EP2855289B1 - Container having a bottom provided with a stepped arch - Google Patents
Container having a bottom provided with a stepped arch Download PDFInfo
- Publication number
- EP2855289B1 EP2855289B1 EP13727293.6A EP13727293A EP2855289B1 EP 2855289 B1 EP2855289 B1 EP 2855289B1 EP 13727293 A EP13727293 A EP 13727293A EP 2855289 B1 EP2855289 B1 EP 2855289B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- seat
- diameter
- height
- extends
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 238000007664 blowing Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 5
- 239000005020 polyethylene terephthalate Substances 0.000 description 5
- 238000000071 blow moulding Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000036561 sun exposure Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/0261—Bottom construction
- B65D1/0284—Bottom construction having a discontinuous contact surface, e.g. discrete feet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/40—Details of walls
- B65D1/42—Reinforcing or strengthening parts or members
- B65D1/46—Local reinforcements, e.g. adjacent closures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2501/00—Containers having bodies formed in one piece
- B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
- B65D2501/0018—Ribs
- B65D2501/0036—Hollow circonferential ribs
Definitions
- the invention relates to the manufacture of containers, especially bottles or jars, obtained by blow molding or stretch blow molding from plastic preforms, such as polyethylene terephthalate (PET).
- plastic preforms such as polyethylene terephthalate (PET).
- the manufacture by blowing of a container usually consists in introducing into a mold to the imprint of the container a blank (a preform or an intermediate container obtained by pre-blowing a preform) previously heated to a temperature above the glass transition temperature of the material, and to inject into the blank a fluid (in particular a gas such as air) under pressure.
- a fluid in particular a gas such as air
- the blowing can be completed by preliminary stretching of the blank by means of a sliding rod.
- the double molecular orientation that the material undergoes during blowing gives the container a certain structural rigidity.
- a well-known method of increasing the stiffness of a container is heat-setting, which involves heating the mold wall to thermally increase the crystallinity level.
- This process illustrated by the French patent FR 2 649 035 (Sidel ) and its American counterpart US5,145,632 , is used in particular for HR applications (initials of the term "heat resistant” or heat resistant), in which the container is filled hot.
- EP 2 133 277 A1 shows, as prior art, a container equipped with a reinforced bottom which has grooves extending radially from a central vaulted area to an annular seating area. A fold separates said central zone from another vaulted portion of said bottom. This fold ends at the edges of said grooves, and therefore does not extend in their bottom.
- the container when the container is stored in high heat, typically when stored in a pallet outdoors in full sun, the temperature of the contents may reach or exceed 50 ° C, and the pressure increase induced by the expansion of the contents exceed the threshold beyond which the bottom turns. The container then becomes unstable, with a high risk of collapse of the entire pallet. Similarly, when the container is stored in the freezer at temperatures at which the content freezes, the expansion induced by solidification causes a reversal of the bottom, the container also becoming unstable.
- a first objective is to improve the mechanical performance of the blowing containers (i.e. capacity of the container to be formed by blowing) equivalent.
- a second objective is to propose a container whose optimized bottom shape gives it a good compromise between breathability, lightness and rigidity.
- a third objective is to provide a container whose bottom offers good resistance to overturning, and which, under extreme conditions of pressure and / or internal volume, can remain stable.
- a plastic container provided with a body and a bottom extending from a lower end of the body, the bottom comprising a peripheral base defining a laying plane, a concave arch which extends from a central zone to the seat and a series of reinforcing grooves which extend radially from the central zone to at least the seat, a vessel in which the vault has two concentric regions, namely a central region and a peripheral region, separated by a median axial recess which extends annularly continuously around the central zone so that the central region is elevated in relation to the peripheral region.
- the bottom guarantees the stability of the container even under extreme pressure and / or volume conditions.
- a container 1 in this case a bottle, made by stretch blow molding from a thermoplastic preform, for example PET (polyethylene terephthalate).
- a thermoplastic preform for example PET (polyethylene terephthalate).
- This container 1 comprises, at an upper end, a neck 2, provided with a rim 3.
- the container 1 comprises in its upper part a shoulder 4 flaring in the opposite direction to the neck 2, this shoulder 4 being extended by a side wall or body 5, of generally cylindrical shape of revolution about a main axis X of the container 1.
- the container 1 further comprises a bottom 6 which extends opposite the neck 2, from a lower end of the body 5.
- the bottom 6 comprises a peripheral seat 7 in the form of an annular bead which extends substantially axially in the extension of the body 5.
