Plastic container with a garter geometry in the bottom region

Abstract

A plastic container (1) has a base region (2), a base body (50) which is connected to the base region (2) in a longitudinal direction (L) of the plastic container (1), and an opening region (6) which is connected to the base body (50) at least indirectly in the longitudinal direction (L), the opening region having a container mouth (8), wherein the base region (2) has at least three upstanding feet (22), wherein at least one groove (30) is provided between two, in particular adjacent, upstanding feet (22), the groove having a groove bottom (32) which extends over an angle of circumference in a circumferential direction (U), wherein the groove bottom (33) is a tie, wherein the container is of one piece. According to the invention, the groove bottom (33) has a central tie region (44), the wall of the container being bent inwards in the central tie region, the central tie region being arranged between two lateral tie regions (32, 36) in the circumferential direction (U), wherein, in a cross section perpendicular to the longitudinal direction (L), the groove bottom (33) is formed according to a first curvature characteristic in the central tie region and according to a second curvature characteristic which is different from the first curvature characteristic in the two lateral tie regions (32, 36).

Description

[0001] This invention relates to a plastic container, preferably a PET plastic container and / or a plastic bottle. More specifically, this invention relates to a plastic container for beverages. Furthermore, the invention also relates to a bottom structure for such plastic containers. In the prior art, plastic containers are typically manufactured by blow molding, particularly stretch blow molding. For this purpose, a heated plastic preform expands within a blow mold to form a plastic container or bottle.

[0002] In the prior art, the so-called petal-shaped bottle bottom is known. Containers with petal-shaped bottle bottoms include multiple upright legs, typically five. For example, the bottom of the container bears the weight of the full bottle and is therefore subjected to a relatively high load. It is known from the prior art that there are grooves between these upright legs.

[0003] For the design of PET petal-shaped bottle bottoms (freeform bottle bottoms) in hot regions, the prior art uses so-called ties. For this purpose, it is known in the prior art to use rotating surfaces as ties between (upright) feet where more material is gathered, so as to fix the bottom center even under the influence of internal pressure and temperature, similar to a "seat belt".

[0004] In particular, the straps located at the bottom of the container, especially those between the upright legs, serve to guide the force acting on the center of the bottom (e.g., the injection point of the plastic container) to the sidewalls of the plastic container.

[0005] The wide straps made it difficult to fully shape the bottom and stretch the material to the toe. As a result, dents and white cracks appeared at the toe.

[0006] In addition, the following situation may occur: the PET material partially contacts the mold prematurely, and after cooling, it may move further due to stretching. This results in visible defects ("striking marks"), which may weaken the tie area.

[0007] According to EP2036820 A1, a petal-shaped freeform base with ties is known, which has a constant radius of curvature.

[0008] A plastic container with a petal-shaped bottom is known from DE 10 2013 110 139 A1, wherein a tie forms a groove bottom between every two adjacent upright legs, the tie curving outward and having a constant curvature when viewed in the circumferential direction. Therefore, the bottom wall of the container, particularly in the region of the groove bottom and particularly in the region of the geometric nut at the groove bottom, curves outward, corresponding to a spherical region. It is further described that the tie surface is generated by rotation about a rotational axis.

[0009] A tether cross-sectional profile is known from DE 10 2019 119 984 A1, which substantially follows an nth-order spline.

[0010] The purpose of this invention is to overcome the known disadvantages in the prior art and to provide a plastic container and a blow molding apparatus for manufacturing the plastic container, which ensures the closest possible distribution of plastic material during the manufacturing process of the plastic container (e.g., in stretch blow molding, in which a plastic preform is pressed onto a blow mold having a bottom shape by the pressure of a fluid medium), while achieving high stability of the bottom with the lowest possible material consumption, thereby being able to withstand its own weight and possible internal pressure (e.g., in the case of carbonated beverages).

[0011] According to the invention, this objective is achieved by the subject matter of the independent claims. Advantageous embodiments and further improvements of the invention are the subject matter of the dependent claims.

[0012] The plastic container according to the invention, particularly a plastic container for beverages, has a bottom region, a base connected to the bottom region in the longitudinal direction of the plastic container, and a container opening connected at least indirectly to the base in the longitudinal direction.

[0013] The bottom region has at least three upright legs, preferably at least five upright legs, and particularly preferably exactly five upright legs. At least one groove is provided between two, particularly adjacent, upright legs, the groove having a bottom extending at a (given) circumferential angle in the circumferential direction. The bottom of the groove serves as a strap. In particular, the design of the bottom at the (given) circumferential angle (especially by its shape) makes it suitable for serving as a strap. Furthermore, the container is preferably integrally formed.

[0014] According to the invention, each (particularly each) trough bottom (or tie) has a central tie region (and particularly two lateral tie regions) in which the container wall is curved inward and this region is located between the two lateral tie regions in the circumferential direction.

[0015] Preferably, the orientation of the groove bottom in the lateral lacing region is mirror-symmetric to the orientation of the groove bottom in the second lateral lacing region (in particular, the plane of symmetry extends through the geometric center of the groove bottom in the central lacing region). Preferably, the orientation of the groove bottom in the central lacing region is mirror-symmetric with respect to the plane of symmetry, which extends substantially through the geometric center of the groove bottom (in the central lacing region).

[0016] Preferably, the groove bottom (i.e., particularly and preferably substantially in any cross-sectional plane perpendicular to the longitudinal direction (through the groove bottom)) is formed in the central lacing region according to (at least) a first curvature feature, and is formed in the two lateral lacing regions according to (at least) a second curvature feature different from the first curvature feature. Preferably, the groove bottom on the cross-section perpendicular to the longitudinal direction (preferably substantially each) is formed in the lateral lacing regions according to the same second curvature feature.

[0017] In particular, "the bottom of the groove on the cross section perpendicular to the longitudinal direction" should be understood as the outline of the groove bottom within the cross section extending perpendicular to the longitudinal direction.

[0018] Preferably, the groove bottom in the central lacing region, on the cross section perpendicular to the longitudinal direction (preferably substantially each), follows a profile that is constructed and / or can be constructed according to a first curvature characteristic.

[0019] Preferably, the groove bottom in either of the two lateral lacing regions, on a cross section perpendicular to the longitudinal direction (preferably substantially each), follows a profile that is constructed and / or can be constructed according to a second curvature characteristic.

[0020] In other words, there is a central frenulum region on one side and two lateral frenulum regions on the other, constructed in different ways. In particular, the lateral frenulum regions are therefore not (structural and / or geometric) continuations or extensions of the central frenulum region, but the lateral frenulum regions (especially one, preferably each cross section perpendicular to the longitudinal direction) follow a profile (line) constructed by different construction parameters (compared to the construction parameters of the central frenulum region).

[0021] In particular, it is recommended that the lacing or groove bottom (viewed from the circumferential direction) have at least (preferably exactly) three regions compared with the prior art (a first lateral lacing region, a central lacing region, and a second lateral lacing region), wherein two adjacent lacing regions can be distinguished from each other in terms of their (geometric) structure and / or curvature characteristics.

[0022] In other words, the orientation of the groove bottom (in the cross section perpendicular to the longitudinal direction) in the central lacing region at least partially, preferably the entire orientation of the groove bottom in the central lacing region, reflects the first curvature characteristic.

[0023] In other words, the orientation of the groove bottom in (preferably each) lateral tether region (in a cross-section perpendicular to the longitudinal direction) at least partially, preferably throughout the entire orientation of the groove bottom in the lateral tether region, reflects the second curvature characteristic.

[0024] The curvature characteristic can be a curvature amount, such as a range within which the amount of curvature moves along the profile of the groove bottom (in a cross section perpendicular to the longitudinal direction) of each (intermediate or lateral) tether region.

[0025] The orientation of the groove bottom in the central tether region may be the same as or opposite to the orientation of the groove bottom in the lateral tether regions or both lateral tether regions (in a cross-section perpendicular to the longitudinal direction). It is also conceivable that the groove bottom in the lateral tether regions (at least partially or entirely in a cross-section perpendicular to the longitudinal direction) is not curved, and / or the amount of groove bottom curvature in the lateral tether regions is zero (at least partially or entirely).

[0026] For example, the amount of curvature of the groove bottom (in a given cross-sectional plane perpendicular to the longitudinal direction) in each of the central lacing regions can be selected from a first (given) range, while the amount of curvature of the groove bottom (in a given cross-section perpendicular to the longitudinal direction) in the two lateral lacing regions can be selected from a second (given) range, which differs from the first range. Preferably, the second region and the first region do not overlap (substantially). Preferably, the overlap area of ​​equal curvature between the first region and the second region accounts for less than 20%, preferably less than 10%, and particularly preferably less than 5% of the first region and / or the second region.

