EP0960054A1 - Plastic screw top - Google Patents

Plastic screw top

Info

Publication number
EP0960054A1
EP0960054A1 EP98909299A EP98909299A EP0960054A1 EP 0960054 A1 EP0960054 A1 EP 0960054A1 EP 98909299 A EP98909299 A EP 98909299A EP 98909299 A EP98909299 A EP 98909299A EP 0960054 A1 EP0960054 A1 EP 0960054A1
Authority
EP
European Patent Office
Prior art keywords
sealing
bottle neck
sealing strip
plastic screw
olive
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
EP98909299A
Other languages
German (de)
French (fr)
Other versions
EP0960054B2 (en
EP0960054B1 (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
Original Assignee
Bericap GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
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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
Application granted granted Critical
Publication of EP0960054B1 publication Critical patent/EP0960054B1/en
Publication of EP0960054B2 publication Critical patent/EP0960054B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 a substantially cylindrical jacket with an internal thread for screwing onto the external thread of a bottle neck, and with a substantially circular disc-shaped head plate and a substantially cylindrical head extending axially inwards from the inside of the head plate Sealing strip, the outer diameter of which corresponds approximately to the outer bottle neck diameter or is slightly larger and the inner diameter of which is clearly smaller than the outer edge of the bottle neck.
  • the known plastic screw cap is intended for screwing onto the threaded neck of bottles and is designed so that the approximately cylindrical sealing strip lies on the top and outside of the bottle neck edge and thereby essentially along the upper outer, rounded edge of the bottle neck or the mouth of the bottle fits tightly.
  • the sealing strip is additionally clamped between an outer, approximately cylindrical bead and the bottle neck and pulled and pressed in firm sealing engagement with the edge of the bottle neck.
  • such a closure would also be for plastic tabs, e.g. PET bottles, usable.
  • closure cap has already become known which is intended to ensure a particularly good sealing engagement.
  • this known closure cap instead of an approximately cylindrical sealing strip, this known closure cap, however, has an approximately horizontally extending sealing strip which lies on the upper edge of the bottle neck, additional annular projections being provided on the bottom or the top plate of the closure cap, on the side opposite the edge of the bottle neck of the sealing strip engage with it and should exert a linear sealing pressure on the sealing strip.
  • an inner, approximately cylindrical sealing olive is provided, the term "olive" vividly describing the lower cross-section of this part, which has an outwardly projecting area which is also intended to engage approximately linearly with the cylindrical inner surface of the bottle neck.
  • the inner surface of a bottle neck is generally fairly precisely defined, at least in the case of PET bottles, but it may well be damaged, so that the projection of the sealing olive, despite its essentially linear engagement with the inside of the bottle neck, cannot guarantee a secure seal.
  • the sealing projection in the known closure is also provided at a considerable distance from the attachment of the sealing lamella to the head plate, so that there are no very high elastic restoring or pressing forces in the region of the projection.
  • An essentially radially extending sealing lamella partly covers the outer, generally well-defined, rounded bottle neck edge, which, however, can also be damaged, but, like the sealing olive, does not cover the inner, slightly rounded edge of the bottle neck edge.
  • These parts which are positioned differently with respect to the axis of the closure, define a blind hole-like depression with considerable undercut, which causes considerable problems during the production and in the necessary pressing out of air.
  • the known closures therefore have, at least in part, problems during manufacture and in particular during demolding and, on the other hand, do not yet provide an absolutely secure seal in the event of minor damage or deformation of the edge of the bottle neck.
  • the present invention has for its object to provide a plastic screw cap with the features mentioned, which prevents leaks even better in the event of slight damage or deformation of the edge of the bottle neck and which should also be easy to remove from the mold if possible to To facilitate manufacture with an injection mold that is as simple as possible.
  • the plastic screw closure has the further features that a further, essentially cylindrical sealing olive is provided radially inside the cylindrical sealing strip, the outside diameter of which is at least in the area near the head plate and opposite the sealing strip is larger than the inside diameter of a bottle neck for which the closure is intended.
  • an inner sealing olive is additionally provided which additionally seals the inner surface at the upper edge of the bottle neck .
  • This sealing olive also has a larger outer diameter than in the area near the head plate and opposite the sealing strip, ie in the area in which the upper edges of the bottle neck normally also lie when the cap is screwed onto a bottle it corresponds to 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 inside surface of the bottle neck edge.
  • the clear distance between the sealing strip and the sealing olive must be smaller than the thickness of the Bottle edge corresponds.
  • An embodiment of the invention is particularly preferred in which the clear distance between the sealing strip and sealing olive in the sealing region is less than two thirds, possibly even less than half the thickness of the bottle neck. Since the sealing olive as well as the sealing strip preferably consist of the plastic material of the closure, they have sufficient elasticity to be pushed away by the edge of the bottle neck when the closure is put on or screwed on, but due to the elastic restoring forces that occur in very firm, sealing engagement the top of the bottle neck.
  • the sealing olive has a flat bead on its outside, which in cross section has approximately the shape of an obtuse-angled triangle.
  • the sealing olive is preferably rounded and / or beveled, so that during the axial movement in the direction of the bottle neck the sealing olive is actually pressed radially inwards and is not seated on the edge of the neck or is even pushed radially outwards.
