EP0002082A1 - Hollow body made of oriented thermoplastic material - Google Patents

Hollow body made of oriented thermoplastic material Download PDF

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Publication number
EP0002082A1
EP0002082A1 EP78200288A EP78200288A EP0002082A1 EP 0002082 A1 EP0002082 A1 EP 0002082A1 EP 78200288 A EP78200288 A EP 78200288A EP 78200288 A EP78200288 A EP 78200288A EP 0002082 A1 EP0002082 A1 EP 0002082A1
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EP
European Patent Office
Prior art keywords
hollow body
annular zone
molding
body according
zone
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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
EP78200288A
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German (de)
French (fr)
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EP0002082B1 (en
Inventor
Roger Dechenne
Guy Hubert
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Solvay SA
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Solvay SA
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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
    • B65D1/0276—Bottom construction having a continuous contact surface, e.g. Champagne-type bottom

Definitions

  • the present invention relates to a hollow body of oriented thermoplastic material, the body of which is generally cylindrical in shape and the bottom of which is re-entrant, such as a bottle or similar container.
  • thermoplastic materials for the production of hollow bodies such as bottles for packaging liquids.
  • these hollow bodies In order to increase the mechanical resistance of these hollow bodies, they are more and more blow molded under conditions, particularly of temperature, leading to the orientation and preferably to the biorientation in two orthogonal directions of the macromolecules of their constituent material.
  • the hollow bodies with a recessed bottom have an impact resistance, particularly at the bottom, which often leaves something to be desired.
  • these hollow bodies are poorly resistant to the lateral shocks that they can undergo, during accidental falls or during their transport by rail in particular.
  • the present invention therefore relates to a hollow body of oriented thermoplastic material comprising a neck region, a generally cylindrical side wall, and a re-entrant bottom in which the bottom is formed successively from the periphery by a peripheral arcuate molding for connection. to the side wall, by a substantially planar annular zone connecting to the peripheral arcuate molding, and by a central part in the shape of a re-entrant dome which is connected to the annular zone and whose diameter is less than 40% of the maximum external diameter of the hollow body.
  • the value of the diameter of the central part in the shape of a re-entrant dome is an essential parameter.
  • the hollow body no longer exhibits improved resistance to lateral impacts when its value exceeds 40% of the value of the maximum diameter.
  • this diameter is less than 10% of the value of the maximum diameter of the hollow body, the molding of this central part poses delicate problems, in particular for the production of low capacity hollow bodies.
  • the value of the diameter of the central part is between 15 and 30% of the maximum diameter of the hollow body.
  • the peripheral arcuate molding has a constant radius of curvature tangentially connecting with the side wall and with the annular zone.
  • the radius of curvature is in this case preferably between 10 and 25% of the maximum diameter of the hollow body.
  • the peripheral arcuate molding has two different constant radii of curvature.
  • the first radius of curvature corresponds to the part of the molding which connects to the side wall and is greater than the second radius of curvature which corresponds to the part of the molding which connects to the annular zone of the bottom.
  • These two successive radii of curvature are preferably chosen so such that the arcuate molding has no point of infection and that it tangentially connects on either side with the side wall and with the annular zone of the bottom.
  • the value of the first radius of curvature is preferably between 50 and 200% of the maximum diameter of the hollow body and that of the second radius of curvature between 10 and 25% of this same diameter.
  • the annular zone with which the bottom of the hollow body is provided contributes to improving the resistance of the hollow body to lateral impacts.
  • This area can be flat. It can also be slightly arched, preferably towards the inside of the hollow body.
  • the radius of curvature is generally greater than the maximum external diameter of the hollow body.
  • the annular zone is inclined relative to the longitudinal axis of the hollow body so that, when the latter is placed on its bottom, it rests on the peripheral arcuate molding and the internal edge of the annular zone is located at a level higher than its outer edge.
  • the annular zone has a frustoconical appearance.
  • the annular zone then forms an angle between 1 and 15 ° with a plane perpendicular to the longitudinal axis of the hollow body.
  • the annular zone can advantageously be used for engraving raised inscriptions indicating for example the capacity of the hollow body, the trade name of its producer, a mark or a warning.
