EP0370272A1 - Screw closure for bottles having a deaeration device - Google Patents

Screw closure for bottles having a deaeration device Download PDF

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Publication number
EP0370272A1
EP0370272A1 EP89120148A EP89120148A EP0370272A1 EP 0370272 A1 EP0370272 A1 EP 0370272A1 EP 89120148 A EP89120148 A EP 89120148A EP 89120148 A EP89120148 A EP 89120148A EP 0370272 A1 EP0370272 A1 EP 0370272A1
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EP
European Patent Office
Prior art keywords
cap
segment
bead
sealing washer
screw
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.)
Granted
Application number
EP89120148A
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German (de)
French (fr)
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EP0370272B1 (en
Inventor
Günter Jakob Krautkrämer
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Jacob Berg GmbH and Co KG
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Jacob Berg GmbH and Co KG
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Publication of EP0370272A1 publication Critical patent/EP0370272A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D51/00—Closures not otherwise provided for
    • B65D51/16—Closures not otherwise provided for with means for venting air or gas
    • B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
    • B65D51/1661—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element by means of a passage for the escape of gas between the closure and the lip of the container mouth
    • 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
    • B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
    • B65D41/34—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt
    • B65D41/3423—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with flexible tabs, or elements rotated from a non-engaging to an engaging position, formed on the tamper element or in the closure skirt
    • B65D41/3428—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with flexible tabs, or elements rotated from a non-engaging to an engaging position, formed on the tamper element or in the closure skirt the tamper element being integrally connected to the closure by means of bridges

Definitions

  • the present invention relates to a screw cap for pressurized bottles, consisting of a cap with a cap bottom and a cap jacket with an internal thread
  • screw caps are usually made of plastic and a circumferential and inwardly projecting bead at the transition between the cap bottom and have the cap jacket and wherein on the inside of the cap base and the bead a sealing disc movable against the cap rests.
  • This bead is e.g. Essentially rectangular in cross-section and its inwardly projecting edge is approximately diagonally opposite the upper outer edge of the mouth of a bottle when a screw cap is firmly screwed onto a bottle.
  • Such a closure is known from EP-A-0055916.
  • a constriction is formed between the projecting edge of the bead and the upper outer edge of the mouth of the bottle, so that an intermediate sealing washer is pressed particularly firmly in this area with a high specific surface pressure and thus closes the bottle pressure-tight. For this reason, bottles with carbonated beverages in particular are provided with such screw caps.
  • the present invention is therefore based on the object of redesigning the closure known from EP-A-0055916 in such a way that it is still pressure-tight for the usual uses, but the maximum pressure up to which the closure remains tight is limited to a value that is significantly below the pressure at which a Bottle explodes.
  • the bead which runs in the manner of a circular ring in the corner formed between the cap base and cap shell, does not extend over the entire inner circumference of the cap base or cap shell, but is over a certain angular range, i.e. H. interrupted or omitted in a segment of the ring.
  • the high contact pressure along the opposite edge line of the bead and the closure edge of the bottle is then missing in this segment.
  • the sealing washers used have sufficient rigidity so that they still lie pressure-tight against the edge of the closure edge of the bottle even over the interruption segment. If, however, the pressure in the bottle becomes too great, the sealing disc yields in the area of this segment and presses into the area of the transition between the cap base and the cap jacket, in which the said bead is otherwise arranged in the area of the remaining circumference.
  • An overpressure can escape between the sealing washer and the closure edge of the bottle, this being additionally facilitated by the fact that in the preferred embodiment of the invention the thread of the closure has ventilation channels running transversely to the threads. Likewise, the thread on the closure edge of the bottle can also have ventilation channels running transversely to the thread.
  • segment-like interruption of the bead should extend over an angular range of at least 15 ° for the desired function of the new screw closure in the sealing disks that are usually used.
  • Embodiments of the screw closure are preferred in which the segment-like interruption extends over an angle of 30 ° or 45 °, the choice also depending on the type of sealing washer used and the desired maximum pressure. If the sealing washer is relatively thin and at the same time very flexible and elastic, the bead will usually only be interrupted over a smaller angular range, which may also fall below the stated value of 15 ° in the case of very thin and very elastic sealing washers.
  • interruptions can optionally be provided along the circumference of the bead. From the point of view of proper functioning, it appears most sensible if the interruption segments each extend over the same angular ranges and are also spaced apart from one another by the same angle.
  • the effect of the new closure can, however, also be achieved in other ways, even if the bead is not interrupted or if another screw closure, for example made of metal, is used, which the pressure tightness by a more or less flat pressure of the sealing washer on the edge of the closure Bottle reached.
  • a closure thus has, as necessary and known components, a cap with a cap base and a cap jacket with an internal thread, and a sealing washer.
  • the sealing disk has at least one recess on its top side facing the cap base and optionally also the cap jacket in its area of contact with the mouth edge of the bottle.
  • the sealing disc When the closure is screwed on in a pressure-tight manner, the sealing disc is in its outer region between the closure edge of the bottle and the cap bottom or the cap man tel pressed together. If the sealing washer has a recess or recess on its upper side, which faces the cap base or the cap jacket, it is not or less compressed in this area, in which it is thinner because of this recess than in the rest of the sealing area that here too, at a correspondingly high pressure in the bottle, the sealing disk is lifted in the region of the recess from the mouth of the bottle, so that the pressure can escape. In this case, too, additional ventilation channels can be provided in the thread area.
  • the sealing washer must of course not be designed as a full circular disk, but it would suffice in any case if a seal, for. B. is arranged in the form of a circular ring in the region of the closure edge of the bottle in the cap.
  • the angular range along which a recess is to extend in the surface of the sealing washer is somewhat smaller than the angular range provided for the segment-like interruptions of a bead, but should be at least 10 ° according to practical experience. In the preferred embodiment, such a recess extends in the region of the outer edge of the sealing washer over an angular range of 15 to 35 °.
  • the depth of the recess corresponds to at least half the thickness of the sealing washer.
  • the sealing washer is in the case of a more or less linear contact pressure such. B. often when using the bead described above significantly less than half of their other thickness compressed, so that even if the sealing washer in the area of the recess is only half as thick as in the rest of the area or even thinner, there is still sufficient contact pressure for a seal against a low and tolerable excess pressure consists. At the same time, however, the sealing washer can yield in this thinner area if the pressure in the bottle increases noticeably.
  • An embodiment of the closure is also expedient in which a plurality of recesses are provided along the circumferential region of a sealing washer, and it may be advantageous if these recesses are of the same type, ie. H. have the same depth and extend over the same angular ranges and are also arranged at the same angular distances relative to one another.
  • the screw cap shown in Figure 1 consists of a cap 1, which in turn consists essentially of a cap base 2 and a cap jacket 3 provided with an internal thread 7. There is also an at the bottom of the clasp Arranged circlip 10, which is damaged or tears off the cap 1 when the screw cap is released from a bottle for the first time.
  • the sectional view in Figure 1 is chosen so that on the left side the cross section of a bead 5 can be seen as a right-angled projection, while on the right side an interruption segment is shown in section, so that in this area the sealing washer 9 is not from the edge the bead 5 is pressed downwards and inwards.
  • the sealing disk 9 lies essentially only on the outer sealing edge of the mouth of the bottle due to its rigidity.
  • the specific surface pressure is of course lower here than along the opposite edges of the bead and the edge of the mouth. Nevertheless, sufficient tightness is achieved here, too, because the segment only extends over a small angular range and the sealing washer still lies more firmly in this area than if the bead 5 were completely missing.
  • the sealing washer 11 is not or less compressed in the area of the segment 6 than along the edge of the bead 5, so that it can give way in this area at a correspondingly high pressure in the bottle and allow excessive pressure to escape from the bottle, whereby also the thread 7 has ventilation channels 8 which run transversely to the threads and so facilitate the escape of escaping gases or liquids.
  • the sealing washer 9 can also have a somewhat larger diameter and in some cases also rest against the inner wall of the cap casing 3, so that the seal in the region of the segment 6 can take place not only along the upper surface of the closure edge but also from the outside thereof.
  • FIG. 2 For the sake of clarity, a similar closure cross-section is again shown in FIG. 2, in which the sealing washer 9 has been omitted, so that the cross-section of the bead 5 can be seen clearly on the right-hand side, which, depending on the point of view, can be found in a thickened cap bottom or cap jacket wall expresses and forms a protruding corner, which causes the increased linear contact pressure.
  • a segment without a bead is again shown cut, in which the cap wall 3 and the cap base 2 essentially maintain their other wall thickness and merge into one another with a slightly rounded 90 ° bend.
  • FIG. 3 shows a horizontal section through a cap 1 in the area of the bead 5.
  • the greater wall thickness of the cap jacket 3 in the area of the bead which has its normal dimension only in the area of the interruption segment 6.
  • a corrugation 12 can be seen, which is intended to facilitate screwing and screwing on the closure and is also indicated in FIGS. 1 and 2 by the outer vertical lines on the cap casing 3.
  • the upper side 11 of the sealing disk 9 can also have a recess in a partial area of the bead 5, so that accordingly the contact pressure of the sealing disk 11 on the closure edge of a bottle is also lower in this area is than in the rest of the area and overpressure can thus escape.
  • Figure 5 shows the top view of a sealing washer 9 with a recess 6 'on its top facing the cap bottom.
  • this recess 6 ' can be seen in a cross-sectional view of the sealing washer 9.
  • the sealing washer 9 remains practically unchanged on its sealing underside, but it lies in the area of the recess 6 'essentially only because of its own rigidity at the sealing edge of the mouth of a bottle, while in the remaining area the projecting edge of a bead the material of the sealing washer 9 together and presses against the outer edge of the mouth of the bottle.
  • the sealing underside lifts off in the region of the recess 6 'from the mouth of the bottle, thus allowing the pressure to escape from the bottle until it is reduced so much that the sealing washer resumes due to its elasticity creates the edge of the rim of the mouth.

