EP1373076B1 - Thermoplastic container whereof the base comprises a cross-shaped impression - Google Patents
Thermoplastic container whereof the base comprises a cross-shaped impression Download PDFInfo
- Publication number
- EP1373076B1 EP1373076B1 EP02722390A EP02722390A EP1373076B1 EP 1373076 B1 EP1373076 B1 EP 1373076B1 EP 02722390 A EP02722390 A EP 02722390A EP 02722390 A EP02722390 A EP 02722390A EP 1373076 B1 EP1373076 B1 EP 1373076B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cross
- container
- branches
- shaped impression
- feet
- 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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Classifications
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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
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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
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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
- B65D23/00—Details of bottles or jars not otherwise provided for
- B65D23/001—Supporting means fixed to the container
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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
- 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
Definitions
- the present invention relates to improvements made to containers, in particular bottles, made of thermoplastic material obtained by blowing or stretch-blowing a preform, these containers comprising a side wall and a bottom connected to the latter, said bottom comprising, in its region central, a multi-branch cross-shaped imprint imprinted in the external face of the bottom wall, this cross imprint comprising a substantially circular central hollow around which radiate the branches of radial extent distributed regularly.
- Containers, in particular bottles, thus formed can be filled with a hot liquid (that is to say having a temperature at most equal to about 94 ° C).
- a hot liquid that is to say having a temperature at most equal to about 94 ° C.
- the bottom of a container thus designed, the material of the central part of which has remained in an amorphous state and therefore has less mechanical resistance in contact with the hot liquid, is mechanically reinforced by the imprint in the shape of a multibranch cross and does not does not deform under the effect of heat.
- the invention therefore aims to remedy this drawback and to provide an improved architecture of the bottom of the container which allows said container to withstand a pasteurization process without deformation of its bottom.
- a container in particular a bottle, made of thermoplastic material as set out above is characterized, being arranged in accordance with the invention, in that the bottom is, moreover, of petaloid type, with the bottom wall of generally convex outwardly with at least three feet located towards the periphery of the bottom and formed by growths regularly distributed angularly and separated from each other by a portion of the convex wall of the bottom, in that the feet and the branches of the cross imprint are equal in number, in that the branches of the cross impression are arranged in correspondence with the feet and aligned radially respectively with these, in that each leg has a stress absorption notch in its support part, and in that, in each foot, the stress absorption notch remains radially separated from the end of the corresponding branch of the cross impression.
- the containers according to the invention are capable, a fortiori, of undergoing without damage a hot filling (filling with a hot liquid at a temperature at most equal at around 94 ° C).
- the substantially circular central bowl has a depth substantially greater than that branches of the cross print.
- the portions of the convex wall of the bottom which separate two adjacent feet extend between the corresponding adjacent arms of the cross impression, up to substantially the edge of the central bowl. But to avoid a central weakening, it is preferable that the aforesaid portions of the convex wall of the bottom which separate two adjacent feet do not open into the central bowl and that their end situated radially towards the center remains separated from the central bowl by a rim , which edges contribute to stiffen the periphery of the central hollow.
- the petaloid bottom can, in principle, include any number, even high, of feet.
- the hollow imprint in a multibranch cross can in principle include any number, even high, of branches.
- the branches of the cross impression have a radial extent which makes them arrive, in part, in the initiation of the petals constituting the feet and while, moreover, the branches of the cross impression have a substantial width, it follows that, in the container of the invention, it is not possible to provide a substantial number of feet and branches of the cross imprint. In practice, this number must be greater than three (minimum number to ensure a stable base of the container), but does not seem to be able to exceed five. In practice the number of four seems to correspond to the best compromise.
- the thickness of the bottom of the container arranged in accordance with the invention is significantly less than that of the bottom with a single multibranch cross impression provided in a container intended for hot filling only: the use of provisions of the invention can significantly reduce the amount of material, of the order of 20 to 30% for the bottom alone and of the order of 3 to 10% for the entire container, depending on the type of container. This therefore results in a substantial saving of money, which makes the provisions of the invention advantageous if only for the sole application of containers suitable for hot filling.
- the invention relates to a container made of thermoplastic material, for example PET, obtained by blow molding or stretch blow molding of a preform previously obtained by molding.
- the bottle generally designated by the reference 1 in FIGS. 2B and 3B (in which only the lower part of the bottle is visible), has a side wall 2 and a bottom 3 connected to the latter.
- the bottom 3 has, in its central region, an imprint 4 in the form of a multibranch cross imprinted in the hollow on the external face of the bottom wall 5.
- the cross imprint 4 has a substantially circular central bowl 6 (which results in a substantially round plate 7 projecting inside the bottle) in the center of which is the button or pad 9 of material corresponding, in known manner, to the housing of the preform injection point.
- Around the central bowl 6 radiate the branches 8 of radial extent distributed regularly.
- the branches 8 of the cross impression 4 are four in number, spaced apart by 90 °, for a reason which will be explained below.
- the branches 8 of the cross impression 4 have substantially large dimensions, with a pronounced relief.
- the branches 8 have parallel edges giving them an individual rectangular shape or, as illustrated, edges which are substantially divergent in the direction of the periphery giving them a substantially trapezoidal shape.
- Their length is approximately twice their average width, and their average depth is approximately half their average width.
- the cross impression 4 is formed in the central region of the bottom wall 5 in which the thermoplastic material has remained amorphous.
- the bottom 3 is shaped according to the so-called "petaloid" type with the bottom wall 5 having a generally convex shape towards the outside.
