WO2000047492A1 - Pressurised dispenser container base with two aluminium alloy chambers - Google Patents

Pressurised dispenser container base with two aluminium alloy chambers Download PDF

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Publication number
WO2000047492A1
WO2000047492A1 PCT/FR2000/000297 FR0000297W WO0047492A1 WO 2000047492 A1 WO2000047492 A1 WO 2000047492A1 FR 0000297 W FR0000297 W FR 0000297W WO 0047492 A1 WO0047492 A1 WO 0047492A1
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WO
WIPO (PCT)
Prior art keywords
aluminum alloy
portions
orifice
toric
wall
Prior art date
Application number
PCT/FR2000/000297
Other languages
French (fr)
Inventor
Jacques Granger
Lionel Cornet
Original Assignee
Cebal S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cebal S.A. filed Critical Cebal S.A.
Priority to DE60003889T priority Critical patent/DE60003889T2/en
Priority to EP00903753A priority patent/EP1150906B1/en
Priority to AU25540/00A priority patent/AU2554000A/en
Publication of WO2000047492A1 publication Critical patent/WO2000047492A1/en

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Classifications

    • 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
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/42—Filling or charging means

Definitions

  • the invention relates to aluminum alloy housings dispensing under pressure liquid, creamy or pasty products. More precisely, it relates to housings offering a sealed separation between the product to be dispensed and the propellant gas, the product being separated from the gas either by an internal pocket or by a piston. While the outer case is made of aluminum alloy, the pocket or the piston can be made of any metallic or plastic material. The separation of the product and the propellant gas makes it possible in particular to avoid the modification of the characteristics of the product under the effect of prolonged contact with the propellant gas.
  • the steel housings are made in three parts: a dome, a cylindrical wall and a bottom.
  • the bottom is a thin stamped disc (less than 0.3mm thick) and shallow which is then crimped onto the cylindrical wall. Formatting a bottom intended to accommodate a nozzle such as the Nicholson nozzle does not pose too many problems, it is easy to produce an annular bowl 12 delimited by a cylindrical wall on the outside and another cylindrical wall 13 of low height which constitutes the wall of the hole orifice. Such a bowl shape allows you to take full advantage of the particular shape of the Nicholson mouthpiece.
  • the Nicholson nozzle has two annular grooves with slightly different throat diameters.
  • the bottom of the upper annular groove 17, close to the end of the end piece, surmounted by the upper bead 16, has a smaller radius than the bottom of the lower groove 22, close to the base of the end piece, surmounted by the bead 21.
  • the endpiece is half pressed into the bowl. It is retained by simple contact, possibly with a slight tightening, of the lower wall of the upper bead 16 with the upper end 18 of the cylindrical wall 13. In this position, the longitudinal grooves 28 of the endpiece allow communication between the lower part of the case and the outside. This is how the box is delivered to the conditioner, that is to say equipped with the Nicholson tip half pressed into the bottom.
  • the conditioner fills the upper compartment with the product to be dispensed, injects the propellant under pressure into the lower housing of the housing - the passage of the gas being carried out thanks to the longitudinal grooves 28 -, then pushes the endpiece all the way.
  • the hermetic sealing of the housing is obtained by plating over its entire height the cylindrical wall 13 against the bottom of the lower annular groove 22. A slight tightening is ensured by giving the diameter at rest of the elastomer end piece a slightly higher value to that of the diameter of the cylindrical wall 13.
  • the aluminum alloy housings are produced in one or two pieces: the bottom and the cylindrical wall are obtained simultaneously by impact spinning from a pin, possibly followed by drawing.
  • the dome is either attached and crimped (two pieces) or obtained by conification of the upper end of the cylindrical wall (one piece).
  • the absence of a crimping bead in the lower part of the case (one and two-piece cases) and in the upper part (one-piece cases) gives aluminum alloy cases a particularly appreciated aesthetic appearance.
  • the Nicholson endpiece used as standard on steel cases has never been able to hermetically seal the lower part of aluminum alloy cases. It is supposed that the main reason lies in the fact that the bottom of aluminum alloy, obtained by impact spinning, is generally thicker than cannot be a deep-drawn steel bottom: it generally has a thickness greater than 0.5 mm. It is not possible under these conditions to produce a bowl shape such as that described in US 3,522,900. In particular, it is difficult to produce the cylindrical wall 13, which, having to be housed over its entire height in the groove lower ring to ensure tight sealing, should have a height ( ⁇ 0.7 mm) barely greater than the thickness of the bottom.
  • the injection of the propellant gas through the elastomeric strand is more difficult to achieve than in the case of steel bottoms provided with their Nicholson endpiece.
  • the propellant gas injection devices which must respect a production rate adapted to the industrial conditions of the conditioners, prove to be much more expensive than those used with steel casings.
  • the tip has a diameter which can only be slightly greater than that of the hole and, due to this weak tightening and the hole caused by the needle, the seal offered by the strand is not perfect.
  • the Applicant has sought to remedy these defects by trying to improve the economic position of the aluminum case compared to that of the steel case, already handicapped by the material cost and the transformation cost and while retaining the advantageous aesthetic appearance. linked to the absence of a crimping bead at the base of the case.
  • the object of the invention is an aluminum alloy case having a new bottom of particular shape.
  • Another object of the invention is the method which makes it possible to shape such a box.
  • the housing according to the invention has a bottom having a conventional overall shape, that is to say spherical concave, but, in the vicinity of the central hole, the wall has a particular shape.
  • Figure 1 we can describe, starting from the outside and moving towards the axis, the central part of the bottom perforated by the following geometric portions: first a spherical portion S, similar to the conventional spherical portion of the distributor housing base in alloy aluminum, whose concavity is oriented downwards, then a succession of three toric portions A, B and C having alternately an upward concavity (A), downward (B), the last portion (C) having an upward concavity.
  • the portions connect to each other tangentially, the connection point between each pair of adjacent portions is an inflection point.
  • the tangents to the inflection points, border points between the portions S and A on the one hand and B and C on the other hand, are substantially horizontal, preferably rising and inclined by less than 30 ° for the first, descending and inclined less than 10 ° for the second.
  • the tangent to the point of inflection, border between the portions A and B, is substantially parallel to the axis, preferably inclined more than 60 ° relative to the horizontal.
  • the shape which results from the succession of the portions S, A and B constitutes a bowl intended to collect the base of the Nicholson nozzle: when the nozzle is fully inserted, its base is housed in the bowl, which improves its protection vis-à-vis any brutal lateral movement of a foreign body coming into contact with the bottom.
  • the last toric portion (C) has a wall of non-horizontal thickness.
  • the lower angle of this wall determines the calibrated diameter of the orifice.
  • the latter is a few tenths of a millimeter lower than that of the bottom of the upper groove of the Nicholson nozzle and almost one millimeter less than that of the bottom of the lower annular groove of this same nozzle.
