EP0673840B1 - Plastic moulded bottle and mould for manufacturing it - Google Patents

Plastic moulded bottle and mould for manufacturing it Download PDF

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Publication number
EP0673840B1
EP0673840B1 EP95400525A EP95400525A EP0673840B1 EP 0673840 B1 EP0673840 B1 EP 0673840B1 EP 95400525 A EP95400525 A EP 95400525A EP 95400525 A EP95400525 A EP 95400525A EP 0673840 B1 EP0673840 B1 EP 0673840B1
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EP
European Patent Office
Prior art keywords
bottle
convex
concave
bottle according
annular surface
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.)
Expired - Lifetime
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EP95400525A
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German (de)
French (fr)
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EP0673840A1 (en
Inventor
Alain Colloud
Jean-Marie Petre
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.)
Societe des Eaux Minerales dEvian SA SAEME
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Societe des Eaux Minerales dEvian SA SAEME
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    • 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
    • B65D2501/00—Containers having bodies formed in one piece
    • B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
    • B65D2501/0018—Ribs
    • B65D2501/0027—Hollow longitudinal ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2501/00—Containers having bodies formed in one piece
    • B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
    • B65D2501/0081—Bottles of non-circular cross-section

Definitions

  • the invention relates to a molded plastic bottle, intended in particular to contain still or non-carbonated water, or another non-carbonated liquid. It also relates to a mold for manufacturing this bottle.
  • Bottles of this type are made of a plastic material such as for example PET (polyethylene terephthalate), PVC (polyvinyl chloride) or the like, by well-known injection-blow molding or extrusion blow molding techniques . They generally include a neck intended to receive a tight closure cap, a cylindrical wall with transverse grooves and a bottom whose shape is designed to give it a certain mechanical resistance.
  • PET polyethylene terephthalate
  • PVC polyvinyl chloride
  • bottles of this type are currently packaged and transported in stacked and palletized loads, so that the bottoms of the bottles of the upper layers of a load rest on the caps of the bottles of the lower layers and are subjected by them to sinking and punching constraints, which can result in ruptures or permanent deformation of the bottoms, by inclinations of the bottles in the load and by defects in the stability of the palletized loads.
  • the object of the invention is in particular to avoid or at least reduce these drawbacks.
  • It relates to a molded plastic bottle whose bottom has improved stability and resistance to sinking.
  • a molded plastic bottle comprising a neck intended to receive a stopper, a substantially cylindrical side wall and a bottom formed with a concave reentrant central part and a convex peripheral surface which comprises radial grooves and which is connected to the concave central part of the bottom by a substantially planar annular surface, the bottoms of the radial grooves being connected substantially tangentially to said planar annular surface.
  • the curvature of a surface is always defined from the inside towards the outside of the bottle, a concave surface therefore having its concavity turned towards the outside of the bottle, a convex surface having its convexity turned towards the outside of the bottle.
  • a bottom of the bottle having the configuration defined above has a resistance to internal overpressures and to punching stresses, as well as a stability, notably superior to what could be obtained in the prior art.
  • the radial width of said planar annular surface is greater than the radius of the concave central part of the bottom of the bottle, and the diameter of this concave central part of the bottom is less than the diameter of the stopper provided on the neck of the bottle.
  • the convex peripheral surface of the bottom is connected to the flat annular surface by a concave annular surface, and to the side wall of the bottle by a convex cylindrical surface whose generator is an arc of circle with a large radius of curvature.
  • the bottoms of the radial grooves formed in the convex peripheral surface are tangentially connected to the connection surface between this planar annular surface and said convex peripheral surface.
  • the bottoms of the radial grooves are connected to the wall of the bottle by concave surfaces.
  • this form of bottom of a molded plastic bottle makes it possible to improve by a factor of 1.5 to 2 the mechanical resistance to sinking and to internal overpressure, and the invention is applicable to bottles with a bottom circular or of another shape, for example substantially rectangular or square, polygonal or other.
  • the invention also provides a mold for manufacturing a bottle of the aforementioned type, this mold comprising a bottom wall formed with a protruding or convex central surface, a concave peripheral surface comprising radial ribs, and a substantially planar annular surface connecting the central surface to the concave peripheral surface, the tops of the radial ribs being connected substantially tangentially to said planar annular surface.
  • the radial width of the planar annular surface of the bottom of the mold is greater than the radius of the projecting central surface of the bottom of the mold.
  • the characteristics of the bottom of the bottle are found, with a shape inversion for the curvatures, on the bottom of the mold.
  • the bottle 10 of FIG. 1 intended to contain still or non-carbonated mineral water, is of conventional shape and is made of a conventional material such as PET (polyethylene terephthalate) by injection-blowing or extrusion -blowing.
  • PET polyethylene terephthalate
  • This bottle essentially comprises a threaded neck 12 intended to receive a screw cap 14 for sealing, a frustoconical upper part 16 connecting the neck 12 to a cylindrical side wall 18 of circular section, and a bottom 20, the cylindrical side wall 18 of the bottle being formed with transverse grooves 22 for stiffening and with a grip neck 24 provided substantially at mid-height.
