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EP1645515A1 - Thermoplastic material container - Google Patents

Thermoplastic material container Download PDF

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Publication number
EP1645515A1
EP1645515A1 EP04292359A EP04292359A EP1645515A1 EP 1645515 A1 EP1645515 A1 EP 1645515A1 EP 04292359 A EP04292359 A EP 04292359A EP 04292359 A EP04292359 A EP 04292359A EP 1645515 A1 EP1645515 A1 EP 1645515A1
Authority
EP
European Patent Office
Prior art keywords
groove
container according
edges
container
curved
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
EP04292359A
Other languages
German (de)
French (fr)
Other versions
EP1645515B1 (en
Inventor
Mikael Derrien
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 SA
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
Priority to ES04292359T priority Critical patent/ES2298697T3/en
Application filed by Sidel SA, Sidel Participations SAS filed Critical Sidel SA
Priority to PT04292359T priority patent/PT1645515E/en
Priority to DE602004010814T priority patent/DE602004010814T2/en
Priority to AT04292359T priority patent/ATE381490T1/en
Priority to EP04292359A priority patent/EP1645515B1/en
Priority to MX2007004132A priority patent/MX2007004132A/en
Priority to PCT/FR2005/002392 priority patent/WO2006037872A1/en
Priority to US11/664,598 priority patent/US7703618B2/en
Priority to CNA2005800387441A priority patent/CN101056798A/en
Publication of EP1645515A1 publication Critical patent/EP1645515A1/en
Application granted granted Critical
Publication of EP1645515B1 publication Critical patent/EP1645515B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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—Rigid or semi-rigid 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 or 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
    • 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—Rigid or semi-rigid 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 or 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

Definitions

  • the present invention relates to improvements made to the containers, in particular bottles, of thermoplastic material manufactured by blow molding or stretch-blow molding of a heated preform, and more specifically to those of these containers which are intended to contain a flat liquid and which have a substantially curved bottom concavity facing outward defining a substantially planar peripheral annular seat for their support on a support, said bottom being provided with a plurality of flutes radiating from the center.
  • a significant part of the energy consumption used for the operation of a container manufacturing plant of the type referred to is used for the production of air under pressure (high pressure of the order of 40x10 5 Pa for blowing, average pressure pre-blowing) and research is currently on machines arranged to blow containers under a significantly lower pressure, for example of the order of 20 to 25x10 5 Pa, together with blowing rates as high as possible.
  • the object of the invention is therefore essentially to provide containers of an improved design which can be blown at a high speed under a relatively low pressure, such as for example 20 to 25x10 5 Pa, while being formed in a correct manner, including in their parts. complex shapes such as the portions of the grooves of the bottom combining with the bottom seat.
  • a container as mentioned in the preamble is characterized, being arranged according to the invention, in that each groove, in its region of intersection of the annular seat, has a portion of substantially increased width and in that that the two edges of this portion of the groove are curved with curvatures of relatively large radii and respective concavities turned towards one another.
  • the presence of the portion of substantially increased width provides the flow of softened thermoplastic material space necessary for its evolution during the blowing process.
  • This flow of thermoplastic material can thus follow its natural path in a controlled manner, so that the previous malformations resulting from the difficulties encountered by the flow of material in its expansion are avoided. It thus becomes possible to obtain, with a lower blowing pressure applied during a short period of time, containers whose bottom has a correct conformation even in its parts of complex shapes. It is thus possible to envisage lower blowing pressures of 30 to 40% (for example typically of the order of 20 to 25x10 5 Pa) with respect to the blowing pressures usually used (by typically of the order of 40x10 5 Pa), and this with a high rate of blowing.
  • the greater ease of expansion offered to the flow of material during blowing makes it possible to treat a less softened material than traditionally, in other words a material brought to a lower temperature, for example less than 5 to 20% of the temperature usually practiced.
  • the best results due to the arrangement according to the invention are obtained when the outer end of the region of increased width extends to the bottom of the heel.
  • the two curved edges delimiting the portion of increased width approach each other progressively at an acute angle.
  • the portion of each groove adjoining, on the side of the center of the bottom the aforesaid portion of increased width has edges substantially rectilinear and substantially parallel. But the best results seem to be obtained when the portion of each groove adjacent to the center of the bottom, the said portion of increased width has a variable width and that its edges are curved with respective convexities turned towards one of the 'other.
  • edges of the portion adjoining, on the side of the center of the bottom, the aforesaid widened portion to be connected continuously and without angular points to the edges. respective portions of the enlarged portion.
  • each groove has a substantially constant depth from its central origin to approximately the seat, then a lesser depth in its maximum width part, and finally a progressively decreasing depth in its end portion on the heel. the bottom.
  • the dimensional ratio between the widest part and the narrowest part of each groove is between 1.5 and 2.5, preferably about 2.
  • the arrangements according to the invention can be applied in all kinds of containers, especially bottles, made of thermoplastic material suitable for containing a flat liquid, especially for bottles intended to contain flat table water.
  • the bottom of the container is generally round in shape (the container being of cylindrical general shape of revolution) and the grooves then extend radially.
  • the provisions of the invention relate exclusively to containers for containing flat liquids (i.e., non-carbonated liquids), and more specifically, although not exclusively, bottles for containing water. flat, especially for drinking.
  • flat liquids i.e., non-carbonated liquids
  • FIGS. 1 to 3 is partially shown a container 1, here a bottle of thermoplastic material such as PET manufactured by blow molding or stretch-blow molding of a preform previously heated to the softening temperature of the thermoplastic material.
  • the bottle has a body 2 (partially visible only) connected below a bottom 3.
  • the bottom 3 is substantially curved with a concavity turned towards the outside as it is is better seen in Figures 1 and 3 and it defines a ring seat 4 (here circular) substantially flat for the stable support of the bottle on a support 7.
  • the bottom 3 is provided with flutes 5 which radiate here radially from a central recess 6 and mechanically stiffen the bottom 3 so that the seat 4 remains flat despite the weight of the column of liquid that overcomes the bottom 3.
  • each groove 5, in its region of intersection with the seat 4 has a portion 8 of substantially increased width defined by a curvilinear contour.
  • the outer end of said portion 8 increased width extends to the heel 9 of the bottom 3 (the term of heel designating the raised portion of the bottom 3 which makes the connection with the body 2).
  • the two edges defining this portion 8 of the groove 5 are curved with curvatures of relatively large radii and respective concavities facing one another; advantageously, these two curved edges are approaching each other externally at an acute angle.
  • the portion of each groove adjoining the side of the center of the bottom, the aforesaid portion 8 increased width has substantially straight edges and substantially parallel, in other words, has a current conformation.
  • the portion 11 of each groove 5 adjoining on the side of the center of the bottom, the aforesaid 8 portion with increased width has a variable width and that its edges 12 are curved with respective convexities turned in the direction of one another.
  • the edges 12 of the portion 11 adjoining, on the side of the center of the bottom, the aforesaid enlarged portion 8 are connected continuously and without angular points with the respective edges 10 of the enlarged portion 8 .
  • Each groove 5 then has a continuously curvilinear contour.
  • the dimensional ratio between the widest part and the narrowest part of each groove 5 is between 1.5 and 2.5, and is typically about 2.
  • each groove 5 has a substantially constant depth p 1 from its central origin to the vicinity of the seat 4, then a slightly smaller depth p 2 in its portion of maximum width in correspondence with the seat 4, and finally a depth p 3 gradually decreasing in its end portion on the heel 9 of the bottom 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Table Devices Or Equipment (AREA)

