EP0960054B1 - Plastic screw top - Google Patents

Plastic screw top Download PDF

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Publication number
EP0960054B1
EP0960054B1 EP98909299A EP98909299A EP0960054B1 EP 0960054 B1 EP0960054 B1 EP 0960054B1 EP 98909299 A EP98909299 A EP 98909299A EP 98909299 A EP98909299 A EP 98909299A EP 0960054 B1 EP0960054 B1 EP 0960054B1
Authority
EP
European Patent Office
Prior art keywords
sealing
bottle neck
sealing strip
olive
diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98909299A
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German (de)
French (fr)
Other versions
EP0960054B2 (en
EP0960054A1 (en
Inventor
Günter Krautkrämer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bericap GmbH and Co KG
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Bericap GmbH and Co KG
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Publication date
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Application filed by Bericap GmbH and Co KG filed Critical Bericap GmbH and Co KG
Publication of EP0960054A1 publication Critical patent/EP0960054A1/en
Publication of EP0960054B1 publication Critical patent/EP0960054B1/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
    • 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
    • B65D41/0407—Threaded or like caps or cap-like covers secured by rotation with integral sealing means
    • B65D41/0414—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a plug, collar, flange, rib or the like contacting the internal surface of a container neck
    • B65D41/0421—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a plug, collar, flange, rib or the like contacting the internal surface of a container neck and combined with integral sealing means contacting other surfaces of a container neck
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S215/00—Bottles and jars
    • Y10S215/901—Tamper-resistant structure

Definitions

  • the present invention relates to a plastic screw cap for bottles, consisting of from a substantially cylindrical jacket with an internal thread for screwing on the external thread of a bottle neck, and with a substantially circular disc Head plate and a substantially cylindrical and from the inside of the Head plate axially inwardly extending sealing strip, whose outer diameter in corresponds approximately to the outer bottle neck diameter or is slightly larger and whose inner diameter is clearly smaller than the outer bottle neck edge, being radial outside the weather strip at the transition from the top plate to the jacket of the Closure a bead is provided with an approximately cylindrical inner surface, the Inner diameter at most equal to and preferably slightly less than the sum of Bottle neck diameter and twice the thickness of the weather strip.
  • the well-known plastic screw closure is for screwing onto the threaded neck of Bottles provided and designed so that the approximately cylindrical sealing strip from above and outside on the bottle neck rim and essentially along the upper outer, rounded edge of the bottle neck or bottle mouth fits tightly.
  • the sealing strip is also between an outer, clamped in approximately cylindrical bead and the bottle neck and in firm sealing engagement pulled and pressed with the bottle neck rim.
  • it would be one Closure also for plastic bottles, e.g. PET bottles, usable.
  • closure cap has already become known, which is particularly useful should ensure good sealing engagement. Instead of a roughly cylindrical sealing strip
  • this known closure cap is approximately horizontal extending sealing strip, which rests on the upper edge of the bottle neck, whereby
  • annular projections are provided on the bottom or the top plate of the closure cap are on the side of the sealing strip opposite the edge of the bottle neck engage with this and apply a linear sealing pressure to the Should exert sealing strips.
  • the inner surface of a bottle neck is in general at least in the case of PET bottles fairly precisely defined, but may well be damaged, so that the Projection of the sealing olive despite its essentially linear engagement with the The inside of the bottle neck cannot guarantee a secure seal.
  • the sealing lead in the known closure is also at a considerable distance from the approach of the sealing lamella provided on the head plate, so that there are none in the region of the projection result in very high elastic restoring or pressing forces.
  • An essentially radially extending sealing lamella partially covers that outer, generally well-defined, rounded bottle neck rim, but also may be damaged, however, just like the sealing olive, does not cover the inner, slightly rounded Edge of the bottle neck rim.
  • EP 0076778 discloses a sealing cap with a sealing ring and a sealing olive known.
  • the sealing ring is, tapering in diameter, obliquely inwards directed, so that the demolding is difficult to accomplish and also the Sealing function of the sealing ring is worse, since the sealing ring is only under pressure on the Bottleneck edge hangs up and not, as with the essentially cylindrical axially on the inside of the headstock, inward-extending weather strips, while stretching on the bottle neck slides open.
  • the known closures therefore have at least partial manufacturing problems and especially when demolding and, on the other hand, do not yet guarantee an absolutely secure seal in the event of minor damage or deformation of the bottle neck rim or in harsh transportation conditions and high temperatures.
  • the object of the present invention is to create a plastic screw closure with the features mentioned at the outset, which prevents leaks even better and which also if possible should be easy to demold to make it as simple as possible To facilitate injection mold.
  • the plastic screw closure has the further features that a further, essentially cylindrical sealing strip, hereinafter referred to as sealing olive, with a cross-sectional shape which approximately corresponds to an olive, radially inside the cylindrical sealing strip, is provided, the outer diameter of which, at least in the area near the head plate and opposite the sealing strip, is larger than the inner diameter of a bottle neck for which the closure is provided, and that the deviation (
  • an inner sealing olive is also provided, which also Seals the inner surface at the top of the bottle neck.
  • This sealing olive also in the sealing strip located near the head plate opposite area, i.e. in the area where screwed onto a bottle Closure usually also the top edges of the bottle neck, still has a larger outside diameter than the inside diameter of the bottle neck or the bottle neck edge in this area, so that the inner Sealing olive is pushed radially inwards and thereby seals against the inner surface of the bottle neck edge.
  • the clear distance between the sealing strip and the sealing olive must be smaller than it corresponds to the thickness of the bottle neck rim.
  • the clear distance between sealing strips and sealing olive in the sealing area less than two thirds, possibly even is less than half the thickness of the bottle neck. Since the sealing olive as well as the Sealing strips preferably consist of the plastic material of the closure, they have sufficient elasticity to be attached or screwed on Closure to be pushed away by the edge of the bottle neck, but due to the occurring elastic restoring forces in very firm, sealing engagement with the upper Bottle neck edge to come.
  • the Sealing olive on its outside has a flat bead, which in cross section approximately Has the shape of an obtuse-angled triangle.
  • the sealing olive is preferably rounded and / or beveled, so that with the axial movement in the direction of the bottle neck the sealing olive actually is pressed radially inwards and does not sit on the edge of the bottle neck or even radially is pushed outwards.
  • the sealing strip is also on in the preferred embodiment its free end has a rounded and / or beveled shape so that it is axial Moving radially outward towards the bottle neck when it is spreading the neck of the bottle comes into engagement.
  • the olive in the preferred embodiment is approximately twice as thick and at least 50% longer (in the axial direction) than the sealing strip.
  • the axial length of the sealing olive is preferably approximately twice the axial length Length of the weather strip.
  • the deviation of the outer diameter the sealing olive of the diameter of the bottle neck edge, at least in the Area where the seal essentially occurs is less than the corresponding deviation of the inner diameter of the sealing strip from the outer diameter of the Bottleneck edge, because the sealing strip is thinner and shorter and therefore more elastic is stretchable and movable away.
  • the outer surfaces of the sealing olive and the inner surface of the sealing strip preferably run essentially parallel across the axial extent of the sealing strip, i.e. one has an approximately constant clearance over the length of the sealing strip Width between sealing olive and sealing strip, and the outer surface of the sealing motif runs doing so, especially in the axial height of the end of the sealing strip parallel to the beveled and rounded shape of the same. So in cross section it has between the sealing olive and sealing strips formed a narrow, slightly concave curved and above cavity rounded shape, is open at the bottom and closed at the top.
  • the one from The cavity which is slightly curved upwards, has a cross section essentially constant width and tapers only at its upper closed and rounded end, the upper section, relative to the closure axis, almost is cylindrical, and the lower section is tapered towards the outside.
  • the axial length of the cavity which is significantly narrower than the associated bottle neck, is included defined by the length of the outer weather strip, which in turn is relatively short, so that when screwed onto a bottle neck, it was just the outer, rounded one Bottleneck rim completely covered. This leaves the narrow cavity between Sealing olive and sealing strips axially correspondingly short, which means the manufacturing process and the design of a corresponding injection molding tool is also easy.
  • this cavity has an axial depth (corresponding to the axial length of the weather strip) of less than 4 mm, preferably less than 3 mm and in particular about 2 to 2.5 mm.
  • the free end of the jacket of the screw cap is preferably in one piece with one Guarantee and tear-off tape provided.
  • Guarantee and tear-off tape As well as the overall closure in the preferred Embodiment from a single piece of a homogeneous plastic material in Injection molding technology is made.
  • the essentially cylindrical shapes of the sealing olive and of the sealing strip and the short axiaie length of the same allow a relatively light and simple demolding and a correspondingly simply shaped manufacturing tool.
  • the screw closure according to the invention can be seen in FIG. 1 a in the axis containing longitudinal section.
  • the screw cap essentially consists of a cylindrical one Sheath 1 with an integral, approximately circular disk-shaped Head plate 2.
  • At the free end of the cylindrical jacket 1 is also, also in one piece, with the jacket 1, a guarantee and tear tape 7, which by unscrewing the screw cap tears open from a bottle or tears from the jacket 1 and thus an already open one Features bottle.
  • the cylindrical jacket 1 has a partially interrupted internal thread 8 and on it The outside is a handle corrugation 9, the application of torque when gripping the soft Closure cap should ease my fingers.
  • the two elements which effect the seal with the bottle neck are the ring-shaped circumferential, cylindrical sealing strips 4 and also ring-shaped and parallel to it circumferential sealing olive 3.
  • the outer wall of the cylindrical runs Sealing strip 4 as well as the inner wall of the cylindrical sealing olive 3 in section straight and therefore pretty exactly cylindrical.
  • the inner wall of the cylindrical weather strip 4 runs axially parallel only over a relatively short section and is then in Rounded in the direction of the free end and sloping towards the outside.
  • the outer wall of the cylindrical "olive" 3 has a bead with a flat cross section in the shape of a obtuse-angled triangle, the obtuse tip of this obtuse-angled triangle maximum outer diameter of the neck 3 or the bead defined and axially approximately coincides with the free end of the weather strip 4.
  • Runs towards the head plate 2 then the outer wall of the cylindrical sealing olive 3, starting from the bead approximately parallel to the sloping and rounded end section before again runs approximately axially parallel and then in an arc in the inner wall of the weather strip 4 passes.
  • FIG 1b the closure is shown approximately in natural size in a side view.
  • the corrugation 9 on the outside of the screw cap, which should make it easier to screw on and screw on the closure, as well as the lower guarantee and tear-off tape 7.
  • the closure is shown exactly to scale in FIGS. 1 and 2, the dimension R a is slightly less than 31 mm. Because of the true-to-scale representation, all other dimensions can also be derived from this, and the absolute and relative dimensions of all elements are disclosed by the figures due to the true-to-scale representation. It is understood, however, that the invention is not limited to compliance with the absolute and relative dimensions of the individual elements of the closure cap.
  • the free end of the sealing olive 3 is significantly rounded, so that the free end of the Sealing olive 3, when it hits the edge of a bottle neck, slides inwards and is pushed away.
  • the plastic screw cap is again in the same Cutting plane, but recognizable in the state screwed onto a bottle neck.
  • the sealing olive 3 is due to the engagement of its rounded free end with the end face of the bottle neck 10 pushed inwards, the bead lies against the inner cylindrical surface of the bottle neck. As you can see, it is cylindrical Olive 3 pushed inward and compressed so that there is a corresponding elastic restoring force results, which creates a tight sealing engagement.
  • the seal results from the engagement with the sealing strip 4, which, when its free, rounded or beveled end comes into engagement, is pushed outward with the end face of the bottle neck and then clamped between the outer surface of the bottle neck and a cylindrical bead 5 and is pulled through the bead around the upper outer edge of the bottle, this bead 5 being provided at the transition between the cap jacket and the top plate and having a substantially cylindrical inner surface.
  • the sealing olive 3 is significantly thicker and preferably about twice as thick (without considering the bead) as the sealing strip 4, it is provided in the preferred embodiment of the invention that the outer diameter 2R 1 of the sealing olive, in the area in which it is engages the upper edge of the bottle neck, has a smaller difference to the inner diameter d of the bottle neck edge in this area than the sealing strip 4 with its inner surface relative to the outer edge of the bottle neck, since the sealing strip 4 is more easily deformable than the sealing olive 3 with the same force can also be clearly seen in Figure 2 and by comparison with Figure 1.
  • between the sealing olive and the inner edge of the bottle neck when the closure is not screwed onto a bottle neck is only about a third to a quarter of the difference in diameter D - 2r 2 between the inner surface of the sealing strip and the outer edge of the bottle neck.
  • the closure according to the invention ensures that both the upper outer edge as well as the inner surface of the bottle neck between two opposite Sealing elements are bordered and sealed. You have two almost equivalent and independent seals, so that in the case of unnoticed Damage, deformation or tolerance deviations of the upper edge of the bottle neck the likelihood that at least one of the two seals will provide an adequate seal guaranteed to be relatively large since it is unlikely to be damaged or deformation that affects both the upper outer edge and the upper inner surface of the Bottleneck edge captured, remains unnoticed.
  • the bottle neck exerts radially opposite on the two sealing elements Forces that largely cancel each other out. This avoids that the conventional gaskets on one side that absorb these forces (or cap base) yields to these forces through slow flow and thus the sealing engagement gradually weakens.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Insulators (AREA)
  • Finger-Pressure Massage (AREA)
  • Prostheses (AREA)
  • Materials For Medical Uses (AREA)