- the seat 7 terminates in a laying plane 8 perpendicular to the axis X of the container 1, which laying plane 8 defines the lower end of the container 1 and allows it to stand on a flat surface
- the seat 7 Towards the interior of the container 1, the seat 7 comprises a frustoconical annular cheek 9 which extends towards the interior of the container 1 in the extension of the laying plane 8 , the truncated cone formed by the cheek 9 opening downward (in relief) and having an apex angle of at least 70 °.
- This cheek 9 may have a height of between 1 mm and 3 mm, for example about 1.5 mm.
- the bottom 6 further comprises a concave arch 10 , in the form of a substantially spherical cap with concavity turned towards the outside of the container 1 in the absence of stress, that is to say in the absence of content in the container 1.
- the arch 10 extends from the seat 7, in the extension of the cheek 9, to a central zone 11 of the bottom 6 forming a pin projecting towards the inside the container 1, with at its center an amorphous pellet 12 which corresponds to the injection zone of the constituent material of the preform used to make the container and can fulfill a centering function during the blow molding of the container 1 .
- the bottom 6 comprises a series of main reinforcing grooves 13 formed recessed towards the inside of the container 1, which extend radially from the central zone 11 , to the seat 7 at least.
- the main reinforcing grooves 13 extend radially beyond the seat 7, rising laterally on a lower part of the body 5.
- the main grooves 13 extend radially over the entire roof 10, straddling the seat 7 and partially on the body 5. It is therefore understood that the laying plane 8 is discontinuous, since interrupted at the right of each main groove 13 .
- the main grooves 13 are for example five in number (as in the example illustrated, which corresponds to a container with a capacity of 0.5 liter), but this number could be higher, especially six in the case of a container with a capacity greater than or equal to 1 liter, or seven in the case of a container with a capacity greater than or equal to 2.5 liters.
- the bottom 6 is further provided with a series of interleaving reinforcement grooves 14 , located between the main grooves 13 , and which extend locally astride the seat 7, which they thus contribute. to stiffen.
- the intermediate ribs 14 extend outwardly beyond the seat 7 upwards laterally on a lower part of the body 5, as the main grooves 13 .
- the intermediate ribs 14 overlap the cheek 9 but are interrupted at the periphery of the vault 10.
- the vault 10 has two concentric parts, namely a central area 15 surrounding the central annular zone 11 of the bottom 6, and an annular peripheral region 16 surrounding the central region 15, separated by a shoulder 17 which extends axially over a predetermined height H.
- This offset 17 is median with respect to the arch 10, that is to say that the central region 15 and peripheral region 16 have substantially the same radial extension.
- this recess 17 extends continuously, that is to say, it is not interrupted to the right of the main grooves 13 but extends to the bottom thereof.
- the axial recess 17 extends annularly around the central zone 11 .
- the recess 17 forms a ring with a circular contour whose diameter D2 is noted.
- the recess 17 also has a polygonal contour, homothetic to the outer contour of the container 1. D2 then denotes the diameter of the circle in which the polygonal contour would be inscribed. of the detachment.
- the central region 15 although having a radius of curvature substantially identical to that of the peripheral region 16, is slightly raised relative thereto, being offset towards the interior of the container 1.
- the diameter D2 of the recess 17 is between 40% and 60% of the diameter D1 of the laying plane 8 .
- the ratio D2 / D1 is about 50%.
- the height H of the recess 17 is substantially constant on its contour, being advantageously between 0.4 mm and 1.2 mm.
- this height H is rather between 0.4 mm and 0.7 mm, and for example about 0.5 mm .
- the height H of the recess 17 is rather between 0.7 and 1.2 mm, and for example about 1 mm.
- the recess 17 serves to maintain the stability of the container 1 under extreme pressure and / or volume conditions, particularly when there is a pressure in the container 1 caused by expansion of the contents and the volume under the neck, caused by example to an exposure of container 1 (full) to the sun, or when the contents undergoes a dilation induced by its solidification, due for example to the storage of the container 1 (full) in the freezer.
- the content exerts on the bottom 6 a pressure that tends to collapse.
- the recess 17 opposes, however, the complete reversal of the bottom 6 by inducing a stiffening of the vault 10 in its central region, and limiting the deformation of the vault 10 so as to widen the seat 7 (as suggested by the dotted lines on the figure 5 ) Toward the bottom center 6.
- the bottom 6 but actually undergoes a reversal in a controlled manner, the central region 15 of the arch 10, so forming a secondary seat by which the container 1 can rest stably on a support surface .