Abstract

Récipient, notamment bouteille, en matériau thermoplastique fabriqué par soufflage ou étirage-soufflage d'une préforme chauffée, ce récipient (1) étant destiné à contenir un liquide plat et possédant un fond (3) sensiblement bombé à concavité tournée vers l'extérieur définissant une assise (4) annulaire périphérique sensiblement plane pour son appui sur un support (7), ledit fond (3) étant muni de plusieurs cannelures (5) rayonnant à partir du centre du fond,
caractérisé en ce que chaque cannelure (5), dans sa région d'intersection de l'assise (4) annulaire, possède une portion (8) de largeur sensiblement accrue et en ce que les deux bords (10) de cette portion de la cannelure sont courbes avec des courbures de relativement grands rayons et à concavités respectives tournées l'une vers l'autre.

Figure imgaf001
Container, in particular a bottle, made of thermoplastic material manufactured by blow-molding or stretch-blow molding of a heated preform, this container (1) being intended to contain a flat liquid and having a bottom (3) substantially convex with concavity facing outwards defining a substantially flat peripheral annular seat (4) for its support on a support (7), said base (3) being provided with a plurality of grooves (5) radiating from the center of the bottom,
characterized in that each groove (5), in its region of intersection of the annular seat (4), has a portion (8) of substantially increased width and in that the two edges (10) of this portion of the groove are curved with curvatures of relatively large radii and respective concavities turned towards each other.
Figure imgaf001

Description

La présente invention concerne des perfectionnements apportés aux récipients, notamment aux bouteilles, en matériau thermoplastique fabriqués par soufflage ou étirage-soufflage d'une préforme chauffée, et plus spécifiquement à ceux de ces récipients qui sont destinés à contenir un liquide plat et qui possèdent un fond sensiblement bombé à concavité tournée vers l'extérieur définissant une assise annulaire périphérique sensiblement plane pour leur appui sur un support, ledit fond étant muni de plusieurs cannelures rayonnant à partir du centre.The present invention relates to improvements made to the containers, in particular bottles, of thermoplastic material manufactured by blow molding or stretch-blow molding of a heated preform, and more specifically to those of these containers which are intended to contain a flat liquid and which have a substantially curved bottom concavity facing outward defining a substantially planar peripheral annular seat for their support on a support, said bottom being provided with a plurality of flutes radiating from the center.

