EP0409750A1 - Method for inserting a tight-fitting piston into a tubular, cylindrical body and the corresponding device - Google Patents

Method for inserting a tight-fitting piston into a tubular, cylindrical body and the corresponding device Download PDF

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Publication number
EP0409750A1
EP0409750A1 EP90420342A EP90420342A EP0409750A1 EP 0409750 A1 EP0409750 A1 EP 0409750A1 EP 90420342 A EP90420342 A EP 90420342A EP 90420342 A EP90420342 A EP 90420342A EP 0409750 A1 EP0409750 A1 EP 0409750A1
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EP
European Patent Office
Prior art keywords
piston
cover
tubular body
sliding
diameter
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.)
Ceased
Application number
EP90420342A
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German (de)
French (fr)
Inventor
Bernard Schneider
Roland Fiorini
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.)
Albea Tubes France SAS
Original Assignee
Cebal SAS
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Filing date
Publication date
Application filed by Cebal SAS filed Critical Cebal SAS
Publication of EP0409750A1 publication Critical patent/EP0409750A1/en
Ceased 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
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00576—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container
    • B05C17/00579—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container comprising means for allowing entrapped air to escape to the atmosphere
    • 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
    • B05B11/0005—Components or details
    • B05B11/0097—Means for filling or refilling the sprayer
    • 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
    • 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
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/0005—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container

Definitions

  • the present invention relates to a method of evacuating air during the introduction into a sealed tubular body, for example the rigid or semi-rigid body of a container or a dispenser, of a lid sliding therein. waterproof way.
  • the first object of the invention is a method of introducing a sealed sliding cover into a cylindrical tubular body using a pushing means pressing on the reverse face of the cover, characterized in that it is pressed said pushing means on said reverse side so as to obtaining a folding of said cover when the pressure of the air trapped in said body increases, this trapped air then escaping between the cover and said body.
  • the pressure of the occluded air is the factor triggering this mechanism thus allowing a complete or almost complete air purge by successive air passages and more and more close together when the seal approaches the bottom or the contained product, whatever whatever the speed of insertion of the cover.
  • the support of the reverse side of the cover must be such that it is capable of causing folding or bending of this cover under the effect of the pressure of the trapped air which is exerted on the front face. .
  • the method applies to any seal with leaktight sliding, this seal being transverse relative to the cylindrical tubular body in which it is pushed. It applies in particular to a sliding piston whose sealed sliding means are constituted by a flexible flared peripheral lip of overall diameter in the free state greater than the diameter of the tubular body, this difference in diameter allowing a slight forcing and the sealed support of the peripheral lip being typically 0.2 to 0.8 mm high, while the front face of the piston constituting the cover is typically made of plastic with a thickness of between 0.6 and 1.4 mm .
  • This cover is light and deformable under the pressure exerted by the air trapped on its reverse side.
  • the bearing surface of the pushing means on the reverse face of the cover comprises, at the time of a deformation allowing the trapped air to pass, both areas of initial support, without back pressure of this air, and areas of additional support often in the extension of the previous ones and having as main characteristic to be initially less than 1.5 mm from the reverse side.
  • these additional support zones correspond to surfaces with a radius of curvature of 8 mm or more of the pusher, surfaces extending the initial support surfaces of the pusher on said reverse face of the cover.
  • a tighter definition of the support range can use the zones with an initial distance of less than 1 mm, instead of 1.5 mm.
  • the support range of the pushing means being defined in this way to fix rules relating to the effectiveness of this support, it is noted that this support range comprising one or more continuous or discontinuous support zones gives a rigid support of the reverse side of the cover, the elongated edges of which favor folding of this cover.
  • this support range is as follows: - in the case where the cover, for example the front face of a sliding piston, is circular, the bearing surface of the means for pushing the cover has an overall length at least equal to 0.6 times and preferably 0.7 times the overall diameter of the cover, and an overall width at most equal to 0.5 times and preferably between 0.1 times and 0.4 times said overall diameter ; - in the particular case where the cover has a central recess opening onto its front face, this recess serving for example to fit a pump of a distributor at the end of the travel of the cover, the support range of the pushing means comprises support zones located on either side of said central recess and, to further promote folding of the cover, said support area does not extend transversely from the central recess.
  • the reverse side of the lid can include recesses or inclined parts, the pusher having a suitable front face and the preceding rules being understood as projection on a plane perpendicular to the axis of the system.
  • this process can operate at various introduction speeds, but if the speed is high, for example more than 40 to 80 mm / s as is usual in packaging plants, there are corresponding jolts. air exhaust trips whenever the corresponding pressure of the occluded air or "critical exhaust pressure" is reached. Furthermore, it is necessary to ensure a deceleration to stop at the chosen distance, and this preferably by pushing back this product to completely eliminate the occluded air then fill the compression chamber and thus ensure or facilitate the initiation of the distribution.
  • the thrust speed is thus reduced to less than 30 mm / s from 1 mm or more distance between the front face of the sliding piston and the product contained.
  • This speed limitation distance is advantageously from 1 to 5 mm.
  • the product contained is then approached when it is creamy or pasty, with a thrust speed of 10 to 30 mm / s, and the plunger is pushed further into the product until initiating the dispensing, that is to say for example until the product fills the compression chamber of the dispenser and exceeds the expulsion valve.
  • a thrust speed 10 to 30 mm / s
  • the plunger is pushed further into the product until initiating the dispensing, that is to say for example until the product fills the compression chamber of the dispenser and exceeds the expulsion valve.
  • the distributor with a rigid or semi-rigid body is equipped with a distribution pump, and more particularly with a pump without air return of principle known by documents EP-A-0143183 and EP-A- 0251863, the product contained being a liquid or a fluid cream
  • the installation of a sliding piston according to the methods of the invention the trapped air escaping even at a low speed of the piston, makes it possible to reduce the volume trapped air to a minimum.
  • this foot made of relatively flexible plastic material, for example PE, comprises an annular fold which is transversely deformable, preferably fitting the end of the tubular body with clamping, this foot having in its central part an air passage hole and the external part to this fold being of small width, so that the foot adapts equally well to slight ovalizations or variations in diameter of the end of the body only slight misalignments of the casing of this end by said added foot.
  • PE relatively flexible plastic material
  • a second object of the invention is the device for introducing a piston sliding in leaktight manner inside the cylindrical tubular body of a container, in the case where the front part of this piston is bordered by a peripheral lip. flared flexible entering with a slight forcing in the tubular body of the container.
  • the invention makes it possible to avoid any internal pollution of the sliding piston.
  • Figures 1 and 2 show a pusher 1 in PA6 fixed to an introduction rod 2 pushing a sliding piston 3 of height 15 mm inside the cylindrical tubular body 4, of internal diameter 52 mm and thickness 0.5 mm, of a distributor, this body 4 being filled with pasty product 5 up to 30 to 32 mm from the open lower end 6 of the tubular body 4.
  • the distributor is in the inverted position for filling and closing by the piston 3, the open end 6 being in the high position.
  • the front veil 7 of the sliding piston 3 which is made of HDPE 0.9 mm thick, it comprises on the reverse side a central plate 8 of 25 mm diameter surrounded by a frustoconical portion 9 at 15 ° with the plate 8 extending to an internal diameter 48 mm followed by a short cylindrical portion at the foot of which is located the flexible peripheral sealing lip 10 slightly flared.
  • This thinned lip 10 at its end has an inside diameter of 51 mm at its base and an outside diameter of tip or overall diameter of 53.5 mm in the free state.
  • the height between the end of the lip 10 and the end of the semi-rigid guide lip 11 at the rear of the sliding piston 3 is 13 mm.
  • the pusher 1 has a length of 44 mm along the plane of Figure 2 and a width of 14 mm along the plane of Figure 1 perpendicular to the plane of Figure 2, the connections between length and width being made at a radius of 7 mm.
  • the initial support zone 12 of the pusher on the back 13 of the veil 7 is 8 ⁇ 12 mm.
  • the width of the support area will vary by less than 1 mm due to the small radii of curvature of the surfaces bordering the initial support area of width 8 mm, as seen in Figure 1.
  • the support range of the pusher dynamic or efficient, then has approximately 8.5 ⁇ 40 mm, while the diameter of the cover or front sail 7 of the piston 3 is 50 mm.
  • the pusher 1 was introduced into the body 4 to 60 mm / s and stopped when its front was 46 mm lower than the open end 6 of the tubular body 4. It was found that from halfway down this descent air was expelled along the inner wall of the cylindrical body 4. The advance was then resumed at 15 mm / s by stopping the sliding piston 38mm lower. It was found that the pasty product had been discharged into the compression chamber of the distributor without there being any escape of this product around the periphery of the piston 3, and that then the emptying of the distributor gave no bubbles or irregularity due to occluded air. The interpretation is as follows: the residual air is effectively expelled by the mechanism of the invention even over a short distance, and the seal against the pasty product due to the peripheral lip 10 is then restored for the discharge of this pasty product 5.
  • FIG. 4 shows the pusher 100 bearing on the reverse face 21 of the piston 30 and deforming it as a result of the increase in pressure of the air 14 trapped between the piston 30 and the tubular body with an internal diameter of 51 mm.
  • This pusher 100 introduced at 20 mm / s and stopped within the pasty product gives, like the previous one, good evacuation of the air which is trapped between the sliding piston 30 and the pasty product 5.
  • FIG. 6 represents an introduction device comprising an annular inlet part 4 22 fixed to operating rods 23 placing it in place on the end of a distributor body, this part 22 comprising a frustoconical interior surface 24 of which the lower end 25 has an internal diameter of 50.8 mm, and having a centering provided by its outer skirt 26.
  • Air passages 27 having the form of recesses communicating the outside of the tubular body 4 with the gap 28 comprised between the frustoconical inner veil 29 of the part 22 and this body 4 are provided on the periphery of this annular part 22.
  • This entry piece 22 was used to introduce sliding pistons 3 into bodies 4 up to 1 to 2 mm from the pasty product, by pushing them with a circular pusher with a diameter of 30 mm at 60 mm / s, then used in recovery a pusher identical to that of Example 1 by driving the pasty product at 20 mm / s up to 3 to 4 mm from its filling level.
  • the use of the distributors thus pre-primed did not give any irregularity.
  • the two preceding introduction phases can be carried out with the same pusher 1 according to the invention (FIG. 6) by means of an appropriate command 2 and 31.
  • the invention applies mainly to distributors of cosmetic, pharmaceutical, hygienic and food products.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Closures For Containers (AREA)
  • Sealing Of Jars (AREA)