  • the tightening of the elastomer end piece is aimed at by the bottom angle of the wall of thickness of the bottom, whatever the insertion position of the end piece, the bottom having no cylindrical wall around the hole.
  • the inclination of the wall of thickness has the advantage of ensuring good retention of the nozzle and a perfect seal (in the fully depressed position), whatever the thickness from the bottom, since it is its lower angle which calibrates the hole and which acts by clamping on the nozzle.
  • a firm hold of the end cap on the bottom of the housing is ensured, whether the end cap is pressed in half or completely. Thanks to the deformation of the elastomer end piece under the effect of the lower angle of the thickness wall, a tight hold is ensured when the end piece is pushed in fully.
  • the blank is generally placed on a turntable, where, by buffering in several passes, the bottom is formed (spinning alone) or finished (spinning-stretching), the cropped end of the cylindrical wall is conified then the end edge is rolled, so as to produce the bead for fixing the valve cup.
  • a complementary shaping comprising three stages which do not necessarily follow in time and consisting of a perforation of the central hole of the already domed bottom, in a preforming of the bowl, and in a final shaping of the thick wall bordering the hole.
  • pairs of tools with complementary shapes, of the punch and die type are used so as to properly support and make repetitive the deformation of the bowl and the inclination of the wall. thick.
  • Each of these additional stages can be introduced during the trimming, during the possible stretching or at the first stages of the conification
  • the bottom under the effect of the polnUSin, is supported on a bending pad and takes an overall shape of a spherical bulge.
  • the base is placed on a matrix having, above the conventional spherical bulge of the bending block, an appendage corresponding in relief to the bowl to be produced, but with a horizontal top wall.
  • the compression of the central part of the bottom between punch and die gives a first form of bowl blank, having a horizontal bottom.
  • the punch and the die being held close together to block the spherical wall of the bottom and the external edge of the bowl, a movable finger sliding in the axis of the die, of diameter greater than the diameter of the perforation hole, performs an axial movement towards the top and slightly turns the internal edge of the bowl while calibrating the diameter of the perforated hole.
  • the choice of the perforation diameter depends on the thickness of the bottom and the inclination sought for the thickness wall bordering the hole: for a standard Nicholson joint, it is preferably close to 45 °. It goes without saying that it could be adapted to any other form of Nicholson type joint, that is to say any geometry of joint having two annular grooves and at least a longitudinal groove allowing the filling of the propellant gas in a first insertion position and then the hermetic storage of said propellant gas in a second insertion position. What matters is that the inclination of the wall is such that, even if the bottom has a greater thickness, the lower angle of the end wall continues to be easily accommodated at the bottom of the lower annular groove by imposing a tightening close to 1 mm. Such a bottom wall geometry is therefore well suited to the installation of a Nicholson type end piece, whatever the thickness of the bottom and, obviously, whatever the material of the bottom.
  • Figure 1 shows at the top a section through a diametrical plane of the central part of the bottom of the housing according to the invention and below a section of a standard Nicholson tip.
  • Figure 2 shows in section through a diametrical plane the tip half pressed into the bottom, in the position it occupies at the time of the injection of the propellant.
  • Figure 3 shows in section through a diametrical plane the tip fully inserted, hermetically sealing the lower part of the housing filled with propellant.
  • EXAMPLE Figures 1, 2 and 3
  • the Nicholson tip 10 shortly before its insertion into the bottom 1, shown here only by its central part 2, perforated with an orifice 3 at the axis. It has two annular grooves 17 and 22, the diameters of the bottom of the groove are slightly different.
  • the bottom of the upper annular groove 17, close to the end of the end piece, surmounted by the upper bead 16, has a radius of ⁇ 2.7 mm, smaller than that of the bottom of the lower groove 22, close to the base 27 of the nozzle, surmounted by the bead 21, the latter being equal to approximately 3.05 mm.
  • the lower wall 19 of the upper annular groove 17 is frustoconical, inclined at about 60 °.
  • the lower annular groove 22 has a height of ⁇ 0.7 mm.
  • the base 27 of the endpiece has a diameter of approximately 8.7 mm.
  • the upper bead 16 has a diameter of approximately 6J mm and the lower bead 21 has a diameter of 6.6 mm.
  • the central part 2 of the perforated bottom has the following geometric portions: first a spherical portion S, similar to the conventional spherical portion of the distributor housing bottoms made of aluminum alloy, the concavity of which is oriented downwards, then a succession of three toric portions A, B and C.
  • the toric portion A having an upward concavity, has a section in the shape of a circular sector with a thickness of 0.5 mm, the center of which is 6.705 mm from the axis and the outside radius RA of which is equal to 2 mm.
  • the toric portion B having a downward concavity, has a section in the shape of a circular sector with a thickness of 0.5 mm, the center of which is 3.93 mm from the axis and whose internal radius RB is equal to 1 mm.
  • the toric portion C having an upward concavity, has a section in the shape of a circular sector with a thickness of 0.5 mm, the center of which is 3.725 mm from the axis and the outside radius RC of which is equal to 1, 3 mm.
  • L ⁇ tangent to the inflection point L, border point between the portions S and A makes an angle of 14 ° with the horizontal.
  • the tangent to the inflection point M, the border point between the portions A and B makes an angle of 66 ° with the axis.
  • the tangent to the inflection point N, the border point between the portions B and C is descending and makes an angle of 4 ° with the horizontal.
  • the wall of thickness 4 is inclined by 46 ° relative to the horizontal and its lower angle 5 calibrates the orifice with the diameter 5J mm.
  • the Nicholson nozzle 10 is shown half pressed into the bowl 12. It is retained with a slight tightening (0.3mm) of the lower angle 5 of the wall of thickness 4 on the bottom of the upper annular groove 17.
  • the Nicholson end piece 10 is shown fully inserted into the bowl 12. It is retained with a tightening of almost 1 mm from the lower angle 5 of the thickness wall 4 on the bottom of the annular groove lower 17. In the vicinity of the clamping zone, the end piece is slightly deformed. The thick wall has a slight inclination, so that the tightening is carried out only at the level of the lower angle.
  • the outer wall of the bottom at the point of inflection N, border point between the toric parts B and C, is almost horizontal, which makes it possible not to deform the base 27 of the Nicholson tip 10 too much.
  • the thickness of the bottom has no influence on the quality of the contact, from the moment when the metallic bottom is clearly more rigid than the elastomer end piece.
  • the spherical part S, the toric part A and a large part of the spherical part B are kept embedded between die and punch and an axial finger of 5J mm in diameter rises by turning the initially horizontal bottom of the bowl which is pressed against a locally convex part of the generally concave wall of the punch thereby achieving the toric portion C.
  • the thickness of the bottom is indifferent with regard to the maintenance of the Nicholson tip and the tightness of its closure, it is not indifferent with respect to the shaping conditions and the determination of the diameter initial perforation.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Abstract