Les fabricants expriment le souhait permanent de produire de tels récipients dans les conditions les plus économiques possibles, c'est-à-dire avec une consommation minimale d'énergie (énergie électrique essentiellement), d'air comprimé et avec des cadences de production accrues, ainsi qu'avec une quantité minimale de matière première.The manufacturers express the permanent desire to produce such containers under the most economical conditions possible, that is to say with minimal consumption of energy (mainly electrical energy), compressed air and with increased production rates. as well as with a minimal amount of raw material.

La mise en oeuvre d'une moindre quantité de matière première conduit à des récipients dont les parois sont très peu épaisses et qu'il est nécessaire de renforcer mécaniquement par des cannelures. Il en est ainsi également du fond qui non seulement est réalisé bombé à concavité tournée vers l'extérieur, mais doit en outre être renforcé par des cannelures ou reliefs d'autres formes qui, généralement, sont d'étendue rayonnante, notamment radiale pour des récipients de forme générale ronde. Au surplus, pour procurer un renforcement mécanique de l'assise du fond et assurer son indéformabilité afin qu'elle demeure sensiblement plane, il est connu que certaines au moins des cannelures rayonnantes du fond débordent sur le talon du fond (c'est-à-dire sur la partie périphérique du fond qui se relève pour assurer la jonction avec le corps du récipient), lesdites cannelures entaillant alors l'assise.The implementation of a smaller amount of raw material leads to containers whose walls are very thin and it is necessary to mechanically reinforce by splines. This is also true of the bottom, which is not only curved with concavity facing outwards, but must also be reinforced by grooves or reliefs of other shapes which, generally, are of radiating extent, in particular radial for containers of round general shape. Moreover, to provide a mechanical reinforcement of the base of the bottom and ensure its non-deformability so that it remains substantially flat, it is known that at least some of the radiating grooves of the bottom overflow on the heel of the bottom (ie say on the part peripheral of the bottom which is raised to ensure the junction with the body of the container), said grooves then notching the seat.

Une part importante de la consommation d'énergie utilisée pour le fonctionnement d'une installation de fabrication de récipients du type visé est employée à la production d'air sous pression (haute pression de l'ordre de 40x105 Pa pour le soufflage, moyenne pression le présoufflage) et les recherches portent actuellement sur des machines agencées pour souffler des récipients sous une pression notablement plus faible, par exemple de l'ordre de 20 à 25x105 Pa, conjointement avec des cadences de soufflage aussi élevées que possible.A significant part of the energy consumption used for the operation of a container manufacturing plant of the type referred to is used for the production of air under pressure (high pressure of the order of 40x10 5 Pa for blowing, average pressure pre-blowing) and research is currently on machines arranged to blow containers under a significantly lower pressure, for example of the order of 20 to 25x10 5 Pa, together with blowing rates as high as possible.

Or une basse pression de soufflage telle qu'il vient d'en être fait mention permet certes de conformer correctement la matière thermoplastique dans les parties de formes simples du récipient final, mais se révèle insuffisante pour systématiquement conformer correctement les parties de formes complexes. Il en est ainsi en particulier de l'assise du fond dans laquelle les cannelures présentent une double courbure (courbure transversale de la cannelure, courbure de la cannelure dans son étendue rayonnante pour le franchissement de l'assise) qui se combine avec la forme générale curviligne de l'assise (qui est ronde dans un récipient généralement cylindrique de révolution). Il peut donc apparaître une malformation de la cannelure au franchissement de l'assise (par exemple les bords de la cannelure tendent à s'écarter l'un de l'autre, éventuellement en combinaison avec une forme irrégulière d'un bord ou des deux bords).However, a low blowing pressure as just mentioned makes it possible to correctly conform the thermoplastic material in the simple shape portions of the final container, but is insufficient to systematically correctly shape the complex shape parts. This is particularly the case of the base in which the grooves have a double curvature (transverse curvature of the groove, curvature of the groove in its radiating extent for the crossing of the seat) which combines with the general shape curvilinear of the seat (which is round in a generally cylindrical container of revolution). It may therefore appear a malformation of the groove to the crossing of the seat (for example the edges of the groove tend to deviate from each other, possibly in combination with an irregular shape of an edge or both edges).

