WO2019048517A1

WO2019048517A1 - Plastic container

Info

Publication number: WO2019048517A1
Application number: PCT/EP2018/073937
Authority: WO
Inventors: Milena HUBER
Original assignee: Krones Ag
Priority date: 2017-09-06
Filing date: 2018-09-06
Publication date: 2019-03-14
Also published as: DE102017120457A1

Abstract

The invention relates to a plastic container (1) for receiving beverages, comprising a mouth (60), a wall section (50) connecting to said mouth (60) in a longitudinal direction (L) of the plastic container (1), and a bottom section (40) comprising a peripheral, uninterrupted standing surface (10), the plastic container (1) being embodied preferably as one piece. According to the invention, the bottom section (40) comprises at least one standing surface step (11) which particularly extends all the way around the periphery, is connected to the standing surface (10) at least in sections and is arranged radially inside in relation to said surface, at least one curved first reinforcing region (30) extending at least in the peripheral direction (U) being connected to the standing surface step (11), and at least one second reinforcing region (20) extending in the peripheral direction (U) being connected to the curved first reinforcing region (30), at least in sections in the peripheral direction (U), the first reinforcing region (30) and the second reinforcing region (20) merging into each other, at least in sections, by means of a stepped transition section (24, 22).

Description

Plastic container

description

The present invention relates to a plastic container, in particular for receiving drinks. Such containers are known from the prior art for some time and increasingly supplement glass bottles as beverage containers. These beverage containers offer, in particular, the advantage in their comparatively lower weight, greater freedom with respect to their design and, in part, their multiple usability. From the prior art, various bottles of various sizes for both small quantities in the range of 200 ml to large quantities of 5 I are known. These containers have a variety of forms. In the context of manufacturing processes, preforms are inflated or expanded with flowable medium, for example liquid or gaseous medium, to the plastic containers. For this purpose, preforms are usually introduced into a blow mold and expanded with respect to this blow mold. At the bottoms of plastic containers special requirements are made in terms of their design, as these act on the one hand as a stand areas for the containers, on the other hand to withstand higher internal pressures and at the same time should be produced as gentle as possible. Typically, the bottoms of the PET containers of the prior art, which are designed for internal pressure up to 0.5 bar, characterized by ribs or Zugbandgeometrien, which are visible in a side view. alternative Soils that do not use rib geometries, such as the star floor or the champagne floor, are usually not stable inside pressure.

From the devices and methods which are currently known from the prior art, there is the disadvantage that consumers on the part of plastic containers with a "glass-like look" are desired, ie containers on the side wall of the soil there are no ribs or similar elements These soils should not require too much material, should be able to be blown well and, if necessary, withstand a slight internal pressure, for example due to fermentation of the contents or the addition of nitrogen in the headspace Therefore, such optical defects as occur in the prior art during container manufacture are likewise to be avoided to the greatest extent possible The object of the present invention is to overcome the disadvantages known from the prior art and to achieve a high level provide qualitative plastic container with a bottom design, which ensures both stability-enhancing side elements both sufficient stability and internal pressure resistance of the plastic container obtained, but at the same time still offers good formability with minimized use of material during its blow molding.

The object is achieved by the subjects of the independent claims. Advantageous embodiments and further developments of the invention are the subject of the dependent claims.

A plastic container according to the invention for receiving drinks has an orifice and a wall section adjoining this orifice in a longitudinal direction of the plastic container and a bottom section (adjoining the wall section), which has a circumferential section (at least partially in FIG Circumferential direction) has not interrupted footprint. In this case, the plastic container is preferably formed in one piece.

The circumferential direction is here and below as a direction of rotation with respect to the central axis of the plastic container or about this central axis and / or with respect to to understand a rotation axis (the basic construction) of the container. The axis of rotation preferably runs along the central axis of the container. However, the central axis does not have to be located centrally within the container or along the axis of rotation of the bottle body. The longitudinal direction of the container is preferably parallel to the central axis or the axis of rotation. The bottom section preferably has an injection point, which is located in a radial direction on the outer wall of the container. Furthermore, the bottom section preferably has a central region, which preferably surrounds this injection point (and / or particularly preferably a center or centrally arranged floor center). The term radial or in the radial direction is understood here and below with respect to the center axis of the plastic container and / or with respect to a rotation axis (the basic construction) of the container.

In this case, the plastic container may be a PET container. It is preferably a container with a filling volume of at least 0.2 l, preferably at least 0.3 l, preferably at least 0.5 l, preferably at least 1 l and preferably at least 1.5 l and / or preferably with a filling volume of a maximum of 1 l, preferably a maximum of 6 l, preferably a maximum of 3 l and preferably a maximum of 2 l.

According to the invention, the bottom section has at least one, preferably exactly one, adjoining the standing surface at least in sections (preferably completely and / or preferably immediately), with respect to this radially inward, in particular (with respect to the circumferential direction) fully formed footwell step, wherein the Stand surface step, preferably at least in sections, at least one circumferentially extending, curved first gain region (indirectly or directly) adjoins and preferably connect a plurality of circumferentially extending curved first gain regions, and at the and preferably at each curved first gain region at least partially in Circumferentially connected at least one circumferentially extending second reinforcing region (indirectly or directly). In this case, the first reinforcement region and the second reinforcement region merge into one another at least in sections via a step-shaped or step-like transition section. The presently proposed bottom section advantageously represents an alternative bottle bottom to the previous star floors or even champagne bottoms. The bottom section proposed according to the invention offers the advantage that it does not have or require ribs or pull straps that fit into the side wall of the container. It is advantageous to a stamp base that combines the marketing requirements of the consumer or the consumer-specific requirements and technical features such as improved material distribution and internal pressure resistance to about 0.2 bar.