Abstract

The subject of the invention is a method for inserting such a piston (7) with the aid of a thrust means (1) bearing on the inside face of the said piston (7), in which this thrust means (1) bears so as to obtain folding of the said piston (7) when the pressure of the air trapped in the said body (4) increases, this air then escaping between the piston (7) and the said body (4). <??>A further subject of the invention is the corresponding device. It applies to the fields of cosmetic, pharmaceutical, hygiene and food products. <IMAGE>

Description

La présente invention concerne un procédé d'évacuation de l'air lors de l'introduction dans un corps tubulaire étanche, par exemple le corps rigide ou semi-rigide d'un récipient ou d'un distributeur, d'un opercule y coulissant de façon étanche.The present invention relates to a method of evacuating air during the introduction into a sealed tubular body, for example the rigid or semi-rigid body of a container or a dispenser, of a lid sliding therein. waterproof way.

Le document FR-B-2605983=EP-A-270467=US-A-4809887 décrit un procédé d'introduction d'un piston glissant dans un corps de distributeur rempli de produit pâteux, dans lequel la lèvre d'étanchéité située à l'avant du piston est rétreinte par passage à travers une zone d'entrée évasée suivie d'un relief transversal de diamètre minimal inférieur de 0,3 à 1,5 mm au diamètre intérieur dudit corps. Ce rétreint de la lèvre crée des petites ondulations ou frisures par lesquelles s'échappe l'air emprisonné entre le piston et le produit pâteux et il faut une vitesse d'avance du piston d'au moins 40 mm/s pour que ces ondulations se maintiennent sous l'effet des passages d'air.Document FR-B-2605983 = EP-A-270467 = US-A-4809887 describes a method of introducing a sliding piston into a distributor body filled with pasty product, in which the sealing lip located at the 'before the piston is shrunk by passing through a flared entry area followed by a transverse relief of minimum diameter less than 0.3 to 1.5 mm to the inner diameter of said body. This constriction of the lip creates small undulations or crimps through which the air trapped between the piston and the pasty product escapes and a piston advance speed of at least 40 mm / s is necessary for these undulations to keep under the effect of air passages.

Lorsque la vitesse du piston diminue, les petites ondulations s'effacent et l'air ne passe plus, de sorte qu'en pratique il reste un petit peu d'air occlus correspondant au ralentissement et à l'arrêt du piston. Par ailleurs, la solution d'un relief transversal intérieur s'applique surtout à des corps tubulaires en matière plastique, et la création d'un tel relief au moyen d'un pied rapporté bien qu'elle convienne à d'autres natures de corps est une complication pour le stockage et la fabrication en série de distributeurs.When the speed of the piston decreases, the small undulations disappear and the air does not pass any more, so that in practice there remains a little bit of occluded air corresponding to the deceleration and the stop of the piston. In addition, the solution of an internal transverse relief applies especially to tubular plastic bodies, and the creation of such a relief by means of an attached foot although it is suitable for other types of body. is a complication for storage and mass production of dispensers.

