EP0270467B1 - Dispenser for viscous products and method of introducing the piston into it - Google Patents

Dispenser for viscous products and method of introducing the piston into it Download PDF

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Publication number
EP0270467B1
EP0270467B1 EP87420299A EP87420299A EP0270467B1 EP 0270467 B1 EP0270467 B1 EP 0270467B1 EP 87420299 A EP87420299 A EP 87420299A EP 87420299 A EP87420299 A EP 87420299A EP 0270467 B1 EP0270467 B1 EP 0270467B1
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EP
European Patent Office
Prior art keywords
piston
relief
diameter
tubular body
barrel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87420299A
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German (de)
French (fr)
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EP0270467A1 (en
Inventor
Alain Jupin
Bernard Schneider
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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Application filed by Cebal SAS filed Critical Cebal SAS
Priority to AT87420299T priority Critical patent/ATE57666T1/en
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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
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1028—Pumps having a pumping chamber with a deformable wall
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K5/00—Holders or dispensers for soap, toothpaste, or the like
    • A47K5/06—Dispensers for soap
    • A47K5/12—Dispensers for soap for liquid or pasty soap
    • A47K5/1201—Dispensers for soap for liquid or pasty soap hand-carried
    • 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

  • the invention relates to the field of dispensers for pasty products and more particularly those comprising means for conveying a pasty product from the interior of a tubular body to a distribution conduit by compressions and by successive aspirations, the pasty product being supported by a flexible lip piston which slides in the skirt of the tubular body.
  • pasty product designates here any product of pasty consistency which can be dispensed by means of such a dispenser, whether it is described as paste, gel or thick cream.
  • the problem of the evacuation of the air which would otherwise be trapped between the piston and the pasty product during the positioning of the piston is particularly important, and the Applicant sought to solve it in a way not requiring special manufacturing operation.
  • the Applicant has likewise sought to solve the related problem of evacuating the air present in the container through the dispensing orifice, without introducing any additional operation or additional part.
  • the flexible flared peripheral lip of the piston typically has a profile in axial section called a "knife blade" with at its birth a thickness of 0.6 mm and near its end, on 1 to 2 mm, a thickness of 0.2 to 0.4 mm, and this flared lip has an outer end diameter greater than 0.1 to 0.5 mm than the inner diameter of the circular cylindrical skirt of the tubular body and an inclination usually between 10 and 30 ° relative to to the axis of the piston and of this skirt.
  • This lip is spaced from the bottom disc constituting the front of the piston, and slightly recessed with respect to the contact surface of this disc with the pasty product, so that it is little influenced by this contact.
  • the displacement speed of the piston must be between 40 and 300 mm / s and preferably between 80 and 150 mm / s, this from the introduction of the flexible lip in the flared entry zone of the tubular body. It is important that, during the introduction of the piston, the rigid median part in withdrawal passes through the transverse internal relief of the tubular body without any friction, so as to cause neither irregularities of advance nor deviations of the piston. For this reason, the outside diameter of this middle part, between the flexible upper lip and the semi-rigid flared lower end, is at least 0.4 mm less than the minimum inside diameter of this transverse inside relief.
  • the flexible lip of the piston typically having an external diameter greater than 0.1 to 0.5 mm than the internal diameter of the circular cylindrical skirt of the tubular body, preferably a minimum internal diameter less than 0.4 is chosen for the transverse internal relief. 1.2 mm to the inside diameter of this cylindrical skirt. Furthermore, in all cases, it is advantageous to have in the transverse relief one or more interruptions, of limited length so as not to interfere too much with the formation of small undulations on the end of the flexible lip, in practice of unit length. between 0.5 and 3 mm, these interruptions allowing or helping the evacuation of air, in particular during the passage of the semi-rigid flared lower end of the piston through the transverse internal relief.
  • the correct control of the deformation in the constriction of the end of the flexible lip is preferred for the correct control of the deformation in the constriction of the end of the flexible lip to have a flared entry zone of the transverse internal relief of the tubular body substantially frustoconical with a half cone angle of 10 to 25 ° relative to its axis of revolution coincident with the longitudinal axis of the circular cylindrical skirt.
  • an enlargement zone which is too long up to the internal surface of the cylindrical skirt would have the double disadvantage of compromising the maintenance of the small undulations of the end of the lip. flexible until the piston stops and reduce the filling rate of the distributor. It is therefore preferred to have less than 2 mm between the zone of minimum internal diameter of the transverse internal relief and the cylindrical internal surface of the skirt.
  • the internal transverse internal relief and the flared entry zone according to the invention can be obtained in a simple manner using an attached foot, an internal portion of which having a zone of lower minimum internal diameter of a value between 0.3 and 1.5 mm to the inside diameter of the circular cylindrical skirt fits at least over part of its height inside the bottom of this skirt.
  • This inner portion of minimum inner diameter then usually has a height of between 3 and 12 mm, and it is preced from a flared entry area that is also part of the foot.
  • This added foot can be fixed to the skirt, for example by gluing its nested part.
  • the problem of the air leak located on the dispensing head to allow the evacuation of the air possibly occluded in the pasty product while avoiding its drying and without letting pass pasty product is preferably solved by using a small rib of typical height 0.05 to 0.15 mm carried by the end surface of the periphery of the outlet orifice of the head distribution duct, this flat or convex end surface being complementary to the corresponding interior surface of the hood.
  • This solution is simple and does not require the addition of any new part: the hood sinking tightly onto the head and its dispensing orifice, for example with simple forcing, or snap-fastening or screwing, the addition of this small relief does not disturb this depression and provides the desired small leak.
  • the invention applies in particular to a new type of dispenser, used for the tests, a brief description of which will be given on the subject of these tests.
  • This distributor is described in more detail in our French patent application FR-A 2 604 980 published on April 15, 1988.
  • the dispenser body of the invention may be made of one or more materials, comprising in particular PE HD, polypropylene, thermoplastic polymers, glass, metal such as aluminum, and in the case of the cylindrical skirt the metalloplastic complexes.
  • the tubular body is in one piece or with attached foot, its transverse internal relief and its flared entry area being obtained by molding, by forming or by assembly of an added foot.
  • the outside diameter of its cylindrical skirt is typically between 20 and 50 mm.
  • This distributor 1 (FIG. 1) comprises a distribution head 2 and a body 3, this body 3 comprising on the one hand a tubular body 4 which comprises a circular cylindrical skirt 5 and a foot 6, on the other hand a sliding piston 7 with flexible flared upper lip 8 sliding inside the skirt 5 ensuring sealing, and finally a crown 9, here molded onto the extruded skirt 5 and itself comprising a central orifice 10 surrounded by an annular surface d 'support 11 constituting the seat of a suction valve 11,12, of the pasty product, the valve 12 of which comprises an upper veil 13, the annular rim 14 of which obtains the orifice 10 by applying to the surface 11, and an underlying portion 15 engaged in this orifice 10 and provided with retaining bosses 16 of circumscribed cylinder diameter 1 to 2 mm greater than the diameter of the orifice 10, snapped into force through this orifice 10 .
  • the removable cover 33 is simply pressed onto the dispensing head 2, in clamping on the outer skirt 19 and resting on the end 34 of the dispensing conduit 23.
  • the tubular body 4 of the body 3 comprises (FIGS. 1 and 2), at the bottom of its circular cylindrical skirt 5, a transverse internal relief 35 preceded by a flared entry area 36.
  • the minimum internal diameter of the relief 35 is 32.2 mm, while the internal diameter of the skirt 5 of diameter 35 mm outside and 1 mm thick is 33 mm.
  • the flared entry zone 36 is frustoconical of revolution around the axis X of the skirt 5, with a cone half-angle e of 15 ° ( Figure 2), the height of this frustoconical zone is 4 mm and its engagement diameter 34 mm.
  • the piston 7 with a total height of 15 mm and made of HDPE has at the front a bottom disc 37 with a thickness of 0.8 mm, molded so as to best reduce the residual volume of the storage chamber 38 between this disc 37 and the top 9 of the body 3 of the dispenser (FIG. 1) at the end of the guide then (FIG.
  • the dispensers were filled with toothpaste, upside down, as usual, up to 18 to 20 mm from the lower end of the cylindrical skirt 5, that is to say substantially at the same distance below of the zone of minimum diameter 32.2 mm of the transverse relief 35 which ends fairly abruptly, in less than 1 mm, on the side of the skirt 5. Then, the insertions of the pistons 7 are made using a device of the corkscrew type, ensuring correct guiding and manual control by lever.
  • the driving speeds achieved were between 60 and 80 mm / s - Thirty distributors in a first group had a transverse relief 35 without interruption, and fifteen additional distributors had a similar relief 35 with an interruption of length approximately 2 mm and bottom diameter close to the inside diameter of the skirt 5, prepared in recovery.
  • FIG. 3 shows a molded foot 60 comprising an enlarged support base 61, and two upper circular lower 62 and outer 63 lips, each 0.5 mm thick and 4 mm high, leaving between them a circular groove 64 in which fits the lower end 51 of the circular cylindrical skirt 50 of the tubular body.
  • the internal diameter of the skirt 50 with a thickness of 1 mm is 33 mm as before, and the internal part 351 of the foot 60, fitting by its internal lip 62 into the end 51 of the skirt 50, constitutes an internal relief transverse 350, the minimum internal diameter area 352 having a height of 8 mm.
  • This zone 352 is preceded by a flared and slightly curved entry zone 360 of inclination 15 to 20 ° in its engagement part of the flexible lip. of the piston, which is the same as in the example and the previous tests.
  • This molded foot 60 is made of polypropylene, the end 51 of the skirt 50 is fixed in its double lip 62, 63 by gluing.
  • Figure 4 shows a partial horizontal section of the distribution conduit 23 of an actuator 17 ( Figure 1).
  • the cover 33 of the dispenser has an inclined part which comes to bear on the end surface 340 of the conduit 23 complementary to the corresponding interior surface of the cover.
  • This end surface 340 surrounding the orifice 341 has a small rib 342 here substantially vertical, projecting from this surface by a height H of 0.1 mm and of length approximately 1 mm.
  • This small relief is sufficient so that the support of the cover on the end of the duct is not perfect, therefore not airtight, but still airtight with respect to the pasty product dispensed. The evacuation of air from the pasty product when the cover is closed is thus correctly carried out on the side of its distribution.
  • the dispenser of the invention made inviolable by its transverse internal relief, is typically used for the packaging and distribution of hygienic and cosmetic products, in the form of pastes or gels, in particular toothpastes, and for food products in the form thick pastes or creams, for example condiments and toppings.

