can advantageously bring about a force decomposition. In this way, a force that is conducted via the first tension band section can be divided into two further tension band sections that preferably conduct a force that is smaller with respect to the amount (compared to the amount of the force passed through the first tension band section).

The base region preferably has a plurality of such tension bands with at least one branch region, from which at least three tension band sections of the tension band extend. Each of these drawstrings can have any of the preferred embodiments (individually or in combination with one another), which are described below with regard to the at least one drawstring.

The longitudinal direction is in particular a direction along a central axis of the plastic container, starting from the bottom area in the direction of the mouth area. The central axis of the plastic container extends in particular (in the middle) through the (opening of) the mouth of the container and / or in particular in the center through a base region of the container, in particular through its base center and particularly preferably through a gating point. In the standing (spatial) orientation of the container, the central axis extends in particular parallel to a vertical direction. The base body is preferably used to hold the essential filling volume (of a drink).

The drawstrings preferably do not extend into an upper and in particular not into a central region (seen in the longitudinal direction) of the container, but end in the base region or just above it. The tension band preferably extends from the base center or a central region surrounding it essentially to the base body of the container or to a transition region of the base region to the base body.

Each tension band (of the bottom region) preferably has a branching region, particularly preferably exactly one branch region, from which at least three tension band sections extend (in different directions). A division and (simultaneous) forwarding of a force acting approximately on the floor center or the injection point can thus advantageously be achieved.

The at least three tension band sections of a tension band are preferably substantially linear. The (preferably all) tension band sections of a tension band essentially represent sections of a space curve (mathematically speaking) (linear). This advantageously allows forces to be conducted in an efficient manner and thus the stability of the floor area to be increased, with the appearance of the floor area only in is influenced to a small extent.

In an advantageous embodiment, the drawstring has at least one and preferably exactly one essentially Y-shaped branch. The drawstring preferably has a Y shape. The tension band preferably branches at exactly one point or exactly one branching area. However, it is also conceivable that several branching areas are provided. As a result, the forces can advantageously be distributed over an even larger wall area.

At least one tension band section and in particular exactly one tension band section preferably extends essentially within one plane, in particular within a cross-sectional plane of the container, which preferably extends through the central axis of the container. At least one tension band section preferably extends exclusively in the radial direction and / or in the longitudinal direction of the container (thus in particular has only components in the radial direction and / or in the longitudinal direction). In particular, the course of the curve along the bottom wall defines, on the one hand, the injection point and / or the center of the bottom and / or the center of the bottom and / or an adjoining area, in the radial direction and / or in the longitudinal direction of the container, a main traction line, along which (at least in sections) in particular forces acting on the injection point are directed to the side wall of the container and in particular the base body of the container. In other words, at least one of the drawstring sections of a drawstring extends at least in sections and preferably in its entirety not in the circumferential direction (based on the central axis of the container), in particular exclusively along a main traction line. The main traction line can be the geometrically shortest connecting curve running along the wall of the container between the bottom center point and / or the injection point and / or an area adjacent to it and the base body of the container, which leads through the geometric center between two predetermined adjacent feet , act.

A circumferential direction is preferably to be understood as a direction of rotation about the central axis (or longitudinal direction) (selected as the axis of rotation) of the container. A radial direction (in relation to the longitudinal direction) is understood to mean a direction in relation to the longitudinal direction (or the central axis of the container) which is perpendicular to the longitudinal direction (or the central axis) and which is in particular different from the latter (in particular from the central axis) ) outgoing (straight and in particular in a direction perpendicular to the central axis).

A weakening of the main tensile line is preferably effected by a Y shape of the tension band or by a Y splitting of the tension band. This advantageously leads to the reduction of indentations on the lower main diameter, which arise when the internal pressure and tension bands are combined.

Preferably, and in particular precisely the one tension band section, which is arranged between a center of the floor and the (at least one and in particular exactly one) branching area, is arched outwards at least in sections - in particular in an area between two feet - and preferably along its entire course. In particular, a line formed on the tension band section is considered, which lies in a cross-sectional plane through the container along the central axis.

Preferably, the at least two drawstring sections (each) of a drawstring (the bottom area) extend from the branching area in opposite circumferential directions. These are preferably two drawstring sections (each) of a drawstring which, viewed in the longitudinal direction (or in the vertical orientation of the container), are arranged above the branching region (i.e. between the branching region and the mouth region). Preferably at least two and particularly preferably exactly two drawstring sections of a drawstring are essentially symmetrical with respect to one another with respect to a plane through the central axis of the container and the branching area.