  • the bottom 20 of the bottle (FIG. 2) has a circular contour and includes a re-entrant central part 26 of concave shape (with a concavity turned towards the outside of the bottle as indicated above) which is connected to the side wall 18 of the bottle by, successively, a flat annular surface 28 and by a convex peripheral surface 30 which forms a bearing surface of the bottle on any support 32, the bottom of the bottle further comprising a concave annular surface 34 of connection between the planar annular surface 28 and the convex peripheral surface 30, and a convex cylindrical surface 36 for connection between said convex peripheral surface 30 and the cylindrical wall 18 of the bottle.
  • Radial grooves 38 are formed in said convex peripheral surface 30, these grooves (which are grooves on the outside of the bottle and which form ribs projecting inside the bottle) being regularly distributed over the periphery of the convex surface 30, their number being between 6 and 20 and preferably being 9, 10 or 11.
  • the bottom profile of the bottle in axial section can be defined as follows, with reference to FIG. 2: the convex cylindrical surface 36 which connects the straight cylindrical wall 18 of the bottle to the convex surface 30 of support on a support, has a generatrix in an arc of a circle whose radius of curvature R1 is relatively large, for example of the order 90 mm when the radius of the cross section of the cylindrical wall 18 is of the order of 45 mm.
  • the profile of the convex surface 30 is an arc of a circle of radius R2, for example of the order of 7 mm in the hypothesis mentioned above, which is tangentially connected to the arc of a circle of radius R1 defining the surface 36 .
  • the circular arc of radius R2 defining the profile of the convex surface 30 is tangentially connected to a circular arc of radius R3 defining the profile of the concave annular surface 34, this radius R3 being of the order of 20 mm in l hypothesis mentioned above.
  • the circular arc of radius R3 defining the profile of the surface 34 is tangentially connected to the planar annular surface 28 which extends perpendicular to the longitudinal axis 40 of the bottle, the distance d between this planar annular surface 28 and the transverse plane tangent to the convex surface 30 being of the order of 3 to 4 mm in the hypothesis mentioned above.
  • the concave central portion 26 of the bottom is defined, in axial section, by a circular arc of radius R4 which is of the order of 9 mm in the hypothesis mentioned above, this concave circular arc of radius R4 being connected to the planar annular surface 28 by a convex annular surface 42 whose profile in axial section is defined by an arc of a circle of radius R5 having a value of the order of 5 mm in the same hypothesis as above.
  • Each radial groove 38 has a V cross section (FIG. 3) with a rounded bottom 44, the side walls 46 of each groove forming an angle between them of the order of 70 ° in the hypothesis mentioned above and being connected to the convex surface 30 by rounded 48 with small radius of curvature (about 1 mm in the hypothesis mentioned above).
  • the number of radial grooves 38 being between 6 and 20, the angle at the center a between the axes of two consecutive grooves is between 60 ° and 18 °.
  • each radial rib can be defined (FIG. 2) by a convex arc of radius R6 tangentially connected to the planar annular surface 28 by a concave arc of radius R7 and connected to the cylindrical surface 36 by a concave circular arc of radius R8 and a convex circular arc of radius R9, the circular arc of radius R9 being tangentially connected to the circular arc of radius R1 of the surface 36 and to the circular arc of radius R8, the latter being itself tangentially connected to the arc of a circle of radius R6.
  • each radial rib is tangentially connected to the planar annular surface 28 of the bottom of the bottle and to the concave annular surface 34 for connection between this planar annular surface 28 and the convex surface 30 bearing on a support 32.
  • the radius R6 can be of the order of 5 mm, the radius R7 of the order of 45 mm, the radius R8 of the order of 5.5 mm and the radius R9 of around 1.5 mm.
  • the concave central part 26 of the bottom of the bottle has a diameter which is considerably less than that of the stopper 14 of the bottle (for example of the order of 18-20 mm when the stopper has a diameter of around 30 mm) and is connected to the flat annular surface 28 whose radial extent or width is advantageously greater than the radius of the concave central part 26 of the bottom.
  • the holding of the bottle during storage is also improved, no deformation in heeling (inclination relative to the vertical) being observed after seven days of storage at 40 ° C.
  • the bottle has a substantially rectangular section with convex curved sides and its bottom 20 has a substantially rectangular curvilinear outline, defined by two large convex sides 50 and two small convex sides 52, connected by rounded or convex arcs of a circle 54.
  • the bottom 20 comprises a concave central reentrant part 26, connected by a planar annular surface 28 to a peripheral surface convex 30 bearing on a support surface, and radial ribs 38 formed in this convex surface 30 and regularly distributed.
  • radial grooves 38 are formed along the diagonals 56 of the bottom 20.
  • the number of grooves is advantageously between 12 and 16 (it is 14 in the example shown), and may vary between 8 or 10 and 20 depending on the shape and dimensions of the bottom.
  • FIG. 6 schematically shows a partial view in axial section of a mold for manufacturing a bottle according to the invention, such as that of FIGS. 1 to 3.
  • the mold 60 comprises a bottom wall 62, the internal face of which comprises a projecting central surface 64 of convex shape, a concave peripheral surface 66 comprising regularly distributed radial ribs 68, and a substantially planar annular surface 70 which connects the convex central surface 64 to the concave peripheral surface 66, the latter being connected to the internal peripheral surface 72 of the mold.
  • the shapes of the internal face of the bottom of the mold correspond to those of the bottom of the bottle of FIGS. 1 to 3, with an inversion for the curvatures, the concave surfaces of the bottom of the mold corresponding to convex surfaces of the bottom of the bottle, and vice versa, and the radial ribs 68 of the bottom of the mold corresponding to the radial grooves 38 of the bottom of the bottle.