The invention concerns a pressurised aluminium alloy container dispensing under pressure products ranging from liquid to pasty having a base (1) whereof the central part (2) is bored with an orifice (3) designed to be closed with a Nicholson-type nozzle (10), wherein said central part (2) of the base (1) comprises a spherical portion (S), whereof the concavity is oriented downwards, and the three toric portions have a concavity oriented upwards (A), downwards (B) and upwards alternately. The portions are tangentially connected to one another, the connection point (L, M, N) being a inflection point. The slope at point M is substantially horizontal. The last toric portion (C) has a thickness wall (4) whereof the lower angle (5) delimits said orifice (3) and the inclination ranges between 30° and 60°. The method for making such a container base comprises three additional steps whereby the base (1) central part (2) is preformed, bored and subsequently formed.

Description

FOND DE BOITIER DISTRIBUTEUR SOUS PRESSION A DEUX CHAMBRES EN TWO-CHAMBER PRESSURE DISTRIBUTOR HOUSING BOTTOM
ALLIAGE D'ALUMINIUMALUMINUM ALLOY
DOMAINE TECHNIQUETECHNICAL AREA
L'invention concerne les boîtiers en alliage d'aluminium distribuant sous pression des produits liquides, crémeux ou pâteux. Plus précisément elle concerne les boîtiers offrant une séparation étanche entre le produit à distribuer et le gaz propulseur, le produit étant séparé du gaz soit par une poche interne, soit par un piston. Alors que le boîtier externe est en alliage d'aluminium, la poche ou le piston peut être en tout matériau métallique ou plastique. La séparation du produit et du gaz propulseur permet notamment d'éviter la modification des caractéristiques du produit sous l'effet d'un contact prolongé avec le gaz propulseur.The invention relates to aluminum alloy housings dispensing under pressure liquid, creamy or pasty products. More precisely, it relates to housings offering a sealed separation between the product to be dispensed and the propellant gas, the product being separated from the gas either by an internal pocket or by a piston. While the outer case is made of aluminum alloy, the pocket or the piston can be made of any metallic or plastic material. The separation of the product and the propellant gas makes it possible in particular to avoid the modification of the characteristics of the product under the effect of prolonged contact with the propellant gas.
ETAT DE LA TECHNIQUESTATE OF THE ART
La partie supérieure du boîtier distributeur étant destinée à être remplie par le produit, l'injection du gaz propulseur est effectuée plus simplement et plus économiquement par le fond. Pour ce faire, on ménage un trou dans le milieu du fond que l'on bouche après injection du gaz propulseur. Beaucoup de bouchons ont été proposés dans le passé et, actuellement, le bouchon le plus couramment utilisé sur les boîtiers en acier a été décrit dans le brevet US 3 522 900. Nous appellerons par la suite ce bouchon "embout Nicholson", et pour la description de cet art antérieur, nous utiliserons les références numérotées relatives aux figures 1 , 5 et 6 de US 3 522 900.The upper part of the distributor box being intended to be filled with the product, the injection of the propellant gas is carried out more simply and more economically from the bottom. To do this, a hole is made in the middle of the bottom which is plugged after injection of the propellant. Many plugs have been proposed in the past and, currently, the most commonly used plug on steel cases has been described in US Pat. No. 3,522,900. We will call this plug "Nicholson tip" below, and for the description of this prior art, we will use the numbered references relating to FIGS. 1, 5 and 6 of US 3,522,900.
Les boîtiers en acier sont réalisés en trois pièces: un dôme, une paroi cylindrique et un fond. Le fond est un disque embouti mince (moins de 0,3mm d'épaisseur) et peu profond que l'on sertit ensuite sur la paroi cylindrique. La mise en forme d'un fond destiné à accueillir un embout tel que l'embout Nicholson ne pose pas trop de problèmes, on peut réaliser facilement une cuvette annulaire 12 délimitée par une paroi cylindrique à l'extérieur et d'une autre paroi cylindrique 13 de faible hauteur qui constitue la paroi de l'orifice du trou. Une telle forme de cuvette permet de profiter pleinement de la forme particulière de l'embout Nicholson.The steel housings are made in three parts: a dome, a cylindrical wall and a bottom. The bottom is a thin stamped disc (less than 0.3mm thick) and shallow which is then crimped onto the cylindrical wall. Formatting a bottom intended to accommodate a nozzle such as the Nicholson nozzle does not pose too many problems, it is easy to produce an annular bowl 12 delimited by a cylindrical wall on the outside and another cylindrical wall 13 of low height which constitutes the wall of the hole orifice. Such a bowl shape allows you to take full advantage of the particular shape of the Nicholson mouthpiece.
L'embout Nicholson possède deux gorges annulaires dont les diamètres de fond de gorge sont légèrement différents. Le fond de la gorge annulaire supérieure 17, proche de l'extrémité de l'embout, surmontée du bourrelet supérieur 16, a un rayon plus faible que le fond de la gorge inférieure 22, proche de la base de l'embout, surmonté du bourrelet 21. Dans un premier temps, l'embout est à moitié enfoncé dans la cuvette. Il est retenu par simple contact, éventuellement avec un léger serrage, de la paroi inférieure du bourrelet supérieur 16 avec l'extrémité supérieure 18 de la paroi cylindrique 13. Dans cette position, les rainures longitudinales 28 de l'embout permettent une communication entre la partie inférieure du boîtier et l'extérieur. C'est ainsi que le boîtier est livré au conditionneur, c'est-à-dire équipé de l'embout Nicholson à moitié enfoncé dans le fond. Le conditionneur remplit le compartiment supérieur avec le produit à distribuer, injecte le gaz propulseur sous pression dans le logement inférieur du boîtier - le passage du gaz étant réalisé grâce aux rainures longitudinales 28 -, puis enfonce l'embout à fond. Le scellage hermétique du boîtier est obtenu grâce au plaquage sur toute sa hauteur de la paroi cylindrique 13 contre le fond de la gorge annulaire inférieure 22. Un léger serrage est assuré en donnant au diamètre au repos de l'embout en élastomère une valeur légèrement supérieure à celle du diamètre de la paroi cylindrique 13.The Nicholson nozzle has two annular grooves with slightly different throat diameters. The bottom of the upper annular groove 17, close to the end of the end piece, surmounted by the upper bead 16, has a smaller radius than the bottom of the lower groove 22, close to the base of the end piece, surmounted by the bead 21. At first, the endpiece is half pressed into the bowl. It is retained by simple contact, possibly with a slight tightening, of the lower wall of the upper bead 16 with the upper end 18 of the cylindrical wall 13. In this position, the longitudinal grooves 28 of the endpiece allow communication between the lower part of the case and the outside. This is how the box is delivered to the conditioner, that is to say equipped with the Nicholson tip half pressed into the bottom. The conditioner fills the upper compartment with the product to be dispensed, injects the propellant under pressure into the lower housing of the housing - the passage of the gas being carried out thanks to the longitudinal grooves 28 -, then pushes the endpiece all the way. The hermetic sealing of the housing is obtained by plating over its entire height the cylindrical wall 13 against the bottom of the lower annular groove 22. A slight tightening is ensured by giving the diameter at rest of the elastomer end piece a slightly higher value to that of the diameter of the cylindrical wall 13.
Malheureusement, cet embout, parfaitement adapté aux boîtiers en acier, n'a jamais pu être utilisé sur des boîtiers en alliage d'aluminium. Les boîtiers en alliage d'aluminium sont réalisés en une ou deux pièces: le fond et la paroi cylindrique sont obtenus simultanément par filage par choc d'un pion, suivi éventuellement d'un étirage. Le dôme est soit rapporté et serti (deux pièces) soit obtenu par conification de l'extrémité supérieure de la paroi cylindrique (une pièce). L'absence de bourrelet de sertissage en partie inférieure du boîtier (boîtiers une et deux pièces) et en partie supérieure (boîtiers une pièce) confère aux boîtiers en alliage d'aluminium un aspect esthétique particulièrement apprécié.Unfortunately, this tip, perfectly suited to steel cases, has never been used on aluminum alloy cases. The aluminum alloy housings are produced in one or two pieces: the bottom and the cylindrical wall are obtained simultaneously by impact spinning from a pin, possibly followed by drawing. The dome is either attached and crimped (two pieces) or obtained by conification of the upper end of the cylindrical wall (one piece). The absence of a crimping bead in the lower part of the case (one and two-piece cases) and in the upper part (one-piece cases) gives aluminum alloy cases a particularly appreciated aesthetic appearance.