- protuberances 10 projecting outwardly and located towards the periphery of the bottom; more precisely, the most projecting part 11 of the protuberances 10 is located in the vicinity of the periphery of the bottom while the protuberances descend in a gentle slope towards the center of the bottom.
- the protrusions 10 are regularly distributed angularly and are separated from each other by a portion of a convex bottom wall. which constitutes a valley 12 of radial extent separating two adjacent outgrowths.
- the protrusions 10 constitute feet, the most projecting part 11 of which is the support zone by which the container rests on a support.
- the protrusions or feet 10 and the branches 8 of the cross formed by the central imprint 4 are in equal number because, as can be seen particularly well in FIG. 1, the branches 8 of the cross imprint are engaged , at least towards their respective ends, in the feet 10, at least in the least projecting part of these.
- the feet 10 and the branches 8 are not only equal in number, but are also mutually aligned radially.
- Such a conformation is, in practice, imposed by the need to have at least three feet so that the container can rest stably on a support and by the need to have branches 8 of the cross impression 4 which have a relief and substantial dimensions, especially in terms of their width.
- the number of feet, and therefore the number of branches 8 of the cross impression 4 cannot be less than three, but conversely cannot, in practice, be too high in view of the requirements obtaining correct shapes by blowing during manufacture.
- the bottom 3 has good rigidity during use, while having a relative aptitude for deformation in the presence of hot liquid, it is desirable to provide suitable reinforcing elements.
- the portions of the convex wall or valleys 12 which separate two adjacent feet extend between two arms 8 consecutive of the central impression in the form of a cross until substantially at the edge of the central bowl 6, without however opening into that -this and leaving a slight rim 15 remaining, forming an armature, between their radially inner end and the central bowl 6.
- the most protruding part 11 of the feet 10 is not smooth, but has a depression or notch 13 with a concavity facing outwards.
- the possible deformation which may result therefrom is then located at this notch 13, called the stress absorption notch.
- the presence of the stress absorption notch 13 reveals two support zones 11 a and 11 b located on either side thereof. This results in a doubling of the support zones which are not four (in the example considered) corresponding to the number of feet, but eight. This results in better stability of the container resting on a support.
- each foot 10 shows a transverse bar 14 between the radially outer end of each branch 8 of the central cross-shaped imprint 4 and the stress absorption notch 13 of the foot 10 which is located in the extension of the previous one.
- the transverse bar 14 serves, on the one hand, to stiffen the gently sloping part of the foot 10 by bracing the two lateral edges of radial extent of the foot 10 and, on the other hand, serves as an articulation to the central part of the bottom stiffened by the cross impression 4 when this central part is sucked inwards during the cooling of the liquid.
- the bottle thus formed can withstand, without appreciable deformation of its bottom, a process of pasteurization of its liquid content, whether it is a flat liquid (for example fruit juice) or a liquid containing dissolved gas. or carbonated liquid (for example beer).
- a flat liquid for example fruit juice
- a liquid containing dissolved gas for example beer
- carbonated liquid for example beer
- the material constituting the bottom has a relatively reduced thickness, compared to the previous containers (for example reduction of the order of 20 to 30%).
- the bottle of the invention is, from this point of view, much more advantageous than the current bottles suitable for hot filling, which have a substantially thicker bottom, in the case of bottles of the same type.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Dental Preparations (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Pens And Brushes (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Road Signs Or Road Markings (AREA)
Abstract
Description
La présente invention concerne des perfectionnements apportés aux récipients, notamment aux bouteilles, en matière thermoplastique obtenus par soufflage ou étirage-soufflage d'une préforme, ces récipients comportant une paroi latérale et un fond raccordé à cette dernière, ledit fond comportant, dans sa région centrale, une empreinte en forme de croix multibranche imprimée en creux dans la face externe de la paroi de fond, cette empreinte en croix comportant un creux central sensiblement circulaire autour duquel rayonnent les branches d'étendue radiale réparties régulièrement.The present invention relates to improvements made to containers, in particular bottles, made of thermoplastic material obtained by blowing or stretch-blowing a preform, these containers comprising a side wall and a bottom connected to the latter, said bottom comprising, in its region central, a multi-branch cross-shaped imprint imprinted in the external face of the bottom wall, this cross imprint comprising a substantially circular central hollow around which radiate the branches of radial extent distributed regularly.
Des récipients, notamment des bouteilles, ainsi constitués peuvent être remplis avec un liquide chaud (c'est-à-dire ayant une température au plus égale à environ 94°C). Le fond d'un récipient ainsi conçu, dont le matériau de la partie centrale est resté à l'état amorphe et présente donc une résistance mécanique moindre au contact du liquide chaud, est mécaniquement renforcé par l'empreinte en forme de croix multibranche et ne se déforme pas sous l'effet de la chaleur.Containers, in particular bottles, thus formed can be filled with a hot liquid (that is to say having a temperature at most equal to about 94 ° C). The bottom of a container thus designed, the material of the central part of which has remained in an amorphous state and therefore has less mechanical resistance in contact with the hot liquid, is mechanically reinforced by the imprint in the shape of a multibranch cross and does not does not deform under the effect of heat.
Toutefois, de tels récipients ne peuvent pas supporter un processus de pasteurisation du liquide qu'ils contiennent (par exemple traitement thermique à une température de l'ordre de 70°C, pendant un temps de l'ordre de 20 minutes). Au cours de la pasteurisation, le liquide voit son volume augmenter sensiblement sous l'action de la température et le matériau chaud du fond des récipients n'est pas capable de supporter la contrainte accrue sans déformation.However, such containers cannot withstand a process of pasteurization of the liquid which they contain (for example heat treatment at a temperature of the order of 70 ° C, for a time of the order of 20 minutes). During pasteurization, the liquid sees its volume increase significantly under the action of temperature and the hot material at the bottom of the containers is not capable of withstanding the increased stress without deformation.