Certains fabricants n'acceptent pas de telles malformations, même si celles-ci n'affectent pas la stabilité des récipients et bien que, étant situées sur le fond des récipients, elles demeurent pratiquement invisibles pour les utilisateurs des récipients.Some manufacturers do not accept such malformations, even if they do not affect the stability of the containers and although, being located on the bottom of the containers, they remain virtually invisible to the users of the containers.

L'invention a donc essentiellement pour objet de proposer des récipients de conception perfectionnée qui peuvent être soufflés à grande cadence sous une pression relativement basse, telle que par exemple 20 à 25x105 Pa, tout en étant formés de façon correcte y compris dans leurs parties de formes complexes telles que les portions des cannelures du fond se combinant avec l'assise du fond.The object of the invention is therefore essentially to provide containers of an improved design which can be blown at a high speed under a relatively low pressure, such as for example 20 to 25x10 5 Pa, while being formed in a correct manner, including in their parts. complex shapes such as the portions of the grooves of the bottom combining with the bottom seat.

A ces fins, un récipient tel que mentionné au préambule se caractérise, étant agencé conformément à l'invention, en ce que chaque cannelure, dans sa région d'intersection de l'assise annulaire, possède une portion de largeur sensiblement accrue et en ce que les deux bords de cette portion de la cannelure sont courbes avec des courbures de relativement grands rayons et à concavités respectives tournées l'une vers l'autre.For these purposes, a container as mentioned in the preamble is characterized, being arranged according to the invention, in that each groove, in its region of intersection of the annular seat, has a portion of substantially increased width and in that that the two edges of this portion of the groove are curved with curvatures of relatively large radii and respective concavities turned towards one another.

Grâce à cette disposition, la présence de la portion de largeur sensiblement accrue procure au flux de matière thermoplastique ramollie l'espace nécessaire à son évolution lors du processus de soufflage. Ce flux de matière thermoplastique peut ainsi suivre son parcours naturel de façon contrôlée, de sorte que se trouvent évitées les malformations antérieures résultant des difficultés rencontrées par le flux de matière dans son expansion. Il devient ainsi possible d'obtenir, avec une pression de soufflage moindre appliquée pendant un intervalle de temps bref, des récipients dont le fond présente une conformation correcte même dans ses parties de formes complexes. Il est ainsi permis d'envisager des pressions de soufflage moindre de 30 à 40% (par exemple typiquement de l'ordre de 20 à 25x105 Pa) par rapport aux pressions de soufflage habituellement pratiquées (par exemple typiquement de l'ordre de 40x105 Pa), et ceci avec une cadence de soufflage élevée.Thanks to this arrangement, the presence of the portion of substantially increased width provides the flow of softened thermoplastic material space necessary for its evolution during the blowing process. This flow of thermoplastic material can thus follow its natural path in a controlled manner, so that the previous malformations resulting from the difficulties encountered by the flow of material in its expansion are avoided. It thus becomes possible to obtain, with a lower blowing pressure applied during a short period of time, containers whose bottom has a correct conformation even in its parts of complex shapes. It is thus possible to envisage lower blowing pressures of 30 to 40% (for example typically of the order of 20 to 25x10 5 Pa) with respect to the blowing pressures usually used (by typically of the order of 40x10 5 Pa), and this with a high rate of blowing.

Au surplus, la plus grande facilité d'expansion offerte au flux de matière lors du soufflage autorise de traiter une matière moins ramollie que traditionnellement, autrement dit une matière portée à une température moindre, par exemple inférieure de 5 à 20% à la température habituellement pratiquée.Moreover, the greater ease of expansion offered to the flow of material during blowing makes it possible to treat a less softened material than traditionally, in other words a material brought to a lower temperature, for example less than 5 to 20% of the temperature usually practiced.

Dans ces conditions, la mise en oeuvre des dispositions conformes à l'invention peut entraîner des économies énergétiques, et donc financières significatives.Under these conditions, the implementation of the provisions of the invention can lead to energy savings, and therefore significant financial.

En outre, s'agissant d'une conformation particulière donnée à des cannelures qui de toute façon sont présentes sur le fond des récipients, le surcoût dû à la mise en oeuvre de l'invention reste modique.In addition, for a particular conformation given splines which anyway are present on the bottom of the containers, the additional cost due to the implementation of the invention remains low.

De préférence, les meilleurs résultats dus à l'agencement conforme à l'invention sont obtenus lorsque l'extrémité externe de la région à largeur accrue s'étend jusque sur le talon du fond.Preferably, the best results due to the arrangement according to the invention are obtained when the outer end of the region of increased width extends to the bottom of the heel.

Dans un exemple de réalisation de l'invention, les deux bords courbes délimitant la portion de largeur accrue se rapprochent l'un de l'autre progressivement sous un angle aigu.In an exemplary embodiment of the invention, the two curved edges delimiting the portion of increased width approach each other progressively at an acute angle.

