EP2785603A1 - Container comprising an arched base having a star-shaped cross-section - Google Patents

Container comprising an arched base having a star-shaped cross-section

Info

Publication number
EP2785603A1
EP2785603A1 EP13719993.1A EP13719993A EP2785603A1 EP 2785603 A1 EP2785603 A1 EP 2785603A1 EP 13719993 A EP13719993 A EP 13719993A EP 2785603 A1 EP2785603 A1 EP 2785603A1
Authority
EP
European Patent Office
Prior art keywords
container
section
ratio
seat
vault
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.)
Granted
Application number
EP13719993.1A
Other languages
German (de)
French (fr)
Other versions
EP2785603B1 (en
Inventor
Michel Boukobza
Laurent Penet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sidel Participations SAS
Original Assignee
Sidel Participations SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sidel Participations SAS filed Critical Sidel Participations SAS
Priority to PL13719993T priority Critical patent/PL2785603T3/en
Publication of EP2785603A1 publication Critical patent/EP2785603A1/en
Application granted granted Critical
Publication of EP2785603B1 publication Critical patent/EP2785603B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B65D1/0276—Bottom construction having a continuous contact surface, e.g. Champagne-type bottom

Definitions

  • Container comprising a vaulted bottom with a star section
  • the invention relates to containers obtained by blow molding or stretching from blanks (preforms or intermediate containers having undergone one or more prior blowing operations) of plastic.
  • the blow-molding of a container comprises a step of introducing, into a mold in the impression of the container, a blank previously heated to a temperature greater than the glass transition temperature of the material constituting the preform (such as than PET), and a step of injection into the blank of a fluid (such as air) under pressure. Stretching by means of a sliding rod can complete the blowing.
  • blowing difficulties (called “blowing” capacity of the container to be formed by blowing, that is to say, the capacity of the material to marry properly the mold cavity) because the thickness of the material makes it difficult to creep into the cavities of the mold corresponding to the ribs.
  • Another solution is to push back the constituent material of the bottom of the container, using for this, inter alia, a special mold equipped with a mold bottom movable in translation which pushes the material (see in particular the European patent EP 1 069 983).
  • the repoussage induces an increase in the rate of deformation of the material and therefore a mechanical increase in its crystallinity, the repoussage phase conferring on the bottom of the container its final shape.
  • boxing does not guarantee that the rigidity of the bottom will be sufficient and does not exonerate the manufacturers to resort to particular forms that remain subject to the constraints of blowing.
  • a plastic container comprising a body extending along a main axis and a bottom in the extension of the body of a lower side thereof, the bottom comprising:
  • a conical arch which extends from a neighborhood of the seat towards the interior of the container to a central summit, this arch having in cross section a star-shaped profile inscribed between two circles whose diameter ratio is greater than or equal to
  • This bottom offers both good structural rigidity and good blowing, while not requiring additional material, to the benefit of the lightness of the container.
  • the ratio of the diameters is between 0.8 and 0.9;
  • the vault comprises a series of facets defining between them obtuse angles in a transverse plane;
  • the angles between facets are greater than or equal to 100 °;
  • the vault has two superimposed portions, namely a substantially conical lower portion at an acute angle, which extends from the vicinity of the seat to an intermediate zone of junction, and a substantially conical upper section with an obtuse angle, which extends from the intermediate junction zone to the summit;
  • the lower portion and the upper portion of the vault have equivalent or substantially equivalent axial extensions
  • the lower portion of the arch has, in axial section, a curved profile concavity facing towards the axis of the container;
  • the upper portion of the arch has, in axial section, a curved profile concavity turned away from the axis of the container. ; in axial section, the profiles of the lower portion and of the upper portion have respective radii of curvature
  • the roof has a height H measured axially and the seat has a width d measured transversely, the H / d ratio of these dimensions being greater than 0.25.
  • Figure 1 is a perspective view from below of a plastic container, according to a first embodiment
  • Figure 2 is a perspective view, on an enlarged scale, of the bottom of the container of Figure 1;
  • Figure 3 is a plan view, from below, of the bottom of Figure 2;
  • FIG. 4 is a section of the bottom of the container of the preceding figures, according to the sectional plane IV-IV of Figure 3;
  • Figure 5 is a section along the sectional plane V-V of Figure 4.
  • Figure 6 is a view similar to Figure 2, illustrating a container bottom according to a second embodiment
  • Figure 7 is a plan view, from below, of the bottom of Figure 6;
  • Figure 8 is a section along the section plane VIII-VIII of Figure 7;
  • Figure 9 is a section along the IX-IX section plane of Figure 8.
  • Figure 10 is a section along the X-X section plane of Figure 8.
  • Figure 1 a container 1 made by stretching blow from a thermoplastic preform such as PET (polyethylene terephthalate).
  • a thermoplastic preform such as PET (polyethylene terephthalate).
  • This container 1 comprises a body 2 of generally cylindrical shape around a main axis X.
  • the body 2 is extended at an upper end by a neck 3 forming a rim and, at a lower end, by a bottom 4.
  • the bottom 4 comprises a seat 5 in the form of an annular bead (in this case O-ring) which extends in the extension of the body 2 and ends axially by a continuous annular face which forms the lower end of the container and defines a laying plane 6 perpendicular to the axis X of the container 1, by which it can rest stably on a flat surface such as a table.
  • a seat 5 in the form of an annular bead (in this case O-ring) which extends in the extension of the body 2 and ends axially by a continuous annular face which forms the lower end of the container and defines a laying plane 6 perpendicular to the axis X of the container 1, by which it can rest stably on a flat surface such as a table.
  • D is the overall width, measured transversely, of the body 2.
  • this width D overall corresponds to a diameter.
  • the laying plane 6 extends radially over a width denoted d which, in the illustrated examples where the container 1 is symmetrical with revolution, corresponds to a diameter.
