EP0964820B1 - Double-walled tube with outer metal shell and inner plastic sheath - Google Patents
Double-walled tube with outer metal shell and inner plastic sheath Download PDFInfo
- Publication number
- EP0964820B1 EP0964820B1 EP98913828A EP98913828A EP0964820B1 EP 0964820 B1 EP0964820 B1 EP 0964820B1 EP 98913828 A EP98913828 A EP 98913828A EP 98913828 A EP98913828 A EP 98913828A EP 0964820 B1 EP0964820 B1 EP 0964820B1
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- EP
- European Patent Office
- Prior art keywords
- neck
- skirt
- double
- nozzle
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D47/00—Closures with filling and discharging, or with discharging, devices
- B65D47/04—Closures with discharging devices other than pumps
- B65D47/06—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages
- B65D47/12—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages having removable closures
- B65D47/122—Threaded caps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D35/00—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor
- B65D35/02—Body construction
- B65D35/12—Connections between body and closure-receiving bush
Definitions
- the invention relates to a double-walled tube formed of an envelope external metal and a flexible and protective internal envelope, intended for store and distribute detergents, hygiene products or particularly aggressive cosmetic products with regard to the envelope external metallic, such as hair dyes.
- Metal tubes are appreciated for their high restitution rates.
- the perfect plasticity of the metal prevents any return of the towards the inside of the tube when the user has finished pressing on the skirt of the tube.
- the metal envelope is very sensitive to corrosion from when it comes to containing particularly acidic or alkaline products.
- Patent application FR-A-2 322 058 presents a double-walled tube made up of two tubes produced separately and joined by their necks.
- the metal tube constitutes an external envelope which is protected from the aggressive product by a internal plastic tube.
- the top end of the neck of the tube internal plastic largely exceeds the top end of the neck of the tube external metal.
- the protruding part is flared in the shape of a trumpet opening above the metal neck, then embedded in one end plastic overmolded above and around the metal neck.
- the realization of such a tube therefore requires at least three separate operations: threading the inner tube in the outer tube, the flaring of the projecting end of the neck of the inner tube and then the delicate overmolding of a material crown plastic on the edge of the metallic external neck.
- Patent application JP-A-7277349 describes a double-walled tube made up also of two tubes produced separately but linked together at the level of their necks by means of a mouthpiece which is forcibly threaded around all.
- the preamble of claim 1 is based on this state of the art.
- FR-A-2 322 058 the top end of the neck of the tube internal largely exceeds the top end of the neck of the metal tube external.
- the protruding part is flared then folded outwards in covering the external metal neck.
- the end cap is pushed in and rests on the outside of the folded part of the inner tube.
- JP-A-7277349 recommends that the internal tube, which is in plastic material, has at least at its ends a smooth wall, free of mold seal line. Such a smooth wall is obtained by molding by injection the inner tube.
- the end of the neck of the inner plastic tube should be fairly thin, which gives it a poor buckling resistance and does not facilitate the first step of setting form which consists in flaring the end of this neck.
- This step necessary, is complicated by the need to design a tool that maintains this neck perfectly during the flare.
- the tubes large capacity, having a skirt length greater than 130 injection molding does not allow for easy thin neck of plastic material resistant to cracking under constraint. Indeed, these tubes require the use of materials capable of injection over a great length into a narrow air gap. Such materials must have a high melt index, greater than 15, and are much more sensitive to stress cracking in contact with the contained product that usually used materials, with a lower melt index (0.2 to 2).
- the internal plastic envelope by other more economical means, for example blow molding or molding of a head on an extruded or laminated welded skirt. It would take this will get rid of the obligation to have an exterior wall free of defects geometric, such as a mold joint line, or even get rid of the need to have a reproducible neck geometry, these conditions being necessary in JP-A-7277349 to obtain a perfect seal of the connection between the bottlenecks.
- the Applicant therefore sought to economically produce a tube to double wall with a flexible and protective inner shell and a external metallic envelope, intended to store and distribute products aggressive towards the metal envelope, the two envelopes being linked between them by their ends, the connection at the level of the necks having a improved tightness, especially for very long tubes.
- the object of the invention is a double wall tube intended to store and distribute products aggressive, with a inner tube having a skirt, a shoulder and a neck internal delimiting an internal orifice, and an external tube metallic having a skirt, a shoulder and a neck external, the two tubes being connected together at their necks by an end piece comprising a bottom and at least one external skirt characterized in that the end piece is also provided with an internal skirt so that, when the endpiece is forced in, the internal and external necks are buried between said internal and external skirt, the external wall of said internal skirt having a generally frustoconical profile and imposing an expansion circumferential to the middle parts of the necks and a flare of the ends of said necks.
- the part of the internal skirt of the nozzle which is introduced into the internal neck has, over a length at least equal to 2 millimeters, a outer diameter greater than the initial diameter of the internal orifice.
- the internal tube can be made of any flexible material capable of protecting the metallic outer shell of the corrosive packaged product.
- an internal plastic tube It is obtained by any means known: injection molding, blow molding, head molding then welding thereof on a welded extruded or laminated skirt.
- His neck is devoid of intaglio or raised details but may include seal lines of mold. It is thick enough to avoid any risk of buckling at during the insertion of the nozzle on the necks.
- the geometry of this neck cylindrical hollow should preferably check a height to thickness ratio less than 10, so as to avoid an "accordion" deformation of said neck.
- the outer tube is metallic. It has a skirt, a shoulder and a neck. Before the tip is inserted, the internal tube is threaded into the external tube.
- the outside diameter of the internal neck being substantially equal or very slightly smaller than the inside diameter of the external neck, the two necks are find very close to each other on a certain common height by their outer and inner walls respectively.
- the internal bottleneck does not or very little beyond the external neck: it is not essential to fold it back over the end of the external neck.
- the tip has an external appearance similar to the tips of the prior art, it can have an external skirt fitted on its external wall with means of secured with a plug, for example a thread. It is maintained firmly straddling the external neck thanks to fixing means such as latching beads located respectively on the wall external of the external neck and on the internal wall of the external skirt of the mouthpiece.
- fixing means such as latching beads located respectively on the wall external of the external neck and on the internal wall of the external skirt of the mouthpiece.
- anti-rotation means also in the form of longitudinal fins with sections complementary for example, located on the outer wall of the external neck.
- the endpiece is precentred, the precentring being facilitated by the presence of the internal skirt, and the fins are tapered in their upper ends with respect to the fins of the external neck and in their lower ends with respect to the fins of the outer skirt of the mouthpiece.
- the bottom of the end piece is at a distance from the latching bead, located on the inner wall of the outer skirt of the end piece, such that, at the end of insertion the end cap, the inner wall of this bottom does not crush the ends flared from the bottlenecks.
- the bottom of the end piece does not bear on any slices of bottlenecks.
- the inner skirt of the end cap was forced into the hole internal, the external diameter of the orthogonal sections of said internal skirt being, on a part in contact with the internal neck and of length at least equal to 2 millimeters, greater than the initial diameter of the internal orifice, i.e. the diameter of the internal orifice before the tip is inserted.
- This minimum length must be respected whatever the outside diameter of the neck envisaged, practically understood between 4 and 25 millimeters.
- the profile of the external wall of the internal skirt is generally frustoconical, the open end of the skirt being oriented towards the apex of the cone, so that, during its forced insertion inside the internal orifice, the internal skirt imposes plastic deformation, resulting in a flare, the ends of the two necks.
- the internal skirt of the nozzle therefore plays a double role: it is first, during the insertion by force of the nozzle, a tool which imposes a circumferential expansion on the middle parts of the necks, the internal neck, in direct contact with the skirt, being more stressed, and which then requires flaring of the ends of the necks. It is finally a effective sealing skirt throughout the use of the tube.
- the internal neck in direct contact with the internal skirt of the nozzle, undergoes a circumferential expansion deformation and its outer wall is flattened against the inner wall of the external neck by transmitting radial forces oriented towards the outside, which ensures contact between these two walls all the more intimate as the external neck is less likely to deform, that is to say more rigid and harder, than the internal neck.
- the internal skirt of the end piece is preferably thicker near its fasteners.
- a preferred embodiment of the invention consists in giving the internal skirt of the endpiece a cylindrical inner wall and an axisymmetric outer wall, of shape cylindro-bitronconic, the middle part being cylindrical, the other two truncated.
- the end of the metallic external neck is deformed so that it comes to bear on the inner wall of the mouthpiece.
- the contact between the two deformed neck ends is thus maintained between the bottom of the internal skirt and that of the external skirt of the mouthpiece.
- the bottom of the latter is thick and its wall inside is smooth, with a diameter substantially equal to the outside diameter of the external neck increased by a value less than the difference between the diameter of the cylindrical part of the internal skirt of the nozzle and the initial diameter of the internal orifice.