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

A moulded plastic bottle, with a reinforced base, has a concave centre section (26) leading into a flat ring surface (28) to the convex peripheral rim (30) to rest on the flat supporting surface (32) to hold the bottle. Radial grooves (38) are shaped in the peripheral rim surface (30), running at a tangent to the flat ring surface (28). The plastic is e.g. PET or PVC, for injection or blow moulding. Also claimed is a mould with the required structure to impose the base shape and construction.

Description

L'invention concerne une bouteille moulée en matière plastique, destinée en particulier à contenir de l'eau plate ou non gazeuse, ou un autre liquide non gazéifié. Elle concerne également un moule de fabrication de cette bouteille.The invention relates to a molded plastic bottle, intended in particular to contain still or non-carbonated water, or another non-carbonated liquid. It also relates to a mold for manufacturing this bottle.

Les bouteilles de ce type sont réalisées en une matière plastique telle par exemple que du PET (polytéréphtalate d'éthylène), du PVC (polychlorure de vinyle) ou autre, par des techniques bien connues d'injection-soufflage ou d'extrusion-soufflage. Elles comportent en général un goulot destiné à recevoir un bouchon de fermeture étanche, une paroi cylindrique à cannelures transversales et un fond dont la forme est conçue pour lui conférer une certaine résistance mécanique.Bottles of this type are made of a plastic material such as for example PET (polyethylene terephthalate), PVC (polyvinyl chloride) or the like, by well-known injection-blow molding or extrusion blow molding techniques . They generally include a neck intended to receive a tight closure cap, a cylindrical wall with transverse grooves and a bottom whose shape is designed to give it a certain mechanical resistance.

Il est notamment connu de former dans le fond d'une bouteille de ce type, une partie centrale rentrante bombée qui est raccordée à la paroi latérale cylindrique de la bouteille par une surface annulaire convexe d'appui au sol comportant des nervures ou des rainures radiales de rigidification (comme décrit par exemple dans les Brevets Français 2 219 077 et 2 300 707).It is in particular known to form in the bottom of a bottle of this type, a domed re-entrant central part which is connected to the cylindrical side wall of the bottle by a convex annular surface for bearing on the ground comprising ribs or radial grooves. stiffening (as described for example in French Patents 2,219,077 and 2,300,707).

Cependant, ces fonds constituent toujours le point faible des bouteilles. En particulier, des essais de chute verticale de bouteilles pleines révèlent des taux de casse ou de rupture du fond de l'ordre de 70% pour des bouteilles en PVC tombant sur leur fond d'une hauteur d'un mètre.However, these funds are still the weak point of the bottles. In particular, vertical drop tests of full bottles reveal rates of breakage or rupture of the bottom of the order of 70% for PVC bottles falling on their bottom from a height of one meter.

Un autre inconvénient de ces fonds connus est leur faible résistance à une surpression interne, qui peut résulter d'une augmentation de la température de stockage des bouteilles pleines et/ou d'un retrait de la matière plastique des bouteilles au cours des deux ou trois semaines suivant leur fabrication et leur remplissage. La surpression interne dans une bouteille bouchée hermétiquement se traduit par une déformation du fond et un défaut de stabilité de la bouteille.Another drawback of these known bottoms is their low resistance to internal overpressure, which can result from an increase in the storage temperature of the full bottles and / or a withdrawal of the plastic from the bottles during the two or three weeks following their manufacture and filling. Internal overpressure in a corked bottle hermetically results in a deformation of the bottom and a lack of stability of the bottle.

En outre, les bouteilles de ce type sont actuellement conditionnées et transportées en charges gerbées et palettisées, de sorte que les fonds des bouteilles des couches supérieures d'une charge reposent sur les bouchons des bouteilles des couches inférieures et sont soumis par ces derniers à des contraintes d'enfoncement et de poinçonnement, qui peuvent se traduire par des ruptures ou des déformations permanentes des fonds, par des inclinaisons des bouteilles dans la charge et par des défauts de stabilité des charges palettisées.In addition, bottles of this type are currently packaged and transported in stacked and palletized loads, so that the bottoms of the bottles of the upper layers of a load rest on the caps of the bottles of the lower layers and are subjected by them to sinking and punching constraints, which can result in ruptures or permanent deformation of the bottoms, by inclinations of the bottles in the load and by defects in the stability of the palletized loads.

L'invention a notamment pour but d'éviter ou au moins de réduire ces inconvénients.The object of the invention is in particular to avoid or at least reduce these drawbacks.

Elle a pour objet une bouteille moulée en matière plastique dont le fond présente une stabilité et une résistance à l'enfoncement améliorées.It relates to a molded plastic bottle whose bottom has improved stability and resistance to sinking.

Elle propose à cet effet une bouteille moulée en matière plastique comprenant un goulot destiné à recevoir un bouchon, une paroi latérale sensiblement cylindrique et un fond formé avec une partie centrale rentrante concave et une surface périphérique convexe qui comprend des rainures radiales et qui est raccordée à la partie centrale concave du fond par une surface annulaire sensiblement plane, les fonds des rainures radiales étant raccordées sensiblement tangentiellement à ladite surface annulaire plane.To this end, it offers a molded plastic bottle comprising a neck intended to receive a stopper, a substantially cylindrical side wall and a bottom formed with a concave reentrant central part and a convex peripheral surface which comprises radial grooves and which is connected to the concave central part of the bottom by a substantially planar annular surface, the bottoms of the radial grooves being connected substantially tangentially to said planar annular surface.