On peut faire en sorte que la portion de chaque cannelure jouxtant, du côté du centre du fond, la susdite portion de largeur accrue possède des bords sensiblement rectilignes et sensiblement parallèles. Mais les meilleurs résultats semblent devoir être obtenus lorsque la portion de chaque cannelure jouxtant, du côté du centre du fond, la susdite portion de largeur accrue possède une largeur variable et que ses bords sont courbes à convexités respectives tournées en direction l'une de l'autre.It is possible for the portion of each groove adjoining, on the side of the center of the bottom, the aforesaid portion of increased width has edges substantially rectilinear and substantially parallel. But the best results seem to be obtained when the portion of each groove adjacent to the center of the bottom, the said portion of increased width has a variable width and that its edges are curved with respective convexities turned towards one of the 'other.

Toujours en vue d'optimiser les résultats procurés par les dispositions conformes à l'invention, il est souhaitable que les bords de la portion jouxtant, du côté du centre du fond, la susdite portion élargie se raccordent continûment et sans point anguleux avec les bords respectifs de la portion élargie.Still with a view to optimizing the results provided by the arrangements according to the invention, it is desirable for the edges of the portion adjoining, on the side of the center of the bottom, the aforesaid widened portion to be connected continuously and without angular points to the edges. respective portions of the enlarged portion.

Dans un exemple concret de réalisation, chaque cannelure possède une profondeur sensiblement constante depuis son origine centrale jusqu'à approximativement l'assise, puis une profondeur moindre dans sa partie de largeur maximale, et enfin une profondeur progressivement décroissante dans sa partie terminale sur le talon du fond.In a concrete embodiment, each groove has a substantially constant depth from its central origin to approximately the seat, then a lesser depth in its maximum width part, and finally a progressively decreasing depth in its end portion on the heel. the bottom.

De façon préférée en pratique, le rapport dimensionnel entre la partie la plus large et la partie la plus étroite de chaque cannelure est compris entre 1,5 et 2,5, préférentiellement d'environ 2.In a preferred manner in practice, the dimensional ratio between the widest part and the narrowest part of each groove is between 1.5 and 2.5, preferably about 2.

Les dispositions conformes à l'invention peuvent trouver application dans toutes sortes de récipients, notamment des bouteilles, en matière thermoplastique appropriés pour contenir un liquide plat, notamment pour des bouteilles destinées à contenir de l'eau de table plate. En particulier, dans un cas très courant, le fond du récipient est de forme générale ronde (le récipient étant de forme générale cylindrique de révolution) et les cannelures s'étendent alors radialement.The arrangements according to the invention can be applied in all kinds of containers, especially bottles, made of thermoplastic material suitable for containing a flat liquid, especially for bottles intended to contain flat table water. In particular, in a very common case, the bottom of the container is generally round in shape (the container being of cylindrical general shape of revolution) and the grooves then extend radially.

On soulignera que les dispositions conformes à l'invention visent préférentiellement toutes les cannelures dont le fond d'un récipient peut être pourvu. Toutefois, au moins pour certaines applications particulières, il est envisageable que seules certaines cannelures soient agencées conformément à l'invention tandis que d'autres, intercalaires, ne le sont pas.It will be emphasized that the arrangements in accordance with the invention are preferably aimed at all flutes whose bottom of a container can be provided. However, at least for some particular applications, it is conceivable that only some grooves are arranged according to the invention while others, interlayers, are not.

L'invention sera mieux comprise à la lecture de la description détaillée qui suit de certains modes de réalisation préférés donnés uniquement à titre d'exemples nullement limitatifs. Dans cette description, on se réfère aux dessins annexés sur lesquels :

  • la figure 1 est une vue en perspective montrant le fond d'un récipient, ici une bouteille, en matériau thermoplastique agencé conformément à un mode de réalisation préféré de l'invention;
  • les figures 2 et 3 sont des vues respectivement de dessous et de côté de la bouteille de la figure 1; et
  • la figure 4 est une vue schématique en coupe selon la ligne IV-IV de la figure 2.
The invention will be better understood on reading the following detailed description of certain preferred embodiments given solely by way of non-limiting examples. In this description, reference is made to the accompanying drawings in which:
  • Figure 1 is a perspective view showing the bottom of a container, here a bottle, of thermoplastic material arranged according to a preferred embodiment of the invention;
  • Figures 2 and 3 are views respectively from below and from the side of the bottle of Figure 1; and
  • FIG. 4 is a diagrammatic sectional view along the line IV - IV of FIG. 2.

Dans la description qui suit, on se réfère plus particulièrement à titre d'exemple à un récipient de forme générale cylindrique de révolution, tel qu'une bouteille, étant entendu cependant que la mise en oeuvre de l'invention n'est pas limitée à ce seul type de récipient et peut concerner des récipients ayant d'autres formes, et notamment une forme polygonale (en particulier carrée ou rectangulaire).In the description which follows, reference is made more particularly by way of example to a generally cylindrical container of revolution, such as a bottle, it being understood however that the implementation of the invention is not limited to this only type of container and may relate to containers having other shapes, and in particular a polygonal shape (in particular square or rectangular).