  • the seat 5 is connected externally to the body 2 by a fillet 7 with large radius; the diameter d of the laying plane 6 and the overall diameter D of the body are preferably in a ratio of between 0.65 and 0.9. In the example shown, this ratio is about 0.7:
  • the seat 5 Towards the inside of the container 1, the seat 5 is connected, by an annular cheek 8 in the form of a short radius fillet, to a membrane 9 conical open-angle angle (in the illustrated examples, this angle is about 135 °) and having a small radial extension.
  • the bottom 4 further comprises a conical arch 10 extending from an inner edge 11 of the membrane 9 inwardly of the container 1 to a central apex 12. From the inner edge 11 of the membrane 9 (which, given the small radial extension of the membrane 9, remains in the vicinity of the seat 5) to the top 12, the roof 10 has a cross section (perpendicular to the axis ) a starry profile.
  • this star-shaped profile is inscribed between an inner circle 13 (virtual) and an outer circle 14 (virtual) having respective diameters D1 and D2 whose ratio is greater than or equal to 0 7. According to a preferred embodiment illustrated in the figures, this ratio is between 0.8 and 0.9:
  • the star formed by the profile (in cross section) of the vault 10 has branches 15 whose radial extension is small compared to the radius (or diameter) overall of the star.
  • the vault 10 thus comprises a series of facets 16 which, grouped in pairs, define the branches 15 of the star.
  • the angles between the facets 16 of the same branch 15, and between two adjacent facets 16 of two adjacent branches, measured in a transverse plane and noted respectively A and B ( Figure 5), are preferably obtuse.
  • angles A, B are advantageously greater than or equal to 100 °.
  • angles A and B are about 100 ° and 150 °, respectively.
  • the roof 10 has an axial extension (or height), measured axially between the seat 5 and the top 12, denoted H.
  • H axial extension
  • the roof 10 is advantageously deep, that is to say that the height H of the vault is not negligible compared to the diameter d of the seat 5, the H / d ratio being greater than 0.25. In the illustrated examples, this ratio is about 0.3.
  • FIGS. 1-10 In a first exemplary embodiment, illustrated in FIGS.
  • the vault 10 is unitary and extends continuously from the membrane 9 to the top 12.
  • the arch 10 preferably has, in axial section (FIG. 4), a concavely curved profile turned towards the axis X of the container 1.
  • the radius of curvature of the arch denoted R0, is greater than or equal to equal to the seating diameter:
  • the vault 10 has an acute average angle C at the top, between 70 ° and 90 °. In the example illustrated (see FIG. 4), this average angle C at the vertex is about 80 °.
  • FIGS. 1-10 In a second exemplary embodiment, illustrated in FIGS.
  • the vault 10 is stepped and comprises two superimposed portions, namely a lower portion 17 on the side of the seat 5, and an upper portion 18 on the side of the top 12.
  • the lower portion 17 and the upper portion 18 both have in section a star-shaped profile inscribed between an inner circle 13 and an outer circle 14 having respective diameters D1 and D2 whose ratio D1 / D2 is greater than 0.7. ( Figures 9 and 10).
  • the lower portion 17 extends from the inner edge 11 of the membrane 9 (in the vicinity of the seat 5) to an intermediate joining zone 19 located at approximately mid-height of the roof 10, and the upper portion 18 extends from the intermediate junction zone 19 to the top 12 of the vault 10.
  • the lower portion 17 is substantially conical at an acute angle E at the vertex, this angle E at the vertex being preferably between 40 ° and 60 °, and for example about 50 °, as illustrated in FIG. 8.
  • the upper portion 18 is, in turn, substantially conical at an angle F obtuse at the top, this angle F at the vertex is preferably between 100 ° and 120 °, and for example about 110 °, as shown in FIG. 8.
  • the intermediate junction zone 19 (where a juncture between the lower portion 17 and the upper portion 18) is located approximately halfway up the vault 10, the lower portion 17 and the upper portion 18 have axial extensions (or heights), respectively denoted H1 and H2, equivalent or practically equivalent, such that:
  • the lower portion 17 has, in axial section, a concavely curved profile turned in the direction of the axis X of the container 1, whereas the upper portion 18 has, in axial section a concave curved profile turned away from the X axis.
  • the concavity of the vault 10 is reversed between the lower portion 17 and the upper portion 18 at their intermediate zone 19. junction.
  • the lower portion 17 and the upper portion 18 preferably have respective radii of curvature, denoted R1 and R2, which are of the same order of magnitude and are comparable to the radius of the laying plane.
  • the radii R1 and R2 are not of the same order of magnitude, but that R1 may be less than or equal to R2.
  • the radii R1 and R2 are for example in a ratio between 0.6 and 1:
  • This arch 10 gives the bottom 4 a good compromise between blowing and resistance to deformation.
  • the star shape of the vault 10 makes it possible to obtain a good axial stiffness, that is to say a good resistance to compression along the X axis, the 16 angular facets acting at the stiffening manner and opposing a reversal of the vault 10 under the effect of the pressure in the container 1.
  • the inversion of curvature in the stepped vault gives the latter the advantage of greater blowing, thanks to a lesser quantity of material necessary for its production.
  • Tests have thus demonstrated that a container having the vault 10 described above can be manufactured with a much lower blowing fluid pressure than that required for a container with vaults according to the prior art. More specifically, while a mean blowing pressure of between 35 and 38 bar was necessary to make a vault container of equivalent strength, the container 1 provided with the vault 10 described above can be made by injecting a fluid into a container. blowing pressure of the order of 24 bar, which represents a reduction of 30% to 40%. This results in lower requirements for blowing fluid and it becomes possible to employ smaller pressurized fluid production facilities.
  • the manufacture of the bottom 4 of the container 1 may advantageously be carried out by implementing a boxing technique, in which the mold in which the container 1 is formed has a movable mold bottom which makes it possible to overstretch the material at the bottom 4 , with the benefit of a good impression and a higher degree of crystallinity (favorable to the structural rigidity of the bottom).
  • the container 1 is particularly suitable for filling carbonated beverages, especially beer.