  • the width of the annular zone is generally between 10 and 70% of the maximum diameter of the hollow body and preferably between 15 and 40% of this diameter.
  • the dome-shaped reentrant central part can have various general shapes. However, according to a preferred embodiment, this central part is constituted successively by an arcuate zone of connection with the annular zone, by an intermediate zone of frustoconical shape, and by a central cap directed towards the interior of the hollow body and is connecting to the frustoconical area.
  • the angle at the top of the frustoconical zone is generally between 15 and 90 ° and preferably between 30 and 75 °.
  • the hollow body according to the invention has a side wall of generally cylindrical shape. However, this wall must not not necessarily have perfect revolution symmetry. It is possible that the shape of this wall deviates from the shape of a perfect cylinder.
  • the hollow body can have an elliptical or polygonal section. In this case, it is preferred that the largest dimension of the sections perpendicular to the axis of the hollow body does not exceed twice the smallest.
  • the hollow body according to the invention can be made from any thermoplastic material which can be oriented molecularly.
  • thermoplastic material which can be oriented molecularly.
  • the hollow body can be produced by all known techniques leading to the production of molecularly oriented hollow bodies and in particular by blow molding or injection blow molding techniques.
  • the bottom of the hollow body 1 is successively formed by a peripheral arcuate molding 2 for connection to the side wall of the hollow body, by a substantially planar annular zone 3 connecting to the peripheral arcuate molding 2 and by a re-entrant central part 4 in the form of a dome connected to the annular zone, the diameter d of this central part being equal to approximately 25% of the maximum external diameter D of the hollow body 1.
  • the peripheral arcuate molding 2 has two successive radii of curvature, the first radius of curvature R 1 is equal to 100 mm and is greater than the second radius of curvature R 2 which is equal to 12 mm.
  • the annular zone 3 is of generally frustoconical shape and slightly arched towards the inside of the hollow body 1 along a radius of curvature R 3 equal to 150 mm.
  • this annular zone is inclined relative to the longitudinal axis of the hollow body 1 so that the angle a between the direction of the annular zone and a plane perpendicular to the longitudinal axis of the hollow body 1 is equal to 10 °.
  • the re-entrant central part 4 is constituted successively by an arcuate zone of radius of curvature R 4 equal to 7 mm ensuring the connection with the annular zone 3, by a zone of frustoconical shape 5 whose angle at the apex ⁇ is 30 ° and by a central cap with a radius of curvature R S equal to 9 mm.
  • the hollow body according to the invention is therefore particularly suitable for the packaging of non-carbonated table waters and carbonated drinks such as beer and lemonades.
  • thermoplastic material used is rigid polyvinyl chloride.
  • the operating conditions, in particular the parameters governing the orientation, are the same for the three series of bottles.
  • the base according to FIG. 2 is successively formed by an arcuate peripheral molding having two different successive radii of curvature, by a flat annular zone and by a re-entrant central dome-shaped part whose diameter is greater than 40% of the maximum diameter of the bottle.
  • the bottom according to fig.3 is formed by three successive moldings of constant radius and has no substantially planar annular zone.
  • the filled bottles are dropped in a horizontal position on a concrete base, the drop height being 0.70 m or 1.10 m. This test makes it possible to judge the resistance of the vials in the event of an accidental fall of a table or an exposure ray.
  • the bottle is attached to the end of a pendulum and strikes a vertical concrete wall with a potential energy of 1.5 kgm.
  • This test makes it possible to judge the resistance of the bottles in the event of accidental collisions such as, for example, those caused during the hanging of railway wagons ensuring their transport to the places of distribution.

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  • 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)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

Corps creux en matière thermoplastique orientée ayant une résistance améliorée aux chocs latéraux du fait qu'il est équipé d'un fond comportant successivement une moulure arquée périphérique 2 de raccordement à sa paroi latérale 1, une zone annulaire 3 sensiblement plane se raccordant à la moulure arquée périphérique 2 et une partie centrale 4 en forme de dôme rentrant qui est raccordée à la zone annulaire 3 et dont le diamètre est inférieur à 40% du diamètre externe maximum du corps creux.Hollow body in oriented thermoplastic material having improved resistance to lateral impact due to the fact that it is equipped with a bottom successively comprising a peripheral arcuate molding 2 for connection to its side wall 1, an annular zone 3 substantially planar connecting to the molding peripheral arc 2 and a central part 4 in the shape of a re-entrant dome which is connected to the annular zone 3 and whose diameter is less than 40% of the maximum external diameter of the hollow body.