Il faut également souligner que les dispositions de l'invention concernent exclusivement des récipients devant contenir des liquides plats (c'est-à-dire des liquides non carbonatés), et plus spécifiquement bien que non exclusivement des bouteilles destinées à contenir de l'eau plate, notamment destinée à la boisson.It should also be emphasized that the provisions of the invention relate exclusively to containers for containing flat liquids (i.e., non-carbonated liquids), and more specifically, although not exclusively, bottles for containing water. flat, especially for drinking.

Aux figures 1 à 3 est représenté partiellement un récipient 1, ici une bouteille en matériau thermoplastique tel que le PET fabriquée par soufflage ou étirage-soufflage d'une préforme préalablement chauffée à la température de ramollissement du matériau thermoplastique. La bouteille comporte un corps 2 (visible en partie seulement) se raccordant inférieurement à un fond 3. D'une façon courante pour les bouteilles destinées à contenir des liquides plats, et notamment de l'eau plate, le fond 3 est sensiblement bombé avec une concavité tournée vers l'extérieur comme on le voit mieux sur les figures 1 et 3 et il définit une assise 4 annulaire (ici circulaire) périphérique sensiblement plane pour l'appui stable de la bouteille sur un support 7. Egalement d'une façon courante, le fond 3 est muni de cannelures 5 qui rayonnent, ici radialement, à partir d'un renfoncement central 6 et qui rigidifient mécaniquement le fond 3 de manière que l'assise 4 demeure plane en dépit du poids de la colonne de liquide qui surmonte le fond 3.In FIGS. 1 to 3 is partially shown a container 1, here a bottle of thermoplastic material such as PET manufactured by blow molding or stretch-blow molding of a preform previously heated to the softening temperature of the thermoplastic material. The bottle has a body 2 (partially visible only) connected below a bottom 3. In a common way for bottles intended to contain flat liquids, and in particular flat water, the bottom 3 is substantially curved with a concavity turned towards the outside as it is is better seen in Figures 1 and 3 and it defines a ring seat 4 (here circular) substantially flat for the stable support of the bottle on a support 7. Also in a common way, the bottom 3 is provided with flutes 5 which radiate here radially from a central recess 6 and mechanically stiffen the bottom 3 so that the seat 4 remains flat despite the weight of the column of liquid that overcomes the bottom 3.

Afin d'éviter des malformations des cannelures 5 à leur traversée de l'assise 4, il est prévu, conformément à l'invention, que chaque cannelure 5, dans sa région d'intersection avec l'assise 4, possède une portion 8 de largeur sensiblement accrue définie par un contour curviligne. De préférence, comme visible sur les figures 1 à 3, l'extrémité externe de ladite portion 8 à largeur accrue s'étend jusque sur le talon 9 du fond 3 (le terme de talon désignant la partie relevée du fond 3 qui fait le raccordement avec le corps 2). De plus, les deux bords 10 définissant cette portion 8 de la cannelure 5 sont courbes avec des courbures de relativement grands rayons et à concavités respectives tournées l'une vers l'autre ; avantageusement, ces deux bords 10 courbes se rapprochent extérieurement l'un de l'autre sous un angle aigu.In order to prevent malformations of the splines 5 at their crossing of the seat 4, it is provided, according to the invention, that each groove 5, in its region of intersection with the seat 4, has a portion 8 of substantially increased width defined by a curvilinear contour. Preferably, as shown in Figures 1 to 3, the outer end of said portion 8 increased width extends to the heel 9 of the bottom 3 (the term of heel designating the raised portion of the bottom 3 which makes the connection with the body 2). In addition, the two edges defining this portion 8 of the groove 5 are curved with curvatures of relatively large radii and respective concavities facing one another; advantageously, these two curved edges are approaching each other externally at an acute angle.

Grâce à cet agencement, on crée une zone d'expansion dans laquelle, lors du formage par soufflage ou étirage-soufflage du récipient 1, le flux de matière ramollie en déplacement peut se répandre librement et épouser fidèlement le contour souhaité malgré la double courbure que présente cette région de la cannelure.Thanks to this arrangement, an expansion zone is created in which, during the blow-molding or stretch-blow molding of the container 1, the flux of softened material in displacement can spread freely and to marry faithfully the desired contour despite the double curvature that presents this region of the groove.