Abstract

A plastic screw closure for bottles comprising a cap having a substantially cylindrical peripheral portion (1) with an internal screw thread (8) for screwing onto an external screw thread (11) of a bottle neck (10), and with a disc-like top plate portion (2). A substantially cylindrical sealing strip (4) which extends axially from the inside of the top plate portion (2) has an outside diameter at least equal to the bottle neck's outside diameter (D) and an inside diameter (2r2) smaller than the bottle neck's outside diameter (D). Inside the cylindrical sealing strip (4), a further, substantially cylindrical sealing olive-shaped button (3) is radially fitted, the outside diameter (2R1) of which, at least in the area near the top plate and opposite the sealing strip (4), is larger than the inside diameter (d) of the bottle neck (10).

Description

Die vorliegende Erfindung betrifft einen Kunststoffschraubverschluß für Flaschen, bestehend aus einem im wesentlichen zylindrischen Mantel mit Innengewinde für das Aufschrauben auf das Außengewinde eines Flaschenhalses, und mit einer im wesentlichen kreisscheibenförmigen Kopfplatte sowie einem im wesentlichen zylindrischen und sich von der Innenseite der Kopfplatte axial nach innen erstreckenden Dichtungsstreifen, dessen Außendurchmesser in etwa dem äußeren Flaschenhalsdurchmesser entspricht oder aber geringfügig größer ist und dessen Innendurchmesser eindeutig kleiner ist als der äußere Flaschenhalsrand, wobei radial außerhalb des Dichtungsstreifens am Übergang von der Kopfplatte zu dem Mantel des Verschlusses ein Wulst mit einer in etwa zylindrischen Innenfläche vorgesehen ist, dessen Innendurchmesser höchstens gleich der und vorzugsweise etwas geringer als die Summe aus Flaschenhalsdurchmesser und dem Zweifachen der Dicke des Dichtungsstreifens ist.The present invention relates to a plastic screw cap for bottles, consisting of from a substantially cylindrical jacket with an internal thread for screwing on the external thread of a bottle neck, and with a substantially circular disc Head plate and a substantially cylindrical and from the inside of the Head plate axially inwardly extending sealing strip, whose outer diameter in corresponds approximately to the outer bottle neck diameter or is slightly larger and whose inner diameter is clearly smaller than the outer bottle neck edge, being radial outside the weather strip at the transition from the top plate to the jacket of the Closure a bead is provided with an approximately cylindrical inner surface, the Inner diameter at most equal to and preferably slightly less than the sum of Bottle neck diameter and twice the thickness of the weather strip.