- the diameter D2 of the recess 17 is too small (typically less than 40% of the diameter D1 of the plane 8 setting), the surface of the secondary seat formed by the central region 15 returned would be too low and the container would be unstable. If instead the diameter D2 of the recess 17 was too large (typically greater than 60% of the diameter D1 of the plane 8 setting), the risk of rollover of the bottom 6 is increased, the deformation of the 10 less well controlled arch, and resulting in instability of the container.
- An axial (ie cylindrical) recess 17 extending over a relatively low height H offers a good compromise between the control of the deformation of the bottom 6 as just described, and a good blowing ability. from the bottom 6.
- a container 1 of PET corresponding to the illustrated form with a capacity of 0.5 liter, a mass of 10 g, could be easily blown at an air pressure of 19 bar, the container 1 final filled with plain water with good mechanical performance in the above extreme conditions (sun exposure at 50 ° C and freezing at -18 ° C): the deformation of the base 6 remains controlled, the central region 15 of the arch 10 forming a secondary seat allowing the container 1 resting on a horizontal surface to maintain good stability.
- the container 1 provided with this bottom 6 has a good compromise between the mechanical performance (that is to say the capacity of the container 1 to resist deformations and, when they occur, to undergo them in a controlled manner) and the blowing (that is to say the capacity of the container 1 to be formed by blowing).
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
L'invention a trait à la fabrication des récipients, notamment bouteilles ou pots, obtenus par soufflage ou étirage soufflage à partir de préformes en matière plastique, telle que du polyéthylène téréphtalate (PET).The invention relates to the manufacture of containers, especially bottles or jars, obtained by blow molding or stretch blow molding from plastic preforms, such as polyethylene terephthalate (PET).
La fabrication par soufflage d'un récipient consiste ordinairement à introduire dans un moule à l'empreinte du récipient une ébauche (une préforme ou un récipient intermédiaire obtenu par présoufflage d'une préforme) préalablement chauffée à une température supérieure à la température de transition vitreuse de la matière, et à injecter dans l'ébauche un fluide (notamment un gaz tel que de l'air) sous pression. Le soufflage peut être complété par un étirage préalable de l'ébauche au moyen d'une tige coulissante.The manufacture by blowing of a container usually consists in introducing into a mold to the imprint of the container a blank (a preform or an intermediate container obtained by pre-blowing a preform) previously heated to a temperature above the glass transition temperature of the material, and to inject into the blank a fluid (in particular a gas such as air) under pressure. The blowing can be completed by preliminary stretching of the blank by means of a sliding rod.
La double orientation moléculaire que subit la matière au cours du soufflage (axiale et radiale, respectivement parallèlement et perpendiculairement à l'axe général du récipient) confère au récipient une certaine rigidité structurelle.The double molecular orientation that the material undergoes during blowing (axial and radial, respectively parallel and perpendicular to the general axis of the container) gives the container a certain structural rigidity.
Mais la diminution - dictée par le marché - de la quantité de matière employée pour la fabrication des récipients amène les fabricants à recourir à des astuces de fabrication ou de forme pour rigidifier leurs récipients, la bi-orientation se révélant insuffisante. Il en résulte qu'à poids égal deux récipients n'ont pas nécessairement les mêmes performances mécaniques (tenue, rigidité).But the decrease - dictated by the market - of the amount of material used for the manufacture of containers leads manufacturers to use manufacturing tips or form to stiffen their containers, the bi-orientation being insufficient. As a result, with equal weight, two containers do not necessarily have the same mechanical performance (strength, rigidity).