La demanderesse a cherché à mettre au point une solution qui évite de tels inconvénients.The Applicant has sought to develop a solution which avoids such disadvantages.

EXPOSE DE L'INVENTIONSTATEMENT OF THE INVENTION

L'invention a pour premier objet un procédé d'introduction d'un opercule à coulissement étanche dans un corps tubulaire cylindrique à l'aide d'un moyen de poussée appuyant sur la face envers de l'opercule, caractérisé en ce que on appuie ledit moyen de poussée sur ladite face envers de façon à obtenir un pliage dudit opercule lorsque la pression de l'air emprisonné dans ledit corps augmente, cet air emprisonné s'échappant alors entre l'opercule et ledit corps.The first object of the invention is a method of introducing a sealed sliding cover into a cylindrical tubular body using a pushing means pressing on the reverse face of the cover, characterized in that it is pressed said pushing means on said reverse side so as to obtaining a folding of said cover when the pressure of the air trapped in said body increases, this trapped air then escaping between the cover and said body.

La solution ainsi mise au point est particulièrement simple. On s'est aperçu que pour un opercule tel que la face avant d'un piston glissant introduit dans un corps tubulaire cylindrique à fond fermé ou rempli d'un produit, l'avancement de l'opercule appuyé par une partie seulement de sa surface envers entraînait pour une certaine avance de cet opercule un échappement d'air entre sa périphérie et le corps tubulaire. Si on s'arrête alors et qu'on poursuit l'introduction du piston, l'échappement d'air se produit à nouveau mais pour un avancement plus faible de l'opercule. Il se produit une déformation plus ou moins prononcée de l'opercule, lorsque la pression de l'air emprisonné augmente, cette déformation entraînant des décollements locaux ou des modifications d'appui des moyens d'étanchéité contre la paroi intérieure du corps tubulaire, permettant à l'air emprisonné de passer. La pression de l'air occlus est le facteur déclenchant ce mécanisme permettant donc une purge d'air complète ou quasi complète par passages d'air successifs et de plus en plus rapprochés lorsque l'opercule se rapproche du fond ou du produit contenu, quelle que soit la vitesse d'introduction de l'opercule. L'appui de la face envers de l'opercule doit être tel qu'il soit susceptible d'entraîner un pliage ou une flexion de cet opercule sous l'effet de la pression de l'air emprisonné qui s'exerce sur la face avant.The solution thus developed is particularly simple. It has been found that for a cover such as the front face of a sliding piston introduced into a cylindrical tubular body with closed bottom or filled with a product, the advancement of the cover supported by only part of its surface upside caused for a certain advance of this cover an air escape between its periphery and the tubular body. If we then stop and continue the introduction of the piston, the air exhaust occurs again but for a lower advancement of the seal. A more or less pronounced deformation of the cover occurs, when the pressure of the trapped air increases, this deformation causing local detachments or changes in the support of the sealing means against the inner wall of the tubular body, allowing trapped air to pass. The pressure of the occluded air is the factor triggering this mechanism thus allowing a complete or almost complete air purge by successive air passages and more and more close together when the seal approaches the bottom or the contained product, whatever whatever the speed of insertion of the cover. The support of the reverse side of the cover must be such that it is capable of causing folding or bending of this cover under the effect of the pressure of the trapped air which is exerted on the front face. .

Le procédé s'applique à tout opercule à coulissement étanche, cet opercule étant transversal par rapport au corps tubulaire cylindrique dans lequel il est poussé. Il s'applique en particulier à un piston glissant dont les moyens de coulissement étanche sont constitués par une lèvre périphérique évasée souple de diamètre hors-tout à l'état libre supérieur au diamètre du corps tubulaire, cette différence de diamètre permettant un léger forcement et l'appui étanche de la lèvre périphérique étant typiquement de hauteur 0,2 à 0,8 mm, tandis que la face avant du piston constituant l'opercule est typiquement en matière plastique d'épaisseur comprise entre 0,6 et 1,4 mm.The method applies to any seal with leaktight sliding, this seal being transverse relative to the cylindrical tubular body in which it is pushed. It applies in particular to a sliding piston whose sealed sliding means are constituted by a flexible flared peripheral lip of overall diameter in the free state greater than the diameter of the tubular body, this difference in diameter allowing a slight forcing and the sealed support of the peripheral lip being typically 0.2 to 0.8 mm high, while the front face of the piston constituting the cover is typically made of plastic with a thickness of between 0.6 and 1.4 mm .

Cet opercule est léger et déformable sous la pression qu'exerce l'air emprisonné sur sa face envers. La plage d'appui du moyen de poussée sur la face envers de l'opercule, habituellement par l'intermédiaire d'un embout ou poussoir, comprend, au moment d'une déformation permettant à l'air emprisonné de passer, à la fois des zones d'appui initial, sans contre-pression de cet air, et des zones d'appui supplémentaire souvent dans le prolongement des précédentes et ayant comme principale caractéristique de se trouver initialement à moins de 1,5 mm de la face envers.
Selon des configurations fréquentes, ces zones d'appui supplémentaires correspondent à des surfaces de rayon de courbure de 8 mm ou plus du poussoir, surfaces prolongeant les surfaces d'appui initial du poussoir sur ladite face envers de l'opercule. Une définition plus serrée de la plage d'appui peut utiliser les zones de distance initiale inférieure à 1 mm, au lieu de 1,5 mm.This cover is light and deformable under the pressure exerted by the air trapped on its reverse side. The bearing surface of the pushing means on the reverse face of the cover, usually by means of a nozzle or push rod, comprises, at the time of a deformation allowing the trapped air to pass, both areas of initial support, without back pressure of this air, and areas of additional support often in the extension of the previous ones and having as main characteristic to be initially less than 1.5 mm from the reverse side.
According to frequent configurations, these additional support zones correspond to surfaces with a radius of curvature of 8 mm or more of the pusher, surfaces extending the initial support surfaces of the pusher on said reverse face of the cover. A tighter definition of the support range can use the zones with an initial distance of less than 1 mm, instead of 1.5 mm.