[0027] Additionally or alternatively (and / or in a preferred embodiment), the bottom of the groove in the cross-section perpendicular to the longitudinal direction (i.e., particularly within the cross-section extending perpendicular to the longitudinal direction) preferably has a greater curvature in the central lacing region than in the groove bottoms in the two lateral lacing regions. The direction of curvature of the groove bottom in the lateral lacing regions, preferably in the two lateral lacing regions, may be the same as the direction of curvature or arcuate curvature of the groove bottom in the central lacing region. Alternatively, the direction of curvature of the groove bottom in the lateral lacing regions, preferably in the two lateral lacing regions, may be opposite to the direction of curvature or arcuate curvature of the groove bottom in the central lacing region. It is also contemplated that the groove bottom in the lateral lacing regions, and preferably in the lateral lacing regions, is flat or horizontal and / or straight or without curvature in cross-section.

[0028] Additionally or alternatively, the curvature of the groove bottom in the central lacing region is preferably at least partially greater than the curvature of the groove bottom in the two lateral lacing regions (particularly regardless of the direction of any curvature in each lacing region). (Also) preferably, the direction of curvature of the groove bottom in the central lacing region may be the same as or opposite to the direction of curvature of the groove bottom in the lateral lacing regions. It is also conceivable that the groove bottom in the lateral lacing regions (at least partially or entirely) has no curvature.

[0029] Preferably, the curvature of the two lateral lacing regions is significantly different from that of the central lacing region. Preferably, the curvature of the bottom of the trough in the two lateral lacing regions is significantly different from that of the bottom of the trough in the central lacing region.

[0030] In a preferred embodiment, the ratio (particularly each and / or preferably each) of the curvature of the groove bottom in the central tether region to the curvature of the groove bottom in the lateral tether regions (within each given cross-sectional plane perpendicular to the longitudinal direction, and preferably substantially within that plane) is greater than 2, preferably greater than 2.5, preferably greater than 3, preferably greater than 5, preferably greater than 10, preferably greater than 15, preferably greater than 20, preferably greater than 25, and particularly preferably greater than 30. The term "substantially" here specifically means that this applies to all points of the groove bottom (within a given cross-section perpendicular to the longitudinal direction), except for the transition regions between the central tether regions and the lateral tether regions. In this case, the transition region preferably does not exceed 50%, preferably not more than 40%, preferably not more than 30%, preferably not more than 20%, and particularly preferably not more than 10% of the profile length or arc length of the groove bottom in the central tether region and / or each lateral tether region and the circumferential angle (extending from each central or lateral tether region).

[0031] Preferably (within a given cross section perpendicular to the longitudinal direction), the ratio of the curvature of the bottom of the groove at at least one point in the central tether region to the curvature of the bottom of the groove at at least one point in the lateral tether region and the curvature of any point in the second (preferably continuous) cross section within the lateral tether region is greater than 2, preferably greater than 2.5, preferably greater than 3, preferably greater than 5, preferably greater than 10, preferably greater than 15, preferably greater than 20, preferably greater than 25, and particularly preferably greater than 30.

[0032] Preferably, the first portion extends in a given cross section perpendicular to the longitudinal direction, within the central tether region, for at least 10%, preferably at least 20%, preferably at least 25%, preferably at least 30%, preferably at least 45%, preferably at least 50%, preferably at least 70%, preferably at least 75%, preferably at least 80%, preferably at least 95%, and particularly preferably at least 98% of the length of the groove bottom.

[0033] Preferably, the second portion extends into a given cross-section perpendicular to the longitudinal direction, laterally into one of the tether regions (preferably each) for at least 10%, preferably at least 20%, preferably at least 25%, preferably at least 30%, preferably at least 45%, preferably at least 50%, preferably at least 70%, preferably at least 75%, preferably at least 80%, preferably at least 95%, particularly preferably at least 98% of the length of the groove bottom.

[0034] For example, the curvature of the groove bottom (in a given cross-sectional plane perpendicular to the longitudinal direction) in the central lacing region can be selected from a first (given) range, while the curvature of the groove bottom (in a given cross-sectional plane perpendicular to the longitudinal direction) in each of the two lateral lacing regions can be selected from a second (given) range, the second range (at least partially, preferably completely) being different from the first range, preferably having no common value of curvature.

[0035] In particular, the curvature of the lateral frenulum region is therefore significantly different from that of the central frenulum region.

[0036] Preferably, the wall of the container or the bottom of the trough in each of the two lateral tethering areas curves outward in at least some areas, preferably throughout the entire area of ​​each tethering area.

[0037] It is also conceivable that the walls of the container or the bottom of the trough in each of the two lateral tie-down areas bend inward at least in some areas, preferably throughout the entire area of ​​each tie-down area.

[0038] It is also conceivable that the walls of the container or the bottom of the trough in each of the two lateral tie-down areas are flat or planar in at least some areas, preferably in the entire area of ​​each tie-down area, and / or straight in cross-section.

[0039] In a preferred embodiment, the container wall is curved outward in each of the two lateral lacing regions, while preferably in the central lacing region, the container wall is curved inward. Preferably, each of the two lateral lacing regions has a mirror-symmetrical, identical curvature characteristic.

[0040] Preferably, the container wall always curves inward in the central tie-down area, and the curvature is significantly different from that of the lateral tie-down areas. Specifically, the two lateral tie-down areas and the central tie-down area (circumferentially) positioned between the two lateral tie-down areas are located between two (adjacent) uprights. Furthermore, the surface of the central tie-down area curves inward toward the container or the bottle.

[0041] Preferably, each of the two lateral tether regions forms an outer tether region (viewed from the circumferential direction) and / or an outer groove bottom region. Preferably, (in particular each) groove bottom or (in particular each) tether (viewed in and / or from the opposite direction of the circumferential direction) is defined by one of the two lateral tether regions (towards the adjacent upright foot).

[0042] The walls of the container in the bottom region, particularly in the middle region of the groove bottom (central tie region), are at least partially curved inward, and in the two edge regions of the groove bottom adjacent to the middle region of the groove bottom (partial tie regions), they are curved outward.

[0043] It is also conceivable that the walls of the container in the bottom region, particularly in the middle region of the bottom of the groove (central tie region), are at least partially curved inward, and that the two edge regions of the bottom of the groove adjacent to the middle region of the bottom (partial tie regions) are significantly or less curved inward or straight in cross-section.

[0044] "Inward bending" should be specifically understood as the container walls bending inwards in each region (e.g., towards the inside of the bottle). Correspondingly, "outward bending" should be specifically understood as the container walls bending outwards in each region.

[0045] In this context, "bending inward" and / or "bending outward" specifically refers to bending along the main direction of the (upper) surface, which corresponds to the circumferential direction.

[0046] The advantage of this invention is that the curvature towards the inside of the (bottle) allows the straps to better fit the geometry of the bottom. This makes it easier to position and stretch the material, and to enter the foot or upright leg in a more targeted manner. This preferably avoids the formation of defects and increases stability. Furthermore, inflatability and formability are also improved.

[0047] The longitudinal direction specifically refers to the direction along the central axis of the plastic container. The central axis of the plastic container extends particularly through the container opening (and also particularly through the center of the bottom area of ​​the container, especially through the injection point). In the upright position of the container, the central axis extends particularly parallel to the vertical direction.

[0048] The circumferential direction should preferably be understood as the direction of rotation about the central axis (or longitudinal direction) of the container (chosen as the axis of rotation). In the following, the radial direction (relative to the longitudinal direction) should be understood as the direction relative to the longitudinal direction (or the central axis of the container), which is perpendicular to the longitudinal direction (or the central axis) and, in particular, away from the longitudinal direction (on a straight line, especially in the direction perpendicular to the central axis).

[0049] The circumferential angle should preferably be understood as an angle around the central axis in the circumferential direction, based on the projection onto a plane perpendicular to the central axis. In particular, the circumferential angle extending from the bottom of the groove is measured at the projection of the bottom of the groove onto a plane perpendicular to the longitudinal axis (as the circumferential angle around the central axis).

[0050] Preferably, the matrix is ​​used to accommodate a large volume of (beverage) fill. The matrix has a complete circumferential (side) wall in the circumferential direction. In this case, the matrix can have a substantially circular cross-section (preferably a circular cross-section with a given main diameter, the plane of the cross-section being perpendicular to the central axis). However, the matrix can also have a substantially square or rectangular cross-section, particularly with rounded corners.