Il est possible de prévoir que la portion de chaque cannelure jouxtant, du côté du centre du fond, la susdite portion 8 à largeur accrue possède des bords sensiblement rectilignes et sensiblement parallèles, autrement dit présente une conformation courante.It is possible to provide that the portion of each groove adjoining the side of the center of the bottom, the aforesaid portion 8 increased width has substantially straight edges and substantially parallel, in other words, has a current conformation.

Cependant, pour faciliter le déplacement du flux de matière et améliorer au mieux la conformation de la cannelure dans cette région, il s'est avéré souhaitable qu'en outre, comme illustré aux figures 1 à 3, la portion 11 de chaque cannelure 5 jouxtant, du côté du centre du fond, la susdite portion 8 à largeur accrue possède une largeur variable et que ses bords 12 soient courbes à convexités respectives tournées en direction l'une de l'autre. Dans ce cas, il est préférable de faire en sorte que les bords 12 de la portion 11 jouxtant, du côté du centre du fond, la susdite portion 8 élargie se raccordent continûment et sans point anguleux avec les bords 10 respectifs de la portion 8 élargie. Chaque cannelure 5 possède alors un contour continûment curviligne. Dans l'exemple de réalisation concret visible aux figures 1 et 2, le rapport dimensionnel entre la partie la plus large et la partie la plus étroite de chaque cannelure 5 est compris entre 1,5 et 2,5, et est typiquement d'environ 2.However, to facilitate the movement of the flow of material and improve the conformation of the groove in this region, it has proved desirable that, furthermore, as illustrated in FIGS. 1 to 3, the portion 11 of each groove 5 adjoining on the side of the center of the bottom, the aforesaid 8 portion with increased width has a variable width and that its edges 12 are curved with respective convexities turned in the direction of one another. In this case, it is preferable to ensure that the edges 12 of the portion 11 adjoining, on the side of the center of the bottom, the aforesaid enlarged portion 8 are connected continuously and without angular points with the respective edges 10 of the enlarged portion 8 . Each groove 5 then has a continuously curvilinear contour. In the concrete embodiment shown in FIGS. 1 and 2, the dimensional ratio between the widest part and the narrowest part of each groove 5 is between 1.5 and 2.5, and is typically about 2.

Comme représenté à la figure 4, chaque cannelure 5 possède une profondeur p1 sensiblement constante depuis son origine centrale jusqu'au voisinage de l'assise 4, puis une profondeur p2 légèrement moindre dans sa partie de largeur maximale en correspondance avec l'assise 4, et enfin une profondeur p3 progressivement décroissante dans sa partie terminale sur le talon 9 du fond 3.As represented in FIG. 4, each groove 5 has a substantially constant depth p 1 from its central origin to the vicinity of the seat 4, then a slightly smaller depth p 2 in its portion of maximum width in correspondence with the seat 4, and finally a depth p 3 gradually decreasing in its end portion on the heel 9 of the bottom 3.

Claims (9)