- the internal neck is quite thick, which reduces the influence of a possible local excess thickness of the external wall of the internal neck on the quality of tightening and sealing.
- the tip according to the invention has the advantage of locating the tight contact on the first diameter encountered by the product. There's no risk of product retention in more or less peripheral areas stressed during the use of the tube. On the other hand, intimate contact is located on the smallest diameter, which allows a more intense tightening and more efficient for a given diameter difference.
- the tip is made of a harder and more rigid material than the material of the inner tube, which is also less hard and less rigid than that of the outer tube.
- PP polypropylene
- PE.BD low density polyethylene
- the inner skirt of the nozzle must be thin enough to leave an opening suitable for product delivery rate and thick enough to impose the deformations sought at the two necks, while resisting mechanically to the forces which were generated during the sinking by dint of the tip and which persist, while relaxing, throughout the use of the tube.
- the skirt is preferably in continuity of material with the end piece, for example molded in rigid plastic material, such as polypropylene.
- the outer aluminum tube is fully annealed after shaping, which gives it flexibility in its thin areas.
- the inner tube is made of the most flexible and as hard as possible material, resistant to stress cracking in the presence of an aggressive medium such as than a hair dye. It is preferably made of a plastic material such than low density polyethylene.
- the applicant has tested different geometries in varying in particular the diameters and thicknesses of necks and skirts from the mouthpiece.
- the best sealing conditions were obtained with a internal neck approximately as thick as the cylindrical part of the internal end cap skirt.
- the external neck may be thinner than the two others, the metal being much more rigid.
- it can be further thinned to typically half the thickness of the neck internal so that it flares plastically without great resistance, which facilitates the flaring of the internal neck, the latter remaining thicker than in the middle part.
- the internal neck is thus "pinched" in its middle part between a flared end that is not or little thinned and a non-deformed base, its trapping helping to firmly maintain the inner tube inside the outer tube.
- the deformation imposed by the internal skirt of the nozzle corresponds to a tightening of 3 to 8%, preferably 4% to 6%, that is to say that the outside diameter of the cylindrical part of the internal skirt of the nozzle is greater, by approximately 5%, than the initial diameter of the internal orifice.
- a weaker tightening does not give satisfactory sealing conditions all throughout the life of the tube. Indeed, a certain loosening, more or weaker after initial tightening is observed after a few weeks at Room temperature.
- a greater tightening results, during the insertion of the end piece on the necks, or an accordion deformation of the neck of the inner tube, or, if the thickness of the inner neck is large, a insufficient penetration making assembly impossible.
- a second object of the invention relates to the nozzle itself comprising a bottom and an external skirt provided with latching and anti-rotation means, characterized in that it includes, also attached to its bottom, a skirt internal whose profile of the external wall is generally frustoconical, the open end of the skirt being oriented towards the apex of the cone.
- this internal skirt is thicker near its fastener on the bottom of the mouthpiece. It advantageously has a cylindrical inner wall and a wall external cylindro-bitronconic, the frustoconical and cylindrical parts having approximately the same height, the frustoconical parts making a half-angle at the summit between 5 and 20 °.
- This nozzle is preferably in one hard plastic material, such as polypropylene.
- Figure 1 shows the axial section of a double-walled tube head according to the invention surmounted by the end fitting before being forced into it internal and external bottlenecks.
- FIG. 2 represents the double-walled tube head according to the invention after forced insertion of the nozzle on the necks.
- the left side is a axial half-section through a diametral plane passing a longitudinal fin of the nozzle
- the right part is an axial half-section through a diametrical plane passing through a longitudinal fin of the external neck.
- the double-walled tube 1 comprises an internal tube 10 and an external tube 20 made of annealed aluminum.
- the internal tube 10 is obtained by overmolding a head 12 in PE.BD (low density polyethylene) on a skirt 13, also in polyethylene, with a diameter of 24.3 mm and a thickness of 250 microns.
- PE.BD low density polyethylene
- the internal neck 11 defines an internal orifice 14. Its top end is the edge 18.
- the external annealed aluminum tube 20 has a skirt 25 with an external diameter of 25 mm and a thickness of 120 microns. It has a shoulder 24 and a neck 21 , the top end of which is the edge 28.
- the external diameter of the internal neck 11 and the internal diameter of the external neck 21 are equal to 8.7 mm.
- the internal neck 11 has a thickness of 0.75 millimeters.
- the external neck 21, 0.5 mm thick, is provided, on its external wall, with a snap rim 23 situated at the base of the neck and longitudinal fins 22 which extend along said wall outside up to 1 mm from the end.
- the inner tube 10 is introduced into the outer aluminum tube by conventional means: a mandrel threads inside the inner tube and drives it inside the outer tube whose shoulder and head are immobilized by a tool which follows its external shape. At the end of threading, the edge 18 of the internal neck 11 exceeds the edge 28 of the external neck 21 by a few tenths of a millimeter.
- the external neck and the internal neck have a common contact height H of approximately 4.7 mm.
- the end piece 30 has an internal skirt 31, a bottom 34 and an external skirt 35 provided on its inner wall with fins 42 which are intended, in combination with the fins 22 of the external neck 20, to immobilize the end piece 30 in rotation. and, on its outer wall, with a thread 41, for the screwing of a capsule intended to plug the dispensing orifice 40.
- the cylindrical part 32 of the internal skirt 31 has a diameter of 7.5 mm, which imposes a tightening of 0.3 mm when the end piece 30 is pressed onto the necks 11 and 21. The effect of a certain creep is felt after a few days, causing permanent deformation of the two necks and a reduction in the Tightening. The latter nevertheless remains greater than 0.1 mm.
- the external skirt 35 of the end piece 30 has on the side of its attachment a thick part 36, the smooth internal wall of which has a diameter of 9.8 mm does not abut against the anti-rotation fins 22 of the external neck .
- the fins 42 are introduced into the intervals left by the fins 22 of the external neck 21, the cylindrical part 32 of the internal skirt 31 of the end piece 30 forces the necks to expand 0.3 mm then the frusto-conical part 33 close to the attachment to the bottom 34 of the nozzle 30 imposes a flaring at all of the ends of the necks 11 and 21.
- the external neck 21, with an external diameter of 9.7 mm flares by 0.1 mm and then comes to rest on this smooth part of the inner wall of the outer skirt 35 of the end piece 30.
- the outer skirt 35 of the end piece 30 is also provided towards its open end with a latching bead 37.
- the position of this latching bead 37 relative to the bottom 34 of the end piece 30 is chosen so that 'at the end of the snap-fastening, there is no support of the internal face 38 of the bottom 34 of the end piece 30 on the flared top ends of the necks 11 and 21. This position is also such that the start of the flaring occurs before the start of the latching, which reduces the efforts required to drive the endpiece.
- Fifty double-walled tubes produced using this method of the invention have undergone this test, which consists in injecting air inside the tubes until an overpressure of 500 g / cm2 is obtained. These tubes are then plugged then immersed in water for 30 seconds. No leaks were detected.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tubes (AREA)
- Closures For Containers (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
- Packages (AREA)
Description
L'invention concerne un tube à double paroi formé d'une enveloppe métallique externe et d'une enveloppe interne souple et protectrice, destiné à stocker et distribuer des produits détergents, des produits d'hygiène ou des produits cosmétiques particulièrement agressifs vis-à-vis de l'enveloppe métallique externe, tels que des teintures pour cheveux.The invention relates to a double-walled tube formed of an envelope external metal and a flexible and protective internal envelope, intended for store and distribute detergents, hygiene products or particularly aggressive cosmetic products with regard to the envelope external metallic, such as hair dyes.
Les tubes métalliques sont appréciés pour leurs taux de restitution élevés. D'autre part, la parfaite plasticité du métal permet d'éviter tout retour du produit vers l'intérieur du tube lorsque l'utilisateur a fini de presser sur la jupe du tube. En revanche, l'enveloppe métallique est très sensible à la corrosion dès lors qu'il s'agit de contenir des produits particulièrement acides ou alcalins.Metal tubes are appreciated for their high restitution rates. On the other hand, the perfect plasticity of the metal prevents any return of the towards the inside of the tube when the user has finished pressing on the skirt of the tube. On the other hand, the metal envelope is very sensitive to corrosion from when it comes to containing particularly acidic or alkaline products.