Jusqu'à la présente invention, l'embout Nicholson utilisé en standard sur les boîtiers en acier, n'a jamais pu assurer le bouchage hermétique de la partie inférieure des boîtiers en alliage d'aluminium. On suppose que la raison principale réside dans le fait que le fond en alliage d'aluminium, obtenu par filage par choc, est en général plus épais que ne peut l'être un fond embouti en acier: il a en général une épaisseur supérieure à 0,5 mm. Il n'est pas possible dans ces conditions de réaliser une forme de cuvette telle que celle décrite dans US 3 522 900. En particulier, il est difficile de réaliser la paroi cylindrique 13, qui, devant se loger sur toute sa hauteur dans la gorge annulaire inférieure pour assurer un bouchage étanche, devrait avoir une hauteur (≈ 0,7 mm) à peine supérieure à l'épaisseur du fond.Until the present invention, the Nicholson endpiece used as standard on steel cases, has never been able to hermetically seal the lower part of aluminum alloy cases. It is supposed that the main reason lies in the fact that the bottom of aluminum alloy, obtained by impact spinning, is generally thicker than cannot be a deep-drawn steel bottom: it generally has a thickness greater than 0.5 mm. It is not possible under these conditions to produce a bowl shape such as that described in US 3,522,900. In particular, it is difficult to produce the cylindrical wall 13, which, having to be housed over its entire height in the groove lower ring to ensure tight sealing, should have a height (≈ 0.7 mm) barely greater than the thickness of the bottom.
Les fabricants de boîtiers distributeurs sous pression à deux compartiments en alliage d'aluminium ont alors mis au point une solution différente, qui consiste à faire un simple trou au milieu du fond et à le remplir aussitôt par un toron en matière élastomère. Une fois livré ainsi au conditionneur, ce dernier utilise un dispositif d'injection du gaz comprimé qui consiste à faire traverser de part en part le toron à l'aide d'une aiguille creuse. Après injection du gaz propulseur passant par l'aiguille, on enlève cette aiguille, en comptant sur le retour élastique de l'élastomère pour reboucher le trou occasionné par l'aiguille. La demande FR-A-2 141 282 donne un exemple de toron permettant de boucher le fond d'un boîtier de distribution sous pression en alliage d'aluminium.Manufacturers of pressure distributing boxes with two compartments in aluminum alloy then developed a different solution, which consists in making a simple hole in the middle of the bottom and filling it immediately with a strand of elastomeric material. Once delivered to the conditioner, the latter uses a compressed gas injection device which consists of passing right through the strand using a hollow needle. After injecting the propellant passing through the needle, we remove this needle, counting on the elastic return of the elastomer to fill the hole caused by the needle. The application FR-A-2 141 282 gives an example of a strand for plugging the bottom of a pressure distribution box made of aluminum alloy.
L'injection du gaz propulseur au travers du toron en élastomère est plus difficile à réaliser que dans le cas des fonds en acier munis de leur embout Nicholson. Les dispositifs d'injection du gaz propulseur, devant respecter une cadence de production adaptée aux conditions industrielles des conditionneurs, se révèlent nettement plus coûteux que ceux qui sont utilisés avec les boîtiers en acier. De plus, pour être enfoncé dans le trou, l'embout a un diamètre qui ne peut être que légèrement supérieur à celui du trou et, en raison de ce faible serrage et du trou occasionné par l'aiguille, l'étanchéité offerte par le toron n'est pas parfaite.The injection of the propellant gas through the elastomeric strand is more difficult to achieve than in the case of steel bottoms provided with their Nicholson endpiece. The propellant gas injection devices, which must respect a production rate adapted to the industrial conditions of the conditioners, prove to be much more expensive than those used with steel casings. In addition, to be pressed into the hole, the tip has a diameter which can only be slightly greater than that of the hole and, due to this weak tightening and the hole caused by the needle, the seal offered by the strand is not perfect.
PROBLEME POSEPROBLEM
La demanderesse a cherché à remédier à ces défauts en essayant d'améliorer la position économique du boîtier en aluminium par rapport à celle du boîtier en acier, déjà handicapée par le coût matière et le coût de transformation et tout en conservant l'aspect esthétique avantageux lié à l'absence d'un bourrelet de sertissage à la base du boîtier.The Applicant has sought to remedy these defects by trying to improve the economic position of the aluminum case compared to that of the steel case, already handicapped by the material cost and the transformation cost and while retaining the advantageous aesthetic appearance. linked to the absence of a crimping bead at the base of the case.
OBJET DE L'INVENTIONOBJECT OF THE INVENTION
L'objet de l'invention est un boîtier en alliage d'aluminium possédant un nouveau fond de forme particulière. Un autre objet de l'invention est le procédé qui permet de mettre en forme un tel boîtier.The object of the invention is an aluminum alloy case having a new bottom of particular shape. Another object of the invention is the method which makes it possible to shape such a box.
Le boîtier selon l'invention présente un fond ayant une forme globale conventionnelle, c'est-à-dire concave sphérique, mais, au voisinage du trou central la paroi présente une forme particulière. A l'aide de la figure 1 , on peut décrire, en partant de l'extérieur et en se dirigeant vers l'axe, la partie centrale du fond perforé par les portions géométriques suivantes: d'abord une portion sphérique S, semblable à la portion sphérique conventionnelle des fonds de boîtier distributeurs en alliage d'aluminium, dont la concavité est orientée vers le bas, ensuite une succession de trois portions toriques A, B et C présentant alternativement une concavité vers le haut (A), vers le bas (B), la dernière portion (C) présentant une concavité vers le haut. Les portions se raccordent entre elles tangentiellement, le point de raccord entre chaque couple de portions adjacentes est un point d'inflexion. Les tangentes aux points d'inflexion, points frontières entre les portions S et A d'une part et B et C d'autre part, sont sensiblement horizontales, de préférence montante et inclinée de moins de 30° pour la première, descendante et inclinée de moins de 10° pour la seconde. La tangente au point d'inflexion, frontière entre les portions A et B, est sensiblement parallèle à l'axe, inclinée de préférence de plus de 60° par rapport à l'horizontale.The housing according to the invention has a bottom having a conventional overall shape, that is to say spherical concave, but, in the vicinity of the central hole, the wall has a particular shape. Using Figure 1, we can describe, starting from the outside and moving towards the axis, the central part of the bottom perforated by the following geometric portions: first a spherical portion S, similar to the conventional spherical portion of the distributor housing base in alloy aluminum, whose concavity is oriented downwards, then a succession of three toric portions A, B and C having alternately an upward concavity (A), downward (B), the last portion (C) having an upward concavity. The portions connect to each other tangentially, the connection point between each pair of adjacent portions is an inflection point. The tangents to the inflection points, border points between the portions S and A on the one hand and B and C on the other hand, are substantially horizontal, preferably rising and inclined by less than 30 ° for the first, descending and inclined less than 10 ° for the second. The tangent to the point of inflection, border between the portions A and B, is substantially parallel to the axis, preferably inclined more than 60 ° relative to the horizontal.
La forme qui résulte de la succession des portions S, A et B constitue une cuvette destinée à recueillir la base de l'embout Nicholson: lorsque l'embout est enfoncé à fond, sa base est logée dans la cuvette, ce qui améliore sa protection vis-à-vis de tout mouvement latéral brutal d'un corps étranger arrivant en contact avec le fond.The shape which results from the succession of the portions S, A and B constitutes a bowl intended to collect the base of the Nicholson nozzle: when the nozzle is fully inserted, its base is housed in the bowl, which improves its protection vis-à-vis any brutal lateral movement of a foreign body coming into contact with the bottom.
La dernière portion torique (C) présente une paroi d'épaisseur non horizontale. L'angle inférieur de cette paroi détermine le diamètre calibré de l'orifice. Ce dernier est inférieur de quelques dixièmes de millimètre à celui du fond de la gorge supérieure de l'embout Nicholson et de près de un millimètre à celui du fond de la gorge annulaire inférieure de ce même embout. Dans les deux cas, on vise un serrage de l'embout en élastomère par l'angle inférieur de la paroi d'épaisseur du fond, quelle que soit la position d'enfoncement de l'embout, le fond ne possédant pas de paroi cylindrique autour de l'orifice. L'inclinaison de la paroi d'épaisseur, de préférence comprise entre 30 et 60°, présente l'avantage d'assurer un bon maintien de l'embout et une parfaite étanchéité (en position totalement enfoncée), quelle que soit l'épaisseur du fond, puisque c'est son angle inférieur qui calibre le trou et qui agit par serrage sur l'embout. En effet, grâce au contact de sa paroi d'épaisseur inclinée contre la paroi inférieure de l'un ou l'autre des bourrelets de l'embout et au serrage de sa paroi intérieure contre le fond des gorges, un maintien ferme de l'embout sur le fond du boîtier est assuré, que l'embout soit enfoncé à moitié ou complètement. Grâce à la déformation de l'embout en élastomère sous l'effet de l'angle inférieur de la paroi d'épaisseur, un maintien étanche est assuré lorsque l'embout est enfoncé à fond.The last toric portion (C) has a wall of non-horizontal thickness. The lower angle of this wall determines the calibrated diameter of the orifice. The latter is a few tenths of a millimeter lower than that of the bottom of the upper groove of the Nicholson nozzle and almost one millimeter less than that of the bottom of the lower annular groove of this same nozzle. In both cases, the tightening of the elastomer end piece is aimed at by the bottom angle of the wall of thickness of the bottom, whatever the insertion position of the end piece, the bottom having no cylindrical wall around the hole. The inclination of the wall of thickness, preferably between 30 and 60 °, has the advantage of ensuring good retention of the nozzle and a perfect seal (in the fully depressed position), whatever the thickness from the bottom, since it is its lower angle which calibrates the hole and which acts by clamping on the nozzle. Indeed, thanks to the contact of its inclined thickness wall against the lower wall of one or other of the beads of the end piece and the tightening of its inner wall against the bottom of the grooves, a firm hold of the end cap on the bottom of the housing is ensured, whether the end cap is pressed in half or completely. Thanks to the deformation of the elastomer end piece under the effect of the lower angle of the thickness wall, a tight hold is ensured when the end piece is pushed in fully.