  • the sealing strip also has a rounded and / or beveled shape at its free end, so that it is spread radially outward when it moves axially towards the bottle neck when it comes into engagement with the bottle neck edge.
  • sealing strips and sealing olive can be characterized in that their deviations from an exact hollow cylinder shape in are essentially limited to the outer wall of the approach and to the inner wall of the weather strip.
  • the olive is about 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 even approximately twice the axial length of the sealing strip.
  • the deviation of the outside diameter of the sealing olive from 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 inside diameter of the sealing strip from the outside diameter of the bottleneck rim, since the sealing strip is thinner and shorter and therefore more easily stretchable and movable away.
  • the outer surfaces of the sealing olive and the inner surface of the weather strip are substantially parallel across the axial extent of the weather strip, i.e. one has an approximately constant clear width between the sealing olive and sealing strip over the length of the sealing strip, and the outer surface of the sealing olive runs parallel to the beveled and rounded shape of the same, especially at the axial height of the end of the sealing strip.
  • the cavity formed between the sealing olive and the sealing strip has a narrow, slightly concave curvature and is rounded at the top, is open at its lower end and closed at the top.
  • the cavity which is slightly curved from bottom to top, has a substantially constant width in cross section and tapers only at its upper closed and rounded end, the upper section being almost cylindrical with respect to the closure axis, and the lower section flared outwards.
  • the axial length of the cavity which is significantly narrower than the associated bottle shark is thick, is defined by the length of the outer sealing strip, which in turn is relatively short, so that when screwed onto a bottle neck, it just completely completes the rounded bottle neck edge includes.
  • this cavity has an axial depth (corresponding to the axial length of the sealing 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 provided in one piece with a guarantee and tear-off tape.
  • the closure in the preferred embodiment is made in one piece from a homogeneous plastic material using injection molding technology.
  • the essentially cylindrical shapes of the sealing olive and Sealing strip and the short axial length of the same allow relatively easy and simple demolding and a correspondingly simply shaped production tool.
  • FIG. 1 a shows the screw cap according to the invention in an enlarged sectional view containing the axis
  • FIG. 1 b shows the screw cap according to FIG. 1 a in a side view, approximately in original size
  • FIG. 2 shows the cap according to FIG. 1 in the same axial sectional plane, but in one on a bottle neck screwed on condition.
  • the screw cap in a longitudinal section containing the axis.
  • the screw cap consists essentially of a cylindrical jacket 1 with an integrally connected, approximately circular disc-shaped head plate 2.
  • the cylindrical jacket 1 has a partially interrupted internal thread 8 and on the outside of a gripping 9, which should facilitate the application of torque when gripping the cap with your fingers.
  • the two elements which effect the seal with the bottle neck are the annular circumferential, cylindrical sealing strip 4 and the sealing olive 3, which is also circular and parallel to it.
  • the outer wall of the cylindrical sealing strip 4 like the inner wall of the cylindrical sealing olive 3, runs on average straight and therefore pretty exactly cylindrical.
  • the inner wall of the cylindrical sealing strip 4 runs axially parallel only over a relatively short section and is then rounded in the direction of the free end and extends obliquely outwards.
  • the outer wall of the cylindrical "olive" 3 has a cross-sectionally flat bead approximately in the form of an obtuse-angled triangle, the obtuse tip of this obtuse-angled triangle defining the maximum outer diameter of the attachment 3 or the bead and axially approximately with the free end of the weather strip 4 coincides.
  • the outer wall of the head plate 2 then runs cylindrical sealing olive 3, starting from the bead approximately parallel to the oblique and rounded end section before it again runs approximately axially parallel and then merges into the inner wall of the sealing strip 4.
  • 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 the closure on and off, as well as the lower guarantee and tear-off band 7.
  • the rest 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 also significantly rounded, so that the free end of the sealing olive 3, when it strikes the edge of a bottle neck, slides inwards and is pushed away.
  • the plastic screw cap can be seen again in the same sectional plane, but in the state firmly screwed onto a bottle neck.
  • the sealing olive 3 has been pushed inwards by the engagement of its rounded free end with the end face of the bottle neck 10, the bead lies against the inner, cylindrical surface of the bottle neck.
  • the cylindrical olive 3 is pushed inwards and compressed, so that there is a corresponding elastic restoring force, which produces 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 with the end face of the bottle neck is pushed outward and then clamped between the outer surface of the bottle neck and a cylindrical bead 5 and is drawn 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 the upper edge of the bottle neck engages, a smaller difference to the inner diameter d of the Bottleneck edge in this area has as 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 when the same force is applied. This can also be clearly seen in FIG. 2 and by comparison with FIG .
  • 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 and the inner surface of the bottle neck mouth are enclosed and sealed between two opposing sealing elements. You have two almost equivalent and independent seals, so that in the event of unnoticed damage, deformation or tolerance deviations of the upper edge of the bottle neck, the probability that at least one of the two seals ensures a sufficient seal is relatively large, since it is unlikely that a damage or deformation that covers both the upper outer edge and the upper inner surface of the bottle neck edge remains unnoticed.
  • the bottle neck exerts radially opposite forces on the two sealing elements, which largely cancel each other out. This prevents the head plate (or cap base) which absorbs these forces from conventional one-sided seals from yielding to these forces through slow flow and thus gradually weakens the sealing engagement.