Dans la présente description, la courbure d'une surface est toujours définie de l'intérieur vers l'extérieur de la bouteille, une surface concave ayant donc sa concavité tournée vers l'extérieur de la bouteille, une surface convexe ayant sa convexité tournée vers l'extérieur de la bouteille.In the present description, the curvature of a surface is always defined from the inside towards the outside of the bottle, a concave surface therefore having its concavity turned towards the outside of the bottle, a convex surface having its convexity turned towards the outside of the bottle.

De façon surprenante, on a constaté qu'un fond de bouteille présentant la configuration définie ci-dessus a une résistance aux surpressions internes et aux contraintes de poinçonnement, ainsi qu'une stabilité, notablement supérieures à ce que l'on pouvait obtenir dans la technique antérieure.Surprisingly, it has been found that a bottom of the bottle having the configuration defined above has a resistance to internal overpressures and to punching stresses, as well as a stability, notably superior to what could be obtained in the prior art.

C'est notamment grâce au raccordement tangentiel des rainures à la surface plane du fond que l'on peut empêcher ou réduire considérablement les déformations du fond sous l'effet des variations de pression dans la bouteille, et donc garantir sa stabilité.It is in particular thanks to the tangential connection of the grooves to the flat surface of the bottom that it is possible to prevent or considerably reduce the deformations of the bottom under the effect of pressure variations in the bottle, and therefore guarantee its stability.

Avantageusement, la largeur radiale de ladite surface annulaire plane est supérieure au rayon de la partie centrale concave du fond de la bouteille, et le diamètre de cette partie centrale concave du fond est inférieur au diamètre du bouchon prévu sur le goulot de la bouteille.Advantageously, the radial width of said planar annular surface is greater than the radius of the concave central part of the bottom of the bottle, and the diameter of this concave central part of the bottom is less than the diameter of the stopper provided on the neck of the bottle.

Dans un mode de réalisation préféré de l'invention, la surface périphérique convexe du fond est raccordée à la surface annulaire plane par une surface annulaire concave, et à la paroi latérale de la bouteille par une surface cylindrique convexe dont la génératrice est un arc de cercle à grand rayon de courbure.In a preferred embodiment of the invention, the convex peripheral surface of the bottom is connected to the flat annular surface by a concave annular surface, and to the side wall of the bottle by a convex cylindrical surface whose generator is an arc of circle with a large radius of curvature.

A une extrémité, les fonds des rainures radiales formées dans la surface périphérique convexe sont raccordés tangentiellement à la surface de raccordement entre cette surface annulaire plane et ladite surface périphérique convexe.At one end, the bottoms of the radial grooves formed in the convex peripheral surface are tangentially connected to the connection surface between this planar annular surface and said convex peripheral surface.

A leur autre extrémité, les fonds des rainures radiales sont raccordés à la paroi de la bouteille par des surfaces concaves.At their other end, the bottoms of the radial grooves are connected to the wall of the bottle by concave surfaces.

De façon générale, cette forme de fond de bouteille moulée en matière plastique permet d'améliorer d'un facteur 1,5 à 2 la résistance mécanique à l'enfoncement et à la surpression interne, et l'invention est applicable aux bouteilles à fond circulaire ou d'une autre forme, par exemple sensiblement rectangulaire ou carrée, polygonale ou autre.In general, this form of bottom of a molded plastic bottle makes it possible to improve by a factor of 1.5 to 2 the mechanical resistance to sinking and to internal overpressure, and the invention is applicable to bottles with a bottom circular or of another shape, for example substantially rectangular or square, polygonal or other.

L'invention propose également un moule de fabrication d'une bouteille du type précité, ce moule comprenant une paroi de fond formée avec une surface centrale saillante ou convexe, une surface périphérique concave comportant des nervures radiales, et une surface annulaire sensiblement plane raccordant la surface centrale à la surface périphérique concave, les sommets des nervures radiales étant raccordés sensiblement tangentiellement à ladite surface annulaire plane.The invention also provides a mold for manufacturing a bottle of the aforementioned type, this mold comprising a bottom wall formed with a protruding or convex central surface, a concave peripheral surface comprising radial ribs, and a substantially planar annular surface connecting the central surface to the concave peripheral surface, the tops of the radial ribs being connected substantially tangentially to said planar annular surface.

De préférence, la largeur radiale de la surface annulaire plane du fond du moule est supérieure au rayon de la surface centrale saillante du fond du moule.Preferably, the radial width of the planar annular surface of the bottom of the mold is greater than the radius of the projecting central surface of the bottom of the mold.

De façon générale, les caractéristiques du fond de la bouteille se retrouvent, avec une inversion de forme pour les courbures, sur le fond du moule.In general, the characteristics of the bottom of the bottle are found, with a shape inversion for the curvatures, on the bottom of the mold.