Des tentatives consistant à recouvrir d'un vernis la paroi intérieure de tubes métalliques n'ont pas donné de bons résultats: la couche déposée n'est jamais très régulière, elle tient plus ou moins bien à la paroi, elle est assez fragile et se craquelle lors des multiples manipulations du tube. Cette fragilité se traduit par une fissuration laissant passer le produit qui attaque et corrode finalement le métal. D'autre part, les extrémités du tube, c'est-à-dire le goulot et, à l'autre bout, l'extrémité ouverte par laquelle le tube est rempli et qui est ensuite aplatie puis repliée pour sceller le tube, ne sont pas protégées ou mal protégées par le vernis.Attempts to coat the inner wall of tubes with a varnish have not given good results: the deposited layer is never very regular, it holds more or less well on the wall, it is quite fragile and crackle during multiple manipulations of the tube. This fragility translates into cracking letting through the product which attacks and ultimately corrodes the metal. On the other hand, the ends of the tube, i.e. the neck and, at the other end, the open end with which the tube is filled and which is then flattened then folded over to seal the tube, are not protected or badly protected by the varnish.
La demande de brevet FR-A-2 322 058 présente un tube à double paroi constitué de deux tubes réalisés séparément et réunis par leurs goulots. Le tube métallique constitue une enveloppe externe qui est protégée du produit agressif par un tube interne en matière plastique. L'extrémité sommitale du goulot du tube plastique interne dépasse largement l'extrémité sommitale du goulot du tube métallique externe. La partie dépassante est évasée en forme de trompette s'ouvrant au-dessus du goulot métallique, puis noyée dans une extrémité plastique surmoulée au-dessus et autour du goulot métallique. La réalisation d'un tel tube nécessite donc au moins trois opérations séparées: l'enfilage du tube interne dans le tube externe, l'évasement de l'extrémité débordante du goulot du tube interne puis le surmoulage délicat d'une couronne en matière plastique sur la tranche du goulot externe métallique.Patent application FR-A-2 322 058 presents a double-walled tube made up of two tubes produced separately and joined by their necks. The metal tube constitutes an external envelope which is protected from the aggressive product by a internal plastic tube. The top end of the neck of the tube internal plastic largely exceeds the top end of the neck of the tube external metal. The protruding part is flared in the shape of a trumpet opening above the metal neck, then embedded in one end plastic overmolded above and around the metal neck. The realization of such a tube therefore requires at least three separate operations: threading the inner tube in the outer tube, the flaring of the projecting end of the neck of the inner tube and then the delicate overmolding of a material crown plastic on the edge of the metallic external neck.
La demande de brevet JP-A-7277349 décrit un tube à double paroi constitué également de deux tubes réalisés séparément mais liés entre eux au niveau de leurs goulots par l'intermédiaire d'un embout qui est enfilé à force autour de l'ensemble. Le préambule de la revendication 1 est basé sur cet état de la Technique. Comme pour FR-A-2 322 058, l'extrémité sommitale du goulot du tube interne dépasse largement l'extrémité sommitale du goulot du tube métallique externe. La partie dépassante est évasée puis pliée vers l'extérieur en recouvrant le goulot métallique externe. L'embout est enfilé à force et s'appuie sur l'extérieur de la partie repliée du tube interne. Pour assurer une bonne étanchéité à la liaison, JP-A-7277349 recommande que le tube interne, qui est en matière plastique, ait au moins en ses extrémités une paroi lisse, exempte de ligne de joint de moule. Une telle paroi lisse est obtenue en moulant par injection le tube interne.Patent application JP-A-7277349 describes a double-walled tube made up also of two tubes produced separately but linked together at the level of their necks by means of a mouthpiece which is forcibly threaded around all. The preamble of claim 1 is based on this state of the art. As for FR-A-2 322 058, the top end of the neck of the tube internal largely exceeds the top end of the neck of the metal tube external. The protruding part is flared then folded outwards in covering the external metal neck. The end cap is pushed in and rests on the outside of the folded part of the inner tube. To ensure good tightness at the connection, JP-A-7277349 recommends that the internal tube, which is in plastic material, has at least at its ends a smooth wall, free of mold seal line. Such a smooth wall is obtained by molding by injection the inner tube.
Pour pouvoir être facilement repliée par-dessus l'extrémité sommitale du goulot et venir recouvrir la paroi latérale extérieure du goulot métallique, l'extrémité du goulot du tube plastique interne doit être assez mince, ce qui lui confère une mauvaise tenue au flambage et ne facilite pas la première étape de mise en forme qui consiste à évaser l'extrémité de ce goulot. Cette étape, nécessaire, est compliquée par la nécessité de concevoir un outillage qui maintienne parfaitement ce goulot au cours de l'évasement. D'autre part, avec les tubes de grande capacité, devant avoir une longueur de jupe supérieure à 130 millimètres, le moulage par injection ne permet pas de réaliser facilement un goulot de faible épaisseur en une matière plastique résistant bien à la fissuration sous contrainte. En effet, ces tubes nécessitent l'emploi de matériaux aptes à l'injection sur une grande longueur dans un entrefer étroit. De tels matériaux doivent avoir un indice de fluidité élevé, supérieur à 15, et sont beaucoup plus sensibles à la fissuration sous contrainte au contact du produit contenu que les matériaux habituellement utilisés, à indice de fluidité plus faible (0,2 à 2).To be easily folded over the top end of the neck and cover the outer side wall of the metal neck, the end of the neck of the inner plastic tube should be fairly thin, which gives it a poor buckling resistance and does not facilitate the first step of setting form which consists in flaring the end of this neck. This step, necessary, is complicated by the need to design a tool that maintains this neck perfectly during the flare. On the other hand, with the tubes large capacity, having a skirt length greater than 130 injection molding does not allow for easy thin neck of plastic material resistant to cracking under constraint. Indeed, these tubes require the use of materials capable of injection over a great length into a narrow air gap. Such materials must have a high melt index, greater than 15, and are much more sensitive to stress cracking in contact with the contained product that usually used materials, with a lower melt index (0.2 to 2).
D'autre part, il serait souhaitable de fabriquer l'enveloppe interne plastique par d'autres moyens plus économiques, par exemple extrusion soufflage ou encore moulage d'une tête sur une jupe extrudée ou laminée soudée. Il faudrait pour cela s'affranchir de l'obligation d'avoir une paroi extérieure exempte de défaut géométrique, tel qu'une ligne de joint de moule, ou encore s'affranchir de la nécessité d'avoir une géométrie de goulot reproductible, ces conditions étant nécessaires dans JP-A-7277349 pour obtenir une parfaite étanchéité de la liaison entre les goulots.On the other hand, it would be desirable to manufacture the internal plastic envelope by other more economical means, for example blow molding or molding of a head on an extruded or laminated welded skirt. It would take this will get rid of the obligation to have an exterior wall free of defects geometric, such as a mold joint line, or even get rid of the need to have a reproducible neck geometry, these conditions being necessary in JP-A-7277349 to obtain a perfect seal of the connection between the bottlenecks.
La demanderesse a donc cherché à réaliser économiquement un tube à double paroi avec une enveloppe interne souple et protectrice et une enveloppe externe métallique, destiné à stocker et distribuer des produits agressifs vis-à-vis de l'enveloppe métallique, les deux enveloppes étant liées entre elles par leurs extrémités, la liaison au niveau des goulots ayant une étanchéité améliorée, notamment pour les tubes de grande longueur.The Applicant therefore sought to economically produce a tube to double wall with a flexible and protective inner shell and a external metallic envelope, intended to store and distribute products aggressive towards the metal envelope, the two envelopes being linked between them by their ends, the connection at the level of the necks having a improved tightness, especially for very long tubes.
L'objet de l'invention est un tube double paroi destiné à stocker et distribuer des produits agressifs, comportant un tube interne ayant une jupe, une épaule et un goulot interne délimitant un orifice interne, et un tube externe métallique ayant une jupe, une épaule et un goulot externe, les deux tubes étant reliés entre eux au niveau de leurs goulots par un embout comportant un fond et au moins une jupe externe caractérisé en ce que l'embout est également muni d'une jupe interne de telle sorte que, lorsque l'embout est enfoncé à force, les goulots interne et externe sont enterrés entre lesdites jupe interne et externe, la paroi extérieure de ladite jupe interne ayant un profil globalement tronconique et imposant une expansion circonférentielle aux parties médianes des goulots et un évasement des extrémités desdits goulots.The object of the invention is a double wall tube intended to store and distribute products aggressive, with a inner tube having a skirt, a shoulder and a neck internal delimiting an internal orifice, and an external tube metallic having a skirt, a shoulder and a neck external, the two tubes being connected together at their necks by an end piece comprising a bottom and at least one external skirt characterized in that the end piece is also provided with an internal skirt so that, when the endpiece is forced in, the internal and external necks are buried between said internal and external skirt, the external wall of said internal skirt having a generally frustoconical profile and imposing an expansion circumferential to the middle parts of the necks and a flare of the ends of said necks.