Preferably, a force directed via a first (in the case of a standing arrangement of the container, in particular the lower) tension band section is at least partially directed onto the at least two (upper) tension band sections. Such a force decomposition is preferably carried out symmetrically. Preferably, at least one tension band section is subjected to a force that is essentially the same in magnitude as at least one further tension band section of a tension band.

Preferably, the at least two tension band sections (in particular at least) enclose an angle of at least 15, preferably an angle of at least 30 ° and particularly preferably an angle of at least 90 ° in the region adjacent to the branching region.

The tension band preferably has a branch in at least and preferably exactly two tension band sections extending from the main tension line in the circumferential direction (in relation to one another). The Y splitting of the drawstring has the advantage that the main draw line between the two drawstring sections is weakened.

In a further advantageous embodiment, the plastic container has in a, in particular middle, region between (viewed in the circumferential direction) two tension band sections, which are preferably (in a standing orientation of the container) above the branching region, and in particular in a region between the branching region and the Base body, an inward curvature, especially when there is an internal pressure in the container, which is below a predetermined internal pressure value. The curvature is preferably most pronounced in the region of the geometric center (seen in the circumferential direction) between the two tension band sections. The provision of an inwardly curved area offers the advantage that, in principle, an enlargement of the interior of the container can be achieved, for example, by a complete or partial outward curvature of this area.

A circumferential line, which is formed by an intersection of the bottom region with a cross-sectional plane perpendicular to the central axis of the container, has a curvature inwards in the region between two tension band sections of a tension band (into the interior of the container). This circumferential line preferably has an outward curvature in the region of a tension band section and particularly preferably in the region of each tension band section.

Preferably, the outer surface of the bottom area is arched outwards at least in sections and preferably along the entire tension band section along a (in particular each) tension band section which is (in the standing orientation of the container) above the branching area.

In a further advantageous embodiment, at least two tension band sections of a tension band include at least one and preferably exactly one floor stabilization area for stabilizing the floor center point with respect to the longitudinal direction and / or limit at least one and preferably exactly one floor stabilization area for stabilizing the floor center point with respect to the longitudinal direction. The floor stabilization area has at least a first and a second dimensionally stable state, a transition from the first state to the second state causing an increase in the volume of the plastic container.

The container preferably has a plurality of such soil stabilization areas, particularly preferably at least one and preferably exactly one soil stabilization area is provided for each tension band and / or for each branch area of a tension band.

The soil stabilization area preferably acts as a deformation surface which, in particular when a predetermined pressure is reached or when a predetermined (resulting) pressure acts on the soil stabilization area, brings about a volume increase through (targeted) deformation. In this way, an equalization of internal bottle pressures, for example in N2 applications, is brought about by the soil stabilization area as a “deformation surface”, which generates volume increase through targeted deformation when an initial pressure is reached and thereby slow the further pressure increase.

In a further advantageous embodiment, at least one tension band section and particularly preferably at least two tension band sections of a tension band have an inwardly directed curvature profile. This is preferably at least one of the and preferably both upper drawstring sections (which are arranged in the upright orientation of the container above the branching area). The inward curvature of the tension band section is preferably arranged in an upper region and particularly preferably in an end region of the tension band section (in each case).

Preferably, at least one upper tension band section and particularly preferably two upper tension band sections have a varying curvature. Preferably, at least one upper tension band section and particularly preferably two upper tension band sections have a curvature course which is directed outwards in a first (in particular lower) area and which is preferably directed inwards in a second (in particular upper) area. In other words, the tension band section (in each case) bulges outwards in a first, in particular lower area, while the tension band section curves inwards in a second, in particular upper area. Preferably, at least one upper tension band section and particularly preferably two upper tension band sections have a region in which the curvature of a line formed on the tension band section is reversed.

The provision of an inwardly bulging region of the drawstring section offers the advantage that this weakens the main drawline. A slightly additional curvature / curvature on the respective tension band section extends this area slightly, whereby a tension build-up is brought about or tension build-up preferably starts along the two (respective) tension band sections. This relieves the main traction line (preferably the line along the geometric center between the two drawstring sections) or the main traction line "helps" only later to avoid contact between the ground center and the contact patch.

