EP0755351A1 - Container with a non-round follower plunger for pasty materials - Google Patents

Container with a non-round follower plunger for pasty materials

Info

Publication number
EP0755351A1
EP0755351A1 EP95916727A EP95916727A EP0755351A1 EP 0755351 A1 EP0755351 A1 EP 0755351A1 EP 95916727 A EP95916727 A EP 95916727A EP 95916727 A EP95916727 A EP 95916727A EP 0755351 A1 EP0755351 A1 EP 0755351A1
Authority
EP
European Patent Office
Prior art keywords
container
circle
curvature
arcs
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95916727A
Other languages
German (de)
French (fr)
Other versions
EP0755351B1 (en
Inventor
Pascal Pichonnier
Firmin Garcia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aptar France SAS
Original Assignee
Valois SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valois SAS filed Critical Valois SAS
Publication of EP0755351A1 publication Critical patent/EP0755351A1/en
Application granted granted Critical
Publication of EP0755351B1 publication Critical patent/EP0755351B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/02—Membranes or pistons acting on the contents inside the container, e.g. follower pistons
    • B05B11/028—Pistons separating the content remaining in the container from the atmospheric air to compensate underpressure inside the container

Definitions

  • Container for pasty products with non-round follower piston
  • the present invention relates to a container intended to contain a pasty product such as a cream, a gel or an emulsion. More particularly, said container is designed to be used in combination with a dispensing device of the type without air intake, that is to say that the volume of product extracted from the container by the dispensing device is not replaced. by the same volume of air.
  • a first consists in packaging the pasty product in a flexible bag which shrinks as and when the product is dispensed by the dispensing device which can be a pump, for example.
  • a second solution consists in equipping the container with a follower piston which rises in leaktight manner in the container by jerking a distance corresponding to the volume of product extracted from the container. This piston therefore follows the product in its reduction in volume.
  • the follower pistons like many other parts, are made by molding, by injecting a heated plastic material into a mold. As it cools, the plastic initially expanded, contracts, and thus creates shrinkage. This shrinkage is therefore a direct physical consequence of the heat loss due to the contact of the hot plastic with the colder mold. It must therefore be taken into account by the mold, so as to obtain a plastic part having the desired dimensions. To do this, the mold must be slightly larger than the desired final part to be able to reflect the shrinkage of material. In practice, the mold makers responsible for making the mold carry out the final sizing of the mold, taking account of the shrinkage by retouching using an appropriate tool, for example a wire EDM machine. This operation is carried out empirically until a mold with the appropriate dimensions is obtained, taking account of the shrinkage.
  • the retouching operation is relatively simple. Parts with axial symmetry such as the round piston are in fact injection molded in the center, i.e. the hot, pasty plastic material penetrates radially into the mold and reaches the end portions corresponding to the sealing lips of the piston. - follower at the same time. The shrinkage phenomenon then affects the molded part uniformly over its entire periphery. The retouching work is thus simplified, because it must be carried out uniformly on the periphery. The touch-up machine can then be easily programmed to work on a circle. This technique is well known in the prior art and specially adapted with regard to the dimensioning of molds for round follower pistons.
  • the subject of the present invention is a container intended to contain a pasty product, said container comprising an oblong cylindrical body surmounted by a neck intended to receive a distribution device of the type without air intake, said container comprising a sliding follower piston with sealed contact inside said oblong cylindrical body as the product is forced out of said container, characterized in that the follower piston has an outer contact periphery of oblong shape having two parts of greater curvature defined by a pair of arcs of circle of the same radius of curvature, said arcs of circle being arranged with respect to each other according to a first specular symmetry and connected to each other by two connecting segments.