Abstract

Die Erfindung betrifft einen Schraubverschluß aus Kunststoff für unter Druck stehende Flaschen, bestehend aus einer Kappe (1) mit einem Kappenboden (2) und einem im wesentlichen zylindrischen Kappenmantel (3) mit Innengewinde (7), einer umlaufenden und nach innen vorspringenden Sicke (5) am Übergang zwischen dem Kappenboden (2) und dem Kappenmantel (3), wobei eine gegen die Kappe bewegliche Dichtungsscheibe (9) an der Innenseite des Kappenbodens (2) und der vorspringenden Sicke. (5) anliegt. Um bei einem solchen druckdichten Verschluß den maximalen Druck, bis zu welchem der Verschluß dicht bleibt, auf einen Wert zu begrenzen, der deutlich unterhalb des Druckes liegt, bei welchem eine Flasche explodiert, wird erfindungsgemäß vorgeschlagen, daß die Sicke eine segmentartige Unterbrechung aufweist.The invention relates to a screw cap made of plastic for pressurized bottles, comprising a cap (1) with a cap base (2) and an essentially cylindrical cap jacket (3) with an internal thread (7), a circumferential and inwardly projecting bead (5 ) at the transition between the cap base (2) and the cap jacket (3), a sealing washer (9) movable against the cap on the inside of the cap base (2) and the projecting bead. (5) is present. In order to limit the maximum pressure up to which the closure remains tight in such a pressure-tight closure to a value which is significantly below the pressure at which a bottle explodes, it is proposed according to the invention that the bead has a segment-like interruption.