In a further advantageous embodiment, at least one and preferably exactly one groove is provided in the floor area between each two adjacent feet. This groove preferably occupies less than 1/3, preferably less than 1/4 and particularly preferably less than 1/5 of the circumferential angle that a pedestal occupies. The groove preferably extends in the radial direction and in particular not in the circumferential direction. The provision of a groove between the feet offers the advantage that by dividing the feet or feet by (narrow) grooves, wrinkling under internal pressure, in particular at an internal pressure of 0.1-1.5 bar and particularly preferably at one Internal pressure of 0.6 bar, is reduced.

In a further advantageous embodiment, the bottom area has at least two, preferably at least three, preferably at least four drawstrings and particularly preferably at least six drawstrings, each with at least one branching area, from which at least three drawstring sections of the respective drawstring extend, and / or the bottom area at least has two, preferably at least three and particularly preferably at least four soil stabilization areas.

The floor area preferably has at least six and particularly preferably exactly six tension bands, each of which has a branching area in Y shape, and in particular has at least six and particularly preferably exactly six floor stabilization areas. With such a floor (six tension bands and six floor stabilization areas) it could be shown that the greatest movement of the floor took place with an internal pressure range up to 0.2 bar, while the movement of the floor center in the range between 0.2 and 0.7 bar internal pressure was stable.

The floor area preferably has more than three, preferably more than four, preferably more than five and particularly preferably more than seven feet. The floor area preferably has less than ten, preferably less than eight, preferably less than six and particularly preferably less than four feet. The container preferably has a petaloid base.

The base body has, in particular, a (side) wall that runs completely in a circumferential direction. The base body can have an essentially circular (preferably circular cross-section (with a predetermined main diameter, cross-section when cut in a plane perpendicular to the central axis). However, it is also possible for the base body to have an essentially square or rectangular cross-section, in particular with rounded corners.

The circumferential angle is preferably understood to mean an angle in the circumferential direction around the central axis after a projection into a plane perpendicular to the central axis.

The container preferably has a filling volume (of a beverage) of at least 0.1 l, preferably at least 0.2 l, preferably at least 0.3 l, preferably at least 1 l, preferably at least 1.5 l, preferably at least 2 l, preferably at least 3.5 l and in particular at least 5 I. The container preferably has a maximum filling volume of 5 l, preferably 3.5 l, preferably 2 l, preferably 1.5 l, preferably 1 l. The container preferably has a filling volume in a range between 2 l and 3.5 l.

These are preferably so-called lightweighting bottles or containers, which have a (filling or internal) volume of at least 0.5 I, preferably at least 1 I and particularly preferably at least 2 I and are preferably produced from a plastic preform which is a Has a weight of less than 40 g and preferably less than 35 g and particularly preferably a weight of 27.5 g, and / or wherein the container has a base weight (ie weight of the base area) of less than 7 g and preferably less than 6 g and particularly preferably has a soil weight of essentially 5.5 g. The container preferably has a weight of less than 40 g, preferably less than 35 g and particularly preferably a weight of 27.5 g.

The present invention is further directed to a plastic container, in particular for beverages, with a base region, a base body adjoining this base region in the longitudinal direction of the plastic container and an orifice region adjoining this base body in the longitudinal direction at least indirectly, in particular with a container mouth, preferably the Floor area has at least three feet around a center of the floor.

According to the invention, the floor area has at least one floor stabilization area for stabilizing the floor center point (and / or an injection point of the container and / or the floor center) with respect to the longitudinal direction, the floor stabilization area having at least a first and a second, in particular dimensionally stable, state, a transition from the first state to the second state causes an increase in volume of the plastic container. The plastic container proposed here according to the invention (or a preferred embodiment hereof) can be equipped individually or in combination with all of the features described in connection with the plastic container described above, and vice versa. In particular, the elements and / or areas identified in the same way are preferably identical and / or elements and / or areas having the same effect. The soil stabilization area preferably works as a "crack frog".

In particular, the first state of the soil stabilization area corresponds to a first (predetermined) volume of the container and / or the second state of the soil stabilization area corresponds to a second (predetermined) volume of the container.

It is hereby proposed that with the provision of a soil stabilization area by reaching the second state, for example caused by an increase in the internal pressure of the container through targeted deformation of the container and in particular the base area, compared to the volume of the container when the first state of the soil stabilization area is present, volume increase is generated and this slows down a further increase in internal pressure.