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  • Public Health (AREA)
  • Health & Medical Sciences (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Confectionery (AREA)
  • Closures For Containers (AREA)
  • Jellies, Jams, And Syrups (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
  • Noodles (AREA)
  • Beans For Foods Or Fodder (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Manufacturing And Processing Devices For Dough (AREA)
  • Coating Apparatus (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Pinball Game Machines (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Abstract

A distributor for pasty products comprises a body having a tubular body (4) with a cylindrical barrel (5), a piston (7) with a flexible flared-out top lip (8) sliding in the barrel (5) and a top carrying an orifice through which the pasty product can pass, and also having a distribution head fixed on the tip. Pasty product is directed and expelled by a suction and compression effect. According to the invention, in order to allow air to be evacuated when the piston is being inserted into the tubular body (4), this body (4) comprises a transverse inner relief (35) having a minimal inside diameter which is 0.5 to 1.5 mm less than the inside diameter of the barrel (5) and, preceding it, a flared-out inlet zone (36) having an engagement diameter at least equal to the outside diameter of the flexible lip (8), the outside diameter of the middle part (40) of the piston (7) being at least 0.4 mm smaller than the minimal inside diameter of the relief (35).

Description

L'invention concerne le domaine des distributeurs pour produits pâteux et plus particulièrement ceux comportant des moyens d'acheminement d'un produit pâteux de l'intérieur d'un corps tubulaire jusqu'à un conduit de distribution par compressions et par aspirations successives, le produit pâteux étant supporté par un piston à lèvre souple qui coulisse dans la jupe du corps tubulaire. Le terme "produit pâteux" désigne ici tout produit de consistance pâteuse pouvant être distribué au moyen d'un tel distributeur, qu'il soit qualifié de pâte, de gel ou de crème épaisse.The invention relates to the field of dispensers for pasty products and more particularly those comprising means for conveying a pasty product from the interior of a tubular body to a distribution conduit by compressions and by successive aspirations, the pasty product being supported by a flexible lip piston which slides in the skirt of the tubular body. The term “pasty product” designates here any product of pasty consistency which can be dispensed by means of such a dispenser, whether it is described as paste, gel or thick cream.

ETAT DE LA TECHNIQUE CONNUEKNOWN STATE OF THE ART

Le brevet EP-B-0048420 (US-A4 402 431) décrit un distributeur pour produit pâteux comportant un corps cylindrique, présentant à son sommet une surface de recouvrement, et un piston qui s'applique de façon étanche par sa circonférence contre la paroi intérieure de ce corps cylindrique et suit l'avance du produit pâteux en direction de la surface de recouvrement, avance résultant d'une dépression et de la pression atmosphérique, et comportant aussi une pompe à membrane présentant une valve d'admission comprise dans la surface de recouvrement, une valve d'expulsion du distributeur et entre ces deux valves une cavité de pompe compressible élastiquement, fermée à l'exception des valves, le distributeur comportant les fuites d'air voulues suivantes ne laissant pas passer le produit pâteux contenu dans le distributeur:

  • - un état rugueux de la paroi intérieure cylindrique du corps du distributeur dans la région d'insertion du piston, les aspérités de la paroi permettant alors à l'air de s'échapper lors de l'insertion du piston jusqu'au contact du produit pâteux;
  • - un interstice en forme de coin laissant passer l'air mais pas le produit pâteux, entre un bouchon obturant l'orifice d'échappement ou de distribution de distributeur et un bord intérieur de cet orifice. Le premier moyen demande une opération particulière pour créer cette surface rugueuse, et le deuxième moyen implique l'utilisation d'une languette ou couvercle comportant ce bouchon, en plus du capot coiffant la tête du distributeur.
Patent EP-B-0048420 (US-A4 402 431) describes a dispenser for pasty product comprising a cylindrical body, having at its top a covering surface, and a piston which is applied sealingly by its circumference against the wall. inside of this cylindrical body and follows the advance of the pasty product in the direction of the covering surface, advance resulting from a vacuum and atmospheric pressure, and also comprising a diaphragm pump having an inlet valve included in the surface cover, a dispenser expulsion valve and between these two valves an elastically compressible pump cavity, closed except for the valves, the dispenser having the following desired air leaks not letting the pasty product contained in the distributor:
  • - a rough condition of the cylindrical inner wall of the distributor body in the region of insertion of the piston, the roughness of the wall then allowing air to escape during the insertion of the piston until contact with the product pasty;
  • - A wedge-shaped interstice allowing air to pass but not the pasty product, between a plug closing the exhaust or distributor dispensing orifice and an inner edge of this orifice. The first means requires a particular operation to create this rough surface, and the second means involves the use of a tongue or cover comprising this plug, in addition to the cover covering the head of the dispenser.

EXPOSE DU PROBLEMEEXPOSURE OF THE PROBLEM

Le problème de l'évacuation de l'air qui serait autrement emprisonné entre le piston et le produit pâteux lors de la mise en place du piston est particulièrement important, et la demanderesse a cherché à le résoudre d'une façon ne demandant pas d'opération particulière de fabrication. La demanderesse a cherché de même à résoudre le problème connexe d'évacuation de l'air présent dans le récipient par l'orifice de distribution, sans introduire d'opération supplémentaire ni de pièce supplémentaire.The problem of the evacuation of the air which would otherwise be trapped between the piston and the pasty product during the positioning of the piston is particularly important, and the Applicant sought to solve it in a way not requiring special manufacturing operation. The Applicant has likewise sought to solve the related problem of evacuating the air present in the container through the dispensing orifice, without introducing any additional operation or additional part.

EXPOSE DE L'INVENTIONSTATEMENT OF THE INVENTION

L'invention a pour objet un distributeur pour produit pâteux qui, comme il est connu par le document EP-B 00 48 420 comprend:

  • a) un corps qui comporte un corps tubulaire, un piston coulissant de façon étanche à l'intérieur de la jupe cylindrique circulaire du corps tubulaire et comportant lui-même une lèvre supérieure évasée souple coulissant à l'intérieur de la jupe en assurant l'étanchéité, une partie médiane rigide en retrait par . rapport à la surface intérieure de ladite jupe cylindrique et une extrémité inférieure évasée semi-rigide coulissant avec un léger jeu ou un léger forcement à l'intérieur de ladite jupe, et un sommet portant au moins un orifice de passage du produit pâteux vers la tête de distribution (b);
  • b) une tête de distribution fixée sur ledit sommet dudit corps (a) et comportant avec ce sommet des moyens d'acheminement du produit pâteux,-de l'intérieur du corps tubulaire jusqu'à un conduit de distribution de ladite tête, par aspiration et compression entraînant l'expulsion dudit produit pâteux vers ledit conduit;
  • c) éventuellement un capot fixé provisoirement sur la tête (b); le corps tubulaire et éventuellement la tête de distribution comportant des moyens de fuite d'air ne laissant pas passer le produit pâteux.
The subject of the invention is a dispenser for pasty product which, as is known from document EP-B 00 48 420, comprises:
  • a) a body which comprises a tubular body, a piston sliding in leaktight manner inside the circular cylindrical skirt of the tubular body and itself comprising a flexible flared upper lip sliding inside the skirt ensuring the sealing, a rigid central part recessed by. relative to the inner surface of said cylindrical skirt and a semi-rigid flared lower end sliding with a slight play or a slight forcing inside of said skirt, and a top carrying at least one orifice for passage of the pasty product towards the head distribution (b);
  • b) a dispensing head fixed on said top of said body (a) and comprising with this top means for conveying the pasty product, from the interior of the tubular body to a distribution duct of said head, by suction and compression resulting in the expulsion of said pasty product towards said conduit;
  • c) possibly a cover provisionally fixed on the head (b); the tubular body and possibly the dispensing head comprising air leakage means which do not allow the pasty product to pass.