Un procédé bien connu d'accroissement de la rigidité d'un récipient est la thermofixation, qui consiste à chauffer la paroi du moule pour augmenter par voie thermique le taux de cristallinité. Ce procédé, illustré par le brevet français
Mais, en raison de son coût et de la réduction de cadence qu'il impose, ce type de procédé ne saurait se généraliser aux applications ordinaires du type eau plate. Pour ces applications, la rigidité structurelle du fond dépend essentiellement de sa forme. Il est connu de rigidifier le fond au moyen de rainures radiales, cf. par ex. le brevet français
Il serait en théorie possible de former sur le fond de profondes réserves en creux (notamment une voûte profonde) susceptibles d'accroître la résistance mécanique du fond. Cependant, cette astuce de forme, aussi efficace soit-elle, nécessite à la fois un surcroît de matière, incompatible avec les exigences d'allègement précitées, et une pression de soufflage élevée, incompatible avec les exigences d'économie d'énergie, qui supposent au contraire une diminution de la pression de soufflage nécessaire au formage du récipient. A titre d'exemple, les cahiers des charges actuels pour le formage de bouteilles d'eau plate de capacité 0,5 litre imposent ordinairement une masse de l'ordre de 10 g, pour une pression de soufflage de l'ordre de 20 bar.It would be theoretically possible to form deep caverns on the bottom (in particular a deep vault) likely to increase the mechanical strength of the bottom. However, this trick of form, as effective as it is, requires both an additional material, incompatible with the aforementioned lightening requirements, and a high blowing pressure, incompatible with the energy saving requirements, which on the contrary, suppose a decrease in the blowing pressure necessary for forming the container. By way of example, the current specifications for forming flat water bottles with a capacity of 0.5 liters usually require a mass of the order of 10 g, for a blowing pressure of the order of 20 bar. .
Un premier objectif est d'améliorer les performances mécaniques des récipients à soufflabilité (c'est-à-dire capacité du récipient à être formé par soufflage) équivalente.A first objective is to improve the mechanical performance of the blowing containers (i.e. capacity of the container to be formed by blowing) equivalent.
Un deuxième objectif est de proposer un récipient dont la forme optimisée du fond lui confère un bon compromis entre soufflabilité, légèreté et rigidité.A second objective is to propose a container whose optimized bottom shape gives it a good compromise between breathability, lightness and rigidity.
Un troisième objectif est de proposer un récipient dont le fond offre une bonne résistance au retournement, et qui, dans des conditions extrêmes de pression et/ou de volume interne, puisse demeurer stable.A third objective is to provide a container whose bottom offers good resistance to overturning, and which, under extreme conditions of pressure and / or internal volume, can remain stable.
A cet effet, il est proposé un récipient en matière plastique, muni d'un corps et d'un fond s'étendant à partir d'une extrémité inférieure du corps, le fond comprenant une assise périphérique définissant un plan de pose, une voûte concave qui s'étend à partir d'une zone centrale jusqu'à l'assise et une série de rainures de renfort qui s'étendent radialement à partir de la zone centrale jusqu'à l'assise au moins, récipient dans lequel la voûte présente deux régions concentriques, à savoir une région centrale et une région périphérique, séparées par un décrochement axial médian qui s'étend annulairement de manière continue autour de la zone centrale, en sorte que la région centrale se trouve surélevée par rapport à la région périphérique.For this purpose, it is proposed a plastic container, provided with a body and a bottom extending from a lower end of the body, the bottom comprising a peripheral base defining a laying plane, a concave arch which extends from a central zone to the seat and a series of reinforcing grooves which extend radially from the central zone to at least the seat, a vessel in which the vault has two concentric regions, namely a central region and a peripheral region, separated by a median axial recess which extends annularly continuously around the central zone so that the central region is elevated in relation to the peripheral region.
Grâce à ce décrochement, le fond garantit la stabilité du récipient même dans des conditions de pression et/ou de volume extrêmes.Thanks to this recess, the bottom guarantees the stability of the container even under extreme pressure and / or volume conditions.
Diverses caractéristiques supplémentaires peuvent être prévues, seules ou en combinaison :
- le décrochement présente un diamètre compris entre 40% et 60% d'un diamètre du plan de pose ;
- le diamètre du décrochement est d'environ 50% du diamètre du plan de pose ;
- les rainures se prolongent radialement au-delà de l'assise ;
- le fond comprend une série de rainures intercalaires de renfort, qui s'étendent localement à cheval sur l'assise ;
- le décrochement s'étend sur une hauteur comprise entre 0,4 et 1,2 mm ;
- le récipient présente une capacité de 0,5 litre et le décrochement s'étend sur une hauteur comprise entre 0,4 et 1,2 mm, notamment d'environ 0,5 mm ;
- le récipient présente une capacité de 1,5 litre et le décrochement s'étend sur une hauteur comprise entre 0,7 et 1,2 mm, notamment d'environ 1 mm.
- the recess has a diameter of between 40% and 60% of a diameter of the laying plane;
- the diameter of the recess is about 50% of the diameter of the laying plane;
- the grooves extend radially beyond the seat;
- the bottom comprises a series of reinforcement intermediate grooves, which extend locally astride the seat;
- the recess extends over a height of between 0.4 and 1.2 mm;
- the container has a capacity of 0.5 liter and the recess extends over a height of between 0.4 and 1.2 mm, in particular about 0.5 mm;
- the container has a capacity of 1.5 liters and the recess extends over a height of between 0.7 and 1.2 mm, in particular about 1 mm.