L'invention sera mieux comprise et d'autres caractéristiques, détails et avantages de celle-ci apparaitront plus clairement à la lecture de la description qui suit, faite à titre d'exemple en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une vue schématique en élévation d'une bouteille en matière plastique à laquelle l'invention est applicable;
  • la figure 2 est une demi-vue schématique en coupe axiale du fond de cette bouteille, représenté à plus grande échelle;
  • la figure 3 est une vue partielle en coupe selon la ligne III-III de la figure 2;
  • les figures 4 et 5 sont des vues schématiques en élévation et de dessous du fond d'une bouteille à section sensiblement rectangulaire;
  • la figure 6 est une vue schématique partielle en coupe axiale d'un moule de fabrication d'une bouteille selon l'invention.
The invention will be better understood and other characteristics, details and advantages thereof will appear more clearly on reading the following description, given by way of example with reference to the appended drawings, in which:
  • Figure 1 is a schematic elevational view of a plastic bottle to which the invention is applicable;
  • Figure 2 is a schematic half-view in axial section of the bottom of this bottle, shown on a larger scale;
  • Figure 3 is a partial sectional view along line III-III of Figure 2;
  • Figures 4 and 5 are schematic views in elevation and from below the bottom of a bottle with a substantially rectangular section;
  • Figure 6 is a partial schematic view in axial section of a mold for manufacturing a bottle according to the invention.

La bouteille 10 de la figure 1, destinée à contenir de l'eau minérale plate ou non gazeuse, est de forme classique et est réalisée en une matière classique telle que du PET (poly-téréphtalate d'éthylène) par injection-soufflage ou extrusion-soufflage.The bottle 10 of FIG. 1, intended to contain still or non-carbonated mineral water, is of conventional shape and is made of a conventional material such as PET (polyethylene terephthalate) by injection-blowing or extrusion -blowing.

Cette bouteille comprend essentiellement un goulot fileté 12 destiné à recevoir un bouchon vissé 14 de fermeture étanche, une partie supérieure 16 tronconique reliant le goulot 12 à une paroi latérale cylindrique 18 à section circulaire, et un fond 20, la paroi latérale cylindrique 18 de la bouteille étant formée avec des cannelures transversales 22 de rigidification et avec un rétreint de préhension 24 prévu sensiblement à mi-hauteur.This bottle essentially comprises a threaded neck 12 intended to receive a screw cap 14 for sealing, a frustoconical upper part 16 connecting the neck 12 to a cylindrical side wall 18 of circular section, and a bottom 20, the cylindrical side wall 18 of the bottle being formed with transverse grooves 22 for stiffening and with a grip neck 24 provided substantially at mid-height.

Le fond 20 de la bouteille (figure 2) est à contour circulaire et comprend une partie centrale rentrante 26 de forme concave (à concavité tournée vers l'extérieur de la bouteille comme indiqué plus haut) qui est raccordée à la paroi latérale 18 de la bouteille par, successivement, une surface annulaire plane 28 et par une surface périphérique convexe 30 qui forme une surface d'appui de la bouteille sur un support quelconque 32, le fond de la bouteille comprenant en outre une surface annulaire concave 34 de raccordement entre la surface annulaire plane 28 et la surface périphérique convexe 30, et une surface cylindrique 36 convexe de raccordement entre ladite surface périphérique convexe 30 et la paroi cylindrique 18 de la bouteille.The bottom 20 of the bottle (FIG. 2) has a circular contour and includes a re-entrant central part 26 of concave shape (with a concavity turned towards the outside of the bottle as indicated above) which is connected to the side wall 18 of the bottle by, successively, a flat annular surface 28 and by a convex peripheral surface 30 which forms a bearing surface of the bottle on any support 32, the bottom of the bottle further comprising a concave annular surface 34 of connection between the planar annular surface 28 and the convex peripheral surface 30, and a convex cylindrical surface 36 for connection between said convex peripheral surface 30 and the cylindrical wall 18 of the bottle.

Des rainures radiales 38 sont formées dans ladite surface périphérique convexe 30, ces rainures (qui sont des rainures à l'extérieur de la bouteille et qui forment des nervures en saillie à l'intérieur de la bouteille) étant régulièrement réparties sur la périphérie de la surface convexe 30, leur nombre étant compris entre 6 et 20 et étant de préférence de 9, 10 ou 11.Radial grooves 38 are formed in said convex peripheral surface 30, these grooves (which are grooves on the outside of the bottle and which form ribs projecting inside the bottle) being regularly distributed over the periphery of the convex surface 30, their number being between 6 and 20 and preferably being 9, 10 or 11.

De façon plus précise, le profil du fond de la bouteille en coupe axiale peut être défini comme suit, en référence à la figure 2 :
   la surface cylindrique convexe 36 qui relie la paroi cylindrique droite 18 de la bouteille à la surface convexe 30 d'appui sur un support, a une génératrice en arc de cercle dont le rayon de courbure R1 est relativement important, par exemple de l'ordre de 90 mm quand le rayon de la section droite de la paroi cylindrique 18 est de l'ordre de 45 mm.More precisely, the bottom profile of the bottle in axial section can be defined as follows, with reference to FIG. 2:
the convex cylindrical surface 36 which connects the straight cylindrical wall 18 of the bottle to the convex surface 30 of support on a support, has a generatrix in an arc of a circle whose radius of curvature R1 is relatively large, for example of the order 90 mm when the radius of the cross section of the cylindrical wall 18 is of the order of 45 mm.

Le profil de la surface convexe 30 est un arc de cercle de rayon R2, par exemple de l'ordre de 7 mm dans l'hypothèse évoquée plus haut, qui est raccordé tangentiellement à l'arc de cercle de rayon R1 définissant la surface 36.The profile of the convex surface 30 is an arc of a circle of radius R2, for example of the order of 7 mm in the hypothesis mentioned above, which is tangentially connected to the arc of a circle of radius R1 defining the surface 36 .