Description

La présente invention se rapporte à un corps creux en matière thermoplastique orientée dont le corps est de forme générale cylindrique et dont le fond est rentrant, tel qu'une bouteille ou un récipient analogue.The present invention relates to a hollow body of oriented thermoplastic material, the body of which is generally cylindrical in shape and the bottom of which is re-entrant, such as a bottle or similar container.

Actuellement, il est fait de plus en plus souvent appel aux matières thermoplastiques pour la réalisation de corps creux tels que des bouteilles pour le conditionnement des liquides.Currently, use is made more and more often of thermoplastic materials for the production of hollow bodies such as bottles for packaging liquids.

Afin d'accroître la résistance mécanique de ces corps creux, ceux-ci sont de plus en plus moulés par soufflage dans des conditions, de température notamment, conduisant à l'orientation et de préférence à la biorientation suivant deux directions orthogonales des macromolécules de leur matériau constitutif.In order to increase the mechanical resistance of these hollow bodies, they are more and more blow molded under conditions, particularly of temperature, leading to the orientation and preferably to the biorientation in two orthogonal directions of the macromolecules of their constituent material.

En vue d'augmenter la stabilité en position verticale de ces corps creux, il est connu de les doter d'un fond rentrant car ce type de fonds présente une bonne résistance à la déformation notamment sous l'effet d'une pression interne.In order to increase the stability in the vertical position of these hollow bodies, it is known to provide them with a re-entrant bottom because this type of bottom has good resistance to deformation, in particular under the effect of internal pressure.

Les corps creux à fond rentrant présentent toutefois une résistance aux chocs, notamment au niveau de leur fond, qui laisse souvent à désirer. En particulier, ces corps creux résistent mal aux chocs latéraux qu'ils peuvent subir, lors de chutes accidentelles ou de leur transport par chemin de fer notamment.However, the hollow bodies with a recessed bottom have an impact resistance, particularly at the bottom, which often leaves something to be desired. In particular, these hollow bodies are poorly resistant to the lateral shocks that they can undergo, during accidental falls or during their transport by rail in particular.

La Demanderesse, après de nombreux essais, a maintenant trouvé une forme pour le fond rentrant de corps creux de forme générale cylindrique en matière thermoplastique orientée qui permet d'obtenir à la fois une bonne résistance à la déformation et une bonne résistance aux chocs latéraux.The Applicant, after numerous tests, has now found a shape for the bottom returning from hollow bodies of general shape cylindrical in thermoplastic oriented material which allows to obtain both good resistance to deformation and good resistance to side impacts.

La présente invention concerne dès lors un corps creux en matière thermoplastique orientée comportant une zone de col, une paroi latérale de forme générale cylindrique, et un fond rentrant dans lequel le fond est constitué successivement à partir de la périphérie par une moulure arquée périphérique de raccordement à la paroi latérale, par une zone annulaire sensiblement plane se raccordant à la moulure arquée périphérique, et par une partie centrale en forme de dôme rentrant qui est raccordée à la zone annulaire et dont le diamètre est inférieur à 40 % du diamètre externe maximum du corps creux.The present invention therefore relates to a hollow body of oriented thermoplastic material comprising a neck region, a generally cylindrical side wall, and a re-entrant bottom in which the bottom is formed successively from the periphery by a peripheral arcuate molding for connection. to the side wall, by a substantially planar annular zone connecting to the peripheral arcuate molding, and by a central part in the shape of a re-entrant dome which is connected to the annular zone and whose diameter is less than 40% of the maximum external diameter of the hollow body.