Plusieurs variantes du procédé de fabrication des boîtiers en alliage d'aluminium existent, toutes caractérisées par une première phase de filage par choc d'un pion cylindrique. Une phase optionnelle d'étirage permet notamment de calibrer le diamètre et l'épaisseur de la paroi cylindrique. En général le fond est prédéformé à cette phase, lorsqu'elle existe. Ensuite l'extrémité ouverte de la paroi cylindrique est rognée, l'ébauche de boîtier est dégraissée, éventuellement recouverte intérieurement de vernis et extérieurement de laque. Dans la dernière phase, appelée globalementSeveral variants of the manufacturing process for aluminum alloy housings exist, all characterized by a first phase of impact spinning of a cylindrical pin. An optional stretching phase makes it possible in particular to calibrate the diameter and the thickness of the cylindrical wall. In general, the background is preformed at this phase, when it exists. Then the open end of the cylindrical wall is trimmed, the housing blank is degreased, possibly covered internally with varnish and externally with lacquer. In the last phase, called globally
"conification", l'ébauche est en général placée sur un plateau tournant, où, par tamponnage en plusieurs passes, la mise en forme du fond est réalisée (filage seul) ou finie (filage-étirage), l'extrémité rognée de la paroi cylindrique est conifiee puis le bord extrême est roulé, de façon à réaliser le bourrelet de fixation de la coupelle de valve."conification", the blank is generally placed on a turntable, where, by buffering in several passes, the bottom is formed (spinning alone) or finished (spinning-stretching), the cropped end of the cylindrical wall is conified then the end edge is rolled, so as to produce the bead for fixing the valve cup.
Il est possible d'introduire en plusieurs endroits de cette chaîne de fabrication aux multiples variantes une mise en forme complémentaire, comportant trois étapes qui ne se suivent pas nécessairement dans le temps et consistant en une perforation du trou central du fond déjà bombé, en un préformage de la cuvette, et en une mise en forme finale de la paroi d'épaisseur bordant le trou. Au cours des étapes de préformage et de mise en forme finale, on utilise des couples d'outils aux formes complémentaires, de type poinçon et matrice de façon à bien accompagner et à rendre répétitive la déformation de la cuvette et l'inclinaison de la paroi d'épaisseur. Chacune de ces étapes supplémentaires peut être introduite au cours du rognage, au cours de l'étirage éventuel ou encore aux premières étapes de la conificationIt is possible to introduce in several places of this production chain with multiple variants a complementary shaping, comprising three stages which do not necessarily follow in time and consisting of a perforation of the central hole of the already domed bottom, in a preforming of the bowl, and in a final shaping of the thick wall bordering the hole. During the preforming and final shaping steps, pairs of tools with complementary shapes, of the punch and die type are used so as to properly support and make repetitive the deformation of the bowl and the inclination of the wall. thick. Each of these additional stages can be introduced during the trimming, during the possible stretching or at the first stages of the conification
En fin d'étirage par exemple, le fond, sous l'effet du polnçoin, se trouve en appui sur un plot de bombage et prend une forme globale de bombé sphérique. Tout de suite après, encore maintenu entre poinçon et plot, il est perforé par un outil coulissant dans le plot de bombage. Arrivant sur le plateau tournant de la conifieuse, le fond est placé sur une matrice possédant, au- dessus du bombé sphérique conventionnel du plot de bombage, un appendice correspondant en relief à la cuvette à réaliser, mais avec une paroi sommitale horizontale. La compression de la partie centrale du fond entre poinçon et matrice donne une première forme d'ébauche de cuvette, possédant un fond horizontal. Le poinçon et la matrice étant maintenus rapprochés pour bloquer la paroi sphérique du fond et le bord externe de la cuvette, un doigt mobile coulissant dans l'axe de la matrice, de diamètre supérieur au diamètre du trou de perforation, effectue un mouvement axial vers le haut et retourne légèrement le bord interne de la cuvette tout en calibrant le diamètre de l'orifice perforé.At the end of drawing, for example, the bottom, under the effect of the polnçoin, is supported on a bending pad and takes an overall shape of a spherical bulge. Immediately afterwards, still held between the punch and the pad, it is perforated by a sliding tool in the bending pad. Arriving on the coniferous turntable, the base is placed on a matrix having, above the conventional spherical bulge of the bending block, an appendage corresponding in relief to the bowl to be produced, but with a horizontal top wall. The compression of the central part of the bottom between punch and die gives a first form of bowl blank, having a horizontal bottom. The punch and the die being held close together to block the spherical wall of the bottom and the external edge of the bowl, a movable finger sliding in the axis of the die, of diameter greater than the diameter of the perforation hole, performs an axial movement towards the top and slightly turns the internal edge of the bowl while calibrating the diameter of the perforated hole.
Le choix du diamètre de perforation dépend de l'épaisseur du fond et de l'inclinaison recherchée pour la paroi d'épaisseur bordant le trou: pour un joint Nicholson standard, elle est de préférence voisine de 45°. Il va de soi qu'elle pourrait être adaptée à toute autre forme de joint de type Nicholson, c'est-à- dire toute géométrie de joint possédant deux gorges annulaires et au moins une rainure longitudinale permettant le remplissage du gaz propulseur dans une première position d'enfoncement puis le stockage hermétique dudit gaz propulseur dans une deuxième position d'enfoncement. Ce qui compte, c'est que l'inclinaison de la paroi est telle que, même si le fond a une épaisseur plus importante, l'angle inférieur de la paroi d'extrémité continue à se loger facilement au fond de la gorge annulaire inférieure en imposant un serrage voisin de 1 mm. Une telle géométrie de paroi du fond est donc bien adaptée à la mise en place d'un embout de type Nicholson, quelle que soit l'épaisseur du fond et, évidemment, quelle que soit le matériau constitutif du fond.The choice of the perforation diameter depends on the thickness of the bottom and the inclination sought for the thickness wall bordering the hole: for a standard Nicholson joint, it is preferably close to 45 °. It goes without saying that it could be adapted to any other form of Nicholson type joint, that is to say any geometry of joint having two annular grooves and at least a longitudinal groove allowing the filling of the propellant gas in a first insertion position and then the hermetic storage of said propellant gas in a second insertion position. What matters is that the inclination of the wall is such that, even if the bottom has a greater thickness, the lower angle of the end wall continues to be easily accommodated at the bottom of the lower annular groove by imposing a tightening close to 1 mm. Such a bottom wall geometry is therefore well suited to the installation of a Nicholson type end piece, whatever the thickness of the bottom and, obviously, whatever the material of the bottom.
L'exemple donné ci-après dans le but de mieux faire comprendre l'invention décrit une géométrie particulière ne devant pas être considérée comme étant limitative.The example given below in order to better understand the invention describes a particular geometry which should not be considered as being limiting.
La figure 1 représente en haut une coupe par un plan diamétral de la partie centrale du fond de boîtier selon l'invention et en bas une coupe d'un embout Nicholson standard.Figure 1 shows at the top a section through a diametrical plane of the central part of the bottom of the housing according to the invention and below a section of a standard Nicholson tip.
La figure 2 représente en coupe par un plan diamétral l'embout à demi enfoncé dans le fond, dans la position qu'il occupe au moment de l'injection du gaz propulseur.Figure 2 shows in section through a diametrical plane the tip half pressed into the bottom, in the position it occupies at the time of the injection of the propellant.
La figure 3 représente en coupe par un plan diamétral l'embout complètement enfoncé, scellant hermétiquement la partie basse du boîtier remplie du gaz propulseur. EXEMPLE (Figures 1, 2 et 3)Figure 3 shows in section through a diametrical plane the tip fully inserted, hermetically sealing the lower part of the housing filled with propellant. EXAMPLE (Figures 1, 2 and 3)