L'arc de cercle de rayon R2 définissant le profil de la surface convexe 30 est raccordé tangentiellement à un arc de cercle de rayon R3 définissant le profil de la surface annulaire concave 34, ce rayon R3 étant de l'ordre de 20 mm dans l'hypothèse évoquée plus haut.The circular arc of radius R2 defining the profile of the convex surface 30 is tangentially connected to a circular arc of radius R3 defining the profile of the concave annular surface 34, this radius R3 being of the order of 20 mm in l hypothesis mentioned above.

L'arc de cercle de rayon R3 définissant le profil de la surface 34 est raccordé tangentiellement à la surface annulaire plane 28 qui s'étend perpendiculairement à l'axe longitudinal 40 de la bouteille, la distance d entre cette surface annulaire plane 28 et le plan transversal tangent à la surface convexe 30 étant de l'ordre de 3 à 4 mm dans l'hypothèse évoquée plus haut.The circular arc of radius R3 defining the profile of the surface 34 is tangentially connected to the planar annular surface 28 which extends perpendicular to the longitudinal axis 40 of the bottle, the distance d between this planar annular surface 28 and the transverse plane tangent to the convex surface 30 being of the order of 3 to 4 mm in the hypothesis mentioned above.

La partie centrale concave 26 du fond est définie, en coupe axiale, par un arc de cercle de rayon R4 qui est de l'ordre de 9 mm dans l'hypothèse évoquée plus haut, cet arc de cercle concave de rayon R4 étant raccordé à la surface annulaire plane 28 par une surface annulaire convexe 42 dont le profil en section axiale est défini par un arc de cercle de rayon R5 ayant une valeur de l'ordre de 5 mm dans la même hypothèse que précédemment.The concave central portion 26 of the bottom is defined, in axial section, by a circular arc of radius R4 which is of the order of 9 mm in the hypothesis mentioned above, this concave circular arc of radius R4 being connected to the planar annular surface 28 by a convex annular surface 42 whose profile in axial section is defined by an arc of a circle of radius R5 having a value of the order of 5 mm in the same hypothesis as above.

Chaque rainure radiale 38 est à section transversale en V (figure 3) à fond arrondi 44, les parois latérales 46 de chaque rainure faisant entre elles un angle de l'ordre de 70° dans l'hypothèse évoquée plus haut et étant raccordées à la surface convexe 30 par des arrondis 48 à faible rayon de courbure (d'environ 1 mm dans l'hypothèse évoquée plus haut).Each radial groove 38 has a V cross section (FIG. 3) with a rounded bottom 44, the side walls 46 of each groove forming an angle between them of the order of 70 ° in the hypothesis mentioned above and being connected to the convex surface 30 by rounded 48 with small radius of curvature (about 1 mm in the hypothesis mentioned above).

Le nombre des rainures radiales 38 étant compris entre 6 et 20, l'angle au centre a entre les axes de deux rainures consécutives est compris entre 60° et 18°.The number of radial grooves 38 being between 6 and 20, the angle at the center a between the axes of two consecutive grooves is between 60 ° and 18 °.

Le profil du fond 44 de chaque nervure radiale peut être défini (figure 2) par un arc de cercle convexe de rayon R6 raccordé tangentiellement à la surface annulaire plane 28 par un arc de cercle concave de rayon R7 et raccordé à la surface cylindrique 36 par un arc de cercle concave de rayon R8 et un arc de cercle convexe de rayon R9, l'arc de cercle de rayon R9 étant raccordé tangentiellement à l'arc de cercle de rayon R1 de la surface 36 et à l'arc de cercle de rayon R8, ce dernier étant lui-même raccordé tangentiellement à l'arc de cercle de rayon R6.The bottom profile 44 of each radial rib can be defined (FIG. 2) by a convex arc of radius R6 tangentially connected to the planar annular surface 28 by a concave arc of radius R7 and connected to the cylindrical surface 36 by a concave circular arc of radius R8 and a convex circular arc of radius R9, the circular arc of radius R9 being tangentially connected to the circular arc of radius R1 of the surface 36 and to the circular arc of radius R8, the latter being itself tangentially connected to the arc of a circle of radius R6.

Le fond 44 de chaque nervure radiale est raccordé tangentiellement à la surface annulaire plane 28 du fond de la bouteille et à la surface annulaire concave 34 de raccordement entre cette surface annulaire plane 28 et la surface convexe 30 d'appui sur un support 32.The bottom 44 of each radial rib is tangentially connected to the planar annular surface 28 of the bottom of the bottle and to the concave annular surface 34 for connection between this planar annular surface 28 and the convex surface 30 bearing on a support 32.

C'est grâce à ce raccordement tangentiel des fonds des rainures 38 à la surface annulaire plane 28 que l'on peut empêcher des déformations du fond vers le haut ou vers le bas sous l'effet des variations de pression dans une bouteille pleine et bouchée, et que l'on peut maintenir la partie plane 28 du fond à une distance d sensiblement constante de la surface d'appui 32 de la bouteille (les variations de pression dues au retrait de la matière ou aux variations de température étant inférieures à 0,5 bar pour une bouteille contenant de l'eau plate), cette distance restant sensiblement la même que la bouteille soit vide ou pleine.It is thanks to this tangential connection of the bottoms of the grooves 38 to the planar annular surface 28 that it is possible to prevent deformations of the bottom upwards or downwards under the effect of pressure variations in a full and corked bottle. , and that the flat part 28 of the bottom can be maintained at a substantially constant distance d from the bearing surface 32 of the bottle (the pressure variations due to the shrinkage of the material or the temperature variations being less than 0 , 5 bar for a bottle containing water flat), this distance remaining substantially the same whether the bottle is empty or full.