Le même problème se pose a fortiori, de façon aggravée, lorsque le liquide à pasteuriser qui est enfermé dans le récipient contient du gaz dissous sous pression (liquide carbonaté) - cas de la bière par exemple -. Le matériau du fond du récipient non seulement doit supporter la contrainte accrue due à l'augmentation du volume du liquide chaud, mais il doit aussi supporter l'accroissement considérable de pression du gaz chaud. Les récipients précités ne sont pas en mesure de supporter de telles contraintes sans déformations importantes du fond.The same problem arises a fortiori, in an aggravated way, when the liquid to be pasteurized which is enclosed in the container contains gas dissolved under pressure (carbonated liquid) - case of beer for example -. The material of the bottom of the container not only must withstand the increased stress due to the increase in the volume of the hot liquid, but it must also withstand the considerable increase in pressure of the hot gas. The aforementioned containers are not able to withstand such stresses without significant deformation of the bottom.
L'invention a donc pour but de remédier à cet inconvénient et de proposer une architecture perfectionnée du fond du récipient qui permette audit récipient de supporter un processus de pasteurisation sans déformation de son fond.The invention therefore aims to remedy this drawback and to provide an improved architecture of the bottom of the container which allows said container to withstand a pasteurization process without deformation of its bottom.
A ces fins, un récipient, notamment une bouteille, en matériau thermoplastique tel qu'exposé précédemment se caractérise, étant agencé conformément à l'invention, en ce que le fond est, en outre, de type pétaloïde, avec la paroi de fond de forme généralement convexe vers l'extérieur avec au moins trois pieds situés vers la périphérie du fond et formés par des excroissances régulièrement réparties angulairement et séparées l'une de l'autre par une portion de paroi convexe du fond,
en ce que les pieds et les branches de l'empreinte en croix sont en nombre égal,
en ce que les branches de l'empreinte en croix sont disposées en correspondance avec les pieds et alignées radialement respectivement avec ceux-ci,
en ce que chaque pied comporte une encoche d'absorption des contraintes dans sa partie d'appui, et
en ce que, dans chaque pied, l'encoche d'absorption des contraintes reste radialement séparée de l'extrémité de la branche correspondante de l'empreinte en croix.For these purposes, a container, in particular a bottle, made of thermoplastic material as set out above is characterized, being arranged in accordance with the invention, in that the bottom is, moreover, of petaloid type, with the bottom wall of generally convex outwardly with at least three feet located towards the periphery of the bottom and formed by growths regularly distributed angularly and separated from each other by a portion of the convex wall of the bottom,
in that the feet and the branches of the cross imprint are equal in number,
in that the branches of the cross impression are arranged in correspondence with the feet and aligned radially respectively with these,
in that each leg has a stress absorption notch in its support part, and
in that, in each foot, the stress absorption notch remains radially separated from the end of the corresponding branch of the cross impression.
Certes, il est connu depuis longtemps d'équiper des récipients, tels que des bouteilles, de fonds de type pétaloïde qui sont largement utilisés pour les récipients contenant des liquides gazéifiés (liquides carbonatés notamment) : les creux radiaux séparant les pieds en "pétales" sont aptes à absorber les efforts dus à la mise sous pression lors du remplissage et maintiennent les portées d'appui des pieds dans une situation de coplanéité sensiblement perpendiculaire à l'axe du récipient.Certainly, it has long been known to equip receptacles, such as bottles, with petaloid-type bottoms which are widely used for receptacles containing carbonated liquids (carbonated liquids in particular): the radial hollows separating the feet into "petals" are able to absorb the forces due to pressurization during filling and maintain the bearing surfaces of the feet in a situation of coplanarity substantially perpendicular to the axis of the container.
Dans le contexte du récipient conforme à l'invention, on met donc à profit la capacité des fonds pétaloïdes à supporter correctement la pression intérieure au récipient pour lui faire encaisser, sans qu'il se déforme, la surpression due à l'augmentation de volume du liquide chauffé lors du processus de pasteurisation.In the context of the container according to the invention, we therefore take advantage of the ability of the petaloid bottoms to properly withstand the pressure inside the container to make it absorb, without it deforming, the overpressure due to the increase in volume. liquid heated during the pasteurization process.
Le récipient conforme à l'invention combine les effets positifs et avantageux :
- d'une part, du fond pétaloïde qui supporte sans déformation l'accroissement de volume du liquide chaud,
et - d'autre part, du fond à empreinte en étoile multibranche qui peut, sans modifier la planéité des pieds de la partie pétaloïde, se déformer et accompagner, en se déformant vers l'intérieur, la réduction de volume du liquide pasteurisé lors de son refroidissement, cette capacité à une déformation contrôlée de la partie centrale du fond (sensiblement dans la zone de matériau amorphe) induisant une réduction de la déformation subie simultanément par la paroi du corps du récipient, laquelle paroi est, à cet effet, constituée sous forme de panneaux juxtaposés ; la conséquence en est que lesdits panneaux prévus sur la paroi du corps peuvent être réalisés avec une surface moindre, ce qui laisse plus de liberté pour la conception de l'ensemble du récipient.