  • the two connecting segments are each defined by at least one arc of a circle.
  • the connecting segments are defined by a pair of arcs of a circle with the same radius of curvature disposed relative to each other according to a second specular symmetry perpendicular to the first specular symmetry.
  • This definition of the connecting segments generates a perfectly oval shape with central symmetry. If touch-up work was also required on the connecting segments, this can be done by programming the touch-up machine on a corresponding curvature circle. Thus, by adjusting the touch-up machine only twice, perfect sizing of the piston-follower mold is obtained.
  • FIG. 1 is a profile section view of a pasty product dispenser incorporating the present invention
  • FIG. 2 is a front sectional view of a dispenser in FIG. 1,
  • FIG. 3 is a schematic representation of the outer contact periphery of a follower piston made in accordance with the present invention.
  • the dispenser of FIGS. 1 and 2 essentially consists of a container or reservoir 1 comprising an oblong cylindrical body of oval shape with central symmetry. This body is surmounted by a neck receiving a dispensing device which is here a pump 4. To protect this pump, a cap 5 is provided which caps the pump by snapping onto the container.
  • a pump 4 which a dispensing device which is here a pump 4.
  • a cap 5 is provided which caps the pump by snapping onto the container.
  • the object of the present invention not being linked to the very structure of the pump used, the latter will not be described in its constituent elements. However, the pump used is still of a certain type, in this case without air intake.
  • a follower piston 2 is provided in the container 1 to compensate for the volume of product dispensed by the pump.
  • a sealing base 3 further completes the container 1 by snap-fastening.
  • the follower piston 1 comprises a relatively flat wall 22 of oval shape which in fact forms the bottom of the container 1. This wall 22 extends substantially perpendicular to the axis of movement of the piston 2 in the container. Said wall 22 is surrounded by an oval sleeve, the upper and lower ends of which form two sealing lips 21 in sealed contact with the interior of the container 1. The outer contact periphery of the follower piston 2 is therefore delimited by said lips d sealing 21.
  • this external contact periphery 21 has two parts of greater curvature 21 ′ defined by a pair of arc of a circle with the same radius of curvature r arranged according to a first specular symmetry Sr. Furthermore, in the form of embodiment described here, these circular arcs of the same radius r are connected to each other by them connecting segments 21 "defined by another pair of circular arcs of the same other radius of curvature R greater than r and arranged according to a second specular symmetry SR perpendicular to Sr.
  • the external contact periphery 21 of the follower piston 1 is of perfectly oval shape with central symmetry, of course, the connection points of the various arcs of circle are such that the periphery is perfectly regular, that is to say that the values of the derivatives of the oval curve on either side of these connecting points are equal, that is to say the circles are tangent to the points of r accord.
  • the internal shape of the container is linked to the shape of the outer periphery 21 of the follower piston whose parts of greatest curvature are advantageously produced according to the invention with arcs of a circle.
  • the connecting segments 21 "are also arcs of a circle of radius R, but it goes without saying that other forms of segments 21" can be adopted without thereby departing from the scope of the present invention.
  • the segments may be straight lines connected to semicircles, which gives the outer contact periphery 21 a perfectly oblong shape, which amounts to making R tend towards infinity.
  • an outer contact periphery provides better sealing if it has a certain curvature towards the outside.
  • the ratio of the maximum dimension E to the minimum dimension e of the piston must be less than approximately three.