Dans l'hypothèse chiffrée évoquée plus haut, le rayon R6 peut être de l'ordre de 5 mm, le rayon R7 de l'ordre de 45 mm, le rayon R8 de l'ordre de 5,5 mm et le rayon R9 de l'ordre de 1,5 mm.In the numerical hypothesis mentioned above, the radius R6 can be of the order of 5 mm, the radius R7 of the order of 45 mm, the radius R8 of the order of 5.5 mm and the radius R9 of around 1.5 mm.

La partie centrale concave 26 du fond de la bouteille a un diamètre assez nettement inférieur à celui du bouchon 14 de la bouteille (par exemple de l'ordre de 18-20 mm quand le bouchon a un diamètre de l'ordre de 30 mm) et est raccordée à la surface annulaire plane 28 dont l'étendue ou largeur radiale est avantageusement supérieure au rayon de la partie centrale concave 26 du fond.The concave central part 26 of the bottom of the bottle has a diameter which is considerably less than that of the stopper 14 of the bottle (for example of the order of 18-20 mm when the stopper has a diameter of around 30 mm) and is connected to the flat annular surface 28 whose radial extent or width is advantageously greater than the radius of the concave central part 26 of the bottom.

La résistance du fond de la bouteille aux contraintes de poinçonnement dans le cas d'une charge gerbée et palettisée en est largement accrue. Il en résulte que la stabilité de la charge gerbée et palettisée en est améliorée.The resistance of the bottom of the bottle to punching constraints in the case of a stacked and palletized load is greatly increased. As a result, the stability of the stacked and palletized load is improved.

La tenue de la bouteille au stockage est également améliorée, aucune déformation en gîte (inclinaison par rapport à la verticale) n'étant constatée après sept jours de stockage à 40°C.The holding of the bottle during storage is also improved, no deformation in heeling (inclination relative to the vertical) being observed after seven days of storage at 40 ° C.

En outre, aucune rupture du fond n'a été constatée lors des essais de chutes verticales sur une hauteur d'un mètre (bouteilles en PET remplies d'eau plate et fermées hermétiquement).In addition, no rupture of the bottom was noted during the vertical drop tests over a height of one meter (PET bottles filled with plain water and hermetically closed).

Dans la forme de réalisation des figures 4 et 5, la bouteille est à section sensiblement rectangulaire à côtés incurvés convexes et son fond 20 est à contour sensiblement rectangulaire curviligne, défini par deux grands côtés 50 convexes et deux petits côtés 52 convexes, raccordés par des arrondis ou arcs de cercle convexes 54.In the embodiment of FIGS. 4 and 5, the bottle has a substantially rectangular section with convex curved sides and its bottom 20 has a substantially rectangular curvilinear outline, defined by two large convex sides 50 and two small convex sides 52, connected by rounded or convex arcs of a circle 54.

Comme précédemment, le fond 20 comprend une partie centrale concave rentrante 26, raccordée par une surface annulaire plane 28 à une surface périphérique convexe 30 d'appui sur une surface de support, et des nervures radiales 38 formées dans cette surface convexe 30 et régulièrement réparties.As before, the bottom 20 comprises a concave central reentrant part 26, connected by a planar annular surface 28 to a peripheral surface convex 30 bearing on a support surface, and radial ribs 38 formed in this convex surface 30 and regularly distributed.

Comme on le voit bien en figure 5, des rainures radiales 38 sont formées le long des diagonales 56 du fond 20. Le nombre de rainures est avantageusement compris entre 12 et 16 (il est de 14 dans l'exemple représenté), et peut varier entre 8 ou 10 et 20 en fonction de la forme et des dimensions du fond.As can be clearly seen in FIG. 5, radial grooves 38 are formed along the diagonals 56 of the bottom 20. The number of grooves is advantageously between 12 and 16 (it is 14 in the example shown), and may vary between 8 or 10 and 20 depending on the shape and dimensions of the bottom.

Pour le reste, les caractéristiques du fond de la bouteille des figures 4 et 5 sont les mêmes que celles déjà décrites de la bouteille des figures 1 à 3.For the rest, the characteristics of the bottom of the bottle of FIGS. 4 and 5 are the same as those already described of the bottle of FIGS. 1 to 3.

On a représenté schématiquement en figure 6 une vue partielle en coupe axiale d'un moule de fabrication d'une bouteille selon l'invention, telle que celle des figures 1 à 3.FIG. 6 schematically shows a partial view in axial section of a mold for manufacturing a bottle according to the invention, such as that of FIGS. 1 to 3.

Le moule 60 comprend une paroi de fond 62 dont la face interne comprend une surface centrale saillante 64 de forme convexe, une surface périphérique concave 66 comportant des nervures radiales 68 régulièrement réparties, et une surface annulaire sensiblement plane 70 qui relie la surface centrale convexe 64 à la surface périphérique concave 66, celle-ci étant raccordée à la surface périphérique interne 72 du moule.The mold 60 comprises a bottom wall 62, the internal face of which comprises a projecting central surface 64 of convex shape, a concave peripheral surface 66 comprising regularly distributed radial ribs 68, and a substantially planar annular surface 70 which connects the convex central surface 64 to the concave peripheral surface 66, the latter being connected to the internal peripheral surface 72 of the mold.