Description

Die vorliegende Erfindung bezieht sich auf einen Schraubver­schluß für unter Druck stehende Flaschen, bestehend aus einer Kappe mit einem Kappenboden und einem Kappenmantel mit Innen­gewinde, wobei derartige Schraubverschlüsse in der Regel aus Kunststoff bestehen und eine umlaufende und nach innen vorsprin­gende Sicke am Übergang zwischen dem Kappenboden und dem Kappen­mantel aufweisen und wobei auf der Innenseite des Kappenbodens und der Sicke eine gegen die Kappe bewegliche Dichtungsscheibe anliegt. Diese Sicke ist z.B. im Querschnitt im wesentlichen rechteckig und ihre nach innen vor­stehende Kante liegt bei einem fest auf eine Flasche aufge­schraubten Schraubverschluß in etwa diagonal der oberen äuße­ren Kante des Mündungsrandes einer Flasche gegenüber. Ein derartiger Verschluß ist bekannt aus der EP-A-0055916. Dabei wird zwischen der vorspringenden Kante der Sicke und der oberen äußeren Kante des Mündungsrandes der Flasche eine Engstelle gebildet, so daß eine dazwischenliegende Dichtungsscheibe in diesem Bereich besonders fest mit einem hohen spezifischen Flä­chendruck angepreßt wird und so die Flasche druckdicht ver­schließt. Deshalb werden insbesondere Flaschen mit kohlensäure­haltigen Getränken mit derartigen Schraubverschlüssen versehen.The present invention relates to a screw cap for pressurized bottles, consisting of a cap with a cap bottom and a cap jacket with an internal thread, such screw caps are usually made of plastic and a circumferential and inwardly projecting bead at the transition between the cap bottom and have the cap jacket and wherein on the inside of the cap base and the bead a sealing disc movable against the cap rests. This bead is e.g. Essentially rectangular in cross-section and its inwardly projecting edge is approximately diagonally opposite the upper outer edge of the mouth of a bottle when a screw cap is firmly screwed onto a bottle. Such a closure is known from EP-A-0055916. A constriction is formed between the projecting edge of the bead and the upper outer edge of the mouth of the bottle, so that an intermediate sealing washer is pressed particularly firmly in this area with a high specific surface pressure and thus closes the bottle pressure-tight. For this reason, bottles with carbonated beverages in particular are provided with such screw caps.

Ein Nachteil dieser druckdichten Schraubverschlüsse liegt je­doch darin, daß sich in Fällen, in denen sich ungewollt ein zu hoher Druck im Flascheninneren Aufbaut, die Flasche explodie­ren kann. Derartige Fälle sind in der Vergangenheit mehrfach bekannt geworden, wobei einzelne Personen teilweise erhebliche Verletzungen durch explodierende Flaschen davongetragen haben.A disadvantage of these pressure-tight screw caps, however, lies in the fact that the bottle can explode in cases where excessive pressure builds up inside the bottle. Such cases have become known several times in the past, with some people having sustained considerable injuries from exploding bottles.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, den aus der EP-A-0055916 bekannten Verschluß derart umzugestal­ten, daß er zwar nach wie vor für die üblichen Verwendungs­zwecke druckdicht ist, wobei jedoch der maximale Druck, bis zu welchem der Verschluß dicht bleibt, auf einen Wert begrenzt ist, der deutlich unterhalb des Druckes liegt, bei welchem eine Flasche explodiert.The present invention is therefore based on the object of redesigning the closure known from EP-A-0055916 in such a way that it is still pressure-tight for the usual uses, but the maximum pressure up to which the closure remains tight is limited to a value that is significantly below the pressure at which a Bottle explodes.

Diese Aufgabe wird dadurch gelöst, daß die Sicke eine segment­artige Unterbrechung aufweist.This object is achieved in that the bead has a segment-like interruption.

Die Sicke, welche nach Art eines Kreisringes in der zwischen Kappenboden und Kappenmantel gebil­deten Ecke umläuft, erstreckt sich also nicht über den ganzen inneren Umfang des Kappenbodens bzw. des Kappenmantels, sondern ist über einen bestimmten Winkelbereich, d. h. in einem Segment des Ringes unterbrochen bzw. fortgelassen. In diesem Segment fehlt dann der hohe Anpreßdruck entlang der gegenüberliegenden Kantenlinie der Sicke und des Verschlußrandes der Flasche.The bead, which runs in the manner of a circular ring in the corner formed between the cap base and cap shell, does not extend over the entire inner circumference of the cap base or cap shell, but is over a certain angular range, i.e. H. interrupted or omitted in a segment of the ring. The high contact pressure along the opposite edge line of the bead and the closure edge of the bottle is then missing in this segment.

Dabei haben die verwendeten Dichtungsscheiben eine ausreichende Steifigkeit, so daß sie auch über das Unter­brechungssegment hinweg immer noch druckdicht an der Kante des Verschlußrandes der Flasche anliegen. Wird allerdings der Druck in der Flasche zu groß, so gibt die Dich­tungsscheibe im Bereich dieses Segmentes nach und drückt sich in den Bereich des Überganges zwischen Kappenboden und Kappen­mantel, in dem ansonsten im Bereich des übrigen Umfanges die besagte Sicke angeordnet ist. Dabei kann ein Überdruck zwischen Dichtungsscheibe und dem Verschlußrand der Flasche entweichen, wobei dies zusätzlich noch dadurch erleichtert wird, daß in der bevorzugten Ausführungsform der Erfindung das Gewinde des Ver­schlusses quer zu den Gewindegängen verlaufende Belüftungskanä­le aufweist. Ebenso kann auch das Gewinde am Verschlußrand der Flasche quer zum Gewinde verlaufende Belüftungskanäle aufweisen.The sealing washers used have sufficient rigidity so that they still lie pressure-tight against the edge of the closure edge of the bottle even over the interruption segment. If, however, the pressure in the bottle becomes too great, the sealing disc yields in the area of this segment and presses into the area of the transition between the cap base and the cap jacket, in which the said bead is otherwise arranged in the area of the remaining circumference. An overpressure can escape between the sealing washer and the closure edge of the bottle, this being additionally facilitated by the fact that in the preferred embodiment of the invention the thread of the closure has ventilation channels running transversely to the threads. Likewise, the thread on the closure edge of the bottle can also have ventilation channels running transversely to the thread.