[0051] In other words, the bottom region of the central ligature area has a concave or concave outer surface of the container (here, "concave" specifically refers to the straight portion between any selectable points of the surface being entirely outside the container wall). Preferably, such a concave curvature or concave arc is essentially a line segment pointing towards the substrate along the boundary between the central region and the bottom region between and / or around the injection points.

[0052] In particular, the bottom regions of the lateral tie areas have a convex arc or convex outer surface of the container (here, "convex" specifically refers to the straight portion between any optional points of the surface being entirely within the container wall, particularly in the bottom region). Preferably, such a convex curvature or convex arc is substantially a line segment pointing towards the substrate along the boundary between the central region and the bottom region between and / or around the injection points.

[0053] Preferably, the transition region where the substrate enters the bottom region of the container, or the transition region and / or the transition wall (or the curve where the substrate merges into the bottom region of the container), has at least partially, particularly completely, (especially in the case of lines formed (completely) circumferentially on the container or wall (hereinafter also specifically referred to as circumferential lines), and / or lines formed (completely) circumferentially on the container or wall, and / or lines formed on the container or wall that have at least one extending direction in the circumferential direction of the container) an outwardly curved wall (viewed from the inside of the container, approximately radially outward from the central axis of the container). Preferably, the transition (region) does not have (especially longitudinally extending) grooves or inwardly curved regions (especially when considering lines formed in the circumferential direction along the wall of the transition (region).

[0054] Preferably, at a point along a longitudinally oriented line formed along the outer (and / or inner) wall of the container, particularly at any point in the region where the bottom area transitions to the substrate, the tangent has a completely longitudinal directional component. Preferably, the transition region follows a direction corresponding to the side surface of the cylinder.

[0055] A groove should be understood as a geometric structure that extends inward at a normal horizontal level relative to the (surrounding) wall of the container, i.e., the (outer) wall of the bottom area, in particular relative to the circumferential wall (especially in the direction of the container opening and / or the central axis).

[0056] The bottom of the groove should be understood as a (partial) area of ​​the groove that differs from at least one other area by its (uniform or common) geometry, such as uniform parameters of surface parameterization and / or the selection of surfaces (or common rules of surface structure), particularly from the rest of the groove and / or from the foot flank surface of the upright foot.

[0057] The bottom of the groove should be understood as, for example, the (particularly continuous) region of the recess that extends substantially inward (to the farthest point) to form the (smallest) area (and the area surrounding that area). In this case, the bottom of the groove is preferably different from the rest of the recess because it is constructed with a different surface shape compared to the rest of the groove, particularly different from the region of the groove laterally adjacent to the bottom of the groove, which lies between the bottom of the groove and the upright. Preferably, the aforementioned region adjacent to the bottom of the groove and located between the bottom of the groove and the upright is (overall) part of the foot side of the upright (particularly constructed accordingly).

[0058] Preferably, the groove bottom and / or central lacing region and / or the two lateral lacing regions extend radially outward from the injection point or the central region surrounding the injection point (along the longitudinal direction of the bottom wall), substantially to (or almost to) the substrate. Preferably, at least 75%, preferably at least 80%, particularly preferably at least 90% of the arc length of the extension line of the groove and / or groove and / or central lacing region and / or the two lateral lacing regions, this line originates from the injection point and / or the central region and extends radially outward on the bottom wall until it forms a line in the substrate.

[0059] Preferably, the groove and / or its bottom (especially at least one groove and / or its bottom extending between two uprights) extends in the radial direction (at least one component). Preferably, in the projection of the groove or its bottom onto a plane perpendicular to the longitudinal axis, the main direction of extension of the groove and / or its bottom is substantially, in particular, exactly in the radial direction.

[0060] Preferably, at least one, and preferably exactly one, groove (with a groove bottom extending at a (given) circumferential angle) is arranged between every two (lateral or circumferential) adjacent standing feet, wherein preferably, each groove has a main extension direction extending in the radial direction (wherein in particular, at least one component of the main extension direction points in the radial direction in each case).

[0061] Preferably, the bottom of each groove (and / or each recess) extends substantially along each bottom height portion of the groove bottom (where the bottom height of a portion is measured longitudinally with the elevation of the container as a reference plane), and in particular, extends substantially at the same (given) circumferential angle. This means that the area of ​​the groove bottom near the vertical surface extends at substantially the same (given) circumferential angle as the area of ​​the groove bottom near the base and / or opening (viewed longitudinally).

[0062] In other words, the projection of the bottom of the tank and / or the projection of the central tethering area and / or (in particular, the projections of the respective) lateral tethering areas (relative to the longitudinal direction) occupy a segment of their respective projection planes (the bottom area) on the vertical plane of the container (which is arranged perpendicular to the longitudinal direction), which can be defined and / or described essentially by circumferential angles.

[0063] Preferably, each groove base is arranged substantially and preferably completely symmetrically (relative to the circumferential direction) between two (adjacent) uprights. Preferably, each groove and / or groove base is axially symmetrical with respect to the plane extending longitudinally along the central axis of the container and along the radial direction (viewed in the circumferential direction) of the geometric center of the groove and / or groove base.

[0064] Preferably, at the geometric center of the groove, particularly at the geometric center of the bottom, there is a wall region of the bottom area that extends furthest (radially and / or toward the central axis) into the container relative to the circumferential wall portion. In other words, in the case of a line formed (completely) circumferentially along the bottom wall (particularly along the outer surface of the bottom area), the line segment at the geometric center of the bottom is closest to the central axis. Preferably, this circumferential line (completely) has at least one inward curvature in the bottom area, preferably throughout the entire bottom area. If a portion of the bottom area forms a plane perpendicular to the central axis, then this plane bends inward (towards the central axis) throughout the bottom area (particularly throughout the entire area). Preferably, the turning areas where this curvature and / or bending is reversed and / or whose direction is changed are located outside the (completely) bottom.

[0065] In a preferred embodiment, the central tether region extends at least along the geometric center of the tank bottom, preferably symmetrical with respect to the geometric center. In particular, the walls of the container are at least partially curved inward, preferably substantially along the geometric center of the tank bottom (especially when considering that the principal orientation of the surface corresponds to the circumferential orientation). This symmetrical arrangement results in a particularly stable bottom geometry.

[0066] In a preferred embodiment, the trough bottom has at least one first turning region and a second turning region, in which the surface regions of the trough bottom change the direction of their curvature. Preferably, in the first turning region, the direction of the first lateral lacing region (outward curvature) changes to the direction of the central lacing region (inward curvature). Furthermore, in the second turning region (different from the first turning region), the direction of the central lacing region (inward curvature) changes to the direction of the second lateral lacing region (outward curvature).

[0067] Preferably, the surface of the trough bottom region has at least one (particularly each) line extending in a circumferential direction (particularly not extending in a longitudinal direction), a first turning region, wherein the surface region of the trough bottom changes the direction of its curvature, particularly from an outwardly curved region to an inwardly curved region. Furthermore, the line has a second turning region, in which the surface region of the trough bottom changes the direction of its curvature, particularly from an inwardly curved region to an outwardly curved region.

[0068] In a preferred embodiment, the tie (particularly achieved by the bottom of the trough) is a freely shaped bottom portion. Specifically, compared to the prior art containers mentioned at the beginning, the original rotating surface is replaced by a freely shaped surface. This freely shaped portion allows for a more purposeful distribution of material within the tie. In particular, it avoids (visible) deformation that could weaken the tie. This increases the stability of the bottom.

[0069] Freeform surfaces are understood to be, in particular, three-dimensional, usually hyperbolic surfaces, which are preferably (and especially uniquely) mathematically represented by splines (sheet polynomial functions) and / or by NURBS (non-uniform rational B-splines).

[0070] In particular, the straps or groove bottom are constructed as a free-form surface that connects to the surface edge or transition zone on the side of the foot, which is laterally aligned on the upright foot and connected to the base of the container and the central region or injection point around the injection point, particularly in a tangentially continuous and especially curvature-continuous manner. The curvature process of the free-form surface of the groove bottom in (any) given direction can be described by a polynomial of the power of n.

[0071] Preferably, at least two, and more preferably at least three characteristic parameters of the freeform surface at the bottom of the groove are selected and / or determined, for example, approximated, so that the geometry of the freeform surface approximates a spherical region, particularly having a hemispherical (segmented) shape.