Selon l'invention le distributeur est caractérisé en ce que:

  • - la lévre souple a une épaisseur au plus égale à 0.5 mm sur au moins 1 mm à partir de son extrémité, et en ce que
  • - les moyens de fuite d'air du corps tubulaire, lors de l'insertion du piston dans ce corps jusqu'au contact avec le produit pâteux qui y est contenu, consistent en un relief intérieur transversal situé au bas de ladite jupe cylindrique circulaire et de diamètre intérieur minimal inférieur de 0,3 à 1,5 mm au diamètre intérieur de ladite jupe, ainsi qu'en une zone évasée d'entrée de ce relief de diamètre intérieur décroissant depuis un diamètre d'engagement au moins égal au diamètre extérieur à l'état libre de la lèvre souple du piston jusqu'audit diamètre intérieur minimal dudit relief, et le diamètre extérieur de la partie médiane du piston est inférieur d'au moins 0,4 mm audit diamètre intérieur minimal dudit relief.
According to the invention, the dispenser is characterized in that:
  • - the flexible lip has a thickness at most equal to 0.5 mm over at least 1 mm from its end, and in that
  • the air leakage means of the tubular body, during the insertion of the piston into this body until contact with the pasty product which is contained therein, consists of a transverse internal relief situated at the bottom of said circular cylindrical skirt and of minimum internal diameter 0.3 to 1.5 mm less than the internal diameter of said skirt, as well as in a flared entry area of this relief with an internal diameter decreasing from an engagement diameter at least equal to the external diameter in the free state of the flexible lip of the piston up to said minimum internal diameter of said relief, and the external diameter of the middle part of the piston is at least 0.4 mm less than said minimum internal diameter of said relief.

La demanderesse a observé précédemment que, avec des distributeurs dont le corps tubulaire comportait une jupe cylindrique en PE.HD de diamètre 40 mm et d'épaisseur 0,8 mm, le problème d'évacuation d'air lors de la mise en place du piston ne se posait pas. Ceci tenait sans doute à la souplesse relative de telles jupes, et l'utilisation de jupes plus rigides, de diamètre 35 mm et d'épaisseur 1 mm, a entraîné l'apparition de problèmes fréquents d'occlusion d'air entre le piston et le produit pâteux.The Applicant has previously observed that, with distributors whose tubular body has a cylindrical skirt in HDPE 40 mm in diameter and 0.8 mm thick, the problem of air evacuation during the installation of the piston did not land. This was undoubtedly due to the relative flexibility of such skirts, and the use of more rigid skirts, 35 mm in diameter and 1 mm thick, led to the appearance of frequent problems of air occlusion between the piston and the pasty product.

Par ailleurs, on sait que ces problèmes se posent avec acuité dans le cas de corps tubulaires en matière plastique dont la surface cylindrique circulaire intérieure est particulièrement lisse, par exemple lorsque ces corps tubulaire sont obtenus par moulage. Dans le cas de distributeurs à corps tubulaires selon l'invention, ces corps comportant chacun une jupe cylindrique diamètre 40 x épaisseur 1 mm en PE.HD, et au bas de cette jupe le relief intérieur transversal et la zone d'entrée évasée de l'invention, on a constaté sur plusieurs dizaines d'essais que l'air compris entre le piston à lèvre souple et le produit pâteux s'échappait de façon satisfaisante.Furthermore, it is known that these problems arise acutely in the case of tubular plastic bodies whose inner circular cylindrical surface is particularly smooth, for example when these tubular bodies are obtained by molding. In the case of distributors with tubular bodies according to the invention, these bodies each comprising a cylindrical skirt diameter 40 x thickness 1 mm in PE.HD, and at the bottom of this skirt the transverse internal relief and the flared entry zone of the invention, it has been observed on several tens of tests that the air comprised between the flexible lip piston and the pasty product escaped satisfactorily.

La lèvre périphérique évasée souple du piston a typiquement un profil en section axiale dite en "lame de couteau" avec à sa naissance une épaisseur de 0,6 mm et près de son extrémité, sur 1 à 2 mm, une épaisseur de 0,2 à 0,4 mm, et cette lèvre évasée a un diamètre extérieur d'extrémité supérieur de 0,1 à 0,5 mm au diamètre intérieur de la jupe cylindrique circulaire du corps tubulaire et une inclinaison habituellement comprise entre 10 et 30° par rapport à l'axe du piston et de cette jupe. Cette lèvre est écartée du disque de fond constituant l'avant du piston, et légèrement en retrait par rapport à la surface de contact de ce disque avec le produit pâteux, de sorte qu'elle est peu influencée par ce contact.The flexible flared peripheral lip of the piston typically has a profile in axial section called a "knife blade" with at its birth a thickness of 0.6 mm and near its end, on 1 to 2 mm, a thickness of 0.2 to 0.4 mm, and this flared lip has an outer end diameter greater than 0.1 to 0.5 mm than the inner diameter of the circular cylindrical skirt of the tubular body and an inclination usually between 10 and 30 ° relative to to the axis of the piston and of this skirt. This lip is spaced from the bottom disc constituting the front of the piston, and slightly recessed with respect to the contact surface of this disc with the pasty product, so that it is little influenced by this contact.

Lors de l'insertion du piston dans la zone d'entrée évasée, l'extrémité de sa lèvre souple est obligée de se rétreindre progressivement et une observation stroboscopique effectuée sur plusieurs corps transparents de distributeurs selon l'invention pendant l'introduction de leurs pistons a montré que cette extrémité de lèvre présentait après franchissement du relief intérieur transversal succèdant à la zone d'entrée des petites ondulations ou frisures et qu'elle les conservait jusqu'à l'arrêt du piston au contact du produit pâteux, de l'air passant le long de ces petites ondulations contribuant à empêcher la lèvre souple de se plaquer contre la surface intérieure de la jupe cylindrique pendant le déplacement. Les ondulations de l'extrémité de la lèvre s'effacent .et la lèvre s'applique sur la surface intérieure de la jupe par toute sa périphérie en un temps assez court, de l'ordre de 1 à 2 secondes, après l'arrêt du piston en contact avec le produit pâteux. L'efficacité de l'évacuation de l'air qui aurait été emprisonné s'il n'y avait pas eu une telle déformation de l'extrémité de la lèvre a été montrée de deux façons:

  • il n'y a pas de recul du piston après arrêt, c"est-à-dire pas de compression puis de détente d'air occlus, et le vidage du distributeur ne produit que des rubans de produit pâteux sans bulles et réguliers. S'il n'y avait pas de zone d'entrée évasée, l'extrémité de la lèvre souple viendrait en butée sur le relief intérieur transversal et tendrait à se retourner.
When inserting the piston into the flared entry zone, the end of its flexible lip is forced to gradually shrink and a stroboscopic observation is made on several transparent bodies of distributors according to the invention during the introduction of their pistons has shown that this end of the lip had after crossing the transverse internal relief succeeding the entry zone of small undulations or crimps and that it kept them until the piston stopped in contact with the pasty product, air passing along these small undulations helping to prevent the flexible lip from pressing against the inner surface of the cylindrical skirt during movement. The undulations of the end of the lip disappear. And the lip is applied to the inner surface of the skirt by its entire periphery in a fairly short time, of the order of 1 to 2 seconds, after stopping piston in contact with the pasty product. The efficiency of the evacuation of the air which would have been trapped if there had not been such a deformation of the end of the lip has been shown in two ways:
  • there is no recoil of the piston after stopping, that is to say no compression and then relaxation of occluded air, and the emptying of the distributor produces only ribbons of pasty product without bubbles and regular. S 'there was no flared entry area, the end of the flexible lip would abut on the transverse internal relief and would tend to turn over.