Landscapes

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

Abstract

The invention relates to a plastic screw top for bottles, consisting of a cap with a substantially cylindrical casing (1), with an internal screw thread (8) for screwing onto the external screw thread (11) of a bottle neck (10), and with a substantially disk-like top plate, (2) and a substantially cylindrical sealing strip (4), extending axially from the inside of the top plate (2), and having an outside diameter approximately equal to the bottle neck outside diameter, or slightly larger, and having an inside diameter (2R2) clearly smaller than the bottle neck outside diameter (D). The invention seeks to create a plastic screw top having the above described properties, and which, in the case of slight damage or deformation of the bottle neck edge, prevents leakage in a more reliable manner, and which should furthermore, if possible, be slightly deformable. The invention also seeks to simplify its production with an injection moulding tool that is as simply built as possible. To this end, the invention proposes that 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 bigger than the inside diameter (d) of the bottle neck (10) for which the top is intended.

Description

Kunststoffschraubverschluß Plastic screw cap
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 Flaschenhaisrand.The present invention relates to a plastic screw cap for bottles, consisting of a substantially cylindrical jacket with an internal thread for screwing onto the external thread of a bottle neck, and with a substantially circular disc-shaped head plate and a substantially cylindrical head extending axially inwards from the inside of the head plate Sealing strip, the outer diameter of which corresponds approximately to the outer bottle neck diameter or is slightly larger and the inner diameter of which is clearly smaller than the outer edge of the bottle neck.
Ein derartiger Kunststoffschraubverschluß für Flaschen ist bereits aus der DE 41 28474 bekannt.Such a plastic screw cap for bottles is already known from DE 41 28474.
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 Fiaschenmündung dichtend anliegt. Dabei wird der Dichtungsstreifen zusätzlich noch zwischen einem äußeren, in etwa zylin- derförmigen Wulst und dem Flaschenhals eingeklemmt und in festen Dichtungseingriff mit dem Flaschenhalsrand gezogen und gedrückt. Grundsätzlich wäre ein solcher Verschluß auch für Kunststoff laschen, z.B. PET-Flaschen, verwendbar.The known plastic screw cap is intended for screwing onto the threaded neck of bottles and is designed so that the approximately cylindrical sealing strip lies on the top and outside of the bottle neck edge and thereby essentially along the upper outer, rounded edge of the bottle neck or the mouth of the bottle fits tightly. The sealing strip is additionally clamped between an outer, approximately cylindrical bead and the bottle neck and pulled and pressed in firm sealing engagement with the edge of the bottle neck. In principle, such a closure would also be for plastic tabs, 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 Kunststofflaschen, 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 Fiascheninnere 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 bottle necks and mouths, are visually inspected before being reused. However, it cannot be ruled out that damage to the edge of the bottle neck in the area where it comes into sealing engagement with the closure cap or sealing elements of the closure cap is overlooked, in particular if this damage is relatively small and unobtrusive. Basically, this also applies to plastic bottles, especially for PET bottles, which are becoming increasingly widespread. In the case of plastic bottles, it may also be possible to expect somewhat larger manufacturing tolerances or damage in the course of manufacture or handling. Small damage, especially in the form of small dents or marks, is difficult to see visually. So it can happen that bottles are filled and closed, the bottle neck edge of which shows slight damage, deformation or unevenness due to manufacture, which are easily overlooked during a check, but which are sufficient to impair the sealing engagement between the bottle neck edge and sealing elements of the cap. This applies in particular if the inside of the vial is under pressure, e.g. B. in the case of using the bottles for carbonated drinks. With such bottles, a poor seal can cause gas to escape from the bottle and thereby lower the pressure, which in turn leads to outgassing of the carbonic acid contained in the drink, which then has largely lost its carbonic acid after a few days or weeks of storage and accordingly scarf tastes good.
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 iinienförmig 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 Flascheπhalsinneren 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 intended to ensure a particularly good sealing engagement. Instead of an approximately cylindrical sealing strip, this known closure cap, however, has an approximately horizontally extending sealing strip which lies on the upper edge of the bottle neck, additional annular projections being provided on the bottom or the top plate of the closure cap, on the side opposite the edge of the bottle neck of the sealing strip engage with it and should exert a linear sealing pressure on the sealing strip. In addition, an inner, approximately cylindrical sealing olive is provided, the term "olive" vividly describing the lower cross-section of this part, which has an outwardly projecting area which is also intended to engage approximately linearly with the cylindrical inner surface of the bottle neck. The inner surface of a bottle neck is generally fairly precisely defined, at least in the case of PET bottles, but it may well be damaged, so that the projection of the sealing olive, despite its essentially linear engagement with the inside of the bottle neck, cannot guarantee a secure seal. The sealing projection in the known closure is also provided at a considerable distance from the attachment of the sealing lamella to the head plate, so that there are no very high elastic restoring or pressing forces in the region of the projection.