In other words, the bottom section has at least one first reinforcement region and preferably a plurality of first or a plurality of first reinforcement regions which are radially further inward, ie closer to the center axis and / or opposite the base surface and preferably also opposite the (completely circumferential) foot plane. or an axis of rotation of the container, and particularly preferably arranged in the radial direction between the support surface and the central region and / or the injection point is or are arranged. Preferably, the at least second reinforcing region or the (all) at least second reinforcing regions or the plurality of second reinforcing regions is (also) radially within the standing surface and preferably also within the standing surface step and particularly preferably in the radial direction between the base surface and the central region and / or the injection point. In this case, the (all) first amplification regions and / or the (all) second amplification regions, in particular in the radial direction, in particular transition tangentially into the central region. The second reinforcement regions preferably extend further radially in the direction of the central axis than the first reinforcement regions. In this case, the second reinforcing regions (in comparison with a basic construction of a double-shaped bottom section without reinforcing regions) can project in a radial direction into the central region. Preferably, therefore, a (radially inwardly arranged) section of a second reinforcement region can be surrounded by the central region in the circumferential direction. Preferably, neither a first reinforcement region nor a second reinforcement region breaks through or breaks the base surface and / or the footprint step.

The second reinforcing region or the (all) second reinforcing regions are preferably a recess or a recess of the bottom section or a defined or predetermined depression in the direction of the interior of the container body or viewed in the longitudinal direction Direction from the bottom section to the mouth. The outer wall of the bottom section formed by the second reinforcing region preferably extends (at least in sections) further into the container interior (or further in the longitudinal direction of the container from the bottom section in the direction the container mouth) as the (respectively) circumferentially adjacent portion of the bottom portion. At least one of the two edges, and more preferably the (each) second reinforcement region, is preferably delimited by a stepped transition section (towards a first reinforcement region).

The stand surface step preferably has a circular cross section and / or a hollow cylindrical or hollow cylinder-like region. Preferably, the stand surface step, a straight, preferably extending substantially in the longitudinal direction outer surface portion or extending in at least one direction, preferably in the longitudinal direction, (at least in sections) in a straight line. Preferably, a step-shaped transition between the standing surface and a region of the bottom section arranged in relation to the longitudinal direction closer to the container mouth (and located in a radial direction within the standing surface) is generated via the stand surface step. Particularly preferably, a predetermined step height of the stand surface step (preferably constant along the circumferential direction) is in a range between 0.1 mm and 4 mm and in particular in a range between 0.5 mm and 1.5 mm. Preferably, the rectilinear or substantially longitudinally extending section encloses an angle β with the plane in which the standing surface is arranged, which preferably consists of a region between 45 ° and 160 °, particularly preferably a region between 85 ° and 1 10 ° is selected. In other words, the footprint level is preferably described by a line which has a predetermined length and is preferably controlled via an angle β with respect to the plane in which the footprint is arranged and which is preferably perpendicular to the central axis or the longitudinal direction. Preferably, the floor space level is at least 0.1 mm and a maximum of 4 mm.

In a further advantageous embodiment, the step-shaped transition section extends, preferably substantially rectilinearly and / or substantially in a radial direction. A step-shaped transition section is preferably to be understood as having at least sections in the circumferential direction a substantially rectilinear section whose main extension direction is parallel to the longitudinal direction of the container. In other words, the stepped transition refers to a (stepped) change in the extent of the outer wall of the bottom portion in the longitudinal direction (at least partially in the circumferential direction). Under a Chen rectilinear course here is not only an exact straight course understood, but preferably also a curved course whose radius of curvature at least twice, preferably at least three times, preferably at least five times, preferably at least ten times as large as the radii of curvature of the (adjacent) corner areas. The recesses or the second reinforcement regions are preferably provided with a draft angle (by means of the step-shaped transition region). Preferably, the Entformungs- bevel extends from the center of the bottle to the footprint increasing, in other words, the recesses are preferably narrower at the top than below. In a further advantageous embodiment, a main extension plane of the step-shaped transition section or the draft angle includes a non-zero (pitch) angle with the longitudinal direction. Preferably, the substantially rectilinear portion or the Entformungsschräge does not extend exactly in the longitudinal direction, but includes with this (at least partially or in the circumferential direction seen) a predetermined angle of attack, which is preferably at least 0.1 °, preferably at least 0.5 °, preferably at least 2 °, particularly preferably at least 5 ° and / or preferably at most 90 °, preferably at most 80 °, preferably at most 70 ° and particularly preferably at most 60 °. Such a proposed inclination of the Entformungsschräge or the stepped transition portion has the advantage that their or its orientation substantially along or parallel to the longitudinal direction promotes the stability of the container bottom, but at the same time straight by means of the deviating from the longitudinal direction component of the substantially rectilinear section or the draft angle or the step-shaped transition section, the very good formability during the blowing process can advantageously be achieved. Furthermore, this proposed floor design is characterized by an internal pressure resistance against pressures of at least 0.2 and preferably at least 0.5 bar.