La plage d'appui des moyens de poussée étant définie de la sorte pour fixer des règles relatives à l'efficacité de cet appui, on remarque que cette plage d'appui comprenant une ou plusieurs zones d'appui continues ou discontinues donne un appui rigide de la face envers de l'opercule dont les bords allongés favorisent le pliage de cet opercule.The support range of the pushing means being defined in this way to fix rules relating to the effectiveness of this support, it is noted that this support range comprising one or more continuous or discontinuous support zones gives a rigid support of the reverse side of the cover, the elongated edges of which favor folding of this cover.

Les configurations préférées de cette plage d'appui sont les suivantes :
- dans le cas où l'opercule, par exemple la face avant d'un piston glissant, est circulaire, la plage d'appui du moyen de poussée de l'opercule a une longueur hors-tout au moins égale à 0,6 fois et de préférence 0,7 fois le diamètre hors-tout de l'opercule, et une largeur hors-tout au plus égale à 0,5 fois et de préférence comprise entre 0,1 fois et 0,4 fois ledit diamètre hors-tout;
- dans le cas particulier où l'opercule comporte un creux central débouchant sur sa face avant, ce creux servant par exemple à emboîter une pompe d'un distributeur en fin de course de l'opercule, la plage d'appui du moyen de poussée comprend des zones d'appui situées de part et d'autre dudit creux central et, pour favoriser encore davantage le pliage de l'opercule, ladite plage d'appui ne déborde pas transversalement du creux central. La face envers de l'opercule peut comporter des décrochements ou des parties inclinées, le poussoir ayant une face avant adaptée et les règles précédentes s'entendant en projection sur un plan perpendiculaire à l'axe du système.The preferred configurations of this support range are as follows:
- in the case where the cover, for example the front face of a sliding piston, is circular, the bearing surface of the means for pushing the cover has an overall length at least equal to 0.6 times and preferably 0.7 times the overall diameter of the cover, and an overall width at most equal to 0.5 times and preferably between 0.1 times and 0.4 times said overall diameter ;
- in the particular case where the cover has a central recess opening onto its front face, this recess serving for example to fit a pump of a distributor at the end of the travel of the cover, the support range of the pushing means comprises support zones located on either side of said central recess and, to further promote folding of the cover, said support area does not extend transversely from the central recess. The reverse side of the lid can include recesses or inclined parts, the pusher having a suitable front face and the preceding rules being understood as projection on a plane perpendicular to the axis of the system.

Dans la pratique, ce procédé peut fonctionner à des vitesses d'introduction variées, mais si la vitesse est élevée par exemple de plus de 40 à 80 mm/s comme cela est habituel dans les usines de conditionnement, on observe des à-coups correspondant aux déclenchements de l'échappement d'air chaque fois que la pression correspondante de l'air occlus ou "pression critique d'échappement" est atteinte. Par ailleurs, il faut assurer un ralentissement pour s'arrêter à la distance choisie, et cela de préférence en repoussant ce produit pour éliminer complètement l'air occlus puis remplir la chambre de compression et assurer ou faciliter ainsi l'amorçage de la distribution.In practice, this process can operate at various introduction speeds, but if the speed is high, for example more than 40 to 80 mm / s as is usual in packaging plants, there are corresponding jolts. air exhaust trips whenever the corresponding pressure of the occluded air or "critical exhaust pressure" is reached. Furthermore, it is necessary to ensure a deceleration to stop at the chosen distance, and this preferably by pushing back this product to completely eliminate the occluded air then fill the compression chamber and thus ensure or facilitate the initiation of the distribution.

Dans le cas d'un piston glissant, on a alors mis au point une variante du procédé de l'invention : dans le cas où le corps tubulaire, typiquement celui d'un distributeur, contient un produit liquide, crémeux ou pâteux, l'opercule étant la partie frontale d'un piston glissant bordé d'une lèvre périphérique évasée souple, on rétreint progressivement cette lèvre à un diamètre inférieur d'au moins 0,6 mm au diamètre de coulissement du corps tubulaire au début de l'enfournement du piston glissant, la vitesse de poussée du piston glissant étant alors supérieure à 40 mm/s, de façon à assurer à une telle vitesse l'évacuation de l'air emprisonné dès le début dudit enfoncement, selon le principe connu par le document EP-A-270467. On diminue alors le temps total d'enfoncement du piston glissant, le nouveau mécanisme de fuite d'air n'intervenant qu'à partir du ralentissement en-dessous de 40 mm/s.In the case of a sliding piston, a variant of the process of the invention has then been developed: in the case where the tubular body, typically that of a distributor, contains a liquid, creamy or pasty product, the cover being the front part of a sliding piston bordered by a flexible flared peripheral lip, this lip is gradually constricted to a diameter at least 0.6 mm less than the sliding diameter of the tubular body at the start of the charging of the sliding piston, the thrust speed of the sliding piston then being greater than 40 mm / s, so as to ensure at such a speed the evacuation of the trapped air from the start of said depression, according to the principle known from document EP- A-270467. The total time of insertion of the sliding piston is then reduced, the new air leakage mechanism only intervening from the deceleration below 40 mm / s.

De préférence, la vitesse de poussée est ainsi diminuée jusqu'à moins de 30 mm/s à partir de 1 mm ou plus de distance entre face avant du piston glissant et produit contenu. Cette distance de limitation de la vitesse est avantageusement de 1 à 5 mm.Preferably, the thrust speed is thus reduced to less than 30 mm / s from 1 mm or more distance between the front face of the sliding piston and the product contained. This speed limitation distance is advantageously from 1 to 5 mm.

De préférence encore, on approche ainsi du produit contenu lorsqu'il est crémeux ou pâteux, avec une vitesse de poussée de 10 à 30 mm/s, et l'enfoncement du piston est poursuivi dans le produit jusqu'à amorcer la distribution, c'est-à-dire par exemple jusqu'à ce que le produit remplisse la chambre de compression du distributeur et dépasse la valve d'expulsion. Grâce au mécanisme d'évacuation de l'air de l'invention, cette procédure assure une évacuation très poussée de l'air en même temps qu'un amorçage des moyens de distribution. Dans le cas où le distributeur à corps rigide ou semi-rigide est équipé d'une pompe de distribution, et plus particulièrement d'une pompe sans retour d'air de principe connu par les documents EP-A-0143183 et EP-A-0251863, le produit contenu étant un liquide ou une crème fluide, la mise en place d'un piston glissant selon les modalités de l'invention, l'air emprisonné s'échappant même à une vitesse faible du piston, permet de réduire le volume d'air emprisonné à un minimum.More preferably, the product contained is then approached when it is creamy or pasty, with a thrust speed of 10 to 30 mm / s, and the plunger is pushed further into the product until initiating the dispensing, that is to say for example until the product fills the compression chamber of the dispenser and exceeds the expulsion valve. Thanks to the air evacuation mechanism of the invention, this procedure ensures a very thorough evacuation of the air at the same time as priming of the distribution means. In the case where the distributor with a rigid or semi-rigid body is equipped with a distribution pump, and more particularly with a pump without air return of principle known by documents EP-A-0143183 and EP-A- 0251863, the product contained being a liquid or a fluid cream, the installation of a sliding piston according to the methods of the invention, the trapped air escaping even at a low speed of the piston, makes it possible to reduce the volume trapped air to a minimum.