- on the one hand, the petaloid bottom which supports without deformation the increase in volume of the hot liquid,
and - on the other hand, the multi-branch star footprint which can, without modifying the flatness of the feet of the petaloid part, deform and accompany, by deforming inwards, the reduction in volume of the pasteurized liquid during its cooling , this ability to a controlled deformation of the central part of the bottom (substantially in the area of amorphous material) inducing a reduction of the deformation undergone simultaneously by the wall of the body of the container, which wall is, for this purpose, constituted in the form of juxtaposed panels; the consequence is that said panels provided on the wall of the body can be produced with a smaller surface, which leaves more freedom for the design of the entire container.
Les avantages exposés ci-dessus valent lorsque les récipients sont remplis d'un liquide plat (non gazéifié) pasteurisé.The advantages set out above apply when the containers are filled with a pasteurized flat (non-carbonated) liquid.
A fortiori ces avantages sont-ils valables également pour des récipients remplis d'un liquide pasteurisé contenant un gaz dissous sous pression (par exemple de la bière), ces récipients étant soumis additionnellement à la surpression des gaz chauffés au cours de la pasteurisation.A fortiori, these advantages are also valid for containers filled with a pasteurized liquid containing a gas dissolved under pressure (for example beer), these containers being additionally subjected to the overpressure of the gases heated during pasteurization.
On comprendra également que, étant aptes à subir sans dommage les effets de la pasteurisation, les récipients conformes à l'invention sont capables, a fortiori, de subir sans dommage un remplissage à chaud (remplissage avec un liquide chaud à une température au plus égale à environ 94°C).It will also be understood that, being capable of undergoing without damage the effects of pasteurization, the containers according to the invention are capable, a fortiori, of undergoing without damage a hot filling (filling with a hot liquid at a temperature at most equal at around 94 ° C).
En outre, on prend en compte le peu de place disponible sur le fond pour y former le motif pétaloïde et l'empreinte en croix multibranche, en combinant géométriquement les deux motifs avec les branches de l'empreinte en croix disposées en correspondance avec les pieds et alignées radialement respectivement avec ceux-ci.In addition, we take into account the little space available on the bottom to form the petaloid pattern and the multibranch crossprint, by geometrically combining the two patterns with the branches of the crossprint arranged in correspondence with the feet. and aligned radially with them respectively.
Enfin, du fait de la présence, dans chaque pied, d'une encoche d'absorption des contraintes agencée comme précité, lorsqu'un pied subit des contraintes, l'éventuelle déformation en résultant se situe au niveau de l'encoche qu'il comporte. Par ailleurs, l'encoche étant située entre deux saillies ou plots du pied par lesquels s'effectue l'appui du fond sur un support, on double ainsi les points d'appui, ce qui contribue à conférer une meilleure stabilité au récipient.Finally, due to the presence, in each foot, of a stress absorption notch arranged as above, when a foot is subjected to stresses, the possible deformation resulting therefrom is situated at the level of the notch which it includes. Furthermore, the notch being located between two projections or studs of the foot by which the support of the bottom is effected on a support, the support points are thus doubled, which contributes to giving better stability to the container.
Dans un mode de réalisation conférant une meilleure rigidité à la partie centrale du fond tout en lui assurant la déformabilité souhaitée nécessaire au but recherché dans le cadre de l'invention, il est souhaitable que la cuvette centrale sensiblement circulaire possède une profondeur sensiblement supérieure à celle des branches de l'empreinte en croix.In an embodiment conferring better rigidity on the central part of the bottom while ensuring it the desired deformability necessary for the aim sought in the context of the invention, it is desirable that the substantially circular central bowl has a depth substantially greater than that branches of the cross print.
De façon avantageuse, les portions de la paroi convexe du fond qui séparent deux pieds adjacents s'étendent entre les bras adjacents correspondants de l'empreinte en croix, jusque sensiblement au bord de la cuvette centrale. Mais pour éviter un affaiblissement central, il est préférable que les susdites portions de la paroi convexe du fond qui séparent deux pieds adjacents ne débouchent pas dans la cuvette centrale et que leur extrémité située radialement vers le centre reste séparée de la cuvette centrale par un rebord, lesquels rebords contribuent à rigidifier le pourtour du creux central.Advantageously, the portions of the convex wall of the bottom which separate two adjacent feet extend between the corresponding adjacent arms of the cross impression, up to substantially the edge of the central bowl. But to avoid a central weakening, it is preferable that the aforesaid portions of the convex wall of the bottom which separate two adjacent feet do not open into the central bowl and that their end situated radially towards the center remains separated from the central bowl by a rim , which edges contribute to stiffen the periphery of the central hollow.
La mise en oeuvre des dispositions conformes à l'invention nécessite d'établir un compromis pour parvenir à un fond de récipient qui possède les qualités recherchées. En effet, le fond pétaloïde peut, en principe, comporter un nombre quelconque, même élevé, de pieds. De même l'empreinte en creux en croix multibranche peut comporter, en principe, un nombre quelconque, même élevé, de branches. Toutefois, du fait que, conformément au mode de réalisation préféré de l'invention indiqué plus haut, les branches de l'empreinte en croix ont une étendue radiale qui les font arriver, en partie, dans l'amorce des pétales constituant les pieds et alors que, par ailleurs, les branches de l'empreinte en croix possèdent une largeur substantielle, il en résulte que, dans le récipient de l'invention, il n'est pas possible de prévoir un nombre substantiel de pieds et de branches de l'empreinte en croix. En pratique, ce nombre doit être supérieur à trois (nombre minimum pour assurer une assise stable du récipient), mais ne semble pas pouvoir dépasser cinq. En pratique le nombre de quatre semble correspondre au meilleur compromis.The implementation of the provisions according to the invention requires establishing a compromise to achieve a container bottom which has the desired qualities. In fact, the petaloid bottom can, in principle, include any number, even high, of feet. Likewise, the hollow imprint in a multibranch cross can in principle include any number, even high, of branches. However, the fact that, in accordance with the preferred embodiment of the invention indicated above, the branches of the cross impression have a radial extent which makes them arrive, in part, in the initiation of the petals constituting the feet and while, moreover, the branches of the cross impression have a substantial width, it follows that, in the container of the invention, it is not possible to provide a substantial number of feet and branches of the cross imprint. In practice, this number must be greater than three (minimum number to ensure a stable base of the container), but does not seem to be able to exceed five. In practice the number of four seems to correspond to the best compromise.