The footprint is in particular the area on which the bottom section and ultimately also the container stands. Under a circulating, not interrupted standing surface is to be understood in particular that the course of the footprint at least partially not interrupted in the circumferential direction, in other words is continuous. In particular, this base surface is not interrupted by (first and / or second) reinforcing regions of the bottom section. Preferably, the (first and / or second) reinforcing regions do not protrude into the standing surface. Preferably, the Standing surface at least in sections and preferably, the entire footprint has a substantially linear course, which is preferably to be understood that the floor space width or the width of the linienformigen course of the footprint preferably in a range between 0.1 mm and 10 mm, more preferably between 3 mm and 5 mm.

Preferably, the course of the standing surface essentially follows the cross-sectional contour or the cross section of the plastic container and / or preferably the ground plan geometry of the base. Preferably, the standing surface of the bottom section, in particular in the case of a circular plan of the bottom section and / or preferably in the case of a circular container cross-section, is annular, this standing surface having a predetermined stator diameter. This stator diameter is preferably greater than 2 cm, preferably greater than 3 cm, and particularly preferably greater than 4 cm and / or preferably less than 20 cm, preferably less than 10 cm, preferably less than 8 cm and preferably less than 7 cm. By means of the radial distance between the central axis of the container and the outer end of the base surface with respect to the center axis, a so-called edge ratio can be defined, in particular in the case of a circular layout. This stagger ratio is defined as the quotient of the dividend formed from the maximum diametrical distance (measured through the central axis) between two dividends (with respect to the central axis of the container) of the outer ends of the standing surface, the divisor being the main diameter of the container. The said diametric distance in this case is twice the radial distance described above. The main diameter is the diameter of the circular outline or of the circular cross-section of the container or the diameter of the (circular) side wall. The staged ratio is preferably greater than 0.3, preferably greater than 0.5, preferably greater than 0.6 and particularly preferably greater than or equal to 0.65. Furthermore, the stand ratio is preferably less than 0.95, preferably less than 0.9, preferably less than 0.85 and particularly preferably less than or equal to 0.81. However, the footprint can also be oval, in particular in the case of an oval floor plan of the bottom section and / or preferably in the case of an oval container cross-section, or follow an oval curve course. Furthermore, the floor space, in particular if the floor section in the ground plan or the container cross-section has a so-called "square-round" design, can follow this "square-round" progression apparently rectangular or square basic construction understood by means of large (curvature) RAdien on the sides and small (curvature) radii at the corners, which preferably allows a total of a tangentially continuous construction train. In this case, a "square-round" curve curve has at least two, preferably at least three and particularly preferably a multiplicity, correspondingly mutually different (curvature) radii of curved sections. Preferably, the standing surface of the bottom section has at least one section, preferably at least two and particularly preferably four sections with a substantially rectilinear course. A substantially rectilinear course is here understood to mean not only a precisely rectilinear course, but preferably also a curved course whose radius of curvature is at least twice, preferably at least three times, preferably at least five times, preferably at least ten times and particularly preferably at least 100 times as large as the radii of curvature the corner areas (the radii of the side walls can also be 100 times as large as the radii of curvature of the corners or corner areas, a (radius of curvature) around the example 1200 mm is quite realistic). Preferably (at least) one radius of curvature (and particularly preferably all radii of curvature) of a substantially rectilinear course (or a side area or a side wall) is greater than 100 mm, preferably greater than 500 mm and particularly preferably greater than 1000 mm. Preferably, in particular in the case of an oval or squared-round outline, a so-called stand area ratio is greater than 0.3, preferably greater than 0.5, preferably greater than 0.6 and particularly preferably greater than or equal to 0.65. Furthermore, the footprint ratio is preferably less than 0.95, preferably less than 0.9, preferably less than 0.85 and particularly preferably less than or equal to 0.81. Stand area ratio is understood to mean the quotient or a ratio of the floor diagonals and the main diagonal. The floor diagonal is understood to be the maximum diagonal of the floor space. The main diagonal is preferably understood as meaning the maximum or minimum diagonal of the floor plan or the basic construction of the floor section or the maximum or minimum diagonal of a container cross-section or the maximum outside diameter of the container. Preferably, the central region at least partially has a circular cross section and is at least partially dome-shaped or dome-shaped or dome-shaped or dome-shaped. In this way, the central region preferably projects in the direction of the container interior or in the direction of the container mouth with respect to the longitudinal direction seen from the bottom section. Preferably, an injection point (on the outer surface) is formed in the central area, which particularly preferably protrudes (starting from the floor center) towards the standing surface (seen from the container mouth in the longitudinal direction). The central region is preferably of dome-shaped or dome-shaped or dome-shaped or dome-like design, with the exception of the second reinforcing regions protruding into the central region. The central region preferably has a radius of curvature which is substantially constant over its entire area and which is selected from a range between 5 mm and 25 mm, preferably from a range between 8 mm and 12 mm. Preferably, the connection of the central region to the central axis takes place at a right angle (relative to the central axis).