Lorsque l'embout est enfoncé à force, le fond de l'embout n'est pas en appui sur les tranches des goulots interne et externe, c'est-à-dire qu'il existe un jeu non nul, supérieur à quelques dixièmes de millimètre, entre le fond de l'embout et lesdites tranches. La partie de la jupe interne de l'embout qui est introduite dans le goulot interne a, sur une longueur au moins égale à 2 millimètres, un diamètre extérieur supérieur au diamètre initial de l'orifice interne.When the tip is forced into place, the bottom of the tip is not in contact on the edges of the internal and external bottlenecks, that is to say that there is no play zero, greater than a few tenths of a millimeter, between the bottom of the nozzle and said tranches. The part of the internal skirt of the nozzle which is introduced into the internal neck has, over a length at least equal to 2 millimeters, a outer diameter greater than the initial diameter of the internal orifice.
Le tube interne peut être en toute matière souple, susceptible de protéger l'enveloppe externe métallique du produit conditionné corrosif. De préférence, on choisira un tube interne en matière plastique. Il est obtenu par tout moyen connu: moulage par injection, extrusion soufflage, moulage de la tête puis soudage de celle-ci sur une jupe extrudée ou laminée soudée. Son goulot est démuni de détails en creux ou en relief mais peut comporter des lignes de joint de moule. Il est suffisamment épais pour éviter tout risque de flambage au cours de l'enfoncement de l'embout sur les goulots. La géométrie de ce goulot cylindrique creux doit vérifier de préférence un rapport hauteur sur épaisseur inférieur à 10, de façon à éviter une déformation "en accordéon" dudit goulot.The internal tube can be made of any flexible material capable of protecting the metallic outer shell of the corrosive packaged product. Preferably, we will choose an internal plastic tube. It is obtained by any means known: injection molding, blow molding, head molding then welding thereof on a welded extruded or laminated skirt. His neck is devoid of intaglio or raised details but may include seal lines of mold. It is thick enough to avoid any risk of buckling at during the insertion of the nozzle on the necks. The geometry of this neck cylindrical hollow should preferably check a height to thickness ratio less than 10, so as to avoid an "accordion" deformation of said neck.
Le tube externe est métallique. Il comporte une jupe, une épaule et un goulot. Avant enfoncement de l'embout, le tube interne est enfilé dans le tube externe. Le diamètre extérieur du goulot interne étant sensiblement égal ou très légèrement inférieur au diamètre intérieur du goulot externe, les deux goulots se trouvent très proches l'un de l'autre sur une certaine hauteur commune par leurs parois respectivement extérieure et intérieure. Le goulot interne ne dépasse pas ou très peu le goulot externe: il n'est pas indispensable de le replier par-dessus l'extrémité du goulot externe.The outer tube is metallic. It has a skirt, a shoulder and a neck. Before the tip is inserted, the internal tube is threaded into the external tube. The outside diameter of the internal neck being substantially equal or very slightly smaller than the inside diameter of the external neck, the two necks are find very close to each other on a certain common height by their outer and inner walls respectively. The internal bottleneck does not or very little beyond the external neck: it is not essential to fold it back over the end of the external neck.
L'embout a un aspect extérieur semblable aux embouts de l'art antérieur, il peut être muni d'une jupe externe équipée sur sa paroi extérieure de moyens de solidarisation avec un bouchon, par exemple un filetage. Il est maintenu fermement à cheval autour du goulot externe grâce à des moyens de fixation tels que des bourrelets d'encliquetage situés respectivement sur la paroi extérieure du goulot externe et sur la paroi intérieure de la jupe externe de l'embout. Lorsqu'on envisage de boucher le tube en vissant une capsule ou un bouchon sur la paroi extérieure de l'embout, la jupe externe est munie sur sa paroi extérieure d'un filetage et sur sa paroi intérieure, déjà munie d'un bourrelet d'encliquetage, de moyens anti-rotation, tels que des ailettes longitudinales. Au cours de l'enfoncement de l'embout, ces moyens sont introduits entre des moyens anti-rotation, également en forme d'ailettes longitudinales à sections complémentaires par exemple, situés sur la paroi extérieure du goulot externe. Pour faciliter cette introduction, l'embout est précentré, le précentrage étant facilité par la présence de la jupe interne, et les ailettes sont effilées en leurs extrémités supérieures en ce qui concerne les ailettes du goulot externe et en leurs extrémités inférieures en ce qui concerne les ailettes de la jupe externe de l'embout. Plusieurs formes et jeux d'ailettes facilitant l'autocentrage d'une pièce devant s'enfiler autour d'une autre ont déjà été proposés dans EP-A-0 119 145.The tip has an external appearance similar to the tips of the prior art, it can have an external skirt fitted on its external wall with means of secured with a plug, for example a thread. It is maintained firmly straddling the external neck thanks to fixing means such as latching beads located respectively on the wall external of the external neck and on the internal wall of the external skirt of the mouthpiece. When you plan to plug the tube by screwing on a cap or plug on the outer wall of the nozzle, the outer skirt is provided on its outer wall of a thread and on its inner wall, already provided with a bead latching, anti-rotation means, such as longitudinal fins. At during the insertion of the nozzle, these means are introduced between anti-rotation means, also in the form of longitudinal fins with sections complementary for example, located on the outer wall of the external neck. To facilitate this introduction, the endpiece is precentred, the precentring being facilitated by the presence of the internal skirt, and the fins are tapered in their upper ends with respect to the fins of the external neck and in their lower ends with respect to the fins of the outer skirt of the mouthpiece. Several shapes and sets of fins facilitate self-centering of a part to thread around another have already been proposed in EP-A-0 119 145.
Le fond de l'embout est à une distance du bourrelet d'encliquetage, situé sur la paroi intérieure de la jupe externe de l'embout, telle que, en fin d'enfoncement de l'embout, la paroi intérieure de ce fond ne vient pas écraser les extrémités évasées des goulots. Ainsi, le fond de l'embout ne vient en appui sur aucune des tranches des goulots. The bottom of the end piece is at a distance from the latching bead, located on the inner wall of the outer skirt of the end piece, such that, at the end of insertion the end cap, the inner wall of this bottom does not crush the ends flared from the bottlenecks. Thus, the bottom of the end piece does not bear on any slices of bottlenecks.
La jupe interne de l'embout a été enfoncée à force à l'intérieur de l'orifice interne, le diamètre extérieur des sections orthogonales de ladite jupe interne étant, sur une partie en contact avec le goulot interne et de longueur au moins égale à 2 millimètres, supérieur au diamètre initial de l'orifice interne, c'est-à-dire au diamètre de l'orifice interne avant enfoncement de l'embout. La demanderesse a constaté que cette longueur minimale devait être respectée quel que soit le diamètre extérieur du goulot envisagé, pratiquement compris entre 4 et 25 millimètres.The inner skirt of the end cap was forced into the hole internal, the external diameter of the orthogonal sections of said internal skirt being, on a part in contact with the internal neck and of length at least equal to 2 millimeters, greater than the initial diameter of the internal orifice, i.e. the diameter of the internal orifice before the tip is inserted. The Applicant has found that this minimum length must be respected whatever the outside diameter of the neck envisaged, practically understood between 4 and 25 millimeters.
L'absence d'appui sur les tranches des goulots, notamment celle du goulot interne, ainsi qu'une surface de frottement suffisamment longue permettent de maintenir le tube interne fermement fixé à l'intérieur du tube externe. Cette fixation est encore améliorée par un évasement des extrémités des goulots.The lack of support on the edges of the necks, especially that of the neck internal, as well as a sufficiently long friction surface allow keep the inner tube firmly fixed inside the outer tube. This fixing is further improved by flaring the ends of the necks.
Le profil de la paroi extérieure de la jupe interne est globalement tronconique, l'extrémité ouverte de la jupe étant orientée vers l'apex du cône, de telle sorte que, au cours de son enfoncement à force à l'intérieur de l'orifice interne, la jupe interne impose une déformation plastique, se traduisant par un évasement, des extrémités des deux goulots. La jupe interne de l'embout joue donc un double rôle: c'est d'abord, au cours de l'enfoncement à force de l'embout, un outil qui impose une expansion circonférentielle aux parties médianes des goulots, le goulot interne, en contact direct avec la jupe, étant plus sollicité, et qui impose ensuite un évasement des extrémités des goulots. C'est enfin une jupe d'étanchéité efficace tout au long de l'utilisation du tube.The profile of the external wall of the internal skirt is generally frustoconical, the open end of the skirt being oriented towards the apex of the cone, so that, during its forced insertion inside the internal orifice, the internal skirt imposes plastic deformation, resulting in a flare, the ends of the two necks. The internal skirt of the nozzle therefore plays a double role: it is first, during the insertion by force of the nozzle, a tool which imposes a circumferential expansion on the middle parts of the necks, the internal neck, in direct contact with the skirt, being more stressed, and which then requires flaring of the ends of the necks. It is finally a effective sealing skirt throughout the use of the tube.
