EP1077882B1 - Screw top with a groove for receiving a joint and mould for producing such a top - Google Patents
Screw top with a groove for receiving a joint and mould for producing such a top Download PDFInfo
- Publication number
- EP1077882B1 EP1077882B1 EP99916989A EP99916989A EP1077882B1 EP 1077882 B1 EP1077882 B1 EP 1077882B1 EP 99916989 A EP99916989 A EP 99916989A EP 99916989 A EP99916989 A EP 99916989A EP 1077882 B1 EP1077882 B1 EP 1077882B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- skirt
- thread
- cap
- groove
- rib
- 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
Links
- 238000013459 approach Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Images
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
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/04—Threaded or like caps or cap-like covers secured by rotation
- B65D41/0435—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements
Definitions
- the present invention relates to a screw cap having a circular groove at the level of its threaded skirt, as well as a mold for make such a plug.
- screw caps having a bottom and a skirt extending axially from this bottom.
- a net is made on the inner wall of the skirt and near the bottom, a circular groove intended in particular to receive a seal or obturator reported. Thanks to the seal or the shutter, it is possible to achieve a gas and liquid tightness.
- a first method consists in demolding in force the net of the cap and throat by stripping.
- the mold has a core which is inside the cap when the material is injected in the mold.
- translate the cap without perform rotation.
- the throat, as well as the threads, are deformed.
- this demolding process requires the use of a flexible or semi-rigid synthetic material.
- a second demolding process uses a mold by eclipsable core known to a person skilled in the art as a mold release DME type.
- the release is then carried out by a retraction of elements mechanics of a nucleus requiring a combination of movements in the mold.
- a central core is first removed then sectors of core are retracted and finally the part is ejected.
- a mold can be used in which the threaded core can to be unscrewed. To be able to unmold the circular groove, it is known to extend the core fillet to the upper core groove.
- the object of the present invention is to provide a screw cap having a bottom and a skirt having an internal thread extending axially with respect to the bottom, a circular groove being provided in the plug near the bottom of it, which can be removed from the mold without present the aforementioned drawbacks. So we want a cap of this type which is slightly deformed during demolding and which does not works a complex and / or fragile mold and / or friction source.
- the screw cap it offers is of the type having a bottom from which extends a skirt axially an internal thread, a substantially circular rib defining a groove made in the skirt on the side of the bottom of the cap, as well as notches and / or mortises to prevent rotation of the cap during demoulding of the latter.
- the internal thread of the skirt approaches the rib without however opening into it.
- the mold When the cap is removed from the mold, the mold is removed from the mold. thread by unscrewing, which is ideal to avoid any deformation of the thread, and the throat is demolded by a local deformation of the area against bare. During the rotation of the core, the end of the non-emerging thread of the core causes elastic deformation by continuous spacing in the throat area. The first round of unscrewing frees the throat impeccably, that is to say without significant deformation.
- the height of the rib delimiting the throat and corresponding to the counter the latter is less than the radially measured height of the net of the skirt.
- the throat is advantageously less deep as the thread is protruding.
- the skirt thread preferably approaches one millimeter at over the circular rib.
- the distance from the end of the thread to the circular rib is therefore preferably less than one millimeter. This distance must not be zero because otherwise we find the disadvantages of the prior art, but it should not be too large to favor a good deformation without creating too many constraints.
- the present invention also provides a mold for the realization of a screw cap having a bottom from which extends axially a skirt provided with an internal thread, a groove substantially circular made in the skirt on the bottom side of the cap, as well as notches and / or mortises to prevent rotation of the plug during demoulding of the latter.
- This mold has a mold base, the inner wall corresponds to the outer surface of the skirt and the bottom as well as a core intended to be removed by unscrewing having a net-like groove and a circular groove corresponding to the circular rib of the cap.
- the net-shaped groove approaches the circular groove without opening into it.
- This mold allows the production of a plug as described above.
- the circular groove is less deep than the net-like groove.
- the net-like groove is preferably approached unless one millimeter from the circular groove.
- the distance between this groove in form of thread and the circular groove is therefore between zero and one millimeter preferably.