Sur la figure 1 , on peut voir l'embout Nicholson 10 peu avant son enfoncement dans le fond 1 , représenté ici seulement par sa partie centrale 2, perforée d'un orifice 3 au niveau l'axe. Il possède deux gorges annulaires 17 et 22 dont les diamètres de fond de gorge sont légèrement différents. Le fond de la gorge annulaire supérieure 17, proche de l'extrémité de l'embout, surmontée du bourrelet supérieur 16, a un rayon de ≈2,7 mm, plus faible que celui du fond de la gorge inférieure 22, proche de la base 27 de l'embout, surmontée du bourrelet 21, ce dernier étant égal à 3,05 mm environ. La paroi inférieure 19 de la gorge annulaire supérieure 17 est tronconique, inclinée à 60° environ. La gorge annulaire inférieure 22 a une hauteur de ≈ 0,7 mm. La base 27 de l'embout a un diamètre de 8,7 mm environ. Le bourrelet supérieur 16 a un diamètre de 6J mm environ et le bourrelet inférieur 21 a un diamètre de 6,6 mm.In Figure 1, we can see the Nicholson tip 10 shortly before its insertion into the bottom 1, shown here only by its central part 2, perforated with an orifice 3 at the axis. It has two annular grooves 17 and 22, the diameters of the bottom of the groove are slightly different. The bottom of the upper annular groove 17, close to the end of the end piece, surmounted by the upper bead 16, has a radius of ≈2.7 mm, smaller than that of the bottom of the lower groove 22, close to the base 27 of the nozzle, surmounted by the bead 21, the latter being equal to approximately 3.05 mm. The lower wall 19 of the upper annular groove 17 is frustoconical, inclined at about 60 °. The lower annular groove 22 has a height of ≈ 0.7 mm. The base 27 of the endpiece has a diameter of approximately 8.7 mm. The upper bead 16 has a diameter of approximately 6J mm and the lower bead 21 has a diameter of 6.6 mm.
La partie centrale 2 du fond perforé comporte les portions géométriques suivantes: d'abord une portion sphérique S, semblable à la portion sphérique conventionnelle des fonds de boîtier distributeurs en alliage d'aluminium, dont la concavité est orientée vers le bas, ensuite une succession de trois portions toriques A, B et C . La portion torique A, présentant une concavité vers le haut, a une section en forme de secteur circulaire d'épaisseur 0,5 mm dont le centre est à 6,705 mm de l'axe et dont le rayon extérieur RA est égal à 2 mm. La portion torique B, présentant une concavité vers le bas, a une section en forme de secteur circulaire d'épaisseur 0,5 mm dont le centre est à 3,93 mm de l'axe et dont le rayon intérieur RB est égal à 1 mm. La portion torique C, présentant une concavité vers le haut, a une section en forme de secteur circulaire d'épaisseur 0,5 mm dont le centre est à 3,725 mm de l'axe et dont le rayon extérieur RC est égal à 1 ,3 mm. Lα tangente au point d'inflexion L, point frontière entre les portions S et A fait un angle de 14° avec l'horizontale. La tangente au point d'inflexion M, point frontière entre les portions A et B fait un angle de 66° avec l'axe. La tangente au point d'inflexion N, point frontière entre les portions B et C est descendante et fait un angle de 4° avec l'horizontale. La paroi d'épaisseur 4 est inclinée de 46° par rapport à l'horizontale et son angle inférieur 5 calibre l'orifice au diamètre 5J mm.The central part 2 of the perforated bottom has the following geometric portions: first a spherical portion S, similar to the conventional spherical portion of the distributor housing bottoms made of aluminum alloy, the concavity of which is oriented downwards, then a succession of three toric portions A, B and C. The toric portion A, having an upward concavity, has a section in the shape of a circular sector with a thickness of 0.5 mm, the center of which is 6.705 mm from the axis and the outside radius RA of which is equal to 2 mm. The toric portion B, having a downward concavity, has a section in the shape of a circular sector with a thickness of 0.5 mm, the center of which is 3.93 mm from the axis and whose internal radius RB is equal to 1 mm. The toric portion C, having an upward concavity, has a section in the shape of a circular sector with a thickness of 0.5 mm, the center of which is 3.725 mm from the axis and the outside radius RC of which is equal to 1, 3 mm. Lα tangent to the inflection point L, border point between the portions S and A makes an angle of 14 ° with the horizontal. The tangent to the inflection point M, the border point between the portions A and B makes an angle of 66 ° with the axis. The tangent to the inflection point N, the border point between the portions B and C is descending and makes an angle of 4 ° with the horizontal. The wall of thickness 4 is inclined by 46 ° relative to the horizontal and its lower angle 5 calibrates the orifice with the diameter 5J mm.
Sur la figure 2, l'embout Nicholson 10 est montré à moitié enfoncé dans la cuvette 12. Il est retenu avec un léger serrage (0,3mm) de l'angle inférieur 5 de la paroi d'épaisseur 4 sur le fond de la gorge annulaire supérieure 17. La paroi inférieure 19 de la gorge annulaire supérieure 17, inclinée à 60° environ, permet de maintenir le contact sur une assez grande distance avec la partie torique C du fond. On voit bien que l'épaisseur du fond n'a aucune influence sur la qualité du contact, à partir du moment où le fond métallique est nettement plus rigide que l'embout en élastomère.In FIG. 2, the Nicholson nozzle 10 is shown half pressed into the bowl 12. It is retained with a slight tightening (0.3mm) of the lower angle 5 of the wall of thickness 4 on the bottom of the upper annular groove 17. The lower wall 19 of the upper annular groove 17, inclined at approximately 60 °, makes it possible to maintain contact over a fairly large distance with the toric part C of the bottom. It is clear that the thickness of the bottom has no influence on the quality of the contact, from the moment when the metallic bottom is clearly more rigid than the elastomer end piece.
Sur la figure 3, l'embout Nicholson 10 est montré complètement enfoncé dans la cuvette 12. Il est retenu avec un serrage de près de 1 mm de l'angle inférieur 5 de la paroi d'épaisseur 4 sur le fond de la gorge annulaire inférieure 17. Au voisinage de la zone de serrage, l'embout est faiblement déformé. La paroi d'épaisseur a une inclinaison faible, de telle sorte que le serrage ne s'effectue qu'au niveau de l'angle inférieur. La paroi extérieure du fond au niveau du point d'inflexion N, point frontière entre les parties toriques B et C, est presque horizontale, ce qui permet de ne pas trop déformer la base 27 de l'embout Nicholson 10. Ici aussi, on voit bien que l'épaisseur du fond n'a aucune influence sur la qualité du contact, à partir du moment où le fond métallique est nettement plus rigide que l'embout en élastomère. Pour réaliser le fond de l'exemple, on a préformé la cuvette de telle sorte qu'elle garde un fond horizontal puis on a perforé un trou de diamètre 4,5 mm. Au cours de la mise en forme finale de la cuvette, la partie sphérique S, la partie torique A et une grande partie de la portion sphérique B sont maintenues encastrées entre matrice et poinçon et un doigt axial de 5J mm de diamètre remonte en retournant le fond initialement horizontal de la cuvette qui vient se plaquer contre une partie localement convexe de la paroi globalement concave du poinçoin en réalisant ainsi la portion torique C.In FIG. 3, the Nicholson end piece 10 is shown fully inserted into the bowl 12. It is retained with a tightening of almost 1 mm from the lower angle 5 of the thickness wall 4 on the bottom of the annular groove lower 17. In the vicinity of the clamping zone, the end piece is slightly deformed. The thick wall has a slight inclination, so that the tightening is carried out only at the level of the lower angle. The outer wall of the bottom at the point of inflection N, border point between the toric parts B and C, is almost horizontal, which makes it possible not to deform the base 27 of the Nicholson tip 10 too much. Here too, we clearly sees that the thickness of the bottom has no influence on the quality of the contact, from the moment when the metallic bottom is clearly more rigid than the elastomer end piece. To make the bottom of the example, we preformed the bowl so that it keeps a horizontal bottom and then we drilled a 4.5 mm diameter hole. During the final shaping of the bowl, the spherical part S, the toric part A and a large part of the spherical part B are kept embedded between die and punch and an axial finger of 5J mm in diameter rises by turning the initially horizontal bottom of the bowl which is pressed against a locally convex part of the generally concave wall of the punch thereby achieving the toric portion C.
Si l'épaisseur du fond est indifférente en ce qui concerne le maintien de l'embout Nicholson et l'étanchéité de sa fermeture, elle n'est pas indifférente vis-à-vis des conditions de mise en forme et de la détermination du diamètre de perforation initial.If the thickness of the bottom is indifferent with regard to the maintenance of the Nicholson tip and the tightness of its closure, it is not indifferent with respect to the shaping conditions and the determination of the diameter initial perforation.
AVANTAGES DU PROCEDE SELON L'INVENTIONADVANTAGES OF THE PROCESS ACCORDING TO THE INVENTION
Possibilité d'utiliser des fonds de boîtier en alliage d'aluminium d'épaisseurs différentes avec un embout standard déjà largement diffusé pour équiper les boîtiers distributeurs sous pression en acier. Possibility of using aluminum alloy case bottoms of different thicknesses with a standard tip already widely distributed to equip pressure distributor boxes in steel.