[0072] In an advantageous embodiment, in a cross-section perpendicular to the longitudinal direction of the container, the cross-sectional profile of the bottom of the trough at least partially, preferably substantially completely, follows an nth-order spline, deviating at least partially from a circular path, particularly in the central tie-down region and / or the two lateral tie-down regions. This causes the surface (of the central tie-down region) to curve inward toward the bottle, allowing its cross-section to change, which is advantageous. The effect of doing so is that the tie-downs better conform to the geometry of the bottom.

[0073] In a preferred embodiment, at least one groove base (preferably each groove base between the two uprights) has a circumferential angle between 0.5° and 30°, preferably between 2.5° and 20°, preferably between 5° and 15°, preferably between 5° and 10°, preferably between 6° and 9°, and particularly preferably 7.5°. In this way, a sufficiently functional tether can be achieved. Preferably, the groove base between the two uprights (one groove base in each case) extends circumferentially, this extension corresponding to an angle segment exceeding a given circumferential angle. Viewed circumferentially, the groove base thus extends along its entire length in the longitudinal direction by the given circumferential angle (essentially just exceeding).

[0074] In another advantageous embodiment, the bottom of the tank (especially in cross-section) is substantially symmetrical with respect to the geometric center of the tank bottom. The symmetrical design results in particularly uniform material distribution and stretching.

[0075] In a preferred embodiment, the circumferential angle of the central lacing region is between 0.1° and 10°, preferably between 0.5° and 5°, and more preferably between 1.5° and 3°. Providing internal curvature within such a selected range of circumferential angles allows for particularly targeted distribution of material during the expansion of the container.

[0076] In a preferred embodiment, the ratio of the circumference angle extending from the central frenulum region to the circumference angle extending from the two lateral frenulum regions (total) is between 1:0.1 and 1:40, preferably between 9:1 and 1:19, preferably between 1:1 and 1:4, preferably between 1:2 and 1:3, and particularly preferably substantially 1:2.33.

[0077] Preferably, the ratio of the circumference angle extending from the central frenulum region to the circumference angle extending from the two lateral frenulum regions (total) is between 90%:10% and 5%:95%, more preferably between 50%:50% and 20%:80%, more preferably between 35%:65% and 25%:75%, and particularly preferably essentially 30%:70%.

[0078] Preferably, (in particular) each lateral lacing region is a flank of the lacing.

[0079] Preferably, the ratio of the circumferential angle extending (at least partially, preferably throughout the entire longitudinal direction) of the lateral frenulum area (particularly each), referred to as the "lateral circumferential angle," to the circumferential angle extending (at least partially, preferably throughout the entire longitudinal direction) of the central frenulum area, referred to as the "central circumferential angle," is between 5%:90% and 47.5%:5%, preferably between 25%:50% and 40%:20%, and particularly preferably (essentially) 35%:30%.

[0080] Preferably, the ratio between the side circumference angle of the lateral lacing portion, the center circumference angle of the center lacing portion, and the side circumference angle of the second lateral lacing portion is between 5%:90%:5% and 47.5%:5%:47.5%, more preferably between 25%:50%:25% and 40%:20%:40%, and particularly preferably (basically) 35%:30%:35%.

[0081] This results in a particularly advantageous interaction between the inwardly curved bottom region (through the central tie region) and the outwardly curved bottom region (the lateral tie region), thereby distributing particularly favorable forces onto the matrix, leading to exceptionally good material distribution during container production. The tie designed in this way achieves a high level of ground stability, while further enhancing the tie's strength through significantly improved tensile properties.

[0082] Preferably, the (maximum) circumferential angle extending from the central lacing region is smaller than the (maximum) circumferential angle extending from each of the lateral lacing regions. This advantageously reduces the contact surface that the material first comes into contact with during stretching, thereby resulting in a more ideal material distribution.

[0083] In another advantageous embodiment, the curvature of the cross-sectional profile of the tank bottom, appearing in the cross-section along the longitudinal direction of the container through the tank bottom, particularly through the central tie-down region and / or the lateral tie-down regions (preferably along the geometric center of the tank bottom), is a profile offset towards the geometric center of the bottom along the length of the central tie-down region. This offset is minimal at the end of the central tie-down region closest to the injection point / bottom center, and increases accordingly in the longitudinal direction with increasing radial distance from the central axis and increasing width of the tie-down region (in the circumferential direction). Therefore, the maximum offset is found at the upper end of the central tie-down region with the greatest radial distance from the central axis.

[0084] In the lower region, the offset is between 0.001% and 1% of the total bottom diameter, preferably between 0.01% and 0.2%. In the upper region, the offset is between 0.01% and 3% of the total bottom diameter, preferably between 0.03% and 0.05%.

[0085] Preferably, the tether or groove bottom has a so-called main tether area (hereinafter also referred to as the central tether area relative to the longitudinal direction (different from the expression "central tether area", where "central" specifically refers to the center of the circumferential direction, preferably between two lateral tether areas).

[0086] Preferably, the main frenulum region (viewed longitudinally), and especially the entire region, is positioned between the upper frenulum region and the lower frenulum region.

[0087] In particular, the upper tie region forms a connection with the container (base) or the container sidewall. Preferably, the upper tie region curves outward (viewed in a cross-section extending perpendicular to the longitudinal direction), particularly preferably along the entire extended region, and / or follows the corresponding curvature of the adjacent container (base).

[0088] Preferably, the lower tether region forms an inlet leading to the center of the container bottom and / or the container's injection point. Preferably (viewed in a cross-section extending perpendicular to the longitudinal direction), the lower tether region is straight or without curvature. Preferably, the lower tether region is substantially at least partially, preferably entirely, flat or planar.

[0089] Preferably, an upper transition region is provided between the upper lacing belt region and the main lacing belt region, which is preferably constructed as a freely shaped surface. Preferably, the main lacing belt region is not directly adjacent to the upper lacing belt region, but is adjacent to the upper transition region, which in turn is adjacent to the upper lacing belt region. The upper transition region has the function of transferring the curvature of the main lacing belt region to the curvature of the upper lacing belt region (especially when viewed in cross-sections extending perpendicular to the longitudinal direction). Therefore, preferably, when viewed in the longitudinal direction, the main lacing belt region and the upper lacing belt region are spaced apart.

[0090] Preferably, a lower transition region is provided between the lower fretting band region and the main fretting band region, which is preferably constructed as a freely shaped surface. Preferably, the main fretting band region is not directly adjacent to the lower fretting band region, but is adjacent to the lower transition region, which in turn is adjacent to the lower fretting band region. The lower transition region particularly functions to transfer the curvature of the main fretting band region to the curvature of the lower fretting band region (especially when viewed in cross-sections extending perpendicular to the longitudinal direction). Therefore, preferably, when viewed in the longitudinal direction, the main fretting band region and the lower fretting band region are spaced apart.

[0091] Preferably, the frenulum in the main frenulum region bends inward in the central frenulum region (relative to the circumferential direction), particularly along its entire longitudinal direction.

[0092] Preferably, the main frenulum region has a central frenulum region (relative to the circumferential direction) and two lateral frenulum regions along its entire longitudinal direction.

[0093] Preferably, the main frenulum region, particularly the central frenulum region and / or the lateral frenulum region, preferably extends at least 30% of the longitudinal direction of the frenulum (particularly through the arc length of the frenulum in the longitudinal section of the frenulum, preferably through the geometric center of the central frenulum region), preferably at least 40%, preferably at least 50%, preferably at least 70%, preferably at least 80%, and particularly preferably at least 90%.

[0094] The main frenulum region or the central frenulum region relative to the longitudinal direction preferably extends the longitudinal direction of the frenulum (in particular, through the frenulum arc length in the longitudinal cross-section of the frenulum, preferably through the geometric center of the central frenulum region) by a maximum of 95%, particularly preferably a maximum of 70%.

[0095] Preferably, the main frenulum region or the central frenulum region relative to the longitudinal direction extends 50% to 70% of the longitudinal direction of the frenulum.

[0096] In another advantageous embodiment, the area of ​​the bottom portion between the upright foot and the bottom of the groove extends through the bottom of the groove in a tangentially continuous and / or curvature continuous manner. This also results in particularly good tensile strength of the material at the toe.

[0097] In an advantageous embodiment, the portion of the trough bottom, preferably each portion of the trough bottom, can be described by a spline passing through the portion of the upright foot side connected to the spline in a manner of tangential continuity and / or curvature continuity (a relatively steep area in the upright region of the upright foot).

[0098] In another advantageous embodiment, the bottom of each groove (between two adjacent bases) extends through the remaining area of ​​the groove (and / or the base area) and / or the foot flank surface (of the base), its main direction of extension extending (substantially entirely) radially along the base area wall, and in particular not circumferentially.