Abstract

A container (1) for a pasty material comprising an oblong cylindrical housing with a neck provided at the upper end thereof for connection to a dispensing device of the kind which does not replace the dispensed material with air. Said container (1) includes a follower plunger (2) which is slidable in sealing contact with the inside of said oblong cylindrical housing as the material is discharged from said container (1). Said follower plunger (2) has an oblong outer contact rim (21) consisting of two portions (21') having a relatively greater curvature and being defined by a pair of arcs of a circle that have the same radius of curvature and the same first mutual mirror symmetry (Sr) and are interconnected by connecting segments (21'). The connecting segments (21') are preferably defined by a pair of arcs of a circle that both have a radius of curvature different from the first and a second mutual mirror symmetry perpendicular to said first mirror symmetry (SR).

Description

Récipient pour produits pâteux à piston suiveur non rond. Container for pasty products with non-round follower piston.
La présente invention concerne un récipient destiné à contenir un produit pâteux tel qu'une crème, un gel ou une émulsion. Plus particulièrement, ledit récipient est conçu pour être utilisé en association avec un dispositif de distribution du type sans reprise d'air, c'est-à-dire que le volume de produit extirpé du récipient par le dispositif de distribution n'est pas remplacé par un même volume d'air. Dans ce cas, deux solutions son envisageables : une première consiste à conditionner le produit pâteux dans une poche souple qui se rétracte au fur et à mesure que du produit est distribué par le dispositif de distribution qui peut être une pompe, par exemple. Une deuxième solution consiste à équiper le récipient avec un piston suiveur qui remonte de façon étanche dans le récipient par à-coup d'une distance correspondant au volume de produit extrait du récipient. Ce piston suit donc le produit dans sa diminution de volume.The present invention relates to a container intended to contain a pasty product such as a cream, a gel or an emulsion. More particularly, said container is designed to be used in combination with a dispensing device of the type without air intake, that is to say that the volume of product extracted from the container by the dispensing device is not replaced. by the same volume of air. In this case, two solutions are possible: a first consists in packaging the pasty product in a flexible bag which shrinks as and when the product is dispensed by the dispensing device which can be a pump, for example. A second solution consists in equipping the container with a follower piston which rises in leaktight manner in the container by jerking a distance corresponding to the volume of product extracted from the container. This piston therefore follows the product in its reduction in volume.
Il est déjà connu de l'art antérieur d'équiper des récipients de section transversale ronde de tels pistons-suiveurs. La fabrication d'un moule à piston-suiveur rond ainsi que leur moulage ne présente aucune difficulté technique, étant donnée la symétrie parfaite de révolution de la pièce à mouler ainsi que du moule.It is already known in the prior art to equip receptacles of round cross section with such follower pistons. The production of a round piston-follower mold as well as their molding presents no technical difficulty, given the perfect symmetry of revolution of the part to be molded as well as of the mold.
Il est également connu de l'art antérieur de réaliser des récipients de section transversale autre que ronde. Ce type de récipient est plus particulièrement adapté à être utilisé avec un dispositif de distribution à reprise d'air ou un récipient à poche souple. Ceci s'explique par le fait qu'il est difficile de réaliser un piston-suiveur autre que rond, car le contact d'étanchéité entre la face interne du récipient et la lèvre de contact étanche du piston-suiveur n'est plus rond. Avec un piston rond, la force de contact étanche s'exerce radialement et uniformément sur la face interne du récipient. En revanche, avec un piston non rond, un ajustement parfait du contact étanche ainsi qu'une uniformité de force sur la périphérie interne de récipient ne peuvent être obtenus dans les mêmes conditions qu'avec un piston parfaitement rond.It is also known in the prior art to produce containers with a cross section other than round. This type of container is more particularly suitable for use with an air return distribution device or a flexible bag container. This is explained by the fact that it is difficult to produce a follower piston other than round, since the sealing contact between the internal face of the container and the sealed contact lip of the follower piston is no longer round. With a round piston, the sealed contact force is exerted radially and uniformly on the internal face of the container. On the other hand, with a non-round piston, a perfect adjustment of the tight contact as well as a uniformity of force on the internal periphery of the container cannot be obtained under the same conditions as with a perfectly round piston.