Claims

REVENDICATIONS
1. Boîtier en alliage d'aluminium distribuant sous pression des produits liquides à pâteux possédant une paroi cylindrique et un* fond (1 ) formant une seule 5 pièce avec ladite paroi cylindrique, la partie centrale (2) étant perforée d'un orifice (3) caractérisé en ce que ladite partie centrale (2) du fond (1 ) comprend les portions suivantes, décrites en partant de l'extérieur et en se dirigeant vers l'axe: une portion sphérique (S), dont la concavité est orientée vers le bas, et, successivement, trois portions toriques (A), (B) et (C) w présentant alternativement une concavité vers le haut (A), vers le bas (B), la dernière portion (C) présentant une concavité vers le haut, les portions se raccordant entre elles tangentiellement, le point de raccord (L, M, N) entre chaque couple de portions adjacentes (S,A; A,B; B,C) étant un point d'inflexion, et en ce que la dernière portion torique (C) présente une paroi1. Housing aluminum alloy distributing pressurized liquid to pasty products having a cylindrical wall and a bottom * (1) forming a single piece 5 with said cylindrical wall, the central portion (2) being perforated with an orifice ( 3) characterized in that said central part (2) of the bottom (1) comprises the following portions, described starting from the outside and moving towards the axis: a spherical portion (S), whose concavity is oriented down, and, successively, three toric portions (A), (B) and (C) w having alternately an upward concavity (A), downward (B), the last portion (C) having a concavity upwards, the portions connecting tangentially to each other, the connection point (L, M, N) between each pair of adjacent portions (S, A; A, B; B, C) being an inflection point, and in that the last toric portion (C) has a wall
15 d'épaisseur (4) non horizontale dont l'angle inférieur (5) délimite ledit orifice (3).15 of thickness (4) non-horizontal whose lower angle (5) delimits said orifice (3).
2. Boîtier en alliage d'aluminium selon la revendication 1 , caractérisé en ce que la tangente au point d'inflexion (N), frontière entre les portions torique (B) et 0 (C), est inclinée de moins de 10° par rapport à l'horizontale.2. Aluminum alloy casing according to claim 1, characterized in that the tangent to the point of inflection (N), border between the toric portions (B) and 0 (C), is inclined by less than 10 ° by compared to the horizontal.
3. Boîtier en alliage d'aluminium selon la revendication 1 ou 2, caractérisé en ce que la paroi d'épaisseur est inclinée d'un angle compris entre 30 et 60° par rapport à l'horizontale. 53. Aluminum alloy housing according to claim 1 or 2, characterized in that the thickness wall is inclined at an angle between 30 and 60 ° relative to the horizontal. 5
4. Boîtier en alliage d'aluminium selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le diamètre de son orifice (3) est inférieur de près de 1 mm par rapport au diamètre du fond de la gorge annulaire inférieure (22) d'un embout de type Nicholson (10). 0 4. Aluminum alloy housing according to any one of claims 1 to 3, characterized in that the diameter of its orifice (3) is less than almost 1 mm relative to the diameter of the bottom of the lower annular groove ( 22) a Nicholson-type nozzle (10). 0
5. Boîtier en alliage d'aluminium selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il est muni d'un embout de type Nicholson (10) enfoncé à moitié ou complètement dans l'orifice (3) du fond (1 ) dudit boîtier.5. Aluminum alloy housing according to any one of claims 1 to 4, characterized in that it is provided with a Nicholson type end piece (10) pressed half or completely into the orifice (3) of the bottom (1) of said housing.
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6. Utilisation d'un bouchon sur un boîtier en alliage d'aluminium distribuant sous pression des produits liquides à pâteux, caractérisée en ce que ledit bouchon est un embout de type Nicholson (10).6. Use of a plug on an aluminum alloy casing distributing liquid to pasty products under pressure, characterized in that said plug is a Nicholson type nozzle (10).
w 7. Procédé de fabrication du boîtier en alliage d'aluminium selon l'une quelconque des revendications 1 à 5, comprenant une première phase de filage par choc d'un pion cylindrique, une phase optionnelle d'étirage, un rognage de l'extrémité ouverte de la paroi cylindrique, et une phase de conification, au cours de laquelle, par tamponnage en plusieurs passes, le 5 fond (1 ) est réalisé, l'extrémité rognée de la paroi cylindrique est conifiee puis le bord extrême est roulé, caractérisé en ce qu'on introduit trois étapes supplémentaires où la partie centrale (2) du fond (1 ) est perforée, mise en forme de cuvette, et calibrée.w 7. A method of manufacturing the aluminum alloy housing according to any one of claims 1 to 5, comprising a first phase of impact spinning of a cylindrical pin, an optional phase of stretching, a trimming of the open end of the cylindrical wall, and a conification phase, during which, by buffering in several passes, the bottom (1) is produced, the trimmed end of the cylindrical wall is conified then the end edge is rolled, characterized in that three additional stages are introduced where the central part (2) of the bottom (1) is perforated, shaped into a bowl, and calibrated.
0 8. Procédé de fabrication d'un boîtier en alliage d'aluminium selon la revendication 7, caractérisé en ce que lesdites étapes supplémentaires sont introduites au cours d'une ou plusieurs des phases suivantes: étirage, rognage et conification.0 8. A method of manufacturing an aluminum alloy casing according to claim 7, characterized in that said additional steps are introduced during one or more of the following phases: drawing, trimming and conification.
5 9. Procédé de fabrication d'un boîtier en alliage d'aluminium selon la revendication 7 ou 8, caractérisé en ce que la mise en forme finale de la cuvette est réalisée à l'aide de deux outils de formes complémentaires qui maintiennent la portion sphérique (S), la portion torique (A) et une grande partie de la portion torique (B) encastrées tandis qu'un doigt axial coulissant 0 dans la matrice remonte en retournant le fond initialement horizontal de la cuvette qui vient se plaquer contre une partie localement convexe de la paroi globalement concave du poinçon, ce qui met en forme la portion torique (C), ledit doigt passant également au travers de l'orifice (3) en le calibrant.5 9. A method of manufacturing an aluminum alloy case according to claim 7 or 8, characterized in that the final shaping of the bowl is carried out using two tools of complementary shapes which hold the portion spherical (S), the toric portion (A) and a large part of the toric portion (B) embedded while an axial finger sliding 0 in the matrix rises by turning the initially horizontal bottom of the bowl which comes to be pressed against a locally convex part of the generally concave wall of the punch, which shapes the toric portion (C), said finger also passing through the orifice (3) by calibrating it.
10. Boîtier distribuant sous pression des produits liquides à pâteux possédant une paroi cylindrique et un fond (1 ) d'épaisseur supérieure à 0,5 mm, la partie centrale (2) dudit fond étant perforée d'un orifice (3) caractérisé en ce que ladite partie centrale (2) du fond (1) comprend les portions suivantes, décrites en partant de l'extérieur et en se dirigeant vers l'axe: une portion sphérique (S), dont la concavité est orientée vers le bas, et, successivement, trois portions toriques (A), (B) et (C) présentant alternativement une concavité vers le haut (A), vers le bas (B), la dernière portion (C) présentant une concavité vers le haut, les portions se raccordant entre elles tangentiellement, le point de raccord (L, M, N) entre chaque couple de portions adjacentes (S,A; A,B; B,C) étant un point d'inflexion, et en ce que la dernière portion torique (C) présente une paroi d'épaisseur (4) non horizontale dont l'angle inférieur (5) délimite ledit orifice (3). 10. Housing distributing under pressure liquid to pasty products having a cylindrical wall and a bottom (1) of thickness greater than 0.5 mm, the central part (2) of said bottom being perforated with an orifice (3) characterized in that said central portion (2) of the bottom (1) comprises the following portions, described starting from the outside and moving towards the axis: a spherical portion (S), the concavity of which is oriented downwards, and, successively, three toric portions (A), (B) and (C) alternately having an upward concavity (A), downward (B), the last portion (C) having an upward concavity, the portions tangentially joining together, the connection point (L, M, N) between each pair of adjacent portions (S, A; A, B; B, C) being an inflection point, and in that the last O-ring portion (C) has a non-horizontal thickness wall (4) whose lower angle (5) delimits said orifice (3).
PCT/FR2000/000297 1999-02-11 2000-02-09 Pressurised dispenser container base with two aluminium alloy chambers WO2000047492A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60003889T DE60003889T2 (en) 1999-02-11 2000-02-09 FLOOR FOR TWO-CHAMBER AEROSOL CONTAINERS MADE OF ALUMINUM ALLOY
EP00903753A EP1150906B1 (en) 1999-02-11 2000-02-09 Pressurised dispenser container base with two aluminium alloy chambers
AU25540/00A AU2554000A (en) 1999-02-11 2000-02-09 Pressurised dispenser container base with two aluminium alloy chambers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR99/01808 1999-02-11
FR9901808A FR2789662B1 (en) 1999-02-11 1999-02-11 TWO-CHAMBER ALUMINUM ALLOY PRESSURE DISTRIBUTOR HOUSING