[0099] Preferably, the transition area from the bottom of (each) groove into the remaining area of ​​the groove and / or into the foot wing surface (of the upright foot) is given by a line formed on the bottom area, which extends (substantially entirely) radially rather than circumferentially along the bottom area.

[0100] In another advantageous embodiment, the curvature of the line formed along the bottom region, preferably the bottom line, extends from or around the upright foot through at least one groove bottom, and the variation of the groove bottom is less than 30%, preferably less than 25%, more preferably less than 20%, and even more preferably less than 15%.

[0101] Preferably, the container has several grooves and / or recesses of the same shape. In particular, all the recesses and / or grooves between the two feet have the same shape.

[0102] In another advantageous embodiment, the width of the tank bottom (particularly the width measured in the circumferential direction) extends outward in the radial direction of the container and / or increases with the radial distance from the central axis.

[0103] In another advantageous embodiment, (preferably each) a region located in the bottom portion between the upright foot and the groove bottom extends through the groove bottom in a tangentially continuous and / or curvature-continuous manner. In other words, a (particularly each) region located in the bottom portion of the laterally adjacent groove bottom (particularly the foot wing surface) extends through the groove bottom (viewed in the circumferential direction) in a tangentially continuous and / or curvature-continuous manner. In this paragraph, tangential or curvature continuity is particularly seen when taking into account the transition in the circumferential direction and / or along the bottom line and / or in the radial viewing direction. Such a tangentially continuous and / or curvature-continuous transition provides the advantage that the plastic material to be distributed during blow molding can be moved or stretched, for example, from the bottom of the groove (along the foot wing surface) to the upright foot, while the friction caused by the geometry (of the corresponding blow mold) is minimized.

[0104] In another advantageous embodiment, the bottom of the tank follows a circular, spherical orientation at least in a portion of its area (preferably at least circumferentially, between the two uprights), particularly substantially along its entire radial extension. Preferably, the bottom area between each pair of (adjacent) uprights has a region (extending substantially from the central area and / or injection point to the base of the container) having a spherical (segmental) shape. The advantage of this is that the advantageous geometry of the spherical (segmental) walls in terms of force transmission can be largely preserved, and the surface processes of the walls (generally) approximate the spherical (segmental) orientation.

[0105] Preferably, the bottom of the trough deviates (essentially) exactly from the hemispherical (segmental) shape of the wall portion or orientation, at least partially, particularly in the area between the two uprights (each) and in the circumferential direction. In other words, it is preferable that no area of ​​the trough bottom follows a strictly geometric hemispherical orientation.

[0106] The hemispherical orientation of the region can be understood in particular as the region deviating from the radius of the sphere by no more than 20%, preferably no more than 10%, more preferably no more than 5%, and especially preferably no more than 2.5% (particularly in the radial direction relative to the center of the approximate sphere).

[0107] Preferably, the bottom of the trough is at least partially, preferably, a selected portion of the bottom (particularly its entire circumferential extent) between two uprights, particularly preferably, its entirety is between two (hypothetical) spherical surfaces whose radii deviate from each other by less than 20%, preferably less than 10%, preferably less than 5%, particularly preferably less than 2.5%.

[0108] Preferably, the line formed along the geometric center between two adjacent uprights and / or the geometric center of the groove and / or the bottom of the groove on the wall deviates from the radius of the approximate circle by at least partially (at each point on the formed line) by less than 20%, preferably less than 10%, more preferably less than 5%, and particularly preferably less than 2.5%, relative to the geometric distance between the formed line and the approximate circle. Preferably, the formed line occupies more than 20%, preferably more than 30%, more than 40%, more than 50%, more than 60%, more than 70%, more than 80%, and particularly preferably more than 85% of the arc length of the connecting line formed on the wall, passing through the geometric center between two adjacent uprights and / or through the geometric center of the groove and / or the bottom of the groove, which is, on the one hand, the center and / or injection point of the bottom, and on the other hand, the transition from the bottom region to the body. Preferably, this formed line can be described by an nth-order spline (at least partially, preferably within the range of more than 85% of the arc length). However, it is also conceivable that this formed line can be described by a circular line.

[0109] In another advantageous embodiment, the bottom (or tie) is not a rotationally symmetric surface about the central axis of the container (particularly in its entirety, and preferably not at least partially). This distinguishes the structure of the bottom from that known in the prior art, where the basic profile of the tie rotates about the central axis at both ends of the angular segment via tie angles. The advantage of deviating from the rotationally symmetric surface portion is that it can accommodate the direction of the curve (particularly in terms of curvature) while maintaining a generally hemispherical segmental shape.

[0110] The opening area preferably has external threads and / or a support ring. Preferably, the bottom area has an injection point, particularly located on the central axis, and the bottom area preferably has a central area surrounding the injection point, particularly with a rotationally symmetrical design. Preferably, viewed longitudinally, the injection point is located above the container foot (when the container is upright).

[0111] Preferably, the upright legs or the outer surface of the upright legs form particularly flat, especially extending (entirely) in a plane perpendicular to the longitudinal direction, preferably at least partially annular, upright portion of the plastic container extending at a given circumferential angle.

[0112] Preferably, the container has a filling capacity of at least 0.1 liters, more preferably at least 0.2 liters, more preferably at least 0.3 liters, more preferably at least 1 liter, more preferably at least 1.5 liters, more preferably at least 2 liters, more preferably at least 3.5 liters, and particularly at least 5 liters (for beverages). Preferably, the maximum filling capacity of the container is 5 liters, more preferably 3.5 liters, more preferably 2 liters, more preferably 1.5 liters, and more preferably 1 liter. Preferably, the filling capacity of the container is between 2 liters and 3.5 liters.

[0113] Preferably, the container is suitable for carbonated beverages.

[0114] Preferably, the bottom portion has three or more upright legs, more preferably four or more, more preferably five or more, and particularly preferably seven or more upright legs. Preferably, the bottom portion has fewer than ten upright legs, more preferably fewer than eight, more preferably fewer than six, and particularly preferably fewer than four. Preferably, the container has a petal-shaped bottom.

[0115] Preferably, the bottom of the container is axially symmetrical with respect to the central axis.

[0116] In another advantageous embodiment, the bottom of the container has a substantially constant wall thickness, at least in a portion, preferably across the entire surface. Specifically, the wall thickness of the bottom region and the bottom region is substantially the same. In this way, maximum stability of the container or its bottom can be achieved with minimal material.

[0117] Preferably, the basic profile of the container bottom region can be described by the basic profile of the bottom region, which preferably begins with a straight portion (particularly starting from the geometric center of the container and / or the injection point and / or the central portion), followed by a spline or curved portion. This curved portion is preferably followed by a further curved portion or spline, preferably a further curved portion, through the base of the bottom region. The bottom region, particularly the upright foot and / or upright area, is generated by rotating the bottom profile about the central axis of the container selected as the axis of rotation. Explicit reference is made to the applicant's patent application DE 10 2013 110 139 A1, which describes this preferred geometry of the foot region of the bottom region (in which the bottom portion is located) (and in... Figure 2 and Figure 3 (See description in the document). All features relating to the region of the upright foot (and its curvature) described in this application are also considered to be disclosed herein by reference.

[0118] Preferably, the region laterally adjacent to the bottom of the tank (viewed circumferentially) is the foot wing surface of the container's upright leg. The foot wing surface is preferably designed as a free-form surface, which is preferably connected to the surface edge of the foot and / or foot region, particularly to the surface edge of the substrate (especially the central region and / or injection point), especially in a tangentially continuous and preferably curvature-continuous manner. The free-form surface, in particular, is a surface whose curvature process in one direction can be described by a polynomial of the power of n.

[0119] Preferably, the surface of the foot side is formed as a freeform surface, particularly around a portion of the freeform surface connected to the surface edge of an imaginary (or hypothetical; for construction) rotationally symmetric lacing surface (or trough bottom), particularly tangentially continuous, and preferably curvature continuously continuous. This has the advantage of preserving the geometry of the container bottom in the prior art.

[0120] A further object of the present invention is to provide a blow molding apparatus for manufacturing plastic containers, having an inner wall to which the plastic container can expand during the blow molding process.

[0121] According to the invention, the inner wall has a profile suitable for and intended for the production of plastic containers, wherein the plastic containers can be designed to have all the aforementioned features related to plastic containers, either individually or in combination with each other.

[0122] In particular, the blow molding device includes a bottom portion that is adapted and designed to manufacture a bottom portion of the type described above.