Preferably, the curved first reinforcing region has a curvature such that it follows at least in sections and preferably completely a portion of a dome-shaped or dome-shaped or dome-shaped course. Preferably, all the first reinforcement regions follow a common section of a dome-shaped or dome-shaped or dome-shaped profile. Preferably, a dome-shaped or dome-shaped course of the first reinforcement regions is interrupted in regions only by the second reinforcement regions (as well as the step-shaped transitional sections). This formation following the first reinforcement regions at least in sections of a dome-shaped or dome-shaped or dome-shaped structure serves, in particular, also to absorb pressures or to counteract these and / or to forward them in a targeted manner. Preferably, the central region has a smaller radius of curvature in its complete region or in its dome-shaped or dome-shaped region than the second dome-shaped or dome-shaped or dome-shaped structure formed by the first reinforcing regions (at least in certain regions). It is possible that the radii of curvature (in the respective areas) are constant, but it would also be conceivable that the radii of curvature change in a radial course of the wall. In this case, the radius of curvature of the (preferably each) first (curved) reinforcement region is preferably at least equivalent to the inner stator radius in the case of a circular outline and is preferably at most 500 mm. In the case of an oval or square-round ground contour, the radius of curvature of the (preferably each) first (curved) reinforcing area is at least equivalent to the smaller contour radius (of the standing area) and is preferably at most 500 mm. Preferably, a ratio between the radius of curvature in the first dome-shaped structure of the central region and the radius of curvature in the first gain regions is between 0.02 and 0.5. Preferably, the first reinforcement regions are each tangentially or tangentially connected to the central region. The transition radius of curvature, which allows a tangential connection of a first reinforcement region to the central region, is preferably selected from a range between 0.1 and 12 mm and particularly preferably from a range between 1.0 mm and 6.0 mm. The curvature of this transition region between the first reinforcing region and the central region is preferably oriented opposite to the curvature of the central region and / or the first reinforcing region.

In this case, the radii of curvature may preferably relate to a surface course or its radii of curvature of the respective regions of the bottom section in a longitudinal section of the container, ie a section along the longitudinal direction, preferably along the central axis.

In an advantageous embodiment, the second gain region, preferably all second gain regions, are curved at least in sections, and a radius of curvature of the first gain region preferably differs at least in sections from a radius of curvature of the second gain region. In this case, the second reinforcing regions can likewise each follow a dome-shaped or domed or dome-shaped or dome-shaped (surface) profile. This offers the advantage that a very good internal pressure resistance or pressure transmission of these areas can be achieved by such a configuration. It is also conceivable, however, for the (or each) second amplification region to be planar or planar.

In a further advantageous embodiment, each second reinforcing region is connected in both circumferential directions via at least one step-shaped transition section to a first reinforcing region, and these two step-shaped transitional sections preferably follow one another in a leg-like manner (in a radially inward direction). In this case, these two step-shaped transition sections can be at least partially aligned with respect to their vertex with respect to one another. include an angle which is preferably greater than 15 °, preferably greater than 25 ° and more preferably greater than 30 ° and / or preferably less than 180 °, preferably less than 90 °, preferably less than 60 ° and more preferably less than 50 °. In a further advantageous embodiment, the bottom section has a central region which is radially inward with respect to the curved first reinforcing region and extends at least in sections, which is concavely curved as viewed from the container mouth. Preferably, an axis of rotation of the container and / or a central axis of the container runs centrally through this central region.

In a further advantageous embodiment, the central region and the at least one curved first reinforcement region merge into one another over a region of opposite curvature and / or are connected to one another, preferably tangentially.

In a further advantageous embodiment, the at least one curved first reinforcement region and / or the at least second reinforcement region is concavely curved as seen from the container mouth. Preferably, all the first reinforcement regions and / or all second reinforcement regions are concavely curved as seen from the container mouth or the container interior. However, the second reinforcement regions preferably have a smaller radius of curvature, that is to say they are more curved.

In a further advantageous embodiment, the bottom section has at least two, preferably at least three, particularly preferably at least four and in particular exactly four or five first reinforcement regions. Furthermore, the bottom section has at least two, preferably at least three, particularly preferably at least four and in particular exactly four or five second reinforcement regions. In this case, the first and the second reinforcement regions are preferably arranged alternately to one another in the circumferential direction of the bottom section.

In a further advantageous embodiment, the bottom section has at most ten, preferably at most seven and particularly preferably at most five first reinforcement regions and / or second reinforcement regions. In a further advantageous embodiment, the second reinforcing regions are arranged at least in sections with respect to the longitudinal direction closer to the mouth than the first reinforcing regions. Preferably, the second reinforcing regions are disposed closer to the mouth with respect to the longitudinal direction as compared to circumferentially adjacent regions of the first reinforcing regions. Thus, the second reinforcement regions are preferably recesses or recesses in the bottom section.

In a further advantageous embodiment, the second reinforcement regions essentially form a (triangular or pie-shaped or triangular-like) surface. The side boundaries may at least partially follow an arcuate or circular arc-like or else a straight course. The corners of the first reinforcement regions preferably form a trapezoid. The side boundaries connecting these corners can follow a curved or a circular arc-shaped curve.

In a further advantageous embodiment, a circumferential region with constant curvature is arranged and / or formed between the base surface and the (side) wall section of the container, which is in particular smooth and particularly preferably has no ribs and / or tensile strip geometries.