Ein derartiger Kunststoffschraubverschluß für Flaschen ist bereits aus der DE 41 28 474 bekannt.Such a plastic screw cap for bottles is already known from DE 41 28 474 known.

Der bekannte Kunststoffschraubverschluß ist für das Aufschrauben auf den Gewindehals von Flaschen vorgesehen und so ausgestaltet, daß der in etwa zylindrische Dichtungsstreifen sich von oben und außen her auf den Flaschenhalsrand auflegt und dabei im wesentlichen entlang der oberen äußeren, abgerundeten Kante des Flaschenhalses bzw. der Flaschenmündung dichtend anliegt. Dabei wird der Dichtungsstreifen zusätzlich noch zwischen einem äußeren, in etwa zylinderförmigen Wulst und dem Flaschenhals eingeklemmt und in festen Dichtungseingriff mit dem Flaschenhalsrand gezogen und gedrückt. Grundsätzlich wäre ein solcher Verschluß auch für Kunststoffflaschen, z.B. PET-Flaschen, verwendbar.The well-known plastic screw closure is for screwing onto the threaded neck of Bottles provided and designed so that the approximately cylindrical sealing strip from above and outside on the bottle neck rim and essentially along the upper outer, rounded edge of the bottle neck or bottle mouth fits tightly. The sealing strip is also between an outer, clamped in approximately cylindrical bead and the bottle neck and in firm sealing engagement pulled and pressed with the bottle neck rim. Basically, it would be one Closure also for plastic bottles, e.g. PET bottles, usable.

Bei Mehrwegflaschen aus Glas werden die Flaschen insgesamt und insbesondere auch die Flaschenhälse und -mündungen vor der Wiederverwendung visuell geprüft. Dabei kann jedoch nicht ausgeschlossen werden, daß Beschädigungen des Flaschenhalsrandes in dem Bereich, wo er mit der Verschlußkappe bzw. Dichtungselementen der Verschlußkappe in Dichtungseingriff tritt, übersehen werden, insbesondere wenn diese Beschädigungen relativ klein und unauffällig sind. Grundsätzlich gilt dies auch für Kunststoffflaschen, insbesondere für die zunehmend mehr Verbreitung findenden PET-Flaschen. Bei Kunststoffflaschen ist unter Umständen auch herstellungsbedingt mit etwas größeren Fertigungstoleranzen oder mit Beschädigungen im Verlaufe der Herstellung oder Handhabung zu rechnen. Kleine Beschädigungen, insbesondere in Form von kleinen Dellen oder Riefen, sind visuell nur schwer zu erkennen. Es kann also durchaus vorkommen, daß Flaschen abgefüllt und verschlossen werden, deren Flaschenhalsrand geringfügige Beschädigungen, Verformungen oder herstellungsbedingte Unebenheiten aufweist, die bei einer Überprüfung leicht übersehen werden, die aber ausreichen, den Dichtungseingriff zwischen Flaschenhalsrand und Dichtungselementen der Verschlußkappe zu beeinträchtigen. Dies gilt insbesondere, wenn das Flascheninnere unter Druck steht, wie z. B. im Falle der Verwendung der Flaschen für kohlensäurehaltige Getränke. Eine schlechte Abdichtung kann bei solchen Flaschen dazu führen, daß Gas aus der Flasche entweicht und dadurch den Druck absenkt, was wiederum zu einem Ausgasen der in dem Getränk enthaltenen Kohlensäure führt, welches dann nach einigen Tagen oder Wochen Lagerzeit seine Kohlensäure weitgehend verloren hat und entsprechend schal schmeckt.In the case of reusable glass bottles, the bottles as a whole and in particular the bottles Bottle necks and mouths visually inspected before reuse. However, it can it cannot be excluded that damage to the edge of the bottle neck in the area where he is in sealing engagement with the sealing cap or sealing elements of the sealing cap occurs, are overlooked, especially if this damage is relatively small and are inconspicuous. Basically, this also applies to plastic bottles, especially for PET bottles are becoming increasingly widespread. For plastic bottles is under Under certain circumstances, also due to the manufacturing process, with somewhat larger manufacturing tolerances or with damage to be expected in the course of manufacture or handling. Small damages, especially in the form of small dents or marks, are difficult to visually detect. So it can happen that bottles are filled and closed the edge of the bottle neck is slightly damaged, deformed or caused by production Bumps that are easily overlooked during a check, which are sufficient, however, the sealing engagement between the bottle neck edge and sealing elements affect the cap. This is especially true if the inside of the bottle is under pressure, such as B. in the case of using the bottles for carbonated Beverages. A bad seal can lead to gas from the bottle Bottle escapes and thereby lowers the pressure, which in turn leads to outgassing the the drink contains carbon dioxide, which then takes a few days or weeks Storage time has largely lost its carbon dioxide and tastes accordingly stale.

Aus der WO 96/02430 ist bereits eine Verschlußkappe bekannt geworden, die einen besonders guten Dichtungseingriff gewährleisten soll. Anstelle eines in etwa zylindrischen Dichtungsstreifens weist diese bekannte Verschlußkappe jedoch einen sich in etwa horizontal erstreckenden Dichtungsstreifen auf, der sich auf den oberen Flaschenhalsrand auflegt, wobei zusätzlich ringförmige Vorsprünge am Boden bzw. der Kopfplatte der Verschlußkappe vorgesehen sind, die auf der dem Flaschenhalsrand gegenüberliegenden Seite des Dichtungsstreifens mit diesem in Eingriff treten und einen linienförmigen Dichtungsdruck auf den Dichtungsstreifen ausüben sollen. Zusätzlich ist noch eine innere, in etwa zylinderförmige Dichtolive vorgesehen, wobei der Begriff "Olive" anschaulich den unteren Querschnitt dieses Teiles umschreibt, welcher einen nach außen vorspringenden Bereich hat, der ebenfalls in etwa linienförmig mit der zylindrischen Innenfläche des Flaschenhalses in Eingriff treten soll. Die Innenfläche eines Flaschenhalses ist zwar zumindest bei PET-Flaschen im allgemeinen ziemlich exakt definiert, kann jedoch durchaus Beschädigungen aufweisen, so daß der Vorsprung der Dichtolive trotz seines im wesentlichen linienförmigen Eingriffs mit dem Flaschenhalsinneren keine sichere Abdichtung gewährleisten kann. Der dichtende Vorsprung bei dem bekannten Verschluß ist außerdem in erheblichem Abstand zum Ansatz der Dichtungslamelle an der Kopfplatte vorgesehen, so daß sich im Bereich des Vorsprunges keine sehr hohen elastischen Rückstell- bzw. Andruckkräfte ergeben.From WO 96/02430 a closure cap has already become known, which is particularly useful should ensure good sealing engagement. Instead of a roughly cylindrical sealing strip However, this known closure cap is approximately horizontal extending sealing strip, which rests on the upper edge of the bottle neck, whereby In addition, annular projections are provided on the bottom or the top plate of the closure cap are on the side of the sealing strip opposite the edge of the bottle neck engage with this and apply a linear sealing pressure to the Should exert sealing strips. In addition there is an inner one, approximately cylindrical Sealing olive provided, the term "olive" clearly showing the lower cross section of this Describes part, which has an outwardly projecting area, which is also in should engage approximately linearly with the cylindrical inner surface of the bottle neck. The inner surface of a bottle neck is in general at least in the case of PET bottles fairly precisely defined, but may well be damaged, so that the Projection of the sealing olive despite its essentially linear engagement with the The inside of the bottle neck cannot guarantee a secure seal. The sealing lead in the known closure is also at a considerable distance from the approach of the sealing lamella provided on the head plate, so that there are none in the region of the projection result in very high elastic restoring or pressing forces.