Abstract

The invention relates to a container (1) made from a plastic material and comprising a body (2) that extends along a main axis (X) and a base (4) that extends down from the body (2). The base (4) comprises: an annular support (5) defining a bearing plane (6); and a conical arch (10) that extends into the container (1) from close to the support (5) to a central apex (12), the cross-section of said arch (10) having a star-shaped profile inscribed between two circles (13, 14) of which the ratio of diameters (D1, D2) is greater than or equal to 0.7.

Description

Récipient comprenant un fond voûté à section étoilée  Container comprising a vaulted bottom with a star section
L'invention a trait aux récipients obtenus par soufflage ou étirage soufflage à partir d'ébauches (préformes ou récipients intermédiaires ayant subi une ou plusieurs opérations préalables de soufflage) en matière plastique. The invention relates to containers obtained by blow molding or stretching from blanks (preforms or intermediate containers having undergone one or more prior blowing operations) of plastic.
La fabrication par soufflage d'un récipient comprend une étape d'introduction, dans un moule à l'empreinte du récipient, d'une ébauche préalablement chauffée à une température supérieure à la température de transition vitreuse de la matière constitutive de la préforme (tel que PET), et une étape d'injection dans l'ébauche d'un fluide (tel que de l'air) sous pression. Un étirage au moyen d'une tige coulissante peut compléter le soufflage.  The blow-molding of a container comprises a step of introducing, into a mold in the impression of the container, a blank previously heated to a temperature greater than the glass transition temperature of the material constituting the preform (such as than PET), and a step of injection into the blank of a fluid (such as air) under pressure. Stretching by means of a sliding rod can complete the blowing.
Cette technique est connue de longue date. Il est également reconnu que la double orientation moléculaire (axiale et radiale) que subit la matière lors du soufflage ou de l'étirage soufflage est parfois trop faible pour conférer de façon certaine au récipient une tenue mécanique suffisante. Ce manque de tenue affecte surtout le fond du récipient, qui subit d'importantes contraintes dynamiques (lors du remplissage) et statiques (après le remplissage, par la seule pression du contenu).  This technique is known for a long time. It is also recognized that the double molecular orientation (axial and radial) that the material undergoes during blowing or stretch-blow molding is sometimes too weak to give the container a certain mechanical strength. This lack of holding mainly affects the bottom of the container, which undergoes significant dynamic (during filling) and static (after filling, by the pressure of the contents only) stresses.
Il est connu de rigidifier le fond d'un récipient en lui conférant une forme creuse définissant une voûte destinée à résister aux contraintes précitées. La seule présence d'une telle voûte pouvant se révéler insuffisante, il a même été proposé de la rigidifier au moyen de nervures radiales, cf. par ex. le brevet américain US 4 525401.  It is known to stiffen the bottom of a container by giving it a hollow shape defining a vault designed to withstand the aforementioned constraints. The mere presence of such a vault may be insufficient, it has even been proposed to stiffen it by means of radial ribs, cf. eg. US Patent 4,525,401.
Cette structure suppose néanmoins qu'un surcroît de matière soit alloué au fond, en raison des surépaisseurs créées par les nervures. Il en résulte, d'une part, une augmentation de la masse du récipient, contraire aux tendances actuelles d'économie de matière.  This structure assumes, however, that more material is allocated to the bottom, because of the extra thickness created by the ribs. The result is, on the one hand, an increase in the mass of the container, contrary to the current trends of saving material.
Il en résulte, d'autre part, des difficultés de soufflabilité (on nomme « soufflabilité » la capacité du récipient à être formé par soufflage, c'est-à-dire la capacité de la matière à épouser convenablement l'empreinte du moule), car l'épaisseur de la matière rend difficile son fluage dans les empreintes du moule correspondant aux nervures.  This results, on the other hand, blowing difficulties (called "blowing" capacity of the container to be formed by blowing, that is to say, the capacity of the material to marry properly the mold cavity) because the thickness of the material makes it difficult to creep into the cavities of the mold corresponding to the ribs.
Une solution ordinaire peut alors consister à augmenter la pression de soufflage, mais cette solution nécessite de réviser à la hausse les capacités du circuit d'injection pneumatique, au détriment du bilan énergétique du procédé de fabrication. An ordinary solution may then be to increase the blowing pressure, but this solution needs to be revised upwards. the capacity of the pneumatic injection circuit, to the detriment of the energy balance of the manufacturing process.
Une autre solution consiste à repousser la matière constitutive du fond du récipient, en utilisant pour cela, entre autres, un moule spécial équipé d'un fond de moule mobile en translation qui vient repousser la matière (cf. notamment le brevet européen EP 1 069 983). Le repoussage induit un accroissement du taux de déformation de la matière et donc une augmentation mécanique de sa cristallinité, la phase de repoussage conférant au fond du récipient sa forme définitive.  Another solution is to push back the constituent material of the bottom of the container, using for this, inter alia, a special mold equipped with a mold bottom movable in translation which pushes the material (see in particular the European patent EP 1 069 983). The repoussage induces an increase in the rate of deformation of the material and therefore a mechanical increase in its crystallinity, the repoussage phase conferring on the bottom of the container its final shape.
Mais cette technique, appelée « boxage », ne garantit pas que la rigidité du fond sera suffisante et n'exonère pas les constructeurs de recourir à des formes particulières qui demeurent soumises aux contraintes de soufflabilité.  But this technique, called "boxing", does not guarantee that the rigidity of the bottom will be sufficient and does not exonerate the manufacturers to resort to particular forms that remain subject to the constraints of blowing.