[0123] A further object of the present invention is to provide a plastic container, particularly a plastic container for beverages, having a bottom region, a base connected to the bottom region in the longitudinal direction of the plastic container, and a container opening connected at least indirectly to the base in the longitudinal direction.

[0124] The bottom region has at least three upright legs, preferably at least five upright legs, and particularly preferably exactly five upright legs. At least one groove is provided between two, particularly adjacent, upright legs, the groove having a bottom extending at a (given) circumferential angle in the circumferential direction. The bottom of the groove serves as a strap. In particular, the design of the bottom at the (given) circumferential angle (especially by its shape) makes it suitable for serving as a strap. Furthermore, the container is preferably integrally formed.

[0125] According to the invention, each (particularly each) trough bottom (or tie) has a central tie region (and particularly two lateral tie regions) in which the container wall is curved inward and this region is located between the two lateral tie regions in the circumferential direction.

[0126] According to the invention, the groove bottom in the cross section perpendicular to the longitudinal direction (i.e., particularly within the cross section extending perpendicular to the longitudinal direction) preferably has a curvature in the central lacing region that is at least partially (and preferably throughout the entire central lacing region) greater than that in the groove bottom in the two lateral lacing regions.

[0127] The plastic container can be equipped with all the features mentioned above related to plastic containers, either individually or in combination.

[0128] The direction of curvature of the groove bottom in the lateral tether regions, preferably in the two lateral tether regions, may be the same as the direction of curvature or arcuate curvature of the groove bottom in the central tether region. Alternatively, the direction of curvature of the groove bottom in the lateral tether regions, preferably in the two lateral tether regions, may be opposite to the direction of curvature or arcuate curvature of the groove bottom in the central tether region. It is also conceivable that the groove bottom in the lateral tether regions, and preferably in the lateral tether regions, is flat or horizontal and / or straight or without curvature in cross-section.

[0129] A further object of the present invention is to provide a plastic container, particularly a plastic container for beverages, having a bottom region, a base connected to the bottom region in the longitudinal direction of the plastic container, and a container opening connected at least indirectly to the base in the longitudinal direction.

[0130] The bottom region has at least three upright legs, preferably at least five upright legs, and particularly preferably exactly five upright legs. At least one groove is provided between two, particularly adjacent, upright legs, the groove having a bottom extending at a (given) circumferential angle in the circumferential direction. The bottom of the groove serves as a strap. In particular, the design of the bottom at the (given) circumferential angle (especially by its shape) makes it suitable for serving as a strap. Furthermore, the container is preferably integrally formed.

[0131] According to the invention, each (particularly each) trough bottom (or tie) has a central tie region (and particularly two lateral tie regions) in which the container wall is curved inward and this region is located between the two lateral tie regions in the circumferential direction.

[0132] According to the invention, the curvature of the groove bottom in the central frenulum region is at least partially greater than the curvature of the groove bottom in the two lateral frenulum regions (particularly regardless of the direction of any curvature in each frenulum region).

[0133] The plastic container can be equipped with all the features mentioned above related to the two plastic containers, either individually or in combination.

[0134] Preferably, the curvature direction of the groove bottom in the central lacing region can be the same as or opposite to the curvature direction of the groove bottom in the lateral lacing regions. It is also conceivable that the groove bottom in the lateral lacing regions (at least partially or entirely) has no curvature.

[0135] Further advantages and implementation methods are derived from the accompanying drawings, in which:

[0136] Figure 1 A schematic diagram of a plastic container is shown;

[0137] Figure 2-5Different schematic diagrams of the bottom region of a plastic container according to one embodiment of the prior art are shown;

[0138] Figure 6-9 Different schematic diagrams of the bottom region of a plastic container according to one embodiment of the present invention are shown;

[0139] Figure 10 It shows Figure 9 A schematic diagram of an enlarged circular cross-section of the bottom region shown;

[0140] Figure 11 A longitudinal cross-sectional view of the tether is shown; and

[0141] Figures 12a-12d An exemplary illustration is shown to depict the bottom of a container for describing the cross-section of the ties.

[0142] Figure 1 A schematic diagram of a plastic container 1 is shown. This plastic container has an opening region 6 with a container spout 8 and a base 50 adjacent to the opening region 6. The base 50 is used to hold a large quantity of filling material. The shape of the base can also be... Figure 1 The design may vary; for example, it may have waves or patterns. The opening region 6 may have the external thread of the plastic container 1 and a support ring located at the container opening 8. The container according to the invention also preferably has an external thread and a support ring.

[0143] In the attached figure, reference numeral L indicates the longitudinal direction of the plastic container 1. As shown, the longitudinal direction L is along the central axis M of the container. Furthermore, Figure 1 The circumferential direction U is shown, which is the direction around the central axis or the longitudinal direction L as the axis of rotation.

[0144] The base area 2 of the plastic container 1 is adjacent to the base body 50, thereby allowing the base body 50 to pass through the bottom area 2 either through a curved portion or through a non-curved portion.

[0145] Reference numeral 22 indicates the upright legs of the container (not shown here) (see, for example, see...) Figure 2 The bottom region 2 may have multiple upright feet 22, enabling it to stand upright on a straight surface. The reference numeral R refers to the radial direction relative to the central axis M or the longitudinal direction L of the plastic container. The radial direction R is perpendicular to the central axis M and the longitudinal direction L, and either faces them or faces outwards away from them. The base 50 is specifically composed of or has sidewalls. These sidewalls extend fully in the circumferential direction U of the container.

[0146] Figure 2-5 Using different perspectives ( Figure 2 , 3 and 5) or cross-sectional view ( Figure 4The diagram shows the bottom region 2 of a (plastic) container. This is a bottom portion known in the prior art. Five upright legs 22 can be seen, on which the container can stand. Reference numerals 24 all denote the area of ​​bottom region 2, which extends radially outward from the center of the central axis M, and all include the (precise) upright legs 22. Preferably, viewed from the circumferential direction U, the upright region 24 does not extend beyond the upright legs 22. Preferably, the upright region 24 is the area of ​​bottom region 2 defined by a given angular segment relating to rotation about the central axis M as an axis of rotation in the circumferential direction U.

[0147] The upright regions 24 converge radially along the central axis M and meet at the bottom center, which in this case is the injection point 18 of the container. In the positioning of the container on the upright plane, the injection point 18 preferably does not contact this upright plane. Viewed in the longitudinal direction L, the injection point 18 is located above the upright foot 22, that is, closer to the opening region than the upright foot 22.

[0148] Preferably, a groove 30 is formed between every two adjacent upright legs. In particular, the groove should be understood as a geometry that extends inward (i.e., closer to the central axis) relative to the circumferential wall, i.e., the wall of the bottom region, for example (especially relative to the outer wall of the container in the circumferential direction of the leg region).

[0149] Two reference numerals 33 denote the bottom of the groove. The bottom 33 is the area surrounding the geometric center 34 of the groove. Preferably, the bottom is an area that functions as a strap, similar to a "seatbelt," to maintain the position of the bottom center even under the influence of internal pressure and temperature. To this end, the force acting on the bottom center, or bottom center—such as the injection point of a plastic container—is transmitted to the sidewalls of the plastic container through the strap.

[0150] exist Figure 2 and Figure 3 In the embodiment of the prior art container shown, the bottom 33 of the tank follows a substantially hemispherical orientation. Each individual line on the bottom region 2 of the bottom 33 extends radially outward, towards the sidewall, or towards the substrate at the injection point 18, forming along the outer surface of the container, resembling or following a circular line orientation. This choice of geometry for the bottom 33 has proven advantageous, particularly in terms of the longitudinal transmission of forces acting at the injection point to the sidewalls of the substrate 4.

[0151] The reference numeral BQ in the attached figure indicates the boundary line of the bottom region 2 (preferably with a substantially circular cross-section (relative to a plane perpendicular to the longitudinal or central axis), where the bottom region 2 connects with the substrate.

[0152] Figure 4 The first two images were shown. Figure 2 and 3 The illustration of container 1 shows that it is divided in two along a cross section running along the central axis M or longitudinal direction L of the container, which is here along the geometric center 34 of the bottom 33 of the tank, through the injection point 18 and the upright foot 22.

[0153] Reference numeral 40 in the attached figure indicates the cross-sectional profile of the bottom of the groove, which here runs along the geometric center 34 of the bottom of the groove 33.

