EP2051910B1 - Bottom of a hollow body obtained by blowing or stretch-blowing a preform of a thermoplastic material, and hollow body comprising such a bottom - Google Patents

Bottom of a hollow body obtained by blowing or stretch-blowing a preform of a thermoplastic material, and hollow body comprising such a bottom Download PDF

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Publication number
EP2051910B1
EP2051910B1 EP07823285A EP07823285A EP2051910B1 EP 2051910 B1 EP2051910 B1 EP 2051910B1 EP 07823285 A EP07823285 A EP 07823285A EP 07823285 A EP07823285 A EP 07823285A EP 2051910 B1 EP2051910 B1 EP 2051910B1
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EP
European Patent Office
Prior art keywords
hollow body
support surface
transverse
transverse support
body according
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Not-in-force
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EP07823285A
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German (de)
French (fr)
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EP2051910A2 (en
Inventor
Mikaël DERRIEN
Michel Boukobza
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Sidel Participations SAS
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Sidel Participations SAS
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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
    • B65D1/02—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

Definitions

  • the invention relates to the technical field of hollow bodies made of thermoplastic material, in particular containers such as pots or bottles.
  • the invention relates more particularly to hollow bodies obtained by blowing or stretching then blowing a preform injected with thermoplastic material (injection blow molding).
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • PP polypropylene
  • PAN polyacrylonitrile
  • heat setting treatment in which, just after blowing of the preform and while the container is still in contact with the walls of the mold blowing, a temperature of between 120 and 250 ° C is applied to the material for a few seconds. Then the container is cooled while being kept under pressure.
  • This heat treatment promotes crystal growth.
  • this heat treatment causes the growth of spherulites, this spherulitic crystallization being slow and isotropic.
  • the material of the "pellet” becomes whitish and opaque.
  • the heat treatment increases the crystallinity without formation of spherulites, and without modifying the transparency of the material.
  • thermoplastic containers must have good resistance of their bottom.
  • the bi-oriented PET has good mechanical and thermal resistance. But, as has been said above, the bottom of the containers is much stretched that the body of the containers, so that this bottom has mechanical and thermal resistance lower than those of the body.
  • the bottom of the container must withstand shocks, for example when the full container falls.
  • the container bottom must withstand the internal pressure, especially when the container contains a carbonated beverage.
  • An internal overpressure may result from an increase in the storage temperature of the full bottles and / or the withdrawal of the plastic material from these bottles, this withdrawal generally occurring within two or three weeks of their manufacture and filling.
  • the bottles are transported under load palletized and stacked. So that, except for placement of inserts, the bottom of the bottles of the upper layers rest on the caps of the lower bottles and are subject to stresses of depression and punching.
  • the container bottom must resist creep.
  • the container as a whole, and in particular its bottom, must withstand the relatively severe thermal conditions encountered during hot filling or pasteurization.
  • the bottom When hot filling with a liquid at a temperature of at most 94 ° C, the bottom must have a relative aptitude for deformation. It is the same during the subsequent cooling, the bottom having to withstand the vacuum (vacuum compensation).
  • the bottom of the containers must sometimes withstand cleaning agents in the case of reusable containers.
  • the bottom wall is then generally convex outward and has feet, typically four to six feet formed by excrescences regularly distributed on the bottom, and separated in pairs by a portion of the convex bottom wall.
  • These petaloid bottoms are widely used for containers containing carbonated beverages.
  • the radial recesses separating the feet absorb the forces due to the pressurization during filling and maintain the bearing surfaces of the feet in a plane substantially perpendicular to the axis of the container. This solution is not always satisfactory. Under the effect of internal pressure, the petaloid bottoms may burst.
  • the petaloid bottoms can not always withstand the overpressure due to the increase in volume of the contents of the bottle, during a pasteurization.
  • the document FR 2,717,443 describes a bottle in which the ribs depart from the periphery of the bottom and end at the outer limit of a substantially flat annular zone surrounding an amorphous concave central portion.
  • the document FR 2,753,435 of the applicant describes a container whose bottom comprises a central portion unstretched and a peripheral portion connecting the central portion to the side wall of the container, the bottom being provided with ribs extending from the side wall to the theoretical end limit of the unstretched central portion. This theoretical extreme limit takes into account the slight fluctuations in the shape and dimensions of the central part of the bottom (pellet), from one bottle to another of the same series. No rib ends in the amorphous part.
  • the aim of the invention is to provide a new bottle bottom structure whose set of individual characteristics makes it possible to obtain a resistance greater than that of most of the funds currently known, and enables it to recover "naturally" its shape after a constraint. (fall or other) having caused its deformation.
  • a bottom according to the invention will be more resistant than most previously known bottoms bottoms.
  • a bottom according to the invention can be made with a material thickness less than most funds previously known.