Lorsque l'introduction du piston est trop lente, les petites ondulations de l'extrémité de la lèvre souple du piston s'effacent avant l'arrêt du piston, et lorsque la vitesse d'introduction est trop élevée les problèmes de guidage du piston deviennent difficilement surmontables.When the introduction of the piston is too slow, the small undulations of the end of the flexible lip of the piston are erased before the stop of the piston, and when the speed of introduction is too high the problems of guidance of the piston become difficult to overcome.

En pratique, la vitesse de déplacement du piston doit être comprise entre 40 et 300 mm/s et de préférence entre 80 et 150 mm/s, cela dès l'introduction de la lèvre souple dans la zone d'entrée évasée du corps tubulaire. Il est important que, lors de l'introduction du piston, la partie médiane rigide en retrait passe à travers le relief intérieur transversal du corps tubulaire sans aucun frottement, de façon à ne causer ni irrégularités d'avance ni déviations du piston. Pour cette raison, le diamètre extérieur de cette partie médiane, comprise entre la lèvre supérieure souple et l'extrémité inférieure évasée semi-rigide, est inférieur d'au moins 0,4 mm au diamètre intérieur minimal de ce relief intérieur transversal.In practice, the displacement speed of the piston must be between 40 and 300 mm / s and preferably between 80 and 150 mm / s, this from the introduction of the flexible lip in the flared entry zone of the tubular body. It is important that, during the introduction of the piston, the rigid median part in withdrawal passes through the transverse internal relief of the tubular body without any friction, so as to cause neither irregularities of advance nor deviations of the piston. For this reason, the outside diameter of this middle part, between the flexible upper lip and the semi-rigid flared lower end, is at least 0.4 mm less than the minimum inside diameter of this transverse inside relief.

Le passage de l'extrémité inférieure évasée semi-rigide du piston, dont le diamètre extérieur au repos est ajusté, par rapport au diamètre intérieur de la jupe cylindrique circulaire typiquement a ±0,2mm et de préférence à ±0,1 mm, à travers le relief intérieur transversal se fait sans difficulté, la déformation élastique en léger resserrement de cette extrémité évasée en matière plastique d'épaisseur typiquement comprise entre 0,6 et 0,8 mm étant progressive. Après que cette extrémité inférieure du piston ait franchi le relief transversal, elle reprend sa forme et coulisse avec un jeu faible ou un léger forcement à l'intérieur de la jupe tubulaire, et le relief transversal interdit ensuite le retrait du piston hors du corps tubulaire, ce qui donne une sécuri té anti- fraude et constitue un avantage important de l'invention.The passage from the semi-rigid flared lower end of the piston, whose outside diameter at rest is adjusted, relative to the inside diameter of the circular cylindrical skirt typically a ± 0.2mm and preferably ± 0.1mm, to through the transverse internal relief is done without difficulty, the elastic deformation in slight tightening of this flared end in plastic material of thickness typically between 0.6 and 0.8 mm being progressive. After this lower end of the piston has crossed the transverse relief, it resumes its shape and slides with a slight clearance or a slight forcing inside the tubular skirt, and the transverse relief then prohibits the withdrawal of the piston from the tubular body , which gives anti-fraud security and constitutes an important advantage of the invention.

La lèvre souple du piston ayant typiquement un diamètre extérieur supérieur de 0,1 à 0,5 mm au diamètre intérieur de la jupe cylindrique circulaire du corps tubulaire, on choisit de préférence pour le relief intérieur transversal un diamètre intérieur minimal inférieur de 0,4 à 1,2 mm au diamètre intérieur de cette jupe cylindrique. Par ailleurs, dans tous les cas, il est intéressant d'avoir dans le relief transversal une ou plusieurs interruptions, de longueur limitée pour ne pas trop gêner la formation des petites ondulations sur l'extrémité de la lèvre souple, en pratique de longueur unitaire comprise entre 0,5 et 3 mm, ces interruptions permettant ou aidant l'évacuation de l'air, en particulier pendant le passage de l'extrémité inférieure évasée semi-rigide du piston à travers le relief intérieur transversal.The flexible lip of the piston typically having an external diameter greater than 0.1 to 0.5 mm than the internal diameter of the circular cylindrical skirt of the tubular body, preferably a minimum internal diameter less than 0.4 is chosen for the transverse internal relief. 1.2 mm to the inside diameter of this cylindrical skirt. Furthermore, in all cases, it is advantageous to have in the transverse relief one or more interruptions, of limited length so as not to interfere too much with the formation of small undulations on the end of the flexible lip, in practice of unit length. between 0.5 and 3 mm, these interruptions allowing or helping the evacuation of air, in particular during the passage of the semi-rigid flared lower end of the piston through the transverse internal relief.

Dans la pratique, on préfère pour le bon contrôle de la déformation en rétreint de l'extrémité de la lèvre souple avoir une zone d'entrée évasée du relief intérieur transversal du corps tubulaire sensiblement tronconique avec un demi-angle de cône de 10 à 25° par rapport à son axe de révolution confondu avec l'axe longitudinal de la jupe cylindrique circulaire. En outre, au-delà du diamètre intérieur minimal du relief intérieur transversal, une zone d'élargissement trop longue jusqu'à la surface intérieure de la jupe cylindrique aurait le double inconvénient de compromettre le maintien des petites ondulations de l'extrémité de la lèvre souple jusqu'à l'arrêt du piston et de diminuer le taux de remplissage du distributeur. On préfère par suite avoir moins de 2 mm entre la zone de diamètre intérieur minimal du relief intérieur transversal et la surface intérieure cylindrique de la jupe. Le relief intérieur intérieur transversal et la zone d'entrée évasée selon l'invention peuvent être obtenus de façon simple à l'aide d'un pied rapporté, dont une portion intérieure présentant une zone de diamètre intérieur minimal inférieur d'une valeur comprise entre 0,3 et 1,5 mm au diamètre intérieur de la jupe cylindrique circulaire s'emboîte au moins sur une partie de sa hauteur à l'intérieur du bas de cette jupe. Cette portion intérieure de diamètre intérieur minimal a alors habituellement une hauteur comprise entre 3 et 12 mm, et elle est précédée d'une zone d'entrée évasée faisant également partie du pied. Ce pied rapporté peut être fixé à la jupe par exemple par collage de sa partie emboîtée.In practice, it is preferred for the correct control of the deformation in the constriction of the end of the flexible lip to have a flared entry zone of the transverse internal relief of the tubular body substantially frustoconical with a half cone angle of 10 to 25 ° relative to its axis of revolution coincident with the longitudinal axis of the circular cylindrical skirt. In addition, beyond the minimum internal diameter of the transverse internal relief, an enlargement zone which is too long up to the internal surface of the cylindrical skirt would have the double disadvantage of compromising the maintenance of the small undulations of the end of the lip. flexible until the piston stops and reduce the filling rate of the distributor. It is therefore preferred to have less than 2 mm between the zone of minimum internal diameter of the transverse internal relief and the cylindrical internal surface of the skirt. The internal transverse internal relief and the flared entry zone according to the invention can be obtained in a simple manner using an attached foot, an internal portion of which having a zone of lower minimum internal diameter of a value between 0.3 and 1.5 mm to the inside diameter of the circular cylindrical skirt fits at least over part of its height inside the bottom of this skirt. This inner portion of minimum inner diameter then usually has a height of between 3 and 12 mm, and it is preced from a flared entry area that is also part of the foot. This added foot can be fixed to the skirt, for example by gluing its nested part.

Le problème de la fuite d'air située sur la tête de distribution pour permettre l'évacuation de l'air éventuellement occlus dans le produit pâteux tout en évitant son séchage et sans laisser passer de produit pâteux est de préférence résolu en utilisant une petite nervure de hauteur typique 0,05 à 0,15 mm portée par la surface d'extrémité du pourtour de l'orifice de sortie du conduit de distribution de la tête, cette surface d'extrémité plane ou convexe étant complémentaire de la surface intérieure correspondante du capot. Cette solution est simple et ne demande l'apport d'aucune pièce nouvelle: le capot s'enfonçant de façon étanche sur la tête et son orifice de distribution, par exemple avec simple forcement, ou encliquetage ou vissage, l'ajout de ce petit relief ne perturbe pas cet enfoncement et procure la petite fuite souhaitée.The problem of the air leak located on the dispensing head to allow the evacuation of the air possibly occluded in the pasty product while avoiding its drying and without letting pass pasty product is preferably solved by using a small rib of typical height 0.05 to 0.15 mm carried by the end surface of the periphery of the outlet orifice of the head distribution duct, this flat or convex end surface being complementary to the corresponding interior surface of the hood. This solution is simple and does not require the addition of any new part: the hood sinking tightly onto the head and its dispensing orifice, for example with simple forcing, or snap-fastening or screwing, the addition of this small relief does not disturb this depression and provides the desired small leak.