Le goulot interne, en contact direct avec la jupe interne de l'embout, subit une déformation en expansion circonférentielle et sa paroi extérieure se plaque contre la paroi intérieure du goulot externe en transmettant des forces radiales orientées vers l'extérieur, ce qui assure un contact entre ces deux parois d'autant plus intime que le goulot externe est moins susceptible de se déformer, c'est-à-dire plus rigide et plus dur, que le goulot interne. Il s'ensuit une liaison parfaitement étanche, même si la paroi extérieure de la jupe interne n'est pas parfaitement lisse, par exemple en raison de la présence d'une ligne de joint de moule.The internal neck, in direct contact with the internal skirt of the nozzle, undergoes a circumferential expansion deformation and its outer wall is flattened against the inner wall of the external neck by transmitting radial forces oriented towards the outside, which ensures contact between these two walls all the more intimate as the external neck is less likely to deform, that is to say more rigid and harder, than the internal neck. There follows an affair perfectly waterproof, even if the outer wall of the internal skirt is not perfectly smooth, for example due to the presence of a joint line of mold.
Pour résister aux efforts imposés par cet enfoncement à force, la jupe interne de l'embout est de préférence plus épaisse à proximité de ses attaches. Une modalité préférée de l'invention consiste à donner à la jupe interne de l'embout une paroi intérieure cylindrique et une paroi extérieure axisymétrique, de forme cylindro-bitronconique, la partie médiane étant cylindrique, les deux autres tronconiques.To resist the forces imposed by this forced insertion, the internal skirt of the end piece is preferably thicker near its fasteners. A preferred embodiment of the invention consists in giving the internal skirt of the endpiece a cylindrical inner wall and an axisymmetric outer wall, of shape cylindro-bitronconic, the middle part being cylindrical, the other two truncated.
De préférence, la paroi extérieure de la jupe interne de l'embout comporte trois parties de dimensions sensiblement égales que l'on peut décrire en partant du fond par:
- une première partie tronconique de demi-angle au sommet compris entre 5 et 20°, l'apex se trouvant en direction de l'extrémité ouverte;
- une deuxième partie cylindrique à section circulaire de diamètre supérieur au diamètre initial de l'orifice interne, c'est-à-dire au diamètre de l'orifice délimité par le goulot interne avant enfoncement de l'embout;
- une troisième partie tronconique de demi-angle au sommet compris entre 5 et 20°, l'apex se trouvant en direction de l'extrémité ouverte.
- a first frustoconical part with a half-angle at the apex between 5 and 20 °, the apex being in the direction of the open end;
- a second cylindrical part with circular section of diameter greater than the initial diameter of the internal orifice, that is to say the diameter of the orifice delimited by the internal neck before insertion of the nozzle;
- a third frustoconical part with a half-angle at the apex between 5 and 20 °, the apex being in the direction of the open end.
Cette forme permet, lorsque l'embout est enfoncé à force sur les goulots, d'imposer à ces derniers une expansion différente suivant les parties concernées:
- une expansion circonférentielle forte près de l'attache de la jupe sur le fond de l'embout: les deux extrémités de goulots sont déformées plastiquement, c'est-à-dire qu'elles ont subi un évasement irréversible. L'angle de la paroi tronconique doit donc être suffisant (>5°) pour entraíner une déformation significative des deux goulots mais reste limité (<20°) pour éviter des efforts trop importants ou une déchirure. Avantageusement, l'extrémité du goulot externe subit une expansion limitée en venant buter contre la paroi intérieure de la jupe externe de l'embout, ce qui permet de conserver un contact hermétique entre les deux goulots, à leurs extrémités.
- une expansion circonférentielle assez forte au milieu de la jupe; les parties de goulot concernées, éloignées de leurs extrémités, ont moins de degré de liberté dans leur déformation. Le goulot interne, fortement comprimé entre la jupe interne de l'embout et le goulot externe tous deux plus rigides, s'amincit plus dans cette partie médiane qu'au niveau de son extrémité évasée. La partie du goulot interne concernée se trouve ainsi "étranglée", ce qui contribue, avec le frottement sur les parois, à retenir le tube interne à l'intérieur du tube externe.
- une expansion faible à nulle en extrémité de jupe; la partie tronconique de la paroi extérieure de la jupe interne de l'embout facilite le positionnement de ce dernier au dessus des goulots et permet d'éviter la déformation en accordéon du goulot interne.
- a strong circumferential expansion near the attachment of the skirt on the bottom of the end piece: the two ends of necks are plastically deformed, that is to say that they have undergone an irreversible flaring. The angle of the frustoconical wall must therefore be sufficient (> 5 °) to cause significant deformation of the two necks but remains limited (<20 °) to avoid excessive effort or tearing. Advantageously, the end of the external neck undergoes a limited expansion by abutting against the internal wall of the external skirt of the end piece, which makes it possible to maintain a hermetic contact between the two necks, at their ends.
- a fairly strong circumferential expansion in the middle of the skirt; the neck portions concerned, distant from their ends, have less degree of freedom in their deformation. The internal neck, strongly compressed between the internal skirt of the nozzle and the external neck, both more rigid, thins more in this middle part than at its flared end. The part of the internal neck concerned is thus "choked", which contributes, with the friction on the walls, to retain the internal tube inside the external tube.
- a weak expansion at zero at the end of the skirt; the frustoconical part of the outer wall of the internal skirt of the nozzle facilitates the positioning of the latter above the necks and makes it possible to avoid the accordion-shaped deformation of the internal neck.
Pour améliorer l'étanchéité, l'extrémité du goulot externe métallique est déformée de telle sorte qu'elle vient prendre appui sur la paroi intérieure de l'embout. Le contact entre les deux extrémités de goulot déformées est ainsi maintenu entre le fond de la jupe interne et celle de la jupe externe de l'embout. Pour faciliter l'arrivée de l'extrémité du goulot externe en butée sur la jupe externe du manchon, le fond de cette dernière est épaisse et sa paroi intérieure est lisse, de diamètre sensiblement égal au diamètre extérieur du goulot externe augmenté d'une valeur inférieure à l'écart entre le diamètre de la partie cylindrique de la jupe interne de l'embout et le diamètre initial de l'orifice interne.To improve sealing, the end of the metallic external neck is deformed so that it comes to bear on the inner wall of the mouthpiece. The contact between the two deformed neck ends is thus maintained between the bottom of the internal skirt and that of the external skirt of the mouthpiece. To facilitate the arrival of the end of the external neck in abutment on the outer skirt of the sleeve, the bottom of the latter is thick and its wall inside is smooth, with a diameter substantially equal to the outside diameter of the external neck increased by a value less than the difference between the diameter of the cylindrical part of the internal skirt of the nozzle and the initial diameter of the internal orifice.
Le goulot interne est assez épais, ce qui permet de diminuer l'influence d'une éventuelle surépaisseur locale de la paroi extérieure du goulot interne sur la qualité du serrage et de l'étanchéité. Par rapport aux embouts de forme simple de l'art antérieur, l'embout selon l'invention présente l'avantage de situer le contact étanche sur le premier diamètre rencontré par le produit. Il n'y a pas de risque de rétention du produit dans des zones périphériques plus ou moins sollicitées au cours de l'utilisation du tube. D'autre part, le contact intime est situé sur le plus petit diamètre, ce qui permet d'obtenir un serrage plus intense et plus efficace pour une différence de diamètre donnée.The internal neck is quite thick, which reduces the influence of a possible local excess thickness of the external wall of the internal neck on the quality of tightening and sealing. Compared to simple-shaped tips of the prior art, the tip according to the invention has the advantage of locating the tight contact on the first diameter encountered by the product. There's no risk of product retention in more or less peripheral areas stressed during the use of the tube. On the other hand, intimate contact is located on the smallest diameter, which allows a more intense tightening and more efficient for a given diameter difference.
De préférence, l'embout est en une matière plus dure et plus rigide que la matière du tube interne, qui est également moins dure et moins rigide que celle du tube externe. Une solution utilisant du polypropylène (PP) pour l'embout, de l'aluminium recuit pour le tube externe et du polyéthylène basse densité (PE.BD) pour le tube interne donne de bons résultats.Preferably, the tip is made of a harder and more rigid material than the material of the inner tube, which is also less hard and less rigid than that of the outer tube. A solution using polypropylene (PP) for the tip, annealed aluminum for the outer tube and low density polyethylene (PE.BD) for the inner tube gives good results.