Stabilizing the bottom center (and / or a splash point of the container and / or the bottom center) with respect to the longitudinal direction is preferably understood to mean that the position or position of the bottom center relative to a predetermined, fixed reference point on the center axis of the container (essentially) constant and / or largely constant and / or deviates only within a predetermined tolerance range. In particular, the center of the bottom remains stable under the action of force on the container, which causes the transition from the first state to the second state of the bottom stabilization region.

The volume increase caused by the transition from the first state to the second state is preferably, at least partially and preferably essentially completely, brought about by a deformation of at least one soil stabilization area and preferably through all soil stabilization areas. The transition from the first state to the second state of the (each) soil stabilization region (at least in sections and preferably in the entire region) preferably changes its curvature and / or curvature.

In the first state, the soil stabilization area preferably has an inward curvature (into the interior of the container). In the second state, the soil stabilization area preferably has an outward curvature. The first state of the soil stabilization range is preferably at an internal pressure (and normal atmospheric pressure of the atmosphere outside the container) selected from a range between 0.05 bar and 0.35 bar, preferably between 0.05 bar and 0.3 bar and particularly preferably between 0.1 bar and 0.2 bar. The second state of the soil stabilization region is preferably present at an internal pressure (and normal atmospheric pressure of the atmosphere outside the container) which is higher than 0.2 bar, preferably higher than 0.35 bar, preferably higher than 0.4 bar, preferably is higher than 0.45 bar, preferably higher than 0.5 bar and particularly preferably higher than 0.7 bar.

A floor area with at least one and preferably a plurality of such floor stabilization areas (e) offers the advantage that the floor area can withstand an internal pressure of 0.4-0.5 bar and preferably an internal pressure of 0.7 bar and the container with this floor ( area) is stable. In particular, with such internal pressures, the bottom center of the container is sufficiently stable and in particular does not shrink out in such a way that it contacts the bottom plane or a bottom plate on which the container stands.

The increase in volume advantageously means that the targeted deformation of the container, in particular in the soil stabilization area, means that the position or arrangement of the center of the base and / or a point of injection of the container and / or the center of the soil relative to the longitudinal direction and / or relative to the mouth of the container, in particular when subjected to forces the container, which causes the transition from the first state to the second state, remains largely unchanged and a lowering of the center of the floor and / or of the injection point and / or of the center of the floor is prevented and / or reduced. As a result, the stability of the container as a whole can be ensured.

In an advantageous embodiment, the soil stabilization area is designed and determined in such a way that a transition from the first state to the second state takes place at a predetermined pressure (in particular resulting) acting thereon, in particular internal pressure of the container. A deformation of the soil stabilization area and / or an increase in volume of the container preferably begins essentially from this predetermined (in particular resulting) pressure, in particular internal pressure. This predetermined (in particular resulting) pressure and in particular internal pressure (at normal atmospheric pressure of the atmosphere outside the container) is preferably at least 0.2 bar, preferably at least 0.3 bar and particularly preferably at least 0.35 bar. This predetermined (in particular resulting) pressure and in particular internal pressure (with normal atmospheric pressure of the atmosphere outside the container) is preferably less than 0.5 bar, preferably less than 0.4 bar.

The first state and / or the second state of the soil stabilization region is preferably a stable state. However, the first state and / or the second state can also be a metastable state. It is also conceivable that the first state is a metastable state and the second state is a stable state. The terms “stable state” and “metastable state” refer to a shape stability of the soil stabilization area (with regard to deformation, for example caused by an increase in internal pressure).

The soil stabilization area preferably acts as a deformation surface which, in particular when a predetermined pressure is reached or when a predetermined (resulting) pressure acts on the soil stabilization area, brings about an increase in volume by (targeted) deformation of the soil stabilization area.

The container preferably has a plurality of such soil stabilization areas. These can be equipped individually or in combination with all of the features described above in connection with the at least one soil stabilization area.

The floor area preferably has at least one tension band, which includes the at least one and preferably exactly one floor stabilization area (at least in some areas and preferably completely) and / or which has at least one and preferably exactly one floor stabilization area, at least on one side and preferably on at least two sides , in particular limited by at least two drawstring sections of the drawstring.