  • the invention also aims to provide a bottle having good resistance to hot filling and good resistance to pasteurization.
  • the invention relates, in a first aspect, to a body base with the features of claim 1.
  • the bottom is in the form of a body of revolution about an axis substantially perpendicular to its transverse bearing surface.
  • the bottom has, in vertical radial section, between the outer edge and the transverse support surface, a substantially parabolic profile.
  • the bottom has a transverse bearing surface of annular shape. Starting from this annular surface and moving towards the axis of revolution, the bottom preferably has first an annular step, then a substantially parabolic profile connecting this step to the central transverse portion.
  • the invention relates, in a second aspect to a hollow body of thermoplastic material, in particular polyester such as PET, obtained by blow molding or stretch blow molding of a preform, this hollow body comprising a side wall and a bottom connected to this side wall said bottom being as presented above.
  • the bottom 2 is in the form of a body of revolution about an axis 3 substantially perpendicular to its transverse support surface 4.
  • the bottom 2 will be described starting from its outer edge 5 and going radially towards the axis 3 of revolution.
  • the outer edge 5 is transverse and substantially corresponds to the junction between the bottom 2 and the side wall of the container (not shown). This outer edge 5 is placed at a height h5 relative to the transverse bearing surface 4 of the bottom 2 (and the bottle comprising the bottom 2, when the bottle is stored standing).
  • the bottom has in vertical radial section a substantially parabolic profile.
  • this profile 6 is substantially tangential to a direction 7 perpendicular to the transverse bearing surface 4.
  • this profile 6 is substantially tangential to the transverse bearing surface 4. The profile 6 thus provides a solution of continuity, without rupture of curvature, between the side wall of the container (not shown) and the transverse bearing surface 4.
  • the bottom 2 has a transverse bearing surface 4 of annular shape. Starting from this transverse bearing surface 4 and moving towards the axis 3 of revolution, the bottom 2 has an annular step 8 of width (measured radially) substantially equal to the width of the annular transverse bearing surface 4. 8 annular step allows the deformation of the bottom 2 in the manner of a bellows, under the effect of an overpressure or vacuum in the hollow body provided with such a bottom.
  • the bottom 2 Starting from this annular step 8 and going towards the axis 3 of revolution, the bottom 2 then has, in vertical radial section, a substantially parabolic profile 9 and then a transverse central portion 10.
  • the transverse central portion 10 is placed at a height h 10 relative to the transverse bearing surface 4, this height h10 being greater than that h5 of the outer edge 5.
  • An axial pellet 11 protrudes into the transverse central portion 10, this pellet 11 axially projecting downwards, that is to say the outside of the container provided with the bottom 2.
  • These radial ribs 1 have an outer edge 12 coming close to the outer edge 5 of the bottom 2. As illustrated, preferably, the outer edge 12 of the radial ribs 1 does not reach this outer edge 5 of the bottom 2, although this is perfectly conceivable and does not change the qualities of the background; it is even possible to alternate ribs reaching the outer edge and others not.
  • These radial ribs 1 have an inner edge 13 coming close to the transverse central portion 10, but without reaching this transverse central portion 10.
  • Each radial rib 1 comprises a bottom wall 14 and a flange 15, 16 on either side of this bottom wall 14.
  • the bottom wall 14 is substantially constant width over the entire rib length.
  • Sectional view, each radial rib 1 has a plane 17 of radial vertical symmetry and the bottom wall 14 has a substantially identical contour to that formed by the profile 6, the transverse bearing surface 4, and the profile 9.
  • the bottom wall 14 is substantially flat or slightly curved.
  • the two lateral wings 15, 16 are substantially facing one another at the distal end of the ribs, and in particular in the vicinity of their outer edge 12.
  • the two wings 15, 16 laterals deviate from one another and the ribs flare more and more as one approaches the axis 3 of revolution.
  • the reinforcement ribs 1 thus have a very open U-shaped section, when these reinforcing ribs 1 are seen in a plane perpendicular to their bottom wall 14.
  • the radial ribs 1 thus come to bear against a central chimney 18 in the center of which protrudes, downwards, the pellet 11, this central chimney 18 being limited upwards by the transverse central portion 10.
  • a bottom according to the invention makes it possible to obtain a resistance greater than that of most currently known funds.
  • a bottom according to the invention will be more resistant than most previously known bottoms bottoms.
  • a desired strength, a bottom according to the invention can be made with a material thickness less than most funds previously known.
  • a bottle comprising a bottom according to the invention has a good resistance to hot filling and good resistance to pasteurization.
  • the central chimney 18 is particularly well reinforced with respect to creep or slump by the presence of reinforcement ribs 1 flaring from their distal end (where these ribs have a U-shaped section with substantially parallel and short flanges ) to their proximal end (where these ribs have a very open U-section with longer, curved wings).
  • a bottle comprising a bottom according to the invention also has good impact resistance on the lower part of the side wall, the ribs projecting over this lower part.
  • the bottom absorbs shocks perfectly and is able to recover "naturally" its initial shape after deformation.
  • the ribs 1 of reinforcement are six in number and substantially identical and equidistant.
  • the reinforcing ribs are more or less numerous, in particular to take into account the diameter of the bottom.
  • the reinforcing ribs may be of different sizes, a first series may have a bottom wall narrower than the bottom wall of a second series of ribs.