- Figure 1 shows a screw cap with a bottom 2 to from which extends a peripheral skirt 4 axially.
- the surface inside of the skirt 4 has a thread 6 allowing the screwing of the cap on the neck of a bottle or the like fitted with a thread corresponding.
- a rib peripheral is made parallel to this bottom thus forming between this rib 8 and bottom 2 a groove 10.
- the latter is intended to receive a seal or a shutter (not shown). In this way, it is possible to perfect the sealing of the cap and make it watertight especially gases and liquids.
- a cap of this type can by example be used for corking bottles containing a drink gas.
- the thread 6 of the skirt 4 approaches the peripheral rib 8 but stops so that there remains a free space of width a between this thread 6 and the peripheral rib 8.
- the width a is for example 0.5 mm.
- notches 12 and notches 14 follow one another over the entire periphery of the skirt 4. These notches 12 and notches 14 make it possible to maintain the plug and prevent it from turning when the cap is removed from the mold by unscrewing the inner core.
- Figure 2 shows the core 16 and an anti-rotation ring 18 of a mold for molding the plug presented in FIG. 1.
- the upper part of the core 16 corresponds to the groove 10 of the plug.
- a peripheral groove 20 corresponds to the peripheral rib 8 of the plug.
- the thread 6 does not touch the rib peripheral 8
- the helical groove 22 of the core does not open into the peripheral groove 20 of this core.
- the anti-rotation ring 18 surrounds the core 16. It has notches 24 and notches 26 which correspond respectively to the notches 12 and notches 14 of the plug.
- the anti-rotation ring is held fixed to prevent rotation of the cap and the core is unscrewed.
- the end of the thread 6 lying close of the peripheral rib 8 will come out of the helical groove 22 of the core thus locally deforming the plug in a direction which favors the demoulding of the peripheral rib 8.
- the deformation progresses peripherally thus allowing a progressive release of the peripheral rib 8.
- a plug is obtained in which the peripheral rib 8 has an edge well parallel to the bottom 2. We thus find by proceeding when unscrewing the core during demolding to a slightly deformed edge of the groove comparable to that which can be obtained by using an eclipsable core.
- the fact of not extending the net 6 to the peripheral rib 8 allows, with short demolding times and a relatively mold simple, to obtain a slightly deformed groove for housing a seal or a shutter.
- the notches and notches of the cap and the anti-rotation ring could be replaced by tenons and mortises, the pins being for example at the level of the anti-rotation ring and mortises at the plug or vice versa.
- the cap shown has only one thread. Onne would depart from the scope of the invention if the plug had several threads.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Tables And Desks Characterized By Structural Shape (AREA)
- Confectionery (AREA)
Abstract
Description
La présente invention concerne un bouchon à vis présentant une gorge circulaire au niveau de sa jupe filetée, ainsi qu'un moule pour réaliser un tel bouchon.The present invention relates to a screw cap having a circular groove at the level of its threaded skirt, as well as a mold for make such a plug.
Il est connu de réaliser des bouchons à vis présentant un fond et une jupe s'étendant axialement à partir de ce fond. Un filet est réalisé sur la paroi intérieure de la jupe et à proximité du fond on réalise une gorge circulaire destinée à recevoir notamment un joint ou obturateur rapporté. Grâce au joint ou à l'obturateur, il est possible de réaliser une étanchéité aux gaz et aux liquides.It is known to produce screw caps having a bottom and a skirt extending axially from this bottom. A net is made on the inner wall of the skirt and near the bottom, a circular groove intended in particular to receive a seal or obturator reported. Thanks to the seal or the shutter, it is possible to achieve a gas and liquid tightness.
Il existe actuellement plusieurs procédés permettant de réaliser un tel bouchon (voir par exemple le docement US-A-5 281 385).There are currently several methods for achieving such a plug (see for example document US-A-5,281,385).