The present invention is further directed to a bottom blow mold for producing a bottom area of plastic containers with an inner wall, against which a plastic preform can be expanded into a plastic container as part of a blow molding process. A blow molding device can be provided which has the bottom blow mold and by means of which a plastic container can be produced from a plastic preform in the course of a blow molding process.

According to the invention, the inner wall (the bottom blow mold and / or the blow molding device) has a contour which is suitable and determined, the bottom region of a plastic container with all the features described above in connection with one of the plastic containers (or a preferred embodiment of this plastic container), alone or in combination with each other.

The blow molding device is preferably suitable and intended to produce a plastic container which, with all the features described above in connection with one of the plastic containers, can be designed or is designed only or in combination with one another.

• 1a -1c Simulationsergebnisse eines erfindungsgemäßen Kunststoffbehältnisses entsprechend einer Ausführungsform mit jeweils verschiedenem Innendruck;
• 2 eine vereinfachte Darstellung des Zugbands eines erfindungsgemäßen Kunststoffbehältnisses in einer Ausführungsform gemäß 1a-1c;
• 3 eine vereinfachte Darstellung der Schwächung der Hauptzuglinie in dem erfindungsgemäßen Kunststoffbehältnis;
• 4 eine schematische Darstellung der Schwächung der Hauptzuglinie bei einem erfindungsgemäßen Kunststoffbehältnis;
• 5 eine Strichliniendarstellung einer Bodenblasform entsprechend einer Ausführungsform der vorliegenden Erfindung.
• 6 a, b jeweils eine Strichliniendarstellung eines unteren Bereichs eines erfindungsgemäßen Kunststoffbehältnisses entsprechend einer Ausführungsform.

Further advantages and embodiments result from the attached drawings:

• 1a - 1c Simulation results of a plastic container according to the invention in accordance with one embodiment, each with a different internal pressure;
• 2 a simplified representation of the drawstring of a plastic container according to the invention in one embodiment according to 1a-1c ;
• 3 a simplified representation of the weakening of the main traction line in the plastic container according to the invention;
• 4 a schematic representation of the weakening of the main traction line in a plastic container according to the invention;
• 5 a dashed line representation of a bottom blow mold according to an embodiment of the present invention.
• 6 a, b in each case a dashed line representation of a lower region of a plastic container according to the invention in accordance with an embodiment.

The 1a - 1c each show a section of simulation results of a plastic container according to the invention 1 according to an embodiment with different internal pressures. The reference number 4 identifies a basic body 4 of the plastic container 1 , on which a floor area is preferred (in particular directly) 2 of the plastic container 1 followed. The floor area preferably borders 2 completely on the basic body 4 of the plastic container 1 on.

The reference number M indicates the central axis of the plastic container 1 , The longitudinal direction L extends along this central axis M , preferably starting from a floor area 2 of the plastic container in the direction of an opening area and / or an opening of the container 1 , or in the upright orientation of the container. The reference number U indicates a circumferential direction, which is a direction of rotation about the central axis M of the plastic container 1 as the axis of rotation.

The reference numbers 22 each mark a base of the container 1 , The feet preferably form 22 a container 1 a standing area which, for example, is in an orientation of the container standing on a base plate or on a (base) plane E. 1 forms a contact area with the base plate or (floor) level E. The floor area preferably has 2 a container 1 a variety of feet 22 on. The feet 22 are preferred in the circumferential direction U evenly spaced.

The reference number 28 indicates a soil stabilization area proposed according to an alternative according to the invention. In the 1a - 1c should the shown dashed line in the middle of the respective figure with the reference symbol 25 the curvature of the soil stabilization area 28 demonstrate. The soil stabilization area 28 acts here as a "deformation surface". This Mode of action is in the in the 1a - 1c illustrated simulation results.

1a shows the simulation result at a container or bottle pressure of (here) 0.05 bar (with N2 application). Here lies how 1a there is no deformation of the soil stabilization area 28 , which here corresponds in particular to a deformation surface.

1b shows the simulation result of the plastic container (from 1a ) at a container or bottle pressure of (here) 0.35 bar. The start of the major deformation can already be seen here. It can already be seen here that the curvature or curvature of the soil stabilization area 28 changes. There is already a middle area of the soil stabilization area 28 from an initial inwardly curved surface or wall (as in 1a ) deformed towards an outwardly curved surface or wall.