The present invention is further directed to a bottom portion of a (plastic) container, which has a circumferential, not interrupted standing surface, wherein the bottom portion is preferably formed in one piece.

According to the invention, the bottom section has at least one adjoining the standing surface at least in sections, with respect to this radially inner, in particular fully trained stand surface step, wherein the stand surface step at least one circumferentially extending, curved first gain region connects and at the curved first gain region at least partially in the circumferential direction, at least one second reinforcing region extending in the circumferential direction adjoins, wherein the first reinforcing region and the second reinforcing region merge into one another at least in sections via a step-shaped transition section. In this case, the bottom section all above in connection Having features described with the container individually or in combination with several.

The present invention is further directed to a blow mold for producing a plastic container. According to the invention, this blow mold has a bottom part which is suitable and intended for producing a bottom section for a plastic container (proposed according to the invention) as described above. In particular, the blow mold has a bottom part, which is formed at least in sections corresponding to a negative mold to the bottom section described above. In this case, the bottom part of the blow mold, as a negative mold to the bottom section described above, can have all correspondingly adapted features described above in connection with the container, individually or in combination with a plurality. In this case, the bottom portion of the container to be manufactured may have all the features described above in connection with the container individually or in combination with a plurality.

The present invention is further directed to a method for producing a plastic container of the type described above, wherein first plastic preforms are provided, furthermore the plastic preforms heated and finally within a blow mold, preferably with a flowable medium such as liquid and / or gaseous medium, to be expanded.

According to the invention a bottom part of this blow mold is designed such that it generates a bottom portion of a plastic container of the type described above. In this case, the bottom part of the blow mold can have, as a negative mold to the base section described above, all individually adapted features described above in connection with the container, individually or in combination with several.

It is therefore also proposed in the context of the method according to the invention that a Entformungsschräge one and preferably all stepped transition sections as described above is chosen so flat or are that a good and time-saving formability can be achieved by expansion with flowable medium.

Further advantages and embodiments will be apparent from the attached drawings: a rough schematic representation of the construction of a container; an oblique view of a bottom portion and a plan view of a bottom portion of a container according to the invention in a first embodiment; a detail of a side view of a container according to the invention in the first embodiment; a representation of an outer contour of a basic construction of a container according to the invention in the first embodiment; a representation of an outer contour of a container according to the invention in a first embodiment; two representations of a bottom portion according to the invention in two different embodiments; a section through the basic construction of a container according to the invention without second gain region; an illustration of a bottom portion according to the invention in the first embodiment; a section through the basic construction of a container according to the invention with a second reinforcement region; 10 shows two representations of a floor section according to the invention with two different embodiments of the second reinforcement areas; Fig. 11 is an illustration of the construction of a second reinforcement region; and

Fig. 12 is an oblique view of the bottom portion of an inventive

Container in a second embodiment.

1 shows a roughly schematic representation of the structure of a (plastic) container 1 extending in the longitudinal direction L. It has an opening 60 with a feed opening for a drink, a circumferential (side) wall section 50 and a bottom section adjoining thereto 40 on. The longitudinal direction L coincides here with the central axis of the container 1 and also with the axis of rotation of the container. The reference character U denotes a circumferential direction, which is given by a direction of rotation about the longitudinal direction L or about the central axis L of the container 1. 2a shows an oblique view of a bottom section 40 and FIG. 2b shows a top view of the bottom section 40 of a container 1 according to the invention in a first embodiment. Following the side wall of the bottom section 40, FIG. 2 a shows a part of the (side) wall section 50, which has shaped ribs 52. It can be seen in particular in Fig. 2a that according to the proposed invention in the side wall of the bottom portion 40 here no ribs or Zugbandgeometrien formed or are present, since the design of the bottom portion 40, at least for reasons of stability does not require such attachment.

The reference numeral 10 denotes that surface of the bottom portion 40 on which the bottom and thus also the container 1 is, the so-called footprint. This shows an uninterrupted course, typically follows essentially the ground plan geometry of the bottom or the cross section of the container 1 and is formed here annular. A step-shaped transition to the closer to the central axis L of the container 1 (or in a radial direction relative to the.) Via the stand surface level 1 1, which preferably directly adjoins the base surface 10 and which also has a circular cross section This stepped transition is thereby generated in the longitudinal direction L in the direction of the bottom portion 40 to the mouth 60, so that the standing surface 10 seen in the longitudinal direction L is located farthest from the mouth 60. The radial further inward areas of the bottom portion 40 protrude or extend further into the container interior, so that as a whole seen in the longitudinal direction of the mouth 60 and the container interior, the footprint 10 defines a concave portion of the bottom portion 40.

Shown in FIGS. 2a and 2b is further that (indirectly) to the base surface 10 and (immediately) adjoining the stand level 1 1, first reinforcing regions 30 and in turn, radially further inwardly, a central region 34 with a bottom center 12th followed. In the base center 12, an injection point is typically formed (centrally or centrally). Dom 34 preferably projects into the interior of the container (see also FIGS. 4 and 5), but the injection point itself preferably lies outside and preferably projects in the direction of the base. The first reinforcing regions 30 pass over into the central region 34 via a transition section 32 of opposite curvature. The central region 34 is a (in longitudinal direction L of the mouth 60 and the container interior of seen from) from concavely curved area and, as shown here, dome-shaped or dome-like curved and forms a so-called first (smaller) dome.