[0154] Figure 6-9 Different illustrations are shown of the bottom region 2 of a plastic container 1 according to one embodiment of the present invention. In this respect, Figure 6 , 7 Figures 9 and 1 respectively show illustrations of the bottom region 2 of the (plastic) container in different perspective views, while Figure 8 A cross-sectional view of the bottom region is shown.

[0155] and Figure 2-5 Similarly, this is also a petal-shaped base. Furthermore, the base area 2 shown here also has five upright legs 22, each with a corresponding upright area 24. The design of these upright legs is preferably similar to... Figure 2-5 The upright legs shown in the prior art are exactly the same.

[0156] Similar to the bottom region in the prior art, the bottom region 2 shown here also has a groove bottom 33 that functions as a tie. A groove bottom 33 is provided between every two upright regions 24. The different upright regions and groove bottoms 33 are of substantially the same design. In this case, reference numeral 34 indicates the geometric center of the respective groove bottom 30, and reference numerals 32 and 34 respectively indicate the lateral tie areas of the groove bottom 33. These areas preferably extend substantially along two corner segments relative to the circumferential angle (relative to the central axis of the plastic container), preferably are distinct from each other, and preferably, viewed in the longitudinal direction L, cover substantially the entire extent of the bottom region 2.

[0157] Preferably, the two lateral tether regions 32 and 34 of the bottom of the groove 33 are disposed on the sides opposite to the geometric center 34 of the tether or the bottom of the groove 33.

[0158] exist Figure 6-9 In the illustrated embodiment, the bottom region 2 has a central tie region 44, the surface of which curves inward toward the inside of the bottle. This inward curve has the effect that the tie better conforms to the geometry of the (base), thus allowing the material to be advantageously and more easily stretched into the uprights.

[0159] From the bottom region 2 of the prior art (by Figure 2-5 (As shown) Starting with the container according to the invention Figure 6-9The bottom region 2 shown is constructed, according to a preferred embodiment, in such a way that the initial rotating surface between the (upright) feet, particularly the lacing, is replaced by a free-formed surface. This free-formed cross-section allows for a more purposeful distribution of material within the lacing.

[0160] Figure 8 The first two attached images are shown. Figure 6 and 7 The diagram of container 1 shows a cross-section of the container along its central axis M or longitudinal direction L, which here is along the geometric center 34 of the bottom 33 of the tank, through the injection point 18 and the upright foot 22.

[0161] Figure 8 Note that the cross-section of the surface of the tank bottom or tie (not only curved inwards into the bottle, but also the surface itself) is variable, allowing for better and more targeted distribution and pretreatment of the material. Reference numeral 40 indicates the cross-sectional profile of the tank bottom or tie according to the current state of the art (e.g., by...). Figure 2-5 It indicates, especially comparison Figure 4 Reference numeral 42 indicates one embodiment of the cross-sectional profile of the bottom 33 or tie according to an embodiment of the invention. A comparison of the two cross-sectional profiles 42 and 40 shows that the cross-sectional profile 42 according to one embodiment of the invention is closer to the central axis M, particularly in the region at the center height of the bottom 2 of the container relative to the longitudinal direction L.

[0162] Figure 6-9 The embodiment shown has the advantage of avoiding defects. Furthermore, stability is improved. Additionally, inflatability / formability is also advantageously improved.

[0163] Figure 10 It shows Figure 9 The diagram shows an enlarged circular cross-section K of the bottom region 2, in which two adjacent upright legs 22 and the bottom of the groove between them can be seen. There are two lateral lacing regions 32 and 34 and a central lacing region, which is indicated by the arrow 35 in the attached figure.

[0164] This enlarged illustration shows that the central lacing region at the upper edge curves inward (towards the interior of the container). This central lacing region extends along the geometric center 34 of the tank bottom 33 (essentially along the entire length of the bottom wall region formed by the geometric center 34 of the tank bottom). In contrast, the two lateral lacing regions 32 and 34 curve either inward or outward (as shown in the enlarged illustration). Figure 9 Each region is preferably similar to a spherical segment or a straight line.

[0165] Figure 11A longitudinal section of the tether is shown, that is, a cross-section through the tether or groove bottom of the container or the container bottom 2 (here, the central tether region), which extends in the longitudinal direction L, particularly along the central axis M of the container.

[0166] Reference numeral 3 in the attached figure indicates the bottom interior. Figure 11 Above the bottom area shown (in the plane of the figure), the bottle (base) body 50 is connected (not shown here, but the location of the bottle body is indicated by the reference numeral 50 in the figure).

[0167] It is clear that the longitudinal route of the frenulum is preferably divided into different sections (viewed longitudinally), particularly in the central frenulum region. In the longitudinal section between S1 and S2, there is a so-called "upper frenulum region" 49, which is preferably curved outwards. In the longitudinal section between S2 and S3, there is preferably an upper transition section 48. Specifically (in the longitudinal section between S3 and S4 in the figure), this is immediately followed by the main frenulum region 45 (relative to the center in the longitudinal direction). Next is the lower transition region 47 of the longitudinal section between S4 and S5, preferably the lower frenulum region 46, which is preferably designed to lead to the entrance at the bottom center or injection point 18.

[0168] The main frenulum region 45 or the central frenulum region relative to the longitudinal direction L preferably extends at least 30%, preferably at least 40%, preferably at least 50%, and particularly preferably 70% of the longitudinal direction of the frenulum (especially through the frenulum arc length in the longitudinal cross-section of the frenulum, preferably through the geometric center of the central frenulum region).

[0169] The main frenulum region 45 or the central frenulum region relative to the longitudinal direction l preferably extends the longitudinal direction of the frenulum (particularly through the frenulum arc length in the longitudinal cross section of the frenulum, preferably through the geometric center of the central frenulum region) by a maximum of 95%, preferably a maximum of 70%.

[0170] Preferably, the main frenulum region or the central frenulum region relative to the longitudinal direction L extends 50% to 70% of the longitudinal direction of the frenulum.

[0171] Preferably, the frenulum within the main frenulum region 45 bends inward in the central frenulum region (relative to the circumferential direction).

[0172] Reference numeral 40 indicates a longitudinal section of the tie at the bottom of a container according to the current state of the art.

[0173] Reference numeral 42 indicates a longitudinal section of the tether according to a preferred embodiment of the invention.

[0174] Figure 12a An exemplary illustration is shown to depict the bottom of a container for describing the cross-section of the ties, in particular, except for Figure 11Outside of the various frenulum areas shown.

[0175] Reference numeral 22 indicates an upright foot, and reference numeral 21 indicates the side wing surface of the foot, which is preferably designed as a freely shaped transition section. Reference numeral 33 also indicates the bottom of the groove (dark gray color), where the tether is formed.

[0176] In particular, the upper tie region 49 is directly connected to the container base 50. Preferably, the upper tie region 49 is curved outward (particularly throughout the entire region), especially in the cross-section perpendicular to the longitudinal axis and / or the central axis (i.e., particularly in the cross-section perpendicular to the longitudinal extension). Preferably, the upper tie region 49 forms a connection with the bottle body.

[0177] Figure 12b This illustrates the outward bending of the upper lacing region 49 in a cross-sectional view perpendicular to the longitudinal axis L. Figure 12b In the figure, the area above the upper tie area 49 (in the plane of the figure), shown in cross-section (perpendicular to the longitudinal axis), is the interior of the base, marked with reference numeral 3, while the area below the upper tie area 49 shown in cross-section is the exterior of the container. Reference numeral 5 indicates the external space.

[0178] Figure 48 indicates, as Figure 11 The upper transition region 48 of the tether or groove bottom 33. Preferably, the upper transition region 48 of the tether or groove bottom 33 is designed as a compensation region between regions (here, between the upper tether region 49 and the central tether region 45 or the main tether region 45 in the longitudinal direction), particularly as a free-form region.

[0179] Reference numerals 44 and 45 denote the central frenulum region or main frenulum region as viewed in the longitudinal direction L of the frenulum, which is preferably located between the upper transition region 48 and the lower transition region 47. Preferably, the lower transition region 47 is positioned as a transition between (adjacent) regions, particularly between the main frenulum regions 44, 45 and the lower frenulum region 46. The lower frenulum region 46 preferably represents the inlet of the bottom center and / or injection point 18. Preferably, the lower frenulum region 46 has no curvature in its (preferably any) cross-section (particularly perpendicular to the longitudinal direction L). Preferably, the lower frenulum region 46 is substantially flat or planar.

[0180] Preferably, the lower transition region 47 is designed as a free-form transition section.