Eine sich im wesentlichen radial erstreckende Dichtungslamelle überdeckt zwar teilweise den äußeren, im allgemeinen wohl definierten, abgerundeten Flaschenhalsrand, der aber auch beschädigt sein kann, erfaßt jedoch ebenso wie die Dichtolive nicht die innere, leicht abgerundete Kante des Flaschenhalsrandes. Diese zur Achse des Verschlusses unterschiedlich angestellten Teile definieren eine sacklochartige Vertiefung mit erheblicher Hinterschneidung, die bei der Herstellung und bei dem dabei notwendigen Herauspressen von Luft erhebliche Probleme bereitet. An essentially radially extending sealing lamella partially covers that outer, generally well-defined, rounded bottle neck rim, but also may be damaged, however, just like the sealing olive, does not cover the inner, slightly rounded Edge of the bottle neck rim. These differ from the axis of the closure employed parts define a blind hole-like depression with considerable undercut, the considerable in the production and in the necessary pressing out of air Problems.

Aus der WO 96/26121 ist ein entsprechender Schraubverschluß bekannt, der außer einer in etwa konisch nach außen gerichteten, umlaufenden Dichtungslamelle, welche mit dem äußeren Flaschenhalsrand in Eingriff treten soll, zusätzlich noch einen inneren Zentrieransatz aufweist, dessen Außendurchmesser jedoch etwas geringer ist als der Innendurchmesser des Flaschenhalses und der keine Dichtfunktion aufweist. Dieser Ansatz tritt daher nicht in Dichtungseingriff mit dem Inneren des Flaschenhalses und insbesondere nicht mit dem oberen inneren Flaschenhalsrand.From WO 96/26121 a corresponding screw closure is known which, apart from one in about conical outward, circumferential sealing lamella, which with the outer neck of the bottle should engage, additionally an inner centering shoulder has, whose outer diameter is somewhat smaller than the inner diameter of the Bottle neck and which has no sealing function. This approach therefore does not occur Sealing engagement with the inside of the bottle neck and especially not with the top inner bottle neck rim.

Wegen der konischen Form der Dichtungslamelle ist die Entformung eines solchen Verschlusses aus einem Spritzgießwerkzeug relativ schwierig und aufwendig. Dies gilt noch mehr für den zuvor erwähnten Verschluß gemäß WO 96/02430, bei welcher die Dichtungslamelle sich parallel zur Kopfplatte radial einwärts nahezu in einer Ebene erstreckt und zusammen mit einer weiter innen liegenden Dichtolive einen nahezu geschlossenen Hohlraum definiert.Because of the conical shape of the sealing lamella, such a closure is removed from the mold from an injection mold relatively difficult and expensive. This applies even more to the aforementioned closure according to WO 96/02430, in which the sealing lamella extends parallel to the head plate radially inward almost in one plane and together with an inner sealing olive defines an almost closed cavity.

Aus der EP 0076778 ist eine Verschlußkappe mit einem Dichtring und einer Dichtolive bekannt. Der Dichtring ist aber, sich im Durchmesser verjüngend, schräg nach innen gerichtet, so daß auch hier die Entformung nur schwer zu bewerkstelligen ist und zudem die Dichtfunktion des Dichtringes schlechter ist, da sich der Dichtring nur unter Druck auf den Flaschenhalsrand auflegt und nicht, wie bei dem im wesentlichen zylindrischen sich axial von der Innenseite der Kopfplatte nach innen erstreckende Dichtungsstreifen, unter Dehnung auf den Flaschenhals aufgleitet.EP 0076778 discloses a sealing cap with a sealing ring and a sealing olive known. However, the sealing ring is, tapering in diameter, obliquely inwards directed, so that the demolding is difficult to accomplish and also the Sealing function of the sealing ring is worse, since the sealing ring is only under pressure on the Bottleneck edge hangs up and not, as with the essentially cylindrical axially on the inside of the headstock, inward-extending weather strips, while stretching on the bottle neck slides open.

Die bekannten Verschlüsse haben daher zumindest teilweise Probleme bei der Herstellung und insbesondere beim Entformen und gewähren andererseits noch keine absolut sichere Abdichtung im Falle von kleinen Beschädigungen oder Verformungen des Flaschenhalsrandes oder bei rauhen Transportbedingungen und hohen Temperaturen.The known closures therefore have at least partial manufacturing problems and especially when demolding and, on the other hand, do not yet guarantee an absolutely secure seal in the event of minor damage or deformation of the bottle neck rim or in harsh transportation conditions and high temperatures.

Gegenüber diesem Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen Kunststoffschraubverschluß mit den eingangs genannten Merkmalen zu schaffen, welcher Undichtigkeiten noch besser verhindert und welcher darüber hinaus nach Möglichkeit leicht entformbar sein sollte, um das Herstellen mit einem möglichst einfach gebauten Spritzgießwerkzeug zu erleichtern.Compared to this prior art, the object of the present invention is to create a plastic screw closure with the features mentioned at the outset, which prevents leaks even better and which also if possible should be easy to demold to make it as simple as possible To facilitate injection mold.

Diese Aufgabe wird dadurch gelöst, daß der Kunststoffschraubverschluß zusätzlich zu den eingangs genannten Merkmalen die weiteren Merkmale aufweist, daß radial innerhalb des zylindrischen Dichtungsstreifens ein weiterer, im wesentlichen zylindrischer Dichtungsstreifen, nachstehend als Dichtolive bezeichnet, mit einer Querschnittsform, die in etwa einer Olive entspricht, vorgesehen ist, dessen Außendurchmesser mindestens in dem nahe der Kopfplatte gelegenen und dem Dichtungsstreifen gegenüberliegenden Bereich größer ist als der Innendurchmesser eines Flaschenhalses, für welchen der Verschluß vorgesehen ist, und daß die Abweichung (|2R1 - d|) des Außendurchmessers der Dichtolive vom Innendurchmesser des Flaschenhalses deutlich geringer ist als die Abweichung (|2r2 - D|) des Innendurchmessers des Dichtungsstreifens vom Außendurchmesser des Flaschenhalses.This object is achieved in that, in addition to the features mentioned at the outset, the plastic screw closure has the further features that a further, essentially cylindrical sealing strip, hereinafter referred to as sealing olive, with a cross-sectional shape which approximately corresponds to an olive, radially inside the cylindrical sealing strip, is provided, the outer diameter of which, at least in the area near the head plate and opposite the sealing strip, is larger than the inner diameter of a bottle neck for which the closure is provided, and that the deviation (| 2R 1 - d |) of the outer diameter of the sealing olive from the inner diameter of the bottle neck is significantly smaller than the deviation (| 2r 2 - D |) of the inside diameter of the sealing strip from the outside diameter of the bottle neck.