In der Praxis hat es sich herausgestellt, daß für die gewünsch­te Funktion des neuen Schraubverschlusses bei den üblicherweise verwendeten Dichtungsscheiben die segmentartige Unterbrechung der Sicke sich über einen Winkelbereich von mindestens 15° erstrecken sollte.In practice, it has been found that the segment-like interruption of the bead should extend over an angular range of at least 15 ° for the desired function of the new screw closure in the sealing disks that are usually used.

Andererseits sollte sie sich jedoch auch über einen Winkelbe­reich erstrecken, der kleiner als 60° ist, da ansonsten die Dichtigkeit des Verschlusses unter normalen Bedingungen nicht sichergestellt werden kann.On the other hand, it should also extend over an angular range that is less than 60 °, otherwise the Tightness of the closure cannot be ensured under normal conditions.

Bevorzugt sind Ausführungsformen des Schraubverschlusses, bei welchen sich die segmentartige Unterbrechung über einen Winkel von 30° oder 45° erstreckt, wobei die Wahl im einzelnen auch von der Art der verwendeten Dichtungsscheibe und vom gewünsch­ten Höchstdruck abhängt. Ist die Dichtungsscheibe relativ dünn und gleichzeitig sehr biegsam und elastisch, so wird man im Regelfall die Sicke nur über einen kleineren Winkelbereich unterbrechen, der unter Umständen auch bei sehr dünnen und sehr elastischen Dichtungsscheiben den genannten Wert von 15° unterschreiten kann.Embodiments of the screw closure are preferred in which the segment-like interruption extends over an angle of 30 ° or 45 °, the choice also depending on the type of sealing washer used and the desired maximum pressure. If the sealing washer is relatively thin and at the same time very flexible and elastic, the bead will usually only be interrupted over a smaller angular range, which may also fall below the stated value of 15 ° in the case of very thin and very elastic sealing washers.

Unabhängig von dem konkret gewählten Winkelbereich kann man wahlweise auch mehrere derartige Unterbrechungen entlang des Umfangs der Sicke vor­sehen. Dabei erscheint es unter dem Gesichtspunkt einer ordnungsgemäßen Funktion am sinnvollsten, wenn die Unterbrechungs­segmente sich jeweils über gleiche Winkelbereiche erstrecken und auch voneinander um jeweils gleiche Winkel beabstandet sind.Regardless of the specifically selected angular range, several such interruptions can optionally be provided along the circumference of the bead. From the point of view of proper functioning, it appears most sensible if the interruption segments each extend over the same angular ranges and are also spaced apart from one another by the same angle.

Die Wirkung des neuen Verschlusses läßt sich jedoch auch auf andere Weise erzielen, selbst wenn die Sicke nicht unterbrochen wird oder wenn ein anderer Schraubverschluß, beispielsweise aus Metall, verwendet wird, welcher die Druckdichtigkeit durch eine mehr oder weniger flächige Anpressung der Dichtungsschei­be an den Verschlußrand der Flasche erreicht. Ein solcher Ver­schluß weist also als notwendige und bekannte Bestandteile eine Kappe mit Kappenboden und einem Kappenmantel mit Innenge­winde sowie eine Dichtungsscheibe auf. Statt einer Aussparung an einer Sicke wird zur Lösung der erfindungsgemäßen Aufgabe in einem solchen Fall vorgeschlagen, daß die Dichtungsscheibe auf ihrer dem Kappenboden und gegebenenfalls auch dem Kappen­mantel zugewandten Oberseite in ihrem Berührungsbereich mit dem Mündungsrand der Flasche mindestens eine Ausnehmung auf­weist. Die Dichtungsscheibe wird, wenn der Verschluß druckdicht aufgeschraubt ist, in ihrem äußeren Bereich zwischen dem Ver­schlußrand der Flasche und dem Kappenboden bzw. dem Kappenman­ tel zusammengepreßt. Sofern die Dichtungsscheibe auf ihrer Ober­seite, welche dem Kappenboden bzw. dem Kappenmantel zugewendet ist, eine Ausnehmung oder Vertiefung aufweist, wird sie in die­sem Bereich, in dem sie wegen dieser Ausnehmung dünner ist als in dem übrigen Abdichtungsbereich,nicht oder weniger stark zusammengepreßt, so daß auch hier bei entsprechend hohem Druck in der Flasche die Dichtungsscheibe in dem Bereich der Ausnehmung vom Mün­dungsrand der Flasche abgehoben wird, so daß der Druck entwei­chen kann. Auch in diesem Fall können wieder zusätzliche Belüf­tungskanäle im Gewindebereich vorgesehen sein.The effect of the new closure can, however, also be achieved in other ways, even if the bead is not interrupted or if another screw closure, for example made of metal, is used, which the pressure tightness by a more or less flat pressure of the sealing washer on the edge of the closure Bottle reached. Such a closure thus has, as necessary and known components, a cap with a cap base and a cap jacket with an internal thread, and a sealing washer. Instead of a recess on a bead, it is proposed in such a case to achieve the object according to the invention that the sealing disk has at least one recess on its top side facing the cap base and optionally also the cap jacket in its area of contact with the mouth edge of the bottle. When the closure is screwed on in a pressure-tight manner, the sealing disc is in its outer region between the closure edge of the bottle and the cap bottom or the cap man tel pressed together. If the sealing washer has a recess or recess on its upper side, which faces the cap base or the cap jacket, it is not or less compressed in this area, in which it is thinner because of this recess than in the rest of the sealing area that here too, at a correspondingly high pressure in the bottle, the sealing disk is lifted in the region of the recess from the mouth of the bottle, so that the pressure can escape. In this case, too, additional ventilation channels can be provided in the thread area.

Das Anbringen einer Ausnehmung auf der Oberseite der Dichtungs­scheibe bewirkt also in ähnlicher Weise wie die segmentartige Unterbrechung der Sicke an einem druckdichten Verschluß, daß in der druckdichten Verbindung zwischen Verschluß und Flasche eine Schwachstelle erzeugt wird, durch die ein zu großer Über­druck entweichen kann.The provision of a recess on the top of the sealing washer, in a manner similar to the segment-like interruption of the bead on a pressure-tight closure, causes a weak point to be created in the pressure-tight connection between the closure and bottle, through which excess pressure can escape.