Le besoin persiste par conséquent de proposer des formes susceptibles de conférer au fond un bon compromis entre soufflabilité et rigidité structurelle (notamment pour résister aux déformations induites par une surpression dans le récipient, typiquement lorsque le contenu est une boisson carbonatée).  The need therefore remains to propose forms that can give the substance a good compromise between blowing and structural rigidity (in particular to withstand the deformations induced by an overpressure in the container, typically when the content is a carbonated beverage).
Afin de répondre à ce besoin, il est proposé un récipient en matière plastique, comprenant un corps s'étendant suivant un axe principal et un fond dans le prolongement du corps d'un côté inférieur de celui-ci, le fond comprenant :  In order to meet this need, there is provided a plastic container, comprising a body extending along a main axis and a bottom in the extension of the body of a lower side thereof, the bottom comprising:
une assise annulaire définissant un plan de pose ;  an annular seat defining a laying plane;
une voûte conique qui s'étend à partir d'un voisinage de l'assise vers l'intérieur du récipient jusqu'à un sommet central, cette voûte présentant en section transversale un profil étoilé inscrit entre deux cercles dont le rapport des diamètres est supérieur ou égal à a conical arch which extends from a neighborhood of the seat towards the interior of the container to a central summit, this arch having in cross section a star-shaped profile inscribed between two circles whose diameter ratio is greater than or equal to
0,7. 0.7.
Ce fond offre à la fois une bonne rigidité structurelle et une bonne soufflabilité, tout en ne nécessitant pas de surcroît de matière, au bénéfice de la légèreté du récipient.  This bottom offers both good structural rigidity and good blowing, while not requiring additional material, to the benefit of the lightness of the container.
Diverses caractéristiques supplémentaires peuvent être prévues, seules ou en combinaison :  Various additional features may be provided, alone or in combination:
le rapport des diamètres est compris entre 0,8 et 0,9 ;  the ratio of the diameters is between 0.8 and 0.9;
- la voûte comprend une série de facettes définissant entre elles des angles obtus dans un plan transversal ; the vault comprises a series of facets defining between them obtuse angles in a transverse plane;
les angles entre facettes sont supérieurs ou égaux à 100° ; la voûte présente deux portions superposées, à savoir une portion inférieure sensiblement conique à angle aigu, qui s'étend à partir du voisinage de l'assise jusqu'à une zone intermédiaire de jonction, et une section supérieure sensiblement conique à angle obtus, qui s'étend à partir de la zone intermédiaire de jonction jusqu'au sommet ; the angles between facets are greater than or equal to 100 °; the vault has two superimposed portions, namely a substantially conical lower portion at an acute angle, which extends from the vicinity of the seat to an intermediate zone of junction, and a substantially conical upper section with an obtuse angle, which extends from the intermediate junction zone to the summit;
la portion inférieure et la portion supérieure de la voûte présentent des extensions axiales équivalentes ou pratiquement équivalentes ;  the lower portion and the upper portion of the vault have equivalent or substantially equivalent axial extensions;
- la portion inférieure de la voûte présente, en section axiale, un profil courbe à concavité tournée en direction de l'axe du récipient ; - The lower portion of the arch has, in axial section, a curved profile concavity facing towards the axis of the container;
la portion supérieure de la voûte présente, en section axiale, un profil courbe à concavité tournée à l'opposé de l'axe du récipient. ; - en section axiale, les profils de la portion inférieure et de la portion supérieure présentent des rayons de courbure respectifs the upper portion of the arch has, in axial section, a curved profile concavity turned away from the axis of the container. ; in axial section, the profiles of the lower portion and of the upper portion have respective radii of curvature
R1 et R2 tels que le rapport R2/R1 est compris entre 0,6 et 1 ; la voûte présente une hauteur H mesurée axialement et l'assise présente une largeur d mesurée transversalement, le rapport H/d de ces dimensions étant supérieur à 0,25. R1 and R2 such that the ratio R2 / R1 is between 0.6 and 1; the roof has a height H measured axially and the seat has a width d measured transversely, the H / d ratio of these dimensions being greater than 0.25.
D'autres objets et avantages de l'invention apparaîtront à la lumière de la description d'un mode préféré de réalisation, faite ci- après en référence aux dessins annexés dans lesquels :  Other objects and advantages of the invention will become apparent in the light of the description of a preferred embodiment, given hereinafter with reference to the accompanying drawings in which:
la figure 1 est une vue en perspective par-dessous d'un récipient en matière plastique, suivant un premier exemple de réalisation ; la figure 2 est une vue en perspective, à échelle agrandie, du fond du récipient de la figure 1 ;  Figure 1 is a perspective view from below of a plastic container, according to a first embodiment; Figure 2 is a perspective view, on an enlarged scale, of the bottom of the container of Figure 1;
la figure 3 est une vue en plan, de dessous, du fond de la figure 2 ;  Figure 3 is a plan view, from below, of the bottom of Figure 2;
- la figure 4 est une section du fond du récipient des figures précédentes, selon le plan de coupe IV-IV de la figure 3 ; - Figure 4 is a section of the bottom of the container of the preceding figures, according to the sectional plane IV-IV of Figure 3;
la figure 5 est une section selon le plan de coupe V-V de la figure 4 ;  Figure 5 is a section along the sectional plane V-V of Figure 4;
la figure 6 est une vue similaire à la figure 2, illustrant un fond de récipient selon un second exemple de réalisation ; la figure 7 est une vue en plan, de dessous, du fond de la figure 6 ; Figure 6 is a view similar to Figure 2, illustrating a container bottom according to a second embodiment; Figure 7 is a plan view, from below, of the bottom of Figure 6;