Während der äußere Dichtungsstreifen, der in etwa so ausgestaltet ist, wie im Falle der bekannten DE 41 28 474, somit eine recht gute Abdichtung des oberen äußeren Flaschenhalsrandes erreicht, ist zusätzlich eine innere Dichtolive vorgesehen, die zusätzlich auch die Innenfläche am oberen Rand des Flaschenhalses abdichtet. Letzteres wird dadurch erreicht, daß diese Dichtolive auch in dem nahe der Kopfplatte gelegenen und dem Dichtungsstreifen gegenüberliegenden Bereich, d.h. in dem Bereich, in welchem bei auf eine Flasche aufgeschraubtem Verschluß normalerweise auch die oberen Ränder des Flaschenhalses liegen, immer noch einen größeren Außendurchmesser hat als es dem Innendurchmesser des Flaschenhalses bzw. des Flaschenhalsrandes in diesem Bereich entspricht, so daß also die innere Dichtolive radial nach innen weggedrängt wird und sich dabei abdichtend an die Innenfläche des Flaschenhalsrandes anlegt. Aus den Durchmesserbedingungen für den Dichtungsstreifen und die Dichtolive ergibt sich zwangsweise, daß in einer gegebenen axialen Position, und insbesondere in dem axialen Bereich, in welchem sich der obere Flaschenhalsrand befindet, der lichte Abstand zwischen dem Dichtungsstreifen und der Dichtolive kleiner sein muß als es der Dicke des Flaschenhalsrandes entspricht. Besonders bevorzugt ist dabei eine Ausführungsform der Erfindung, bei welcher der lichte Abstand zwischen Dichtungsstreifen und Dichtolive in dem abdichtenden Bereich weniger als zwei Drittel, unter Umständen sogar weniger als die Hälfte der Dicke des Flaschenhalses beträgt. Da die Dichtolive ebenso wie der Dichtungsstreifen vorzugsweise aus dem Kunststoffmaterial des Verschlusses bestehen, haben sie eine genügende Elastizität, um beim Aufsetzen bzw. Festschrauben des Verschlusses durch den Flaschenhalsrand weggedrängt zu werden, dabei jedoch aufgrund der auftretenden elastischen Rückstellkräfte in sehr festen, dichtenden Eingriff mit dem oberen Flaschhalsrand zu kommen.While the outer weather strip, which is designed approximately as in the case of the known DE 41 28 474, thus a very good seal of the upper outer edge of the bottle neck reached, an inner sealing olive is also provided, which also Seals the inner surface at the top of the bottle neck. The latter is achieved that this sealing olive also in the sealing strip located near the head plate opposite area, i.e. in the area where screwed onto a bottle Closure usually also the top edges of the bottle neck, still has a larger outside diameter than the inside diameter of the bottle neck or the bottle neck edge in this area, so that the inner Sealing olive is pushed radially inwards and thereby seals against the inner surface of the bottle neck edge. From the diameter conditions for the sealing strip and the sealing olive is forced to result in a given axial position, and especially in the axial area in which the upper edge of the bottle neck is located, the clear distance between the sealing strip and the sealing olive must be smaller than it corresponds to the thickness of the bottle neck rim. One is particularly preferred Embodiment of the invention in which the clear distance between sealing strips and sealing olive in the sealing area less than two thirds, possibly even is less than half the thickness of the bottle neck. Since the sealing olive as well as the Sealing strips preferably consist of the plastic material of the closure, they have sufficient elasticity to be attached or screwed on Closure to be pushed away by the edge of the bottle neck, but due to the occurring elastic restoring forces in very firm, sealing engagement with the upper Bottle neck edge to come.

Zusätzlich ist in der bevorzugten Ausführungform der Erfindung vorgesehen, daß die Dichtolive auf ihr Außenseite einen flachen Wulst aufweist, der im Querschnitt in etwa die Form eines stumpfwinkligen Dreiecks hat. In addition, it is provided in the preferred embodiment of the invention that the Sealing olive on its outside has a flat bead, which in cross section approximately Has the shape of an obtuse-angled triangle.

Dabei ist zu berücksichtigen, daß das radiale Wegdrängen des inneren Ansatzes nach innen gleichbedeutend mit einer Kompression des Materials ist, aus welchem die Dichtolive besteht. Der Wulst, der einen entsprechend größeren Außendurchmesser hat, tritt zum einen in Dichtungseingriff mit der Innenfläche des Flaschenhalsrandes und erzwingt darüber hinaus eine stärkere Kompression des Materials, aus welchem die Dichtolive besteht, und damit eine Vergrößerung der elastischen Rückstellkraft, die letztlich den sicheren Dichtungseingriff gewährleistet.It should be borne in mind that the radial pushing away of the inner approach inwards is synonymous with compression of the material from which the sealing olive is made. The bead, which has a correspondingly larger outer diameter, enters on the one hand Sealing engagement with the inside surface of the bottle neck rim and beyond a stronger compression of the material from which the sealing olive is made, and thus a Enlargement of the elastic restoring force, which ultimately ensures safe sealing engagement guaranteed.

An ihrem freien Ende ist die Dichtolive vorzugsweise abgerundet und/oder abgeschrägt, so daß bei der axialen Eewegung in Richtung des Flaschenhalses die Dichtolive auch tatsächlich radial nach innen gedrückt wird und nicht auf dem Flaschenhalsrand aufsitzt oder gar radial nach außen weggedrängt wird.At its free end, the sealing olive is preferably rounded and / or beveled, so that with the axial movement in the direction of the bottle neck the sealing olive actually is pressed radially inwards and does not sit on the edge of the bottle neck or even radially is pushed outwards.

In analoger Weise hat in der bevorzugten Ausführungsform auch der Dichtungsstreifen an seinem freien Ende eine abgerundete und/oder abgeschrägte Form, so daß er beim axialen Bewegen in Richtung auf den Flaschenhals radial nach außen aufgespreizt wird, wenn er mit dem Flaschenhalsrand in Eingriff kommt.In an analogous manner, the sealing strip is also on in the preferred embodiment its free end has a rounded and / or beveled shape so that it is axial Moving radially outward towards the bottle neck when it is spreading the neck of the bottle comes into engagement.

insgesamt lassen sich die bevcrzugten Varianten von Dichtungsstreifen und Dichtolive dahingehend charakterisieren, daß ihre Abweichungen von einer exakten Hohlzylinderform im wesentlichen auf die Außenwand des Ansatzes und auf die Innnenwand des Dichtungsstreifens beschränkt sind. Dabei ist die Olive in der bevorzugten Ausführungsform etwa doppelt so dick und um mindestens 50% länger (in axialer Richtung) als der Dichtungsstreifen. Vorzugsweise beträgt die axiale Länge der Dichtolive sogar etwa das Doppelte der axialen Länge des Dichtungsstreifens. Aufgrund dieser relativ massiven Ausgestaltung der Dichtolive ist in der Ausführungsform der Erfindung gemäß Anspruch 1 die Abweichung des Außendurchmessers der Dichtolive von dem Durchmesser des Flaschenhalsrandes, jedenfalls in dem Bereich, wo die Abdichtung im wesentlichen auftritt, geringer als die entsprechende Abweichung des Innendurchmessers des Dichtungsstreifens von dem Außendurchmesser des Flaschenhalsrandes, da der Dichtungsstreifen dünner und kürzer und damit leichter elastisch dehnbar und wegbewegbar ist.Overall, the preferred variants of sealing strips and sealing olive Characterize in that their deviations from an exact hollow cylindrical shape in essentially on the outer wall of the approach and on the inner wall of the weather strip are limited. The olive in the preferred embodiment is approximately twice as thick and at least 50% longer (in the axial direction) than the sealing strip. The axial length of the sealing olive is preferably approximately twice the axial length Length of the weather strip. Because of this relatively massive design of the sealing olive is in the embodiment of the invention according to claim 1, the deviation of the outer diameter the sealing olive of the diameter of the bottle neck edge, at least in the Area where the seal essentially occurs is less than the corresponding deviation of the inner diameter of the sealing strip from the outer diameter of the Bottleneck edge, because the sealing strip is thinner and shorter and therefore more elastic is stretchable and movable away.