Après introduction du piston, la protection de l'arrière du piston est souvent réalisée au moyen d'un pied rapporté. La demanderesse a mis au point un pied rapporté particulièrement intéressant par sa facilité de mise en place : ce pied en matière plastique relativement souple, par exemple du PE, comporte un pli annulaire déformable transversalement emboîtant de préférence avec serrage l'extrémité du corps tubulaire, ce pied ayant dans sa partie centrale un trou de passage de l'air et la partie extérieure à ce pli étant de faible largeur, de sorte que le pied s'adapte aussi bien à de légères ovalisations ou variations de diamètre de l'extrémité du corps qu'à de légers désaxages de l'emboîtage de cette extrémité par ledit pied rapporté.After insertion of the piston, protection of the rear of the piston is often achieved by means of an attached foot. The Applicant has developed a particularly interesting added foot by its ease of installation: this foot made of relatively flexible plastic material, for example PE, comprises an annular fold which is transversely deformable, preferably fitting the end of the tubular body with clamping, this foot having in its central part an air passage hole and the external part to this fold being of small width, so that the foot adapts equally well to slight ovalizations or variations in diameter of the end of the body only slight misalignments of the casing of this end by said added foot.

L'invention a pour deuxième objet le dispositif d'introduction d'un piston glissant de façon étanche à l'intérieur du corps tubulaire cylindrique d'un récipient, dans le cas où la partie frontale de ce piston est bordée d'une lèvre périphérique évasée souple entrant avec un léger forcement dans le corps tubulaire du récipient. Les caractéristiques de ce dispositif ressortent de la description du procédé faite ci-dessus ainsi que des Exemples qui vont suivre.A second object of the invention is the device for introducing a piston sliding in leaktight manner inside the cylindrical tubular body of a container, in the case where the front part of this piston is bordered by a peripheral lip. flared flexible entering with a slight forcing in the tubular body of the container. The characteristics of this device appear from the description of the process given above as well as from the Examples which follow.

Outre une solution simple des difficultés signalées, l'invention permet d'éviter toute pollution intérieure du piston glissant.In addition to a simple solution to the difficulties mentioned, the invention makes it possible to avoid any internal pollution of the sliding piston.

EXEMPLESEXAMPLES

  • La figure 1 représente en coupe axiale un piston glissant en cours d'introduction selon l'invention dans un corps tubulaire rempli de produit pâteux.Figure 1 shows in axial section a sliding piston during introduction according to the invention in a tubular body filled with pasty product.
  • La figure 2 représente, à 90° de la figure 1 (coupe AA), l'extrémité agissante du moyen de poussée en appui sur la face envers de l'avant du piston glissant.Figure 2 shows, at 90 ° from Figure 1 (section AA), the active end of the thrust means bearing on the reverse side of the front of the sliding piston.
  • La figure 3 représente un deuxième moyen de poussée sur le point d'être appliqué sur la face envers de la face avant d'un deuxième piston glissant, celui-ci comportant un creux central en forme de puits, selon une demi-coupe axiale.FIG. 3 represents a second pushing means about to be applied to the reverse side of the front face of a second sliding piston, the latter comprising a central hollow in the form of a well, in an axial half-section.
  • La figure 4 représente le même moyen de poussée en appui sur la même face envers, avec déformation de cette face.FIG. 4 represents the same pushing means pressing on the same reverse face, with deformation of this face.
  • La figure 5 est une coupe transversale du même moyen de poussée.Figure 5 is a cross section of the same pushing means.
  • La figure 6 représente un dispositif selon l'invention comportant une pièce annulaire d'entrée, en coupe axiale.FIG. 6 represents a device according to the invention comprising an annular entry piece, in axial section.
Exemple 1Example 1

les figures 1 et 2 représentent un poussoir 1 en PA6 fixé à une tige d'introduction 2 poussant un piston glissant 3 de hauteur 15 mm à l'intérieur du corps tubulaire cylindrique 4, de diamètre intérieur 52 mm et d'épaisseur 0,5 mm, d'un distributeur, ce corps 4 étant rempli de produit pâteux 5 jusqu'à 30 à 32 mm de l'extrémité inférieure ouverte 6 du corps tubulaire 4. Le distributeur est en position renversée pour son remplissage et sa fermeture par le piston 3, l'extrémité ouverte 6 étant en position haute. Le voile avant 7 du piston glissant 3 qui est en PE.HD a 0,9 mm d'épaisseur, il comporte du côté envers un plat central 8 de diamètre 25 mm entouré d'une portion tronconique 9 à 15° avec le plat 8 s'étendant jusqu'à un diamètre intérieur 48 mm suivi d'une courte portion cylindrique au pied de laquelle se situe la lèvre périphérique souple d'étanchéité 10 légèrement évasée. Cette lèvre 10 amincie à son extrémité a un diamètre intérieur de 51 mm à sa base et un diamètre extérieur de pointe ou diamètre hors tout de 53,5 mm à l'état libre. La hauteur entre extrémité de la lèvre 10 et extrémité de la lèvre de guidage semi-rigide 11 à l'arrière du piston glissant 3 est de 13 mm. Le poussoir 1 a une longueur de 44 mm selon le plan de la figure 2 et une largeur de 14 mm selon le plan de la figure 1 perpendiculaire au plan de la figure 2, les raccordements entre longueur et largeur se faisant selon un rayon de 7 mm. La zone d'appui initial 12 du poussoir sur l'envers 13 du voile 7 est de 8x12 mm. Lorsque l'engagement du piston glissant 3 sera plus prononcé, la pression de l'air emprisonné 14 augmentant sur sa face avant, des zones d'appui supplémentaires apparaîtront par suite de la déformation du voile avant 7, correspondant à des points tels que 15 et 16 repérés sur la face avant du poussoir 1 (figure 2). La largeur de la zone d'appui variera de moins de 1 mm en raison des rayons de courbure faibles des surfaces bordant la zone d'appui initial de largeur 8 mm, selon la vue de la figure 1. La plage d'appui du poussoir, en dynamique ou efficace, a alors environ 8,5x40 mm, alors que le diamètre de l'opercule ou voile avant 7 du piston 3 est de 50 mm.Figures 1 and 2 show a pusher 1 in PA6 fixed to an introduction rod 2 pushing a sliding piston 3 of height 15 mm inside the cylindrical tubular body 4, of internal diameter 52 mm and thickness 0.5 mm, of a distributor, this body 4 being filled with pasty product 5 up to 30 to 32 mm from the open lower end 6 of the tubular body 4. The distributor is in the inverted position for filling and closing by the piston 3, the open end 6 being in the high position. The front veil 7 of the sliding piston 3 which is made of HDPE 0.9 mm thick, it comprises on the reverse side a central plate 8 of 25 mm diameter surrounded by a frustoconical portion 9 at 15 ° with the plate 8 extending to an internal diameter 48 mm followed by a short cylindrical portion at the foot of which is located the flexible peripheral sealing lip 10 slightly flared. This thinned lip 10 at its end has an inside diameter of 51 mm at its base and an outside diameter of tip or overall diameter of 53.5 mm in the free state. The height between the end of the lip 10 and the end of the semi-rigid guide lip 11 at the rear of the sliding piston 3 is 13 mm. The pusher 1 has a length of 44 mm along the plane of Figure 2 and a width of 14 mm along the plane of Figure 1 perpendicular to the plane of Figure 2, the connections between length and width being made at a radius of 7 mm. The initial support zone 12 of the pusher on the back 13 of the veil 7 is 8 × 12 mm. When the engagement of the sliding piston 3 is more pronounced, the pressure of the trapped air 14 increasing on its front face, additional support zones will appear as a result of the deformation of the front sail 7, corresponding to points such as 15 and 16 marked on the front face of pusher 1 (FIG. 2). The width of the support area will vary by less than 1 mm due to the small radii of curvature of the surfaces bordering the initial support area of width 8 mm, as seen in Figure 1. The support range of the pusher , dynamic or efficient, then has approximately 8.5 × 40 mm, while the diameter of the cover or front sail 7 of the piston 3 is 50 mm.