En effet, les pistons-suiveurs, comme beaucoup d'autres pièces, sont réalisés par moulage, en injectant une matière plastique chauffée dans un moule. En se refroidissant, la matière plastique initialement dilatée, se contracte, et crée ainsi un retrait de matière. Ce retrait est donc une conséquence physique directe de la perte thermique en raison du contact de la matière plastique chaude avec le moule plus froid. Il doit donc être pris en compte par le moule, de façon à obtenir une pièce en matière plastique ayant les cotes voulues. Pour ce faire, le moule doit être légèrement plus grand que la pièce finale voulue pour pouvoir répercuter le retrait de matière. Dans la pratique, les moulistes chargés de réaliser le moule effectuent le dimensionnement final du moule en tenant compte du retrait par retouche à l'aide d'un outillage approprié, par exemple une machine d'électro-érosion à fil. Cette opération s'effectue de façon empirique jusqu'à obtenir un moule ayant les cotes appropriées, compte tenu du retrait.Indeed, the follower pistons, like many other parts, are made by molding, by injecting a heated plastic material into a mold. As it cools, the plastic initially expanded, contracts, and thus creates shrinkage. This shrinkage is therefore a direct physical consequence of the heat loss due to the contact of the hot plastic with the colder mold. It must therefore be taken into account by the mold, so as to obtain a plastic part having the desired dimensions. To do this, the mold must be slightly larger than the desired final part to be able to reflect the shrinkage of material. In practice, the mold makers responsible for making the mold carry out the final sizing of the mold, taking account of the shrinkage by retouching using an appropriate tool, for example a wire EDM machine. This operation is carried out empirically until a mold with the appropriate dimensions is obtained, taking account of the shrinkage.
Dans le cas d'un piston-suiveur rond, l'opération de retouche est relativement simple. Les pièces à symétrie axiale tels que le piston rond sont en effet moulées par injection au centre, c'est-à-dire la matière plastique chaude et pâteuse pénètre radialement dans le moule et atteint les parties extrêmes correspondant aux lèvres d'étanchéité du piston-suiveur en même temps. Le phénomène de retrait affecte alors la pièce moulée uniformément sur toute sa périphérie. Le travail de retouche s'en trouve ainsi simplifiée, car il doit s'effectuer uniformément sur la périphérie. La machine de retouche peut alors être programmée de façon simple pour travailler sur un cercle. Cette technique est bien connue de l'art antérieur et spécialement adaptée en ce qui concerne le dimensionnement des moules de pistons-suiveurs ronds.In the case of a round follower piston, the retouching operation is relatively simple. Parts with axial symmetry such as the round piston are in fact injection molded in the center, i.e. the hot, pasty plastic material penetrates radially into the mold and reaches the end portions corresponding to the sealing lips of the piston. - follower at the same time. The shrinkage phenomenon then affects the molded part uniformly over its entire periphery. The retouching work is thus simplified, because it must be carried out uniformly on the periphery. The touch-up machine can then be easily programmed to work on a circle. This technique is well known in the prior art and specially adapted with regard to the dimensioning of molds for round follower pistons.
Dans le cas d'un piston-suiveur autre que rond, ce travail de retouche est également nécessaire. Cependant, il n'est plus possible de programmer la machine de retouche avec un parcours de travail aussi simple que le cercle. De plus, comme le piston n'est pas rond, la matière plastique, lors du moulage par injection au centre, n'atteint pas en même temps les parties extrêmes correspondant aux lèvres d'étanchéité. La matière plastique pâteuse doit effectuer un trajet à l'intérieur qui n'est pas radialement uniforme. Puisque le piston n'est pas rond, il y a nécessairement les parties extrêmes du moule qui sont plus éloignées que d'autres du centre par où s'effectue l'injection. Or, le phénomène de retrait de matière est proportionnel à l'épaisseur de la pièce. Les parties les plus éloignées du centre d'injection sont donc plus fortement affectées que les autres plus proches du centre d'injection par ce phénomène de retrait. Le travail de retouche est donc plus important sur ces parties éloignées du centre d'injection. La complexité de la forme ajoutée à la non-uniformité du phénomène de retrait rendent le travail de retouche quasiment impossible à effectuer. La machine de retouche devient improgrammable.In the case of a follower piston other than round, this retouching work