La valeur du diamètre de la partie centrale en forme de dôme rentrant est un paramètre essentiel. En effet, on çonstate que le corps creux ne présente plus une résistance améliorée aux chocs latéraux lorsque sa valeur dépasse 40 % de la valeur du diamètre maximum. Par ailleurs, lorsque ce diamètre est inférieur à 10 % de la valeur du diamètre maximum du corps creux, le moulage de cette partie centrale pose des problèmes délicats, notamment pour la production de corps creux de faible capacité. De préférence, la valeur du diamètre de la partie centrale est comprise entre 15 et 30 % du diamètre maximum du corps creux.The value of the diameter of the central part in the shape of a re-entrant dome is an essential parameter. In fact, it is noted that the hollow body no longer exhibits improved resistance to lateral impacts when its value exceeds 40% of the value of the maximum diameter. Furthermore, when this diameter is less than 10% of the value of the maximum diameter of the hollow body, the molding of this central part poses delicate problems, in particular for the production of low capacity hollow bodies. Preferably, the value of the diameter of the central part is between 15 and 30% of the maximum diameter of the hollow body.

Selon un premier mode de réalisation de l'invention, la moulure arquée périphérique présente un rayon de courbure constant se raccordant tangentiellement avec la paroi latérale et avec la zone annulaire. Le rayon de courbure est dans ce cas compris de préférence entre 10 et 25 % du diamètre maximum du corps creux.According to a first embodiment of the invention, the peripheral arcuate molding has a constant radius of curvature tangentially connecting with the side wall and with the annular zone. The radius of curvature is in this case preferably between 10 and 25% of the maximum diameter of the hollow body.

Selon un second mode de réalisation, qui est préféré, la moulure arquée périphérique présente deux rayons de courbure constants différents. Dans ce cas, le premier rayon de courbure correspond à la partie de la moulure qui se raccorde à la paroi latérale et est supérieur au second rayon de courbure qui correspond à la partie de la moulure qui se raccorde à la zone annulaire du fond. Ces deux rayons de courbure successifs sont choisis de préférence de façon telle que la moulure arquée ne présente pas de point d'inflection et qu'elle se raccorde tangentiellement de part et d'autre avec la paroi latérale et avec la zone annulaire du fond. La valeur du premier rayon de courbure est de préférence comprise entre 50 et 200 % du diamètre maximum du corps creux et celle du second rayon de courbure entre 10 et 25 % de ce même diamètre.According to a second embodiment, which is preferred, the peripheral arcuate molding has two different constant radii of curvature. In this case, the first radius of curvature corresponds to the part of the molding which connects to the side wall and is greater than the second radius of curvature which corresponds to the part of the molding which connects to the annular zone of the bottom. These two successive radii of curvature are preferably chosen so such that the arcuate molding has no point of infection and that it tangentially connects on either side with the side wall and with the annular zone of the bottom. The value of the first radius of curvature is preferably between 50 and 200% of the maximum diameter of the hollow body and that of the second radius of curvature between 10 and 25% of this same diameter.

La zone annulaire dont le fond du corps creux est pourvu contribue à améliorer la résistance du corps creux aux chocs latéraux. Cette zone peut être plane. Elle peut aussi être légèrement arquée, de préférence vers l'intérieur du corps creux. Dans ce cas, le rayon de courbure est en général supérieur au diamètre externe maximum du corps creux. Suivant un mode de réalisation préféré, la zone annulaire est inclinée par rapport à l'axe longitudinal du corps creux de façon que, lorsque ce dernier est posé sur son fond, il prenne appui sur la moulure arquée périphérique et que le bord interne de la zone annulaire soit situé à un niveau supérieur à son bord externe. Dans ce cas, la zone annulaire est d'allure tronconique. De préférence, la zone annulaire forme alors un angle compris entre 1 et 15° avec un plan perpendiculaire à l'axe longitudinal du corps creux. La zone annulaire peut avantageusement être exploitée pour la gravure d'inscriptions en relief indiquant par exemple la contenance du corps creux, le nom commercial de son producteur, une marque ou un avertissement. La largeur de la zone annulaire est comprise en général entre 10 et 70 % du diamètre maximum du corps creux et de préférence entre 15 et 40 % de ce diamètre.The annular zone with which the bottom of the hollow body is provided contributes to improving the resistance of the hollow body to lateral impacts. This area can be flat. It can also be slightly arched, preferably towards the inside of the hollow body. In this case, the radius of curvature is generally greater than the maximum external diameter of the hollow body. According to a preferred embodiment, the annular zone is inclined relative to the longitudinal axis of the hollow body so that, when the latter is placed on its bottom, it rests on the peripheral arcuate molding and the internal edge of the annular zone is located at a level higher than its outer edge. In this case, the annular zone has a frustoconical appearance. Preferably, the annular zone then forms an angle between 1 and 15 ° with a plane perpendicular to the longitudinal axis of the hollow body. The annular zone can advantageously be used for engraving raised inscriptions indicating for example the capacity of the hollow body, the trade name of its producer, a mark or a warning. The width of the annular zone is generally between 10 and 70% of the maximum diameter of the hollow body and preferably between 15 and 40% of this diameter.