On notera également que l'épaisseur du fond ne doit pas être excessive, des essais ayant montré que des fonds épais conduisaient à de médiocres résultats.It should also be noted that the thickness of the bottom should not be excessive, tests having shown that thick bottoms lead to poor results.
A cet effet, on fera remarquer que l'épaisseur du fond du récipient agencé conformément à l'invention est sensiblement moindre que celle du fond à simple empreinte en croix multibranche prévu dans un récipient destiné au seul remplissage à chaud : la mise en oeuvre des dispositions de l'invention permet de réduire notablement la quantité de matière, de l'ordre de 20 à 30 % pour le fond seul et de l'ordre de 3 à 10 % pour l'ensemble du récipient, suivant le type de récipient. Il en résulte donc une économie d'argent substantielle, ce qui rend les dispositions de l'invention intéressantes ne serait-ce que pour la seule application de récipients appropriés au remplissage à chaud.To this end, it will be noted that the thickness of the bottom of the container arranged in accordance with the invention is significantly less than that of the bottom with a single multibranch cross impression provided in a container intended for hot filling only: the use of provisions of the invention can significantly reduce the amount of material, of the order of 20 to 30% for the bottom alone and of the order of 3 to 10% for the entire container, depending on the type of container. This therefore results in a substantial saving of money, which makes the provisions of the invention advantageous if only for the sole application of containers suitable for hot filling.
L'invention sera mieux comprise à la lecture de la description détaillée qui suit d'un mode de réalisation préféré donné uniquement à titre illustratif. Dans cette description, on se réfère aux dessins annexés sur lesquels :
- la figure 1 est une vue de dessous d'un fond de récipient agencé conformément à l'invention ;
- les figures 2A et 3A sont des vues en coupe diamétrale selon les lignes IIA-IIA et IIIA-IIIA, respectivement, de la figure 1 ;
- les figures 2B et 3B sont des vues de côté, respectivement selon les flèches IIB et IIIB de la figure 1, du fond de récipient de la figure 1 ;
- la figure 4 est une vue de trois-quarts par-dessous du fond de récipient des figures 1 à 3 ; et
- la figure 5 est une vue de trois-quarts pardessus du fond de récipient des figures 1 à 4, le corps de récipient étant supposé enlevé.
- Figure 1 is a bottom view of a container bottom arranged in accordance with the invention;
- FIGS. 2A and 3A are views in diametrical section along lines IIA-IIA and IIIA-IIIA, respectively, of FIG. 1;
- FIGS. 2B and 3B are side views, respectively according to arrows IIB and IIIB in FIG. 1, of the container bottom of FIG. 1;
- Figure 4 is a three-quarter view from below of the container bottom of Figures 1 to 3; and
- Figure 5 is a three-quarter view over the bottom of the container of Figures 1 to 4, the container body being assumed to be removed.
La description qui suit est relative plus spécifiquement, car il semble qu'il s'agisse d'une application préférée des dispositions de l'invention, à un agencement de fond de bouteille destinée à contenir un liquide, étant entendu que cet agencement peut cependant tout aussi bien concerner un récipient d'un autre type, tel que flacon, bidon.The description which follows relates more specifically, because it seems that this is a preferred application of the provisions of the invention, to a bottom arrangement of a bottle intended to contain a liquid, it being understood that this arrangement can however just as well relate to a container of another type, such as bottle, can.
L'invention s'intéresse à un récipient en matière thermoplastique, par exemple en PET, obtenu par soufflage ou étirage-soufflage d'une préforme préalablement obtenue par moulage.The invention relates to a container made of thermoplastic material, for example PET, obtained by blow molding or stretch blow molding of a preform previously obtained by molding.
La bouteille, désignée dans son ensemble par la référence 1 aux figures 2B et 3B (sur lesquelles seule la partie inférieure de la bouteille est visible), comporte une paroi latérale 2 et un fond 3 raccordé à cette dernière.The bottle, generally designated by the reference 1 in FIGS. 2B and 3B (in which only the lower part of the bottle is visible), has a side wall 2 and a bottom 3 connected to the latter.
Le fond 3 comporte, dans sa région centrale, une empreinte 4 en forme de croix multibranche imprimée en creux dans la face externe de la paroi de fond 5. L'empreinte en croix 4 comporte une cuvette centrale 6 sensiblement circulaire (qui se traduit par un plateau sensiblement rond 7 en saillie à l'intérieur de la bouteille) au centre de laquelle se trouve le bouton ou pastille 9 de matière correspondant, de façon connue, au logement du point d'injection de la préforme. Autour de la cuvette centrale 6 rayonnent les branches 8 d'étendue radiale réparties régulièrement.The bottom 3 has, in its central region, an imprint 4 in the form of a multibranch cross imprinted in the hollow on the external face of the bottom wall 5. The cross imprint 4 has a substantially circular central bowl 6 (which results in a substantially round plate 7 projecting inside the bottle) in the center of which is the button or pad 9 of material corresponding, in known manner, to the housing of the preform injection point. Around the central bowl 6 radiate the branches 8 of radial extent distributed regularly.