The first reinforcing regions 30 are here, taken separately in each case, likewise (in the longitudinal direction L as viewed from the mouth 60 or the container interior) also concavely curved regions. They are seen individually and together a section of another dome-like curved or as shown here dome-shaped area, the so-called second (larger) cathedral. The first reinforcing regions 30 here form the (still rotationally symmetrical) basic construction of the bottom section 40 (still without second reinforcing regions 20). A dome-shaped or at least partially dome-shaped or dome-shaped configuration (as a larger dome) of the area between the standing surface 10 or the floor space 1 1 and the central area 34 as the first dome has the advantage that on the floor center 12 (or on one formed injection point) or the central region 34 acting forces can be derived well to the base 10 back. In the embodiment shown here, this basic construction is interrupted (in the circumferential direction) by five, substantially triangular-shaped, curved second reinforcing regions 20. These are depressions or recesses in the direction of the bottle body or in the longitudinal direction L as seen from FIG Bottom portion 40 in the direction of the mouth 60. These are limited to their sides in the circumferential direction U out by a respective stepped transition portion 24, 22 to the adjacent first reinforcing regions 30. These stepped transition sections 24, 22 contribute by their main extension direction in the radial direction substantially to the stability of the container bottom. Here, the two transition sections 24 and 22 preferably, as shown here, not exactly in the radial direction, but meet (leg-like) already in a vertex 28, not on the central axis L of the container 1, but preferably further radially outward on the Outside wall of the bottom portion 40 is located. The reference symbol Q denotes a (diametrical) cross-section line with sections a and b through the bottom section 40, the course of which is effected in particular by a first reinforcement region 30 (see section b) and by a second reinforcement region 20 (see section a). Reference will now be made to FIGS. 4 and 5. FIG. 3 shows a detail of a side view of a bottom section 40 and of a side view

Wall section 50 of a container 1 according to the invention in the first embodiment. It can be seen again that there are no ribs 52 on the side wall of the bottom section 40, but ribs 52 only begin on the wall section 50 of the container 1.

4 shows a cross-sectional representation of an outer contour of a basic construction of a container 1 according to the invention in the first embodiment, in which only a first reinforcement region 30 and no second reinforcement region 20 are provided in the bottom section 40. As can be seen, this cross-sectional view is configured axially symmetrical with respect to the longitudinal axis L or central axis L and the bottom section 40 is rotationally symmetrical with respect to these axes. The bottom portion 40 has a circular ring-shaped base area 10, to which a standing surface stage 1 1 extending in the longitudinal direction L adjoins. In turn, a dome-shaped curved first reinforcement region 30, the so-called large dome, and thereafter (via a transitional section of opposite curvature) the so-called small dome, which is formed by the central region 34, are closed. The central region 34 has, centrally, that is lying on the central axis L, the bottom center 12 (and possibly an injection point formed thereon). The reference numeral 14 denotes a portion of the floor center 12. The reference character RA indicates an outer radius of the container 1 and RD a maximum extent of the Central region 34 in the radial direction. RD is preferably less than 2 cm, preferably less than 1.5 cm and particularly preferably less than 1 cm.

5 shows a cross-sectional representation of an outer contour of a container 1 according to the invention in a first embodiment along the cross-sectional line Q from FIG. 2b. In comparison with FIG. 4, it can be seen that now the axis symmetry in the cross-sectional representation and the rotational symmetry of the bottom section 40 are broken by the provision of the second reinforcement regions 20. It can also be clearly seen that the second reinforcing regions 20 are recesses or defined depressions of the bottom section 40 (see section a), which extend in the direction of the interior of the container or closer to the mouth as viewed in the longitudinal direction 60 are arranged as the corresponding in the circumferential direction U adjacent areas of the bottom portion 40 (ie, the corresponding circumferentially U adjacent areas of the first gain regions 30, see section b). It can further be seen from FIG. 5 that preferably the second reinforcement regions 20 are more curved than the first reinforcement regions 30 or correspondingly have a smaller radius of curvature.

In addition, the respectively selected, tangent-continuous transition between the second reinforcement region 20 and the central region 34 in the connection point 38 (in this case identical to vertex 28) is advantageous for the good formability of the bottom section 40. Also between the first reinforcing regions 30 and the central region 34 is advantageously selected (in the connection points 36) a tangentenstetige connection. FIG. 6 shows two illustrations of a bottom section 40 according to the invention in two different embodiments. The two embodiments shown here have different floor plans. While the embodiment shown to the left of both has a circular floor plan, the embodiment of the container 1 or its bottom section 40 shown to the right of both has a so-called square-round floor plan. Advantageously, the footprint 10 follows this course of the floor plan. The term "square-round" defines here the seemingly rectangular or square basic construction by means of large radii RG on the sides and small radii RK at the corners, which allow a tangentially continuous (tangential) design train as a whole. In the case of a circular plan execution is called a Stroke ratio, which is defined as the ratio between the circle radius R and the outer radius RA. In the case of a square-round floor plan (or else an oval floor plan), a stand area ratio is given by the ratio between the maximum diagonal SD of the standing area 10 and the main diagonal HD of the container 1 or of the floor section 40. or footprint ratio at least 0.3 and at most 0.95, more preferably between 0.65 and 0.81.