Un premier procédé consiste à démouler en force le filet du bouchon et la gorge par dévêtissage. Dans ce cas, le moule comporte un noyau qui se trouve à l'intérieur du bouchon lorsque la matière est injectée dans le moule. Pour démouler le bouchon, on translate le bouchon sans effectuer de rotation. On a alors une déformation de la pièce due à l'arrachement du noyau. La gorge, de même que les filets, sont déformés. Au niveau de la gorge, il est nécessaire de prévoir un angle entre le bord destiné à retenir un joint ou un obturateur et le fond du bouchon afin de faciliter le retrait du noyau. Ceci va à l'encontre d'une bonne tenue du joint ou de l'obturateur.A first method consists in demolding in force the net of the cap and throat by stripping. In this case, the mold has a core which is inside the cap when the material is injected in the mold. To unmold the cap, translate the cap without perform rotation. We then have a deformation of the part due to removal of the nucleus. The throat, as well as the threads, are deformed. At the level of the groove, it is necessary to provide an angle between the edge intended to retain a seal or a shutter and the bottom of the cap in order to facilitate removal of the nucleus. This goes against a good behavior of the seal or shutter.
Les contraintes mécaniques subies par le bouchon lors du démoulage par ce procédé sont relativement importantes, et la zone de dévêtissage, qui se trouve du côté du fond du bouchon, est éloignée de la zone de contre-dépouille qui se trouve du côté de l'extrémité libre de la jupe du bouchon.The mechanical stresses undergone by the plug during mold release by this process are relatively large, and the area of stripping, which is on the bottom side of the cap, is away from the undercut area which is on the side of the free end of the cap skirt.
En outre, ce procédé de démoulage nécessite l'utilisation d'une matière synthétique souple ou semi-rigide.In addition, this demolding process requires the use of a flexible or semi-rigid synthetic material.
Un second procédé de démoulage met en oeuvre un moule par noyau éclipsable connu de l'homme du métier sous le nom de démoulage de type DME. Le démoulage est alors réalisé par une rétraction d'éléments mécaniques d'un noyau nécessitant une combinaison de mouvements dans le moule. Un noyau central est tout d'abord retiré puis des secteurs de noyau sont rétractés et enfin la pièce est éjectée.A second demolding process uses a mold by eclipsable core known to a person skilled in the art as a mold release DME type. The release is then carried out by a retraction of elements mechanics of a nucleus requiring a combination of movements in the mold. A central core is first removed then sectors of core are retracted and finally the part is ejected.
L'inconvénient de ce type de démoulage est qu'il nécessite un temps de cycle de moulage long. De plus, le moule est un moule fragile car il met en oeuvre des pièces mécaniques fragiles et on a une usure des éléments qui sont en frottement les uns contre les autres.The disadvantage of this type of demolding is that it requires a long molding cycle time. In addition, the mold is a fragile mold because it uses fragile mechanical parts and there is wear on the elements that are rubbing against each other.
Enfin, on peut utiliser un moule dans lequel le noyau fileté peut être dévissé. Pour pouvoir alors démouler la gorge circulaire, il est connu de prolonger le filet du noyau jusque dans la gorge supérieure du noyau.Finally, a mold can be used in which the threaded core can to be unscrewed. To be able to unmold the circular groove, it is known to extend the core fillet to the upper core groove.
On a alors, lors du dévissage du noyau, une déformation importante de la pièce moulée dans la zone de la gorge. Pour limiter la déformation, il est connu de prévoir des secteurs de gorge plutôt que d'avoir une gorge continue sur toute la circonférence du fond du bouchon.There is then, during the unscrewing of the core, a deformation important part molded in the throat area. To limit the deformation, it is known to provide throat sectors rather than to have a continuous groove around the entire circumference of the bottom of the stopper.
La présente invention a pour but de fournir un bouchon à vis comportant un fond et une jupe présentant un filet intérieur s'étendant axialement par rapport au fond, une gorge circulaire étant prévue dans le bouchon à proximité du fond de celui-ci, qui puisse être démoulé sans présenter les inconvénients précités. On souhaite donc un bouchon de ce type qui soit peu déformé lors du démoulage et qui ne mette pas en oeuvre un moule complexe et/ou fragile et/ou source de frottement.The object of the present invention is to provide a screw cap having a bottom and a skirt having an internal thread extending axially with respect to the bottom, a circular groove being provided in the plug near the bottom of it, which can be removed from the mold without present the aforementioned drawbacks. So we want a cap of this type which is slightly deformed during demolding and which does not works a complex and / or fragile mold and / or friction source.