Die Dichtungsscheibe muß selbstverständlich nicht als volle Kreisscheibe ausgebildet sein, sondern es würde in jedem Fall genügen, wenn eine Dichtung, z. B. in Form eines Kreisringes im Bereich des Verschlußrandes der Flasche in der Kappe ange­ordnet ist.The sealing washer must of course not be designed as a full circular disk, but it would suffice in any case if a seal, for. B. is arranged in the form of a circular ring in the region of the closure edge of the bottle in the cap.

Der Winkelbereich, entlang dessen sich eine Ausnehmung in der Oberfläche der Dichtungsscheibe erstrecken soll, ist etwas kleiner als der für die segmentartigen Unterbrechungen einer Sicke vorgesehene Winkelbereich, sollte jedoch nach praktischen Erfahrungen mindestens 10° betragen. In der bevorzugten Aus­führungsform erstreckt sich eine solche Ausnehmung im Bereich des äußeren Randes der Dichtungsscheibe über einen Winkelbe­reich von 15 bis 35°.The angular range along which a recess is to extend in the surface of the sealing washer is somewhat smaller than the angular range provided for the segment-like interruptions of a bead, but should be at least 10 ° according to practical experience. In the preferred embodiment, such a recess extends in the region of the outer edge of the sealing washer over an angular range of 15 to 35 °.

Dabei erscheint es für die Funktion des Verschlusses als vor­teilhaft, wenn die Tiefe der Ausnehmung mindestens der Hälfte der Dicke der Dichtungsscheibe entspricht. Die Dichtungsscheibe wird im Fall eines mehr oder weniger linearen Anpreßdruckes wie z. B. bei der Verwendung der oben beschriebenen Sicke oft auf deutlich weniger als die Hälfte ihrer sonstigen Dicke zusammen­gepreßt, so daß auch dann, wenn die Dichtungsscheibe im Be­reich der Ausnehmung nur noch halb so dick wie im übrigen Be­reich oder noch dünner ist, noch ein ausreichender Anpreßdruck für eine Dichtigkeit gegenüber einem geringen und zu tolerieren­den Überdruck besteht. Gleichzeitig kann die Dichtungsscheibe jedoch in diesem dünneren Bereich nachgeben, wenn der Druck in der Flasche merklich ansteigt.It appears to be advantageous for the function of the closure if the depth of the recess corresponds to at least half the thickness of the sealing washer. The sealing washer is in the case of a more or less linear contact pressure such. B. often when using the bead described above significantly less than half of their other thickness compressed, so that even if the sealing washer in the area of the recess is only half as thick as in the rest of the area or even thinner, there is still sufficient contact pressure for a seal against a low and tolerable excess pressure consists. At the same time, however, the sealing washer can yield in this thinner area if the pressure in the bottle increases noticeably.

Zweckmäßig ist dabei auch eine Ausführungsform des Verschlus­ses, bei welchem mehrere Ausnehmungen entlang des Umfangsbe­reiches einer Dichtungsscheibe vorgesehen sind, wobei es vor­teilhaft sein kann, wenn diese Ausnehmungen gleichartig sind, d. h. die gleiche Tiefe haben und sich über jeweils gleiche Winkelbereiche erstrecken und auch unter gleichen Winkelabstän­den relativ zueinander angeordnet sind.An embodiment of the closure is also expedient in which a plurality of recesses are provided along the circumferential region of a sealing washer, and it may be advantageous if these recesses are of the same type, ie. H. have the same depth and extend over the same angular ranges and are also arranged at the same angular distances relative to one another.

Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der vor­liegenden Erfindung werden deutlich anhand der Beschreibung einer bevorzugten Ausführungsform und der dazugehörigen Figuren.Further advantages, features and possible uses of the present invention will become clear from the description of a preferred embodiment and the associated figures.

Es zeigen:

  • Figur 1 einen Querschnitt durch einen Verschluß mit Sicke und Unterbrechungssegment,
  • Figur 2 eine Figur 1 entsprechende Darstellung ohne Dichtungs­scheibe,
  • Figur 3 eine Darstellung der Sicke mit Unterbrechungssegment bei der Sicht in das Innere einer Verschlußkappe.
  • Figur 4 eine Draufsicht auf eine Dichtungsscheibe mit einer segmentartigen Ausnehmung und
  • Figur 5 in vergrößertem Maßstab einen Querschnitt entlang der Linie VV in Figur 4.
Show it:
  • FIG. 1 shows a cross section through a closure with a bead and interruption segment,
  • FIG. 2 shows a representation corresponding to FIG. 1 without a sealing washer,
  • Figure 3 is an illustration of the bead with interruption segment when looking into the interior of a cap.
  • Figure 4 is a plan view of a sealing washer with a segment-like recess and
  • 5 shows a cross section along the line VV in FIG. 4 on an enlarged scale.

Der in Figur 1 dargestellte Schraubverschluß besteht aus einer Kappe 1, welche ihrerseits im wesentlichen aus einem Kappenbo­den 2 und einem mit Innengewinde 7 versehenen Kappenmantel 3 besteht. Außerdem ist am unteren Rand des Verschlusses noch ein Sicherungsring 10 angeordnet, welcher beschädigt wird oder von der Kappe 1 abreißt, wenn der Schraubverschluß erstmalig von einer Flasche gelöst wird.The screw cap shown in Figure 1 consists of a cap 1, which in turn consists essentially of a cap base 2 and a cap jacket 3 provided with an internal thread 7. There is also an at the bottom of the clasp Arranged circlip 10, which is damaged or tears off the cap 1 when the screw cap is released from a bottle for the first time.

Die Schnittdarstellung in Figur 1 ist so gewählt, daß auf der linken Seite der Querschnitt einer Sicke 5 als rechtwinkliger Vorsprung zu erkennen ist, während auf der rechten Seite ein Unterbrechungssegment im Schnitt dargestellt ist, so daß in diesem Bereich die Dichtungsscheibe 9 nicht von der Kante der Sicke 5 nach unten und innen gedrückt wird.The sectional view in Figure 1 is chosen so that on the left side the cross section of a bead 5 can be seen as a right-angled projection, while on the right side an interruption segment is shown in section, so that in this area the sealing washer 9 is not from the edge the bead 5 is pressed downwards and inwards.