la figure 8 est une section selon le plan de coupe VIII-VIII de la figure 7 ;  Figure 8 is a section along the section plane VIII-VIII of Figure 7;
- la figure 9 est une section selon le plan de coupe IX-IX de la figure 8 ; - Figure 9 is a section along the IX-IX section plane of Figure 8;
la figure 10 est une section selon le plan de coupe X-X de la figure 8.  Figure 10 is a section along the X-X section plane of Figure 8.
Sur la figure 1 est représenté un récipient 1 réalisé par étirage soufflage à partir d'une préforme en matière thermoplastique telle que PET (polyéthylène téréphtalate).  In Figure 1 is shown a container 1 made by stretching blow from a thermoplastic preform such as PET (polyethylene terephthalate).
Ce récipient 1 comprend un corps 2 de forme générale cylindrique de autour d'un axe X principal. Le corps 2 se prolonge, à une extrémité supérieure, par un col 3 formant un buvant et, à une extrémité inférieure, par un fond 4.  This container 1 comprises a body 2 of generally cylindrical shape around a main axis X. The body 2 is extended at an upper end by a neck 3 forming a rim and, at a lower end, by a bottom 4.
Le fond 4 comprend une assise 5 sous forme d'un bourrelet annulaire (en l'espèce torique) qui s'étend dans le prolongement du corps 2 et se termine axialement par une face continue et annulaire qui forme l'extrémité inférieure du récipient et définit un plan 6 de pose perpendiculaire à l'axe X du récipient 1, par lequel celui-ci peut reposer de manière stable sur une surface plane telle qu'une table.  The bottom 4 comprises a seat 5 in the form of an annular bead (in this case O-ring) which extends in the extension of the body 2 and ends axially by a continuous annular face which forms the lower end of the container and defines a laying plane 6 perpendicular to the axis X of the container 1, by which it can rest stably on a flat surface such as a table.
Comme visible sur la figure 3, on note D la largeur hors tout, mesurée transversalement, du corps 2. Lorsque le corps 2 est symétrique de révolution, cette largeur D hors tout correspond à un diamètre. Le plan 6 de pose, quant à lui, est perpendiculaire à l'axe X du récipient 1.  As can be seen in FIG. 3, D is the overall width, measured transversely, of the body 2. When the body 2 is symmetrical with revolution, this width D overall corresponds to a diameter. The laying plane 6, meanwhile, is perpendicular to the axis X of the container 1.
Comme on le voit sur les figures 4 et 8, le plan 6 de pose s'étend radialement sur une largeur notée d qui, dans les exemples illustrés où le récipient 1 est symétrique de révolution, correspond à un diamètre. L'assise 5 se raccorde extérieurement au corps 2 par un congé 7 à grand rayon ; le diamètre d du plan 6 de pose et le diamètre D hors tout du corps sont de préférence dans un rapport compris entre 0,65 et 0,9. Dans l'exemple illustré, ce rapport est d'environ 0,7 :  As seen in Figures 4 and 8, the laying plane 6 extends radially over a width denoted d which, in the illustrated examples where the container 1 is symmetrical with revolution, corresponds to a diameter. The seat 5 is connected externally to the body 2 by a fillet 7 with large radius; the diameter d of the laying plane 6 and the overall diameter D of the body are preferably in a ratio of between 0.65 and 0.9. In the example shown, this ratio is about 0.7:
d d
≡0,7  ≡0,7
Vers l'intérieur du récipient 1, l'assise 5 se raccorde, par une joue 8 annulaire sous forme d'un congé à faible rayon, à une membrane 9 conique à angle au sommet ouvert (dans les exemples illustrés, cet angle est de 135° environ) et présentant une faible extension radiale. Towards the inside of the container 1, the seat 5 is connected, by an annular cheek 8 in the form of a short radius fillet, to a membrane 9 conical open-angle angle (in the illustrated examples, this angle is about 135 °) and having a small radial extension.
Le fond 4 comprend en outre une voûte 10 conique qui s'étend à partir d'un bord 11 intérieur de la membrane 9 vers l'intérieur du récipient 1, jusqu'à un sommet 12 central. Du bord 11 intérieur de la membrane 9 (qui compte tenu de la faible extension radiale de la membrane 9, demeure au voisinage de l'assise 5) jusqu'au sommet 12, la voûte 10 présente en section transversale (perpendiculairement à l'axe) un profil étoilé.  The bottom 4 further comprises a conical arch 10 extending from an inner edge 11 of the membrane 9 inwardly of the container 1 to a central apex 12. From the inner edge 11 of the membrane 9 (which, given the small radial extension of the membrane 9, remains in the vicinity of the seat 5) to the top 12, the roof 10 has a cross section (perpendicular to the axis ) a starry profile.
Comme cela est visible sur les figures 5, 9 et 10, ce profil étoilé est inscrit entre un cercle 13 (virtuel) intérieur et un cercle 14 (virtuel) extérieur ayant des diamètres respectifs D1 et D2 dont le rapport est supérieur ou égal à 0,7. Selon un mode de réalisation préféré illustré sur les figures, ce rapport est compris entre 0,8 et 0,9 :  As can be seen in FIGS. 5, 9 and 10, this star-shaped profile is inscribed between an inner circle 13 (virtual) and an outer circle 14 (virtual) having respective diameters D1 and D2 whose ratio is greater than or equal to 0 7. According to a preferred embodiment illustrated in the figures, this ratio is between 0.8 and 0.9:
Dl  Dl
D2  D2
Et de préférence :  And preferably:
Dl  Dl
0,8<-<0,9  0.8 <- <0.9
En d'autres termes, l'étoile formée par le profil (en section transversale) de la voûte 10 présente des branches 15 dont l'extension radiale est faible au regard du rayon (ou du diamètre) hors tout de l'étoile.  In other words, the star formed by the profile (in cross section) of the vault 10 has branches 15 whose radial extension is small compared to the radius (or diameter) overall of the star.
La voûte 10 comprend ainsi une série de facettes 16 qui, groupées par paires, définissent les branches 15 de l'étoile. Les angles entre les facettes 16 d'une même branche 15, et entre deux facettes 16 adjacentes de deux branches 15 voisines, mesurés dans un plan transversal et notés respectivement A et B (figure 5), sont de préférence obtus.  The vault 10 thus comprises a series of facets 16 which, grouped in pairs, define the branches 15 of the star. The angles between the facets 16 of the same branch 15, and between two adjacent facets 16 of two adjacent branches, measured in a transverse plane and noted respectively A and B (Figure 5), are preferably obtuse.