L'invention s'applique en particulier à un nouveau type de distributeur, utilisé pour les essais, dont une brève description sera donnée au sujet de ces essais. Ce distributeur est décrit plus en détail dans notre demande de brevet français FR-A 2 604 980 publié le 15.04.1988.The invention applies in particular to a new type of dispenser, used for the tests, a brief description of which will be given on the subject of these tests. This distributor is described in more detail in our French patent application FR-A 2 604 980 published on April 15, 1988.

Le corps de distributeur de l'invention peut être en un ou plusieurs matériaux, comprenant en particulier le PE HD, le polypropylène, les polymères thermoplastiques, le verre, le métal tel que l'aluminium, et dans le cas de la jupe cylindrique les complexes métalloplastiques. Le corps tubulaire est monobloc ou avec pied rapporté, son relief intérieur transversal et sa zone d'entrée évasée étant obtenus par moulage, par formage ou par assemblage d'un pied rapporté. Le diamètre extérieur de sa jupe cylindrique est typiquement compris entre 20 et 50 mm.The dispenser body of the invention may be made of one or more materials, comprising in particular PE HD, polypropylene, thermoplastic polymers, glass, metal such as aluminum, and in the case of the cylindrical skirt the metalloplastic complexes. The tubular body is in one piece or with attached foot, its transverse internal relief and its flared entry area being obtained by molding, by forming or by assembly of an added foot. The outside diameter of its cylindrical skirt is typically between 20 and 50 mm.

L'invention a enfin pour objet le procédé correspondant d'introduction du piston à l'intérieur du corps tubulaire, l'extrémité ouverte dudit corps étant en position haute, procédé dans lequel:

  • A/ on descend le piston vers le produit pâteux, sa lèvre souple d'épaisseur au plus égale à 0,4 mm sur au moins 1 mm à partir de son extrémité étant vers l'avant, en assurant son guidage axial au cours de cette descente;
  • B/ on met en contact l'extrémité de la lèvre souple à l'intérieur d'une zone d'entrée évasée du corps tubulaire, dont le diamètre 10 décroît ensuite continûment jusqu'au diamètre intérieur minimal d'un relief transversal, ce diamètre minimal étant inférieur de 0,3 à 1,5 mm au diamètre intérieur de la jupe, et on rétreint l'extrémité de la lèvre souple en lui faisant franchir cette zone d'entrée et ce relief transversal, de sorte qu'il se forme des petites ondulations transversales de l'extrémité de cette lèvre permettant à l'air occlus de se dégager:
  • C/ on poursuit le déplacement du piston en lui faisant franchir complètement la zone d'entrée et le relief transversal et jusqu'au contact du produit pâteux; la vitesse de déplacement du piston pour les étapes (B) et (C) étant comprise entre 40 et 300 mm/s et de préférence entre 80 et 150 mmls, de sorte que lesdites ondulations se maintiennent jusqu'à l'arrêt du piston.
The invention finally relates to the corresponding method of introducing the piston inside the tubular body, the open end of said body being in the high position, method in which:
  • A / the piston is lowered towards the pasty product, its flexible lip with a thickness at most equal to 0.4 mm over at least 1 mm from its end being towards the front, ensuring its axial guidance during this descent;
  • B / the end of the flexible lip is brought into contact inside a flared entry zone of the tubular body, the diameter of which then decreases continuously until the minimum internal diameter of a transverse relief, this diameter minimum being 0.3 to 1.5 mm smaller than the inside diameter of the skirt, and the end of the flexible lip is constricted by making it pass through this entry zone and this transverse relief, so that it forms small transverse undulations of the end of this lip allowing the occluded air to be released:
  • C / the displacement of the piston is continued by making it completely cross the entry zone and the transverse relief and until contact with the pasty product; the speed of displacement of the piston for steps (B) and (C) being between 40 and 300 mm / s and preferably between 80 and 150 mmls, so that said undulations are maintained until the piston stops.

Pour ce procédé, on adopte de préférence les dispositions suivantes:

  • - le diamètre extérieur de la lèvre souple est supérieur de 0,2 à 0,4 mm au diamètre intérieur de la jupe cylindrique circulaire;
  • - la zone d'entrée évasée du corps tubulaire est sensiblement tronconique avec un demi-angle de cône compris entre 10 et 25°;
  • - on rattrape la surface intérieure cylindrique de la jupe moins de 2 mm après la zone de diamètre intérieur minimal du relief transversal du corps tubulaire.
For this process, the following arrangements are preferably adopted:
  • - the outside diameter of the flexible lip is 0.2 to 0.4 mm greater than the inside diameter of the circular cylindrical skirt;
  • - the flared entry area of the tubular body is substantially frustoconical with a cone half-angle of between 10 and 25 °;
  • - the inner cylindrical surface of the skirt is caught less than 2 mm after the zone of minimum internal diameter of the transverse relief of the tubular body.

La description des essais et exemples permettra de mieux faire comprendre les différents aspects de l'invention.The description of the tests and examples will make it possible to better understand the different aspects of the invention.

ESSAIS ET EXEMPLESTESTS AND EXAMPLES

  • La figure 1 représente un premier distributeur selon l'invention, utilisé pour les essais, en demi-coupe axiale longitudinale.FIG. 1 represents a first distributor according to the invention, used for the tests, in longitudinal axial half-section.
  • La figure 2 représente le bas du corps tubulaire et le piston de ce premier distributeur, à plus fort grossissement, également en demi-coupe axiale longitudinale.Figure 2 shows the bottom of the tubular body and the piston of this first distributor, at higher magnification, also in longitudinal axial half-section.
  • La figure 3 représente le bas du corps tubulaire et le pied rapporté d'un deuxième distributeur selon l'invention, en demi-coupe axiale, longitudinale.Figure 3 shows the bottom of the tubular body and the attached foot of a second distributor according to the invention, in axial, longitudinal half-section.
  • La figure 4 représente le pourtour de l'orifice de distribution d'un distributeur selon l'invention, en coupe horizontale partielle passant par une fine nervure créant une fuite d'air.FIG. 4 shows the periphery of the dispensing orifice of a dispenser according to the invention, in partial horizontal section passing through a fine rib creating an air leak.

Les essais comparatifs d'introduction du piston dans le corps tubulaire du distributeur rempli de produit pâteux, à savoir de la pâte dentifrice, ont tour été effectués avec des distributeurs du type représenté dans la figure 1, les uns sans relief intérieur transversal selon la présente invention, les autres avec les relief intérieur transversal et la zone d'entrée évasée qui sont représentés sur les figures 1 et 2.The comparative tests of introduction of the piston into the tubular body of the distributor filled with pasty product, namely toothpaste, were in turn carried out with distributors of the type represented in FIG. 1, some without transverse internal relief according to the present invention, the others with the transverse internal relief and the flared entry zone which are represented in FIGS. 1 and 2.

Ce distributeur 1 (figure 1) comporte une tête de distribution 2 et un corps 3, ce corps 3 comportant d'une part un corps tubulaire 4 qui comprend une jupe cylindrique circulaire 5 et un pied 6, d'autre part un piston coulissant 7 à lèvre supérieure évasée souple 8 coulissant à l'intérieur de la jupe 5 en assurant l'étanchéité, et enfin un sommet 9, ici surmoulé sur la jupe extrudée 5 et comportant lui-même un orifice central 10 entouré d'une surface annulaire d'appui 11 constituant le siège d'une soupape d'aspiration 11,12, du produit pâteux dont le clapet 12 comporte un voile supérieur 13, dont le rebord annulaire 14 réalise l'obturation de l'orifice 10 en s'appliquant sur la surface 11, et une portion sous-jacente 15 engagée dans cet orifice 10 et munie de bossages de retenue 16 de diamètre de cylindre circonscrit supérieur de 1 à 2 mm au diamètre de l'orifice 10, encliquetée à force au travers de cet orifice 10.This distributor 1 (FIG. 1) comprises a distribution head 2 and a body 3, this body 3 comprising on the one hand a tubular body 4 which comprises a circular cylindrical skirt 5 and a foot 6, on the other hand a sliding piston 7 with flexible flared upper lip 8 sliding inside the skirt 5 ensuring sealing, and finally a crown 9, here molded onto the extruded skirt 5 and itself comprising a central orifice 10 surrounded by an annular surface d 'support 11 constituting the seat of a suction valve 11,12, of the pasty product, the valve 12 of which comprises an upper veil 13, the annular rim 14 of which obtains the orifice 10 by applying to the surface 11, and an underlying portion 15 engaged in this orifice 10 and provided with retaining bosses 16 of circumscribed cylinder diameter 1 to 2 mm greater than the diameter of the orifice 10, snapped into force through this orifice 10 .