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 Fiaschenhalsrandes. 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 partly covers the outer, generally well-defined, rounded bottle neck edge, which, however, can also be damaged, but, like the sealing olive, does not cover the inner, slightly rounded edge of the bottle neck edge. These parts, which are positioned differently with respect to the axis of the closure, define a blind hole-like depression with considerable undercut, which causes considerable problems during the production and in the necessary pressing out of air.
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 Flaschenhal- ses. 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, in addition to an approximately conically outward-facing, circumferential sealing lamella, which is intended to engage the outer edge of the bottle neck, additionally has an inner centering projection, the outer diameter of which is, however, somewhat smaller than that Inside diameter of the bottle neck ses. This approach therefore does not come into sealing engagement with the interior of the bottle neck and in particular not with the upper inner bottle neck edge.
Wegen der konischen Form der Dichtungsiamelle 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 Dichtungsiamelle 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, the demolding of such a closure from an injection molding tool is relatively difficult and complex. This applies even more to the aforementioned closure according to WO 96/02430, in which the sealing lamella extends radially inward almost in one plane parallel to the head plate and, together with a sealing olive located further inside, defines an almost closed cavity.
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.The known closures therefore have, at least in part, problems during manufacture and in particular during demolding and, on the other hand, do not yet provide an absolutely secure seal in the event of minor damage or deformation of the edge of the bottle neck.
Gegenüber diesem Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen Kunststoffschraubverschluß mit den eingangs genannten Merkmalen zu schaffen, welcher im Falle von leichten Beschädigungen oder Verformungen des Flaschenhalsrandes 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 present invention has for its object to provide a plastic screw cap with the features mentioned, which prevents leaks even better in the event of slight damage or deformation of the edge of the bottle neck and which should also be easy to remove from the mold if possible to To facilitate manufacture with an injection mold that is as simple as possible.
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 zylindrische Dichtolive vorgesehen ist, deren 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.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 olive is provided radially inside the cylindrical sealing strip, the outside diameter of which is at least in the area near the head plate and opposite the sealing strip is larger than the inside diameter of a bottle neck for which the closure is intended.
Während der äußere Dichtungsstreifen, der in etwa so ausgestaltet ist, wie im Falle der bekannten DE 41 28474, 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 Flaschenhaisrandes 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 Flaschenhaisrandes 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 Dichtuπgsstreifen 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 sealing strip, which is configured approximately as in the case of the known DE 41 28474, thus achieves a very good seal of the upper outer bottle neck edge, an inner sealing olive is additionally provided which additionally seals the inner surface at the upper edge of the bottle neck . The latter is achieved in that this sealing olive also has a larger outer diameter than in the area near the head plate and opposite the sealing strip, ie in the area in which the upper edges of the bottle neck normally also lie when the cap is screwed onto a bottle it corresponds to 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 inside surface of the bottle neck edge. From the Diameter conditions for the sealing strip and the sealing olive result inevitably that in a given axial position, and in particular in the axial region 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 the thickness of the Bottle edge corresponds. An embodiment of the invention is particularly preferred in which the clear distance between the sealing strip and sealing olive in the sealing region is less than two thirds, possibly even less than half the thickness of the bottle neck. Since the sealing olive as well as the sealing strip preferably consist of the plastic material of the closure, they have sufficient elasticity to be pushed away by the edge of the bottle neck when the closure is put on or screwed on, but due to the elastic restoring forces that occur in very firm, sealing engagement the top of the bottle neck.
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 has a flat bead on its outside, which in cross section has approximately 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 of the inner shoulder inward is equivalent to a compression of the material from which the sealing olive is made. The bead, which has a correspondingly larger outer diameter, firstly comes into sealing engagement with the inner surface of the edge of the bottle neck and, moreover, forces a greater compression of the material from which the sealing olive is made, and thus an increase in the elastic restoring force, which ultimately ensures reliable sealing engagement .
An ihrem freien Ende ist die Dichtolive vorzugsweise abgerundet und/oder abgeschrägt, so daß bei der axialen Bewegung in Richtung des Flaschenhalses die Dichtolive auch tatsächlich radial nach innen gedrückt wird und nicht auf dem Fiaschenhalsrand aufsitzt oder gar radial nach außen weggedrängt wird.At its free end, the sealing olive is preferably rounded and / or beveled, so that during the axial movement in the direction of the bottle neck the sealing olive is actually pressed radially inwards and is not seated on the edge of the neck or is even pushed radially 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.Analogously, in the preferred embodiment, the sealing strip also has a rounded and / or beveled shape at its free end, so that it is spread radially outward when it moves axially towards the bottle neck when it comes into engagement with the bottle neck edge.