D'autres objets et avantages de l'invention apparaîtront à la lumière de la description d'un mode de réalisation, faite ci-après en référence aux dessins annexés dans lesquels :
- la
figure 1 est une vue de dessous en perspective d'un récipient en matière plastique ; - la
figure 2 est une vue en perspective, à échelle agrandie, montrant le fond du récipient de lafigure 1 ; - la
figure 3 est une vue en plan de dessous du récipient ; - la
figure 4 est une vue en coupe centrale, en perspective, du récipient de lafigure 3 ; - la
figure 5 est une vue en coupe centrale du récipient de lafigure 3 .
- the
figure 1 is a perspective bottom view of a plastic container; - the
figure 2 is a perspective view, on an enlarged scale, showing the bottom of the container of thefigure 1 ; - the
figure 3 is a plan view from below of the container; - the
figure 4 is a central sectional view, in perspective, of the container of thefigure 3 ; - the
figure 5 is a central sectional view of the container of thefigure 3 .
Sur la
Ce récipient 1 comprend, à une extrémité supérieure, un col 2, muni d'un buvant 3. Dans le prolongement du col 2, le récipient 1 comprend dans sa partie supérieure une épaule 4 allant en s'évasant dans la direction opposée au col 2, cette épaule 4 étant prolongée par une paroi latérale ou corps 5, de forme généralement cylindrique de révolution autour d'un axe X principal du récipient 1. This
Le récipient 1 comprend en outre un fond 6 qui s'étend à l'opposé du col 2, à partir d'une extrémité inférieure du corps 5. Le fond 6 comprend une assise 7 périphérique sous forme d'un bourrelet annulaire qui s'étend sensiblement axialement dans le prolongement du corps 5. L'assise 7 se termine par un plan 8 de pose perpendiculaire à l'axe X du récipient 1, lequel plan 8 de pose définit l'extrémité inférieure du récipient 1 et lui permet d'être posé, debout, sur une surface plane.The
On note D1 le diamètre du plan 8 de pose, le terme « diamètre » couvrant non seulement le cas (illustré) où le récipient 1 (et donc le fond 6) est à contour circulaire, mais également le cas où le récipient 1 serait à contour polygonal (par exemple carré), auquel cas le terme « diamètre » désignerait le diamètre du cercle dans lequel s'inscrirait ce polygone.Note D1 the diameter of the
Vers l'intérieur du récipient 1, l'assise 7 comprend une joue 9 annulaire tronconique qui s'étend vers l'intérieur du récipient 1 dans le prolongement du plan 8 de pose, le tronc de cône formé par la joue 9 s'ouvrant vers le bas (en dépouille) et présentant un angle au sommet d'au moins 70°. Cette joue 9 peut présenter une hauteur comprise entre 1 mm et 3 mm, par exemple d'environ 1,5 mm.Towards the interior of the
Le fond 6 comprend en outre une voûte 10 concave, sous forme d'une calotte sensiblement sphérique à concavité tournée vers l'extérieur du récipient 1 en l'absence de contrainte, c'est-à-dire en l'absence de contenu dans le récipient 1. La voûte 10 s'étend à partir de l'assise 7, dans le prolongement de la joue 9, jusqu'à une zone 11 centrale du fond 6 formant un pion en saillie vers l'intérieur du récipient 1, avec en son centre une pastille 12 amorphe qui correspond à la zone d'injection du matériau constitutif de la préforme ayant servi à réaliser le récipient et peut remplir une fonction de centrage lors du formage, par soufflage, du récipient 1. The
Comme cela est visible sur les figures, et en particulier sur la
En d'autres termes, les rainures 13 principales s'étendent radialement sur la totalité de la voûte 10, à cheval sur l'assise 7 et partiellement sur le corps 5. On comprend par conséquent que le plan 8 de pose est discontinu, puisqu'interrompu au droit de chaque rainure 13 principale. Les rainures 13 principales sont par exemple au nombre de cinq (comme dans l'exemple illustré, qui correspond à un récipient d'une capacité de 0,5 litre), mais ce nombre pourrait être supérieur, notamment de six dans le cas d'un récipient d'une capacité supérieure ou égale à 1 litre, ou encore de sept dans le cas d'un récipient d'une capacité supérieure ou égale à 2,5 litre.In other words, the