La jupe interne de l'embout doit être suffisamment mince pour laisser un orifice apte au débit de distribution du produit et suffisamment épaisse pour imposer les déformations recherchées aux deux goulots, tout en résistant mécaniquement aux efforts qui ont été engendrés au cours de l'enfoncement à force de l'embout et qui persistent, tout en se relaxant, tout au long de l'utilisation du tube. La jupe est de préférence en continuité de matière avec l'embout, par exemple moulée dans matière plastique rigide, telle que du polypropylène. Le tube externe, en aluminium, est entièrement recuit après mise en forme, ce qui lui confère une certaine souplesse dans ses zones minces. Le tube interne est en un matériau le plus souple et le moins dur possible, résistant bien à la fissuration sous contrainte en présence d'un milieu agressif tel qu'une teinture de cheveu. Il est de préférence en une matière plastique telle que du polyéthylène basse densité. Un moulage séparé de la tête et la fixation de celle-ci sur une jupe extrudée ou laminée soudée, ces deux opérations pouvant s'effectuer simultanément par surmoulage, permet de choisir une matière plastique différente pour la tête et pour la jupe, toutes deux devant être cependant résistantes chimiquement au produit que le tube est destiné à contenir.The inner skirt of the nozzle must be thin enough to leave an opening suitable for product delivery rate and thick enough to impose the deformations sought at the two necks, while resisting mechanically to the forces which were generated during the sinking by dint of the tip and which persist, while relaxing, throughout the use of the tube. The skirt is preferably in continuity of material with the end piece, for example molded in rigid plastic material, such as polypropylene. The outer aluminum tube is fully annealed after shaping, which gives it flexibility in its thin areas. The inner tube is made of the most flexible and as hard as possible material, resistant to stress cracking in the presence of an aggressive medium such as than a hair dye. It is preferably made of a plastic material such than low density polyethylene. Separate molding of the head and fixing of the latter on an extruded or laminated welded skirt, these two operations can be performed simultaneously by overmolding, allows to choose a different plastic for the head and the skirt, both in front however be chemically resistant to the product that the tube is intended to contain.
Après avoir choisi les matériaux respectifs des tubes et de l'embout en fonction des produits à conditionner, la demanderesse a testé différentes géométries en faisant varier notamment les diamètres et les épaisseurs des goulots et des jupes de l'embout. Les meilleures conditions d'étanchéité ont été obtenues avec un goulot interne approximativement aussi épais que la partie cylindrique de la jupe interne de l'embout. Le goulot externe peut être moins épais que les deux autres, le métal étant nettement plus rigide. En son extrémité sommitale, il peut être encore aminci jusqu'à typiquement la moitié de l'épaisseur du goulot interne de façon à ce qu'il s'évase plastiquement sans grande résistance, ce qui facilite l'évasement du goulot interne, ce dernier restant plus épais que dans la partie médiane. Le goulot interne se trouve ainsi "pincé" dans sa partie médiane entre une extrémité évasée non ou peu amincie et une base non déformée, son piégeage contribuant à maintenir fermement le tube interne à l'intérieur du tube externe.After having chosen the respective materials of the tubes and the end piece according products to be packaged, the applicant has tested different geometries in varying in particular the diameters and thicknesses of necks and skirts from the mouthpiece. The best sealing conditions were obtained with a internal neck approximately as thick as the cylindrical part of the internal end cap skirt. The external neck may be thinner than the two others, the metal being much more rigid. At its summit end, it can be further thinned to typically half the thickness of the neck internal so that it flares plastically without great resistance, which facilitates the flaring of the internal neck, the latter remaining thicker than in the middle part. The internal neck is thus "pinched" in its middle part between a flared end that is not or little thinned and a non-deformed base, its trapping helping to firmly maintain the inner tube inside the outer tube.
Au moment de l'assemblage, la déformation imposée par la jupe interne de l'embout correspond à un serrage de 3 à 8%, de préférence 4% à 6%, c'est-à-dire que le diamètre extérieur de la partie cylindrique de la jupe interne de l'embout est supérieur, de 5% environ, au diamètre initial de l'orifice interne. Un serrage plus faible ne donne pas des conditions d'étanchéité satisfaisantes tout au long de la durée d'utilisation du tube. En effet, un certain desserrage, plus ou moins fort suivant le serrage initial est constaté au bout de quelques semaines à la température ambiante. Un serrage plus important entraíne, au cours de l'enfoncement de l'embout sur les goulots, soit une déformation en accordéon du goulot du tube interne, soit, si l'épaisseur du goulot interne est importante, un enfoncement insuffisant rendant l'assemblage impossible.At the time of assembly, the deformation imposed by the internal skirt of the nozzle corresponds to a tightening of 3 to 8%, preferably 4% to 6%, that is to say that the outside diameter of the cylindrical part of the internal skirt of the nozzle is greater, by approximately 5%, than the initial diameter of the internal orifice. A weaker tightening does not give satisfactory sealing conditions all throughout the life of the tube. Indeed, a certain loosening, more or weaker after initial tightening is observed after a few weeks at Room temperature. A greater tightening results, during the insertion of the end piece on the necks, or an accordion deformation of the neck of the inner tube, or, if the thickness of the inner neck is large, a insufficient penetration making assembly impossible.
Un deuxième objet de l'invention concerne l'embout lui-même comportant un fond et une jupe externe munie de moyens d'encliquetage et d'anti-rotation, caractérisé en ce qu'il comporte, également attachée à son fond, une jupe interne dont le profil de la paroi extérieure est globalement tronconique, l'extrémité ouverte de la jupe étant orientée vers l'apex du cône. De préférence cette jupe interne est plus épaisse à proximité de son attache sur le fond de l'embout. Elle a avantageusement une paroi intérieure cylindrique et une paroi extérieure cylindro-bitronconique, les parties tronconiques et cylindriques ayant approximativement la même hauteur, les parties tronconiques faisant un demi-angle au sommet compris entre 5 et 20°. Cet embout est de préférence en un matériau plastique dur, tel que du polypropylène.A second object of the invention relates to the nozzle itself comprising a bottom and an external skirt provided with latching and anti-rotation means, characterized in that it includes, also attached to its bottom, a skirt internal whose profile of the external wall is generally frustoconical, the open end of the skirt being oriented towards the apex of the cone. Preferably this internal skirt is thicker near its fastener on the bottom of the mouthpiece. It advantageously has a cylindrical inner wall and a wall external cylindro-bitronconic, the frustoconical and cylindrical parts having approximately the same height, the frustoconical parts making a half-angle at the summit between 5 and 20 °. This nozzle is preferably in one hard plastic material, such as polypropylene.
D'autres caractéristiques et avantages apparaítront dans la description d'un mode de réalisation d'une modalité particulière de l'invention donnée ci-après à titre d'exemple nullement limitatif.Other characteristics and advantages will appear in the description of a embodiment of a particular modality of the invention given below by way of non-limiting example.
La figure 1 représente la coupe axiale d'une tête de tube à double paroi selon l'invention surmontée de l'embout avant enfoncement à force de ce dernier sur les goulots interne et externe.Figure 1 shows the axial section of a double-walled tube head according to the invention surmounted by the end fitting before being forced into it internal and external bottlenecks.
La figure 2 représente la tête de tube à double paroi selon l'invention après enfoncement à force de l'embout sur les goulots. La partie gauche est une demi-coupe axiale par un plan diamétral passant une ailette longitudinale de l'embout, la partie droite est une demi-coupe axiale par un plan diamétral passant par une ailette longitudinale du goulot externe.FIG. 2 represents the double-walled tube head according to the invention after forced insertion of the nozzle on the necks. The left side is a axial half-section through a diametral plane passing a longitudinal fin of the nozzle, the right part is an axial half-section through a diametrical plane passing through a longitudinal fin of the external neck.