Plus précisément, ces angles A, B sont avantageusement supérieurs ou égaux à 100°. Dans les exemples illustrés, les angles A et B sont d'environ 100° et 150°, respectivement.  More precisely, these angles A, B are advantageously greater than or equal to 100 °. In the illustrated examples, angles A and B are about 100 ° and 150 °, respectively.
La voûte 10 présente une extension axiale (ou hauteur), mesurée axialement entre l'assise 5 et le sommet 12, notée H. Comme on le voit sur les dessins, et plus particulièrement sur les figures 4 et 8, la voûte 10 est avantageusement profonde, c'est-à-dire que la hauteur H de la voûte n'est pas négligeable par rapport au diamètre d de l'assise 5, le rapport H/d étant supérieur à 0,25. Dans les exemples illustrés, ce rapport est de 0,3 environ. The roof 10 has an axial extension (or height), measured axially between the seat 5 and the top 12, denoted H. As can be seen in the drawings, and more particularly in FIGS. 4 and 8, the roof 10 is advantageously deep, that is to say that the height H of the vault is not negligible compared to the diameter d of the seat 5, the H / d ratio being greater than 0.25. In the illustrated examples, this ratio is about 0.3.
On a représenté sur les dessins deux exemples de réalisation du fond.  Two embodiments of the bottom are shown in the drawings.
Dans un premier exemple de réalisation, illustré sur les figures 1 à In a first exemplary embodiment, illustrated in FIGS.
5, la voûte 10 est unitaire et s'étend continûment de la membrane 9 au sommet 12. 5, the vault 10 is unitary and extends continuously from the membrane 9 to the top 12.
La voûte 10 présente de préférence, en section axiale (figure 4), un profil courbe à concavité tournée vers l'axe X du récipient 1. Dans l'exemple illustré, le rayon de courbure de la voûte, noté R0, est supérieur ou égal au diamètre d d'assise :  The arch 10 preferably has, in axial section (FIG. 4), a concavely curved profile turned towards the axis X of the container 1. In the example illustrated, the radius of curvature of the arch, denoted R0, is greater than or equal to equal to the seating diameter:
R0≥ d  R0≥ d
La voûte 10 présente un angle C moyen aigu au sommet, compris entre 70° et 90°. Dans l'exemple illustré (cf. figure 4), cet angle C moyen au sommet est de 80° environ.  The vault 10 has an acute average angle C at the top, between 70 ° and 90 °. In the example illustrated (see FIG. 4), this average angle C at the vertex is about 80 °.
Dans un second exemple de réalisation, illustré sur les figures 6 à In a second exemplary embodiment, illustrated in FIGS.
10, la voûte 10 est étagée et comprend deux portions superposées, à savoir une portion 17 inférieure du côté de l'assise 5, et une portion 18 supérieure du côté du sommet 12. 10, the vault 10 is stepped and comprises two superimposed portions, namely a lower portion 17 on the side of the seat 5, and an upper portion 18 on the side of the top 12.
Les caractéristiques de la voûte 10 exposées ci-dessus selon le premier exemple, en référence aux figures 2 à 5, s'appliquent à chacune des portions inférieure et supérieure de la voûte 10 selon le second exemple. En particulier, la portion 17 inférieure et la portion 18 supérieure présentent toutes deux en section un profil étoilé inscrit entre un cercle 13 intérieur et un cercle 14 extérieur ayant des diamètres respectifs D1 et D2 dont le rapport D1/D2 est supérieur à 0,7 (figures 9 et 10).  The characteristics of the vault 10 exhibited above according to the first example, with reference to FIGS. 2 to 5, apply to each of the lower and upper portions of the vault 10 according to the second example. In particular, the lower portion 17 and the upper portion 18 both have in section a star-shaped profile inscribed between an inner circle 13 and an outer circle 14 having respective diameters D1 and D2 whose ratio D1 / D2 is greater than 0.7. (Figures 9 and 10).
La portion 17 inférieure s'étend du bord 11 intérieur de la membrane 9 (au voisinage de l'assise 5) jusqu'à une zone 19 intermédiaire de jonction située à environ mi-hauteur de la voûte 10, et la portion 18 supérieure s'étend de la zone 19 intermédiaire de jonction jusqu'à au sommet 12 de la voûte 10.  The lower portion 17 extends from the inner edge 11 of the membrane 9 (in the vicinity of the seat 5) to an intermediate joining zone 19 located at approximately mid-height of the roof 10, and the upper portion 18 extends from the intermediate junction zone 19 to the top 12 of the vault 10.
La portion 17 inférieure est sensiblement conique à angle E aigu au sommet, cet angle E au sommet étant de préférence compris entre 40° et 60°, et par exemple de 50° environ, comme cela est illustré sur la figure 8. La portion 18 supérieure est, quant à elle, sensiblement conique à angle F obtus au sommet, cet angle F au sommet étant de préférence compris entre 100° et 120°, et par exemple de 110° environ, comme cela est illustré sur la figure 8. The lower portion 17 is substantially conical at an acute angle E at the vertex, this angle E at the vertex being preferably between 40 ° and 60 °, and for example about 50 °, as illustrated in FIG. 8. The upper portion 18 is, in turn, substantially conical at an angle F obtuse at the top, this angle F at the vertex is preferably between 100 ° and 120 °, and for example about 110 °, as shown in FIG. 8.
La zone 19 intermédiaire de jonction (où se produit un décrochement entre la portion 17 inférieure et la portion 18 supérieure) étant située à environ mi-hauteur de la voûte 10, la portion 17 inférieure et la portion 18 supérieure présentent des extensions axiales (ou hauteurs), respectivement notées H1 et H2, équivalentes ou pratiquement équivalentes, telles que :  The intermediate junction zone 19 (where a juncture between the lower portion 17 and the upper portion 18) is located approximately halfway up the vault 10, the lower portion 17 and the upper portion 18 have axial extensions (or heights), respectively denoted H1 and H2, equivalent or practically equivalent, such that:
H  H
H1 = H2 = - 2  H1 = H2 = - 2
Avantageusement, et comme cela est visible sur la figure 8, la portion 17 inférieure présente, en section axiale, un profil courbe à concavité tournée en direction de l'axe X du récipient 1, tandis que la portion 18 supérieure présente, en section axiale, un profil courbe à concavité tournée à l'opposé de l'axe X. En d'autres termes, la concavité de la voûte 10 s'inverse entre la portion 17 inférieure et la portion 18 supérieure, au niveau de leur zone 19 intermédiaire de jonction.  Advantageously, and as can be seen in FIG. 8, the lower portion 17 has, in axial section, a concavely curved profile turned in the direction of the axis X of the container 1, whereas the upper portion 18 has, in axial section a concave curved profile turned away from the X axis. In other words, the concavity of the vault 10 is reversed between the lower portion 17 and the upper portion 18 at their intermediate zone 19. junction.
La portion 17 inférieure et la portion 18 supérieure présentent de préférence des rayons de courbure respectifs, notés R1 et R2, qui sont du même ordre de grandeur et sont comparables au rayon du plan de pose.  The lower portion 17 and the upper portion 18 preferably have respective radii of curvature, denoted R1 and R2, which are of the same order of magnitude and are comparable to the radius of the laying plane.
d  d
R1 = R2 = - 2  R1 = R2 = - 2
Il est toutefois envisageable que les rayons R1 et R2 ne soient pas du même ordre de grandeur, mais que R1 puisse être inférieur ou égal à R2. Ainsi, selon un mode particulier de réalisation, les rayons R1 et R2 sont par exemple dans un rapport compris entre 0,6 et 1 :  It is conceivable, however, that the radii R1 and R2 are not of the same order of magnitude, but that R1 may be less than or equal to R2. Thus, according to a particular embodiment, the radii R1 and R2 are for example in a ratio between 0.6 and 1:
RI  RI
0,6 <——■ < 1 0.6 <- ■ <1
R2  R2
Cette voûte 10 confère au fond 4 un bon compromis entre soufflabilité et résistance à la déformation.  This arch 10 gives the bottom 4 a good compromise between blowing and resistance to deformation.
En particulier, la forme étoilée de la voûte 10 permet d'obtenir une bonne raideur axiale, c'est-à-dire une bonne résistance à la compression suivant l'axe X, les facettes 16 anguleuses agissant à la manière de raidisseurs et s'opposant à un retournement de la voûte 10 sous l'effet de la pression régnant dans le récipient 1. In particular, the star shape of the vault 10 makes it possible to obtain a good axial stiffness, that is to say a good resistance to compression along the X axis, the 16 angular facets acting at the stiffening manner and opposing a reversal of the vault 10 under the effect of the pressure in the container 1.
Cependant, cette raideur n'est pas obtenue au détriment de la soufflabilité, grâce à la faible extension radiale de l'étoile formée par la section transversale de la voûte 10. Les angles A, B ouverts (ou obtus) entre les facettes 16, les rayons R0, R1 , R2 de courbure choisis de même que les rapports dimensionnels R1/R2 et H/d contribuent également à la bonne soufflabilité du fond 4.  However, this stiffness is not obtained to the detriment of the blowing, thanks to the small radial extension of the star formed by the cross section of the vault 10. The angles A, B open (or obtuse) between the facets 16, the radii R0, R1, R2 of curvature chosen as well as the dimensional ratios R1 / R2 and H / d also contribute to the good blowing of the bottom 4.
L'inversion de courbure dans la voûte 10 étagée confère à celle-ci l'avantage d'une plus grande soufflabilité, grâce à une moindre quantité de matière nécessaire à sa réalisation. Des essais ont ainsi mis en évidence qu'un récipient comportant la voûte 10 décrite ci-dessus peut être fabriqué avec une pression de fluide de soufflage bien moindre que celle nécessaire à un récipient avec des voûtes selon l'art antérieur. Plus précisément, tandis qu'une pression moyenne de soufflage comprise entre 35 et 38 bar était nécessaire pour réaliser un récipient à voûte à résistance équivalente, le récipient 1 muni de la voûte 10 décrite ci-dessus peut être réalisé en injectant un fluide à une pression de soufflage de l'ordre de 24 bar, ce qui représente une réduction de 30% à 40%. Il en résulte des besoins moindres en fluide de soufflage et il devient possible d'employer des installations de production de fluide sous pression de moindre taille.  The inversion of curvature in the stepped vault gives the latter the advantage of greater blowing, thanks to a lesser quantity of material necessary for its production. Tests have thus demonstrated that a container having the vault 10 described above can be manufactured with a much lower blowing fluid pressure than that required for a container with vaults according to the prior art. More specifically, while a mean blowing pressure of between 35 and 38 bar was necessary to make a vault container of equivalent strength, the container 1 provided with the vault 10 described above can be made by injecting a fluid into a container. blowing pressure of the order of 24 bar, which represents a reduction of 30% to 40%. This results in lower requirements for blowing fluid and it becomes possible to employ smaller pressurized fluid production facilities.
La fabrication du fond 4 du récipient 1 peut être avantageusement réalisée en mettant en œuvre une technique de boxage, dans laquelle le moule au sein duquel est formé le récipient 1 présente un fond de moule mobile qui permet de surétirer la matière au niveau du fond 4, au bénéfice d'une bonne prise d'empreinte et d'un taux de cristallinité supérieur (favorable à la rigidité structurelle du fond).  The manufacture of the bottom 4 of the container 1 may advantageously be carried out by implementing a boxing technique, in which the mold in which the container 1 is formed has a movable mold bottom which makes it possible to overstretch the material at the bottom 4 , with the benefit of a good impression and a higher degree of crystallinity (favorable to the structural rigidity of the bottom).
Muni d'un tel fond 4, le récipient 1 est particulièrement adapté au remplissage des boissons carbonatées, notamment de la bière.  Equipped with such a bottom 4, the container 1 is particularly suitable for filling carbonated beverages, especially beer.