7 shows a section through the basic construction of a container 1 according to the invention, which is a container 1 with a bottom section 40 with a so-called double dome and with a step. The double dome is, as already shown in FIG. 4, given by the central region 34 designed as a so-called small dome, which has the radius of curvature R1, and the curved, first amplification area 30 with the radius of curvature R3 designed as a larger dome. In the case of a circular outline, this radius of curvature R3 of the larger dome or of the first reinforcement area 30 is at least equivalent to the inner circle radius R, but is chosen to a maximum of 500 mm. In the case of an oval or square-round plan, this radius of curvature R3 is at least equivalent to the smaller contour radius, but is chosen to a maximum of 500 mm. The extension (dashed continued line) of the first reinforcing region 30 is perpendicular to the central axis L. Via the transition section 32, which has a curvature opposite to the central region 34 and the first reinforcing region 30 (radius of curvature R2), the central region 34 or the small dome connected tangentially (or tangentially) to the first reinforcement region 30 or to the larger dome. The transition radius of curvature R2, which here grants a tangential connection between the radii of curvature R1 and R3, is at least 0.1 mm to a maximum of 12.0 mm and preferably at least 1.0 mm and a maximum of 6.0 mm. The radius of curvature R1 of the smaller dome is at least 5 mm and a maximum of 25 mm, ideally between 8 and 12 mm. Preferably, as shown here, the connection to the central axis L at right angles.

Also shown is the circular ring-shaped base surface 10, as well as the floor space level 1 1, which extends in the longitudinal direction L. The footprint stage 1 1 in this case has a rectilinear section here, which extends exactly here in the longitudinal direction L. This straight section 1 1 has the step height h, which is at least 0.1 mm and at most 4 mm, preferably has a value between 0.5 mm and 1, 5 mm. The orientation or an oblique position of the stand surface level 1 1 can preferably be given by the fact that this extends in the longitudinal direction L (substantially rectilinear) section with the plane E includes a predetermined angle ß, the at least 45 ° and a maximum of 160 ° may, but preferably between 85 ° and 1 10 °. The plane E ("vertical base line") is preferably a plane in which the standing surface 10 is arranged, and which is preferably perpendicular to the central axis or the longitudinal direction L. The width bS of the base surface, ie its extent in the radial direction, is preferably between 0.1 mm and 10 mm and more preferably between 3 mm and 5 mm. The outer end of the base 10 relative to the central axis L preferably defines the so-called static or surface area ratio.

Reference symbol R4 denotes a radius for the tangential connection to the angle control by the angle of attack a. This curvature R4 grants a tangential connection of the first reinforcement region 30 with radius of curvature R3 to the attachment line L4 controlled by the angle .alpha. The radius of curvature R4 can be selected between 0.1 mm and 50 mm, but preferably between 0.5 mm and 4 mm. It is also shown that, via the angle of attack α, a control of the larger dome relative to its peakedness following R4 and, ultimately, to the footprint stage 11 can take place. This angle of attack α can be between a minimum of 45 ° and a maximum of 160 °, preferably between 95 ° and 125 °.

FIG. 8 is an illustration of the bottom portion 40 in the first embodiment. In this illustration, the reference symbol LA denotes a boundary line of a second reinforcement region 20 or recess, which is preferably a defined depression in the direction of the interior of the bottle body. It can be seen that the shape of the second reinforcing region 20 may preferably be piecemeal or triangular with arcuate sidewall-line guidance. The recesses or the second reinforcing regions 20 can, as can be seen in the section through the basic construction shown in FIG. 9, be the sheet which is likewise designated by the reference numeral 20 and which is stretched over the curvatures R1 to maximally R4. Either the curvature R3 or R4 becomes one point penetrated. The connection of the arc 20 and the second gain region 20 takes place in the first point on the curvature R1 and in the second point on the Anstelllinie the angle a. By penetrating the curvatures R3 or R4, different embodiments result in the outer boundary of the recesses 20 and the second reinforcing regions 20, as shown in FIG. In this case, in the embodiment shown on the left, the second reinforcement regions 20 or the recesses 20 lead almost to the edge or up to the stand surface stage 11 or the standing surface 10, whereas in the embodiment shown on the right an annular surface remains. In the latter embodiment, the second amplification regions 20, viewed in the radial direction, do not adjoin the standing surface stage 11, but preferably also in this direction to a first amplification region 30. FIG. 11 illustrates the construction of a second amplification region 20 Fig. 9 marked with reference numeral 20 arc circularly rotated about the central axis L and expanded over a defined angle, the so-called twist angle 21, symmetrically to a body. The following formula can preferably apply to the angle of rotation: 360 ° divided by the (double) number of second amplification areas 20. Conceivable for the angle of rotation are degrees between 1 ° and 180 °.

Fig. 12 shows an oblique view of the bottom portion 40 of a container 1 according to the invention in a second embodiment. It is shown that the recesses 20 and the second reinforcing regions 20 are provided with a draft angle. The Entformungsschräge thereby extends from the center of the bottle or the center axis L to the base 10 towards increasing, in other words, the recesses 20 and the second reinforcing regions 20 above narrower than below. This Entformungsschräge can be based on an imaginary vertical at least 0.1 ^A and a maximum of 90 °, but ideally it is between 5 ° and 60 °.