Dans l'exemple illustré, les branches 8 de l'empreinte en croix 4 sont au nombre de quatre, espacées mutuellement de 90°, pour une raison qui sera exposée plus loin.In the example illustrated, the branches 8 of the cross impression 4 are four in number, spaced apart by 90 °, for a reason which will be explained below.
Les branches 8 de l'empreinte en croix 4 ont des dimensions sensiblement importantes, avec un relief prononcé. Par exemple, les branches 8 ont des bords parallèles leur conférant une forme individuelle rectangulaire ou, comme illustré, des bords sensiblement divergents en direction de la périphérie leur conférant une forme sensiblement trapézoïdale. Leur longueur est approximativement double de leur largeur moyenne, et leur profondeur moyenne est approximativement moitié de leur largeur moyenne.The branches 8 of the cross impression 4 have substantially large dimensions, with a pronounced relief. For example, the branches 8 have parallel edges giving them an individual rectangular shape or, as illustrated, edges which are substantially divergent in the direction of the periphery giving them a substantially trapezoidal shape. Their length is approximately twice their average width, and their average depth is approximately half their average width.
L'empreinte en croix 4 est formée dans la région centrale de la paroi 5 de fond dans laquelle la matière thermoplastique est restée amorphe.The cross impression 4 is formed in the central region of the bottom wall 5 in which the thermoplastic material has remained amorphous.
Par ailleurs, le fond 3 est conformé selon le type dit "pétaloïde" avec la paroi de fond 5 ayant une forme générale convexe vers l'extérieur. Dans la paroi de fond 5 sont formées des excroissances 10 en saillie vers l'extérieur et situées vers la périphérie du fond ; plus exactement, la partie la plus saillante 11 des excroissances 10 est située au voisinage de la périphérie du fond tandis que les excroissances descendent en pente douce vers le centre du fond. Les excroissances 10 sont régulièrement réparties angulairement et sont séparées les unes des autres par une portion de paroi convexe de fond qui constitue une vallée 12 d'étendue radiale séparant deux excroissances adjacentes.Furthermore, the bottom 3 is shaped according to the so-called "petaloid" type with the bottom wall 5 having a generally convex shape towards the outside. In the bottom wall 5 are formed protuberances 10 projecting outwardly and located towards the periphery of the bottom; more precisely, the most projecting part 11 of the protuberances 10 is located in the vicinity of the periphery of the bottom while the protuberances descend in a gentle slope towards the center of the bottom. The protrusions 10 are regularly distributed angularly and are separated from each other by a portion of a convex bottom wall. which constitutes a valley 12 of radial extent separating two adjacent outgrowths.
Les excroissances 10 constituent des pieds dont la partie la plus saillante 11 est la zone d'appui par laquelle le récipient repose sur un support.The protrusions 10 constitute feet, the most projecting part 11 of which is the support zone by which the container rests on a support.
Comme illustré, les excroissances ou pieds 10 et les branches 8 de la croix formée par l'empreinte centrale 4 sont en nombre égal car, comme cela se voit particulièrement bien à la figure 1, les branches 8 de l'empreinte en croix sont engagées, au moins vers leurs extrémités respectives, dans les pieds 10, au moins dans la partie la moins saillante de ceux-ci. Autrement dit, les pieds 10 et les branches 8 non seulement sont en nombre égal, mais sont en outre mutuellement alignés radialement.As illustrated, the protrusions or feet 10 and the branches 8 of the cross formed by the central imprint 4 are in equal number because, as can be seen particularly well in FIG. 1, the branches 8 of the cross imprint are engaged , at least towards their respective ends, in the feet 10, at least in the least projecting part of these. In other words, the feet 10 and the branches 8 are not only equal in number, but are also mutually aligned radially.
Une telle conformation est, en pratique, imposée par la nécessité d'avoir au moins trois pieds pour que le récipient puisse reposer de façon stable sur un support et par la nécessité d'avoir des branches 8 de l'empreinte en croix 4 qui possèdent un relief et des dimensions substantiels, notamment pour ce qui est de leur largeur.Such a conformation is, in practice, imposed by the need to have at least three feet so that the container can rest stably on a support and by the need to have branches 8 of the cross impression 4 which have a relief and substantial dimensions, especially in terms of their width.
Il en résulte que le nombre des pieds, et donc le nombre des branches 8 de l'empreinte en croix 4 ne peut pas être moindre que trois, mais à l'inverse ne peut pas, en pratique, être trop élevé compte tenu des exigences d'obtention de formes correctes par soufflage lors de la fabrication.As a result, the number of feet, and therefore the number of branches 8 of the cross impression 4 cannot be less than three, but conversely cannot, in practice, be too high in view of the requirements obtaining correct shapes by blowing during manufacture.
En pratique, il semble que le nombre de quatre constitue un bon compromis, comme illustré sur les figures 1 à 5, pour une bouteille de dimensions standard.In practice, it seems that the number of four constitutes a good compromise, as illustrated in FIGS. 1 to 5, for a bottle of standard dimensions.
Pour que le fond 3 présente une bonne rigidité lors de son utilisation, tout en présentant une relative aptitude à la déformation en présence de liquide chaud, il est souhaitable de prévoir des éléments de renforcement appropriés.So that the bottom 3 has good rigidity during use, while having a relative aptitude for deformation in the presence of hot liquid, it it is desirable to provide suitable reinforcing elements.