Selon un mode préféré de réalisation, le fond 6 est en outre pourvu d'une série de rainures 14 intercalaires de renfort, situées entre les rainures 13 principales, et qui s'étendent localement à cheval sur l'assise 7 qu'elles contribuent ainsi à rigidifier. Ainsi que représenté sur les
Comme on le voit sur les figures, et plus nettement sur les
Selon l'invention, ce décrochement 17 s'étend de manière continue, c'est-à-dire qu'il n'est pas interrompu au droit des rainures 13 principales mais s'étend jusqu'au fond de celles-ci.According to the invention, this
Le décrochement 17 axial s'étend annulairement autour de la zone 11 centrale. Dans le mode de réalisation représenté, où le récipient 1 est de forme sensiblement cylindrique de révolution autour de son axe X, le décrochement 17 forme un anneau à contour circulaire dont on note D2 le diamètre. Dans des variantes déjà évoquées, où le récipient 1 présenterait en section transversale un contour polygonal, le décrochement 17 présenterait également un contour polygonal, homothétique au contour extérieur du récipient 1. D2 désignerait alors le diamètre du cercle dans lequel s'inscrirait le contour polygonal du décrochement.The
Par la présence du décrochement 17 axial, la région 15 centrale, bien qu'ayant un rayon de courbure sensiblement identique à celui de la région 16 périphérique, se trouve légèrement surélevée par rapport celle-ci, en étant décalée vers l'intérieur du récipient 1. By the presence of the axial offset 17, the
Selon un mode de réalisation, le diamètre D2 du décrochement 17 est compris entre 40% et 60% du diamètre D1 du plan 8 de pose. Dans l'exemple illustré, le rapport D2/D1 est d'environ 50%.According to one embodiment, the diameter D2 of the
Quant à la hauteur H du décrochement 17, elle est sensiblement constante sur son contour, en étant avantageusement comprise entre 0,4 mm et 1,2 mm. Pour un récipient d'une capacité de 0,5 litre (ce qui correspond à l'exemple illustré), cette hauteur H est plutôt comprise entre 0,4 mm et 0,7 mm, et par exemple d'environ 0,5 mm. Pour un récipient d'une capacité de 1,5 litre ; la hauteur H du décrochement 17 est plutôt comprise entre 0,7 et 1,2 mm, et par exemple d'environ 1 mm.As for the height H of the
Le décrochement 17 a pour fonction de maintenir la stabilité du récipient 1 dans des conditions de pression et/ou de volume extrêmes, notamment lorsqu'il règne dans le récipient 1 une surpression induite par une dilatation du contenu et du volume sous col, due par exemple à une exposition du récipient 1 (plein) au soleil, ou lorsque le contenu subit une dilatation induite par sa solidification, due par exemple au stockage du récipient 1 (plein) en congélateur.The
Dans ces conditions, le contenu exerce sur le fond 6 une pression qui tend à l'affaisser. Le décrochement 17 s'oppose toutefois au retournement complet du fond 6 en induisant une rigidification de la voûte 10 dans sa région médiane, et en limitant la déformation de la voûte 10 de sorte à élargir l'assise 7 (comme suggéré par les pointillés sur la
Si le diamètre D2 du décrochement 17 était trop faible (typiquement inférieur à 40% du diamètre D1 du plan 8 de pose), la surface de l'assise secondaire formée par la région 15 centrale retournée serait trop faible et le récipient serait instable. Si au contraire le diamètre D2 du décrochement 17 était trop important (typiquement supérieur à 60% du diamètre D1 du plan de 8 pose), le risque de retournement du fond 6 serait accru, la déformation de la voûte 10 moins bien contrôlée, et il en résulterait une instabilité du récipient.If the diameter D2 of the
Un décrochement 17 axial (c'est-à-dire cylindrique) s'étendant sur une hauteur H relativement faible offre un bon compromis entre le contrôle de la déformation du fond 6 telle qu'elle vient d'être décrite, et une bonne soufflabilité du fond 6. An axial (ie cylindrical)