is also necessary. However, it is no longer possible to program the touch-up machine with a work path as simple as the circle. In addition, as the piston is not round, the plastic material, during injection molding in the center, does not at the same time reach the end portions corresponding to the sealing lips. The pasty plastic must make an interior path which is not radially uniform. Since the piston is not round, there are necessarily the extreme parts of the mold which are more distant than others from the center where the injection takes place. However, the phenomenon of shrinkage of material is proportional to the thickness of the part. The parts furthest from the injection center are therefore more strongly affected than the others closest to the injection center by this withdrawal phenomenon. The retouching work is therefore more important on these parts distant from the injection center. The complexity of the form added to the non-uniformity of the shrinkage phenomenon make the retouching work almost impossible to perform. The retouching machine becomes improgrammable.
Le but de la présente invention est de remédier aux inconvénients susmentionnés inhérents à la fabrication de pistons-suiveurs non ronds. Pour ce faire, la présente invention a pour objet un récipient destiné à contenir un produit pâteux, ledit récipient comportant un corps cylindrique oblong surmonté d'un col destiné à recevoir un dispositif de distribution du type sans reprise d'air, ledit récipient comprenant un piston suiveur coulissant à contact étanche à l'intérieur dudit corps cylindrique oblong à mesure que le produit est refoulé hors dudit récipient, caractérisé en ce que le piston suiveur présente un pourtour extérieur de contact de forme oblongue présentant deux parties de plus forte courbure définies par une paire d'arcs de cercle de même rayon de courbure, lesdits arcs de cercle étant disposés l'un par rapport à l'autre selon une première symétrie spéculaire et raccordés l'un à l'autre par deux segments de raccordement. En réalisant le piston-suiveur de cette façon, on revient, en ce qui concerne les deux parties de plus forte courbure, au cas d'un piston parfaitement rond. La machine peut être programmée sur un cercle et travaillée sur un arc de cercle correspondant à la courbure desdites parties extrêmes. De plus, il n'est pratiquement nécessaire que de retoucher ces parties de plus forte courbure situées le plus en éloignement du centre d'injection, car les autres parties du moule ne subissent le phénomène de retrait que très faiblement. Ceci s'explique par le fait que l'épaisseur minimale d'un tel récipient est très largement inférieure au diamètre d'un récipient rond de même contenance. C'est pourquoi le phénomène de retrait n'affecte pour ainsi dire que les parties de plus forte courbure, qui elles seules nécessitent un travail de retouche.The object of the present invention is to remedy the aforementioned drawbacks inherent in the manufacture of non-round follower pistons. To do this, the subject of the present invention is a container intended to contain a pasty product, said container comprising an oblong cylindrical body surmounted by a neck intended to receive a distribution device of the type without air intake, said container comprising a sliding follower piston with sealed contact inside said oblong cylindrical body as the product is forced out of said container, characterized in that the follower piston has an outer contact periphery of oblong shape having two parts of greater curvature defined by a pair of arcs of circle of the same radius of curvature, said arcs of circle being arranged with respect to each other according to a first specular symmetry and connected to each other by two connecting segments. By making the follower piston in this way, we return, as regards the two parts of greater curvature, in the case of a perfectly round piston. The machine can be programmed on a circle and worked on an arc corresponding to the curvature of said end parts. In addition, it is practically only necessary to touch up these parts of greater curvature located furthest from the injection center, since the other parts of the mold only undergo the phenomenon of withdrawal very slightly. This is explained by the fact that the minimum thickness of such a container is very much less than the diameter of a round container of the same capacity. This is why the phenomenon of shrinkage only affects, so to speak, the parts with the greatest curvature, which alone require touch-up work.