Wird ein solcher Verschluß auf den Mündungsrand einer Flasche aufgeschraubt, so tritt zwischen der Kante der Sicke 5 und der dieser Kante gegenüberliegenden oberen, äußeren Kante des Mün­dungsrandes der Flasche ein im wesentlichen nur entlang der Kantenlinien wirkender Anpreßdruck auf, der relativ hoch ist, weil bei vorgegebener Kraft, mit welcher der Verschluß aufge­schraubt wird, die Druckfläche relativ klein ist, wie man auch in der in Bezug genommenen EP-A-0055916 erkennt.If such a closure is screwed onto the mouth edge of a bottle, then a contact pressure which acts essentially only along the edge lines occurs between the edge of the bead 5 and the upper outer edge of the mouth edge of the bottle opposite this edge, which is relatively high because at Given the force with which the closure is screwed on, the pressure area is relatively small, as can also be seen in the referenced EP-A-0055916.

In dem Unterbrechungssegment 6 jedoch, wo die Sicke 5 fehlt, liegt die Dichtungsscheibe 9 im wesentlichen nur aufgrund ihrer Steifigkeit an der äußeren Dichtungskante des Mündungs­randes der Flasche an. Der spezifische Flächendruck ist hier selbstverständlich geringer als entlang der gegenüberliegenden Kanten der Sicke und des Mündungsrandes. Dennoch wird auch hier eine ausreichende Dichtigkeit erzielt, da daß das Segment sich nur über einen kleinen Winkelbereich erstreckt und die Dichtungsscheibe auch in diesem Bereich immer noch fester an­liegt, als wenn die Sicke 5 vollständig fehlen würde.In the interruption segment 6, however, where the bead 5 is missing, the sealing disk 9 lies essentially only on the outer sealing edge of the mouth of the bottle due to its rigidity. The specific surface pressure is of course lower here than along the opposite edges of the bead and the edge of the mouth. Nevertheless, sufficient tightness is achieved here, too, because the segment only extends over a small angular range and the sealing washer still lies more firmly in this area than if the bead 5 were completely missing.

Die Dichtungsscheibe 11 wird jedoch im Bereich des Segmentes 6 nicht oder weniger stark zusammengepreßt als entlang der Kante der Sicke 5, so daß sie bei entsprechend hohem Druck in der Flasche in die­sem Bereich nachgeben kann und einen zu hohen Überdruck aus der Flasche entweichen läßt, wobei auch das Gewinde 7 Entlüftungs­kanäle 8 aufweist, welche quer zu den Gewindegängen verlaufen und so das Entweichen austretender Gase oder Flüssigkeiten er­leichtern.However, the sealing washer 11 is not or less compressed in the area of the segment 6 than along the edge of the bead 5, so that it can give way in this area at a correspondingly high pressure in the bottle and allow excessive pressure to escape from the bottle, whereby also the thread 7 has ventilation channels 8 which run transversely to the threads and so facilitate the escape of escaping gases or liquids.

Selbstverständlich kann die Dichtungsscheibe 9 auch einen etwas größeren Durchmesser haben und teilweise auch entlang der inne­ren Wand des Kappenmantels 3 anliegen, so daß die Dichtung im Bereich des Segmentes 6 nicht nur entlang der oberen Fläche des Verschlußrandes sondern auch von dessen Außenseite her er­folgen kann.Of course, the sealing washer 9 can also have a somewhat larger diameter and in some cases also rest against the inner wall of the cap casing 3, so that the seal in the region of the segment 6 can take place not only along the upper surface of the closure edge but also from the outside thereof.

Der Deutlichkeit halber ist in Figur 2 nochmals ein ähnlicher Verschlußquerschnitt dargestellt, bei welchem die Dichtungs­scheibe 9 fortgelassen wurde, so daß man deutlich auf der rech­ten Seite den Querschnitt der Sicke 5 erkennt, die sich in einer - je nach Betrachtungsweise - verdickten Kappenboden- oder Kappenmantelwand äußert und eine vorspringende Ecke bil­det, die den erhöhten linearen Anpreßdruck bewirkt. Auf der gegenüberliegenden Seite des in Figur 2 dargestellten Verschlus­ses ist wiederum ein Segment ohne Sicke geschnitten dargestellt, in welchem die Kappenwand 3 und der Kappenboden 2 ihre sonsti­ge Wandstärke im wesentlichen beibehalten und unter einem leicht abgerundeten 90°-Knick ineinander übergehen.For the sake of clarity, a similar closure cross-section is again shown in FIG. 2, in which the sealing washer 9 has been omitted, so that the cross-section of the bead 5 can be seen clearly on the right-hand side, which, depending on the point of view, can be found in a thickened cap bottom or cap jacket wall expresses and forms a protruding corner, which causes the increased linear contact pressure. On the opposite side of the closure shown in FIG. 2, a segment without a bead is again shown cut, in which the cap wall 3 and the cap base 2 essentially maintain their other wall thickness and merge into one another with a slightly rounded 90 ° bend.

Figur 3 zeigt einen Horizontalschnitt durch eine Kappe 1 im Bereich der Sicke 5. In dieser Darstellung erkennt man eben­falls deutlich die im Bereich der Sicke größere Wandstärke des Kappenmantels 3, die nur im Bereich des Unterbrechungssegmen­tes 6 ihr normales Maß hat. An der Außenseite des Kappenmantels 3 erkennt man eine Riffelung 12, welche das Auf- und Zuschrau­ben des Verschlusses erleichtern soll und auch in den Figuren 1 und 2 durch die äußeren vertikalen Linien am Kappenmantel 3 angedeutet ist.FIG. 3 shows a horizontal section through a cap 1 in the area of the bead 5. In this illustration, one can also clearly see the greater wall thickness of the cap jacket 3 in the area of the bead, which has its normal dimension only in the area of the interruption segment 6. On the outside of the cap casing 3, a corrugation 12 can be seen, which is intended to facilitate screwing and screwing on the closure and is also indicated in FIGS. 1 and 2 by the outer vertical lines on the cap casing 3.