Insgesamt lassen sich die bevorzugten Varianten von Dichtungsstreifen und Dichtolive dahingehend charakterisieren, daß ihre Abweichungen von einer exakten Hohlzyiinderform 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 bevorzugten Ausführungsform der Erfindung 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 Flaschenhalsraπdes, da der Dichtungsstreifen dünner und kürzer und damit leichter elastisch dehnbar und wegbewegbar ist.Overall, the preferred variants of sealing strips and sealing olive can be characterized in that their deviations from an exact hollow cylinder shape in are essentially limited to the outer wall of the approach and to the inner wall of the weather strip. In the preferred embodiment, the olive is about 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 even approximately twice the axial length of the sealing strip. Because of this relatively massive configuration of the sealing olive, in the preferred embodiment of the invention the deviation of the outside diameter of the sealing olive from 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 inside diameter of the sealing strip from the outside diameter of the bottleneck rim, since the sealing strip is thinner and shorter and therefore more easily 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 Dichtuπgsstreifens hinweg eine in etwa konstante lichte Weite zwischen Dichtolive und Dichtuπgsstreifen, und die Außenfläche der Dichtolive 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 konkav 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 aufweitet. Die axiale Länge des Hohlraumes, der deutlich schmaler ist als der zugehörige Flaschenhais 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 vollständig umfaßt. Hierdurch bleibt der schmale Hohlraum zwischen Dichtolivθ und Dichtungsstreifen axial entsprechend kurz, was den Herstellungsvorgang and auch die Ausgestaltung eines entsprechenden Spritzgießwerkzeuges erleichtert. 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.Preferably, the outer surfaces of the sealing olive and the inner surface of the weather strip are substantially parallel across the axial extent of the weather strip, i.e. one has an approximately constant clear width between the sealing olive and sealing strip over the length of the sealing strip, and the outer surface of the sealing olive runs parallel to the beveled and rounded shape of the same, especially at the axial height of the end of the sealing strip. In cross section, the cavity formed between the sealing olive and the sealing strip has a narrow, slightly concave curvature and is rounded at the top, is open at its lower end and closed at the top. The cavity, which is slightly curved from bottom to top, has a substantially constant width in cross section and tapers only at its upper closed and rounded end, the upper section being almost cylindrical with respect to the closure axis, and the lower section flared outwards. The axial length of the cavity, which is significantly narrower than the associated bottle shark is thick, is defined by the length of the outer sealing strip, which in turn is relatively short, so that when screwed onto a bottle neck, it just completely completes the rounded bottle neck edge includes. As a result, the narrow cavity between the sealing olive and the sealing strip remains axially correspondingly short, which facilitates the manufacturing process and also the design of a corresponding injection molding tool. Specifically, this cavity has an axial depth (corresponding to the axial length of the sealing 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 axiale 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 provided in one piece with a guarantee and tear-off tape. Just as the closure in the preferred embodiment is made in one piece from a homogeneous plastic material using injection molding technology. The essentially cylindrical shapes of the sealing olive and Sealing strip and the short axial length of the same allow relatively easy and simple demolding and a correspondingly simply shaped production tool.
Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der vorliegenden Erfindung werden deutlich anhand der folgenden Beschreibung einer bevorzugten Ausführungsform und der dazugehörigen Figuren. Es zeigen: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:
Figur 1 a den erfindungsgemäßen Schraubverschluß in einer die Achse enthaltenden, vergrößerten Schnittdarstellung, Figur 1 b den Schraubverschluß nach Figur 1 a 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.1 a shows the screw cap according to the invention in an enlarged sectional view containing the axis, FIG. 1 b shows the screw cap according to FIG. 1 a in a side view, approximately in original size, and FIG. 2 shows the cap according to FIG. 1 in the same axial sectional plane, but in one on a bottle neck screwed on condition.
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.In Figure 1a you can see the screw cap according to the invention in a longitudinal section containing the axis. The screw cap consists essentially of a cylindrical jacket 1 with an integrally connected, approximately circular disc-shaped head plate 2. At the free end of the cylindrical jacket 1, also in one piece, with the jacket 1, there is a guarantee and tear-off tape 7, which by Unscrewing the screw cap tears open from a bottle or tears from the jacket 1 and thus identifies an already opened bottle.