Abstract

A bottom (2) of a hollow body obtained by blowing or stretch-blowing a preform of a thermoplastic material. The bottom (2) includes a transverse support surface (4) and, on either side of the transverse support surface (4), a transverse outer edge (5) and a concave inner wall with a transverse central portion (10) having a pellet (11) of a low-crystallinity material. The pellet corresponds to the injection point of the perform. The bottom (2) has reinforcing ribs (1) having an outer edge (12) adjacent to the outer edge (5) of the bottom (2) as well as an inner edge (13) adjacent to the transverse central portion (10) but not reaching the transverse central portion (10). The reinforcing ribs (1) flare from their outer edge (12) toward their inner edge (13).

Description

L'invention se rapporte au domaine technique des corps creux en matériau thermoplastique, notamment récipients tels que pots ou bouteilles.The invention relates to the technical field of hollow bodies made of thermoplastic material, in particular containers such as pots or bottles.

L'invention concerne plus particulièrement les corps creux obtenus par soufflage ou étirage puis soufflage d'une préforme injectée en matière thermoplastique (injection-soufflage).The invention relates more particularly to hollow bodies obtained by blowing or stretching then blowing a preform injected with thermoplastic material (injection blow molding).

Depuis quelques années, la fabrication de récipients en matière plastique à partir de préformes préalablement injectées a connu un essor considérable, notamment grâce à l'emploi du polyéthylène téréphtalate (PET).In recent years, the manufacture of plastic containers from pre-injected preforms has grown considerably, especially thanks to the use of polyethylene terephthalate (PET).

Entre-temps, d'autres matériaux ont été envisagés et/ou utilisés avec plus ou moins de succès tels, à titre d'exemples non limitatifs, le polyéthylène naphtalate (PEN), le polypropylène (PP), le polyacrylonitrile (PAN) ou des mélanges ou superpositions de divers matériaux.Meanwhile, other materials have been envisaged and / or used with more or less success such as, by way of non-limiting examples, polyethylene naphthalate (PEN), polypropylene (PP), polyacrylonitrile (PAN) or mixtures or overlays of various materials.

Il subsiste habituellement, au centre du fond du corps creux, une zone à très faible cristallinité dite « pastille » résultant d'une partie de la préforme qui n'est que très faiblement étirée lors du soufflage ou de l'étirage soufflage. L'axe longitudinal de la préforme correspond en effet à celui du récipient final. Il en résulte que lors du soufflage ou de l'étirage soufflage, l'étirage du PET est quasiment nul au centre du fond du récipient, et s'accroît au fur et à mesure que l'on se rapproche de la paroi latérale du récipient.There is usually in the center of the bottom of the hollow body, a very low crystallinity zone called "pellet" resulting from a portion of the preform that is only very slightly stretched during blowing or stretch blow molding. The longitudinal axis of the preform corresponds to that of the final container. As a result, during blow molding or stretch blow molding, the stretching of PET is almost zero in the center of the bottom of the container, and increases as one approaches the side wall of the container. .

Les récipients en PET bi orientés conventionnels présentent, lorsqu'ils sont portés à une température supérieure à la température de transition vitreuse, un retrait important, par libération des contraintes.Conventional bi-oriented PET containers exhibit, when they are heated to a temperature above the glass transition temperature, a large shrinkage, by stress release.

Pour pallier ce problème, il est connu depuis longtemps d'effectuer un traitement thermique dit « thermofixation » (heat setting), traitement dans lequel, juste après le soufflage de la préforme et alors que le récipient est encore en contact avec les parois du moule de soufflage, une température comprise entre 120 et 250°C environ est appliquée au matériau pendant quelques secondes. Puis le récipient est refroidi en étant maintenu sous pression.To alleviate this problem, it has long been known to carry out a heat treatment called "heat setting" treatment, in which, just after blowing of the preform and while the container is still in contact with the walls of the mold blowing, a temperature of between 120 and 250 ° C is applied to the material for a few seconds. Then the container is cooled while being kept under pressure.

Ce traitement thermique favorise la croissance cristalline. Dans la partie amorphe de la bouteille (en particulier dans la zone centrale du fond correspondant au point d'injection de la préforme), ce traitement thermique provoque la croissance de sphérolites, cette cristallisation sphérolitique étant lente et isotrope. Le matériau de la « pastille » devient blanchâtre et opaque. Par contre, dans les autres parties de la bouteille, qui ont subi la bi orientation, le traitement thermique augmente la cristallinité sans formation de sphérolites, et sans modification de la transparence du matériau.This heat treatment promotes crystal growth. In the amorphous part of the bottle (in particular in the central zone of the bottom corresponding to the injection point of the preform), this heat treatment causes the growth of spherulites, this spherulitic crystallization being slow and isotropic. The material of the "pellet" becomes whitish and opaque. On the other hand, in the other parts of the bottle, which have undergone the orientation, the heat treatment increases the crystallinity without formation of spherulites, and without modifying the transparency of the material.

Quel que soit leur procédé de fabrication, les récipients en matière thermoplastique doivent présenter une bonne résistance de leur fond.Whatever their manufacturing process, thermoplastic containers must have good resistance of their bottom.

Le PET bi orienté présente une bonne résistance mécanique et thermique. Mais, ainsi qu'il a été dit plus haut, le fond des récipients est beaucoup mois étiré que le corps des récipients, de sorte que ce fond présente des résistances mécaniques et thermiques inférieures à celles du corps.The bi-oriented PET has good mechanical and thermal resistance. But, as has been said above, the bottom of the containers is much stretched that the body of the containers, so that this bottom has mechanical and thermal resistance lower than those of the body.

Le même problème existe pour le col. Le traitement thermique des cols permet d'augmenter leur cristallinité. Mais le traitement thermique des cols (en PET amorphe) conduit à une cristallisation isotherme formant des sphérolites, le PET thermo durci obtenu n'étant donc plus du tout translucide. S'il est acceptable que les cols de bouteilles, relativement épais, ne soient pas translucides, un fond de bouteille peu translucide nuirait à la présentation du produit conditionné.The same problem exists for the collar. The heat treatment of the necks makes it possible to increase their crystallinity. But the heat treatment of the necks (in amorphous PET) leads to isothermal crystallization forming spherulites, the thermo-hardened PET obtained is thus no longer translucent at all. If it is acceptable that the necks of bottles, relatively thick, are not translucent, a bottom of translucent bottle would harm the presentation of the packaged product.

Le fond du récipient doit résister aux chocs, par exemple lorsque le récipient plein chute.The bottom of the container must withstand shocks, for example when the full container falls.