Le tube à double paroi 1 comporte un tube interne 10 et d'un tube externe 20
en aluminium recuit. Le tube interne 10 est obtenu par surmoulage d'une tête
12 en PE.BD (polyéthylène basse densité) sur une jupe 13, également en
polyéthylène, de diamètre 24,3 mm et d'épaisseur 250 microns. Le goulot
interne 11 délimite un orifice interne 14. Son extrémité sommitale est la tranche
18. Le tube externe 20 en aluminium recuit a une jupe 25 de diamètre externe
25 mm et une épaisseur de 120 microns. Il possède une épaule 24 et un goulot
21 dont l'extrémité sommitale est la tranche 28. The double-walled tube 1 comprises an
Le diamètre externe du goulot interne 11 et le diamètre interne du goulot
externe 21 sont égaux à 8,7 mm. Le goulot interne 11 a une épaisseur de 0,75
millimètres. Le goulot externe 21, d'épaisseur de 0,5 millimètres est muni, sur sa
paroi extérieure, d'un bourrelet d'encliquetage 23 situé à la base du goulot et
d'ailettes longitudinales 22 qui s'étendent le long de ladite paroi extérieure
jusqu'à 1 mm de l'extrémité. Le tube interne 10 est introduit dans le tube externe
en aluminium par des moyens classiques: un mandrin s'enfile à l'intérieur du
tube interne et l'entraíne à l'intérieur du tube externe dont l'épaule et la tête
sont immobilisées par un outillage qui en épouse la forme extérieure. En fin
d'enfilage, la tranche 18 du goulot interne 11 dépasse la tranche 28 du goulot
externe 21 de quelques dixièmes de millimètres. Le goulot externe et le goulot
interne ont une hauteur de contact commune H de 4,7 mm environ.The external diameter of the internal neck 11 and the internal diameter of the
Après mise en contact des deux tubes 10 et 20 par leurs goulots 11 et 21, on
vient enfoncer à force l'embout 30, le tube interne 10 étant toujours maintenu
sur son mandrin.After bringing the two
L'embout 30 possède une jupe interne 31, un fond 34 et une jupe externe 35
munie sur sa paroi intérieure d'ailettes 42 qui sont destinées, en combinaison
avec les ailettes 22 du goulot externe 20, à immobiliser en rotation l'embout 30
et, sur sa paroi extérieure, d'un filetage 41, en vue du vissage d'une capsule
destinée à boucher l'orifice de distribution 40. La partie cylindrique 32 de la jupe
interne 31 a pour diamètre 7,5 mm, ce qui impose un serrage de 0,3 mm
lorsque l'embout 30 est enfoncé sur les goulots 11 et 21. L'effet d'un certain
fluage se fait sentir au bout de quelques jours, entraínant une déformation
permanente des deux goulots et une diminution du serrage. Ce dernier reste
néanmoins supérieur à 0,1 mm.The
La jupe interne 31 de l'embout 30 a une paroi intérieure cylindrique délimitant un orifice de distribution 40 circulaire de 6,1 mm de diamètre et une paroi extérieure de forme cylindro-bitronconique, les troncs de cône ayant leurs apex, c'est-à-dire les sommets des cônes sur lesquels ils s'appuient, dans la même direction que l'extrémité ouverte 39 de la jupe 31. D'une hauteur de 4 mm entre la paroi intérieure 38 du fond 34 et l'extrémité ouverte 39, cette paroi est partagée en trois zones:
- une zone centrale, haute de 1,5 mm, cylindrique et d'épaisseur 0,75 mm,
- une zone d'attache, tronconique, haute de 1 mm, s'élargissant jusqu'à un diamètre de 8 mm au niveau de l'attache 33 sur le fond 34 de l'embout 30. Le demi-angle du tronc de cône est de 12° environ.
- une zone d'extrémité, haute de 1,5 mm, tronconique et de demi-angle 15°.
- a central zone, 1.5 mm high, cylindrical and 0.75 mm thick,
- an attachment zone, frustoconical, 1 mm high, widening to a diameter of 8 mm at the level of the
attachment 33 on the bottom 34 of theend piece 30. The half-angle of the truncated cone is about 12 °. - an end zone, 1.5 mm high, frustoconical and with a 15 ° half-angle.
La jupe externe 35 de l'embout 30 a du côté de son attache une partie épaisse
36, dont la paroi intérieure, lisse, de diamètre 9,8 mm, ne vient pas buter contre
les ailettes 22 d'anti-rotation du goulot externe.The
Au cours de l'enfoncement de l'embout 30, les ailettes 42 s'introduisent dans les
intervalles laissés par les ailettes 22 du goulot externe 21, la partie cylindrique 32
de la jupe interne 31 de l'embout 30 impose aux goulots une expansion de 0,3
mm puis la partie tronconique 33 proche de l'attache au fond 34 de l'embout
30 impose un évasement à l'ensemble des extrémités des goulots 11 et 21. Le
goulot externe 21, de diamètre extérieur 9,7 mm s'évase de 0,1 mm puis vient
s'appuyer sur cette partie lisse de la paroi intérieure de la jupe externe 35 de
l'embout 30. During the insertion of the
La jupe externe 35 de l'embout 30 est également munie vers son extrémité
ouverte d'un bourrelet d'encliquetage 37. La position de ce bourrelet
d'encliquetage 37 par rapport au fond 34 de l'embout 30 est choisie de telle
sorte qu'en fin d'encliquetage, il n'y ait pas appui de la face interne 38 du fond
34 de l'embout 30 sur les extrémités sommitales évasées des goulots 11 et 21.
Cette position est aussi telle que le début de l'évasement se produit avant le
début de l'encliquetage, ce qui diminue les efforts nécessaires à l'enfoncement
de l'embout.The
Sur la figure 2, on observe qu'après enfoncement à force de l'embout 30, la
paroi intérieure 38 du fond 34 de l'embout 31 ne vient en appui ni sur la tranche
18 du goulot interne 11 ni sur la tranche 28 du goulot externe 21. D'autre part, la
partie de la jupe interne 31 de l'embout 30 qui a un diamètre supérieur au
diamètre de l'orifice interne 14 agit sur les goulots sur une hauteur h de 2,6 mm
environ, soit un peu plus de la moitié de la hauteur de contact H commune aux
deux goulots.In FIG. 2, it can be seen that after pressing the
Une cinquantaine de tubes à double paroi réalisés selon cette modalité de l'invention ont subi ce test, qui consiste à injecter de l'air à l'intérieur des tubes jusqu'à obtenir une surpression de 500 g/cm2. Ces tubes sont ensuite bouchés puis plongés dans de l'eau pendant 30 secondes. Aucune fuite n'a été décelée.Fifty double-walled tubes produced using this method of the invention have undergone this test, which consists in injecting air inside the tubes until an overpressure of 500 g / cm2 is obtained. These tubes are then plugged then immersed in water for 30 seconds. No leaks were detected.
- Assemblage de têtes de tube interne et tube externe facilité, ne nécessitant pas le pliage de l'extrémité du goulot interne par-dessus l'extrémité du goulot externe;Easy assembly of inner tube heads and outer tube, requiring no not bend the end of the internal neck over the end of the neck external;
- Réalisation d'un tube interne par tout procédé, la paroi externe n'étant pas nécessairement parfaitement lisse pour obtenir une bonne étanchéité;Production of an internal tube by any process, the external wall not being necessarily perfectly smooth to obtain a good seal;
- Réalisation du tube interne, du tube externe et de l'embout dans des tolérances géométriques peu contraignantes;Production of the inner tube, the outer tube and the end piece in undemanding geometric tolerances;
- Possibilité de réalisation du tube interne par surmoulage sur une jupe: la tête et la jupe du tube interne peuvent être en des matériaux différents, cependant compatibles en fusion.Possibility of making the inner tube by overmolding on a skirt: the head and the skirt of the inner tube may be of different materials, however compatible in fusion.
Claims (11)
- Double-walled tube (1) intended to store and dispense corrosive products, comprising an internal tube (10) having a skirt (13), a shoulder (12) and an inner neck (11) that defines an inner opening (14) and an external metal tube having a skirt (25), a shoulder (24) and an outer neck (21), the two tubes being connected together at their necks (11 and 21) by a nozzle (30) comprising a base (34) and at least one outer skirt (35), characterized in that the nozzle (30) is also provided with a inner skirt (31) such that when the nozzle (30) is forced downward, said inner and outer necks are embedded between said inner and outer skirts, the outer surface of said inner skirt having a globally tapered profile and causing circumferential expansion of the central parts of the necks (11 and 21) and flare of said necks ends.
- Double-walled tube (1) of claim 1 characterized in that play exists between the inner surface (38) of base (34) of the nozzle (30) and the edges (18 and 28) of the inner tubes (10) and the outer tubes (20).
- Double-walled tube (1) of claims 1 or 2 characterized in that the inner neck (11) is a hollow cylinder with a height/thickness ratio lower than 10.
- Double-walled tube (1) of any of claims 1 to 3 characterized in that the nozzle (30) comprises a thread (41) on the outer surface of outer skirt (35) that is intended to connect a seal by screwing and anti-rotation means (42) on the inner surface of the outer skirt that match the anti-rotation means (22) located on the outer surface of outer neck (21).
- Double-walled tube (1) of any of claims 1 to 4 characterized in that the outer neck (21) and the outer skirt (35) of the nozzle (30) are provided with matching snap-on means (23 and 37).
- Double-walled tube (1) of any of claims 1 to 5 characterized in that the inner skirt (31) of nozzle (30) has an outer surface in three sections, the central part being cylindrical, the other two being tapered.
- Double-walled tube (1) of any of claims 1 to 6 characterized in that the end of outer neck (21) is brought to stop against the inner surface of outer skirt (35) of nozzle (30).
- Double-walled tube (1) of any of claims 1 to 7 characterized in that the inner neck (11) is made of a substance that is less hard and less stiff than the outer neck (21) and the inner skirt (31) of nozzle (30).
- Double-walled tube (1) of claim 8 characterized in that the inner neck (11) is made of low-density polyethylene, the outer neck (21) of annealed aluminum and the inner skirt (31) of nozzle (30) of polypropylene.