La tête de distribution 2 comporte :

  • - un actionneur 17 qui comprend d'une part une partie fixe 18 comportant une jupe extérieure 19 portant à sa partie inférieure un moyen de fixation 20 sur le sommet 9 du corps 3 du distributeur 1, et d'autre part une partie centrale inclinable 21 reliée à sa partie fixe 18 par une patte déformable 32 et comportant un voile d'appui 22 ainsi qu'un conduit de distribution 23 débouchant dans une cheminée longitudinale 24 qui est portée par le dessous du voile d'appui 22 et emboîte de façon étanche la tubulure supérieure 25 d'une coupelle déformable 26 formant avec le voile d'appui 22 et avec le sommet 9 du corps 3 du distributeur une chambre de compression 27, la surface de dessous 28 du voile d'appui 22 au fond de cette cheminée 24 étant plane ou de courbure faible;
  • - la coupelle déformable 26 qui est monobloc et comprend en allant du bas vers le haut : un moyen de fixation étanche 29 sur le sommet 2 du corps 3 du distributeur, puis un voile déformable 30, puis la tubulure supérieure 25 surmontée d'une lèvre supérieure souple 31 qui forme avec la surface de dessous 28 du voile d'appui 22 au fond de la cheminée 24 une soupape d'expulsion 28,31 du produit dans le conduit de distribution 23.
The dispensing head 2 comprises:
  • - An actuator 17 which comprises on the one hand a fixed part 18 comprising an outer skirt 19 carrying at its lower part a fixing means 20 on the top 9 of the body 3 of the distributor 1, and on the other hand a tilting central part 21 connected to its fixed part 18 by a deformable tab 32 and comprising a support veil 22 as well as a distribution conduit 23 opening into a chimney longitudinal 24 which is carried by the underside of the support veil 22 and sealingly fits the upper tube 25 of a deformable cup 26 forming with the support veil 22 and with the top 9 of the body 3 of the distributor a compression 27, the bottom surface 28 of the support web 22 at the bottom of this chimney 24 being flat or of weak curvature;
  • - the deformable cup 26 which is in one piece and comprises, going from bottom to top: a sealed fixing means 29 on the top 2 of the body 3 of the dispenser, then a deformable veil 30, then the upper tube 25 surmounted by a lip flexible upper 31 which forms with the bottom surface 28 of the support web 22 at the bottom of the chimney 24 an expulsion valve 28, 31 of the product in the distribution duct 23.

Le capot amovible 33 est simplement enfoncé sur la tête de distribution 2, en serrage sur la jupe extérieure 19 et en appui sur l'extrémité 34 du conduit de distribution 23. Le corps tubulaire 4 du corps 3 comprend (figures 1 et 2), au bas de sa jupe cylindrique circulaire 5, un relief intérieur transversal 35 précédé d'une zone d'entrée évasée 36. Le diamètre intérieur minimal du relief 35 est de 32,2 mm, tandis que le diamètre intérieur de la jupe 5 de diamètre extérieur 35 mm et d'épaisseur 1 mm est de 33 mm. La zone d'entrée évasée 36 est tronconique de révolution autour de l'axe X de la jupe 5, avec un demi-angle de cône e de 15° (figure 2), la hauteur de cette zone tronconique est de 4 mm et son diamètre d'engagement 34 mm. Le piston 7 de hauteur totale 15 mm et en PE HD comporte à l'avant un disque de fond 37 d'épaisseur 0,8 mm, mouluré de façon à réduire au mieux le volume résiduel de la chambre de stockage 38 comprise entre ce disque 37 et le sommet 9 du corps 3 du distributeur (figure 1) en fin de guidage puis (figure 2) en retrait de 1,5 à 2 mm et séparée de ce disque 37 par une partie annulaire en creux 39, la lèvre supérieure souple 8 de diamètre extérieur d'extrémité au repos 33,3 mm, puis une partie médiane cylindrique 40 de diamètre extérieur 31,5 mm, d'épaisseur 1 mm, et de hauteur 8 mm, et enfin prolongeant cette partie médiane 40 une extrémité inférieure 41 légèrement évasée et légèrement amincie, dont l'extrémité proprement dite 42 a un diamètre extérieur au repos de 33,1 mm et une épaisseur de 0,6 à 0,7 mm. Une fois le piston 7 entièrement introduit à l'intérieur de la jupe 5, le relief transversal 35 empêche de rétreindre l'extrémité inférieure 42,41 pour extraire le piston 7 du corps tubulaire 4.The removable cover 33 is simply pressed onto the dispensing head 2, in clamping on the outer skirt 19 and resting on the end 34 of the dispensing conduit 23. The tubular body 4 of the body 3 comprises (FIGS. 1 and 2), at the bottom of its circular cylindrical skirt 5, a transverse internal relief 35 preceded by a flared entry area 36. The minimum internal diameter of the relief 35 is 32.2 mm, while the internal diameter of the skirt 5 of diameter 35 mm outside and 1 mm thick is 33 mm. The flared entry zone 36 is frustoconical of revolution around the axis X of the skirt 5, with a cone half-angle e of 15 ° (Figure 2), the height of this frustoconical zone is 4 mm and its engagement diameter 34 mm. The piston 7 with a total height of 15 mm and made of HDPE has at the front a bottom disc 37 with a thickness of 0.8 mm, molded so as to best reduce the residual volume of the storage chamber 38 between this disc 37 and the top 9 of the body 3 of the dispenser (FIG. 1) at the end of the guide then (FIG. 2) set back 1.5 to 2 mm and separated from this disc 37 by an annular hollow portion 39, the flexible upper lip 8 with an outer diameter at rest 33.3 mm, then a cylindrical middle portion 40 with an outer diameter 31.5 mm, 1 mm thick and 8 mm high, and finally extending this middle portion 40 a lower end 41 slightly flared and slightly thinned, the end proper 42 has an outside diameter at rest of 33.1 mm and a thickness of 0.6 to 0.7 mm. Once the piston 7 has been fully inserted inside the skirt 5, the transverse relief 35 prevents the lower end 42, 41 from being constricted in order to extract the piston 7 from the tubular body 4.

ESSAIS EFFECTUES SUR DE TELS DISTRIBUTEURSTESTS CARRIED OUT ON SUCH DISTRIBUTORS

Les distributeurs étaient remplis de pâte dentifrice, tête en bas, comme il est habituel, jusqu'à 18 à 20 mm de l'extrémité inférieure de la jupe cylindrique 5, c'est-à-dire sensiblement à cette même distance en-dessous de la zone de diamètre minimal 32,2 mm du relief transversal 35 qui se termine de façon assez abrupte, en moins 1 mm, du côté de la jupe 5. Ensuite, les insertions des pistons 7 sont été faites à l'aide d'un appareil du type enfonce-bouchon, assurant, un guidage correct et un enfoncement commandé manuellement par levier. Les vitesses d'enfoncement réalisées étaient comprises entre 60 et 80 mm/s - Trente distributeurs d'un premier groupe comportaient un relief transversal 35 sans interruption, et quinze distributeurs supplémentaires comportaient un relief semblable 35 avec une interruption de longueur environ 2 mm et de diamètre de fond voisin du diamètre intérieur de la jupe 5, préparée en reprise.The dispensers were filled with toothpaste, upside down, as usual, up to 18 to 20 mm from the lower end of the cylindrical skirt 5, that is to say substantially at the same distance below of the zone of minimum diameter 32.2 mm of the transverse relief 35 which ends fairly abruptly, in less than 1 mm, on the side of the skirt 5. Then, the insertions of the pistons 7 are made using a device of the corkscrew type, ensuring correct guiding and manual control by lever. The driving speeds achieved were between 60 and 80 mm / s - Thirty distributors in a first group had a transverse relief 35 without interruption, and fifteen additional distributors had a similar relief 35 with an interruption of length approximately 2 mm and bottom diameter close to the inside diameter of the skirt 5, prepared in recovery.

Les essais d'insertion des pistons jusqu'au contact du produit pâteux ont donné les résultats suivants :

  • - parmi les trente distributeurs du premier groupe, six ont donné un léger effet de remontée du piston (moins de 1 mm) et quelques inclusions d'air dans la pâte dentifrice en fin de vidage du distributeur, tandis que les vingt quatre autres distributeurs ne donnaient aucun problème;
  • - l'observation stroboscopique déjà décrite dans l'exposé de l'invention a été faite sur cinq de ces distributeurs, leurs corps tubulaires étant suffisamment transparents. En complément, quatre distributeurs du même type ont été sectionnés transversalement au-dessus de leur relief transversal circulaire, le piston de chaque distributeur étant arrêté dans la position de franchissement de ce relief par l'extrémité de sa lèvre souple, et on a observé que cette lèvre formait, dans chacun de ces cas et sur un peu plus de 1 mm à partir de son extrémité, 12 à 15 longues ondulations transversales sur sa périphérie.
  • - les quinze distributeurs supplémentaires ont tous donné d'excellents résultats.
The tests of insertion of the pistons until contact with the pasty product gave the following results:
  • - among the thirty distributors in the first group, six gave a slight upward piston effect (less than 1 mm) and some air inclusions in the toothpaste at the end of emptying the distributor, while the other twenty four distributors gave no problem;
  • - The stroboscopic observation already described in the description of the invention was made on five of these distributors, their tubular bodies being sufficiently transparent. In addition, four distributors of the same type were sectioned transversely above their circular transverse relief, the piston of each distributor being stopped in the crossing position of this relief by the end of its flexible lip, and it has been observed that this lip formed, in each of these cases and over a little more than 1 mm from its end, 12 to 15 long transverse undulations on its periphery.
  • - the fifteen additional distributors have all given excellent results.