Ainsi, un récipient 1 en PET correspondant à la forme illustrée, d'une capacité de 0,5 litre, d'une masse de 10 g, a pu être soufflé sans difficulté à une pression d'air de 19 bars, le récipient 1 final rempli d'eau plate offrant de bonnes performances mécaniques dans les conditions extrêmes précitées (exposition au soleil à 50°C et congélation à -18°C) : la déformation du fond 6 demeure contrôlée, la région 15 centrale de la voûte 10 formant une assise secondaire permettant au récipient 1 reposant sur une surface horizontale de conserver une bonne stabilité.Thus, a
Une augmentation de la hauteur H du décrochement 17 pourrait accroître la rigidité du fond 6, mais induirait parallèlement une diminution de sa soufflabilité au niveau du décrochement 17, sauf à donner à celui-ci de la dépouille, ce qui diminuerait alors la rigidité du fond 6. An increase in the height H of the
Le récipient 1 muni de ce fond 6 présente un bon compromis entre les performances mécaniques (c'est-à-dire la capacité du récipient 1 à résister aux déformations et, lorsque celles-ci surviennent, à les subir de manière contrôlée) et la soufflabilité (c'est-à-dire la capacité du récipient 1 à être formé par soufflage).The
Claims (10)
- Container (1) made of plastic and provided with a body (5) and with a bottom (6) extending from a lower end of the body (5), the bottom (6) comprising:- a peripheral seat (7) defining a seating plane (8) ;- a concave arch (10) which extends from a central zone (11) to the seat (7);- a series of main reinforcing grooves (13) which extend radially from the central zone (11) to at least the seat (7),characterized in that the arch (10) has two concentric regions, namely a central region (15) and a peripheral region (16) separated by a median axial step (17) which extends annularly in a continuous manner around the central zone (11), that is to say that the said step is not interrupted perpendicular to the main grooves (13) but extends to the bottom thereof, with the result that the central region (15) is raised with respect to the peripheral region (16).
- Container (1) according to Claim 1, characterized in that the step (17) has a diameter (D2) of between 40% and 60% of a diameter (D1) of the seating plane (8).
- Container (1) according to Claim 2, characterized in that the diameter of the step (17) is about 50% of the diameter of the seating plane (8).
- Container (1) according to one of the preceding claims, characterized in that the main reinforcing grooves (13) extend radially beyond the seat (7).
- Container (1) according to one of the preceding claims, characterized in that the bottom (6) comprises a series of intermediate reinforcing grooves (14) which extend locally astride the seat (7).
- Container (1) according to one of the preceding claims, characterized in that the step (17) extends over a height (H) of between 0.4 and 1.2 mm.
- Container (1) according to Claim 6, characterized in that it has a capacity of 0.5 litre and in that the step (17) extends over a height (H) of between 0.4 and 0.7 mm.
- Container (1) according to Claim 7, characterized in that the step (17) extends over a height (H) of about 0.5 mm.
- Container (1) according to Claim 6, characterized in that it has a capacity of 1.5 litres and in that the step (17) extends over a height (H) of between 0.7 and 1.2 mm.
- Container (1) according to Claim 9, characterized in that the step (17) extends over a height (H) of about 1 mm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL13727293T PL2855289T3 (en) | 2012-05-31 | 2013-05-15 | Container having a bottom provided with a stepped arch |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1255049A FR2991302B1 (en) | 2012-05-31 | 2012-05-31 | CONTAINER HAVING A BACKGROUND PROVIDED WITH A DECOUCHEMENT VOUTE |
PCT/FR2013/051057 WO2013178905A1 (en) | 2012-05-31 | 2013-05-15 | Container having a bottom provided with a stepped arch |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2855289A1 EP2855289A1 (en) | 2015-04-08 |
EP2855289B1 true EP2855289B1 (en) | 2016-07-20 |
Family
ID=46785614
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13727293.6A Active EP2855289B1 (en) | 2012-05-31 | 2013-05-15 | Container having a bottom provided with a stepped arch |