Avantageusement, les deux segments de raccordement sont chacun définis par au moins un arc de cercle. De préférence, les segments de raccordement sont définis par une paire d'arcs de cercle de même rayon de courbure disposés l'un par rapport à l'autre selon une seconde symétrie spéculaire perpendiculaire à la première symétrie spéculaire. Cette définition des segments de raccordement engendre une forme parfaitement ovale à symétrie centrale. Au cas où un travail de retouche était également nécessaire sur les segments de raccordement, cela est possible en programmant la machine de retouche sur un cercle de courbure correspondante. Ainsi, en réglant la machine de retouche à deux reprises uniquement, un dimensionnement parfait du moule à piston-suiveur est obtenu. L'invention va maintenant être décrite en référence aux dessins annexés, donnant à titre d'exemple non limitatif, un mode de réalisation de l'invention. Sur les dessins :Advantageously, the two connecting segments are each defined by at least one arc of a circle. Preferably, the connecting segments are defined by a pair of arcs of a circle with the same radius of curvature disposed relative to each other according to a second specular symmetry perpendicular to the first specular symmetry. This definition of the connecting segments generates a perfectly oval shape with central symmetry. If touch-up work was also required on the connecting segments, this can be done by programming the touch-up machine on a corresponding curvature circle. Thus, by adjusting the touch-up machine only twice, perfect sizing of the piston-follower mold is obtained. The invention will now be described with reference to the accompanying drawings, giving by way of nonlimiting example, an embodiment of the invention. In the drawings:
- la figure 1 est une vue en coupe de profil d'un distributeur de produit pâteux incorporant la présente invention,FIG. 1 is a profile section view of a pasty product dispenser incorporating the present invention,
- la figure 2 est une vue en coupe de face d'un distributeur de la figure 1 ,FIG. 2 is a front sectional view of a dispenser in FIG. 1,
- la figure 3 est une représentation schématique du pourtour extérieur de contact d'un piston-suiveur réalisé conformément à la présente invention.- Figure 3 is a schematic representation of the outer contact periphery of a follower piston made in accordance with the present invention.
Le distributeur des figures 1 et 2 est essentiellement constitué d'un récipient ou réservoir 1 comportant un corps cylindrique oblong de forme ovale à symétrie centrale. Ce corps est surmonté d'un col recevant un dispositif de distribution qui est ici une pompe 4. Pour protéger cette pompe, il est prévu un capuchon 5 qui coiffe la pompe en s'encliquetant sur le récipient. L'objet de la présente invention n'étant pas lié à la structure même de la pompe utilisée, cette dernière ne sera pas décrite dans ses éléments constitutifs. Cependant, la pompe utilisée est tout de même d'un certain type, en l'occurrence sans reprise d'air. Pour cela, un piston-suiveur 2 est prévu dans le récipient 1 afin de compenser le volume de produit distribué par la pompe. Un culot d'obturation 3 vient en outre compléter le récipient 1 par encliquetage. A chaque relâchement du poussoir 41 de la pompe 4, la chambre de pompe se remplit d'une dose de produit d'un certain volume. Simultanément au remplissage de la chambre de pompe, le piston-suiveur 2 remonte dans le récipient 1 en direction de la pompe sur une distance correspondant au volume de la dose prélevée. Le piston-suiveur 1 comprend une paroi 22 relativement plane de forme ovale qui réalise en fait le fond du récipient 1. Cette paroi 22 s'étend sensiblement perpendiculairement à l'axe de déplacement du piston 2 dans le récipient. Ladite paroi 22 est entourée par un manchon ovale dont le extrémités supérieures et inférieures forment deux lèvres d'étanchéité 21 en contact étanche avec l'intérieur du récipient 1. Le pourtour extérieur de contact du piston-suiveur 2 est donc délimité par lesdites lèvres d'étanchéité 21.The dispenser of FIGS. 1 and 2 essentially consists of a container or reservoir 1 comprising an oblong cylindrical body of oval shape with central symmetry. This body is surmounted by a neck receiving a dispensing device which is here a pump 4. To protect this pump, a cap 5 is provided which caps the pump by snapping onto the container. The object of the present invention not being linked to the very structure of the pump used, the latter will not be described in its constituent elements. However, the pump used is still of a certain type, in this case without air intake. For this, a follower piston 2 is provided in the container 1 to compensate for the volume of product dispensed by the pump. A sealing base 3 further completes the container 1 by snap-fastening. Each time the plunger 41 of the pump 4 is released, the pump chamber is filled with a dose of product of a certain volume. Simultaneously with the filling of the pump chamber, the follower piston 2 rises in the container 1 in the direction of the pump over a distance corresponding to the volume of the dose withdrawn. The follower piston 1 comprises a relatively flat wall 22 of oval shape which in fact forms the bottom of the container 1. This wall 22 extends substantially perpendicular to the axis of movement of the piston 2 in the container. Said wall 22 is surrounded by an oval sleeve, the upper and lower ends of which form two sealing lips 21 in sealed contact with the interior of the container 1. The outer contact periphery of the follower piston 2 is therefore delimited by said lips d sealing 21.