Le poussoir 1 a été introduit dans le coprs 4 à 60 mm/s et arrêté lorsque son avant était 46 mm plus bas que l'extrémité ouverte 6 du corps tubulaire 4. On a constaté qu'à partir de mi-chemin de cette descente de l'air était expulsé le long de la paroi intérieure du corps cylindrique 4. On a ensuite repris l'avance à 15 mm/s en arrêtant le piston glissant 3 8mm plus bas. On a constaté que le produit pâteux avait été refoulé dans la chambre de compression du distributeur sans qu'il y ait d'échappement de ce produit sur le pourtour du piston 3, et que ensuite le vidage du distributeur n'a donné aucune bulle ou irrégularité imputable à de l'air occlus. L'interprétation est la suivante : l'air résiduel est efficacement expulsé par le mécanisme de l'invention même sur une petite distance, et l'étanchéité au produit pâteux due à la lèvre périphérique 10 est ensuite rétablie pour le refoulement de ce produit pâteux 5.The pusher 1 was introduced into the body 4 to 60 mm / s and stopped when its front was 46 mm lower than the open end 6 of the tubular body 4. It was found that from halfway down this descent air was expelled along the inner wall of the cylindrical body 4. The advance was then resumed at 15 mm / s by stopping the sliding piston 38mm lower. It was found that the pasty product had been discharged into the compression chamber of the distributor without there being any escape of this product around the periphery of the piston 3, and that then the emptying of the distributor gave no bubbles or irregularity due to occluded air. The interpretation is as follows: the residual air is effectively expelled by the mechanism of the invention even over a short distance, and the seal against the pasty product due to the peripheral lip 10 is then restored for the discharge of this pasty product 5.

Exemple 2Example 2

Les figures 3 à 5 illustrent la mise en oeuvre de l'invention dans le cas d'un piston glissant 30 comportant un puits central 17 de diamètre intérieur 8 mm sur sa face avant. Le poussoir 100 fixé à la tige d'introduction 20 a une section axiale en U de largeur 8 mm et de longueur hors tout 48 mm, ses deux branches d'appui 18 et 19 étant écartées de 12 mm (figure 5). La figure 4 montre le poussoir 100 en appui sur la face envers 21 du piston 30 et le déformant par suite de l'augmentation de pression de l'air 14 emprisonné entre le piston 30 et le corps tubulaire de diamètre intérieur 51 mm. Ce poussoir 100 introduit à 20 mm/s et arrêté au sein du produit pâteux donne comme le précédent une bonne évacuation de l'air qui est emprisonné entre le piston glissant 30 et le produit pâteux 5.Figures 3 to 5 illustrate the implementation of the invention in the case of a sliding piston 30 having a central well 17 of inner diameter 8 mm on its front face. The pusher 100 fixed to the introduction rod 20 has an axial U-shaped section of width 8 mm and length overall 48 mm, its two support arms 18 and 19 being spaced 12 mm apart (Figure 5). FIG. 4 shows the pusher 100 bearing on the reverse face 21 of the piston 30 and deforming it as a result of the increase in pressure of the air 14 trapped between the piston 30 and the tubular body with an internal diameter of 51 mm. This pusher 100 introduced at 20 mm / s and stopped within the pasty product gives, like the previous one, good evacuation of the air which is trapped between the sliding piston 30 and the pasty product 5.

Exemple 3Example 3

La figure 6 représente un dispositif d'introduction comportant une pièce annulaire 4 d'entrée 22 fixée à des tiges de manoeuvre 23 la mettant en place sur l'extrémité d'un corps de distributeur, cette pièce 22 comportant une surface intérieure tronconique 24 dont l'extrémité inférieure 25 a un diamètre intérieur de 50,8 mm, et ayant un centrage assuré par sa jupe extérieure 26. Des passages d'air 27 ayant la forme de chambrages faisant communiquer l'extérieur du corps tubulaire 4 avec l'interstice 28 compris entre le voile intérieur tronconique 29 de la pièce 22 et ce corps 4 sont prévus sur le pourtour de cette pièce annulaire 22.FIG. 6 represents an introduction device comprising an annular inlet part 4 22 fixed to operating rods 23 placing it in place on the end of a distributor body, this part 22 comprising a frustoconical interior surface 24 of which the lower end 25 has an internal diameter of 50.8 mm, and having a centering provided by its outer skirt 26. Air passages 27 having the form of recesses communicating the outside of the tubular body 4 with the gap 28 comprised between the frustoconical inner veil 29 of the part 22 and this body 4 are provided on the periphery of this annular part 22.