Le fond de récipient doit résister à la pression interne, en particulier lorsque le récipient contient une boisson carbonatée. Une surpression interne peut résulter d'une augmentation de la température de stockage des bouteilles pleines et/ou du retrait de la matière plastique de ces bouteilles, ce retrait se produisant en général au cours des deux ou trois semaines suivant leur fabrication et leur remplissage.The container bottom must withstand the internal pressure, especially when the container contains a carbonated beverage. An internal overpressure may result from an increase in the storage temperature of the full bottles and / or the withdrawal of the plastic material from these bottles, this withdrawal generally occurring within two or three weeks of their manufacture and filling.

Les bouteilles sont transportées en charge palettisées et gerbées. De sorte que, sauf mises en place d'intercalaires, le fonds des bouteilles des couches supérieures reposent sur les bouchons des bouteilles inférieures et sont soumis à des contraintes d'enfoncement et de poinçonnement.The bottles are transported under load palletized and stacked. So that, except for placement of inserts, the bottom of the bottles of the upper layers rest on the caps of the lower bottles and are subject to stresses of depression and punching.

Toute déformation du fond du récipient affecte l'esthétique du produit et la stabilité du récipient stocké debout.Any deformation of the bottom of the container affects the aesthetics of the product and the stability of the container stored upright.

Le fond de récipient doit résister au fluage.The container bottom must resist creep.

Le récipient dans son ensemble, et en particulier son fond, doit résister aux conditions thermiques relativement sévères rencontrées lors d'un remplissage à chaud ou d'une pasteurisation.The container as a whole, and in particular its bottom, must withstand the relatively severe thermal conditions encountered during hot filling or pasteurization.

Lors d'un remplissage à chaud avec un liquide à une température au plus égale à 94°C, le fond doit présenter une relative aptitude à la déformation. Il en va de même lors du refroidissement ultérieur, le fond devant résister à la dépression (vacuum compensation).When hot filling with a liquid at a temperature of at most 94 ° C, the bottom must have a relative aptitude for deformation. It is the same during the subsequent cooling, the bottom having to withstand the vacuum (vacuum compensation).

Toute déformation du fond du récipient affecte l'esthétique du produit et la stabilité du récipient stocké debout.Any deformation of the bottom of the container affects the aesthetics of the product and the stability of the container stored upright.

Le fond des récipients doit parfois résister à des agents de nettoyage, dans le cas de récipients réutilisables.The bottom of the containers must sometimes withstand cleaning agents in the case of reusable containers.

Il a été proposé de réaliser les récipients avec des fonds pétaloïdes. La paroi de fond est alors de forme générale convexe vers l'extérieur et comporte des pieds, typiquement quatre à six pieds formés par des excroissances régulièrement réparties sur le fond, et séparés deux à deux par une portion de la paroi de fond convexe. Ces fonds pétaloïdes sont largement employés pour les récipients contenant des boissons carbonatées. Les creux radiaux séparant les pieds absorbent les efforts dus à la mise sous pression lors du remplissage et maintiennent les portées d'appui des pieds dans un plan sensiblement perpendiculaire à l'axe du récipient. Cette solution n'est pas toujours satisfaisante. Sous l'effet d'une pression interne, les fonds pétaloïdes peuvent éclater. Les fonds pétaloïdes ne peuvent pas toujours encaisser la surpression due à l'augmentation de volume du contenu de la bouteille, lors d'une pasteurisation.It has been proposed to make the containers with petaloid bottoms. The bottom wall is then generally convex outward and has feet, typically four to six feet formed by excrescences regularly distributed on the bottom, and separated in pairs by a portion of the convex bottom wall. These petaloid bottoms are widely used for containers containing carbonated beverages. The radial recesses separating the feet absorb the forces due to the pressurization during filling and maintain the bearing surfaces of the feet in a plane substantially perpendicular to the axis of the container. This solution is not always satisfactory. Under the effect of internal pressure, the petaloid bottoms may burst. The petaloid bottoms can not always withstand the overpressure due to the increase in volume of the contents of the bottle, during a pasteurization.

Il a été aussi proposé de réaliser des bouteilles à fond rainuré, le cas échéant de type « champagne » nervuré. Le document FR 2 717 443 décrit une bouteille dans laquelle les nervures partent de la périphérie du fond et aboutissent à la limite extérieure d'une zone annulaire sensiblement plane entourant une partie centrale concave amorphe. Le document FR 2 753 435 de la demanderesse décrit un récipient dont le fond comprend une partie centrale non étirée et une partie périphérique reliant la partie centrale à la paroi latérale du récipient, ce fond étant pourvu de nervures s'étendant de la paroi latérale jusqu'à la limite extrême théorique de la partie centrale non étirée. Cette limite extrême théorique tient compte des légères fluctuations de la forme et des dimensions de la partie centrale du fond (pastille), d'une bouteille à l'autre d'une même série. Aucune nervure ne s'achève dans la partie amorphe.It has also been proposed to produce bottles with a grooved bottom, where appropriate of the "champagne" ribbed type. The document FR 2,717,443 describes a bottle in which the ribs depart from the periphery of the bottom and end at the outer limit of a substantially flat annular zone surrounding an amorphous concave central portion. The document FR 2,753,435 of the applicant describes a container whose bottom comprises a central portion unstretched and a peripheral portion connecting the central portion to the side wall of the container, the bottom being provided with ribs extending from the side wall to the theoretical end limit of the unstretched central portion. This theoretical extreme limit takes into account the slight fluctuations in the shape and dimensions of the central part of the bottom (pellet), from one bottle to another of the same series. No rib ends in the amorphous part.

Il s'avère que si les fonds de l'art antérieur résolvent certains seulement des problèmes posés, aucun n'est capable, après une chute et une déformation subséquente, de recouvrer sa forme initiale, qu'il soit rempli ou non.It turns out that if the funds of the prior art solve only some of the problems posed, none is able, after a fall and a subsequent deformation, to recover its original shape, whether it is filled or not.