À cet effet, le bouchon à vis qu'elle propose est du type comportant un fond à partir duquel s'étend axialement une jupe présentant un filet intérieur, une nervure sensiblement circulaire délimitant une gorge réalisée dans la jupe du côté du fond du bouchon, ainsi que des crans et/ou mortaises permettant d'éviter une rotation du bouchon lors du démoulage de ce dernier.For this purpose, the screw cap it offers is of the type having a bottom from which extends a skirt axially an internal thread, a substantially circular rib defining a groove made in the skirt on the side of the bottom of the cap, as well as notches and / or mortises to prevent rotation of the cap during demoulding of the latter.
Selon l'invention, le filet intérieur de la jupe s'approche de la nervure sans toutefois déboucher dans celle-ci.According to the invention, the internal thread of the skirt approaches the rib without however opening into it.
Lors du démoulage de ce bouchon, on réalise le démoulage du filet par dévissage, ce qui est idéal pou éviter toute déformation du filet, et la gorge est démoulée par une déformation locale de la zone en contre dépouille. Lors de la rotation du noyau, la fin de filet non débouchante du noyau provoque une déformation élastique par écartement continu dans la zone de la gorge. Le premier tour de dévissage permet de libérer la gorge d'une façon impeccable, c'est à dire sans déformation importante.When the cap is removed from the mold, the mold is removed from the mold. thread by unscrewing, which is ideal to avoid any deformation of the thread, and the throat is demolded by a local deformation of the area against bare. During the rotation of the core, the end of the non-emerging thread of the core causes elastic deformation by continuous spacing in the throat area. The first round of unscrewing frees the throat impeccably, that is to say without significant deformation.
Pour obtenir un meilleur résultat, c'est à dire limiter les déformations au niveau de la gorge du bouchon lors du démoulage, la hauteur de la nervure délimitant la gorge et correspondant à la contre dépouille de celle-ci est inférieure à la hauteur mesurée radialement du filet de la jupe. En d'autres termes, la gorge est avantageusement moins profonde que le filetage est saillant.To obtain a better result, i.e. limit the deformations in the throat of the stopper during demolding, the height of the rib delimiting the throat and corresponding to the counter the latter is less than the radially measured height of the net of the skirt. In other words, the throat is advantageously less deep as the thread is protruding.
Le filet de la jupe s'approche de préférence à un millimètre au plus de la nervure circulaire. La distance séparant la fin du filet de la nervure circulaire est donc de préférence inférieure à un millimètre. Cette distance ne doit pas être nulle car sinon on retrouve les inconvénients de l'art antérieur, mais elle ne doit pas être trop grande pour favoriser une bonne déformation sans créer trop de contraintes.The skirt thread preferably approaches one millimeter at over the circular rib. The distance from the end of the thread to the circular rib is therefore preferably less than one millimeter. This distance must not be zero because otherwise we find the disadvantages of the prior art, but it should not be too large to favor a good deformation without creating too many constraints.
La présente invention propose aussi un moule pour la réalisation d'un bouchon à vis comportant un fond à partir duquel s'étend axialement une jupe munie d'un filet intérieur, une gorge sensiblement circulaire réalisée dans la jupe du côté du fond du bouchon, ainsi que des crans et/ou mortaises permettant d'éviter une rotation du bouchon lors du démoulage de ce dernier. Ce moule présente un fond de moule dont la paroi intérieure correspond à la surface extérieure de la jupe et du fond ainsi qu'un noyau destiné à être retiré par dévissage présentant une rainure en forme de filet ainsi qu'une gorge circulaire correspondant à la nervure circulaire du bouchon.The present invention also provides a mold for the realization of a screw cap having a bottom from which extends axially a skirt provided with an internal thread, a groove substantially circular made in the skirt on the bottom side of the cap, as well as notches and / or mortises to prevent rotation of the plug during demoulding of the latter. This mold has a mold base, the inner wall corresponds to the outer surface of the skirt and the bottom as well as a core intended to be removed by unscrewing having a net-like groove and a circular groove corresponding to the circular rib of the cap.