La partie centrale rentrante en forme de dôme peut avoir des formes générales diverses. Toutefois, suivant un mode de réalisation préféré, cette partie centrale est constituée successivement par une zone arquée de raccordement avec la zone annulaire, par une zone intermédiaire d'allure tronconique, et par une calotte centrale dirigée vers l'intérieur du corps creux et se raccordant à la zone tronconique. L'angle au sommet de la zone tronconique est compris en général entre 15 et 90° et de préférence entre 30 et 75°.The dome-shaped reentrant central part can have various general shapes. However, according to a preferred embodiment, this central part is constituted successively by an arcuate zone of connection with the annular zone, by an intermediate zone of frustoconical shape, and by a central cap directed towards the interior of the hollow body and is connecting to the frustoconical area. The angle at the top of the frustoconical zone is generally between 15 and 90 ° and preferably between 30 and 75 °.

Le corps creux conforme à l'invention présente une paroi latérale de forme générale cylindrique. Cependant cette paroi ne doit pas nécessairement présenter une symétrie de révolution parfaite. Il est possible que la forme de cette paroi s'écarte de la forme d'un cylindre parfait. Ainsi, le corps creux peut avoir une section elliptique ou polygonale. Dans ce cas, on préfère que la plus grande dimension des sections perpendiculaires à l'axe du corps creux n'excède pas le double de la plus petite.The hollow body according to the invention has a side wall of generally cylindrical shape. However, this wall must not not necessarily have perfect revolution symmetry. It is possible that the shape of this wall deviates from the shape of a perfect cylinder. Thus, the hollow body can have an elliptical or polygonal section. In this case, it is preferred that the largest dimension of the sections perpendicular to the axis of the hollow body does not exceed twice the smallest.

Le corps creux conforme à l'invention peut être réalisé à partir d'une matière thermoplastique quelconque pouvant être orientée moléculairement. A titre d'exemples non limitatifs de ces dernières, on peut citer les résines à base de chlorure de vinyle, les polymères et les copolymères produits à partir d'alpha-oléfines contenant jusqu'à huit atomes de carbone dans leur molécule, les polymères et copolymères acryliques et notamment ceux produits à partir du nitrile acrylique, les polyesters tels que le poly- téréphtalate d'éthylèneglycol, et les polycarbonates.The hollow body according to the invention can be made from any thermoplastic material which can be oriented molecularly. By way of non-limiting examples of the latter, mention may be made of vinyl chloride-based resins, polymers and copolymers produced from alpha-olefins containing up to eight carbon atoms in their molecule, polymers and acrylic copolymers and in particular those produced from acrylic nitrile, polyesters such as polyethylene terephthalate, and polycarbonates.

Le corps creux peut être produit par toutes les techniques connues conduisant à la production de corps creux orientés moléculairement et notamment par les techniques de moulage par soufflage ou d'injection-soufflage.The hollow body can be produced by all known techniques leading to the production of molecularly oriented hollow bodies and in particular by blow molding or injection blow molding techniques.

Le corps creux selon l'invention est par ailleurs illustré à la figure 1 des dessins annexés qui représente en coupe partielle un fond d'un corps creux suivant une forme de réalisation préférée de l'invention.The hollow body according to the invention is also illustrated in Figure 1 of the accompanying drawings which shows in partial section a bottom of a hollow body according to a preferred embodiment of the invention.