L'invention vise à fournir une nouvelle structure de fond de bouteille dont l'ensemble des caractéristiques individuelles permette d'obtenir une résistance supérieure à celle de la plupart des fonds actuellement connus, et lui permette de recouvrer "naturellement" sa forme après une contrainte (chute ou autre) ayant provoqué sa déformation.The aim of the invention is to provide a new bottle bottom structure whose set of individual characteristics makes it possible to obtain a resistance greater than that of most of the funds currently known, and enables it to recover "naturally" its shape after a constraint. (fall or other) having caused its deformation.

A épaisseur de paroi identique, un fond selon l'invention sera plus résistant que la plupart des fonds de bouteille connus antérieurement.At identical wall thickness, a bottom according to the invention will be more resistant than most previously known bottoms bottoms.

A résistance souhaitée, un fond selon l'invention pourra être réalisé avec une épaisseur de matière moindre que la plupart des fonds connus antérieurement.A desired strength, a bottom according to the invention can be made with a material thickness less than most funds previously known.

L'invention vise également à fournir une bouteille présentant une bonne résistance au remplissage à chaud et une bonne résistance à la pasteurisation.The invention also aims to provide a bottle having good resistance to hot filling and good resistance to pasteurization.

L'invention se rapporte, selon premier aspect, à un fond de corps avec les caractéristiques de la revendication 1.The invention relates, in a first aspect, to a body base with the features of claim 1.

Selon diverses réalisations, le fond de corps creux présente les caractéristiques suivantes, le cas échéant combinées :

  • les nervures de renfort n'atteignent pas le bord externe du fond ;
  • au moins une nervure présente un plan de symétrie vertical ;
  • les deux ailes latérales de chaque nervure pourvue d'un plan de symétrie sont sensiblement en regard l'une de l'autre en partie extrême distale de ces nervures, et notamment au voisinage de leur bord extérieur ;
  • la pastille de matériau à faible cristallinité est en saillie en face externe dans la partie centrale transversale. Cette disposition assure un écartement entre les nervures de renfort et cette pastille ;
  • le bord externe est placé à une hauteur h5 par rapport à la surface d'appui transversale, la partie centrale transversale étant placée à une hauteur h10 par rapport à la surface d'appui transversale ;
According to various embodiments, the hollow body bottom has the following characteristics, if necessary combined:
  • the reinforcing ribs do not reach the outer edge of the bottom;
  • at least one rib has a vertical plane of symmetry;
  • the two lateral wings of each rib provided with a plane of symmetry are substantially facing each other at the distal end portion of these ribs, and in particular in the vicinity of their outer edge;
  • the pellet of low crystallinity material is projecting on the outer face in the transverse central part. This arrangement ensures a spacing between the reinforcing ribs and this pellet;
  • the outer edge is placed at a height h5 with respect to the transverse bearing surface, the transverse central portion being placed at a height h10 with respect to the transverse bearing surface;

Dans une réalisation avantageuse, à l'exception des nervures de renfort, le fond se présente sous la forme d'un corps de révolution autour d'un axe sensiblement perpendiculaire à sa surface d'appui transversale.In an advantageous embodiment, with the exception of the reinforcing ribs, the bottom is in the form of a body of revolution about an axis substantially perpendicular to its transverse bearing surface.

Dans un mode de réalisation avantageux, le fond présente, en coupe radiale verticale, entre le bord externe et la surface d'appui transversale, un profil qui est :

  • au voisinage du bord externe, sensiblement tangent à une direction perpendiculaire à la surface d'appui transversale,
  • au voisinage de la surface d'appui transversale, sensiblement tangent à cette surface d'appui transversale.
In an advantageous embodiment, the bottom has, in vertical radial section, between the outer edge and the transverse bearing surface, a profile which is:
  • in the vicinity of the outer edge, substantially tangent to a direction perpendicular to the transverse bearing surface,
  • in the vicinity of the transverse bearing surface, substantially tangential to the transverse bearing surface.

Avantageusement, le fond présente, en coupe radiale verticale, entre le bord externe et la surface d'appui transversale, un profil sensiblement parabolique.Advantageously, the bottom has, in vertical radial section, between the outer edge and the transverse support surface, a substantially parabolic profile.

Avantageusement, le fond présente une surface d'appui transversale de forme annulaire. Partant de cette surface annulaire et se dirigeant vers l'axe de révolution, le fond présente avantageusement tout d'abord une marche annulaire, puis un profil sensiblement parabolique reliant cette marche à la partie centrale transversale.Advantageously, the bottom has a transverse bearing surface of annular shape. Starting from this annular surface and moving towards the axis of revolution, the bottom preferably has first an annular step, then a substantially parabolic profile connecting this step to the central transverse portion.

L'invention se rapporte, selon un deuxième aspect à un corps creux en matériau thermoplastique, notamment polyester tel que PET, obtenu par soufflage ou étirage soufflage d'une préforme, ce corps creux comprenant une paroi latérale et un fond raccordé à cette paroi latérale, ledit fond étant tel que présenté ci-dessus.The invention relates, in a second aspect to a hollow body of thermoplastic material, in particular polyester such as PET, obtained by blow molding or stretch blow molding of a preform, this hollow body comprising a side wall and a bottom connected to this side wall said bottom being as presented above.