Ainsi, il est avantageux que les portions de la paroi convexe ou vallées 12 qui séparent deux pieds adjacents s'étendent entre deux bras 8 consécutifs de l'empreinte centrale en croix jusque sensiblement au bord de la cuvette centrale 6, sans cependant déboucher dans celle-ci et en laissant subsister un léger rebord 15, formant armature, entre leur extrémité radialement intérieure et la cuvette centrale 6.Thus, it is advantageous that the portions of the convex wall or valleys 12 which separate two adjacent feet extend between two arms 8 consecutive of the central impression in the form of a cross until substantially at the edge of the central bowl 6, without however opening into that -this and leaving a slight rim 15 remaining, forming an armature, between their radially inner end and the central bowl 6.
De plus, la partie 11 la plus saillante des pieds 10 n'est pas lisse, mais présente une dépression ou encoche 13 à concavité tournée vers l'extérieur. Lorsque des contraintes sont subies par un pied 10, l'éventuelle déformation qui peut en résulter se situe alors au niveau de cette encoche 13, dite encoche d'absorption des contraintes.In addition, the most protruding part 11 of the feet 10 is not smooth, but has a depression or notch 13 with a concavity facing outwards. When stresses are undergone by a foot 10, the possible deformation which may result therefrom is then located at this notch 13, called the stress absorption notch.
De façon annexe, la présence de l'encoche d'absorption des contraintes 13 fait apparaître deux zones d'appui 11a et 11b situées de part et d'autre de celle-ci. Il en résulte un doublement des zones d'appui qui sont au nombre non pas de quatre (dans l'exemple considéré) correspondant au nombre de pieds, mais de huit. Il en résulte une meilleure stabilité du récipient reposant sur un support.In an annex, the presence of the stress absorption notch 13 reveals two support zones 11 a and 11 b located on either side thereof. This results in a doubling of the support zones which are not four (in the example considered) corresponding to the number of feet, but eight. This results in better stability of the container resting on a support.
Au surplus, cet agencement de chaque pied 10 fait apparaître un barreau transversal 14 entre l'extrémité radialement extérieure de chaque branche 8 de l'empreinte centrale en croix 4 et l'encoche d'absorption des contraintes 13 du pied 10 qui est située dans le prolongement de la précédente. Le barreau transversal 14 sert, d'une part, à rigidifier la partie en pente douce du pied 10 en entretoisant les deux bordures latérales d'étendue radiale du pied 10 et, sert, d'autre part, d'articulation à la partie centrale du fond rigidifié par l'empreinte en croix 4 lorsque cette partie centrale est aspirée vers l'intérieur lors du refroidissement du liquide. Cette faculté de mobilité contrôlée vers l'intérieur de la bouteille lors du refroidissement du récipient entraîne une moindre sollicitation des panneaux de la paroi du corps de la bouteille, autorisant ainsi une réduction de la surface desdits panneaux.In addition, this arrangement of each foot 10 shows a transverse bar 14 between the radially outer end of each branch 8 of the central cross-shaped imprint 4 and the stress absorption notch 13 of the foot 10 which is located in the extension of the previous one. The transverse bar 14 serves, on the one hand, to stiffen the gently sloping part of the foot 10 by bracing the two lateral edges of radial extent of the foot 10 and, on the other hand, serves as an articulation to the central part of the bottom stiffened by the cross impression 4 when this central part is sucked inwards during the cooling of the liquid. This faculty of mobility controlled towards the inside of the bottle during cooling of the container results in less stress on the panels of the wall of the body of the bottle, thus allowing a reduction in the surface of said panels.
La bouteille ainsi constituée peut supporter, sans déformation sensible de son fond, un processus de pasteurisation de son contenu liquide, qu'il s'agisse d'un liquide plat (par exemple jus de fruit) ou d'un liquide contenant du gaz dissous ou liquide carbonaté (par exemple bière). A fortiori, une telle bouteille peut supporter un processus de remplissage à chaud.The bottle thus formed can withstand, without appreciable deformation of its bottom, a process of pasteurization of its liquid content, whether it is a flat liquid (for example fruit juice) or a liquid containing dissolved gas. or carbonated liquid (for example beer). A fortiori, such a bottle can withstand a hot filling process.
On soulignera que le matériau constitutif du fond se présente sous une épaisseur relativement réduite, par rapport aux récipients antérieurs (par exemple réduction de l'ordre de 20 à 30 %). La bouteille de l'invention est, de ce point de vue, beaucoup plus intéressante que les actuelles bouteilles appropriées pour le remplissage à chaud, qui possèdent un fond sensiblement plus épais, dans le cas de bouteilles de même type.It will be emphasized that the material constituting the bottom has a relatively reduced thickness, compared to the previous containers (for example reduction of the order of 20 to 30%). The bottle of the invention is, from this point of view, much more advantageous than the current bottles suitable for hot filling, which have a substantially thicker bottom, in the case of bottles of the same type.
Claims (6)
- A thermoplastic container obtained by blow-molding or stretch-blow-molding of a preform, this container comprising a side wall (2) and a bottom (3) connected to this side wall, said bottom (3) comprising, in its central region, an impression (4) in the shape of a multi-branch cross impressed hollow into the outer face of the bottom wall (5), this cross-shaped impression (4) having a substantially circular central hollow (6) around which uniformly-spaced radially-extending branches (8) radiate,
characterized in that the bottom (3) is further of the petaloid type, with the bottom wall (5) having a shape generally outwardly convex with at least three feet (10) situated toward the periphery of the bottom and formed by uniformly angularly-spaced protrusions separated from one another by a convex wall portion (12) of the bottom,
in that there are equal numbers of feet (10) and branches (8) of the cross-shaped impression (4),
in that the branches (8) of the cross-shaped impression (4) are arranged to correspond with the feet (10) and aligned radially with respect to the latter,
in that each foot (10) has a stress-absorbing notch (13) in its bearing part (11), and
in that, in each foot, the stress-absorbing notch (13) remains radially separate from the end of the corresponding branch (8) of the cross-shaped impression (4). - The container as claimed in claim 1, characterized in that the substantially circular central cup (6) has a depth substantially greater than that of the branches (8) of the cross-shaped impression (4).