Der zylindrische Mantel 1 hat ein stückweise unterbrochenes Innengewinde 8 sowie auf seiner Außenseite eine Griffriffelung 9, welche das Aufbringen von Drehmoment beim Ergreifen der Verschlußkappe mit den Fingern erleichtern soll.The cylindrical jacket 1 has a partially interrupted internal thread 8 and on the outside of a gripping 9, which should facilitate the application of torque when gripping the cap with your 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 verlaufend. Die Außenwand der zylindrischen "Olive" 3 weist einen im Querεc;.nitt 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 annular circumferential, cylindrical sealing strip 4 and the sealing olive 3, which is also circular and parallel to it. As can be seen, the outer wall of the cylindrical sealing strip 4, like the inner wall of the cylindrical sealing olive 3, runs on average straight and therefore pretty exactly cylindrical. The inner wall of the cylindrical sealing strip 4 runs axially parallel only over a relatively short section and is then rounded in the direction of the free end and extends obliquely outwards. The outer wall of the cylindrical "olive" 3 has a cross-sectionally flat bead approximately in the form of an obtuse-angled triangle, the obtuse tip of this obtuse-angled triangle defining the maximum outer diameter of the attachment 3 or the bead and axially approximately with the free end of the weather strip 4 coincides. The outer wall of the head plate 2 then runs cylindrical sealing olive 3, starting from the bead approximately parallel to the oblique and rounded end section before it again runs approximately axially parallel and then merges into the inner wall of the sealing strip 4.
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 the closure on and off, as well as the lower guarantee and tear-off band 7. The rest 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, welche einen festen Dichtuπgseingriff herstellt.The free end of the sealing olive 3 is also significantly rounded, so that the free end of the sealing olive 3, when it strikes the edge of a bottle neck, slides inwards and is pushed away. In Figure 2, the plastic screw cap can be seen again in the same sectional plane, but in the state firmly screwed onto a bottle neck. As can be seen, the sealing olive 3 has been pushed inwards by the engagement of its rounded free end with the end face of the bottle neck 10, the bead lies against the inner, cylindrical surface of the bottle neck. As can be seen, the cylindrical olive 3 is pushed inwards and compressed, so that there is a corresponding elastic restoring force, which produces 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 —i 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 Flaschenhaisrandes 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 with the end face of the bottle neck is pushed outward and then clamped between the outer surface of the bottle neck and a cylindrical bead 5 and is drawn 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 the upper edge of the bottle neck engages, a smaller difference to the inner diameter d of the Bottleneck edge in this area has as 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 when the same force is applied. This can also be clearly seen in FIG. 2 and by comparison with FIG . 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 and the inner surface of the bottle neck mouth are enclosed and sealed between two opposing sealing elements. You have two almost equivalent and independent seals, so that in the event of unnoticed damage, deformation or tolerance deviations of the upper edge of the bottle neck, the probability that at least one of the two seals ensures a sufficient seal is relatively large, since it is unlikely that a damage or deformation that covers both the upper outer edge and the upper inner surface of the bottle neck edge 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 forces on the two sealing elements, which largely cancel each other out. This prevents the head plate (or cap base) which absorbs these forces from conventional one-sided seals from yielding to these forces through slow flow and thus gradually weakens the sealing engagement.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Kunststoffschraubverschluß für Flaschen, bestehend aus einer Kappe mit einem im wesentlichen zylindrischen Mantel (1) mit Innengewinde (8) für das Aufschrauben auf das Außengewinde (11) eines Flaschenhalses (10), und mit einer im wesentlichen kreisscheibenförmigen Kopfplatte (2) sowie einem im wesentlichen zylindrischen und sich von der Innenseite der Kopfplatte (2) axial erstreckenden Dichtungsstreifen (4), dessen Außendurchmesser in etwa dem äußeren Flaschenhalsdurchmesser entspricht oder geringfügig größer ist und dessen Innendurchmesser (2R2) eindeutig kleiner ist als der äußere Flaschenhalsdurchmesser (D), dadurch gekennzeichnet, daß radial innerhalb des zylindrischen Dichtungsstreifens (4) ein weitere, im wesentlichen zylindrische Dichtolive (3) vorgesehen ist, deren Außendurchmesser (2R1) mindestens in dem nahe der Kopfplatte gelegenen und dem Dichtungsstreifen (4) gegenüberliegenden Bereich größer ist als der Innendurchmesser (d) des Flaschenhalses (10), für welchen der Verschluß vorgesehen ist.1. Plastic screw cap for bottles, consisting of a cap with a substantially cylindrical jacket (1) with an internal thread (8) for screwing onto the external thread (11) of a bottle neck (10), and with a substantially circular disc-shaped head plate (2) and an essentially cylindrical sealing strip (4) which extends axially from the inside of the head plate (2), the outside diameter of which corresponds approximately to or is slightly larger than the outside bottle neck diameter and the inside diameter (2R 2 ) of which is clearly smaller than the outside bottle neck diameter (D) , characterized in that a further, essentially cylindrical sealing olive (3) is provided radially inside the cylindrical sealing strip (4), the outside diameter (2R 1 ) of which is greater than at least in the area near the head plate and opposite the sealing strip (4) the inside diameter (d) of the bottle neck (10) , for which the closure is intended.
2. Kunststoffschraubverschluß nach Anspruch 1 , dadurch gekennzeichnet, daß der lichte Abstand (r2 - R^ zwischen dem Dichtungsstreifen (4) und der Dichtolive (3) in dem abdichtenden Bereich weniger als zwei Drittel und wahlweise weniger als die Hälfte der Dicke des Flaschenhalses (10) beträgt.2. Plastic screw cap according to claim 1, characterized in that the clear distance (r 2 - R ^ between the sealing strip (4) and the sealing olive (3) in the sealing area less than two thirds and optionally less than half the thickness of the bottle neck (10) is.