Ainsi qu'il est représenté sur cette figure, le fond du corps creux 1 est constitué successivement par une moulure arquée périphérique 2 de raccordement à la paroi latérale du corps creux, par une zone annulaire 3 sensiblement plane se raccordant à la moulure arquée périphérique 2 et par une partie centrale rentrante 4 en forme de dôme raccordée à la zone annulaire, le diamètre d de cette partie centrale étant égal à environ 25 % du diamètre externe maximum D du corps creux 1.As shown in this figure, the bottom of the hollow body 1 is successively formed by a peripheral arcuate molding 2 for connection to the side wall of the hollow body, by a substantially planar annular zone 3 connecting to the peripheral arcuate molding 2 and by a re-entrant central part 4 in the form of a dome connected to the annular zone, the diameter d of this central part being equal to approximately 25% of the maximum external diameter D of the hollow body 1.

La moulure arquée périphérique 2 présente deux rayons de courbures successifs, le premier rayon de courbure R1 vaut 100 mm et est supérieur au second rayon de courbure R2 qui vaut 12 mm.The peripheral arcuate molding 2 has two successive radii of curvature, the first radius of curvature R 1 is equal to 100 mm and is greater than the second radius of curvature R 2 which is equal to 12 mm.

La zone annulaire 3 est de forme générale tronconique et légèrement arquée vers l'intérieur du corps creux 1 suivant un rayon de courbure R3 égal à 150 mm. En outre, cette zone annulaire est inclinée par rapport à l'axe longitudinal du corps creux 1 de telle sorte que l'angle a entre la direction de la zone annulaire et un plan perpendiculaire à l'axe longitudinal du corps creux 1 soit égal à 10°. La partie centrale rentrante 4 est constituée successivement par une zone arquée de rayon de courbure R4 égal à 7 mm assurant le raccordement avec la zone annulaire 3, par une zone d'allure tronconique 5 dont l'angle au sommet β vaut 30° et par une calotte centrale de rayon de courbure RS égal à 9 mm.The annular zone 3 is of generally frustoconical shape and slightly arched towards the inside of the hollow body 1 along a radius of curvature R 3 equal to 150 mm. In addition, this annular zone is inclined relative to the longitudinal axis of the hollow body 1 so that the angle a between the direction of the annular zone and a plane perpendicular to the longitudinal axis of the hollow body 1 is equal to 10 °. The re-entrant central part 4 is constituted successively by an arcuate zone of radius of curvature R 4 equal to 7 mm ensuring the connection with the annular zone 3, by a zone of frustoconical shape 5 whose angle at the apex β is 30 ° and by a central cap with a radius of curvature R S equal to 9 mm.

Le corps creux conforme à l'invention convient dès lors particulièrement bien pour le conditionnement des eaux de table non carbonatées et des boissons carbonatées telles de la bière et les limonades.The hollow body according to the invention is therefore particularly suitable for the packaging of non-carbonated table waters and carbonated drinks such as beer and lemonades.

Afin de mieux faire apparaître les avantages obtenus grâce au corps creux conforme à l'invention, on a réalisé trois séries de flacons orientés d'une contenance de 1500 cc en les dotant d'un fond suivant la fig.1 ou de fonds traditionnels tels que représentés en coupe aux fig.2 et 3 des dessins annexés.In order to better show the advantages obtained thanks to the hollow body according to the invention, three series of oriented bottles with a capacity of 1500 cc have been produced by providing them with a bottom according to FIG. 1 or with traditional bottoms such as shown in section in fig. 2 and 3 of the accompanying drawings.

La matière thermoplastique mise en oeuvre est du polychlorure de vinyle rigide. Les conditions opératoires, en particulier les paramètres régissant l'orientation sont les mêmes pour les trois séries de flacons.The thermoplastic material used is rigid polyvinyl chloride. The operating conditions, in particular the parameters governing the orientation, are the same for the three series of bottles.

Les cotes principales des fonds de corps creux réalisés suivant les fig. 1 à 3 sont données ci-après :The main dimensions of the hollow body bottoms produced according to FIGS. 1 to 3 are given below:

Fig.1Fig. 1

Figure imgb0001
Figure imgb0001

Fig.2Fig. 2

Figure imgb0002
Figure imgb0002

Fig.3Fig. 3

Figure imgb0003
Figure imgb0003

Le fond suivant la fig.2 est constitué successivement par une moulure périphérique arquée présentant deux rayons de courbures successifs différents, par une zone annulaire plane et par une partie centrale rentrante en forme de dôme dont le diamètre est supérieur à 40 % du diamètre maximum du flacon.The base according to FIG. 2 is successively formed by an arcuate peripheral molding having two different successive radii of curvature, by a flat annular zone and by a re-entrant central dome-shaped part whose diameter is greater than 40% of the maximum diameter of the bottle.