- The container as claimed in claim 2, characterized in that the portions (12) of the convex wall (5) of the bottom which separate two adjacent feet (10) extend between the corresponding adjacent branches (8) of the cross-shaped impression (4) substantially as far as the edge of the central cup (6).
- The container as claimed in claim 3, characterized in that said portions (12) of the convex wall (5) of the bottom which separate two adjacent legs (10) do not open into the central cup (6), and in that their end situated radially toward the center remains separated from the central cup (6) by a rim (15).
- The container as claimed in any one of claims 1 to 4, characterized in that, in each foot (10), the radially outer end of the branch (8) of the cross-shaped impression (4) and the stress-absorbing notch (13) are separated by a transverse strip (14).
- The container as claimed in any one of the preceding claims, characterized in that the bottom (3) has four feet (10), and in that the cross-shaped impression (4) is in the shape of a four branches cross (8).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0104516 | 2001-04-03 | ||
FR0104516A FR2822804B1 (en) | 2001-04-03 | 2001-04-03 | CONTAINER, ESPECIALLY BOTTLED, IN THERMOPLASTIC MATERIAL WHOSE BOTTOM HAS A CROSS FOOTPRINT |
PCT/FR2002/001134 WO2002081312A1 (en) | 2001-04-03 | 2002-04-02 | Thermoplastic container whereof the base comprises a cross-shaped impression |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1373076A1 EP1373076A1 (en) | 2004-01-02 |
EP1373076B1 true EP1373076B1 (en) | 2004-12-29 |
Family
ID=8861886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02722390A Expired - Lifetime EP1373076B1 (en) | 2001-04-03 | 2002-04-02 | Thermoplastic container whereof the base comprises a cross-shaped impression |
Country Status (14)
Country | Link |
---|---|
US (1) | US7051889B2 (en) |
EP (1) | EP1373076B1 (en) |
JP (1) | JP3741689B2 (en) |
KR (1) | KR100547665B1 (en) |
CN (1) | CN1236963C (en) |
AT (1) | ATE285945T1 (en) |
BR (1) | BR0208556B1 (en) |
CA (1) | CA2441593A1 (en) |
DE (1) | DE60202450T2 (en) |
ES (1) | ES2235031T3 (en) |
FR (1) | FR2822804B1 (en) |
MX (1) | MXPA03009067A (en) |
PT (1) | PT1373076E (en) |
WO (1) | WO2002081312A1 (en) |
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-
2001
- 2001-04-03 FR FR0104516A patent/FR2822804B1/en not_active Expired - Fee Related
-
2002
- 2002-04-02 MX MXPA03009067A patent/MXPA03009067A/en active IP Right Grant
- 2002-04-02 WO PCT/FR2002/001134 patent/WO2002081312A1/en active IP Right Grant
- 2002-04-02 EP EP02722390A patent/EP1373076B1/en not_active Expired - Lifetime
- 2002-04-02 AT AT02722390T patent/ATE285945T1/en not_active IP Right Cessation
- 2002-04-02 BR BRPI0208556-9A patent/BR0208556B1/en not_active IP Right Cessation
- 2002-04-02 US US10/472,388 patent/US7051889B2/en not_active Expired - Fee Related
- 2002-04-02 JP JP2002579314A patent/JP3741689B2/en not_active Expired - Fee Related
- 2002-04-02 ES ES02722390T patent/ES2235031T3/en not_active Expired - Lifetime
- 2002-04-02 CA CA002441593A patent/CA2441593A1/en not_active Abandoned
- 2002-04-02 DE DE60202450T patent/DE60202450T2/en not_active Expired - Lifetime
- 2002-04-02 PT PT02722390T patent/PT1373076E/en unknown
- 2002-04-02 KR KR1020037013054A patent/KR100547665B1/en not_active IP Right Cessation
- 2002-04-02 CN CNB02807615XA patent/CN1236963C/en not_active Expired - Fee Related
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BR0208556B1 (en) | 2012-05-29 |
JP2004524236A (en) | 2004-08-12 |
CA2441593A1 (en) | 2002-10-17 |
CN1500049A (en) | 2004-05-26 |
FR2822804A1 (en) | 2002-10-04 |
WO2002081312A1 (en) | 2002-10-17 |
US7051889B2 (en) | 2006-05-30 |
JP3741689B2 (en) | 2006-02-01 |
BR0208556A (en) | 2004-03-02 |
ES2235031T3 (en) | 2005-07-01 |
CN1236963C (en) | 2006-01-18 |
KR20030094324A (en) | 2003-12-11 |
EP1373076A1 (en) | 2004-01-02 |
PT1373076E (en) | 2005-05-31 |
FR2822804B1 (en) | 2004-06-04 |
US20040094502A1 (en) | 2004-05-20 |
DE60202450D1 (en) | 2005-02-03 |
KR100547665B1 (en) | 2006-01-31 |
DE60202450T2 (en) | 2006-02-09 |
ATE285945T1 (en) | 2005-01-15 |
MXPA03009067A (en) | 2004-02-17 |
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