De façon générale, les formes de la face interne du fond de moule correspondent à celles du fond de la bouteille des figures 1 à 3, avec une inversion pour les courbures, les surfaces concaves du fond du moule correspondant à des surfaces convexes du fond de la bouteille, et inversement, et les nervures radiales 68 du fond du moule correspondant aux rainures radiales 38 du fond de la bouteille.Generally, the shapes of the internal face of the bottom of the mold correspond to those of the bottom of the bottle of FIGS. 1 to 3, with an inversion for the curvatures, the concave surfaces of the bottom of the mold corresponding to convex surfaces of the bottom of the bottle, and vice versa, and the radial ribs 68 of the bottom of the mold corresponding to the radial grooves 38 of the bottom of the bottle.

Claims (15)

  1. A molded plastics bottle, comprising a neck (12) designed to receive a top (14), a substantially cylindrical side wall (18), and a bottom (20) formed with a concave or indented central portion (26) and a convex peripheral surface (30) which includes radial grooves (38) and which connects with the concave central portion (26) of the bottom via a substantially plane annular surface (28), the bottom (44) of each radial groove (38) connecting substantially tangentially with said plane annular surface (28).
  2. A bottle according to claim 1, characterized in that the radial width of said plane annular surface (28) is greater than the radius of the concave central portion (26) of the bottom.
  3. A bottle according to claim 1 or 2, characterized in that the diameter of the concave central portion (26) of the bottom is smaller than the diameter of the top (14) for screwing onto the neck of the bottle.
  4. A bottle according to any preceding claim, characterized in that the convex peripheral surface (30) of the bottom connects with the plane annular surface (28) via a concave annular surface (34).
  5. A bottle according to any preceding claim, characterized in that the convex peripheral surface (30) of the bottom connects with the side wall (18) via a convex cylindrical surface (36) whose generator line is a circular arc having a large radius of curvature.
  6. A bottle according to any preceding claim, characterized in that the bottom (44) of each radial groove (38) formed in the convex peripheral surface (30) connects tangentially with the connecting surface (34) between the plane annular surface (28) of the bottom and the convex peripheral surface (30).
  7. A bottle according to any preceding claim, characterized in that the bottom (44) of each radial groove (38) connects with the side wall (18, 36) of the bottle via a convex surface followed by a concave surface.
  8. A bottle according to any preceding claim, characterized in that the radial grooves (38) have a V-shaped cross-section.
  9. A bottle according to any preceding claim, characterized in that the profile of the bottom (44) of each radial groove (38) comprises a convex circular arc connecting via a concave circular arc with the plane annular surface (28) of the bottom of the bottle and via a convex circular arc followed by a concave circular arc with the side wall of the bottle.
  10. A bottle according to any preceding claim, characterized in that its bottom (20) has a circular outline and the number of radial grooves (38) lies in the range 6 to 20, and is in particular 9, 10 or 11.
  11. A bottle according to any one of claims 1 to 9, characterized in that its bottom (20) has a substantially polygonal outline, e.g. square or rectangular and comprises evenly spaced radial grooves (38).
  12. A bottle according to claim 11, characterized in that the radial grooves (38) extend along the diagonals (56) of the bottom.
  13. A bottle according to claim 11 or 12, characterized in that the number of radial grooves (38) lies in the range 8 to 20 or 10 to 20, and in particular in the range 12 to 16.
  14. A bottle according to any preceding claim, characterized in that, when it is full, said plane annular surface (28) remains at substantially the same axial distance (d) from the bottom of the convex peripheral surface (30) as when the bottle is empty.
  15. A mold for making a bottle according to any preceding claim, comprising a bottom wall (62) formed with a convex or projecting central surface (64), a concave peripheral surface (66) including radial ribs (68) and a plane annular surface (70) connecting the central surface (64) to the concave peripheral surface (66), the top of the radial ribs (68) connecting substantially tangentially with said plane annular surface (70).
EP95400525A 1994-03-16 1995-03-13 Plastic moulded bottle and mould for manufacturing it Expired - Lifetime EP0673840B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9403045 1994-03-16
FR9403045A FR2717443B1 (en) 1994-03-16 1994-03-16 Plastic molded bottle.

Publications (2)

Publication Number Publication Date
EP0673840A1 EP0673840A1 (en) 1995-09-27
EP0673840B1 true EP0673840B1 (en) 1997-05-21

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US (1) US5713480A (en)
EP (1) EP0673840B1 (en)
JP (1) JPH09510168A (en)
AT (1) ATE153295T1 (en)
CA (1) CA2184390A1 (en)
DE (1) DE69500307T2 (en)
FR (1) FR2717443B1 (en)
WO (1) WO1995025041A1 (en)

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CA2184390A1 (en) 1995-09-21
US5713480A (en) 1998-02-03
EP0673840A1 (en) 1995-09-27
FR2717443A1 (en) 1995-09-22
JPH09510168A (en) 1997-10-14
WO1995025041A1 (en) 1995-09-21
ATE153295T1 (en) 1997-06-15
DE69500307T2 (en) 1997-12-18
FR2717443B1 (en) 1996-04-19
DE69500307D1 (en) 1997-06-26

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