D'autres objets et avantages de l'invention apparaîtront au cours de la description suivante de modes de réalisation, donnés à titre d'exemples non limitatifs, cette description étant effectuée à la lumière des dessins annexés, dans lesquels :

  • la figure 1 est une vue de dessous d'un fond de corps creux tel que par exemple une bouteille, selon un mode de réalisation de l'invention ;
  • la figure 2 est une vue latérale du fond représenté en figure 1 ;
  • la figure 3 est une vue en perspective du fond représenté en figures 1 et 2.
Other objects and advantages of the invention will emerge during the following description of embodiments, given by way of non-limiting examples, this description being made in the light of the appended drawings, in which:
  • the figure 1 is a bottom view of a hollow body bottom such as for example a bottle, according to one embodiment of the invention;
  • the figure 2 is a side view of the bottom represented in figure 1 ;
  • the figure 3 is a perspective view of the bottom represented in Figures 1 and 2 .

A l'exception de six nervures 1 radiales de renfort, le fond 2 se présente sous la forme d'un corps de révolution autour d'un axe 3 sensiblement perpendiculaire à sa surface d'appui transversale 4.With the exception of six radial reinforcing ribs 1, the bottom 2 is in the form of a body of revolution about an axis 3 substantially perpendicular to its transverse support surface 4.

Pour cette raison et afin de simplification, le fond 2 va tout d'abord être décrit en faisant abstraction des nervures 1 radiales, ces nervures 1 radiales faisant l'objet ensuite d'une description détaillée.For this reason and for simplicity, the bottom 2 will first be described in isolation from the radial ribs 1, these radial ribs 1 being then described in detail.

Le fond 2 va être décrit en partant de son bord externe 5 et en allant radialement vers l'axe 3 de révolution.The bottom 2 will be described starting from its outer edge 5 and going radially towards the axis 3 of revolution.

Le bord externe 5 est transversal et correspond sensiblement à la jonction entre le fond 2 et la paroi latérale du récipient (non représentée). Ce bord externe 5 est placé à une hauteur h5 par rapport à la surface d'appui transversale 4 du fond 2 (et de la bouteille comprenant ce fond 2, lorsque cette bouteille est stockée debout).The outer edge 5 is transverse and substantially corresponds to the junction between the bottom 2 and the side wall of the container (not shown). This outer edge 5 is placed at a height h5 relative to the transverse bearing surface 4 of the bottom 2 (and the bottle comprising the bottom 2, when the bottle is stored standing).

Entre le bord externe 5 et la surface d'appui transversale 4, le fond présente en coupe radiale verticale un profil sensiblement parabolique. Au voisinage du bord externe 5, ce profil 6 est sensiblement tangent à une direction 7 perpendiculaire à la surface d'appui transversale 4. Au voisinage de la surface d'appui transversale 4, ce profil 6 est sensiblement tangent à cette surface d'appui transversale 4. Le profil 6 assure ainsi une solution de continuité, sans rupture de courbure, entre la paroi latérale du récipient (non représentée) et la surface d'appui transversale 4.Between the outer edge 5 and the transverse support surface 4, the bottom has in vertical radial section a substantially parabolic profile. In the vicinity of the outer edge 5, this profile 6 is substantially tangential to a direction 7 perpendicular to the transverse bearing surface 4. In the vicinity of the transverse bearing surface 4, this profile 6 is substantially tangential to the transverse bearing surface 4. The profile 6 thus provides a solution of continuity, without rupture of curvature, between the side wall of the container (not shown) and the transverse bearing surface 4.

Le fond 2 présente une surface d'appui transversale 4 de forme annulaire. Partant de cette surface d'appui transversale 4 et se dirigeant vers l'axe 3 de révolution, le fond 2 présente une marche 8 annulaire de largeur (mesurée radialement) sensiblement égale à la largeur de la surface annulaire d'appui transversale 4. Cette marche 8 annulaire permet la déformation du fond 2 à la manière d'un soufflet, sous l'effet d'une surpression ou d'un vide dans le corps creux pourvu d'un tel fond.The bottom 2 has a transverse bearing surface 4 of annular shape. Starting from this transverse bearing surface 4 and moving towards the axis 3 of revolution, the bottom 2 has an annular step 8 of width (measured radially) substantially equal to the width of the annular transverse bearing surface 4. 8 annular step allows the deformation of the bottom 2 in the manner of a bellows, under the effect of an overpressure or vacuum in the hollow body provided with such a bottom.

Partant de cette marche 8 annulaire et allant vers l'axe 3 de révolution, le fond 2 présente ensuite, en coupe radiale verticale, un profil 9 sensiblement parabolique puis une partie centrale transversale 10.Starting from this annular step 8 and going towards the axis 3 of revolution, the bottom 2 then has, in vertical radial section, a substantially parabolic profile 9 and then a transverse central portion 10.

La partie centrale transversale 10 est placée à une hauteur h 10 par rapport à la surface d'appui transversale 4, cette hauteur h10 étant supérieure à celle h5 du bord externe 5.The transverse central portion 10 is placed at a height h 10 relative to the transverse bearing surface 4, this height h10 being greater than that h5 of the outer edge 5.

Une pastille 11 axiale est en saillie dans la partie centrale transversale 10, cette pastille 11 axiale saillant vers le bas, c'est-à-dire l'extérieur du récipient pourvu du fond 2.An axial pellet 11 protrudes into the transverse central portion 10, this pellet 11 axially projecting downwards, that is to say the outside of the container provided with the bottom 2.

Les nervures radiales de renfort vont maintenant être décrites.The radial reinforcing ribs will now be described.