Vorzugsweise verlaufen die Außenflächen der Dichtolive und die Innenfläche des Dichtungsstreifens über die axiale Erstreckung des Dichtungsstreifens hinweg im wesentlichen parallel, d.h. man hat über die Länge des Dichtungsstreifens hinweg eine in etwa konstante lichte Weite zwischen Dichtolive und Dichtungsstreifen, und die Außenfläche der Dichtotive verläuft dabei vor allem in der axialen Höhe des Endes des Dichtungsstreifens parallel zu der abgeschrägten und abgerundeten Form desselben. Im Querschnitt hat also der zwischen Dichtolive und Dichtungsstreifen gebildete Hohlraum eine schmale, leicht konkäv gekrümmte und oben abgerundete Gestalt, ist an seinem unteren Ende offen und oben geschlossen. Der sich von unten nach oben leicht geschwungen erstreckende Hohlraum hat dabei im Querschnitt eine im wesentlichen konstante Breite und verjüngt sich nur an seinem oberen geschlossenen und abgerundeten Ende, wobei der obere Abschnitt, bezogen auf die Verschlußachse, nahezu zylindrisch ist, und der untere Abschnit sich konisch nach außen aufwertet. Die axiale Länge des Hohlraumes, der deutlich schmaler ist als der zugehörige Flaschenhals dick ist, ist dabei durch die Länge des äußeren Dichtungsstreifens definiert, der seinerseits relativ kurz ist, so daß er im auf einen Flaschenhals aufgeschraubten Zustand so eben den äußeren, abgerundeten Flaschenhalsrand voilständig umfaßt. Hierdurch bleibt der schmale Hohlraum zwischen Dichtolive und Dichtungsstreifen axial entsprechend kurz, was den Herstellungsvorgang und auch die Ausgestaltung eines entsprechenden Spritzgießwerkzsuges erieichtert. Konkret hat dieser Hohlraum eine axiale Tiefe (entsprechend der axialen Länge des Dichtungsstreifens) von weniger als 4 mm, vorzugsweise von weniger als 3 mm und insbesondere etwa 2 bis 2,5 mm.The outer surfaces of the sealing olive and the inner surface of the sealing strip preferably run essentially parallel across the axial extent of the sealing strip, i.e. one has an approximately constant clearance over the length of the sealing strip Width between sealing olive and sealing strip, and the outer surface of the sealing motif runs doing so, especially in the axial height of the end of the sealing strip parallel to the beveled and rounded shape of the same. So in cross section it has between the sealing olive and sealing strips formed a narrow, slightly concave curved and above cavity rounded shape, is open at the bottom and closed at the top. The one from The cavity, which is slightly curved upwards, has a cross section essentially constant width and tapers only at its upper closed and rounded end, the upper section, relative to the closure axis, almost is cylindrical, and the lower section is tapered towards the outside. The axial length of the cavity, which is significantly narrower than the associated bottle neck, is included defined by the length of the outer weather strip, which in turn is relatively short, so that when screwed onto a bottle neck, it was just the outer, rounded one Bottleneck rim completely covered. This leaves the narrow cavity between Sealing olive and sealing strips axially correspondingly short, which means the manufacturing process and the design of a corresponding injection molding tool is also easy. Specifically this cavity has an axial depth (corresponding to the axial length of the weather strip) of less than 4 mm, preferably less than 3 mm and in particular about 2 to 2.5 mm.

Das freie Ende des Mantels des Schraubverschlusses ist vorzugsweise einstückig mit einem Garantie- und Abreißband versehen. Wie auch insgesamt der Verschluß in der bevorzugten Ausführungsform aus einem einzigen Stück aus einem homogenen Kunststoffmaterial in Spritzgußtechnik hergestellt ist. Die im wesentlichen zylindrischen Formen der Dichtolive und des Dichtungsstreifens und die kurze axiaie Länge desselben erlauben dabei ein relativ leichtes und einfaches Entformen und ein entsprechend einfach geformtes Herstellungswerkzeug.The free end of the jacket of the screw cap is preferably in one piece with one Guarantee and tear-off tape provided. As well as the overall closure in the preferred Embodiment from a single piece of a homogeneous plastic material in Injection molding technology is made. The essentially cylindrical shapes of the sealing olive and of the sealing strip and the short axiaie length of the same allow a relatively light and simple demolding and a correspondingly simply shaped manufacturing tool.

Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der vorliegenden Erfindung werden deutlich anhand der folgenden Beschreibung einer bevorzugten Ausführungsform und der dazugehörigen Figuren. Es zeigen:

Figur 1a
den erfindungsgemäßen Schraubverschluß in einer die Achse enthaltenden, vergrößerten Schnittdarstellung,
Figur 1b
den Schraubverschluß nach Figur 1a in einer Seitenansicht, etwa in Originalgröße und
Figur 2
den Verschluß nach Figur 1 in derselben axialen Schnittebene, jedoch in einem auf einen Flaschenhals aufgeschraubten Zustand.
Further advantages, features and possible uses of the present invention will become clear from the following description of a preferred embodiment and the associated figures. Show it:
Figure 1a
the screw closure according to the invention in an enlarged sectional view containing the axis,
Figure 1b
the screw cap of Figure 1a in a side view, about the original size and
Figure 2
the closure of Figure 1 in the same axial sectional plane, but in a screwed on a bottle neck.

Man erkennt in Figur 1a den erfindungsgemäßen Schraubverschluß in einem die Achse enthaltenden Längsschnitt. Der Schraubverschluß besteht im wesentlichen aus einem zylindrischen Mantel 1 mit einer einstückig daran anschließenden, in etwa kreisscheibenförmigen Kopfplatte 2. Am freien Ende des zylindrischen Mantels 1 setzt noch, ebenfalls einstückig, mit dem Mantel 1, ein Garantie- und Abreißband 7 an, welches durch Losdrehen der Schraubkappe von einer Flasche aufreißt oder von dem Mantel 1 abreißt und damit eine bereits geöffnete Flasche kennzeichnet. The screw closure according to the invention can be seen in FIG. 1 a in the axis containing longitudinal section. The screw cap essentially consists of a cylindrical one Sheath 1 with an integral, approximately circular disk-shaped Head plate 2. At the free end of the cylindrical jacket 1 is also, also in one piece, with the jacket 1, a guarantee and tear tape 7, which by unscrewing the screw cap tears open from a bottle or tears from the jacket 1 and thus an already open one Features bottle.

Der zylindrische Mantel 1 hat ein stückweise unterbrochenes Innengewinde 8 sowie auf seiner Außenseite eine Griffriffelung 9, weiche das Aufbringen von Drehmoment beim Ergreifen der Verschlußkappe mir den Fingern erleichtern soll.The cylindrical jacket 1 has a partially interrupted internal thread 8 and on it The outside is a handle corrugation 9, the application of torque when gripping the soft Closure cap should ease my fingers.

Die beiden, die Dichtung mit dem Flaschenhals bewirkenden Elemente sind der ringförmig umlaufende, zylindrische Dichtungsstreifen 4 und die ebenfalls ringförmig und parallel hierzu umlaufende Dichtolive 3. Wie man erkennt, verläuft die Außenwand des zylindrischen Dichtungsstreifens 4 ebenso wie die Innenwand der zylindrischen Dichtolive 3 im Schnitt gerade und damit ziemlich exakt zylindrisch. Die Innenwand des zylindrischen Dichtungsstreifens 4 verläuft nur über einen relativ kurzen Abschnitt achsparallel und ist dann in Richtung des freien Endes abgerundet und schräg nach außen vertaufend. Die Außenwand der zylindrischen "Olive" 3 weist einen im Querschnitt flachen Wulst in etwa in Form eines stumpfwinkligen Dreiecks auf, wobei die stumpfe Spitze dieses stumpfwinkligen Dreiecks den maximalen Außendurchmesser des Ansatzes 3 bzw. des Wulstes definiert und axial in etwa mit dem freien Ende des Dichtungsstreifens 4 zusammenfällt. Zur Kopfplatte 2 hin verläuft dann die Außenwand der zylindrischen Dichtolive 3, ausgehend von dem Wulst näherungsweise parallel zu dem schräg und abgerundet verlaufenden Endabschnitt, bevor sie wieder näherungsweise achsparallel verläuft und dann in einem Bogen in die Innenwand des Dichtungsstreifens 4 übergeht.The two elements which effect the seal with the bottle neck are the ring-shaped circumferential, cylindrical sealing strips 4 and also ring-shaped and parallel to it circumferential sealing olive 3. As can be seen, the outer wall of the cylindrical runs Sealing strip 4 as well as the inner wall of the cylindrical sealing olive 3 in section straight and therefore pretty exactly cylindrical. The inner wall of the cylindrical weather strip 4 runs axially parallel only over a relatively short section and is then in Rounded in the direction of the free end and sloping towards the outside. The outer wall of the cylindrical "olive" 3 has a bead with a flat cross section in the shape of a obtuse-angled triangle, the obtuse tip of this obtuse-angled triangle maximum outer diameter of the neck 3 or the bead defined and axially approximately coincides with the free end of the weather strip 4. Runs towards the head plate 2 then the outer wall of the cylindrical sealing olive 3, starting from the bead approximately parallel to the sloping and rounded end section before again runs approximately axially parallel and then in an arc in the inner wall of the weather strip 4 passes.