Preferably, the recesses or the second reinforcement regions 20 are connected tangentially to one another by a defined / predefined radius with the double dome construction or with the first reinforcement regions 30 and / or the central region 34. In this case, the radius of curvature may preferably be at least 0.1 mm and / or a maximum of 20 mm, particularly preferably between 0.2 mm and 7 mm.

The Applicant reserves the right to claim all features disclosed in the application documents as essential to the invention, provided they are novel individually or in combination with respect to the prior art. It is further pointed out that features have also been described in the individual figures, which in themselves can be advantageous. The person skilled in the art immediately recognizes that a specific feature described in a figure can also be advantageous without taking over further features from this figure. Furthermore, the person skilled in the art 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

10 floor space

1 1 stand level

12 floor center

20 second gain range

21 twist angle

22 transition section

28 vertex

30 first gain area

32 transition section

34 central area

36, 38 connection point

40 floor section

50 wall section

52 ribs

60 estuary

a, b sections of the cross section line

bS steps wide

E level h step height

HD main diagonal

L longitudinal direction, central axis

L4 adjustment line

LA boundary line

U circumferential direction

Q cross section line

RA outer radius

RD radial extent of the central region 34

R, R1, R2 radii of curvature

RG, RK radii of curvature

SD floor diagonal

Claims

claims

Plastic container (1) for holding drinks, having an orifice (60), a in a longitudinal direction (L) of the plastic container (1) to this mouth (60) adjoining wall portion (50) and a bottom portion (40) having a circumferential , not interrupted base surface (10), wherein the plastic container (1) is preferably formed in one piece,

characterized in that

the base section (40) has at least one stand surface step (1 1) which adjoins the standing surface (10) at least in sections, relative to this radially inner, in particular fully formed, wherein at least one of the stand surface steps (1 1) extends in the circumferential direction (U) extending, curved first reinforcing region (30) and adjoining the curved first reinforcing region (30) at least partially in the circumferential direction (U) at least one in the circumferential direction (U) extending second reinforcing region (20), wherein the first reinforcing region (30) and the second reinforcing region (20) merge into each other at least in sections via a step-shaped transition section (24, 22).

Plastic container (1) according to claim 1,

characterized in that

the second reinforcement region (20) is curved at least in sections and a radius of curvature of the first reinforcement region (30) differs, at least in sections, from a radius of curvature of the second reinforcement region (20).

Plastic container (1) according to at least one of the preceding claims, characterized in that

the step-shaped transition section (24, 22) preferably extends substantially rectilinearly and / or substantially in the radial direction.

4. plastic container (1) according to at least one of the preceding claims, characterized in that

a main extension plane of the stepped transition portion (24, 22) includes a non-zero angle with the longitudinal direction (L).

5. plastic container (1) according to at least one of the preceding claims, characterized in that

each second reinforcing region (20) is connected in both circumferential directions (U) via at least one step-shaped transition section (24, 22) to a first reinforcing region (30) and these two stepped transition sections (24, 22) converge toward one another.

6. plastic container (1) according to at least one of the preceding claims, characterized in that

the bottom section (40) has a central region (34), which lies radially inwardly with respect to the curved first reinforcement region (30) and which curves at least in sections, which is concavely curved as viewed from the container mouth (60).

7. plastic container (1) according to the preceding claim,

characterized in that

the central region (34) and the at least one curved first reinforcement region (30) merge into one another and / or are connected to one another via a reinforcement region (32) of opposite curvature.

8. plastic container (1) according to at least one of the preceding claims, characterized in that

the at least one curved first reinforcement region (30) and / or the at least second reinforcement region (20) is concavely curved as seen from the container mouth (60).

9. plastic container (1) according to at least one of the preceding claims, characterized in that

the bottom section (40) at least two, preferably at least three and especially preferably has at least four first reinforcement regions (30) and / or second reinforcement regions (20).

10. plastic container (1) according to at least one of the preceding claims, characterized in that

the bottom section (40) has at most ten, preferably at most seven and particularly preferably at most five first reinforcement regions (30) and / or second reinforcement regions (20).

1 1. Plastic container (1) according to at least one of the preceding claims, characterized in that

the second reinforcing regions (20) are arranged at least in sections with respect to the longitudinal direction (L) closer to the mouth (60) than the first reinforcing regions (30).

12. Plastic container (1) according to at least one of the preceding claims, characterized in that

the second reinforcing regions (20) form substantially a triangular surface.

13. plastic container (1) according to at least one of the preceding claims, characterized in that

between the base surface (10) and the wall portion (50) a circumferential reinforcing region (40) is arranged and / or formed with a constant curvature.

14. blow mold for producing a plastic container (1) according to at least one of the preceding claims,

characterized in that

this blow mold has a base part which is suitable and intended for producing a bottom section (40) for a plastic container (10) according to at least one of the preceding claims.

15. A method for producing a plastic container (1) according to at least one of the preceding claims 1-13, wherein first plastic preforms for Furthermore, the plastic preforms are heated and finally expanded within a blow mold,

characterized in that

a bottom part of this blow mold is designed such that it generates a bottom portion of a plastic container according to at least one of the preceding claims 1-13.