Selon l'invention, ce pourtour extérieur de contact 21 présente deux parties de plus forte courbure 21 ' définies par une paire d'arc de cercle de même rayon de courbure r disposés selon une première symétrie spéculaire Sr. En outre, dans la forme de réalisation ici décrite, ces arcs de cercle de même rayon r sont raccordés l'un à l'autre par eux segments de raccordement 21 " définis par une autre paire d'arcs de cercle de même autre rayon de courbure R supérieure à r et disposés selon une seconde symétrie spéculaire SR perpendiculaire à Sr. Ainsi, le pourtour extérieur de contact 21 du piston-suiveur 1 est de forme parfaitement ovale à symétrie centrale. Bien entendu, les points de raccordement des différents arcs de cercle sont tels que le pourtour 21 est parfaitement régulier, c'est-à- dire que les valeurs des dérivées de la courbe ovale de part et d'autre de ces points de raccordement sont égales, c'est-à-dire les cercles sont tangents aux points de raccordement.According to the invention, this external contact periphery 21 has two parts of greater curvature 21 ′ defined by a pair of arc of a circle with the same radius of curvature r arranged according to a first specular symmetry Sr. Furthermore, in the form of embodiment described here, these circular arcs of the same radius r are connected to each other by them connecting segments 21 "defined by another pair of circular arcs of the same other radius of curvature R greater than r and arranged according to a second specular symmetry SR perpendicular to Sr. Thus, the external contact periphery 21 of the follower piston 1 is of perfectly oval shape with central symmetry, of course, the connection points of the various arcs of circle are such that the periphery is perfectly regular, that is to say that the values of the derivatives of the oval curve on either side of these connecting points are equal, that is to say the circles are tangent to the points of r accord.
Pour des questions de facilité de retouche du moule précédemment exposées, la forme intérieure du récipient est liée à la forme du pourtour extérieur 21 du piston-suiveur dont les parties de plus forte courbure sont avantageusement réalisées selon l'invention avec des arcs de cercle. Dans la forme de réalisation décrite, les segments de raccordement 21 " sont également des arcs de cercle de rayon R, mais il va de soi que d'autres formes de segments 21" peuvent être adoptés sans pour cela sortir du cadre de la présente invention. Par exemple, les segments peuvent être des droites raccordées à des demi-cercles, ce qui confère au pourtour extérieur de contact 21 une forme parfaitement oblongue, ce qui revient à faire tendre R vers l'infini. Cependant, il est préférable que tout le pourtour extérieur de contact 21 soit réalisé avec les segments d'arc de cercle jointifs. En effet, un pourtour extérieur de contact offre une meilleure étanchéité si elle présente une certaine courbure vers l'extérieur. On sait qu'il est plus difficile de réaliser une bonne étanchéité sur des portions rectilignes de lèvres d'étanchéité de piston suiveur, car la lèvre n'est pas contrainte contre la surface intérieure plate du récipient dans lequel le piston coulisse.For questions of ease of touching up the mold previously exposed, the internal shape of the container is linked to the shape of the outer periphery 21 of the follower piston whose parts of greatest curvature are advantageously produced according to the invention with arcs of a circle. In the embodiment described, the connecting segments 21 "are also arcs of a circle of radius R, but it goes without saying that other forms of segments 21" can be adopted without thereby departing from the scope of the present invention. . For example, the segments may be straight lines connected to semicircles, which gives the outer contact periphery 21 a perfectly oblong shape, which amounts to making R tend towards infinity. However, it is preferable for the entire outer contact periphery 21 to be made with the contiguous circular arc segments. Indeed, an outer contact periphery provides better sealing if it has a certain curvature towards the outside. We know that it is more difficult to achieve a good seal on straight portions of the follower piston sealing lips, since the lip is not forced against the flat interior surface of the container in which the piston slides.
Par expérience, il a été constaté que, pour garantir un bon maintien du piston 2 dans le récipient 1 , le rapport de la dimension maximale E à la dimension minimale e du piston devait être inférieur à environ trois. From experience, it has been found that, in order to guarantee good retention of the piston 2 in the container 1, the ratio of the maximum dimension E to the minimum dimension e of the piston must be less than approximately three.