Country Status (8)
Country | Link |
---|---|
US (1) | US9415891B2 (en) |
EP (1) | EP2855289B1 (en) |
CN (1) | CN104349983B (en) |
ES (1) | ES2592561T3 (en) |
FR (1) | FR2991302B1 (en) |
MX (1) | MX351595B (en) |
PL (1) | PL2855289T3 (en) |
WO (1) | WO2013178905A1 (en) |
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CH707262A2 (en) * | 2012-11-30 | 2014-05-30 | Alpla Werke | Plastic container. |
JP6648006B2 (en) * | 2014-04-30 | 2020-02-14 | 株式会社吉野工業所 | Synthetic resin bottle |
CN105460340A (en) * | 2016-01-27 | 2016-04-06 | 四川省洛源食品有限公司 | Drink bottle with reinforced bottle head |
USD826059S1 (en) * | 2016-03-25 | 2018-08-21 | Sidel Participations | Bottle |
JP2020523261A (en) * | 2017-06-12 | 2020-08-06 | ソシエテ・デ・プロデュイ・ネスレ・エス・アー | Container bottom base with double concave arch |
MX2019014094A (en) * | 2017-06-16 | 2020-02-07 | Nestle Sa | Container having a bottom base provided with notches. |
WO2019210119A1 (en) * | 2018-04-26 | 2019-10-31 | Graham Packaging Company, L.P. | Pressurized refill container resistant to standing ring cracking |
US10926911B2 (en) * | 2018-10-15 | 2021-02-23 | Pepsico. Inc. | Plastic bottle with base |
JP7454914B2 (en) * | 2019-03-29 | 2024-03-25 | サントリーホールディングス株式会社 | plastic bottle |
JP7413717B2 (en) * | 2019-10-23 | 2024-01-16 | 東洋製罐株式会社 | Synthetic resin container |
JP7370248B2 (en) * | 2019-12-27 | 2023-10-27 | 株式会社吉野工業所 | Bottle |
US20210347102A1 (en) * | 2020-05-08 | 2021-11-11 | Orora Packaging Australia Pty Ltd | Bottle, and an insert and a mould for making the bottle |
FR3120353B1 (en) | 2021-03-02 | 2024-07-05 | Sa Des Eaux Minerales Devian Et En Abrege S A E M E | Improved Bottom Bottle |
US20230166882A1 (en) * | 2021-11-30 | 2023-06-01 | Pepsico, Inc. | Flexible base for aseptic-fill bottles |
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JPS5867719U (en) * | 1981-11-02 | 1983-05-09 | 株式会社吉野工業所 | Bottom of biaxially stretched synthetic resin bottle |
JPH0698979B2 (en) * | 1986-04-22 | 1994-12-07 | 三菱樹脂株式会社 | Stretched synthetic resin bottle |
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FR2919579B1 (en) * | 2007-07-30 | 2011-06-17 | Sidel Participations | CONTAINER COMPRISING A BACKGROUND WITH A DEFORMABLE MEMBRANE. |
FR2932458B1 (en) * | 2008-06-13 | 2010-08-20 | Sidel Participations | CONTAINER, IN PARTICULAR BOTTLE, IN THERMOPLASTIC MATERIAL EQUIPPED WITH A REINFORCED BACKGROUND |
DE102008047450A1 (en) * | 2008-09-15 | 2010-04-15 | Krones Ag | Plastic container |
CN102272007B (en) * | 2008-12-31 | 2014-12-24 | 普拉斯蒂派克包装公司 | Hot-fillable plastic container with flexible base feature |
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FR2961492B1 (en) * | 2010-06-18 | 2012-07-13 | Sidel Participations | LIGHT CONTAINER WITH REINFORCING BACKGROUND |
AT510506B1 (en) * | 2010-09-22 | 2013-01-15 | Red Bull Gmbh | FLOOR CONSTRUCTION FOR A PLASTIC BOTTLE |
DE102010064125A1 (en) * | 2010-12-23 | 2012-06-28 | Krones Aktiengesellschaft | Container made of a thermoplastic material |
-
2012
- 2012-05-31 FR FR1255049A patent/FR2991302B1/en active Active
-
2013
- 2013-05-15 CN CN201380028174.2A patent/CN104349983B/en active Active
- 2013-05-15 PL PL13727293T patent/PL2855289T3/en unknown
- 2013-05-15 MX MX2014014305A patent/MX351595B/en active IP Right Grant
- 2013-05-15 ES ES13727293.6T patent/ES2592561T3/en active Active
- 2013-05-15 US US14/403,667 patent/US9415891B2/en active Active
- 2013-05-15 WO PCT/FR2013/051057 patent/WO2013178905A1/en active Application Filing
- 2013-05-15 EP EP13727293.6A patent/EP2855289B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2013178905A1 (en) | 2013-12-05 |
CN104349983A (en) | 2015-02-11 |
US20150136727A1 (en) | 2015-05-21 |
US9415891B2 (en) | 2016-08-16 |
ES2592561T3 (en) | 2016-11-30 |
MX351595B (en) | 2017-10-20 |
CN104349983B (en) | 2017-08-04 |
EP2855289A1 (en) | 2015-04-08 |
PL2855289T3 (en) | 2017-04-28 |
FR2991302A1 (en) | 2013-12-06 |
FR2991302B1 (en) | 2014-07-04 |
MX2014014305A (en) | 2015-02-12 |
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