Ces nervures 1 radiales ont un bord extérieur 12 venant à proximité du bord externe 5 du fond 2. Comme illustré, de préférence, le bord extérieur 12 des nervures radiales 1 n'atteint pas ce bord externe 5 du fond 2, bien que ceci soit parfaitement envisageable et ne change en rien les qualités du fond ; il est même possible d'alterner des nervures atteignant le bord externe et d'autres pas.These radial ribs 1 have an outer edge 12 coming close to the outer edge 5 of the bottom 2. As illustrated, preferably, the outer edge 12 of the radial ribs 1 does not reach this outer edge 5 of the bottom 2, although this is perfectly conceivable and does not change the qualities of the background; it is even possible to alternate ribs reaching the outer edge and others not.

Ces nervures 1 radiales ont un bord intérieur 13 venant à proximité de la partie centrale transversale 10, mais sans atteindre cette partie centrale transversale 10.These radial ribs 1 have an inner edge 13 coming close to the transverse central portion 10, but without reaching this transverse central portion 10.

Chaque nervure 1 radiale comprend une paroi 14 de fond et une aile 15, 16 de part et d'autre de cette paroi 14 de fond. La paroi 14 de fond est de largeur sensiblement constante sur toute la longueur de nervure. Vue en coupe, chaque nervure 1 radiale présente un plan 17 de symétrie vertical radial et la paroi 14 de fond présente un contour sensiblement identique à celui formé par le profil 6, la surface d'appui transversale 4, et le profil 9. Vue dans un plan perpendiculaire à sa courbure, la paroi 14 de fond est sensiblement plane ou légèrement courbe.Each radial rib 1 comprises a bottom wall 14 and a flange 15, 16 on either side of this bottom wall 14. The bottom wall 14 is substantially constant width over the entire rib length. Sectional view, each radial rib 1 has a plane 17 of radial vertical symmetry and the bottom wall 14 has a substantially identical contour to that formed by the profile 6, the transverse bearing surface 4, and the profile 9. In view in FIG. a plane perpendicular to its curvature, the bottom wall 14 is substantially flat or slightly curved.

Les deux ailes 15, 16 latérales sont sensiblement en regard l'une de l'autre en partie extrême distale des nervures, et notamment au voisinage de leur bord extérieur 12.The two lateral wings 15, 16 are substantially facing one another at the distal end of the ribs, and in particular in the vicinity of their outer edge 12.

Les deux ailes 15, 16 latérales s'écartent l'une de l'autre et les nervures s'évasent de plus en plus lorsque l'on se rapproche de l'axe 3 de révolution. Au voisinage de leur bord intérieur 13, les nervures 1 de renfort ont ainsi une section en U très ouvert, lorsque ces nervures 1 de renfort sont vues dans un plan perpendiculaire à leur paroi 14 de fond.The two wings 15, 16 laterals deviate from one another and the ribs flare more and more as one approaches the axis 3 of revolution. In the vicinity of their inner edge 13, the reinforcement ribs 1 thus have a very open U-shaped section, when these reinforcing ribs 1 are seen in a plane perpendicular to their bottom wall 14.

Les nervures 1 radiales viennent ainsi s'adosser à une cheminée centrale 18 au centre de laquelle saillit, vers le bas, la pastille 11, cette cheminée centrale 18 étant limitée vers le haut par la partie centrale transversale 10.The radial ribs 1 thus come to bear against a central chimney 18 in the center of which protrudes, downwards, the pellet 11, this central chimney 18 being limited upwards by the transverse central portion 10.

L'ensemble des caractéristiques individuelles du fond de bouteille permet d'obtenir une résistance supérieure à celle de la plupart des fonds actuellement connus. A épaisseur de paroi identique, un fond selon l'invention sera plus résistant que la plupart des fonds de bouteille connus antérieurement. A résistance souhaitée, un fond selon l'invention pourra être réalisé avec une épaisseur de matière moindre que la plupart des fonds connus antérieurement.The set of individual characteristics of the bottom of the bottle makes it possible to obtain a resistance greater than that of most currently known funds. At identical wall thickness, a bottom according to the invention will be more resistant than most previously known bottoms bottoms. A desired strength, a bottom according to the invention can be made with a material thickness less than most funds previously known.

Une bouteille comprenant un fond selon l'invention présente une bonne résistance au remplissage à chaud et une bonne résistance à la pasteurisation. La cheminée centrale 18 est particulièrement bien renforcée vis-à-vis du fluage ou de l'affaissement par la présence des nervures 1 de renfort s'évasant depuis leur extrémité distale (où ces nervures ont une section en U à ailes sensiblement parallèles et courtes) jusque vers leur extrémité proximale (où ces nervures ont une section en U très ouvert à ailes plus longues et courbes).A bottle comprising a bottom according to the invention has a good resistance to hot filling and good resistance to pasteurization. The central chimney 18 is particularly well reinforced with respect to creep or slump by the presence of reinforcement ribs 1 flaring from their distal end (where these ribs have a U-shaped section with substantially parallel and short flanges ) to their proximal end (where these ribs have a very open U-section with longer, curved wings).

Une bouteille comprenant un fond selon l'invention présente également une bonne résistance aux chocs sur la partie inférieure de la paroi latérale, les nervures débordant sur cette partie inférieure. Le fond absorbe parfaitement les chocs et est capable de recouvrer "naturellement" sa forme initiale après déformation.A bottle comprising a bottom according to the invention also has good impact resistance on the lower part of the side wall, the ribs projecting over this lower part. The bottom absorbs shocks perfectly and is able to recover "naturally" its initial shape after deformation.