Claims

Revendications claims
1.- Récipient (1) destiné à contenir un produit pâteux, ledit récipient (1) comportant un corps cylindrique oblong surmonté d'un col destiné à recevoir un dispositif de distribution du type sans reprise d'air, ledit récipient (1) comprenant un piston suiveur (2) coulissant à contact étanche à l'intérieur dudit corps cylindrique oblong à mesure que le produit est refoulé hors dudit récipient (1), caractérisé en ce que le piston suiveur (2) présente un pourtour extérieur de contact (21) de forme oblongue présentant deux parties de plus forte courbure (21 ') définies par une paire d'arcs de cercle de même rayon de courbure, lesdits arcs de cercle étant disposés l'un par rapport à l'autre selon une première symétrie spéculaire (Sr) et raccordés l'un à l'autre par deux segments de raccordement (21").1.- container (1) intended to contain a pasty product, said container (1) comprising an oblong cylindrical body surmounted by a neck intended to receive a distribution device of the type without air intake, said container (1) comprising a follower piston (2) sliding with sealed contact inside said oblong cylindrical body as the product is forced out of said container (1), characterized in that the follower piston (2) has an outer contact periphery (21 ) of oblong shape having two parts of greater curvature (21 ') defined by a pair of arcs of circle of the same radius of curvature, said arcs of circle being arranged relative to each other according to a first specular symmetry (Sr) and connected to each other by two connecting segments (21 ").
2.- Récipient selon la revendication 1 , dans lequel les deux segments de raccordement (21 ") sont chacun définis par au moins un arc de cercle.2.- container according to claim 1, wherein the two connecting segments (21 ") are each defined by at least one arc of a circle.
3.- Récipient selon la revendication 1 ou la revendication 2, dans lequel les segments de raccordement (21") sont définis par une paire d'arcs de cercle de même autre rayon de courbure disposés l'un par rapport à l'autre selon une seconde symétrie spéculaire perpendiculaire à la première symétrie spéculaire (SR). 3.- container according to claim 1 or claim 2, wherein the connecting segments (21 ") are defined by a pair of arcs of circle of the same other radius of curvature arranged relative to each other according to a second specular symmetry perpendicular to the first specular symmetry (SR).
EP95916727A 1994-04-12 1995-04-07 Container with a non-round follower plunger for pasty materials Expired - Lifetime EP0755351B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9404293A FR2718417B1 (en) 1994-04-12 1994-04-12 Container for pasty products with non-round follower piston.
FR9404293 1994-04-12
PCT/FR1995/000451 WO1995027664A1 (en) 1994-04-12 1995-04-07 Container with a non-round follower plunger for pasty materials

Publications (2)

Publication Number Publication Date
EP0755351A1 true EP0755351A1 (en) 1997-01-29
EP0755351B1 EP0755351B1 (en) 1998-07-08

Family

ID=9461986

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Application Number Title Priority Date Filing Date
EP95916727A Expired - Lifetime EP0755351B1 (en) 1994-04-12 1995-04-07 Container with a non-round follower plunger for pasty materials

Country Status (6)

Country Link
US (1) US5961005A (en)
EP (1) EP0755351B1 (en)
JP (1) JPH09511723A (en)
DE (1) DE69503367T2 (en)
FR (1) FR2718417B1 (en)
WO (1) WO1995027664A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69919326T2 (en) * 1999-05-07 2005-09-08 Airlessystems Snapped dispenser with a follower piston
WO2005113379A1 (en) * 2004-05-06 2005-12-01 Rexam Dispensing Smt Closure device for a non-vented liquid product dispenser
FR2903672B1 (en) * 2006-07-11 2008-09-12 Oreal DOUBLE ENVELOPE PACKAGING DEVICE
FR2961736B1 (en) * 2010-06-23 2012-08-03 Airlessystems METHOD AND MOLD FOR MANUFACTURING A TANK FOR SLIDING AND FOLLOWING PISTON.
US11382400B2 (en) 2018-08-10 2022-07-12 Go Products Co. Material applicator

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR653310A (en) * 1927-04-23 1929-03-20 Removable bottle for various uses, in particular usable as a worker bottle
DE3708704A1 (en) * 1987-03-18 1988-09-29 Fischbach A Kunststoff Kg MEASURING CARTRIDGE FOR PASTOESE
DE8815089U1 (en) * 1988-12-03 1990-03-29 Schuckmann, Alfred Von, 4178 Kevelaer, De
FR2674024B1 (en) * 1991-03-11 1994-03-11 Daniel Crosnier METERING DEVICE ADAPTABLE TO VARIOUS CONTAINERS.
DE69218066D1 (en) * 1991-07-29 1997-04-17 Aka Innovative Dev Storage and dispensing device for liquid or pasty products
US5449094A (en) * 1992-05-18 1995-09-12 Sofab Dispenser with plunging sleeve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9527664A1 *

Also Published As

Publication number Publication date
DE69503367D1 (en) 1998-08-13
JPH09511723A (en) 1997-11-25
DE69503367T2 (en) 1999-04-15
WO1995027664A1 (en) 1995-10-19
US5961005A (en) 1999-10-05
EP0755351B1 (en) 1998-07-08
FR2718417A1 (en) 1995-10-13
FR2718417B1 (en) 1996-06-14

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