On a utilisé cette pièce d'entrée 22 pour introduire des pistons glissants 3 dans des corps 4 jusqu'à 1 à 2 mm du produit pâteux, en les poussant avec un poussoir circulaire de diamètre 30 mm à 60 mm/s, puis on a utilisé en reprise un poussoir identique à celui de l'Exemple 1 en refoulant le produit pâteux à 20 mm/s jusqu'à 3 à 4 mm à partir de son niveau de remplissage. L'utilisation des distributeurs ainsi pré-amorcés n'a donné aucune irrégularité.This entry piece 22 was used to introduce sliding pistons 3 into bodies 4 up to 1 to 2 mm from the pasty product, by pushing them with a circular pusher with a diameter of 30 mm at 60 mm / s, then used in recovery a pusher identical to that of Example 1 by driving the pasty product at 20 mm / s up to 3 to 4 mm from its filling level. The use of the distributors thus pre-primed did not give any irregularity.

Les deux phases d'introduction qui précèdent peuvent être réalisées avec un même poussoir 1 selon l'invention (figure 6) moyennant une commande appropriée 2 et 31.The two preceding introduction phases can be carried out with the same pusher 1 according to the invention (FIG. 6) by means of an appropriate command 2 and 31.

APPLICATIONSAPPLICATIONS

L'invention s'applique principalement à des distributeurs de produits cosmétique, pharmaceutique, hygiénique et alimentaires.The invention applies mainly to distributors of cosmetic, pharmaceutical, hygienic and food products.

Claims (11)

1. Procédé d'introduction d'un opercule (7) à coulissement étanche dans un corps tubulaire cylindrique (4) à l'aide d'un moyen de poussée (1; 100) appuyant sur la face envers (13;21) de l'opercule (7), caractérisé en ce que on appui ledit moyen de poussée (1; 100) sur ladite face envers (13;21) de façon à obtenir un pliage dudit opercule (7) lorsque la pression de l'air emprisonné (14) dans ledit corps (4) augmente, cet air emprisonné (14) s'échappant alors entre l'opercule (7) et ledit corps (4).1. Method for introducing a sealing slide (7) into a cylindrical tubular body (4) using a pushing means (1; 100) pressing on the reverse side (13; 21) of the cover (7), characterized in that said thrust means (1; 100) is supported on said reverse face (13; 21) so as to obtain a folding of said cover (7) when the pressure of the trapped air (14) in said body (4) increases, this trapped air (14) then escaping between the cover (7) and said body (4). 2. Procédé selon la revendication 1, dans lequel ledit opercule (7) est la partie frontale (7) d'un piston glissant (3;30), les moyens de coulissement étanche dudit opercule étant constitués par une lèvre périphérique évasée souple (10) de diamètre hors tout à l'état libre supérieur au diamètre de coulissement dudit corps tubulaire (4).2. Method according to claim 1, in which said cover (7) is the front part (7) of a sliding piston (3; 30), the means for sealingly sliding said cover being constituted by a flexible flared peripheral lip (10 ) overall diameter in the free state greater than the sliding diameter of said tubular body (4). 3. Procédé selon l'une quelconque des revendications 1 ou 2, dans lequel ledit opercule (7) est circulaire, la plage d'appui dudit moyen de poussée comprenant des zones d'appui initial (12) sur ladite face envers de l'opercule et des zones (15;16) écartées initialement de moins de 1,5 mm de ladite face envers (13), ladite plage d'appui ayant une longueur hors tout au moins égale à 0,6 fois le diamètre hors tout dudit opercule (7), et une largeur hors tout au plus égale à 0,5 fois ledit diamètre hors tout.3. Method according to any one of claims 1 or 2, wherein said cover (7) is circular, the support area of said pushing means comprising initial support areas (12) on said reverse side of the cover and zones (15; 16) initially spaced less than 1.5 mm from said reverse face (13), said support area having an overall length at least equal to 0.6 times the overall diameter of said cover (7), and an overall width at most equal to 0.5 times said overall diameter. 4. Procédé selon la revendication 3, dans lequel ladite largeur hors tout de ladite plage d'appui est comprise entre 0,1 fois et 0,4 fois ledit diamètre hors tout.4. The method of claim 3, wherein said overall width of said bearing range is between 0.1 times and 0.4 times said overall diameter. 5. Procédé selon l'une quelconque des revendications 3 ou 4, dans lequel ledit opercule comporte un creux central (17) débouchant sur sa face avant, ladite plage d'appui du moyen de poussée (100) comprenant des zones d'appui situées de part et d'autre dudit creux central (17).5. Method according to any one of claims 3 or 4, wherein said cover comprises a central recess (17) opening on its front face, said bearing surface of the thrust means (100) comprising bearing zones located on either side of said central hollow (17). 6. Procédé selon l'une quelconque des revendications 2 à 5 dépendant de la revendication 2, dans le cas où ledit corps tubulaire (4) contient un produit liquide crémeux ou pâteux (5) et dans lequel on rétreint progressivement ladite lèvre périphérique (10) de ladite partie frontale (7) du piston glissant (3;30) à un diamètre inférieur d'au moins 0,6 mm au diamètre de coulissement dudit corps tubulaire (4) au début de l'enfoncement dudit piston glissant (23;30), la vitesse de poussée dudit piston étant alors supérieure à 40 mm/s, de façon à assurer l'évacuation de l'air emprisonné (14) dès le début dudit enfoncement.6. Method according to any one of claims 2 to 5 dependent on claim 2, in the case where said tubular body (4) contains a creamy or pasty liquid product (5) and in which it is shrunk progressively said peripheral lip (10) of said front part (7) of the sliding piston (3; 30) to a diameter at least 0.6 mm less than the sliding diameter of said tubular body (4) at the start of the depression of said sliding piston (23; 30), the pushing speed of said piston then being greater than 40 mm / s, so as to ensure the evacuation of the trapped air (14) from the start of said depression. 7. Procédé selon la revendication 6, dans lequel on diminue ensuite ladite vitesse de poussée jusqu'à moins de 30 mm/s, à partir d'une distance entre ledit piston glissant (3;30) et le produit contenu (5) au moins égale à 1 mm.7. The method of claim 6, wherein said thrust speed is then reduced to less than 30 mm / s, from a distance between said sliding piston (3; 30) and the product contained (5) at less than 1 mm. 8. Procédé selon la revendication 7, dans lequel la vitesse de poussée est comprise entre 10 et 30 mm/s à l'approche du produit contenu (5) ledit corps tubulaire (4) appartenant à un distributeur de produit crémeux ou pâteux comprenant des moyens de distribution, l'enfoncement du piston (3;30) étant poursuivi jusque dans ledit produit pour amorcer la distribution.8. The method of claim 7, wherein the thrust speed is between 10 and 30 mm / s when approaching the product contained (5) said tubular body (4) belonging to a distributor of creamy or pasty product comprising dispensing means, the depression of the piston (3; 30) being continued into said product to initiate dispensing. 9. Dispositif d'introduction d'un piston glissant de façon étanche (3) à l'intérieur du corps tubulaire (4) cylindrique d'un récipient, la partie frontale (7) dudit piston glissant (3) étant bordée d'une lèvre périphérique évasée souple (10) entrant avec forcement dans ledit corps tubulaire (4), ledit dispositif comprenant des moyens d'enfoncement (1) dudit piston dans ledit corps (4), ces moyens appuyant sur la face envers (13) de ladite partie frontale (7) dudit piston (3), caractérisé en ce que lesdits moyens (1) appuient sur ladite face envers (13) de façon à obtenir un pliage de ladite partie frontale (7) lorsque la pression de l'air (14) qu'elle emprisonne augmente, cet air pouvant alors s'échapper entre ladite lèvre (10) et le corps cylindrique (4).9. Device for introducing a tightly sliding piston (3) inside the cylindrical tubular body (4) of a container, the front part (7) of said sliding piston (3) being bordered by a flexible flared peripheral lip (10) forcing entering said tubular body (4), said device comprising means for driving (1) said piston into said body (4), these means pressing on the reverse side (13) of said front part (7) of said piston (3), characterized in that said means (1) press on said back face (13) so as to obtain a folding of said front part (7) when the air pressure (14 ) that it traps increases, this air then being able to escape between said lip (10) and the cylindrical body (4). 10. Dispositif selon la revendication 9 et comprenant en outre une pièce annulaire (22) pouvant se placer à l'extrémité ouverte (6) dudit corps tubulaire (4) et comportant une surface intérieure tronconique (24) permettant le rétreint de ladite lèvre évasée (10) dudit piston glissant (3) à un diamètre inférieur d'au moins 0,6 mm au diamètre de coulissement dudit corps cylindrique (4), ladite pièce (22) comportant alors des passages d'air (27) entre ladite surface tronconique (24) et ledit corps tubulaire (4), ledit dispositif comportant des moyens de déplacement (23) de ladite pièce annulaire (22) permettant sa mise en place pour ledit rétreint et son dégagement pour l'extraction dudit récipient bouché par ledit piston glissant (3).10. Device according to claim 9 and further comprising an annular part (22) which can be placed at the open end (6) of said tubular body (4) and comprising a frustoconical inner surface (24) allowing the constriction of said flared lip (10) of said sliding piston (3) to a diameter at least 0.6 mm less than the sliding diameter of said cylindrical body (4), said part (22) then comprising air passages (27) between said frustoconical surface (24) and said tubular body (4), said device comprising means of displacement (23) of said annular part (22) allowing its positioning for said constriction and its release for the extraction of said container clogged by said sliding piston (3). 11. Dispositif selon la revendication 10, utilisé pour un distributeur de produit crémeux ou pâteux et comportant des moyens de réglage et de commande (2 et 31) de la vitesse d'enfoncement du piston à plus de 40 mm/s à l'entrée du corps tubulaire (4) et jusqu'à 1 à 5 mm de distance entre ledit piston glissant (3) et le produit (5) contenu dans ledit corps (4), puis entre 10 et 30 mm/s jusqu'au produit contenu (5), lesdits moyens (2 et 31) comportant des moyens d'arrêt dudit piston glissant (3) dans ledit produit (5) à un niveau choisi correspondant à l'amorçage des moyens de distribution du distributeur.11. Device according to claim 10, used for a creamy or pasty product dispenser and comprising means for adjusting and controlling (2 and 31) the speed of depression of the piston at more than 40 mm / s at the inlet. from the tubular body (4) and up to 1 to 5 mm in distance between said sliding piston (3) and the product (5) contained in said body (4), then between 10 and 30 mm / s to the product contained (5), said means (2 and 31) comprising means for stopping said sliding piston (3) in said product (5) at a chosen level corresponding to the priming of the dispenser distribution means.
EP90420342A 1989-07-19 1990-07-17 Method for inserting a tight-fitting piston into a tubular, cylindrical body and the corresponding device Ceased EP0409750A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8910379A FR2649967B1 (en) 1989-07-19 1989-07-19 METHOD OF INTRODUCING A SEALED SLIDING LID INTO A TUBULAR BODY AND CORRESPONDING DEVICE
FR8910379 1989-07-19