1c shows the simulation result of the plastic container (from 1a and 1b ) at a container or bottle pressure of (here) 0.5 bar. At this internal pressure, the deformation potential is largely complete. Compared to the state of deformation in 1b is the curvature or curvature of the deformation surface, here the soil stabilization area 28 , more pronounced here.

Due to the soil stabilization areas designed as so-called deformation surfaces 28 , of which preferably not only one as in the 1a - 1c but there is a large number and which, when a (in particular the same, predetermined) initial pressure is reached, generate volume growth through targeted deformation and thereby slow the further increase in pressure. The provision of such deformation surfaces can advantageously bring about an equalization of bottle internal pressures in N2 applications.

At the soil stabilization area 28 this is a Y tension band surface, in particular a surface (of the floor area) which is (at least partially) bounded and / or surrounded by a Y-shaped tension band and / or adjoining it. Two drawstring sections delimit here 24 b . c a (Y-shaped) drawstring 24 the soil stabilization area 28 (see also 3 ). The soil stabilization range preferably borders 28 to the branch area 26 (not marked here; see about 3 ) (especially immediately). The container ( 1a ) constructed in such a way that in an (initial) state there is no deformation and in this state the curvature in the middle of the Y tension band surface (compared to a state with a formed deformation) is preferably shifted into the interior of the container and in particular one after it has curvature on the inside. The drawstrings are preferred 24 a Y shape, the area of the Y (soil stabilization area 28 ) works here as a "frog".

2 shows a simplified representation of the drawstring 24 of a plastic container according to the invention in the embodiment according to 1a - 1c , Illustrated in particular 3 a simplified representation of the Y splitting of the drawstring 24 with weakening of the main train line 28 (in 3 not marked; compare 4 ) to reduce indentations on the lower main diameter, which result from a combination of internal pressure and tension bands.

The drawstring 24 shows the three drawstring sections 24a . 24b and 24c on. The three drawstring sections here 24a . 24b and 24c extend from the branch area 26 in three different directions. The drawstring sections 24a . 24b and 24c meet in the branching area 26 , Conversely, it branches in the radial direction and not in the circumferential direction U extending tension band section 24a from the branch area 26 (which is punctiform here) in the two each preferably in the circumferential direction U - In particular in the opposite direction) extending two tension band section 24a and 24b , Between these two, especially in the circumferential direction U extending and preferably above (seen in the vertical orientation of the container) the branching area 26 arranged two drawstring sections 24a and 24b is preferably the soil stabilization area 28 arranged.

The 3 shows a simplified representation of the weakening of the main traction line in the plastic container according to the invention of the embodiment of the container according to 2 , The main train line is in 3 identified by the reference symbol 25 and represented by a dashed line. The main train line 25 preferably represents a line of the drawstring section that is continued or extended upward (with the container in a standing orientation) along the bottom wall 24c The main train line 25 runs here and particularly preferably along the geometric center between the two (upper) tension band sections 24b and 24c , The main train line preferably extends 25 not in the circumferential direction U ,

A slight additional curvature / curvature on the in 1a white dashed line, identified by the reference symbol 25 (Main train line) extends this area slightly, which means that the tension build-up preferably along the outer Y-lines, namely the (upper) drawstring sections 24c and 24b , starts along. Only later (especially with higher internal pressure compared to floor areas with tie straps without branching (in Y-shape) and / or compared to floor areas with themselves not in the circumferential direction U extending tension band or tension bands) "helps" the main traction line with it, a contact of the ground center 8th with the footprint or the floor level e to avoid.

4 shows a schematic representation of the weakening of the main traction line in a plastic container according to the invention. 4 represents a schematic diagram to clarify that the through the (lower) drawstring section 24a guided forces at least partially and preferably evenly on the two (upper) tension band sections 24b and 24c , in which the (lower) drawstring section 24a branched to be divided. A comparatively smaller proportion of the forces is over the main train line 25 directed. Only with larger forces, which along the (lower) tension band section 24a (and which, for example, from the soil center 8th on the (lower) drawstring section 24a the main train line "helps" 25 with, and also guides forces to the side wall of the base body 4 or to the body line GL further, which in particular the boundary line of the base body 4 to the floor area 2 of the container 1 represents.

Is preferred between the two (upper) tension band sections 24b and 24c and especially the body line GL a soil stabilization area 28 arranged and is particularly preferably limited by these. A soil stabilization area is preferred 28 along the main train line 25 arranged.