3. Kunststoffschraubverschluß nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dichtolive (3) auf ihrer Außenseite einen flachen Wulst (6) mit dem Querschnitt eines stumpfwinkligen Dreieckes aufweist.3. Plastic screw closure according to claim 1 or 2, characterized in that the sealing olive (3) has on its outside a flat bead (6) with the cross section of an obtuse-angled triangle.
4. Kunststoffschraubverschluß nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Dichtolive (3) an ihrem freien Ende im Querschnitt derart abgerundet und/oder abgeschrägt verläuft, daß beim axialen Bewegen auf einen Flaschenhals (10) die Dichtolive (3) radial nach innen gedrängt wird.4. Plastic screw cap according to one of claims 1 to 3, characterized in that the sealing olive (3) is rounded at its free end in cross section and / or bevelled such that the axial movement on a bottle neck (10), the sealing olive (3) radially is pushed inside.
5. Kunststoffschraubverschluß nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Dichtungsstreifen (4) an seinem freien Ende derart abgerundet und/oder abgeschrägt verläuft, daß er beim axialen Bewegen des Verschlusses auf den Flaschenhals radial nach außen aufgespreizt wird. 5. Plastic screw cap according to one of claims 1 to 4, characterized in that the sealing strip (4) at its free end is rounded and / or bevelled such that it is spread radially outwards when the closure is moved axially onto the bottle neck.
6. Kuπststoffschraubverschluß nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß Abweichungen von der Hohizylinderform der Dichtolive (3) und des Dichtungsstreifeπs (4) im wesentlichen auf die Außenwand der Dichtolive (3) und die Innenwand des Dichtungsstreifens (4) beschränkt sind.6. plastic screw closure according to one of claims 1 to 5, characterized in that deviations from the hollow cylindrical shape of the sealing olive (3) and the sealing strip (4) are essentially limited to the outer wall of the sealing olive (3) and the inner wall of the sealing strip (4) .
7. Kunststoffschraubverschluß nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß radial außerhalb des Dichtungsstreifens (4) am Übergang von der Kopfplatte (2) zu dem Mantel (1) des Verschlusses ein Wulst (5) mit einer in etwa zylindrischen Innenfläche vorgesehen ist, dessen Innendurchmesser höchstens gleich der und vorzugsweise etwas geringer als die Summe aus Flaschenhalsdurchmesser (D) und dem Zweifachen der Dicke des Dichtungsstreifens (4) ist.7. Plastic screw closure according to one of claims 1 to 6, characterized in that a bead (5) with an approximately cylindrical inner surface is provided radially outside of the sealing strip (4) at the transition from the top plate (2) to the jacket (1) of the closure whose inner diameter is at most equal to and preferably slightly less than the sum of the bottle neck diameter (D) and twice the thickness of the sealing strip (4).
8. Kunststoffschraubverschluß nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die einander zugewandten Flächen des Dichtungsstreifens (4) und der Dichtolive (3) über den größten Teil der axialen Länge des Dichtungsstreifens (4) parallel verlaufen.8. Plastic screw closure according to one of claims 1 to 7, characterized in that the mutually facing surfaces of the sealing strip (4) and the sealing olive (3) run parallel over most of the axial length of the sealing strip (4).
9. Kunststoffschraubverschluß nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die axiale Länge der Dichtolive (3) um mindestens 50%, vorzugsweise um etwa 100% größer ist als die axiale Länge des Dichtungsstreifens.9. Plastic screw closure according to one of claims 1 to 8, characterized in that the axial length of the sealing olive (3) by at least 50%, preferably by about 100% is greater than the axial length of the sealing strip.
10. Kunststoffschraubverschluß nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die mittlere Dicke der Dichtolive (3) etwa das Doppelte der Dicke des Dichtungsstreifens (4) beträgt.10. Plastic screw closure according to one of claims 1 to 9, characterized in that the average thickness of the sealing olive (3) is approximately twice the thickness of the sealing strip (4).
11. Kunststoffschraubverschluß nach Anspruch 10, dadurch gekennzeichnet, daß die Abweichung (|2R1 - d|) des Außendurchmessers (2R1) der Dichtolive (3) vom Innendurchmesser (d) des Flaschenhalses deutlich geringer ist als die Abweichung (|2r2 - D|) des Innendurchmessers (2r2) des Dichtungsstreifens (4) vom Außendurchmesser (D) des Flaschenhalses.11. Plastic screw cap according to claim 10, characterized in that the deviation (| 2R 1 - d |) of the outside diameter (2R 1 ) of the sealing olive (3) from the inside diameter (d) of the bottle neck is significantly less than the deviation (| 2r 2 - D |) of the inside diameter (2r 2 ) of the sealing strip (4) from the outside diameter (D) of the bottle neck.
12. Kunststoffschraubverschluß nach Anspruch 11 , dadurch gekennzeichnet, daß das Verhältnis der Abweichungen mindestens 1 :2, vorzugsweise 1 :3 bis 1 :5 beträgt. 12. Plastic screw closure according to claim 11, characterized in that the ratio of the deviations is at least 1: 2, preferably 1: 3 to 1: 5.
13. Kunststoffschraubverschluß nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß der untere Rand des Mantels (1) mit einem Garantie- und Abreißband (7) versehen ist.13. Plastic screw closure according to one of claims 1 to 12, characterized in that the lower edge of the casing (1) is provided with a guarantee and tear-off tape (7).
14. Kunststoffschraubverschluß nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, daß er einstückig und vorzugsweise aus einem homogenen Material hergestellt ist. 14. Plastic screw closure according to one of claims 1 to 13, characterized in that it is made 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
DE19705717A DE19705717A1 (en) 1997-02-14 1997-02-14 Plastic screw cap
DE19705717 1997-02-14
PCT/DE1998/000266 WO1998035881A1 (en) 1997-02-14 1998-01-29 Plastic screw top