Dans le mode de réalisation représenté, les nervures 1 de renfort sont au nombre de six et sensiblement identiques et équidistantes. Dans d'autres modes de réalisation, les nervures de renfort sont plus ou moins nombreuses, pour tenir compte notamment du diamètre du fond. Les nervures de renfort peuvent être de dimensions différentes, une première série peut présenter une paroi de fond plus étroite que la paroi de fond d'une deuxième série de nervures.In the embodiment shown, the ribs 1 of reinforcement are six in number and substantially identical and equidistant. In other embodiments, the reinforcing ribs are more or less numerous, in particular to take into account the diameter of the bottom. The reinforcing ribs may be of different sizes, a first series may have a bottom wall narrower than the bottom wall of a second series of ribs.

Claims (12)

  1. Bottom (2) of a hollow body obtained by blowing or stretch-blowing a preform made of thermoplastic material, said bottom (2) comprising a transverse support surface (4) and, on either side of said transverse support surface (4):
    - a transverse external edge (5);
    - a concave internal wall with a transverse central portion (10) comprising a pellet (11) of a low-crystallinity material, said pellet (11) corresponding to the injection point of the preform;
    said bottom (2) comprising reinforcing ribs (1) having an outer edge (12) adjacent to the external edge (5) of the bottom (2), said reinforcing ribs (1) having an inner edge (13) adjacent to the transverse central portion (10) but not reaching said transverse central portion (10), characterized in that the reinforcing ribs (1) flare from their outer edge (12) toward their inner edge (13), characterized in that the reinforcing ribs (1) have a bottom wall (14) having a substantially constant width over the entire length of said ribs (1).
  2. Bottom of a hollow body according to claim 1, characterized in that the outer edge (12) of the reinforcing ribs (1) does not reach the external edge (5).
  3. Bottom of a hollow body according to one of claims 1 to 2, characterized in that at least one rib (1) has a vertical plane of symmetry (17).
  4. Bottom of a hollow body according to claim 3, characterized in that the two lateral wings (15, 16) of each reinforcing rib (1) provided with a plane of symmetry are substantially facing one another in the distal end portion of the ribs (1), and particularly in the vicinity of the outer edge (12).
  5. Bottom of a hollow body according to any of claims 1 to 4, characterized in that the pellet (11) made of a low-crystallinity material projects at the external surface in the transverse central portion (10).
  6. Bottom of a hollow body according to any of claims 1 to 5, characterized in that the external edge (5) is placed at a height h5 with respect to the transverse support surface (4), the transverse central portion (10) being placed at a height h10 with respect to the transverse support surface (4).
  7. Bottom of a hollow body according to any of the previous claims, characterized in that, with the exception of the reinforcing ribs (1), the bottom (2) is in the form of a rotating member about an axis (3) that is substantially perpendicular to its transverse support surface (4).
  8. Bottom of a hollow body according to claim 7, characterized in that it has, at a vertical radial cross-section, between the external edge (5) and the transverse support surface (4), a profile which is:
    - in the vicinity of the external edge (5), substantially tangent to a direction (7) that is perpendicular to the transverse support surface (4),
    - in the vicinity of the transverse support surface (4), substantially tangent to said transverse support surface (4).
  9. Bottom of a hollow body according to claim 8, characterized in that it has, in vertical radial cross-section, between the external edge (5) and the transverse support surface (4), a substantially parabolic profile (6).
  10. Bottom of a hollow body according to claim 8 or 9, characterized in that it has a transverse support surface (4) having an annular shape.
  11. Bottom of a hollow body according to claim 10, characterized in that, starting from said transverse support surface (4) having an annular shape and in the direction of the axis (3) of revolution, the bottom (2) first has an annular step (8), then a substantially parabolic profile (9) connecting said step (8) to the transverse central portion (10).
  12. Hollow body made of thermoplastic material, particularly polyester such as PET, obtained by blowing or stretch-blowing a preform, the hollow body comprising a lateral wall and a bottom connected to the lateral wall, characterized in that said bottom is such as presented in any of the previous claims.
EP07823285A 2006-08-08 2007-07-13 Bottom of a hollow body obtained by blowing or stretch-blowing a preform of a thermoplastic material, and hollow body comprising such a bottom Not-in-force EP2051910B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0607212A FR2904808B1 (en) 2006-08-08 2006-08-08 HOLLOW BODY BASE OBTAINED BY BLOWING OR STRETCH BLOWING A PREFORM IN THERMOPLASTIC MATERIAL, HOLLOW BODIES CONTAINING SUCH A BOTTOM
PCT/FR2007/001207 WO2008017746A2 (en) 2006-08-08 2007-07-13 Bottom of a hollow body obtained by blowing or stretch-blowing a preform of a thermoplastic material, and hollow body comprising such a bottom

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EP2051910A2 EP2051910A2 (en) 2009-04-29
EP2051910B1 true EP2051910B1 (en) 2012-02-15

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US (1) US9302805B2 (en)
EP (1) EP2051910B1 (en)
JP (1) JP2010500241A (en)
CN (1) CN101522532B (en)
AT (1) ATE545592T1 (en)
ES (1) ES2382187T3 (en)
FR (1) FR2904808B1 (en)
MX (1) MX2009001359A (en)
WO (1) WO2008017746A2 (en)

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JP2010500241A (en) 2010-01-07
US20110309090A1 (en) 2011-12-22
WO2008017746A2 (en) 2008-02-14
ATE545592T1 (en) 2012-03-15
CN101522532A (en) 2009-09-02
US9302805B2 (en) 2016-04-05
ES2382187T3 (en) 2012-06-06
CN101522532B (en) 2011-11-16
FR2904808A1 (en) 2008-02-15
EP2051910A2 (en) 2009-04-29
WO2008017746A3 (en) 2008-04-17
FR2904808B1 (en) 2011-03-04
MX2009001359A (en) 2009-06-30

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