The soil stabilization area is preferred 28 suitable and intended to act like a crack frog and in particular to have two states with different curvatures or curvatures. The states are preferably at least one metastable state or one stable state. The soil stabilization area is preferred 28 suitable and determined for this, at a given, from the inside of the container towards the outside towards the soil stabilization area 28 acting (resulting) force from one state to another state (especially in the form of a cracked frog).

5 shows a dashed line representation of a bottom blow mold 100 according to an embodiment of the present invention. Here is this bottom blow mold 100 suitable and intended for this, in particular by means of its inner wall 102 a floor area 2 to produce a plastic container (as part of a blow molding process, in particular an expansion process), the feet 22 has and at least one (in particular branching) drawstring 24 which has at least three drawstring sections 24a . 24b . 24c , having. The drawstring preferably has 24 a Y-shape and in particular a Y-shaped branch area. For this purpose, the bottom shape has Y-shaped contour sections 124a . 124b and 124c which in particular have exactly one branch area. The bottom blow mold preferably has 100 a center point M 'of the bottom blow mold, in particular corresponding to an injection point of a container to be produced 1 , In the 5 shown contour 102 the bottom blow mold 100 also shows the inner wall sections producing the feet 122 the bottom blow mold 100 ,

The two 6 a and b show - in broken line representation - different views of a lower area of a plastic container according to the invention 1 according to one embodiment. Here is the floor area 2 of the container 1 shown and from the main body 4 of the plastic container 1 only a very small lower area can be seen. The same reference numerals designate the same elements or sections of the container in the two figures. 6a shows a view obliquely from below of the floor area 2 of the container while 6b a side view of the container (focusing on the bottom area 2 ) shows. In both figures, the reference number indicates M a center of the floor and the reference symbol 22 one stand each. How out 6a can be seen, the floor area shown 2 a total of six feet 22 on, between two adjacent feet 22 one (radially from the center of the floor M groove extending outwards 32 is arranged. Two adjacent feet each 22 are through a groove 32 separated from each other. The feet 22 jointly define a standing surface which, in the standing orientation of the container, contacts a floor level on which the container stands.

To promote stability of the floor area 2 of the container (in particular also of the center of the bottom when the container is filled), a tension band is provided which (in particular in the longitudinal direction of the container) forces acting on the center of the bottom along the tension band, which in particular by a (each) groove 32 runs, (at least partially) along the bottom region wall (in particular mainly and particularly preferably in the radial direction outwards with respect to the longitudinal axis or central axis of the container) in the direction of the base body 4 passes on until the forces preferentially from an edge region of the base region 2 to the basic body 4 or that body 4 recorded and from there preferably (in particular essentially uniformly) distributed in several directions (in particular in a circumferential direction).

In the in the 6a and b embodiment shown, the drawstring, here in each case, has a branching area 26 on (which can in principle be punctiform or flat) on which the tension band section 24 a in two drawstring sections 24 b and 24 c branched. The floor area 2 (In particular, each groove between two adjacent feet) thus has a lower groove area in which the tension band is (still) unbranched, that is, in which the tension band in the circumferential direction U seen preferably only a drawstring section 24a has, and / or in which the (main) direction of extension of the tension band substantially not in the circumferential direction U of the container runs (but following the container wall in a radial direction towards the outside in relation to the longitudinal axis through the center of the bottom).

The floor area preferably has 2 (in particular each groove between two adjacent feet) has an upper groove area which preferably adjoins the lower groove area and / or between the lower groove area and the base body 4 is arranged. The tension band is preferably branched in this upper groove region, that is to say is preferably in the circumferential direction U seen at least two drawstring sections (identified by the reference numerals 24 b and 24 c ) in front. At least one tension band section preferably extends 24b . 24c and particularly preferably at least two (and particularly preferably all) tension band sections extend 24b . 24c in the upper groove area (at least in sections) (also) in the circumferential direction U of the container.

Is preferred in the upper groove area and / or (in the circumferential direction U of the container) between (preferably the and particularly preferably exactly) two tension band sections 24 b . c A soil stabilization area (preferably in each case) 28 arranged. Target of the soil stabilization area 28 is to serve as a pressure compensation and / or force compensation area and / or volume adjustment area. So a (targeted) deformation of the soil stabilization area 28 (at least in some areas or over the entire surface) a volume change (volume increase or volume reduction of the container) is brought about and this results in a change in the internal pressure of the (closed) container.