Publications (3)

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

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Family Applications (1)

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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FR2828172A1 (en) * 2001-07-31 2003-02-07 Rical Sa Bottle cap for carbonated drinks has gas and liquid-proof seal under transverse wall inside inner sealing skirt
WO2014060893A1 (en) 2012-10-18 2014-04-24 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa A cap for containers

Also Published As

Publication number Publication date
RO117781B1 (en) 2002-07-30
TR199901960T2 (en) 1999-12-21
AU6390798A (en) 1998-09-08
WO1998035881A1 (en) 1998-08-20
JP2001511744A (en) 2001-08-14
AU724859B2 (en) 2000-10-05
EP0960054B2 (en) 2005-05-04
CN1251073A (en) 2000-04-19
ES2162423T3 (en) 2001-12-16
DE19880115D2 (en) 2000-01-27
PL335256A1 (en) 2000-04-10
ES2162423T5 (en) 2005-09-01
HUP0000612A3 (en) 2000-10-30
BR9807364A (en) 2000-03-14
CZ291781B6 (en) 2003-05-14
CA2281705C (en) 2008-04-01
UA42884C2 (en) 2001-11-15
DE59801631D1 (en) 2001-11-08
HUP0000612A2 (en) 2000-07-28
DE19705717A1 (en) 1998-08-20
EP0960054B1 (en) 2001-10-04
CN1166532C (en) 2004-09-15
US6325226B1 (en) 2001-12-04
CA2281705A1 (en) 1998-08-20
ATE206379T1 (en) 2001-10-15
PL189578B1 (en) 2005-08-31
RU2182877C2 (en) 2002-05-27
CZ9902846A3 (en) 2001-02-14

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