Publications (1)

Publication Number Publication Date
WO2000047492A1 true WO2000047492A1 (en) 2000-08-17

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PCT/FR2000/000297 WO2000047492A1 (en) 1999-02-11 2000-02-09 Pressurised dispenser container base with two aluminium alloy chambers

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EP (1) EP1150906B1 (en)
AU (1) AU2554000A (en)
CZ (1) CZ20012881A3 (en)
DE (1) DE60003889T2 (en)
ES (1) ES2202052T3 (en)
FR (1) FR2789662B1 (en)
WO (1) WO2000047492A1 (en)

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WO2017184916A1 (en) * 2016-04-21 2017-10-26 Crown Packaging Technology, Inc. Beverage can having a grommet

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FR2862307B1 (en) * 2003-11-13 2006-04-28 Commissariat Energie Atomique POLYETHYNYLENE PHENYLENE ETHYNYLENE SILYLENE MODIFIED POLYMERS), COMPOSITIONS CONTAINING SAME, PROCESSES FOR PREPARING THE SAME, AND CURED PRODUCTS.
FR3084065B1 (en) 2018-07-18 2021-10-01 Lindal France CASE FOR PRESSURE CONTAINER
CN109188649B (en) * 2018-09-19 2021-07-02 珠海达理宇航科技有限公司 Protective device for polygonal barrel and space telescope lens

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US3522900A (en) 1967-10-18 1970-08-04 Continental Can Co Valve for product dispensing container
DE2010650A1 (en) * 1969-06-16 1971-01-07 Continental Can Company Ine , New York, NY (V St A ) Valve
FR2141282A5 (en) 1971-06-09 1973-01-19 Sterigard Corp Pressurised spray can - with non return valve for filling expanding agent into separate compartment
EP0227049A2 (en) * 1985-12-24 1987-07-01 S.C. Johnson & Son, Inc. Single stage aerosol pressurization grommet

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US3522900A (en) 1967-10-18 1970-08-04 Continental Can Co Valve for product dispensing container
DE2010650A1 (en) * 1969-06-16 1971-01-07 Continental Can Company Ine , New York, NY (V St A ) Valve
FR2141282A5 (en) 1971-06-09 1973-01-19 Sterigard Corp Pressurised spray can - with non return valve for filling expanding agent into separate compartment
EP0227049A2 (en) * 1985-12-24 1987-07-01 S.C. Johnson & Son, Inc. Single stage aerosol pressurization grommet

Cited By (6)

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Publication number Priority date Publication date Assignee Title
WO2017184916A1 (en) * 2016-04-21 2017-10-26 Crown Packaging Technology, Inc. Beverage can having a grommet
CN109070181A (en) * 2016-04-21 2018-12-21 皇冠包装技术公司 Beverage can with grommet
US10246250B2 (en) 2016-04-21 2019-04-02 Crown Packaging Technology, Inc. Beverage can having a grommet
US10865036B2 (en) 2016-04-21 2020-12-15 Crown Packaging Technology, Inc. Beverage can having a grommet
CN109070181B (en) * 2016-04-21 2021-09-07 皇冠包装技术公司 Beverage can with grommet
AU2017252313B2 (en) * 2016-04-21 2022-06-16 Crown Packaging Technology, Inc. Beverage can having a grommet

Also Published As

Publication number Publication date
EP1150906B1 (en) 2003-07-16
CZ20012881A3 (en) 2002-08-14
DE60003889D1 (en) 2003-08-21
AU2554000A (en) 2000-08-29
FR2789662B1 (en) 2001-03-16
DE60003889T2 (en) 2004-06-03
ES2202052T3 (en) 2004-04-01
FR2789662A1 (en) 2000-08-18
EP1150906A1 (en) 2001-11-07

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