Statt ein Unterbrechungssegment 6 in der Sicke 5 vorzusehen, kann jedoch auch die Oberseite 11 der Dichtungsscheibe 9 in einem Teilbereich der Sicke 5 eine Ausnehmung aufweisen, so daß dementsprechend auch in diesem Bereich der Anpreßdruck der Dichtungsscheibe 11 an den Verschlußrand einer Flasche geringer ist als im übrigen Bereich und ein Überdruck somit entweichen kann.Instead of providing an interruption segment 6 in the bead 5, however, the upper side 11 of the sealing disk 9 can also have a recess in a partial area of the bead 5, so that accordingly the contact pressure of the sealing disk 11 on the closure edge of a bottle is also lower in this area is than in the rest of the area and overpressure can thus escape.

Figur 5 zeigt die Draufsicht einer Dichtungsscheibe 9 mit einer Ausnehmung 6′ an ihrer dem Kappenboden zugewandten Ober­seite. In Figur 5 ist diese Ausnehmung 6′ in einer Querschnitt­darstellung der Dichtungsscheibe 9 zu erkennen. Wie man sieht, bleibt die Dichtungsscheibe 9 auf ihrer dichtenden Unterseite praktisch unverändert, wobei sie jedoch im Bereich der Aus­nehmung 6′ im wesentlichen nur aufgrund ihrer eigenen Steifig­keit an der dichtenden Kante des Mündungsrandes einer Flasche anliegt, während im übrigen Bereich die vorspringende Kante einer Sicke das Material der Dichtungsscheibe 9 zusammen- und an die äußere Kante des Mündungsrandes der Flasche anpreßt. Bei zu hohem Druck im Innern der Flasche hebt sich im Bereich der Ausnehmung 6′ die dichtende Unterseite vom Mündungsrand der Flasche ab und läßt so den Druck aus der Flasche entweichen, bis er so weit vermindert ist, daß sich die Dichtungsscheibe aufgrund ihrer Elastizität wieder an die Kante des Mündungs­randes anlegt.Figure 5 shows the top view of a sealing washer 9 with a recess 6 'on its top facing the cap bottom. In Figure 5, this recess 6 'can be seen in a cross-sectional view of the sealing washer 9. As you can see, the sealing washer 9 remains practically unchanged on its sealing underside, but it lies in the area of the recess 6 'essentially only because of its own rigidity at the sealing edge of the mouth of a bottle, while in the remaining area the projecting edge of a bead the material of the sealing washer 9 together and presses against the outer edge of the mouth of the bottle. If the pressure inside the bottle is too high, the sealing underside lifts off in the region of the recess 6 'from the mouth of the bottle, thus allowing the pressure to escape from the bottle until it is reduced so much that the sealing washer resumes due to its elasticity creates the edge of the rim of the mouth.

Claims (14)