Le caractère artisanal de ces essais permet de conclure que, en série industrielle, une ou plusieurs interruptions du relief intérieur transversal ne s'imposent pas dans tous les cas de réalisation, et apportent pour les autres cas et de façon générale une bonne sécurité pour l'évacuation d'air recherchée.The artisanal nature of these tests makes it possible to conclude that, in industrial series, one or more interruptions of the transverse interior relief are not necessary in all the cases of realization, and bring for the other cases and generally a good safety for the 'exhaust air sought.

EXEMPLE DE REALISATION DU RELIEF INTE-RIEUR TRANSVERSAL AVEC UN PIED RAPPORTEEXAMPLE OF REALIZATION OF THE CROSS INTERIOR RELIEF WITH AN ADDED FOOT

La figure 3 montre un pied moulé 60 comportant une base élargie d'appui 61, et deux lèvres supérieures circulaires inférieure 62 et extérieure 63, chacune d'épaisseur 0,5 mm et de hauteur 4 mm, laissant entre elles une rainure circulaire 64 dans laquelle s'emboîte l'extrémité basse 51 de la jupe cylindrique circulaire 50 du corps tubulaire. Le diamètre intérieur de la jupe 50 d'épaisseur 1 mm est de 33 mm comme précédemment, et la partie intérieure 351 du pied 60, s'emboîtant par sa lèvre intérieure 62 dans l'extrémité 51 de la jupe 50, constitue un relief intérieur transversal 350 dont la zone de diamètre intérieur minimal 352 a une hauteur de 8 mm. Cette zone 352 est précédée d'une zone d'entrée évasée et légèrement incurvée 360 d'inclinaison 15 à 20° dans sa partie d'engagement de la lèvre souple du piston, qui est le même que dans l'exemple et les essais précédents. Ce pied moulé 60 est en polypropylène, l'extrémité 51 de la jupe 50 est fixée dans sa double lèvre 62, 63 par collage.FIG. 3 shows a molded foot 60 comprising an enlarged support base 61, and two upper circular lower 62 and outer 63 lips, each 0.5 mm thick and 4 mm high, leaving between them a circular groove 64 in which fits the lower end 51 of the circular cylindrical skirt 50 of the tubular body. The internal diameter of the skirt 50 with a thickness of 1 mm is 33 mm as before, and the internal part 351 of the foot 60, fitting by its internal lip 62 into the end 51 of the skirt 50, constitutes an internal relief transverse 350, the minimum internal diameter area 352 having a height of 8 mm. This zone 352 is preceded by a flared and slightly curved entry zone 360 of inclination 15 to 20 ° in its engagement part of the flexible lip. of the piston, which is the same as in the example and the previous tests. This molded foot 60 is made of polypropylene, the end 51 of the skirt 50 is fixed in its double lip 62, 63 by gluing.

EXEMPLE D'UN MOYEN DE FUITE D'AIR PORTE PAR LE CONDUIT DE DISTRIBUTIONEXAMPLE OF A MEANS OF AIR LEAKAGE FROM THE DISTRIBUTION DUCT

La figure 4 représente une coupe partielle horizontale du conduit de distribution 23 d'un actionneur 17 (figure 1). Le capot 33 du distributeur comporte une partie inclinée qui vient s'appuyer sur la surface d'extrémité 340 du conduit 23 complémentaire de la surface intérieure correspondante du capot. Cette surface d'extrémité 340 entourant l'orifice 341 comporte une petite nervure 342 ici sensiblement verticale, dépassant cette surface d'une hauteur H de 0, 1 mm et de longueur environ 1 mm. Ce petit relief est suffisant pour que l'appui du capot sur l'extrémité du conduit ne soit pas parfait, donc non étanche à l'air, mais tout de même étanche vis à vis du produit pâteux distribué. L'évacuation d'air du produit pâteux lors de la fermeture du capot est ainsi correctement réalisée du côté de sa distribution.Figure 4 shows a partial horizontal section of the distribution conduit 23 of an actuator 17 (Figure 1). The cover 33 of the dispenser has an inclined part which comes to bear on the end surface 340 of the conduit 23 complementary to the corresponding interior surface of the cover. This end surface 340 surrounding the orifice 341 has a small rib 342 here substantially vertical, projecting from this surface by a height H of 0.1 mm and of length approximately 1 mm. This small relief is sufficient so that the support of the cover on the end of the duct is not perfect, therefore not airtight, but still airtight with respect to the pasty product dispensed. The evacuation of air from the pasty product when the cover is closed is thus correctly carried out on the side of its distribution.

APPLICATIONSAPPLICATIONS

Le distributeur de l'invention rendu inviolable par son relief intérieur transversal, est utilisé typiquement pour le conditionnement et la distribution de produits hygiéniques et cosmétiques, sous forme de pâtes ou de gels, en particulier de pâtes dentifrices, et pour des produits alimentaires sous forme de pâtes ou de crèmes épaisses, par exemple des condiments et des produits de nappage.The dispenser of the invention made inviolable by its transverse internal relief, is typically used for the packaging and distribution of hygienic and cosmetic products, in the form of pastes or gels, in particular toothpastes, and for food products in the form thick pastes or creams, for example condiments and toppings.

Claims (10)