[0181] Reference numeral 44 indicates the central frenulum region (viewed in the circumferential direction U) (here, the main frenulum region or the central frenulum region viewed in the longitudinal direction). This central frenulum region 44 (viewed in the circumferential direction U) is situated between two lateral frenulum regions, also referred to as the "flanks" of the frenulum, and is denoted by reference numerals 32 and 36.

[0182] Figure 12c This explains that the central frenulum region 44 (“central frenulum region – center”) (viewed in the circumferential direction U) always curves inward in cross-section (perpendicular to the longitudinal axis), particularly in the central frenulum region or the primary frenulum region 45 viewed in the longitudinal direction L. (Compared to) Figure 12b Similarly, in Figure 12c In the middle, the area above the upper frenulum region 44 shown in the cross-section (cross-section perpendicular to the longitudinal axis) Figure 12c The area shown in the attached drawing (within the plane) is the bottom interior (marked by reference numeral 3), while the area below the upper tie region 49 shown in the cross-section is the exterior of the container. Reference numeral 5 indicates the external space.

[0183] exist Figure 12a In the figure, two reference numerals 45 respectively denote the groove bottom 33 (viewed in the longitudinal direction) of the so-called "flanks" or central tether region of the tether. These two reference numerals 45 specifically denote the two lateral tether regions 32 and 36 of the main tether region 45 and the central tether region viewed in the longitudinal direction L.

[0184] Each “flank” 45 of the central frenulum region (viewed in the longitudinal direction) or main frenulum region 45 is preferably curved inward, but may also be curved outward or straight. Figure 12d This is illustrated by showing three different tether cross-sections (cross-sections perpendicular to the longitudinal direction L). Viewed in the longitudinal direction L, the middle portions of the three tether regions shown are preferably curved inwards through the central tether region or the main tether region 45, but they may also curve outwards or be linear. The middle portion of each of the three tether cross-sections in the figure shows the central tether region 44 (viewed in the circumferential direction U), and the two outer portions each show the "flanks" 45 or the lateral tether regions 32 and 36 of the main tether region 45.

[0185] Figure 12d The figure above illustrates a preferred embodiment in which the lateral lacing regions 32, 36 of the main lacing region 45 are curved inward in cross-section (i.e., in a cross-section perpendicular to the longitudinal axis L). In this embodiment, the central lacing region 44 (viewed in the circumferential direction U) and the two lateral "flank" lacing regions 45 are both curved inward.

[0186] With Figure 12b Like c, also in Figure 12dIn the middle, the areas above the fretting regions 44 and 45 are shown in cross-section (a cross-section perpendicular to the longitudinal axis). Figure 12d The area shown in the attached diagram (within the plane) is the bottom interior, while the area below the tying areas 44 and 45, shown in cross-section, is the container exterior.

[0187] Figure 12d The intermediate figure illustrates another preferred embodiment, wherein the lateral tether regions 32, 36 of the main tether region 45 are curved outward in cross-section (i.e., in a cross-section perpendicular to the longitudinal axis L). In this embodiment, the curvature of the container wall region of the central tether portion 44 (viewed from the circumferential direction U) is opposite to the inward curvature of the two lateral "flank" tether regions 45 (both curving outward).

[0188] The image below Figure 12d Another alternative preferred embodiment is shown, in which the lateral tether regions 32, 36 of the main tether region 45 have no curvature in cross-section (i.e., in the cross-section perpendicular to the longitudinal axis L), but are linearly designed. In this embodiment, opposite to the (inward) curvature (viewed from the circumferential direction U) of the container wall region of the central tether portion 44, the respective lateral "flank" tether regions 45 are therefore not curved (but run linearly or in a straight line).

[0189] The applicant reserves the right to claim all features disclosed in the application documents as essential features of the utility model, provided that these features, individually or in combination, are novel compared to the prior art. Furthermore, it should be noted that features that may be advantageous in themselves are also described in individual figures. Those skilled in the art will readily recognize that a particular feature described in the figure may be advantageous, even without employing other features in that figure. Additionally, those skilled in the art will recognize that advantages can also be derived by combining several features shown in a single figure or different figures.

[0190] List of icon numbers

[0191] 1. Plastic container

[0192] 2. Bottom area

[0193] 3. Bottom interior

[0194] 4. Matrix

[0195] 5. External

[0196] 6. Opening area

[0197] 8 container mouth

[0198] 18 injection sites

[0199] 19. Geometric center of the bottom wall (or bottom area)

[0200] 21 Foot flank surface

[0201] 22. Standing feet

[0202] 24. Upright area / upright part

[0203] 30 grooves

[0204] 32 Lateral frenulum area

[0205] 33. Bottom of the tank

[0206] 35 Arrow pointing to the central frenulum area

[0207] 36 Lateral fretting area

[0208] 40. Cross-sectional profile of the bottom of the trench

[0209] 42. Cross-sectional profile of the trench bottom

[0210] 44. Central frenulum area

[0211] 45 Main Filament Area

[0212] 46 Lower frenulum area

[0213] 47 Lower Transition Region

[0214] 48 Upper transition area

[0215] 49 Upper frenulum area

[0216] 50 matrix

[0217] BQ bottom area boundary line

[0218] L (vertical direction)

[0219] M Central axis

[0220] K circumference

[0221] S1–S5 Partial Boundaries

Claims

1. A plastic container (1) having a bottom region (2), a base (50) connected to the bottom region (2) in a longitudinal direction (L) of the plastic container (1), and an opening region (6) at least indirectly connected to the base (50) in the longitudinal direction (L), the opening region having a container mouth (8), wherein the bottom region (2) has at least three upright legs (22), wherein at least one groove (30) is provided between two upright legs (22), the groove having a groove bottom (33) extending a circumferential angle in a circumferential direction (U), wherein the groove bottom (33) serves as a strap, wherein the container is integrally formed. Its features are, The bottom of the trough (33) has a central lacing region (44), the wall of the container is curved inward in the central lacing region, the central lacing region is disposed between two lateral lacing regions (32, 36) in the circumferential direction (U), wherein in a cross section perpendicular to the longitudinal direction (L), the bottom of the trough (33) is formed in the central lacing region according to a first curvature feature, and in the two lateral lacing regions (32, 36) according to a second curvature feature different from the first curvature feature, wherein the ratio of the curvature of the bottom of the trough in the central lacing region to the curvature of the bottom of the lateral lacing regions is greater than 2.

2. The plastic container (1) according to claim 1, Its features are, The central lacing region (44) extends at least partially along the geometric center (34) of the bottom of the groove (33).

3. The plastic container (1) according to claim 1, Its features are, The groove bottom in the cross-section perpendicular to the longitudinal direction of the central lacing region has at least a greater curvature than the groove bottoms of the two lateral lacing regions.

4. The plastic container (1) according to claim 3, Its features are, The ratio of the bottom curvature of the central lacing region to the bottom curvature of the lateral lacing region is greater than 2.

5. The plastic container (1) according to claim 1, Its features are, The bottom of the trough (33) has at least one first turning region and one second turning region, in which the surface area of ​​the bottom of the trough changes the direction of its curvature.

6. The plastic container (1) according to claim 1, Its features are, The straps are part of the free-form bottom.

7. The plastic container (1) according to claim 1, Its features are, At least one groove bottom (33) has a circumferential angle between 0.5° and 30°.

8. The plastic container (1) according to claim 1, Its features are, The circumferential angle of the central frenulum region (44) extends between 0.1° and 10°.

9. The plastic container (1) according to claim 8, Its features are, The ratio of the circumference of the central frenulum region to the circumference of the two lateral frenulum regions is between 1:0.1 and 1:

40.

10. The plastic container (1) according to claim 1, Its features are, The bottom of the trough (33) is substantially symmetrical with respect to the geometric center (34) of the bottom of the trough.

11. The plastic container (1) according to claim 1, Its features are, The area located at the bottom portion between the upright foot (22) and the bottom of the groove (33) passes through the bottom of the groove (33) in a manner that is tangentially continuous and / or curvature continuous.

12. The plastic container (1) according to claim 1, Its features are, The cross-sectional profile (35) of the tank bottom follows at least partially an nth-order spline on the cross-section perpendicular to the longitudinal direction (L) of the container.

13. The plastic container (1) according to claim 12, Its features are, A portion of the groove bottom (33) that can be described by the spline passes through a portion of the upright foot side connected to the spline in a manner that is tangentially continuous and / or curvature continuous.

14. A blow molding apparatus for manufacturing a plastic container (1), having an inner wall to which the plastic container (1) is capable of expanding during the blow molding process. Its features are, The inner wall has a profile that is adapted and defined for manufacturing the plastic container (1) according to claim 1.

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