Le fond suivant la fig.3 est constitué par trois moulures successives de rayon constant et ne comporte aucune zone annulaire sensiblement plane.The bottom according to fig.3 is formed by three successive moldings of constant radius and has no substantially planar annular zone.

Les séries de flacons ainsi obtenus sont ensuite remplis et obturés de façon identique puis ils sont soumis à 15°C aux deux essais de résistance aux chocs décrits ci-après.The series of bottles thus obtained are then filled and closed in an identical manner and then they are subjected at 15 ° C. to the two impact resistance tests described below.

Dans un premier essai, on laisse tomber les flacons remplis en position horizontale sur un socle de béton, la hauteur de chute étant de 0,70 m ou de 1,10 m. Ce test permet de juger de la résistance des flacons en cas de chute accidentelle d'une table ou d'un rayon d'exposition.In a first test, the filled bottles are dropped in a horizontal position on a concrete base, the drop height being 0.70 m or 1.10 m. This test makes it possible to judge the resistance of the vials in the event of an accidental fall of a table or an exposure ray.

Dans le second essai, le flacon est attaché à l'extrémité d'un pendule et heurte une paroi verticale en béton avec une énergie potentielle de 1,5 kgm. Ce test permet de juger de la résistance des flacons en cas de heurts accidentels tels que par exemple ceux occasionnés lors de l'accrochage des wagons de chemin de fer assurant leur transport vers les lieux de distribution.In the second test, the bottle is attached to the end of a pendulum and strikes a vertical concrete wall with a potential energy of 1.5 kgm. This test makes it possible to judge the resistance of the bottles in the event of accidental collisions such as, for example, those caused during the hanging of railway wagons ensuring their transport to the places of distribution.

Les résultats enregistrés lors de ces essais sont repris au tableau I ci-après. Les nombres indiqués en regard des deux types d'essais donnent le nombre de flacons cassés sur 100 soumis à l'essai.

Figure imgb0004
The results recorded during these tests are shown in Table I below. The numbers shown opposite the two types of tests give the number of broken vials out of 100 tested.
Figure imgb0004

On constate directement que les corps creux conformes à l'invention (fig.1) présentent une résistance aux chocs latéraux nettement améliorée par rapport aux autres corps creux (fig.2 et 3).It can be seen directly that the hollow bodies in accordance with the invention (fig.1) have a significantly improved resistance to side impacts compared to the other hollow bodies (fig.2 and 3).

Claims (9)