In Figur 1b ist der Verschluß in etwa in natürlicher Größe in einer Seitenansicht dargestellt. Man erkennt deutlich die Riffelung 9 auf der Außenseite der Schraubkappe, die das Auf- und Zuschrauben des Verschlusses erleichtern soll, sowie das untere Garantie- und Abreißband 7. Im übrigen ist der Verschluß in den Figuren 1 und 2 exakt maßstabsgetreu dargestellt, wobei das Maß Ra etwas weniger als 31 mm beträgt. Hieraus lassen sich wegen der maßstabgetreuen Darstellung auch alle anderen Maße exakt ableiten und die absoluten und relativen Maße sämtlicher Elemente sind aufgrund der maßstabgetreuen Darstellung durch die Figuren offenbart. Es versteht sich jedoch, daß die Erfindung nicht auf die Einhaltung der absoluten und relativen Maße der einzelnen Elemente der Verschlußkappe beschränkt ist.In Figure 1b the closure is shown approximately in natural size in a side view. One can clearly see the corrugation 9 on the outside of the screw cap, which should make it easier to screw on and screw on the closure, as well as the lower guarantee and tear-off tape 7. Otherwise, the closure is shown exactly to scale in FIGS. 1 and 2, the dimension R a is slightly less than 31 mm. Because of the true-to-scale representation, all other dimensions can also be derived from this, and the absolute and relative dimensions of all elements are disclosed by the figures due to the true-to-scale representation. It is understood, however, that the invention is not limited to compliance with the absolute and relative dimensions of the individual elements of the closure cap.

Auch das freie Ende der Dichtolive 3 ist deutlich abgerundet, so daß das freie Ende der Dichtolive 3, wenn es auf den Rand eines Flaschenhalses stößt, nach innen abgleitet und weggedrängt wird. In Figur 2 ist der Kunststoffschraubverschluß nochmals in derselben Schnittebene, jedoch in dem auf einen Flaschenhals fest aufgeschraubten Zustand zu erkennen. Wie man sieht, ist die Dichtolive 3 durch Ineingrifftreten ihres abgerundeten freien Endes mit der Stirnfläche des Flaschenhalses 10 nach innen weggedrängt, der Wulst liegt an der inneren, zylindrischen Fläche des Flaschenhalses an. Wie man erkennt, ist dabei die zylindrische Olive 3 nach innen weggedrückt und komprimiert, so daß sich eine entsprechende elastische Rückstellkraft ergibt, weiche einen festen Dichtungseingriff herstellt.The free end of the sealing olive 3 is significantly rounded, so that the free end of the Sealing olive 3, when it hits the edge of a bottle neck, slides inwards and is pushed away. In Figure 2, the plastic screw cap is again in the same Cutting plane, but recognizable in the state screwed onto a bottle neck. As can be seen, the sealing olive 3 is due to the engagement of its rounded free end with the end face of the bottle neck 10 pushed inwards, the bead lies against the inner cylindrical surface of the bottle neck. As you can see, it is cylindrical Olive 3 pushed inward and compressed so that there is a corresponding elastic restoring force results, which creates a tight sealing engagement.

Am oberen äußeren Rand des Flaschenhalses ergibt sich die Dichtung durch den Eingriff mit dem Dichtungsstreifen 4, der beim Ineingrifftreten seines freien, abgerundeten bzw, abgeschrägten Endes mit der Stirnseite des Flaschenhalses nach außen weggedrängt und dann zwischen der Außenfläche des Flaschenhalses und einem zylindrischen Wulst 5 eingeklemmt und durch den Wulst um den oberen äußeren Flaschenrand herumgezogen wird, wobei dieser Wulst 5 am Übergang zwischen Kappenmantel und Kopfplatte vorgesehen ist und eine im wesentlichen zylindrische Innenfläche aufweist. Wegen der Einzelheiten des hierdurch erzielten, guten Dichtungseingriffes wird auf die DE 41 28 474 verwiesen. Da die Dichtolive 3 deutlich dicker und vorzugsweise etwa doppelt so dick ausgebildet ist (ohne Berücksichtigung des Wulstes) wie der Dichtungsstreifen 4, ist in der bevorzugten Ausführungsform der Erfindung vorgesehen, daß der Außendurchmesser 2R1 der Dichtolive, in dem Bereich, in welchem sie mit dem oberen Flaschenhalsrand in Eingriff tritt, einen kleineren Unterschied zum Innendurchmesser d des Flaschenhalsrandes in diesem Bereich aufweist als der Dichtungsstreifen 4 mit seiner Innenfläche relativ zu dem Außenrand des Flaschenhalses, da der Dichtungsstreifen 4 bei gleicher Krafteinwirkung leichter verformbar ist als die Dichtolive 3. Dies kann man auch in Figur 2 und durch den Vergleich mit Figur 1 deutlich erkennen. Der Durchmesserunterschied |d - 2R1| zwischen Dichtolive und innerem Flaschenhalsrand bei dem nicht auf einen Flaschenhals aufgeschraubten Verschluß beträgt nur etwa ein Drittel bis ein Viertel des Durchmesserunterschiedes D - 2r2 zwischen der Innenfläche des Dichtungsstreifens und dem äußeren Flaschenhalsrand.At the upper outer edge of the bottle neck, the seal results from the engagement with the sealing strip 4, which, when its free, rounded or beveled end comes into engagement, is pushed outward with the end face of the bottle neck and then clamped between the outer surface of the bottle neck and a cylindrical bead 5 and is pulled through the bead around the upper outer edge of the bottle, this bead 5 being provided at the transition between the cap jacket and the top plate and having a substantially cylindrical inner surface. Because of the details of the good sealing engagement achieved thereby, reference is made to DE 41 28 474. Since the sealing olive 3 is significantly thicker and preferably about twice as thick (without considering the bead) as the sealing strip 4, it is provided in the preferred embodiment of the invention that the outer diameter 2R 1 of the sealing olive, in the area in which it is engages the upper edge of the bottle neck, has a smaller difference to the inner diameter d of the bottle neck edge in this area than the sealing strip 4 with its inner surface relative to the outer edge of the bottle neck, since the sealing strip 4 is more easily deformable than the sealing olive 3 with the same force can also be clearly seen in Figure 2 and by comparison with Figure 1. The diameter difference | d - 2R 1 | between the sealing olive and the inner edge of the bottle neck when the closure is not screwed onto a bottle neck is only about a third to a quarter of the difference in diameter D - 2r 2 between the inner surface of the sealing strip and the outer edge of the bottle neck.