Récipient, notamment bouteille, en matériau thermoplastique fabriqué par soufflage ou étirage-soufflage d'une préforme chauffée, ce récipient (1) étant destiné à contenir un liquide plat et possédant un fond (3) sensiblement bombé à concavité tournée vers l'extérieur définissant une assise (4) annulaire périphérique sensiblement plane pour son appui sur un support (7), ledit fond (3) étant muni de plusieurs cannelures (5) rayonnant à partir du centre du fond, caractérisé en ce que chaque cannelure (5), dans sa région d'intersection de l'assise (4) annulaire, possède une portion (8) de largeur sensiblement accrue et en ce que les deux bords (10) de cette portion de la cannelure sont courbes avec des courbures de relativement grands rayons et à concavités respectives tournées l'une vers l'autre.Container, in particular a bottle, made of thermoplastic material manufactured by blow-molding or stretch-blow molding of a heated preform, this container (1) being intended to contain a flat liquid and having a bottom (3) substantially convex with concavity facing outwards defining a substantially flat peripheral annular seat (4) for its support on a support (7), said base (3) being provided with a plurality of grooves (5) radiating from the center of the bottom, characterized in that each groove (5), in its region of intersection of the annular seat (4), has a portion (8) of substantially increased width and in that the two edges (10) of this portion of the groove are curved with relatively large radius bends and with concavities turned towards each other. Récipient selon la revendication 1, caractérisé en ce que l'extrémité externe de la portion à largeur accrue s'étend jusque sur le talon (9) du fond.Container according to claim 1, characterized in that the outer end of the increased width portion extends to the heel (9) of the bottom. Récipient selon la revendication 1 ou 2, caractérisé en ce que les deux bords (10) courbes se rapprochent extérieurement l'un de l'autre sous un angle aigu.Container according to claim 1 or 2, characterized in that the two curved edges (10) approach each other externally at an acute angle. Récipient selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la portion (11) de chaque cannelure (5) jouxtant, du côté du centre du fond, la susdite portion (8) à largeur accrue possède une largeur variable et en ce que ses bords (12) sont courbes à convexités respectives tournées en direction l'une de l'autre.Container according to any one of claims 1 to 3, characterized in that the portion (11) of each groove (5) adjoining the side of the center of the bottom, the aforesaid portion (8) increased width has a variable width and in that its edges (12) are curved with respective convexities turned in the direction of one another. Récipient selon la revendication 4, caractérisé en ce que les bords (12) de la portion jouxtant, du côté du centre du fond, la susdite portion élargie se raccordent continûment et sans point anguleux avec les bords (10) respectifs de la région élargie.Container according to claim 4, characterized in that the edges (12) of the adjoining portion, on the side from the center of the bottom, the aforesaid widened portion are connected continuously and without angular points with the respective edges (10) of the enlarged region. Récipient selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le rapport dimensionnel entre la partie la plus large et la partie la plus étroite de chaque cannelure (5) est compris entre 1,5 et 2,5.Container according to any one of claims 1 to 5, characterized in that the dimension ratio between the widest part and the narrowest part of each groove (5) is between 1.5 and 2.5. Récipient selon la revendication 6, caractérisé en ce que le rapport dimensionnel est d'environ 2.Container according to claim 6, characterized in that the aspect ratio is about 2. Récipient selon l'une quelconque des revendications 1 à 7, caractérisé en ce que chaque cannelure (5) possède une profondeur (p1) sensiblement constante depuis son origine centrale jusqu'à approximativement l'assise (4), puis une profondeur (p2) moindre dans sa partie de largeur maximale, et enfin une profondeur (p3) progressivement décroissante dans sa partie terminale sur le talon (9) du fond.Container according to any one of claims 1 to 7, characterized in that each groove (5) has a depth (p 1 ) substantially constant from its central origin to approximately the seat (4), then a depth (p 2 ) less in its part of maximum width, and finally a depth (p 3 ) gradually decreasing in its end portion on the heel (9) of the bottom. Récipient selon l'une quelconque des revendications 1 à 8, caractérisé en ce que son fond (3) est de forme générale ronde et en ce que les cannelures (5) s'étendent radialement.Container according to any one of claims 1 to 8, characterized in that its bottom (3) is generally round in shape and in that the flutes (5) extend radially.
EP04292359A 2004-10-05 2004-10-05 Thermoplastic material container Expired - Lifetime EP1645515B1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
PT04292359T PT1645515E (en) 2004-10-05 2004-10-05 Thermoplastic material container
DE602004010814T DE602004010814T2 (en) 2004-10-05 2004-10-05 Container made of thermoplastic material
AT04292359T ATE381490T1 (en) 2004-10-05 2004-10-05 CONTAINER MADE OF THERMOPLASTIC MATERIAL
EP04292359A EP1645515B1 (en) 2004-10-05 2004-10-05 Thermoplastic material container
ES04292359T ES2298697T3 (en) 2004-10-05 2004-10-05 CONTAINER OF THERMOPLASTIC MATERIAL.
CNA2005800387441A CN101056798A (en) 2004-10-05 2005-09-27 Thermoplastic material container
PCT/FR2005/002392 WO2006037872A1 (en) 2004-10-05 2005-09-27 Thermoplastic material container
US11/664,598 US7703618B2 (en) 2004-10-05 2005-09-27 Thermoplastic material container, in particular bottle
MX2007004132A MX2007004132A (en) 2004-10-05 2005-09-27 Thermoplastic material container.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04292359A EP1645515B1 (en) 2004-10-05 2004-10-05 Thermoplastic material container

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EP1645515A1 true EP1645515A1 (en) 2006-04-12
EP1645515B1 EP1645515B1 (en) 2007-12-19

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EP04292359A Expired - Lifetime EP1645515B1 (en) 2004-10-05 2004-10-05 Thermoplastic material container

Country Status (9)

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US (1) US7703618B2 (en)
EP (1) EP1645515B1 (en)
CN (1) CN101056798A (en)
AT (1) ATE381490T1 (en)
DE (1) DE602004010814T2 (en)
ES (1) ES2298697T3 (en)
MX (1) MX2007004132A (en)
PT (1) PT1645515E (en)
WO (1) WO2006037872A1 (en)

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Also Published As

Publication number Publication date
US20080035601A1 (en) 2008-02-14
EP1645515B1 (en) 2007-12-19
WO2006037872A1 (en) 2006-04-13
US7703618B2 (en) 2010-04-27
ES2298697T3 (en) 2008-05-16
CN101056798A (en) 2007-10-17
ATE381490T1 (en) 2008-01-15
PT1645515E (en) 2008-03-27
DE602004010814D1 (en) 2008-01-31
MX2007004132A (en) 2007-10-02
DE602004010814T2 (en) 2008-12-11

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