Publications (1)

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EP0409750A1 true EP0409750A1 (en) 1991-01-23

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EP90420342A Ceased EP0409750A1 (en) 1989-07-19 1990-07-17 Method for inserting a tight-fitting piston into a tubular, cylindrical body and the corresponding device

Country Status (10)

Country Link
US (1) US5083416A (en)
EP (1) EP0409750A1 (en)
JP (1) JPH0356290A (en)
CA (1) CA2020921A1 (en)
FI (1) FI903638A0 (en)
FR (1) FR2649967B1 (en)
IE (1) IE902620A1 (en)
IS (1) IS3594A7 (en)
NO (1) NO903214L (en)
PT (1) PT94755A (en)

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JP4866005B2 (en) 2002-08-13 2012-02-01 メディカル・インスティル・テクノロジーズ・インコーポレイテッド Container for storing and discharging contents and method related thereto
USD650067S1 (en) 2002-10-16 2011-12-06 Medical Instill Technologies, Inc. Dispenser
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US6997219B2 (en) 2003-05-12 2006-02-14 Medical Instill Technologies, Inc. Dispenser and apparatus and method for filling a dispenser
US7226231B2 (en) 2003-07-17 2007-06-05 Medical Instill Technologies, Inc. Piston-type dispenser with one-way valve for storing and dispensing metered amounts of substances
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EP2520375A3 (en) * 2011-05-04 2012-12-05 Ritter GmbH Closure and expression plunger for cartridges for plastic masses

Also Published As

Publication number Publication date
NO903214D0 (en) 1990-07-18
US5083416A (en) 1992-01-28
NO903214L (en) 1991-01-21
FR2649967A1 (en) 1991-01-25
IE902620A1 (en) 1991-02-27
JPH0356290A (en) 1991-03-11
FR2649967B1 (en) 1991-09-20
IS3594A7 (en) 1991-01-17
FI903638A0 (en) 1990-07-18
CA2020921A1 (en) 1991-01-20
PT94755A (en) 1992-07-31

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