Claims

REVENDICATIONS
1. Récipient (1) en matière plastique, comprenant un corps (2) s'étendant suivant un axe (X) principal et un fond (4) dans le prolongement du corps (2) d'un côté inférieur de celui-ci, le fond (4) comprenant : A plastic container (1), comprising a body (2) extending along a main axis (X) and a bottom (4) in the extension of the body (2) on a lower side thereof, the bottom (4) comprising:
une assise (5) annulaire définissant un plan (6) de pose ;  an annular seat (5) defining a laying plane (6);
une voûte (10) conique qui s'étend à partir d'un voisinage de l'assise (5) vers l'intérieur du récipient (1) jusqu'à un sommet (12) central,  a conical arch (10) extending from a vicinity of the seat (5) towards the interior of the container (1) to a central apex (12),
caractérisé en ce que la voûte (10) présente en section transversale un profil étoilé inscrit entre deux cercles (13, 14) dont le rapport des diamètres (D1, D2) est supérieur ou égal à 0,7. characterized in that the arch (10) has in cross section a star-shaped profile inscribed between two circles (13, 14) whose ratio of diameters (D1, D2) is greater than or equal to 0.7.
2. Récipient (1) selon la revendication 1, caractérisé en ce que le rapport des diamètres (D1, D2) est compris entre 0,8 et 0,9.  2. Container (1) according to claim 1, characterized in that the ratio of diameters (D1, D2) is between 0.8 and 0.9.
3. Récipient (1) selon l'une des revendications précédentes, caractérisé en ce que la voûte (10) comprend une série de facettes (16) définissant entre elles des angles (A, B) obtus dans un plan transversal.  3. Container (1) according to one of the preceding claims, characterized in that the roof (10) comprises a series of facets (16) defining between them angles (A, B) obtuse in a transverse plane.
4. Récipient (1) selon la revendication 3, caractérisé en ce que les angles (A, B) entre facettes (16) sont supérieurs ou égaux à 100°.  4. Container (1) according to claim 3, characterized in that the angles (A, B) between facets (16) are greater than or equal to 100 °.
5. Récipient (1) selon l'une des revendications précédentes, caractérisé en ce que la voûte (10) présente deux portions superposées, à savoir une portion (17) inférieure sensiblement conique à angle aigu, qui s'étend à partir du voisinage de l'assise (5) jusqu'à une zone (19) intermédiaire de jonction, et une section (18) supérieure sensiblement conique à angle obtus, qui s'étend à partir de la zone (19) intermédiaire de jonction jusqu'au sommet (12).  5. Container (1) according to one of the preceding claims, characterized in that the roof (10) has two superimposed portions, namely a portion (17) substantially conical lower acute angle, which extends from the vicinity from the seat (5) to an intermediate junction area (19), and a substantially obtuse upper cone-shaped upper section (18) extending from the intermediate joining area (19) to summit (12).
6. Récipient (1) selon la revendication 5, caractérisé en ce que la portion (17) inférieure et la portion (18) supérieure de la voûte (10) présentent des extensions axiales (H1, H2) équivalentes ou pratiquement équivalentes.  6. Container (1) according to claim 5, characterized in that the portion (17) and the lower portion (18) upper of the vault (10) have axial extensions (H1, H2) equivalent or substantially equivalent.
7. Récipient (1) selon la revendication 5 ou la revendication 6, caractérisé en ce que la portion (17) inférieure de la voûte (10) présente, en section axiale, un profil courbe à concavité tournée en direction de l'axe (X) du récipient (1). Container (1) according to claim 5 or claim 6, characterized in that the lower portion (17) of the arch (10) has, in axial section, a concavely curved profile turned in the direction of the axis ( X) of the container (1).
8. Récipient (1) selon l'une des revendications 5 à 7, caractérisé en ce que la portion (18) supérieure de la voûte (10) présente, en section axiale, un profil courbe à concavité tournée à l'opposé de l'axe (X) du récipient (1 ). 8. Container (1) according to one of claims 5 to 7, characterized in that the portion (18) of the upper vault (10) has, in axial section, a concave curved profile facing away from the axis (X) of the container (1).
9. Récipient (1) selon les revendications 7 et 8, prises en combinaison, caractérisé en ce qu'en section axiale, les profils de la portion (17) inférieure et de la portion (18) supérieure présentent des rayons de courbure respectifs R1 et R2 tels que le rapport R2/R1 est compris entre 0,6 et 1.  9. Container (1) according to claims 7 and 8, taken in combination, characterized in that in axial section, the profiles of the portion (17) and the lower portion (18) upper have respective radii of curvature R1 and R2 such that the ratio R2 / R1 is between 0.6 and 1.
10. Récipient (1) selon l'une des revendications précédentes, caractérisé en ce que la voûte (10) présente une hauteur (H) mesurée axialement, en ce que l'assise présente une largeur (d) mesurée transversalement, le rapport (H/d) de ces dimensions étant supérieur à 0,25.  10. Container (1) according to one of the preceding claims, characterized in that the roof (10) has a height (H) measured axially, in that the seat has a width (d) measured transversely, the ratio ( H / d) of these dimensions being greater than 0.25.
EP13719993.1A 2012-04-17 2013-04-10 Container comprising an arched base having a star-shaped cross-section Active EP2785603B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1253543A FR2989356B1 (en) 2012-04-17 2012-04-17 CONTAINER COMPRISING A VOUTE BACKGROUND WITH ETOILEE SECTION
PCT/FR2013/050773 WO2013156710A1 (en) 2012-04-17 2013-04-10 Container comprising an arched base having a star-shaped cross-section

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EP2785603A1 true EP2785603A1 (en) 2014-10-08
EP2785603B1 EP2785603B1 (en) 2018-12-26

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EP (1) EP2785603B1 (en)
CN (1) CN104136329B (en)
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MX (1) MX350909B (en)
PL (1) PL2785603T3 (en)
WO (1) WO2013156710A1 (en)

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Publication number Publication date
EP2785603B1 (en) 2018-12-26
US9598201B2 (en) 2017-03-21
FR2989356B1 (en) 2014-04-11
FR2989356A1 (en) 2013-10-18
CN104136329A (en) 2014-11-05
WO2013156710A1 (en) 2013-10-24
MX350909B (en) 2017-09-25
US20150136725A1 (en) 2015-05-21
PL2785603T3 (en) 2019-08-30
CN104136329B (en) 2016-08-17
MX2014010087A (en) 2014-09-16

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