Selon l'invention, la rainure en forme de filet s'approche de la gorge circulaire sans déboucher dans celle-ci.According to the invention, the net-shaped groove approaches the circular groove without opening into it.
Ce moule permet la réalisation d'un bouchon tel que décrit ci-dessus.This mold allows the production of a plug as described above.
Avantageusement, la gorge circulaire est moins profonde que la rainure en forme de filet.Advantageously, the circular groove is less deep than the net-like groove.
La rainure en forme de filet s'approche de préférence à moins de un millimètre de la gorge circulaire. La distance entre cette rainure en forme de filet et la gorge circulaire est donc comprise entre zéro et un millimètre de préférence.The net-like groove is preferably approached unless one millimeter from the circular groove. The distance between this groove in form of thread and the circular groove is therefore between zero and one millimeter preferably.
De toute façon, l'invention sera bien comprise à l'aide de la
description qui suit, en référence au dessin schématique annexé
représentant à titre d'exemple non limitatif une forme de réalisation d'un
bouchon et d'un noyau de moule selon l'invention.
La figure 1 montre un bouchon à vis présentant un fond 2 à
partir duquel s'étend axialement une jupe 4 périphérique. La surface
intérieure de la jupe 4 présente un filet 6 permettant le vissage du
bouchon sur le col d'une bouteille ou similaire muni d'un filetage
correspondant. À proximité du fond 2 du bouchon, une nervure
périphérique est réalisée parallèlement à ce fond formant ainsi entre cette
nervure 8 et le fond 2 une gorge 10. Cette dernière est destinée à recevoir
un joint ou un obturateur (non représentés). De cette manière, il est
possible de parfaire l'étanchéité du bouchon et de le rendre étanche
notamment aux gaz et aux liquides. Un bouchon de ce type peut par
exemple être utilisé pour le bouchage de bouteilles contenant une boisson
gazeuse.Figure 1 shows a screw cap with a
Le filet 6 de la jupe 4 s'approche de la nervure périphérique 8
mais s'arrête de telle sorte qu'il reste un espace libre de largeur a entre ce
filet 6 et la nervure périphérique 8. La largeur a vaut par exemple 0,5 mm.The
À l'extrémité libre de la jupe 4, sur la face intérieure de celle-ci,
des crans 12 et des encoches 14 se succèdent sur toute la périphérie de la
jupe 4. Ces crans 12 et encoches 14 permettent de maintenir le bouchon
et d'empêcher celui-ci de tourner lors du démoulage du bouchon par
dévissage du noyau interne.At the free end of the skirt 4, on the inside of the latter,
La figure 2 représente le noyau 16 ainsi qu'une bague anti-rotation
18 d'un moule pour mouler le bouchon présenté sur la figure 1.Figure 2 shows the
La partie supérieure du noyau 16 correspond à la gorge 10 du
bouchon. Une gorge périphérique 20 correspond à la nervure périphérique
8 du bouchon. On retrouve aussi sur le noyau 16 une rainure en hélice 22
qui correspond au filet 6 de la jupe 4 du bouchon.The upper part of the
De même que sur le bouchon le filet 6 ne touche pas la nervure
périphérique 8, la rainure en hélice 22 du noyau ne débouche pas dans la
gorge périphérique 20 de ce noyau. La bague anti-rotation 18 entoure le
noyau 16. Elle présente des encoches 24 et des crans 26 qui
correspondent respectivement aux crans 12 et encoches 14 du bouchon.
Pour réaliser le bouchon de la figure 1, on place le noyau 16 et la bague
anti-rotation 18 dans un moule et de la manière synthétique est injectée.