1. Schraubverschluß aus Kunststoff für unter Druck stehende Flaschen, bestehend aus einer Kappe (1) mit einem Kappen­boden (2) und einem im wesentlichen zylindrischen Kappen­mantel (3) mit Innengewinde (7), einer umlaufenden und nach innen vorspringenden Sicke (5) am Übergang zwischen dem Kappenboden (2) und dem Kappenmantel (3), wobei eine gegen die Kappe bewegliche Dichtungsscheibe (9) an der In­nenseite des Kappenbodens (2) und der vorspringenden Sicke (5) anliegt, dadurch gekennzeichnet, daß die Sicke (5) eine segmentartige Unterbrechung (6) aufweist.1. Screw cap made of plastic for pressurized bottles, consisting of a cap (1) with a cap base (2) and a substantially cylindrical cap shell (3) with an internal thread (7), a circumferential and inwardly projecting bead (5) on Transition between the cap base (2) and the cap jacket (3), a sealing washer (9) movable against the cap bearing against the inside of the cap base (2) and the projecting bead (5), characterized in that the bead (5) has a segment-like interruption (6). 2. Schraubverschluß nach Anspruch 1, dadurch gekennzeichnet, daß die segmentartige Unterbrechung der Sicke sich über einen Kreisbogen von mindestens 15° erstreckt.2. Screw closure according to claim 1, characterized in that the segment-like interruption of the bead extends over an arc of at least 15 °. 3. Schraubverschluß nach Anspruch 1 oder 2, dadurch gekennzeich­net, daß die segmentartige Unterbrechung sich über einen3. Screw closure according to claim 1 or 2, characterized in that the segment-like interruption over a Kreisbogen von höchstens 60° erstreckt.Circular arc of no more than 60 °. 4. Schraubverschluß nach Anspruch 2 und 3, dadurch gekennzeich­net, daß die segmentartige Unterbrechung sich über einen Kreisbogen von etwa 30° erstreckt.4. Screw closure according to claim 2 and 3, characterized in that the segment-like interruption extends over an arc of about 30 °. 5. Schraubverschluß nach Anspruch 2 und 3, dadurch gekennzeich­net, daß die segmentartige Unterbrechung sich über einen Winkel von etwa 45° erstreckt.5. Screw closure according to claim 2 and 3, characterized in that the segment-like interruption extends over an angle of approximately 45 °. 6. Schraubverschluß nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß mehrere segmentartige Unterbrechungen (6) entlang der umlaufenden Sicke (5) angeordnet sind.6. Screw closure according to one of claims 1 to 5, characterized in that several segment-like interruptions (6) are arranged along the circumferential bead (5). 7. Schraubverschluß nach Anspruch 6, dadurch gekennzeichnet, daß die segmentartigen Unterbrechungen sich über jeweils gleiche Winkelbereiche unter jeweils gleichen Winkelabstän­den voneinander entlang des Sickenumfanges erstrecken.7. Screw closure according to claim 6, characterized in that the segment-like interruptions over each same angular ranges extend at the same angular distances from each other along the circumference of the beads. 8. Schraubverschluß für unter Druck stehende Flaschen, beste­hend aus einer Kappe (1) mit einem Kappenboden (2) und einem im wesentlichen zylindrischen Kappenmantel (3) mit Innenge­winde (7), wobei eine im wesentlichen an der Innenseite des Kappenbodens (2) angeordnete, gegen die Kappe bewegliche Dichtungsscheibe (9) vorgesenen ist, dadurch gekennzeichnet, daß die Dichtungsscheibe auf ihrer dem Kappenboden (2) und gegebenenfalls auch dem Kappenmantel (3) zugewandten Obersei­te (11) in ihrem mit dem Mündungsrand der Flasche in Be­rührung tretenden Randbereich mindestens eine Ausnehmung aufweist.8. Screw cap for pressurized bottles, consisting of a cap (1) with a cap base (2) and a substantially cylindrical cap shell (3) with an internal thread (7), one arranged essentially on the inside of the cap base (2) , against the cap movable sealing washer (9) is provided, characterized in that the sealing washer on its top face (11) facing the cap bottom (2) and optionally also the cap jacket (3) in its edge region which comes into contact with the mouth edge of the bottle at least has a recess. 9. Schraubverschluß nach Anspruch 8, dadurch gekennzeichnet, daß die Ausnehmung sich im Bereich des äußeren Randes der Dichtungsscheibe (9) über einen Winkelbereich von minde­stens 10° erstreckt.9. Screw closure according to claim 8, characterized in that the recess extends in the region of the outer edge of the sealing washer (9) over an angular range of at least 10 °. 10. Schraubverschluß nach Anspruch 9, dadurch gekennzeichnet, daß sich die Ausnehmung über einen Winkelbereich zwischen 15 und 35° erstreckt.10. Screw cap according to claim 9, characterized in that the recess extends over an angular range between 15 and 35 °. 11. Schraubverschluß nach einem der Ansprüche 8 bis 10, da­durch gekennzeichnet, daß die Tiefe der Ausnehmung minde­stens der Hälfte der Dicke der Dichtungsscheibe (9) im Be­reich neben der Ausnehmung entspricht.11. Screw closure according to one of claims 8 to 10, characterized in that the depth of the recess corresponds to at least half the thickness of the sealing washer (9) in the area next to the recess. 12. Schraubverschluß nach einem der Ansprüche 8 bis 10, da­durch gekennzeichnet, daß mehrere Ausnehmungen entlang des Umfangsbereiches der Dichtungsscheibe (9) vorgesehen sind.12. Screw closure according to one of claims 8 to 10, characterized in that a plurality of recesses are provided along the peripheral region of the sealing washer (9). 13. Schraubverschluß nach Anspruch 12, dadurch gekennzeichnet, daß die Ausnehmungen sich über jeweils gleiche Winkelbe­reiche im Bereich des äußeren Randes der Ausnehmung und unter jeweils gleichen Winkelabständen voneinander erstrek­ken.13. Screw cap according to claim 12, characterized in that the recesses extend over the same angular ranges in the region of the outer edge of the recess and at the same angular distances from each other.
EP89120148A 1988-11-22 1989-10-31 Screw closure for bottles having a deaeration device Expired - Lifetime EP0370272B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3839351A DE3839351A1 (en) 1988-11-22 1988-11-22 SCREW CAP FOR BOTTLES WITH VENTILATION DEVICE
DE3839351 1988-11-22

Publications (2)

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EP0370272A1 true EP0370272A1 (en) 1990-05-30
EP0370272B1 EP0370272B1 (en) 1994-07-13

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EP89120148A Expired - Lifetime EP0370272B1 (en) 1988-11-22 1989-10-31 Screw closure for bottles having a deaeration device

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US (1) US4997097A (en)
EP (1) EP0370272B1 (en)
DE (2) DE3839351A1 (en)
ES (1) ES2058441T3 (en)

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EP0503124A1 (en) * 1991-03-15 1992-09-16 DS-Chemie GmbH Polymer composition for container closure gaskets
US5639525A (en) * 1991-03-15 1997-06-17 Ds-Chemie Gmbh Polymer compound for the production of sealing elements for vessel or container closures
WO1994002371A1 (en) * 1992-07-16 1994-02-03 Precision Valve Australia Pty Ltd Tamper evident closure
EP0870693A2 (en) * 1992-07-16 1998-10-14 Closures and Packaging Services Limited Tamper evident closure
EP0870693A3 (en) * 1992-07-16 1998-12-09 Closures and Packaging Services Limited Tamper evident closure
EP0900742A1 (en) * 1997-08-04 1999-03-10 Weiss K.G. Plastic screw cap
EP0987191A1 (en) 1998-09-14 2000-03-22 Crown Cork & Seal Technologies Corporation Closure cap
EP0987190A1 (en) 1998-09-14 2000-03-22 Crown Cork & Seal Technologies Corporation Closure cap
WO2000015504A2 (en) 1998-09-14 2000-03-23 Crown Cork & Seal Technologies Corporation Closure cap
WO2000015505A2 (en) 1998-09-14 2000-03-23 Crown Cork & Seal Technologies Corporation Closure cap
WO2000015505A3 (en) * 1998-09-14 2002-09-26 Crown Cork & Seal Tech Corp Closure cap
WO2000015504A3 (en) * 1998-09-14 2002-10-03 Crown Cork & Seal Tech Corp Closure cap
US6502710B1 (en) 1998-09-14 2003-01-07 Crown Cork & Steal Technologies Corporation Closure cap
US6783015B1 (en) 1998-09-14 2004-08-31 Crown Cork & Seal Technologies Corporation Closure cap

Also Published As

Publication number Publication date
EP0370272B1 (en) 1994-07-13
US4997097A (en) 1991-03-05
DE3839351A1 (en) 1990-05-31
ES2058441T3 (en) 1994-11-01
DE58908040D1 (en) 1994-08-18

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