- Double-walled tube (1) of any of claims 1 to 9 characterized in that the end of outer neck (21) is generally thinned to a thickness equal to half that of the inner neck (11).
- Double-walled tube (1) of any of claims 1 to 10 characterized in that the inner skirt (31) of nozzle (30) has a greater diameter in the cylindrical section than the original diameter of inner opening (14), the relative difference being between 3 and 8%.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9702957 | 1997-03-07 | ||
FR9702957A FR2760435B1 (en) | 1997-03-07 | 1997-03-07 | DOUBLE WALL TUBE WITH EXTERNAL METAL ENCLOSURE AND INTERNAL PLASTIC ENVELOPE |
PCT/FR1998/000427 WO1998040283A1 (en) | 1997-03-07 | 1998-03-04 | Double-walled tube with outer metal shell and inner plastic sheath |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0964820A1 EP0964820A1 (en) | 1999-12-22 |
EP0964820B1 true EP0964820B1 (en) | 2002-10-09 |
Family
ID=9504672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98913828A Expired - Lifetime EP0964820B1 (en) | 1997-03-07 | 1998-03-04 | Double-walled tube with outer metal shell and inner plastic sheath |
Country Status (11)
Country | Link |
---|---|
US (1) | US6170705B1 (en) |
EP (1) | EP0964820B1 (en) |
JP (1) | JP2001514603A (en) |
CN (1) | CN1248950A (en) |
AU (1) | AU6838698A (en) |
BR (1) | BR9808833A (en) |
CZ (1) | CZ289754B6 (en) |
DE (1) | DE69808598T9 (en) |
ES (1) | ES2181194T3 (en) |
FR (1) | FR2760435B1 (en) |
WO (1) | WO1998040283A1 (en) |
Families Citing this family (27)
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---|---|---|---|---|
DE19807768A1 (en) * | 1998-02-24 | 1999-08-26 | Bericap Gmbh & Co | Closure for bucket or tub-shaped plastic container has inwards directed |
DE19936189A1 (en) * | 1999-07-31 | 2001-02-15 | Rowenta Werke Gmbh | Iron coat |
US6632199B1 (en) * | 2000-05-23 | 2003-10-14 | Becton Dickinson And Company | Syringe assembly including plastic tip cap |
EP1283804B1 (en) * | 2000-05-25 | 2005-12-21 | CROWN Packaging Technology, Inc. | Dispensing closure |
FR2810641B1 (en) * | 2000-06-21 | 2002-10-18 | Cebal | FLEXIBLE TUBE PROVIDED WITH A LARGE DIAMETER NECK AND RIGID TIP TO BE FIXED ON SAID TUBE |
JP2002337908A (en) * | 2001-05-18 | 2002-11-27 | Mikasa Sangyo Kk | Container equipped with function for preventing inner stopper from corotating, and inner stopper thereof |
DE10137937A1 (en) * | 2001-08-07 | 2003-03-06 | Maegerle Karl Lizenz | packaging container |
US7204381B2 (en) | 2001-12-31 | 2007-04-17 | Pechiney Plastic Packaging, Inc. | Waterguard tube |
CA2495582C (en) | 2002-08-13 | 2016-07-12 | Medical Instill Technologies, Inc. | Container and valve assembly for storing and dispensing substances, and related method |
USD650067S1 (en) | 2002-10-16 | 2011-12-06 | Medical Instill Technologies, Inc. | Dispenser |
US7600999B2 (en) * | 2003-02-26 | 2009-10-13 | Align Technology, Inc. | Systems and methods for fabricating a dental template |
WO2004096113A2 (en) | 2003-04-28 | 2004-11-11 | Medical Instill Technologies, Inc. | Container with valve assembly for filling and dispensing substances, and apparatus and method for filling |
EP1636091A2 (en) * | 2003-05-12 | 2006-03-22 | Medical Instill Technologies, Inc. | Dispenser and apparatus for filling a dispenser |
US7226231B2 (en) * | 2003-07-17 | 2007-06-05 | Medical Instill Technologies, Inc. | Piston-type dispenser with one-way valve for storing and dispensing metered amounts of substances |
US7845517B2 (en) * | 2003-12-10 | 2010-12-07 | Medical Instill Technologies Inc. | Container and one-way valve assembly for storing and dispensing substances, and related method |
US7264142B2 (en) | 2004-01-27 | 2007-09-04 | Medical Instill Technologies, Inc. | Dispenser having variable-volume storage chamber and depressible one-way valve assembly for dispensing creams and other substances |
US20060032866A1 (en) * | 2004-08-13 | 2006-02-16 | Pechiney Plastic Packaging, Inc. | Plastic dispensing container having reduced moisture penetration and method for same |
WO2006063360A2 (en) * | 2004-12-10 | 2006-06-15 | Medical Instill Technologies, Inc. | Container and valve assembly for storing and dispensing substances, and related method |
US20060278642A1 (en) * | 2005-06-10 | 2006-12-14 | Owens-Illinois Closure Inc. | Plastic closure for containers |
US20090152294A1 (en) * | 2007-12-12 | 2009-06-18 | Mizell Jeffrey W | Dual-Tube Product Container and Dispenser |
US8906187B2 (en) * | 2008-06-25 | 2014-12-09 | Colgate-Palmolive Company | Method of making shoulder/nozzles with film barrier liners |
DE102010052768A1 (en) * | 2010-11-30 | 2012-05-31 | Krones Aktiengesellschaft | Sampling container and its use and method for sampling |
CN104340498A (en) * | 2013-07-29 | 2015-02-11 | 刘晗宇 | Toothpaste packing bag |
US10994900B2 (en) * | 2014-04-24 | 2021-05-04 | Kimberly Winthrop | Novelty vessel accessory |
JP6759854B2 (en) * | 2016-08-24 | 2020-09-23 | 凸版印刷株式会社 | Tube container |
BR112020006638A2 (en) | 2017-10-13 | 2020-10-06 | Scholl's Wellness Company Llc | foot care product dispensing kiosk |
CN116685531A (en) * | 2021-01-12 | 2023-09-01 | 即时品牌控股有限公司 | Polysiloxane food and beverage storage container |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07277349A (en) * | 1994-04-06 | 1995-10-24 | Takeuchi Press Ind Co Ltd | Double tube |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1379235A (en) * | 1963-12-20 | 1964-11-20 | Perfectube | Protective end cap for flexible metal tubes for packaging as well as packaging fitted with this end cap |
FR2322058A1 (en) * | 1975-08-29 | 1977-03-25 | Taisei Kako Co | Double walled tube for creams - having inner tube of thermoplastic resin, metal outer tube, and integral closure section |
DE29502931U1 (en) * | 1995-02-22 | 1995-04-06 | Cebal Verpackungen | Internally coated aluminum tube |
-
1997
- 1997-03-07 FR FR9702957A patent/FR2760435B1/en not_active Expired - Fee Related
-
1998
- 1998-03-04 WO PCT/FR1998/000427 patent/WO1998040283A1/en active IP Right Grant
- 1998-03-04 CZ CZ19993170A patent/CZ289754B6/en not_active IP Right Cessation
- 1998-03-04 CN CN98802836A patent/CN1248950A/en active Pending
- 1998-03-04 US US09/367,047 patent/US6170705B1/en not_active Expired - Fee Related
- 1998-03-04 AU AU68386/98A patent/AU6838698A/en not_active Abandoned
- 1998-03-04 EP EP98913828A patent/EP0964820B1/en not_active Expired - Lifetime
- 1998-03-04 ES ES98913828T patent/ES2181194T3/en not_active Expired - Lifetime
- 1998-03-04 JP JP53927298A patent/JP2001514603A/en active Pending
- 1998-03-04 BR BR9808833-5A patent/BR9808833A/en active Search and Examination
- 1998-03-04 DE DE69808598T patent/DE69808598T9/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07277349A (en) * | 1994-04-06 | 1995-10-24 | Takeuchi Press Ind Co Ltd | Double tube |
Also Published As
Publication number | Publication date |
---|---|
EP0964820A1 (en) | 1999-12-22 |
CZ289754B6 (en) | 2002-03-13 |
JP2001514603A (en) | 2001-09-11 |
ES2181194T3 (en) | 2003-02-16 |
DE69808598T2 (en) | 2003-06-05 |
CZ9903170A3 (en) | 2001-12-12 |
AU6838698A (en) | 1998-09-29 |
WO1998040283A1 (en) | 1998-09-17 |
US6170705B1 (en) | 2001-01-09 |
FR2760435B1 (en) | 1999-04-16 |
DE69808598T9 (en) | 2004-09-23 |
DE69808598D1 (en) | 2002-11-14 |
BR9808833A (en) | 2000-07-04 |
FR2760435A1 (en) | 1998-09-11 |
CN1248950A (en) | 2000-03-29 |
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