On forme alors un bouchon tel que représenté sur la figure 1 avec un
fond, une jupe, un filet, une gorge et des crans et encoches.As on the cap the
Pour démouler ce bouchon, la bague anti-rotation est
maintenue fixe pour empêcher toute rotation du bouchon et le noyau est
dévissé. Lors du dévissage, l'extrémité du filet 6 se trouvant à proximité
de la nervure périphérique 8 va sortir de la rainure en hélice 22 du noyau
déformant ainsi localement le bouchon dans un sens qui favorise le
démoulage de la nervure périphérique 8. Au fur et à mesure du dévissage
du noyau 16, la déformation progresse périphériquement permettant ainsi
un démoulage progressif de la nervure périphérique 8.To unmold this plug, the anti-rotation ring is
held fixed to prevent rotation of the cap and the core is
unscrewed. When unscrewing, the end of the
Le démoulage est facilité lorsque la hauteur h2 du filet 6 est
supérieure à la hauteur h1 de la nervure périphérique 8 correspondant à la
contre-dépouille de la gorge 10. Ces hauteurs sont mesurées radialement
par rapport au bouchon et à sa jupe. Pour la nervure 8, cette hauteur est
mesurée entre le fond de la gorge 10 et le sommet de la nervure 8. Pour le
filet 6, cette hauteur h1 correspond à la différence entre le rayon interne
au sommet du filet 6 et le rayon interne de la jupe 4.Demoulding is facilitated when the height h2 of the
Si l'on considère le noyau 16, le démoulage est facilité si la
profondeur h2 de la rainure en hélice 22 est plus importante que la
profondeur h1 de la gorge 20 du noyau. Ces profondeurs correspondent
bien entendu aux hauteurs h1 et h2 décrites ci-dessus en référence au
bouchon.If we consider the
On obtient un bouchon dans lequel la nervure périphérique 8
présente un bord bien parallèle au fond 2. On retrouve ainsi en procédant
au dévissage du noyau lors du démoulage à un bord de gorge peu déformé
comparable à celui que l'on peut obtenir en utilisant un noyau éclipsable.
Le fait donc de ne pas prolonger le filet 6 jusqu'à la nervure périphérique 8
permet, avec des temps de démoulage courts et un moule relativement
simple, d'obtenir une gorge peu déformée pour le logement d'un joint ou
d'un obturateur.A plug is obtained in which the
Comme il va de soi, l'invention ne se limite pas à la forme de réalisation décrite ci-dessus à titre d'exemple non limitatif ; elle en embrasse au contraire toutes les variantes dans la cadre des revendications indiquées ci-après.It goes without saying that the invention is not limited to the form of embodiment described above by way of nonlimiting example; she in on the contrary embraces all variants within the framework of claims set out below.
Ainsi par exemple, les crans et encoches du bouchon et de la bague anti-rotation pourraient être remplacés par des tenons et mortaises, les tenons se trouvant par exemple au niveau de la bague anti-rotation et les mortaises au niveau du bouchon ou inversement.So for example, the notches and notches of the cap and the anti-rotation ring could be replaced by tenons and mortises, the pins being for example at the level of the anti-rotation ring and mortises at the plug or vice versa.
Le bouchon représenté ne comporte qu'un seul filet. On ne sortirait du cadre de l'invention si le bouchon présentait plusieurs filets.The cap shown has only one thread. Onne would depart from the scope of the invention if the plug had several threads.
Claims (6)
- Screw cap comprising a base (2) from which extends axially a skirt (4) having an inside thread (6), a substantially circular rib (8) defining a groove (10) in the skirt (4) towards the base of the cap, as well as notches (12) and/or mortises making it possible to avoid rotation of the cap during demoulding of the latter,
characterised in that the inside thread (6) of the skirt (4) approaches the rib 8 without however going into it. - Screw cap according to claim 1, characterised in that the height (h1) of the rib (8) defining the groove (10) and corresponding to the undercut of the latter is less than the height (h2) measured radially of the thread (6) of the skirt.