1 - Corps creux en matière thermoplastique orientée comportant une zone de col, une paroi latérale de forme générale cylindrique (1), et un fond rentrant caractérisé en ce que le fond est constitué successivement à partir de la périphérie par une moulure arquée périphérique (2) de raccordement à la paroi latérale, par une zone annulaire (3) sensiblement plane se raccordant à la moulure arquée périphérique (2), et par une partie centrale (4) en forme de dôme rentrant qui est raccordée à la zone annulaire (3) et dont le diamètre est inférieur à 40 % du diamètre externe maximum du corps creux.1 - Hollow body in oriented thermoplastic material comprising a neck area, a generally cylindrical side wall (1), and a re-entrant bottom characterized in that the bottom is successively formed from the periphery by a peripheral arcuate molding (2 ) of connection to the side wall, by a substantially planar annular zone (3) connecting to the peripheral arcuate molding (2), and by a central part (4) in the shape of a re-entrant dome which is connected to the annular zone (3 ) and whose diameter is less than 40% of the maximum external diameter of the hollow body. 2 - Corps creux suivant la revendication 1, caractérisé en ce que le diamètre de la partie centrale (4) du dôme rentrant est compris entre 15 et 30 % du diamètre externe maximum de corps creux.2 - hollow body according to claim 1, characterized in that the diameter of the central part (4) of the re-entrant dome is between 15 and 30% of the maximum external diameter of hollow body. 3 - Corps creux suivant la revendication 1 ou 2, caractérisé en ce que la moulure arquée périphérique (2) présente un rayon de courbure constant.3 - Hollow body according to claim 1 or 2, characterized in that the peripheral arcuate molding (2) has a constant radius of curvature. 4 - Corps creux suivant la revendication 1 ou 2, caractérisé en ce que la moulure arquée périphérique (2) présente deux rayons de courbure constants différents dont le premier qui correspond à la partie de la moulure qui se raccorde à la paroi latérale (1) est supérieur au second qui correspond à la partie de la moulure qui se raccorde à la zone annulaire (3).4 - Hollow body according to claim 1 or 2, characterized in that the peripheral arcuate molding (2) has two different constant radii of curvature, the first of which corresponds to the part of the molding which is connected to the side wall (1) is greater than the second which corresponds to the part of the molding which connects to the annular zone (3). 5 - Corps creux suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que la zone annulaire (3) est arquée vers l'intérieur du corps creux.5 - Hollow body according to any one of claims 1 to 4, characterized in that the annular zone (3) is arcuate towards the inside of the hollow body. 6 - Corps creux suivant l'une quelconque des revendications 1 à 5, caractérisé en ce que la zone annulaire (3) est inclinée par rapport à l'axe longitudinal du corps creux de façon que, lorsque ce dernier est posé sur son fond, il prenne appui sur la moulure arquée périphérique (2) et que le bord interne de la zone annulaire (3) soit situé à un niveau supérieur à son bord externe.6 - hollow body according to any one of claims 1 to 5, characterized in that the annular zone (3) is inclined relative to the longitudinal axis of the hollow body so that, when the latter is placed on its bottom, it is supported on the peripheral arcuate molding (2) and that the internal edge of the annular zone (3) is located at a level higher than its external edge. 7 - Corps creux suivant la revendication 6, caractérisé en ce que la zone annulaire (3) à l'allure d'un tronc de cône dont l'angle avec un plan perpendiculaire à l'axe longitudinal du corps creux est compris entre 1 et 15°.7 - Hollow body according to claim 6, characterized in that the annular zone (3) in the shape of a truncated cone of which the angle with a plane perpendicular to the longitudinal axis of the hollow body is between 1 and 15 °. 8 - Corps creux suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que la partie centrale (4) en forme de dôme rentrant est constituée successivement par une zone arquée de raccordement avec la zone annulaire, par une zone (5) d'allure tronconique, et par une calotte centrale dirigée vers l'intérieur du corps creux et se raccordant à la zone tronconique.8 - Hollow body according to any one of claims 1 to 7, characterized in that the central part (4) in the shape of a re-entrant dome is formed successively by an arcuate zone of connection with the annular zone, by a zone (5) of frustoconical shape, and by a central cap directed towards the inside of the hollow body and connecting to the frustoconical zone. 9 - Corps creux suivant la revendication 8, caractérisé en ce que l'angle au sommet de la zone tronconique (5) est compris entre 15 et 90°.9 - Hollow body according to claim 8, characterized in that the angle at the top of the frustoconical area (5) is between 15 and 90 °.
EP78200288A 1977-11-10 1978-11-06 Hollow body made of oriented thermoplastic material Expired EP0002082B1 (en)

Applications Claiming Priority (2)

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FR7734381 1977-11-10
FR7734381A FR2408524A1 (en) 1977-11-10 1977-11-10 HOLLOW BODY IN ORIENTED THERMOPLASTIC MATERIAL

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EP0002082A1 true EP0002082A1 (en) 1979-05-30
EP0002082B1 EP0002082B1 (en) 1982-06-23

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DE (1) DE2861915D1 (en)
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ATA799178A (en) 1982-04-15
FR2408524B1 (en) 1980-08-22
FR2408524A1 (en) 1979-06-08
BR7807402A (en) 1979-07-24
DE2861915D1 (en) 1982-08-12
JPS5472181A (en) 1979-06-09
EP0002082B1 (en) 1982-06-23
AT368966B (en) 1982-11-25
US4231483A (en) 1980-11-04
ES245583U (en) 1980-07-16
IT7829636A0 (en) 1978-11-09
IT1100212B (en) 1985-09-28
ES245583Y (en) 1981-01-16

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