Durch den erfindungsgemäßen Verschluß wird erreicht, daß sowohl die obere äußere Kante als auch die Innenfläche der Flaschenhalsmündung zwischen zwei gegenüberliegenden Dichtungselementen eingefaßt und abgedichtet wird. Man hat damit zwei nahezu gleichwertige und voneinander unabhängige Dichtungen, so daß im Falle von unbemerkt bleibenden Beschädigungen, Verformungen oder Toleranzabweichungen des oberen Flaschenhalsrandes die Wahrscheinlichkeit, daß zumindest eine der beiden Dichtungen eine hinreichende Abdichtung gewährleistet, relativ groß ist, da es unwahrscheinlich ist, daß eine Beschädigung oder Verformung, die sowohl die obere Außenkante als auch die obere Innenfläche des Flaschenhalsrandes erfaßt, unbemerkt bleibt.The closure according to the invention ensures that both the upper outer edge as well as the inner surface of the bottle neck between two opposite Sealing elements are bordered and sealed. You have two almost equivalent and independent seals, so that in the case of unnoticed Damage, deformation or tolerance deviations of the upper edge of the bottle neck the likelihood that at least one of the two seals will provide an adequate seal guaranteed to be relatively large since it is unlikely to be damaged or deformation that affects both the upper outer edge and the upper inner surface of the Bottleneck edge captured, remains unnoticed.

Außerdem übt der Flaschenhals auf die beiden Dichtungselemente radial entgegengesetzte Kräfte aus, die sich weitgehend aufheben. Hierdurch vermeidet man, daß die bei herkömmlichen einseitig anliegenden Dichtungen diese Kräfte aufnehmende Kopfplatte (oder Kappenboden) diesen Kräften durch langsames Fließen nachgibt und damit den Dichtungseingriff allmählich schwächer macht.In addition, the bottle neck exerts radially opposite on the two sealing elements Forces that largely cancel each other out. This avoids that the conventional gaskets on one side that absorb these forces (or cap base) yields to these forces through slow flow and thus the sealing engagement gradually weakens.

Claims (12)

  1. A plastics screw closure for bottles, comprising a cap having a substantially cylindrical peripheral wall portion (1) with a female screwthread (8) for screwing on to the male screwthread (11) of a bottle neck (10), and a head plate portion (2) substantially in the form of a circular disc, and a substantially cylindrical sealing strip (4) which extends axially from the inside of the head plate portion (2) and whose outside diameter corresponds to the outside diameter of the bottle neck or is slightly larger than same and whose inside diameter (2R2) is markedly smaller than the outside diameter (D) of the bottle neck, wherein provided radially outside the sealing strip (4) at the transition from the head plate portion (2) to the peripheral wall portion (1) of the closure is a bead (5) having a substantially cylindrical inside surface whose inside diameter is at most equal to and preferably somewhat smaller than the sum of the diameter (D) of the bottle neck and double the diameter of the sealing strip (4), characterised in that provided radially inside the cylindrical sealing strip (4) is a sealing olive (3) which comprises a further, substantially cylindrical sealing strip of substantially olive-shaped cross-section and whose outside diameter (2R1) at least in the region near the head plate portion and opposite the sealing strip (4) is larger than the inside diameter (d) of the bottle neck (10), for which the closure is provided, and that the deviation (|2R1 - dl) of the outside diameter (2R1) of the sealing olive (3) from the inside diameter (d) of the bottle neck is markedly less than the deviation (|2r2 - Dl) of the inside diameter (2r2) of the sealing strip (4) from the outside diameter (D) of the bottle neck.
  2. A plastics screw closure according to claim 1 characterised in that the internal spacing (r2 - R1) between the sealing strip (4) and the sealing olive (3) in the sealing region is less than two thirds and optionally less than half the thickness of the bottle neck (10).
  3. A plastics screw closure according to claim 1 or claim 2 characterised in that on its outside the sealing olive (3) has a shallow bead (6) of the cross-section of an obtuse-angled triangle.
  4. A plastics screw closure according to one of claims 1 to 3 characterised in that at its free end the sealing olive (3) extends in a rounded-off and/or bevelled cross-sectional configuration such that upon axial movement on to a bottle neck (10) the sealing olive (3) is displaced radially inwardly.
  5. A plastics screw closure according to one of claims 1 to 4 characterised in that at its free end the sealing strip (4) is of a rounded-off and/or bevelled configuration such that upon axial movement of the closure on to the bottle neck the sealing strip is spread radially outwardly.
  6. A plastics screw closure according to one of claims 1 to 5 characterised in that deviations from the hollow-cylindrical shape of the sealing olive (3) and the sealing strip (4) are essentially limited to the outside wall of the sealing olive (3) and the inside wall of the sealing strip (4).
  7. A plastics screw closure according to one of claims 1 to 6 characterised in that the mutually facing surfaces of the sealing strip (4) and the sealing olive (3) extend parallel over the major part of the axial length of the sealing strip (4).
  8. A plastics screw closure according to one of claims 1 to 7 characterised in that the axial length of the sealing olive (3) is greater than the axial length of the sealing strip by at least 50% and preferably by about 100%.
  9. A plastics screw closure according to one of claims 1 to 8 characterised in that the mean thickness of the sealing olive (3) is approximately double the thickness of the sealing strip (4).
  10. A plastics screw closure according to one of claims 1 to 9 characterised in that the ratio of the deviations as defined in claim 1 is at least 1:2 and preferably 1:3 to 1:5.
  11. A plastics screw closure according to one of claims 1 to 10 characterised in that the lower edge of the peripheral wall portion (1) is provided with an anti-tamper and tear-off strip (7).
  12. A plastics screw closure according to one of claims 1 to 11 characterised in that it is produced in one piece and preferably from a homogeneous material.
EP98909299A 1997-02-14 1998-01-29 Pet-bottle with a plastic screw top Expired - Lifetime EP0960054B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19705717 1997-02-14
DE19705717A DE19705717A1 (en) 1997-02-14 1997-02-14 Plastic screw cap
PCT/DE1998/000266 WO1998035881A1 (en) 1997-02-14 1998-01-29 Plastic screw top

Publications (3)

Publication Number Publication Date
EP0960054A1 EP0960054A1 (en) 1999-12-01
EP0960054B1 true EP0960054B1 (en) 2001-10-04
EP0960054B2 EP0960054B2 (en) 2005-05-04

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Application Number Title Priority Date Filing Date
EP98909299A Expired - Lifetime EP0960054B2 (en) 1997-02-14 1998-01-29 Pet-bottle with a plastic screw top

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US (1) US6325226B1 (en)
EP (1) EP0960054B2 (en)
JP (1) JP2001511744A (en)
CN (1) CN1166532C (en)
AT (1) ATE206379T1 (en)
AU (1) AU724859B2 (en)
BR (1) BR9807364A (en)
CA (1) CA2281705C (en)
CZ (1) CZ291781B6 (en)
DE (3) DE19705717A1 (en)
ES (1) ES2162423T5 (en)
HU (1) HUP0000612A3 (en)
PL (1) PL189578B1 (en)
RO (1) RO117781B1 (en)
RU (1) RU2182877C2 (en)
TR (1) TR199901960T2 (en)
UA (1) UA42884C2 (en)
WO (1) WO1998035881A1 (en)

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US6325226B1 (en) 2001-12-04
CZ9902846A3 (en) 2001-02-14
HUP0000612A3 (en) 2000-10-30
JP2001511744A (en) 2001-08-14
TR199901960T2 (en) 1999-12-21
HUP0000612A2 (en) 2000-07-28
RU2182877C2 (en) 2002-05-27
UA42884C2 (en) 2001-11-15
CN1166532C (en) 2004-09-15
WO1998035881A1 (en) 1998-08-20
AU724859B2 (en) 2000-10-05
CA2281705A1 (en) 1998-08-20
EP0960054B2 (en) 2005-05-04
EP0960054A1 (en) 1999-12-01
CN1251073A (en) 2000-04-19
ES2162423T3 (en) 2001-12-16
ES2162423T5 (en) 2005-09-01
DE59801631D1 (en) 2001-11-08
RO117781B1 (en) 2002-07-30
DE19705717A1 (en) 1998-08-20
PL335256A1 (en) 2000-04-10
PL189578B1 (en) 2005-08-31
AU6390798A (en) 1998-09-08
DE19880115D2 (en) 2000-01-27
CZ291781B6 (en) 2003-05-14
ATE206379T1 (en) 2001-10-15
BR9807364A (en) 2000-03-14
CA2281705C (en) 2008-04-01

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