- Screw cap according to one of claims 1 or 2,
characterised in that the thread (6) of the skirt approaches at most 1 millimetre to the circular rib (8). - Mould for producing a screw cap comprising a base (2) from which extends axially a skirt (4) having an inside thread (6), a substantially circular groove (10) in the skirt (4) near the base of the cap,
as well as notches (12) and/or mortises making it possible to avoid rotation of the cap during demoulding of the latter, this mould has a mould base the inside wall of which corresponds to the outer surface of the skirt (4) and base (2) as well as a core (16) designed to be withdrawn by unscrewing having a channel (22) in the form of a thread as well as a circular groove (20) corresponding to the circular rib (8) of the cap,
characterised in that the channel (22) in the form of a thread approaches the circular groove (20) without however going into it. - Mould according to claim 4, characterised in that the circular groove (20) is less deep that the channel (22) in the form of a thread.
- Mould according to one of claims 4 or 5,
characterised in that the channel (22) in the form of a thread approaches to less than 1 millimetre from the circular groove (20)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9806266A FR2778641B1 (en) | 1998-05-13 | 1998-05-13 | SCREW PLUG HAVING A THROAT FOR RECEIVING A JOINT AND MOLD FOR MAKING SUCH A PLUG |
| FR9806266 | 1998-05-13 | ||
| PCT/FR1999/001060 WO1999058410A1 (en) | 1998-05-13 | 1999-05-04 | Screw top with a groove for receiving a joint and mould for producing such a top |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1077882A1 EP1077882A1 (en) | 2001-02-28 |
| EP1077882B1 true EP1077882B1 (en) | 2003-07-23 |
Family
ID=9526470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99916989A Expired - Lifetime EP1077882B1 (en) | 1998-05-13 | 1999-05-04 | Screw top with a groove for receiving a joint and mould for producing such a top |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1077882B1 (en) |
| AT (1) | ATE245574T1 (en) |
| AU (1) | AU3527999A (en) |
| DE (1) | DE69909778D1 (en) |
| FR (1) | FR2778641B1 (en) |
| MX (1) | MXPA00011142A (en) |
| WO (1) | WO1999058410A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU8466382A (en) * | 1981-06-08 | 1982-12-16 | Ethyl Molded Products Company | Tamper-indicating closure |
| GB2161797B (en) * | 1984-07-18 | 1987-08-12 | Grace W R & Co | Pre-threaded container closure |
| FR2619552B1 (en) * | 1987-08-18 | 1990-02-02 | Astra Plastique | SCREW CAP WITH A SECURITY BELT, OF THE TYPE UNMOLDED BY UNSCREWING, AND MOLD USED FOR THE MANUFACTURE OF THIS CAP |
| BR9206223A (en) * | 1991-06-29 | 1994-11-22 | Alcoa Deutschland Gmbh | Plastic lid for containers |
| US5281385A (en) * | 1992-10-21 | 1994-01-25 | Sunbeam Plastics Corporation | Injection molding system for threaded tamper indicating closures |
-
1998
- 1998-05-13 FR FR9806266A patent/FR2778641B1/en not_active Expired - Fee Related
-
1999
- 1999-05-04 AU AU35279/99A patent/AU3527999A/en not_active Abandoned
- 1999-05-04 AT AT99916989T patent/ATE245574T1/en not_active IP Right Cessation
- 1999-05-04 DE DE69909778T patent/DE69909778D1/en not_active Expired - Lifetime
- 1999-05-04 EP EP99916989A patent/EP1077882B1/en not_active Expired - Lifetime
- 1999-05-04 WO PCT/FR1999/001060 patent/WO1999058410A1/en active IP Right Grant
- 1999-05-04 MX MXPA00011142A patent/MXPA00011142A/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| ATE245574T1 (en) | 2003-08-15 |
| AU3527999A (en) | 1999-11-29 |
| EP1077882A1 (en) | 2001-02-28 |
| WO1999058410A1 (en) | 1999-11-18 |
| FR2778641A1 (en) | 1999-11-19 |
| FR2778641B1 (en) | 2000-06-16 |
| DE69909778D1 (en) | 2003-08-28 |
| MXPA00011142A (en) | 2004-10-14 |
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