1. A distributor for pasty products, comprising:
a) a body (3) comprising a tubular body (4), a piston (7) sliding in fluid-tight fashion in the inside of the circular cylindrical barrel (5) of the tubular body (4) and comprising itself a flexible flared-out top lip (8) sliding within the barrel (S) to ensure fluid-tightness, a rigid middle portion (4) which is retracted in relation to the inner surface of the said cylindrical barrel (5) and a semi-rigid flared-out bottom end (41) sliding with a slight clearance or with a slightly forced fit inside the said barrel (5), and a tip (9) carrying at least one orifice (341) through which the pasty product can pass to the distributor head (b);
b) a distributor head (2) fixed on the said tip (9) of the said body (3) and comprising with the tip (9) means (10 and 12, 26, 28 and 321) for directing the pasty product from within the tubular body (4) to a distribution duct (23) in the said head (2), by successive extraction and compression movements which result in the said pasty product being expelled towards the said duct (23);
c) possibly a cap (33) provisionally fixed on the head (2); the tubular body (4) and possibly the distribution head (2) comprising air leakage means (35, 342) which do not allow the pasty product to pass, this distributor (1) being characterised in that:
-the flexible lip (8) has a thickness at most equal to 0.4 mm over at least 1 mm from its end and in that
-the means of leaking air from the tubular body (4) when the piston (7) is inserted into the body (4) and until it comes in contact with the pasty product contained therein comprise a transverse interior relief (35, 350) situated at the bottom of the said circular cylindrical barrel (5, 50) and of minimal inside diameter, 0.3 to 1.5 mm smaller than the inside diameter of the said barrel (5, 50) and also a flared-out inlet zone (36, 360) on this relief (35, 350) which has an inside diameter decreasing from an engaging diameter at least equal to the outside diameter of the flexible lip (8) of the piston (7) in its free state, to the said minimal diameter of the said relief (35, 350) and the outside diameter of the middle part (4) of the piston (7) is at least 0.4 mm smaller than the said minimal inside diameter of the said relief (35, 350).
2 . A distributor according to claim 1, in which the outside diameter of the said flexible lip (8) of the piston (7) is by 0.1 to 0.5 mm greater than the inside diameter of the said circular cylindrical barrel (5, 50) of the tubular body (4), characterised in that the said transverse inner relief (35, 350) has a minimal inside diameter which is 0.4 to 1.2 mm smaller than the inside diameter of the said barrel (5, 50).
3. A distributor according to any one of claims 1 or 2, characterised in that the said transverse inner relief (35) comprises one or a plurality of breaks of unitary lengths comprised between 0. 5 and 3 mm.
4. A distributor according to any one of claims 1 to 3, characterised in that the inlet zone (36, 360) of the said transverse inner relief (35, 350) is substantially frustoconical with a cone half-angle of 10 to 25°, its axis (X) being the axis (X) of the circular cylindrical barrel (5, 50) and in that the zone of minimal interior diameter (35, 351) of the said inner relief relief (35, 350) is situated at least 2 mm from the cylindrical inner surface of the said barrel (5, 50).
5. A distributor according to any one of claims 1 to 4, characterised in that the transverse inner relief (350) consists of an inner portion (351, 62) of an added-on base (60), the said portion (351, 62) fitting into the bottom (51) of the said circular cylindrical barrel (50).
6. A distributor according to any one of claims 1 or 2, in the case where a cap is fitted over the distributing head (2), characterised in that the said distributing head (2) comprises air leakage means through which air can escape after fitment of the cap (33) and consisting of a small rib (342) 0.05 to 0.15 mm high, carried by the end surface (340) in the circumference of the distribution orifice (341) of the head (2), the said end surface (340) being flat or convex but matching the corresponding inner surface of the cap (33).
7. A distributor according to any one of claims 1, 2, 3 or 6, characterised in that:
a) the tip (9) of the body (3) carries an orifice (10) and an inlet valve (11 and 12) for the introduction of pasty product, the seat of the valve (11 and 12) being an annular surface (11) engaging around the said orifice (10) while the flap member (12) of this valve (11 and 12) is constituted by an occluding web (13), of which the annular edge (14) is applied in fluid-tight manner on the said annular surface (11) in a position of closure of the valve (11 and 12), and a subjacent portion (15) engaged in the said orifice (10) and provided in its bottom part with retaining bosses (16), the diameter of the cylinder circumscribed at these bosses (16) being greater by 1 to 2 mm than the diameter of the said orifice (10);
b) the distribution head (2) comprises:
-an actuator (17) comprising on the one hand a fixed part (18) comprising an outer barrel (19) carrying in its bottom part a means (20) for the attachment to the tip (9) of the body (3) of the distributor (1) and on the other an inclineable central part (21) connected to the fixed part (18) and comprising a bearing web (22) and distribution duct (23) discharging into a longitudinal channel (24) which is carried by the bottom of the said bearing web (22), fitting in fluid-tight fashion over the upper tube (25) of a deformable dish-shaped member (26) which forms a compression chamber (27) together with the said bearing web (22) and the said tip (9) of the body (3) of the distributor (1), the bottom surface (28) of the said bearing web (22) at the bottom of this channel (24) being flat or slightly curved;
-the said deformable dish-shaped member (26) which is in a single piece and comprises, from the bottom upwardly: a means (29) for fluid-tight fitment on the tip (9) of the body (3) of the distributor (1), then a deformable web (30), then the said upper tube (25) surmounted by a flexible top lip (31) which forms with the said under surface (28) of the bearing web (22) in the bottom of the said channel (24) a valve (28 and 31) for expulsion of product into the said distribution duct (23).
8. A method of inserting a piston (7) into the interior of the tubular body (4) of a distributor (1) containing pasty product, the open end of the said tubular body (4) being at the top, the said piston (7) comprising a flexible flared out top lip (8) of plastics material and having an outside diameter greater by 0.1 to 0.5 mm than the inside diameter of the circular cylindrical barrel (5, 50) of the said tubular body (4) and of a thickness at most equal to 0.4 mm over at least 1 mm from its end, the said lip (8) sliding in fluid-tight fashion within the said barrel (5, 50), in which:
A) the piston (7) is lowered towards the pasty product, its flexible lip (8) being towards the front, ensuring its axial guidance during the course of this downwards movement;
B) the end of the flexible lip (8) is brought into contact with the interior of a flared-out inlet zone (36, 360) in the tubular body (4), of which the diameter then decreases continuously down to a minimum inside diameter of a transverse relief (35, 350), the said minimal diameter being less by 0.3 to 1.5 mm than the inside diameter of the said barrel (5, 50), the end of the flexible lip (8) being pulled in, causing it to pass over this inlet zone (36, 360) and this transverse relief (35, 350), so that small transverse undulations form from the end of this lip (8) allowing the occluded air to escape;
C) movement of the piston (7) is continued, causing it to cross the said inlet zone (36, 360) completely and also the said transverse relief (35, 350) until it comes in contact with the pasty product, the speed of displacement of the piston (7) during the stages (B) and (C) being comprised between 40 and 300 mm/sec so that the said undulations are maintained until the piston (7) stops.
9. Method according to claim 8, in which the speed of travel of the piston (7) having the flexible lip (8) is, for stages (B) and (C), comprised between 80 and 150 mm/sec.
10. Method according to claim 9, in which:
-the outside diameter of the flexible lip (8) is 0.2 to 0.4 mm larger than the inside diameter of the circular cylindrical barrel (5,50);
-the flared-out inlet zone (36) of the tubular body is substantially frustoconical with a cone half-angle 0 comprised between 10 and 25°;
-the cylindrical inner surface of the barrel (5, 50) is regained, less 2 mm, after the zone of minimal inside diameter (35, 352) of the transverse relief (35, 350) of the tubular body (4).
EP87420299A 1986-11-03 1987-10-30 Dispenser for viscous products and method of introducing the piston into it Expired - Lifetime EP0270467B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87420299T ATE57666T1 (en) 1986-11-03 1987-10-30 DISPENSER FOR PASTOESE PRODUCTS AND PISTON INSERTION METHOD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8615443A FR2605983B1 (en) 1986-11-03 1986-11-03 DISPENSER FOR PASTY PRODUCT AND METHOD FOR INTRODUCING ITS PISTON WITHIN ITS TUBULAR BODY
FR8615443 1986-11-03

Publications (2)

Publication Number Publication Date
EP0270467A1 EP0270467A1 (en) 1988-06-08
EP0270467B1 true EP0270467B1 (en) 1990-10-24

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ID=9340569

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Application Number Title Priority Date Filing Date
EP87420299A Expired - Lifetime EP0270467B1 (en) 1986-11-03 1987-10-30 Dispenser for viscous products and method of introducing the piston into it

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US (1) US4809887A (en)
EP (1) EP0270467B1 (en)
AT (1) ATE57666T1 (en)
DE (1) DE3765757D1 (en)
DK (1) DK572287A (en)
ES (1) ES2018571B3 (en)
FI (1) FI874812A (en)
FR (1) FR2605983B1 (en)
GR (1) GR3001029T3 (en)
IS (1) IS1399B6 (en)
NO (1) NO874541L (en)

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EP0351441A1 (en) * 1988-07-21 1990-01-24 Alfred Fischbach Kunststoffspritzgusswerk Cartridge for plastic masses
FR2649967B1 (en) * 1989-07-19 1991-09-20 Cebal METHOD OF INTRODUCING A SEALED SLIDING LID INTO A TUBULAR BODY AND CORRESPONDING DEVICE
US5052592A (en) * 1989-08-14 1991-10-01 Bramlage Gesellschaft Mit Beschrankter Haftung Dispenser for paste compositions
FR2690422B1 (en) * 1992-04-22 1995-03-31 Sofab Dispenser for fluid products.
US5449094A (en) * 1992-05-18 1995-09-12 Sofab Dispenser with plunging sleeve
IT1256628B (en) * 1992-12-04 1995-12-12 DISPENSER OF FLUID SUBSTANCES, WITH DEFORMABLE HEAD
US5961007A (en) * 1998-06-15 1999-10-05 The Procter & Gamble Company Dispensing package
NL1023670C1 (en) * 2002-07-03 2004-01-06 Keltub B V Assembly of bellows and unrolling part, pump and method for the use thereof.
FR2900643B1 (en) * 2006-05-05 2008-10-10 Airlessystems Soc Par Actions FLUID PRODUCT DISPENSING MEMBER AND DISPENSER COMPRISING SUCH A DISPENSING MEMBER
FR2948861B1 (en) * 2009-08-07 2013-08-30 Chanel Parfums Beaute COSMETIC PRODUCT DEVICE HAVING DISTRIBUTION ORIFICE
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FR3068265B1 (en) * 2017-06-28 2022-02-25 Gb Dev FLUID DISPENSER BY PRESSURE ON A DEFORMABLE WALL OF THE CONTAINER
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Also Published As

Publication number Publication date
IS3276A7 (en) 1988-05-04
IS1399B6 (en) 1989-12-15
NO874541L (en) 1988-05-04
GR3001029T3 (en) 1992-01-20
ES2018571B3 (en) 1991-04-16
US4809887A (en) 1989-03-07
FR2605983B1 (en) 1988-12-02
FR2605983A1 (en) 1988-05-06
NO874541D0 (en) 1987-11-02
FI874812A (en) 1988-05-04
ATE57666T1 (en) 1990-11-15
DE3765757D1 (en) 1990-11-29
DK572287A (en) 1988-05-04
FI874812A0 (en) 1987-11-02
DK572287D0 (en) 1987-11-02
EP0270467A1 (en) 1988-06-08

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