In addition, by deforming the soil stabilization area, forces that act on the center of the soil can be balanced and / or reduced. Deformation of the soil stabilization area is preferred 28 triggered by exceeding and / or falling below a predetermined internal pressure (threshold) range and / or internal pressure (threshold) value (due to the design of the container).

The applicant reserves the right to claim all of the features disclosed in the application documents as essential to the invention, provided that they are new to the prior art, individually or in combination. It is further pointed out that features that may be advantageous in themselves were also described in the individual figures. The person skilled in the art immediately recognizes that a certain feature described in a figure can be advantageous even without the adoption of further features from this figure. The person skilled in the art also recognizes that advantages can also result from a combination of several features shown in individual or in different figures.

LIST OF REFERENCE NUMBERS

1

Plastic container

2

floor area

4

body

8th

Floor center / Floor Center

22

stand

24

tieback

24a, b, c

Zugbandabschnitt

25

Hauptzuglinie

26

junction area

28

Ground stabilization area

32

groove

100

Bodenblasform

102

inner wall

124

Blow molding section for pedestal

e

ground level

GL

Body line

HL

line

L

longitudinal direction

M

Floor center

M '

Center of the bottom blow mold

U

circumferentially

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102013101332 A1 [0003]

Claims (10)

Plastic container (1), in particular for beverages, with a base area (2), a base body (4) adjoining this base area (2) in the longitudinal direction (L) of the plastic container (1), and a base body (4) in the longitudinal direction (L) Base body (4) at least indirectly adjoining mouth area with a container mouth, the bottom area (2) having at least three feet (22), characterized in that the bottom area (2) has at least one tension band (24) with at least one branching area (26), starting from which at least three tension band sections (24a, 24b, 24c) of the tension band (24) extend. Plastic container (1) after Claim 1 , characterized in that the tension band (24) has a substantially Y-shaped branch. Plastic container (1) according to at least one of the preceding claims, characterized in that the plastic container in an, in particular middle, area between two tension band sections (24b, 24c), and in particular in an area between the branching area (26) and the base body (4) , has an inward curvature. Plastic container (1) according to at least one of the preceding claims, characterized in that at least two tension band sections (24b, 24c) of a tension band (24) have at least one and preferably exactly one floor stabilization area (28) for stabilizing the floor center point (M) with respect to the longitudinal direction (L ) include and / or limit, the soil stabilization area (28) having at least a first and a second state, a transition from the first state to the second state causing an increase in volume of the plastic container (1). Plastic container (1) according to at least one of the preceding claims, characterized in that at least one tension band section (24b, 24c) and particularly preferably at least two tension band sections (24b, 24c) of a tension band (24) has an inwardly directed curvature course. Plastic container (1) according to at least one of the preceding claims, characterized in that at least one groove (32) is provided in the base region (2) between each two adjacent feet (22). Plastic container (1) according to at least one of the preceding claims, characterized in that the bottom region (2) has at least two, preferably at least three, preferably at least four drawstrings (24) and particularly preferably at least six drawstrings (24), each with at least one branching region (26 ), from which at least three tension band sections (24a, 24b, 24c) of the respective tension band (24) extend, and / or the floor area (2) has at least two, preferably at least three and particularly preferably at least four floor stabilization areas (28). Plastic container (1), in particular for beverages, with a base region (2), a base body (4) adjoining this base region (2) in the longitudinal direction (L) of the plastic container (1), and a base body (4) in the longitudinal direction (L) Base body (4) at least indirectly adjoining mouth area with a container mouth, the floor area (2) having at least three feet (22) around a floor center point (M), characterized in that the floor area (2) has at least one floor stabilization area (28) for stabilizing the Floor center point (M) opposite to the longitudinal direction (L), the floor stabilization area (28) having at least a first and a second dimensionally stable state, a transition from the first state to the second state causing an increase in volume of the plastic container (1). Plastic container (1) according to the preceding claim, characterized in that the soil stabilization area (28) is designed and determined in such a way that a transition from the first state to the second state takes place at a predetermined pressure acting thereon. Bottom blow mold (100) for producing a bottom region (2) of plastic containers (1) with an inner wall, against which a plastic preform can be expanded into a plastic container (1) as part of a blow molding process, characterized in that the inner wall (102) has a contour, which is suitable and intended to produce the base region (2) of a plastic container (1) according to at least one of the preceding claims.

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